[1136] | 1 | #ifndef lint |
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| 2 | static char rcsid[] = "$Header: /afs/dev.mit.edu/source/repository/athena/bin/xmore/ScrollByLine.c,v 1.1 1988-05-24 14:04:40 kit Exp $"; |
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| 3 | #endif lint |
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| 4 | |
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| 5 | /* |
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| 6 | * ScrollByLine.c - This creates a widget the will text to |
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| 7 | * be scrolled vertically. |
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| 8 | * |
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| 9 | * Author: Chris Peterson |
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| 10 | * M. I. T. Project Athena. |
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| 11 | * Cambridge, Mass. |
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| 12 | * Date: 12/5/87 |
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| 13 | * |
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| 14 | */ |
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| 15 | |
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| 16 | /* |
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| 17 | * I wrote this widget before I knew what form did, and it shows, since |
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| 18 | * the "right" way to do this widget would be to subclass it to form, |
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| 19 | * and do it much more like the Viewport widget in the Athena widget set. |
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| 20 | * But this works and time is short, so here it is. |
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| 21 | * |
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| 22 | * Chris Peterson 1/30/88 |
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| 23 | */ |
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| 24 | |
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| 25 | /* |
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| 26 | * There is a horizontal scrollbar somewhat coded into this widget, the |
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| 27 | * layout function should be fine with the current horizontal code, (RIGHT!) |
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| 28 | * |
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| 29 | * But I didn't really sit down and figure out what horizontal scrolling meant |
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| 30 | * for this widget, as it displays the stuff by line. |
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| 31 | * |
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| 32 | * Any brilliant Ideas? |
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| 33 | */ |
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| 34 | |
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| 35 | #include <X11/IntrinsicP.h> |
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| 36 | #include "ScrollByLine.h" |
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| 37 | #include "ScrollByLineP.h" |
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| 38 | #include <X11/Scroll.h> |
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| 39 | #include <X11/Atoms.h> |
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| 40 | #include <X11/Misc.h> |
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| 41 | |
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| 42 | /* Default Translation Table */ |
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| 43 | |
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| 44 | static char defaultTranslations[] = |
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| 45 | "<Btn1Down>: Page(Forward) \n\ |
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| 46 | <Btn3Down>: Page(Back) \n\ |
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| 47 | <Key>f: Page(Forward) \n\ |
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| 48 | <Key>b: Page(Back) \n\ |
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| 49 | <Key>\\ : Page(Forward)"; |
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| 50 | |
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| 51 | |
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| 52 | /**************************************************************** |
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| 53 | * |
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| 54 | * ScrollByLine Resources |
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| 55 | * |
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| 56 | ****************************************************************/ |
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| 57 | |
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| 58 | static XtResource resources[] = { |
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| 59 | {XtNforeground, XtCForeground, XtRPixel, sizeof(Pixel), |
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| 60 | XtOffset(ScrollByLineWidget, scroll_by_line.foreground), |
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| 61 | XtRString, "Black"}, |
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| 62 | {XtNinnerWidth, XtCWidth, XtRInt, sizeof(int), |
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| 63 | XtOffset(ScrollByLineWidget, scroll_by_line.inner_width), |
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| 64 | XtRString, "100"}, |
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| 65 | {XtNinnerHeight, XtCHeight, XtRInt, sizeof(int), |
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| 66 | XtOffset(ScrollByLineWidget, scroll_by_line.inner_height), |
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| 67 | XtRString, "100"}, |
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| 68 | {XtNforceBars, XtCBoolean, XtRBoolean, sizeof(Boolean), |
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| 69 | XtOffset(ScrollByLineWidget, scroll_by_line.force_bars), |
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| 70 | XtRString, "FALSE"}, |
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| 71 | {XtNallowHoriz, XtCBoolean, XtRBoolean, sizeof(Boolean), |
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| 72 | XtOffset(ScrollByLineWidget, scroll_by_line.allow_horiz), |
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| 73 | XtRString, "FALSE"}, |
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| 74 | {XtNallowVert, XtCBoolean, XtRBoolean, sizeof(Boolean), |
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| 75 | XtOffset(ScrollByLineWidget, scroll_by_line.allow_vert), |
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| 76 | XtRString, "FALSE"}, |
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| 77 | {XtNuseBottom, XtCBoolean, XtRBoolean, sizeof(Boolean), |
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| 78 | XtOffset(ScrollByLineWidget, scroll_by_line.use_bottom), |
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| 79 | XtRString, "FALSE"}, |
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| 80 | {XtNuseRight, XtCBoolean, XtRBoolean, sizeof(Boolean), |
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| 81 | XtOffset(ScrollByLineWidget, scroll_by_line.use_right), |
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| 82 | XtRString, "FALSE"}, |
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| 83 | {XtNlines, XtCLine, XtRInt, sizeof(int), |
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| 84 | XtOffset(ScrollByLineWidget, scroll_by_line.lines), |
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| 85 | XtRString, "0"}, |
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| 86 | {XtNfontHeight, XtCHeight,XtRInt, sizeof(int), |
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| 87 | XtOffset(ScrollByLineWidget, scroll_by_line.font_height), |
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| 88 | XtRString, "0"}, |
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| 89 | {XtNcallback, XtCCallback, XtRCallback, sizeof(caddr_t), |
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| 90 | XtOffset(ScrollByLineWidget, scroll_by_line.callbacks), |
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| 91 | XtRString, "NULL"}, |
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| 92 | {XtNformOnInner, XtCBoolean, XtRBoolean, sizeof(Boolean), |
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| 93 | XtOffset(ScrollByLineWidget, scroll_by_line.key), |
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| 94 | XtRString, "FALSE"}, |
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| 95 | }; |
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| 96 | |
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| 97 | /**************************************************************** |
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| 98 | * |
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| 99 | * Full class record constant |
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| 100 | * |
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| 101 | ****************************************************************/ |
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| 102 | |
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| 103 | static void HorizontalThumb(); |
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| 104 | static Boolean ScrollVerticalText(); |
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| 105 | static void VerticalThumb(); |
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| 106 | static void HorizontalScroll(); |
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| 107 | static void VerticalScroll(); |
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| 108 | static void Page(); |
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| 109 | static void InitializeHook(); |
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| 110 | static void Realize(); |
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| 111 | static void Resize(); |
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| 112 | static void ResetThumb(); |
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| 113 | static void Redisplay(); |
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| 114 | static void ChildExpose(); |
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| 115 | static Boolean SetValues(); |
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| 116 | static int MergeArglists(); |
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| 117 | static Boolean Layout(); |
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| 118 | static XtGeometryResult GeometryManager(); |
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| 119 | static void ChangeManaged(); |
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| 120 | static void ClassInitialize(); |
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| 121 | |
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| 122 | static XtActionsRec actions[] = { |
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| 123 | { "Page", Page}, |
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| 124 | { NULL, NULL}, |
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| 125 | }; |
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| 126 | |
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| 127 | ScrollByLineClassRec scrollByLineClassRec = { |
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| 128 | { |
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| 129 | /* core_class fields */ |
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| 130 | /* superclass */ (WidgetClass) &compositeClassRec, |
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| 131 | /* class_name */ "ScrollByLine", |
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| 132 | /* widget_size */ sizeof(ScrollByLineRec), |
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| 133 | /* class_initialize */ ClassInitialize, |
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| 134 | /* class_part_init */ NULL, |
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| 135 | /* class_inited */ FALSE, |
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| 136 | /* initialize */ NULL, |
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| 137 | /* initialize_hook */ InitializeHook, |
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| 138 | /* realize */ Realize, |
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| 139 | /* actions */ actions, |
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| 140 | /* num_actions */ XtNumber(actions), |
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| 141 | /* resources */ resources, |
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| 142 | /* num_resources */ XtNumber(resources), |
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| 143 | /* xrm_class */ NULLQUARK, |
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| 144 | /* compress_motion */ TRUE, |
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| 145 | /* compress_exposure */ FALSE, |
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| 146 | /* compress_enterleave*/ TRUE, |
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| 147 | /* visible_interest */ FALSE, |
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| 148 | /* destroy */ NULL, |
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| 149 | /* resize */ Resize, |
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| 150 | /* expose */ Redisplay, |
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| 151 | /* set_values */ SetValues, |
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| 152 | /* set_values_hook */ NULL, |
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| 153 | /* set_values_almost */ XtInheritSetValuesAlmost, |
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| 154 | /* get_values_hook */ NULL, |
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| 155 | /* accept_focus */ NULL, |
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| 156 | /* version */ XtVersion, |
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| 157 | /* callback_private */ NULL, |
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| 158 | /* tm_table */ defaultTranslations, |
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| 159 | },{ |
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| 160 | /* composite_class fields */ |
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| 161 | /* geometry_manager */ GeometryManager, |
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| 162 | /* change_managed */ ChangeManaged, |
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| 163 | /* insert_child */ NULL, /* Inherit from superclass */ |
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| 164 | /* delete_child */ NULL, /* Inherit from superclass */ |
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| 165 | /* move_focus_to_next */ NULL, |
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| 166 | /* move_focus_to_prev */ NULL |
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| 167 | },{ |
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| 168 | /* mumble */ 0 /* Make C compiler happy */ |
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| 169 | } |
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| 170 | }; |
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| 171 | |
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| 172 | WidgetClass scrollByLineWidgetClass = |
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| 173 | (WidgetClass) &scrollByLineClassRec; |
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| 174 | |
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| 175 | |
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| 176 | /**************************************************************** |
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| 177 | * |
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| 178 | * Private Routines |
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| 179 | * |
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| 180 | ****************************************************************/ |
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| 181 | |
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| 182 | /* Function Name: ClassInitialize |
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| 183 | * Description: Used to initialize this class of widgets. |
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| 184 | * Arguments: none. |
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| 185 | * Returns: none. |
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| 186 | */ |
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| 187 | |
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| 188 | static void ClassInitialize() |
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| 189 | { |
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| 190 | CompositeWidgetClass superclass; |
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| 191 | ScrollByLineWidgetClass myclass; |
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| 192 | |
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| 193 | myclass = (ScrollByLineWidgetClass) scrollByLineWidgetClass; |
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| 194 | superclass = (CompositeWidgetClass) myclass->core_class.superclass; |
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| 195 | |
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| 196 | /* Inherit insert_child and delete_child from Composite */ |
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| 197 | myclass->composite_class.insert_child = |
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| 198 | superclass->composite_class.insert_child; |
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| 199 | myclass->composite_class.delete_child = |
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| 200 | superclass->composite_class.delete_child; |
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| 201 | } |
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| 202 | |
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| 203 | /* Function Name: Layout |
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| 204 | * Description: This function lays out the scroll_by_line widget. |
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| 205 | * Arguments: w - the scroll_by_line widget. |
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| 206 | * Returns: TRUE if successful. |
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| 207 | */ |
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| 208 | |
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| 209 | static Boolean |
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| 210 | Layout(w,key) |
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| 211 | Widget w; |
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| 212 | int key; |
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| 213 | { |
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| 214 | ScrollByLineWidget sblw = (ScrollByLineWidget) w; |
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| 215 | Dimension width,height; /* The size that the widget would like to be */ |
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| 216 | XtGeometryResult answer; /* the answer from the parent. */ |
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| 217 | Widget hbar,vbar,child; /* The three children of this |
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| 218 | scrolled widget. */ |
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| 219 | int vbar_x,vbar_y; /* The locations of the various elements. */ |
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| 220 | int hbar_x,hbar_y; |
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| 221 | int child_x,child_y; |
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| 222 | int c_width,c_height; |
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| 223 | Boolean make_bar; |
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| 224 | |
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| 225 | vbar = sblw->composite.children[0]; |
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| 226 | hbar = sblw->composite.children[1]; |
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| 227 | child = sblw->composite.children[2]; |
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| 228 | height = sblw->core.height; |
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| 229 | width = sblw->core.width; |
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| 230 | |
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| 231 | /* set the initial scroll bar positions. */ |
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| 232 | |
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| 233 | vbar_x = vbar_y = 0; |
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| 234 | hbar_x = hbar_y = 0; |
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| 235 | |
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| 236 | /* Should I allow the vertical scrollbar to be seen */ |
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| 237 | |
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| 238 | make_bar = FALSE; |
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| 239 | if ( (!key) && (sblw->scroll_by_line.lines * |
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| 240 | sblw->scroll_by_line.font_height > height) ) |
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| 241 | make_bar = TRUE; |
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| 242 | |
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| 243 | else if ( (key) && (sblw->scroll_by_line.lines * |
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| 244 | sblw->scroll_by_line.font_height > child->core.height) ) |
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| 245 | make_bar = TRUE; |
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| 246 | |
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| 247 | if (sblw->scroll_by_line.allow_vert && (sblw->scroll_by_line.force_bars || |
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| 248 | make_bar) ) { |
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| 249 | /* |
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| 250 | * Resize the outer window to fit the child, or visa versa. Also make scroll |
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| 251 | * bar become placed in the correct location. |
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| 252 | */ |
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| 253 | if (key) |
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| 254 | width = child->core.width + vbar->core.width + |
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| 255 | 2 * vbar->core.border_width; |
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| 256 | else |
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| 257 | c_width = width - vbar->core.width -2 * vbar->core.border_width; |
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| 258 | |
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| 259 | /* Put Scrollbar on right side if scrolled window? */ |
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| 260 | |
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| 261 | if (sblw->scroll_by_line.use_right) { |
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| 262 | vbar_x = width - vbar->core.width - 2 * vbar->core.border_width; |
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| 263 | child_x = 0; |
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| 264 | } |
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| 265 | else { |
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| 266 | child_x = vbar->core.width + 2 * vbar->core.border_width; |
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| 267 | vbar_x = 0; |
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| 268 | } |
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| 269 | } |
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| 270 | else { |
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| 271 | /* Make the scroll bar dissappear, note how scroll bar is always there, |
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| 272 | sometimes it is just that we cannot see them. */ |
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| 273 | vbar_x = - vbar->core.width - 10; |
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| 274 | child_x = 0; |
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| 275 | if (key) |
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| 276 | width = child->core.width; |
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| 277 | else |
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| 278 | c_width = width; |
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| 279 | } |
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| 280 | |
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| 281 | /* set the horizontal bar position. */ |
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| 282 | |
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| 283 | /* should we allow the horiz. scroll bar. */ |
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| 284 | |
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| 285 | if (sblw->scroll_by_line.allow_horiz && (child->core.width >= width || |
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| 286 | sblw->scroll_by_line.force_bars)) { |
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| 287 | if (key) |
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| 288 | height = child->core.height + hbar->core.height + |
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| 289 | 2 * hbar->core.border_width; |
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| 290 | else |
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| 291 | c_height = height - hbar->core.height - 2 * hbar->core.border_width; |
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| 292 | |
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| 293 | hbar_x = child_x; |
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| 294 | |
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| 295 | /* Should we put the scroll bar on the bottom?? */ |
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| 296 | |
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| 297 | if (sblw->scroll_by_line.use_bottom) { |
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| 298 | hbar_y = height - hbar->core.height - 2 * hbar->core.border_width; |
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| 299 | child_y = 0; |
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| 300 | } |
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| 301 | else { |
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| 302 | child_y = hbar->core.height + 2 * hbar->core.border_width; |
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| 303 | vbar_y = child_y; |
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| 304 | hbar_y = 0; |
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| 305 | } |
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| 306 | } |
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| 307 | else { |
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| 308 | /* make this scroll bar disappear. */ |
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| 309 | hbar_y = - hbar->core.height - 10; |
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| 310 | child_y = 0; |
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| 311 | if (key) |
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| 312 | height = child->core.height; |
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| 313 | else |
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| 314 | c_height = height; |
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| 315 | } |
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| 316 | |
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| 317 | /* if the windows are realized we have to move them. */ |
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| 318 | |
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| 319 | if (XtIsRealized( (Widget) sblw)) { |
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| 320 | XtMoveWidget(hbar,hbar_x,hbar_y); |
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| 321 | XtMoveWidget(vbar,vbar_x,vbar_y); |
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| 322 | XtMoveWidget(child,child_x,child_y); |
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| 323 | |
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| 324 | /* resize the children to be the correct height or width. */ |
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| 325 | |
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| 326 | XtResizeWidget(vbar,vbar->core.width,height - |
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| 327 | 2 * vbar->core.border_width - vbar_y, |
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| 328 | vbar->core.border_width); |
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| 329 | |
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| 330 | XtResizeWidget(hbar,width - hbar_x - |
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| 331 | 2 * hbar->core.border_width, |
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| 332 | hbar->core.height,hbar->core.border_width); |
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| 333 | |
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| 334 | if (!key) |
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| 335 | XtResizeWidget(child, (Cardinal) c_width, (Cardinal) c_height, |
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| 336 | child->core.border_width); |
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| 337 | |
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| 338 | } |
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| 339 | /* |
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| 340 | * If they are not realized we do not need to move them then just set their |
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| 341 | * core values, this saves a bit of time. |
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| 342 | */ |
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| 343 | else { |
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| 344 | hbar->core.x = hbar_x; |
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| 345 | hbar->core.y = hbar_y; |
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| 346 | vbar->core.x = vbar_x; |
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| 347 | vbar->core.y = vbar_y; |
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| 348 | child->core.x = child_x; |
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| 349 | child->core.y = child_y; |
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| 350 | |
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| 351 | /* resize the scrollbars to be the correct height or width. */ |
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| 352 | |
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| 353 | XtResizeWidget(vbar,vbar->core.width,height - |
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| 354 | 2 * vbar->core.border_width - vbar_y, |
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| 355 | vbar->core.border_width); |
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| 356 | |
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| 357 | XtResizeWidget(hbar,width - hbar_x - |
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| 358 | 2 * hbar->core.border_width, |
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| 359 | hbar->core.height,hbar->core.border_width); |
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| 360 | |
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| 361 | if (!key) { |
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| 362 | child->core.width = c_width; |
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| 363 | child->core.height = c_height; |
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| 364 | } |
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| 365 | } |
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| 366 | |
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| 367 | height = height; |
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| 368 | width = width; |
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| 369 | |
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| 370 | /* set the thumb size to be correct. */ |
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| 371 | |
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| 372 | ResetThumb( (Widget) sblw); |
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| 373 | |
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| 374 | answer = XtMakeResizeRequest( (Widget) sblw, width, height, &width, &height); |
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| 375 | |
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| 376 | switch(answer) { |
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| 377 | case XtGeometryYes: |
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| 378 | break; |
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| 379 | case XtGeometryNo: |
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| 380 | return(FALSE); |
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| 381 | case XtGeometryAlmost: |
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| 382 | (void) Layout( (Widget) sblw,FALSE); |
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| 383 | } |
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| 384 | return(TRUE); |
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| 385 | } |
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| 386 | |
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| 387 | /* Function Name: ResetThumb |
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| 388 | * Description: This function resets the thumb's shown percentage only. |
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| 389 | * Arguments: w - the ScrollByLineWidget. |
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| 390 | * Returns: none; |
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| 391 | */ |
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| 392 | |
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| 393 | static void |
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| 394 | ResetThumb(w) |
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| 395 | Widget w; |
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| 396 | { |
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| 397 | float shown; |
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| 398 | ScrollByLineWidget sblw = (ScrollByLineWidget) w; |
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| 399 | Widget child,vbar,hbar; |
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| 400 | |
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| 401 | vbar = sblw->composite.children[0]; |
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| 402 | hbar = sblw->composite.children[1]; |
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| 403 | child = sblw->composite.children[2]; |
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| 404 | |
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| 405 | /* vertical */ |
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| 406 | |
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| 407 | shown = (float) child->core.height /(float) (sblw->scroll_by_line.lines * |
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| 408 | sblw->scroll_by_line.font_height); |
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| 409 | if (shown > 1.0) |
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| 410 | shown = 1.0; |
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| 411 | |
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| 412 | XtScrollBarSetThumb( vbar, (float) -1, shown ); |
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| 413 | |
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| 414 | /* horizontal */ |
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| 415 | |
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| 416 | shown = (float) child->core.width / (float) child->core.width; |
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| 417 | XtScrollBarSetThumb( hbar, (float) -1, shown ); |
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| 418 | } |
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| 419 | |
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| 420 | /* |
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| 421 | * |
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| 422 | * Geometry Manager - If the height of width is changed then try a new layout. |
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| 423 | * else dissallow the requwest. |
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| 424 | * |
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| 425 | */ |
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| 426 | |
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| 427 | /*ARGSUSED*/ |
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| 428 | static XtGeometryResult GeometryManager(w, request, reply) |
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| 429 | Widget w; |
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| 430 | XtWidgetGeometry *request; |
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| 431 | XtWidgetGeometry *reply; /* RETURN */ |
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| 432 | |
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| 433 | { |
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| 434 | ScrollByLineWidget sblw; |
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| 435 | |
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| 436 | sblw = (ScrollByLineWidget) w->core.parent; |
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| 437 | if ( request->width != 0 && request->height != 0 && |
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| 438 | (request->request_mode && (CWWidth || CWHeight)) ) { |
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| 439 | w->core.height = request->height; |
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| 440 | w->core.width = request->width; |
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| 441 | (void) Layout( (Widget) sblw,TRUE); |
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| 442 | return(XtGeometryYes); |
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| 443 | } |
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| 444 | return(XtGeometryNo); |
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| 445 | |
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| 446 | } /* Geometery Manager */ |
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| 447 | |
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| 448 | /* ARGSUSED */ |
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| 449 | static void ChildExpose(w,junk,event) |
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| 450 | Widget w; |
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| 451 | caddr_t junk; |
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| 452 | XEvent *event; |
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| 453 | { |
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| 454 | |
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| 455 | /* |
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| 456 | * since we are realy concerned with the expose events that happen |
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| 457 | * to the child, we have selected expose events on this window, and |
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| 458 | * then I call the redisplay routine. |
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| 459 | */ |
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| 460 | |
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| 461 | Redisplay(w->core.parent,event); |
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| 462 | } /* ChildExpose */ |
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| 463 | |
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| 464 | /* |
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| 465 | * Repaint the widget's child Window Widget. |
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| 466 | */ |
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| 467 | |
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| 468 | /* ARGSUSED */ |
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| 469 | static void Redisplay(w, event) |
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| 470 | Widget w; |
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| 471 | XEvent *event; |
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| 472 | { |
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| 473 | ScrollByLineWidget sblw = (ScrollByLineWidget) w; |
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| 474 | |
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| 475 | int top,bottom; /* the locations of the top and |
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| 476 | bottom of the region that needs to be |
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| 477 | repainted. */ |
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| 478 | ScrollByLineStruct * sblw_struct; |
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| 479 | |
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| 480 | sblw_struct = (ScrollByLineStruct *) malloc(sizeof(ScrollByLineStruct)); |
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| 481 | |
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| 482 | /* |
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| 483 | * This routine tells the client which sections of the window to |
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| 484 | * repaint in his callback function which does the actual repainting. |
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| 485 | */ |
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| 486 | |
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| 487 | if (event->type == Expose) { |
---|
| 488 | top = event->xexpose.y; |
---|
| 489 | bottom = event->xexpose.height + top; |
---|
| 490 | } |
---|
| 491 | else { |
---|
| 492 | top = event->xgraphicsexpose.y; |
---|
| 493 | bottom = event->xgraphicsexpose.height + top; |
---|
| 494 | } |
---|
| 495 | |
---|
| 496 | sblw_struct->start_line = top / sblw->scroll_by_line.font_height + |
---|
| 497 | sblw->scroll_by_line.line_pointer; |
---|
| 498 | /* |
---|
| 499 | * If an expose event is called on a region that has no text assoicated |
---|
| 500 | * with it then do not redisplay. Only nescessary for very short file. |
---|
| 501 | */ |
---|
| 502 | if (sblw_struct->start_line > sblw->scroll_by_line.lines) |
---|
| 503 | return; |
---|
| 504 | sblw_struct->num_lines = (bottom - top) / |
---|
| 505 | sblw->scroll_by_line.font_height + 1; |
---|
| 506 | sblw_struct->location = top / sblw->scroll_by_line.font_height * |
---|
| 507 | sblw->scroll_by_line.font_height; |
---|
| 508 | |
---|
| 509 | XtCallCallbacks( (Widget) sblw, XtNcallback, (caddr_t) sblw_struct); |
---|
| 510 | |
---|
| 511 | free(sblw_struct); |
---|
| 512 | |
---|
| 513 | } /* redisplay (expose) */ |
---|
| 514 | |
---|
| 515 | static void |
---|
| 516 | Resize(w) |
---|
| 517 | Widget w; |
---|
| 518 | { |
---|
| 519 | |
---|
| 520 | (void) Layout(w,FALSE); |
---|
| 521 | |
---|
| 522 | } /* Resize */ |
---|
| 523 | |
---|
| 524 | static void ChangeManaged(w) |
---|
| 525 | Widget w; |
---|
| 526 | { |
---|
| 527 | /* note how we ignore bonus children, but since we control all children, |
---|
| 528 | there should never be a problem anyway. */ |
---|
| 529 | ScrollByLineWidget sblw = (ScrollByLineWidget) w;; |
---|
| 530 | |
---|
| 531 | if (sblw->composite.num_children == 3) { |
---|
| 532 | (void) Layout( w,sblw->scroll_by_line.key); |
---|
| 533 | } |
---|
| 534 | |
---|
| 535 | } /* Change Managed */ |
---|
| 536 | |
---|
| 537 | /* Function Name: Page |
---|
| 538 | * Description: This function pages the widget, by the amount it recieves |
---|
| 539 | * from the translation Manager. |
---|
| 540 | * Arguments: w - the ScrollByLineWidget. |
---|
| 541 | * event - the event that caused this return. |
---|
| 542 | * params - the parameters passed to it. |
---|
| 543 | * num_params - the number of parameters. |
---|
| 544 | * Returns: none. |
---|
| 545 | */ |
---|
| 546 | |
---|
| 547 | static void |
---|
| 548 | Page(w, event, params, num_params) |
---|
| 549 | Widget w; |
---|
| 550 | XEvent * event; |
---|
| 551 | String * params; |
---|
| 552 | Cardinal *num_params; |
---|
| 553 | { |
---|
| 554 | ScrollByLineWidget sblw = (ScrollByLineWidget) w; |
---|
| 555 | Widget vbar = sblw->composite.children[0]; |
---|
| 556 | char direction; |
---|
| 557 | |
---|
| 558 | if (*num_params > 0) |
---|
| 559 | direction = *params[0]; |
---|
| 560 | else |
---|
| 561 | return; |
---|
| 562 | |
---|
| 563 | /* |
---|
| 564 | * If no scroll bar is visible then do not page, as the entire window is shown, |
---|
| 565 | * of scrolling has been turned off. |
---|
| 566 | */ |
---|
| 567 | |
---|
| 568 | if (vbar->core.x < 0) |
---|
| 569 | return; |
---|
| 570 | |
---|
| 571 | switch ( direction ) { |
---|
| 572 | case 'f': |
---|
| 573 | case 'F': |
---|
| 574 | /* move one page forward */ |
---|
| 575 | VerticalScroll(vbar,NULL, (int) vbar->core.height); |
---|
| 576 | break; |
---|
| 577 | case 'b': |
---|
| 578 | case 'B': |
---|
| 579 | /* move one page backward */ |
---|
| 580 | VerticalScroll(vbar,NULL, (int) - vbar->core.height); |
---|
| 581 | break; |
---|
| 582 | case 'L': |
---|
| 583 | case 'l': |
---|
| 584 | /* move one line forward */ |
---|
| 585 | VerticalScroll(vbar,NULL, (int) sblw->scroll_by_line.font_height); |
---|
| 586 | break; |
---|
| 587 | default: |
---|
| 588 | return; |
---|
| 589 | } |
---|
| 590 | } |
---|
| 591 | |
---|
| 592 | /* Function Name: ScrollVerticalText |
---|
| 593 | * Description: This accomplished the actual movement of the text. |
---|
| 594 | * Arguments: w - the ScrollByLine Widget. |
---|
| 595 | * new_line - the new location for the line pointer |
---|
| 596 | * force_redisplay - should we force this window to get |
---|
| 597 | * redisplayed? |
---|
| 598 | * Returns: True if the thumb needs to be moved. |
---|
| 599 | */ |
---|
| 600 | |
---|
| 601 | static Boolean |
---|
| 602 | ScrollVerticalText(w,new_line,force_redisp) |
---|
| 603 | Widget w; |
---|
| 604 | int new_line; |
---|
| 605 | Boolean force_redisp; |
---|
| 606 | { |
---|
| 607 | ScrollByLineWidget sblw = (ScrollByLineWidget) w; |
---|
| 608 | int max_lines, /* The location of top of the last screen. */ |
---|
| 609 | num_lines, /* The number of lines in one screen of text */ |
---|
| 610 | y_pos, /* The location to start displaying text. */ |
---|
| 611 | num_lines_disp, /* The number of lines to display. */ |
---|
| 612 | start_line, /* The line to start displaying text. */ |
---|
| 613 | y_location, /* The y_location to for storing copy area. */ |
---|
| 614 | lines_to_move; /* The number of lines to copy. */ |
---|
| 615 | GC gc; |
---|
| 616 | Widget child,vbar; /* Widgets. */ |
---|
| 617 | ScrollByLineStruct * sblw_struct; |
---|
| 618 | Boolean move_thumb = FALSE; |
---|
| 619 | |
---|
| 620 | child = sblw->composite.children[2]; |
---|
| 621 | vbar = sblw->composite.children[0]; |
---|
| 622 | |
---|
| 623 | num_lines = child->core.height / sblw->scroll_by_line.font_height; |
---|
| 624 | |
---|
| 625 | gc = XCreateGC(XtDisplay( (Widget) sblw),XtWindow(child),NULL,0); |
---|
| 626 | XSetGraphicsExposures(XtDisplay( (Widget) sblw),gc,TRUE); |
---|
| 627 | |
---|
| 628 | /* do not let the window extend out of bounds */ |
---|
| 629 | |
---|
| 630 | if ( new_line < 0) { |
---|
| 631 | move_thumb = TRUE; |
---|
| 632 | new_line = 0; |
---|
| 633 | } |
---|
| 634 | else { |
---|
| 635 | max_lines = sblw->scroll_by_line.lines - |
---|
| 636 | child->core.height / sblw->scroll_by_line.font_height; |
---|
| 637 | |
---|
| 638 | if ( new_line > max_lines ) { |
---|
| 639 | new_line = max_lines; |
---|
| 640 | move_thumb = TRUE; |
---|
| 641 | } |
---|
| 642 | } |
---|
| 643 | |
---|
| 644 | if ( new_line == sblw->scroll_by_line.line_pointer && !force_redisp) |
---|
| 645 | /* No change in postion, and no action is nescessary */ |
---|
| 646 | return(move_thumb); |
---|
| 647 | else if ( new_line <= sblw->scroll_by_line.line_pointer) { /* scroll back. */ |
---|
| 648 | if ( sblw->scroll_by_line.line_pointer - new_line >= num_lines |
---|
| 649 | || force_redisp) { |
---|
| 650 | /* |
---|
| 651 | * We have moved so far that no text that is currently on the screen can |
---|
| 652 | * be saved thus there is no need to be clever just clear |
---|
| 653 | * the window and display a full screen of text. |
---|
| 654 | */ |
---|
| 655 | XClearWindow(XtDisplay(child),XtWindow(child)); |
---|
| 656 | y_pos = 0; |
---|
| 657 | start_line = new_line; |
---|
| 658 | num_lines_disp = num_lines; |
---|
| 659 | } |
---|
| 660 | else { |
---|
| 661 | /* |
---|
| 662 | * Move text that is to remain on the screen to its new location, and then |
---|
| 663 | * set up the proper callback values to display the rest of the text. |
---|
| 664 | */ |
---|
| 665 | lines_to_move = num_lines - sblw->scroll_by_line.line_pointer + new_line; |
---|
| 666 | y_location = sblw->scroll_by_line.line_pointer - new_line; |
---|
| 667 | XCopyArea(XtDisplay(vbar),XtWindow(child),XtWindow(child), |
---|
| 668 | gc,0,0,child->core.width, |
---|
| 669 | (lines_to_move + 1) * sblw->scroll_by_line.font_height, |
---|
| 670 | 0,y_location * sblw->scroll_by_line.font_height); |
---|
| 671 | XClearArea( XtDisplay(vbar),XtWindow(child),0,0,0, |
---|
| 672 | (num_lines - lines_to_move) |
---|
| 673 | * sblw->scroll_by_line.font_height, |
---|
| 674 | FALSE ); |
---|
| 675 | y_pos = 0; |
---|
| 676 | start_line = new_line; |
---|
| 677 | num_lines_disp = num_lines - lines_to_move; |
---|
| 678 | } |
---|
| 679 | } |
---|
| 680 | else { /* scrolling forward */ |
---|
| 681 | if ( new_line - sblw->scroll_by_line.line_pointer >= num_lines |
---|
| 682 | || force_redisp) { |
---|
| 683 | /* |
---|
| 684 | * We have moved so far that no text that is currently on the screen can |
---|
| 685 | * be saved thus there is no need to be clever just clear |
---|
| 686 | * the window and display a full screen of text. |
---|
| 687 | */ |
---|
| 688 | XClearWindow(XtDisplay(child),XtWindow(child)); |
---|
| 689 | y_pos = 0; |
---|
| 690 | start_line = new_line; |
---|
| 691 | num_lines_disp = num_lines; |
---|
| 692 | } |
---|
| 693 | else { |
---|
| 694 | /* |
---|
| 695 | * Move text that is to remain on the screen to its new location, and then |
---|
| 696 | * set up the proper callback values to display the rest of the text. |
---|
| 697 | */ |
---|
| 698 | lines_to_move = num_lines - new_line + sblw->scroll_by_line.line_pointer; |
---|
| 699 | y_location = new_line - sblw->scroll_by_line.line_pointer; |
---|
| 700 | XCopyArea(XtDisplay(vbar),XtWindow(child),XtWindow(child),gc,0, |
---|
| 701 | y_location * sblw->scroll_by_line.font_height, |
---|
| 702 | child->core.width, |
---|
| 703 | (lines_to_move)* sblw->scroll_by_line.font_height,0,0); |
---|
| 704 | |
---|
| 705 | lines_to_move--; /* make sure that we get the last, |
---|
| 706 | (possibly) partial line, fully painted. */ |
---|
| 707 | |
---|
| 708 | /* we add 10% of a font height here to the vertical position |
---|
| 709 | because some characters extend a little bit below the fontheight */ |
---|
| 710 | |
---|
| 711 | XClearArea(XtDisplay(vbar),XtWindow(child),0,lines_to_move * |
---|
| 712 | sblw->scroll_by_line.font_height + (int) |
---|
| 713 | (.1 * (float) sblw->scroll_by_line.font_height),0,0,FALSE); |
---|
| 714 | |
---|
| 715 | y_pos = lines_to_move * sblw->scroll_by_line.font_height; |
---|
| 716 | start_line = new_line + lines_to_move; |
---|
| 717 | num_lines_disp = num_lines - lines_to_move; |
---|
| 718 | } |
---|
| 719 | } |
---|
| 720 | |
---|
| 721 | sblw->scroll_by_line.line_pointer = new_line; |
---|
| 722 | |
---|
| 723 | /* |
---|
| 724 | * call the callbacks, this is the callback to the application to do the |
---|
| 725 | * actual painting of the text. |
---|
| 726 | */ |
---|
| 727 | |
---|
| 728 | sblw_struct = (ScrollByLineStruct *) malloc(sizeof(ScrollByLineStruct)); |
---|
| 729 | |
---|
| 730 | sblw_struct->location = y_pos; |
---|
| 731 | sblw_struct->start_line = start_line; |
---|
| 732 | sblw_struct->num_lines = num_lines_disp; |
---|
| 733 | |
---|
| 734 | XtCallCallbacks( (Widget) sblw,XtNcallback, (caddr_t) sblw_struct); |
---|
| 735 | |
---|
| 736 | /* Save that memory */ |
---|
| 737 | |
---|
| 738 | XFreeGC(XtDisplay( (Widget) sblw), gc); |
---|
| 739 | free(sblw_struct); |
---|
| 740 | |
---|
| 741 | return(move_thumb); |
---|
| 742 | } |
---|
| 743 | |
---|
| 744 | /* Function Name: VerticalThumb |
---|
| 745 | * Description: This function moves the postition of the interior window |
---|
| 746 | * as the vertical scroll bar is moved. |
---|
| 747 | * Arguments: w - the scrollbar widget. |
---|
| 748 | * junk - not used. |
---|
| 749 | * percent - the position of the scrollbar. |
---|
| 750 | * Returns: none. |
---|
| 751 | */ |
---|
| 752 | |
---|
| 753 | static void |
---|
| 754 | VerticalThumb(w,junk,percent) |
---|
| 755 | Widget w; |
---|
| 756 | caddr_t junk; |
---|
| 757 | float percent; |
---|
| 758 | { |
---|
| 759 | int new_line; /* The new location for the line pointer. */ |
---|
| 760 | float location; /* The location of the thumb. */ |
---|
| 761 | Widget vbar; |
---|
| 762 | |
---|
| 763 | ScrollByLineWidget sblw = (ScrollByLineWidget) w->core.parent; |
---|
| 764 | |
---|
| 765 | vbar = sblw->composite.children[0]; |
---|
| 766 | |
---|
| 767 | new_line = (int) ((float) sblw->scroll_by_line.lines * percent); |
---|
| 768 | |
---|
| 769 | if (ScrollVerticalText( (Widget) sblw, new_line, FALSE)) { |
---|
| 770 | /* reposition the thumb */ |
---|
| 771 | location = (float) sblw->scroll_by_line.line_pointer / |
---|
| 772 | (float) sblw->scroll_by_line.lines; |
---|
| 773 | XtScrollBarSetThumb( vbar, location , (float) -1 ); |
---|
| 774 | } |
---|
| 775 | |
---|
| 776 | } |
---|
| 777 | |
---|
| 778 | /* Function Name: VerticalScroll |
---|
| 779 | * Description: This function moves the postition of the interior window |
---|
| 780 | * as the vertical scroll bar is moved. |
---|
| 781 | * Arguments: w - the scrollbar widget. |
---|
| 782 | * junk - not used. |
---|
| 783 | * pos - the position of the cursor. |
---|
| 784 | * Returns: none. |
---|
| 785 | */ |
---|
| 786 | |
---|
| 787 | static void |
---|
| 788 | VerticalScroll(w,junk,pos) |
---|
| 789 | Widget w; |
---|
| 790 | caddr_t junk; |
---|
| 791 | int pos; |
---|
| 792 | { |
---|
| 793 | int new_line; /* The new location for the line pointer. */ |
---|
| 794 | float location; /* The new location of the thumb. */ |
---|
| 795 | Widget vbar; |
---|
| 796 | |
---|
| 797 | ScrollByLineWidget sblw = (ScrollByLineWidget) w->core.parent; |
---|
| 798 | |
---|
| 799 | vbar = sblw->composite.children[0]; |
---|
| 800 | |
---|
| 801 | new_line = sblw->scroll_by_line.line_pointer; |
---|
| 802 | new_line += (int) pos / sblw->scroll_by_line.font_height; |
---|
| 803 | |
---|
| 804 | (void) ScrollVerticalText( (Widget) sblw,new_line,FALSE); |
---|
| 805 | |
---|
| 806 | /* reposition the thumb */ |
---|
| 807 | |
---|
| 808 | location = (float) sblw->scroll_by_line.line_pointer / |
---|
| 809 | (float) sblw->scroll_by_line.lines; |
---|
| 810 | XtScrollBarSetThumb( vbar, location , (float) -1 ); |
---|
| 811 | |
---|
| 812 | |
---|
| 813 | } |
---|
| 814 | |
---|
| 815 | /* |
---|
| 816 | * I have not thought out the horizontal scrolling yet, I am not sure what |
---|
| 817 | * should be done here. This code is questionable. |
---|
| 818 | */ |
---|
| 819 | |
---|
| 820 | |
---|
| 821 | /* Function Name: HorizontalThumb |
---|
| 822 | * Description: This function moves the postition of the interior window |
---|
| 823 | * as the vertical scroll bar is moved. |
---|
| 824 | * Arguments: w - the scrollbar widget. |
---|
| 825 | * junk - not used. |
---|
| 826 | * percent - the position of the scrollbar. |
---|
| 827 | * Returns: none. |
---|
| 828 | */ |
---|
| 829 | |
---|
| 830 | static void |
---|
| 831 | HorizontalThumb(w,junk,percent) |
---|
| 832 | Widget w; |
---|
| 833 | caddr_t junk; |
---|
| 834 | float percent; |
---|
| 835 | { |
---|
| 836 | int x, y; |
---|
| 837 | Widget child,vbar; |
---|
| 838 | ScrollByLineWidget sblw = (ScrollByLineWidget) w->core.parent; |
---|
| 839 | |
---|
| 840 | /* reposition the client window (child[2]) */ |
---|
| 841 | |
---|
| 842 | vbar = sblw->composite.children[0]; |
---|
| 843 | child = sblw->composite.children[2]; |
---|
| 844 | |
---|
| 845 | x = (int) ( (0.0 - percent) * ((float) child->core.width)); |
---|
| 846 | y = child->core.y; |
---|
| 847 | |
---|
| 848 | /* |
---|
| 849 | * if there is a vertical scrollbar and it is on the left then |
---|
| 850 | * allow room for it . |
---|
| 851 | */ |
---|
| 852 | |
---|
| 853 | if (vbar->core.x == 0) |
---|
| 854 | x += vbar->core.width + 2 * vbar->core.border_width; |
---|
| 855 | |
---|
| 856 | XtMoveWidget(child,x,y); |
---|
| 857 | } |
---|
| 858 | |
---|
| 859 | /* Function Name: HorizontalScroll |
---|
| 860 | * Description: This function moves the postition of the interior window |
---|
| 861 | * as the horizontal scroll bar is moved. |
---|
| 862 | * Arguments: w - the scrollbar widget. |
---|
| 863 | * junk - not used. |
---|
| 864 | * pos - the position of the cursor. |
---|
| 865 | * Returns: none. |
---|
| 866 | */ |
---|
| 867 | |
---|
| 868 | static void |
---|
| 869 | HorizontalScroll(w,junk,pos) |
---|
| 870 | Widget w; |
---|
| 871 | caddr_t junk; |
---|
| 872 | int pos; |
---|
| 873 | { |
---|
| 874 | int x, y, min_x; |
---|
| 875 | float location; |
---|
| 876 | Widget child,vbar,hbar; |
---|
| 877 | ScrollByLineWidget sblw = (ScrollByLineWidget) w->core.parent; |
---|
| 878 | |
---|
| 879 | /* reposition the client window (child[2]) */ |
---|
| 880 | |
---|
| 881 | vbar = sblw->composite.children[0]; |
---|
| 882 | hbar = sblw->composite.children[1]; |
---|
| 883 | child = sblw->composite.children[2]; |
---|
| 884 | |
---|
| 885 | x = child->core.x - pos; |
---|
| 886 | y = child->core.y; |
---|
| 887 | |
---|
| 888 | /* |
---|
| 889 | * Keep us in bounds. |
---|
| 890 | */ |
---|
| 891 | |
---|
| 892 | if ( x > 0 ) x = 0; |
---|
| 893 | min_x = - (child->core.width - hbar->core.width - |
---|
| 894 | 2 * vbar->core.border_width); |
---|
| 895 | |
---|
| 896 | if (vbar->core.y > 0) /* vertical scrollbar is on right.*/ |
---|
| 897 | min_x -= vbar->core.width + 2 * vbar->core.border_width; |
---|
| 898 | |
---|
| 899 | if ( x < min_x ) x = min_x; |
---|
| 900 | |
---|
| 901 | /* reposition the thumb */ |
---|
| 902 | |
---|
| 903 | location = 0.0 - (float) y / (float) child->core.width; |
---|
| 904 | XtScrollBarSetThumb( hbar, location , (float) -1 ); |
---|
| 905 | |
---|
| 906 | /* |
---|
| 907 | * if there is a vertical scrollbar and it is on the left then |
---|
| 908 | * allow room for it . |
---|
| 909 | */ |
---|
| 910 | |
---|
| 911 | if (vbar->core.x == 0) |
---|
| 912 | y += vbar->core.width + 2 * vbar->core.border_width; |
---|
| 913 | |
---|
| 914 | XtMoveWidget(child,x,y); /* he's my child so I can move him. */ |
---|
| 915 | } |
---|
| 916 | |
---|
| 917 | static void InitializeHook(new, args, num_args) |
---|
| 918 | ScrollByLineWidget new; |
---|
| 919 | ArgList args; |
---|
| 920 | Cardinal *num_args; |
---|
| 921 | { |
---|
| 922 | ScrollByLineWidget sblw = (ScrollByLineWidget) new; |
---|
| 923 | Widget window; /* Window widget. */ |
---|
| 924 | Arg arglist[50]; /* Must be large enough for the |
---|
| 925 | arglist from the scrolled widget to |
---|
| 926 | be added to it. */ |
---|
| 927 | Cardinal scrollbar_num; /* the number of scrollbar args. */ |
---|
| 928 | Cardinal window_num; /* the number of window args. */ |
---|
| 929 | |
---|
| 930 | static XtCallbackRec scrollcallback[] = { /* The scroll callback function. */ |
---|
| 931 | { NULL, NULL }, |
---|
| 932 | { NULL, NULL }, |
---|
| 933 | }; |
---|
| 934 | static XtCallbackRec thumbcallback[] = { /* The thumb callback function. */ |
---|
| 935 | { NULL, NULL }, |
---|
| 936 | { NULL, NULL }, |
---|
| 937 | }; |
---|
| 938 | |
---|
| 939 | sblw->scroll_by_line.line_pointer = 0; /* initial point to line 0. */ |
---|
| 940 | |
---|
| 941 | if (sblw->core.height <= 0) |
---|
| 942 | sblw->core.height = DEFAULT_HEIGHT; |
---|
| 943 | if (sblw->core.width <= 0) |
---|
| 944 | sblw->core.width = DEFAULT_WIDTH; |
---|
| 945 | |
---|
| 946 | scrollbar_num = 0; |
---|
| 947 | XtSetArg(arglist[scrollbar_num], XtNheight, 10); /* changed in layout. */ |
---|
| 948 | scrollbar_num++; |
---|
| 949 | XtSetArg(arglist[scrollbar_num], XtNwidth, 16); |
---|
| 950 | scrollbar_num++; |
---|
| 951 | XtSetArg(arglist[scrollbar_num], XtNorientation, XtorientVertical); |
---|
| 952 | scrollbar_num++; |
---|
| 953 | thumbcallback[0].callback = VerticalThumb; |
---|
| 954 | scrollcallback[0].callback = VerticalScroll; |
---|
| 955 | XtSetArg(arglist[scrollbar_num], XtNthumbProc, thumbcallback); |
---|
| 956 | scrollbar_num++; |
---|
| 957 | XtSetArg(arglist[scrollbar_num], XtNscrollProc, scrollcallback); |
---|
| 958 | scrollbar_num++; |
---|
| 959 | |
---|
| 960 | /* |
---|
| 961 | * Merge the argument lists so but have the scrollbar arglist take |
---|
| 962 | * control when there is a discrepency this causes us to get the |
---|
| 963 | * correct height and width. |
---|
| 964 | */ |
---|
| 965 | |
---|
| 966 | scrollbar_num = MergeArglists(args, *num_args,arglist,scrollbar_num); |
---|
| 967 | |
---|
| 968 | XtCreateManagedWidget("Vertical Scroll Bar", |
---|
| 969 | scrollbarWidgetClass, (Widget) sblw,arglist,scrollbar_num); |
---|
| 970 | |
---|
| 971 | scrollbar_num = 0; |
---|
| 972 | XtSetArg(arglist[scrollbar_num], XtNwidth, 10); /* changed in layout. */ |
---|
| 973 | scrollbar_num++; |
---|
| 974 | XtSetArg(arglist[scrollbar_num], XtNheight, 16); |
---|
| 975 | scrollbar_num++; |
---|
| 976 | XtSetArg(arglist[scrollbar_num], XtNorientation, XtorientHorizontal); |
---|
| 977 | scrollbar_num++; |
---|
| 978 | thumbcallback[0].callback = HorizontalThumb; |
---|
| 979 | scrollcallback[0].callback = HorizontalScroll; |
---|
| 980 | XtSetArg(arglist[scrollbar_num], XtNthumbProc, thumbcallback); |
---|
| 981 | scrollbar_num++; |
---|
| 982 | XtSetArg(arglist[scrollbar_num], XtNscrollProc, scrollcallback); |
---|
| 983 | scrollbar_num++; |
---|
| 984 | |
---|
| 985 | /* |
---|
| 986 | * Merge the argument lists so but have the scrollbar arglist take |
---|
| 987 | * control when there is a discrepency this causes us to get the |
---|
| 988 | * correct height and width. |
---|
| 989 | */ |
---|
| 990 | |
---|
| 991 | scrollbar_num = MergeArglists(args, *num_args,arglist,scrollbar_num); |
---|
| 992 | |
---|
| 993 | XtCreateManagedWidget("Horizontal Scroll Bar", |
---|
| 994 | scrollbarWidgetClass, (Widget) sblw,arglist,scrollbar_num); |
---|
| 995 | |
---|
| 996 | window_num = 0; |
---|
| 997 | XtSetArg(arglist[window_num], XtNwidth, sblw->scroll_by_line.inner_width); |
---|
| 998 | window_num++; |
---|
| 999 | XtSetArg(arglist[window_num], XtNheight, sblw->scroll_by_line.inner_height); |
---|
| 1000 | window_num++; |
---|
| 1001 | XtSetArg(arglist[window_num], XtNborderWidth, 0); |
---|
| 1002 | window_num++; |
---|
| 1003 | |
---|
| 1004 | window = XtCreateWidget("Window with file",widgetClass,(Widget) sblw,arglist, |
---|
| 1005 | window_num); |
---|
| 1006 | XtManageChild(window); |
---|
| 1007 | |
---|
| 1008 | /* We want expose events for this window also. */ |
---|
| 1009 | |
---|
| 1010 | XtAddEventHandler(window, (Cardinal) ExposureMask, FALSE, ChildExpose, NULL); |
---|
| 1011 | |
---|
| 1012 | } /* InitializeHook */ |
---|
| 1013 | |
---|
| 1014 | static void Realize(w, valueMask, attributes) |
---|
| 1015 | register Widget w; |
---|
| 1016 | Mask *valueMask; |
---|
| 1017 | XSetWindowAttributes *attributes; |
---|
| 1018 | { |
---|
| 1019 | XtCreateWindow( w, (Cardinal) InputOutput, (Visual *)CopyFromParent, |
---|
| 1020 | *valueMask, attributes); |
---|
| 1021 | } /* Realize */ |
---|
| 1022 | |
---|
| 1023 | /* |
---|
| 1024 | * |
---|
| 1025 | * Set Values |
---|
| 1026 | * |
---|
| 1027 | */ |
---|
| 1028 | |
---|
| 1029 | static Boolean SetValues (current, request, new) |
---|
| 1030 | Widget current, request, new; |
---|
| 1031 | { |
---|
| 1032 | ScrollByLineWidget sblw_new, sblw_current; |
---|
| 1033 | Boolean ret = FALSE; |
---|
| 1034 | |
---|
| 1035 | sblw_current = (ScrollByLineWidget) current; |
---|
| 1036 | sblw_new = (ScrollByLineWidget) new; |
---|
| 1037 | |
---|
| 1038 | if (sblw_current->scroll_by_line.lines != sblw_new->scroll_by_line.lines) { |
---|
| 1039 | ResetThumb(new); |
---|
| 1040 | ret = TRUE; |
---|
| 1041 | } |
---|
| 1042 | if (sblw_current->scroll_by_line.font_height != |
---|
| 1043 | sblw_new->scroll_by_line.font_height) { |
---|
| 1044 | ResetThumb(new); |
---|
| 1045 | ret = TRUE; |
---|
| 1046 | } |
---|
| 1047 | return(ret); |
---|
| 1048 | |
---|
| 1049 | } /* Set Values */ |
---|
| 1050 | |
---|
| 1051 | /* Function Name: MergeArglists |
---|
| 1052 | * Description: This function merges two arglists. |
---|
| 1053 | * Arguments: from,num_from - the number and list of args for the source. |
---|
| 1054 | * to,num_to - the number and list of argument for the |
---|
| 1055 | * destination. |
---|
| 1056 | * Returns: new number of argument in to. |
---|
| 1057 | */ |
---|
| 1058 | |
---|
| 1059 | /* Note: This function will be very unhappy with you if 'to' is not |
---|
| 1060 | * large enough to contain 'from', you will end up with pointers |
---|
| 1061 | * in space. |
---|
| 1062 | */ |
---|
| 1063 | |
---|
| 1064 | static int |
---|
| 1065 | MergeArglists(from,num_from,to,num_to) |
---|
| 1066 | Arg from[],to[]; |
---|
| 1067 | Cardinal num_from,num_to; |
---|
| 1068 | { |
---|
| 1069 | int i,j; /* a counter. */ |
---|
| 1070 | |
---|
| 1071 | /* When there are two similar values ignore the from value. */ |
---|
| 1072 | |
---|
| 1073 | i = 0; |
---|
| 1074 | while ( i < num_from ) { |
---|
| 1075 | j = 0; |
---|
| 1076 | while ( j < num_to ) { |
---|
| 1077 | if ( !strcmp(from[i].name,to[j].name) ) { |
---|
| 1078 | /* if they are the same then goto next on the from list, |
---|
| 1079 | i.e. ignore this entry, do not add to to list. */ |
---|
| 1080 | i++; |
---|
| 1081 | if ( i > num_from) |
---|
| 1082 | j = num_to + 100; |
---|
| 1083 | else { |
---|
| 1084 | j = 0; |
---|
| 1085 | continue; |
---|
| 1086 | } |
---|
| 1087 | } |
---|
| 1088 | j++; |
---|
| 1089 | } |
---|
| 1090 | /* add to to list */ |
---|
| 1091 | if (j < num_to + 100) { |
---|
| 1092 | to[num_to].value = from[i].value; |
---|
| 1093 | to[num_to].name = from[i].name; |
---|
| 1094 | num_to++; |
---|
| 1095 | i++; |
---|
| 1096 | } |
---|
| 1097 | } |
---|
| 1098 | return(num_to); |
---|
| 1099 | } |
---|
| 1100 | |
---|
| 1101 | /* Public Routines. */ |
---|
| 1102 | |
---|
| 1103 | /* Function Name: XtScrollByLineWidget() |
---|
| 1104 | * Description: This function returns the window widget that the |
---|
| 1105 | * ScrollByLine widget uses to display its text. |
---|
| 1106 | * Arguments: w - the ScrollByLine Widget. |
---|
| 1107 | * Returns: the widget to display the text into. |
---|
| 1108 | */ |
---|
| 1109 | |
---|
| 1110 | extern Widget XtScrollByLineWidget(w) |
---|
| 1111 | Widget w; |
---|
| 1112 | { |
---|
| 1113 | ScrollByLineWidget sblw = (ScrollByLineWidget) w; /* the sblw widget. */ |
---|
| 1114 | |
---|
| 1115 | return(sblw->composite.children[2]); |
---|
| 1116 | } |
---|
| 1117 | |
---|
| 1118 | /* Function Name: XtResetScrollByLine |
---|
| 1119 | * Description: This function resets the scroll by line widget. |
---|
| 1120 | * Arguments: w - the sblw widget. |
---|
| 1121 | * Returns: none. |
---|
| 1122 | */ |
---|
| 1123 | |
---|
| 1124 | extern void |
---|
| 1125 | XtResetScrollByLine(w) |
---|
| 1126 | Widget w; |
---|
| 1127 | { |
---|
| 1128 | float location; /* the location of the thumb. */ |
---|
| 1129 | ScrollByLineWidget sblw = (ScrollByLineWidget) w; /* the sblw widget. */ |
---|
| 1130 | Widget vbar; |
---|
| 1131 | |
---|
| 1132 | vbar = sblw->composite.children[0]; |
---|
| 1133 | |
---|
| 1134 | (void) ScrollVerticalText( w, 0, TRUE); |
---|
| 1135 | |
---|
| 1136 | /* reposition the thumb */ |
---|
| 1137 | |
---|
| 1138 | location = (float) sblw->scroll_by_line.line_pointer / |
---|
| 1139 | (float) sblw->scroll_by_line.lines; |
---|
| 1140 | XtScrollBarSetThumb( vbar, location , (float) -1 ); |
---|
| 1141 | |
---|
| 1142 | ResetThumb(w); |
---|
| 1143 | } |
---|