1 | /* |
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2 | * Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation |
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3 | * All rights reserved. |
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4 | * |
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5 | * This file is part of the Gnome Library. |
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6 | * |
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7 | * The Gnome Library is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Library General Public License as |
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9 | * published by the Free Software Foundation; either version 2 of the |
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10 | * License, or (at your option) any later version. |
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11 | * |
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12 | * The Gnome Library is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Library General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Library General Public |
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18 | * License along with the Gnome Library; see the file COPYING.LIB. If not, |
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19 | * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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20 | * Boston, MA 02111-1307, USA. |
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21 | */ |
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22 | /* |
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23 | @NOTATION@ |
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24 | */ |
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25 | /* Widget item type for GnomeCanvas widget |
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26 | * |
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27 | * GnomeCanvas is basically a port of the Tk toolkit's most excellent canvas widget. Tk is |
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28 | * copyrighted by the Regents of the University of California, Sun Microsystems, and other parties. |
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29 | * |
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30 | * |
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31 | * Author: Federico Mena <federico@nuclecu.unam.mx> |
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32 | */ |
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33 | |
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34 | #include <config.h> |
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35 | #include <math.h> |
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36 | #include <gtk/gtksignal.h> |
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37 | #include "gnome-canvas-widget.h" |
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38 | |
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39 | enum { |
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40 | PROP_0, |
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41 | PROP_WIDGET, |
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42 | PROP_X, |
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43 | PROP_Y, |
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44 | PROP_WIDTH, |
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45 | PROP_HEIGHT, |
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46 | PROP_ANCHOR, |
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47 | PROP_SIZE_PIXELS |
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48 | }; |
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49 | |
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50 | |
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51 | static void gnome_canvas_widget_class_init (GnomeCanvasWidgetClass *class); |
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52 | static void gnome_canvas_widget_init (GnomeCanvasWidget *witem); |
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53 | static void gnome_canvas_widget_destroy (GtkObject *object); |
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54 | static void gnome_canvas_widget_get_property (GObject *object, |
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55 | guint param_id, |
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56 | GValue *value, |
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57 | GParamSpec *pspec); |
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58 | static void gnome_canvas_widget_set_property (GObject *object, |
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59 | guint param_id, |
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60 | const GValue *value, |
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61 | GParamSpec *pspec); |
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62 | |
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63 | static void gnome_canvas_widget_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags); |
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64 | static double gnome_canvas_widget_point (GnomeCanvasItem *item, double x, double y, |
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65 | int cx, int cy, GnomeCanvasItem **actual_item); |
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66 | static void gnome_canvas_widget_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2); |
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67 | |
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68 | static void gnome_canvas_widget_render (GnomeCanvasItem *item, |
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69 | GnomeCanvasBuf *buf); |
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70 | static void gnome_canvas_widget_draw (GnomeCanvasItem *item, |
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71 | GdkDrawable *drawable, |
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72 | int x, int y, |
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73 | int width, int height); |
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74 | |
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75 | static GnomeCanvasItemClass *parent_class; |
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76 | |
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77 | |
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78 | GType |
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79 | gnome_canvas_widget_get_type (void) |
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80 | { |
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81 | static GType widget_type; |
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82 | |
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83 | if (!widget_type) { |
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84 | static const GTypeInfo object_info = { |
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85 | sizeof (GnomeCanvasWidgetClass), |
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86 | (GBaseInitFunc) NULL, |
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87 | (GBaseFinalizeFunc) NULL, |
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88 | (GClassInitFunc) gnome_canvas_widget_class_init, |
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89 | (GClassFinalizeFunc) NULL, |
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90 | NULL, /* class_data */ |
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91 | sizeof (GnomeCanvasWidget), |
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92 | 0, /* n_preallocs */ |
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93 | (GInstanceInitFunc) gnome_canvas_widget_init, |
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94 | NULL /* value_table */ |
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95 | }; |
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96 | |
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97 | widget_type = g_type_register_static (GNOME_TYPE_CANVAS_ITEM, "GnomeCanvasWidget", |
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98 | &object_info, 0); |
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99 | } |
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100 | |
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101 | return widget_type; |
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102 | } |
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103 | |
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104 | static void |
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105 | gnome_canvas_widget_class_init (GnomeCanvasWidgetClass *class) |
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106 | { |
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107 | GObjectClass *gobject_class; |
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108 | GtkObjectClass *object_class; |
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109 | GnomeCanvasItemClass *item_class; |
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110 | |
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111 | gobject_class = (GObjectClass *) class; |
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112 | object_class = (GtkObjectClass *) class; |
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113 | item_class = (GnomeCanvasItemClass *) class; |
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114 | |
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115 | parent_class = g_type_class_peek_parent (class); |
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116 | |
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117 | gobject_class->set_property = gnome_canvas_widget_set_property; |
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118 | gobject_class->get_property = gnome_canvas_widget_get_property; |
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119 | |
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120 | g_object_class_install_property |
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121 | (gobject_class, |
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122 | PROP_WIDGET, |
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123 | g_param_spec_object ("widget", NULL, NULL, |
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124 | GTK_TYPE_WIDGET, |
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125 | (G_PARAM_READABLE | G_PARAM_WRITABLE))); |
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126 | g_object_class_install_property |
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127 | (gobject_class, |
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128 | PROP_X, |
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129 | g_param_spec_double ("x", NULL, NULL, |
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130 | -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, |
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131 | (G_PARAM_READABLE | G_PARAM_WRITABLE))); |
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132 | g_object_class_install_property |
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133 | (gobject_class, |
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134 | PROP_Y, |
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135 | g_param_spec_double ("y", NULL, NULL, |
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136 | -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, |
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137 | (G_PARAM_READABLE | G_PARAM_WRITABLE))); |
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138 | g_object_class_install_property |
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139 | (gobject_class, |
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140 | PROP_WIDTH, |
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141 | g_param_spec_double ("width", NULL, NULL, |
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142 | -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, |
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143 | (G_PARAM_READABLE | G_PARAM_WRITABLE))); |
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144 | g_object_class_install_property |
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145 | (gobject_class, |
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146 | PROP_HEIGHT, |
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147 | g_param_spec_double ("height", NULL, NULL, |
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148 | -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, |
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149 | (G_PARAM_READABLE | G_PARAM_WRITABLE))); |
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150 | g_object_class_install_property |
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151 | (gobject_class, |
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152 | PROP_ANCHOR, |
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153 | g_param_spec_enum ("anchor", NULL, NULL, |
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154 | GTK_TYPE_ANCHOR_TYPE, |
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155 | GTK_ANCHOR_NW, |
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156 | (G_PARAM_READABLE | G_PARAM_WRITABLE))); |
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157 | g_object_class_install_property |
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158 | (gobject_class, |
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159 | PROP_SIZE_PIXELS, |
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160 | g_param_spec_boolean ("size_pixels", NULL, NULL, |
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161 | FALSE, |
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162 | (G_PARAM_READABLE | G_PARAM_WRITABLE))); |
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163 | |
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164 | object_class->destroy = gnome_canvas_widget_destroy; |
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165 | |
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166 | item_class->update = gnome_canvas_widget_update; |
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167 | item_class->point = gnome_canvas_widget_point; |
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168 | item_class->bounds = gnome_canvas_widget_bounds; |
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169 | item_class->render = gnome_canvas_widget_render; |
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170 | item_class->draw = gnome_canvas_widget_draw; |
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171 | } |
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172 | |
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173 | static void |
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174 | gnome_canvas_widget_init (GnomeCanvasWidget *witem) |
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175 | { |
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176 | witem->x = 0.0; |
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177 | witem->y = 0.0; |
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178 | witem->width = 0.0; |
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179 | witem->height = 0.0; |
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180 | witem->anchor = GTK_ANCHOR_NW; |
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181 | witem->size_pixels = FALSE; |
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182 | } |
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183 | |
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184 | static void |
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185 | gnome_canvas_widget_destroy (GtkObject *object) |
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186 | { |
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187 | GnomeCanvasWidget *witem; |
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188 | |
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189 | g_return_if_fail (object != NULL); |
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190 | g_return_if_fail (GNOME_IS_CANVAS_WIDGET (object)); |
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191 | |
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192 | witem = GNOME_CANVAS_WIDGET (object); |
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193 | |
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194 | if (witem->widget && !witem->in_destroy) { |
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195 | g_signal_handler_disconnect (witem->widget, witem->destroy_id); |
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196 | gtk_widget_destroy (witem->widget); |
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197 | witem->widget = NULL; |
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198 | } |
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199 | |
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200 | if (GTK_OBJECT_CLASS (parent_class)->destroy) |
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201 | (* GTK_OBJECT_CLASS (parent_class)->destroy) (object); |
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202 | } |
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203 | |
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204 | static void |
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205 | recalc_bounds (GnomeCanvasWidget *witem) |
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206 | { |
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207 | GnomeCanvasItem *item; |
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208 | double wx, wy; |
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209 | |
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210 | item = GNOME_CANVAS_ITEM (witem); |
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211 | |
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212 | /* Get world coordinates */ |
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213 | |
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214 | wx = witem->x; |
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215 | wy = witem->y; |
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216 | gnome_canvas_item_i2w (item, &wx, &wy); |
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217 | |
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218 | /* Get canvas pixel coordinates */ |
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219 | |
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220 | gnome_canvas_w2c (item->canvas, wx, wy, &witem->cx, &witem->cy); |
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221 | |
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222 | /* Anchor widget item */ |
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223 | |
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224 | switch (witem->anchor) { |
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225 | case GTK_ANCHOR_NW: |
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226 | case GTK_ANCHOR_W: |
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227 | case GTK_ANCHOR_SW: |
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228 | break; |
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229 | |
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230 | case GTK_ANCHOR_N: |
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231 | case GTK_ANCHOR_CENTER: |
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232 | case GTK_ANCHOR_S: |
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233 | witem->cx -= witem->cwidth / 2; |
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234 | break; |
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235 | |
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236 | case GTK_ANCHOR_NE: |
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237 | case GTK_ANCHOR_E: |
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238 | case GTK_ANCHOR_SE: |
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239 | witem->cx -= witem->cwidth; |
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240 | break; |
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241 | |
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242 | default: |
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243 | break; |
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244 | } |
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245 | |
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246 | switch (witem->anchor) { |
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247 | case GTK_ANCHOR_NW: |
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248 | case GTK_ANCHOR_N: |
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249 | case GTK_ANCHOR_NE: |
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250 | break; |
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251 | |
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252 | case GTK_ANCHOR_W: |
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253 | case GTK_ANCHOR_CENTER: |
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254 | case GTK_ANCHOR_E: |
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255 | witem->cy -= witem->cheight / 2; |
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256 | break; |
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257 | |
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258 | case GTK_ANCHOR_SW: |
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259 | case GTK_ANCHOR_S: |
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260 | case GTK_ANCHOR_SE: |
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261 | witem->cy -= witem->cheight; |
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262 | break; |
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263 | |
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264 | default: |
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265 | break; |
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266 | } |
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267 | |
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268 | /* Bounds */ |
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269 | |
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270 | item->x1 = witem->cx; |
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271 | item->y1 = witem->cy; |
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272 | item->x2 = witem->cx + witem->cwidth; |
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273 | item->y2 = witem->cy + witem->cheight; |
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274 | |
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275 | if (witem->widget) |
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276 | gtk_layout_move (GTK_LAYOUT (item->canvas), witem->widget, |
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277 | witem->cx + item->canvas->zoom_xofs, |
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278 | witem->cy + item->canvas->zoom_yofs); |
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279 | } |
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280 | |
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281 | static void |
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282 | do_destroy (GtkObject *object, gpointer data) |
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283 | { |
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284 | GnomeCanvasWidget *witem; |
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285 | |
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286 | witem = data; |
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287 | |
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288 | witem->in_destroy = TRUE; |
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289 | |
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290 | gtk_object_destroy (data); |
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291 | } |
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292 | |
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293 | static void |
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294 | gnome_canvas_widget_set_property (GObject *object, |
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295 | guint param_id, |
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296 | const GValue *value, |
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297 | GParamSpec *pspec) |
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298 | { |
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299 | GnomeCanvasItem *item; |
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300 | GnomeCanvasWidget *witem; |
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301 | GObject *obj; |
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302 | int update; |
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303 | int calc_bounds; |
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304 | |
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305 | g_return_if_fail (object != NULL); |
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306 | g_return_if_fail (GNOME_IS_CANVAS_WIDGET (object)); |
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307 | |
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308 | item = GNOME_CANVAS_ITEM (object); |
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309 | witem = GNOME_CANVAS_WIDGET (object); |
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310 | |
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311 | update = FALSE; |
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312 | calc_bounds = FALSE; |
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313 | |
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314 | switch (param_id) { |
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315 | case PROP_WIDGET: |
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316 | if (witem->widget) { |
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317 | g_signal_handler_disconnect (witem->widget, witem->destroy_id); |
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318 | gtk_container_remove (GTK_CONTAINER (item->canvas), witem->widget); |
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319 | } |
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320 | |
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321 | obj = g_value_get_object (value); |
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322 | if (obj) { |
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323 | witem->widget = GTK_WIDGET (obj); |
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324 | witem->destroy_id = g_signal_connect (obj, "destroy", |
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325 | G_CALLBACK (do_destroy), |
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326 | witem); |
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327 | gtk_layout_put (GTK_LAYOUT (item->canvas), witem->widget, |
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328 | witem->cx + item->canvas->zoom_xofs, |
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329 | witem->cy + item->canvas->zoom_yofs); |
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330 | } |
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331 | |
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332 | update = TRUE; |
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333 | break; |
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334 | |
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335 | case PROP_X: |
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336 | if (witem->x != g_value_get_double (value)) |
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337 | { |
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338 | witem->x = g_value_get_double (value); |
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339 | calc_bounds = TRUE; |
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340 | } |
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341 | break; |
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342 | |
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343 | case PROP_Y: |
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344 | if (witem->y != g_value_get_double (value)) |
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345 | { |
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346 | witem->y = g_value_get_double (value); |
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347 | calc_bounds = TRUE; |
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348 | } |
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349 | break; |
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350 | |
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351 | case PROP_WIDTH: |
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352 | if (witem->width != fabs (g_value_get_double (value))) |
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353 | { |
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354 | witem->width = fabs (g_value_get_double (value)); |
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355 | update = TRUE; |
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356 | } |
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357 | break; |
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358 | |
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359 | case PROP_HEIGHT: |
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360 | if (witem->height != fabs (g_value_get_double (value))) |
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361 | { |
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362 | witem->height = fabs (g_value_get_double (value)); |
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363 | update = TRUE; |
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364 | } |
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365 | break; |
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366 | |
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367 | case PROP_ANCHOR: |
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368 | if (witem->anchor != g_value_get_enum (value)) |
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369 | { |
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370 | witem->anchor = g_value_get_enum (value); |
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371 | update = TRUE; |
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372 | } |
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373 | break; |
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374 | |
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375 | case PROP_SIZE_PIXELS: |
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376 | if (witem->size_pixels != g_value_get_boolean (value)) |
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377 | { |
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378 | witem->size_pixels = g_value_get_boolean (value); |
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379 | update = TRUE; |
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380 | } |
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381 | break; |
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382 | |
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383 | default: |
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384 | G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec); |
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385 | break; |
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386 | } |
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387 | |
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388 | if (update) |
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389 | (* GNOME_CANVAS_ITEM_GET_CLASS (item)->update) (item, NULL, NULL, 0); |
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390 | |
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391 | if (calc_bounds) |
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392 | recalc_bounds (witem); |
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393 | } |
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394 | |
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395 | static void |
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396 | gnome_canvas_widget_get_property (GObject *object, |
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397 | guint param_id, |
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398 | GValue *value, |
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399 | GParamSpec *pspec) |
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400 | { |
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401 | GnomeCanvasWidget *witem; |
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402 | |
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403 | g_return_if_fail (object != NULL); |
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404 | g_return_if_fail (GNOME_IS_CANVAS_WIDGET (object)); |
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405 | |
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406 | witem = GNOME_CANVAS_WIDGET (object); |
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407 | |
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408 | switch (param_id) { |
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409 | case PROP_WIDGET: |
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410 | g_value_set_object (value, (GObject *) witem->widget); |
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411 | break; |
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412 | |
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413 | case PROP_X: |
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414 | g_value_set_double (value, witem->x); |
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415 | break; |
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416 | |
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417 | case PROP_Y: |
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418 | g_value_set_double (value, witem->y); |
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419 | break; |
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420 | |
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421 | case PROP_WIDTH: |
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422 | g_value_set_double (value, witem->width); |
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423 | break; |
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424 | |
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425 | case PROP_HEIGHT: |
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426 | g_value_set_double (value, witem->height); |
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427 | break; |
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428 | |
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429 | case PROP_ANCHOR: |
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430 | g_value_set_enum (value, witem->anchor); |
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431 | break; |
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432 | |
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433 | case PROP_SIZE_PIXELS: |
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434 | g_value_set_boolean (value, witem->size_pixels); |
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435 | break; |
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436 | |
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437 | default: |
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438 | G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec); |
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439 | break; |
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440 | } |
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441 | } |
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442 | |
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443 | static void |
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444 | gnome_canvas_widget_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags) |
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445 | { |
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446 | GnomeCanvasWidget *witem; |
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447 | |
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448 | witem = GNOME_CANVAS_WIDGET (item); |
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449 | |
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450 | if (parent_class->update) |
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451 | (* parent_class->update) (item, affine, clip_path, flags); |
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452 | |
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453 | if (witem->widget) { |
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454 | if (witem->size_pixels) { |
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455 | witem->cwidth = (int) (witem->width + 0.5); |
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456 | witem->cheight = (int) (witem->height + 0.5); |
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457 | } else { |
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458 | witem->cwidth = (int) (witem->width * item->canvas->pixels_per_unit + 0.5); |
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459 | witem->cheight = (int) (witem->height * item->canvas->pixels_per_unit + 0.5); |
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460 | } |
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461 | |
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462 | gtk_widget_set_size_request (witem->widget, witem->cwidth, witem->cheight); |
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463 | } else { |
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464 | witem->cwidth = 0.0; |
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465 | witem->cheight = 0.0; |
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466 | } |
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467 | |
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468 | recalc_bounds (witem); |
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469 | } |
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470 | |
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471 | static void |
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472 | gnome_canvas_widget_render (GnomeCanvasItem *item, |
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473 | GnomeCanvasBuf *buf) |
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474 | { |
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475 | #if 0 |
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476 | GnomeCanvasWidget *witem; |
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477 | |
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478 | witem = GNOME_CANVAS_WIDGET (item); |
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479 | |
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480 | if (witem->widget) |
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481 | gtk_widget_queue_draw (witem->widget); |
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482 | #endif |
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483 | |
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484 | } |
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485 | |
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486 | static void |
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487 | gnome_canvas_widget_draw (GnomeCanvasItem *item, |
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488 | GdkDrawable *drawable, |
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489 | int x, int y, |
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490 | int width, int height) |
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491 | { |
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492 | #if 0 |
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493 | GnomeCanvasWidget *witem; |
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494 | |
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495 | witem = GNOME_CANVAS_WIDGET (item); |
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496 | |
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497 | if (witem->widget) |
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498 | gtk_widget_queue_draw (witem->widget); |
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499 | #endif |
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500 | } |
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501 | |
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502 | static double |
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503 | gnome_canvas_widget_point (GnomeCanvasItem *item, double x, double y, |
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504 | int cx, int cy, GnomeCanvasItem **actual_item) |
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505 | { |
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506 | GnomeCanvasWidget *witem; |
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507 | double x1, y1, x2, y2; |
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508 | double dx, dy; |
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509 | |
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510 | witem = GNOME_CANVAS_WIDGET (item); |
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511 | |
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512 | *actual_item = item; |
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513 | |
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514 | gnome_canvas_c2w (item->canvas, witem->cx, witem->cy, &x1, &y1); |
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515 | |
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516 | x2 = x1 + (witem->cwidth - 1) / item->canvas->pixels_per_unit; |
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517 | y2 = y1 + (witem->cheight - 1) / item->canvas->pixels_per_unit; |
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518 | |
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519 | /* Is point inside widget bounds? */ |
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520 | |
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521 | if ((x >= x1) && (y >= y1) && (x <= x2) && (y <= y2)) |
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522 | return 0.0; |
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523 | |
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524 | /* Point is outside widget bounds */ |
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525 | |
---|
526 | if (x < x1) |
---|
527 | dx = x1 - x; |
---|
528 | else if (x > x2) |
---|
529 | dx = x - x2; |
---|
530 | else |
---|
531 | dx = 0.0; |
---|
532 | |
---|
533 | if (y < y1) |
---|
534 | dy = y1 - y; |
---|
535 | else if (y > y2) |
---|
536 | dy = y - y2; |
---|
537 | else |
---|
538 | dy = 0.0; |
---|
539 | |
---|
540 | return sqrt (dx * dx + dy * dy); |
---|
541 | } |
---|
542 | |
---|
543 | static void |
---|
544 | gnome_canvas_widget_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2) |
---|
545 | { |
---|
546 | GnomeCanvasWidget *witem; |
---|
547 | |
---|
548 | witem = GNOME_CANVAS_WIDGET (item); |
---|
549 | |
---|
550 | *x1 = witem->x; |
---|
551 | *y1 = witem->y; |
---|
552 | |
---|
553 | switch (witem->anchor) { |
---|
554 | case GTK_ANCHOR_NW: |
---|
555 | case GTK_ANCHOR_W: |
---|
556 | case GTK_ANCHOR_SW: |
---|
557 | break; |
---|
558 | |
---|
559 | case GTK_ANCHOR_N: |
---|
560 | case GTK_ANCHOR_CENTER: |
---|
561 | case GTK_ANCHOR_S: |
---|
562 | *x1 -= witem->width / 2.0; |
---|
563 | break; |
---|
564 | |
---|
565 | case GTK_ANCHOR_NE: |
---|
566 | case GTK_ANCHOR_E: |
---|
567 | case GTK_ANCHOR_SE: |
---|
568 | *x1 -= witem->width; |
---|
569 | break; |
---|
570 | |
---|
571 | default: |
---|
572 | break; |
---|
573 | } |
---|
574 | |
---|
575 | switch (witem->anchor) { |
---|
576 | case GTK_ANCHOR_NW: |
---|
577 | case GTK_ANCHOR_N: |
---|
578 | case GTK_ANCHOR_NE: |
---|
579 | break; |
---|
580 | |
---|
581 | case GTK_ANCHOR_W: |
---|
582 | case GTK_ANCHOR_CENTER: |
---|
583 | case GTK_ANCHOR_E: |
---|
584 | *y1 -= witem->height / 2.0; |
---|
585 | break; |
---|
586 | |
---|
587 | case GTK_ANCHOR_SW: |
---|
588 | case GTK_ANCHOR_S: |
---|
589 | case GTK_ANCHOR_SE: |
---|
590 | *y1 -= witem->height; |
---|
591 | break; |
---|
592 | |
---|
593 | default: |
---|
594 | break; |
---|
595 | } |
---|
596 | |
---|
597 | *x2 = *x1 + witem->width; |
---|
598 | *y2 = *y1 + witem->height; |
---|
599 | } |
---|