source: trunk/third/gtkhtml3/src/htmlframe.c @ 21116

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* This file is part of the GtkHTML library.
   
   Copyright (C) 2000 Helix Code, Inc.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
   
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.
   
   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.
*/

#include <config.h>
#include <gtk/gtk.h>
#include <string.h>
#include "gtkhtml.h"
#include "gtkhtml-stream.h"
#include "htmltokenizer.h"
#include "gtkhtml-private.h"
#include "htmlcolorset.h"
#include "htmlgdkpainter.h"
#include "htmlprinter.h"
#include "htmlframe.h"
#include "htmlengine-search.h"
#include "htmlsearch.h"
#include "htmlselection.h"
#include "htmlsettings.h"

HTMLFrameClass html_frame_class;
static HTMLEmbeddedClass *parent_class = NULL;

static void
frame_url_requested (GtkHTML *html, const char *url, GtkHTMLStream *handle, gpointer data)
{
        HTMLFrame *frame = HTML_FRAME (data);
        GtkHTML *parent = GTK_HTML (HTML_EMBEDDED(frame)->parent);

        if (!html->engine->stopped)
                g_signal_emit_by_name (parent->engine, "url_requested", url, handle);
}

static void
frame_set_base (GtkHTML *html, const gchar *url, gpointer data)
{
        char *new_url = NULL;

        new_url = gtk_html_get_url_base_relative (html, url);
        gtk_html_set_base (html, new_url);
        g_free (new_url);
}

static void
frame_submit (GtkHTML *html, 
              const gchar *method, 
              const gchar *action, 
              const gchar *encoding, 
              gpointer data) 
{
        HTMLFrame *frame = HTML_FRAME (data);
        GtkHTML *parent = GTK_HTML (HTML_EMBEDDED(frame)->parent);

        g_signal_emit_by_name (parent, "submit", method, action, encoding);
}

static void
frame_size_changed (GtkHTML *html, gpointer data)
{
        HTMLFrame *frame = HTML_FRAME (data);
        GtkHTML *parent = GTK_HTML (HTML_EMBEDDED(frame)->parent);
        
        html_engine_schedule_update (parent->engine);
}

static gboolean
frame_object_requested (GtkHTML *html, GtkHTMLEmbedded *eb, gpointer data)
{
        HTMLFrame *frame = HTML_FRAME (data);
        GtkHTML *parent = GTK_HTML (HTML_EMBEDDED(frame)->parent);
        gboolean ret_val;

        ret_val = FALSE;
        g_signal_emit_by_name (parent, "object_requested", eb, &ret_val);
        return ret_val;
}

static void
frame_set_gdk_painter (HTMLFrame *frame, HTMLPainter *painter)
{
        if (painter)
                g_object_ref (G_OBJECT (painter));
        
        if (frame->gdk_painter)
                g_object_unref (G_OBJECT (frame->gdk_painter));

        frame->gdk_painter = painter;
}

HTMLObject *
html_frame_new (GtkWidget *parent, 
                 char *src, 
                 gint width, 
                 gint height,
                 gboolean border) 
{
        HTMLFrame *frame;
        
        frame = g_new (HTMLFrame, 1);
        
        html_frame_init (frame, 
                          &html_frame_class, 
                          parent,
                          src,
                          width,
                          height,
                          border);
        
        return HTML_OBJECT (frame);
}

static gboolean
html_frame_grab_cursor(GtkWidget *frame, GdkEvent *event)
{
        /* Keep the focus! Fight the power */
        return TRUE;
}

static gint
calc_min_width (HTMLObject *o,
                HTMLPainter *painter)
{
  int min_width;
  
  if (HTML_FRAME (o)->width < 0)
          min_width =  html_engine_calc_min_width (GTK_HTML (HTML_FRAME (o)->html)->engine);
  else 
          min_width = HTML_FRAME (o)->width;

  return min_width;
}

static void
set_max_width (HTMLObject *o, HTMLPainter *painter, gint max_width)
{
        HTMLEngine *e = GTK_HTML (HTML_FRAME (o)->html)->engine;

        o->max_width = max_width;
        html_object_set_max_width (e->clue, e->painter, max_width - (html_engine_get_left_border (e) + html_engine_get_right_border (e)));
}

static void
draw (HTMLObject *o,
      HTMLPainter *p,
      gint x, gint y,
      gint width, gint height,
      gint tx, gint ty)
{
        HTMLFrame   *frame  = HTML_FRAME (o);
        HTMLEngine   *e       = GTK_HTML (frame->html)->engine;
        GdkRectangle paint;

        if (GTK_OBJECT_TYPE (e->painter) == HTML_TYPE_PRINTER) {
                gint pixel_size = html_painter_get_pixel_size (e->painter);

                if (!html_object_intersect (o, &paint, x, y, width, height))
                        return;

                html_object_draw (e->clue, e->painter,
                                  x, y,
                                  width - pixel_size * (html_engine_get_left_border (e) + html_engine_get_right_border (e)),
                                  height - pixel_size * (html_engine_get_top_border (e) + html_engine_get_bottom_border (e)),
                                  tx + pixel_size * html_engine_get_left_border (e), ty + pixel_size * html_engine_get_top_border (e));
        } else
                (*HTML_OBJECT_CLASS (parent_class)->draw) (o, p, x, y, width, height, tx, ty);
}

static void
set_painter (HTMLObject *o, HTMLPainter *painter)
{
        HTMLFrame *frame;

        frame = HTML_FRAME (o);
        if (G_OBJECT_TYPE (GTK_HTML (frame->html)->engine->painter) != HTML_TYPE_PRINTER) {
                frame_set_gdk_painter (frame, GTK_HTML (frame->html)->engine->painter);
        }
        
        html_engine_set_painter (GTK_HTML (frame->html)->engine,
                                 GTK_OBJECT_TYPE (painter) != HTML_TYPE_PRINTER ? frame->gdk_painter : painter);
}

static void
forall (HTMLObject *self,
        HTMLEngine *e,
        HTMLObjectForallFunc func,
        gpointer data)
{
        HTMLFrame *frame;

        frame = HTML_FRAME (self);
        (* func) (self, html_object_get_engine (self, e), data);
        html_object_forall (GTK_HTML (frame->html)->engine->clue, html_object_get_engine (self, e), func, data);
}

static gint
check_page_split (HTMLObject *self, HTMLPainter *p, gint y)
{
        return html_object_check_page_split (GTK_HTML (HTML_FRAME (self)->html)->engine->clue, p, y);
}

static gboolean
html_frame_real_calc_size (HTMLObject *o, HTMLPainter *painter, GList **changed_objs)
{
        HTMLFrame *frame;
        HTMLEngine *e;
        gint old_width, old_ascent, old_descent;
        
        old_width = o->width;
        old_ascent = o->ascent;
        old_descent = o->descent;

        frame = HTML_FRAME (o);
        e     = GTK_HTML (frame->html)->engine;

        if ((frame->width < 0) && (frame->height < 0)) {
                if (e->clue) {
                        html_engine_calc_size (e, changed_objs);
                        e->width = html_engine_get_doc_width (e);
                        e->height = html_engine_get_doc_height (e);
                }
                html_frame_set_scrolling (frame, GTK_POLICY_NEVER);

                o->width = e->width;
                o->ascent = e->height;
                o->descent = 0;
        } else
                return (* HTML_OBJECT_CLASS (parent_class)->calc_size) (o, painter, changed_objs);

        if (o->descent != old_descent
            || o->ascent != old_ascent
            || o->width != old_width)
                return TRUE;

        return FALSE;
}

static gboolean
search (HTMLObject *self, HTMLSearch *info)
{
        HTMLEngine *e = GTK_HTML (HTML_FRAME (self)->html)->engine;

        /* printf ("search\n"); */

        /* search_next? */
        if (info->stack && HTML_OBJECT (info->stack->data) == e->clue) {
                /* printf ("next\n"); */
                info->engine = GTK_HTML (GTK_HTML (HTML_FRAME (self)->html)->iframe_parent)->engine;
                html_search_pop (info);
                html_engine_unselect_all (e);
                return html_search_next_parent (info);
        }

        info->engine = e;
        html_search_push (info, e->clue);
        if (html_object_search (e->clue, info))
                return TRUE;
        html_search_pop (info);

        info->engine = GTK_HTML (GTK_HTML (HTML_FRAME (self)->html)->iframe_parent)->engine;
        /* printf ("FALSE\n"); */

        return FALSE;
}

static HTMLObject *
head (HTMLObject *self)
{
        return GTK_HTML (HTML_FRAME (self)->html)->engine->clue;
}

static HTMLObject *
tail (HTMLObject *self)
{
        return GTK_HTML (HTML_FRAME (self)->html)->engine->clue;
}

static HTMLEngine *
get_engine (HTMLObject *self, HTMLEngine *e)
{
        return GTK_HTML (HTML_FRAME (self)->html)->engine;
}

static HTMLObject*
check_point (HTMLObject *self,
             HTMLPainter *painter,
             gint x, gint y,
             guint *offset_return,
             gboolean for_cursor)
{
        HTMLEngine *e = GTK_HTML (HTML_FRAME (self)->html)->engine;

        if (x < self->x || x >= self->x + self->width
            || y >= self->y + self->descent || y < self->y - self->ascent)
                return NULL;

        x -= self->x + html_engine_get_left_border (e) - e->x_offset;
        y -= self->y - self->ascent + html_engine_get_top_border (e) - e->y_offset;

        if (for_cursor && (x < 0 || y < e->clue->y - e->clue->ascent))
                return html_object_check_point (e->clue, e->painter, 0, e->clue->y - e->clue->ascent,
                                                offset_return, for_cursor);

        if (for_cursor && (x > e->clue->width - 1 || y > e->clue->y + e->clue->descent - 1))
                return html_object_check_point (e->clue, e->painter, e->clue->width - 1, e->clue->y + e->clue->descent - 1,
                                                offset_return, for_cursor);

        return html_object_check_point (e->clue, e->painter, x, y, offset_return, for_cursor);
}

static gboolean
is_container (HTMLObject *self)
{
        return TRUE;
}

static void
append_selection_string (HTMLObject *self,
                         GString *buffer)
{
        html_object_append_selection_string (GTK_HTML (HTML_FRAME (self)->html)->engine->clue, buffer);
}

static void
reparent (HTMLEmbedded *emb, GtkWidget *html)
{
        HTMLFrame *frame = HTML_FRAME (emb);

        gtk_html_set_iframe_parent (GTK_HTML (frame->html), 
                                    html,
                                    GTK_HTML (frame->html)->frame);
        (* HTML_EMBEDDED_CLASS (parent_class)->reparent) (emb, html);
}

static gboolean
select_range (HTMLObject *self,
              HTMLEngine *engine,
              guint start,
              gint length,
              gboolean queue_draw)
{
        return html_object_select_range (GTK_HTML (HTML_FRAME (self)->html)->engine->clue,
                                         GTK_HTML (HTML_FRAME (self)->html)->engine,
                                         start, length, queue_draw);
}

static void
destroy (HTMLObject *o)
{
        HTMLFrame *frame = HTML_FRAME (o);

        frame_set_gdk_painter (frame, NULL);

        if (frame->html) {
                g_signal_handlers_disconnect_matched (frame->html, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, o);
                frame->html = NULL;
        }
        g_free ((frame)->url);

        HTML_OBJECT_CLASS (parent_class)->destroy (o);
}

void
html_frame_set_margin_width (HTMLFrame *frame, gint margin_width)
{
        HTMLEngine *e;

        e = GTK_HTML (frame->html)->engine;

        e->leftBorder = e->rightBorder = margin_width;
        html_engine_schedule_redraw (e);
}

void
html_frame_set_margin_height (HTMLFrame *frame, gint margin_height)
{
        HTMLEngine *e;

        e = GTK_HTML (frame->html)->engine;

        e->bottomBorder = e->topBorder = margin_height;
        html_engine_schedule_redraw (e);
}

void
html_frame_set_scrolling (HTMLFrame *frame, GtkPolicyType scroll)
{

        gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (frame->scroll),
                                        scroll, scroll);
}

void
html_frame_set_size (HTMLFrame *frame, gint width, gint height)
{
        g_return_if_fail (frame != NULL);

        if (width > 0)
                frame->width = width;

        if (height > 0)
                frame->height = height;
        
        gtk_widget_set_size_request (frame->scroll, width, height);
}

void 
html_frame_init (HTMLFrame *frame,
                  HTMLFrameClass *klass,
                  GtkWidget *parent,
                  char *src,
                  gint width,
                  gint height,
                  gboolean border)
{
        HTMLEmbedded *em = HTML_EMBEDDED (frame);
        HTMLTokenizer *new_tokenizer;
        GtkWidget *new_widget;
        GtkHTML   *new_html;
        GtkHTML   *parent_html;
        GtkWidget *scrolled_window;
        gint depth;

        g_assert (GTK_IS_HTML (parent));
        parent_html = GTK_HTML (parent);

        html_embedded_init (em, HTML_EMBEDDED_CLASS (klass),
                            parent, NULL, NULL);
        
        scrolled_window = gtk_scrolled_window_new (NULL, NULL);
        gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (scrolled_window),
                                             border ? GTK_SHADOW_IN : GTK_SHADOW_NONE);

        new_widget = gtk_html_new ();
        new_html = GTK_HTML (new_widget);

        new_tokenizer = html_tokenizer_clone (parent_html->engine->ht);

        html_engine_set_tokenizer (new_html->engine, new_tokenizer);
        g_object_unref (G_OBJECT (new_tokenizer));
        new_tokenizer = NULL;

        gtk_html_set_default_content_type (new_html,
                                           parent_html->priv->content_type);
        frame->html = new_widget;
        frame->url = g_strdup (src);
        frame->width = width;
        frame->height = height;
        frame->gdk_painter = NULL;
        gtk_html_set_base (new_html, src);
        depth = gtk_html_set_iframe_parent (new_html, parent, HTML_OBJECT (frame));
        gtk_container_add (GTK_CONTAINER (scrolled_window), new_widget);
        gtk_widget_show (new_widget);

        g_signal_connect (new_html, "url_requested", G_CALLBACK (frame_url_requested), frame);

        if (parent_html->engine->stopped) {
                gtk_html_stop (new_html);
                gtk_html_load_empty (new_html);
        } else {
                GtkHTMLStream *handle;

                handle = gtk_html_begin (new_html);
                g_signal_emit_by_name (parent_html->engine, "url_requested", src, handle);
        }

        new_html->engine->clue->parent = HTML_OBJECT (frame);

#if 0
        /* NOTE: because of peculiarities of the frame/gtkhtml relationship
         * on_url and link_clicked are emitted from the toplevel widget not
         * proxied like url_requested is.
         */
        gtk_signal_connect (GTK_OBJECT (new_html), "on_url",
                            GTK_SIGNAL_FUNC (frame_on_url), 
                            (gpointer)frame);
        gtk_signal_connect (GTK_OBJECT (new_html), "link_clicked",
                            GTK_SIGNAL_FUNC (frame_link_clicked),
                            (gpointer)frame);   
#endif
        g_signal_connect (new_html, "size_changed", G_CALLBACK (frame_size_changed), frame);    
        g_signal_connect (new_html, "object_requested", G_CALLBACK (frame_object_requested), frame);    
        g_signal_connect (new_html, "submit", G_CALLBACK (frame_submit), frame);
        g_signal_connect (new_html, "set_base", G_CALLBACK (frame_set_base), frame);

        html_frame_set_margin_height (frame, 0);
        html_frame_set_margin_width (frame, 0);

        /*
          gtk_signal_connect (GTK_OBJECT (html), "button_press_event",
          GTK_SIGNAL_FUNC (frame_button_press_event), frame);
        */

        gtk_widget_set_size_request (scrolled_window, width, height);

        gtk_widget_show (scrolled_window);      
        frame->scroll = scrolled_window;
        html_frame_set_scrolling (frame, GTK_POLICY_AUTOMATIC);

        html_embedded_set_widget (em, scrolled_window);

        g_signal_connect (scrolled_window, "button_press_event", G_CALLBACK (html_frame_grab_cursor), NULL);

        /* inherit the current colors from our parent */
        html_colorset_set_unchanged (new_html->engine->defaultSettings->color_set,
                                     parent_html->engine->settings->color_set);
        html_colorset_set_unchanged (new_html->engine->settings->color_set,
                                     parent_html->engine->settings->color_set);
        html_painter_set_focus (new_html->engine->painter, parent_html->engine->have_focus);
        /*
        g_signal_connect (html, "title_changed", G_CALLBACK (title_changed_cb), app);
        g_signal_connect (html, "button_press_event", G_CALLBACK (on_button_press_event), popup_menu);
        g_signal_connect (html, "redirect", G_CALLBACK (on_redirect), NULL);
        g_signal_connect (html, "object_requested", G_CALLBACK (object_requested_cmd), NULL);
        */
}

void
html_frame_type_init (void)
{
        html_frame_class_init (&html_frame_class, HTML_TYPE_FRAME, sizeof (HTMLFrame));
}

void
html_frame_class_init (HTMLFrameClass *klass,
                        HTMLType type,
                        guint size) 
{
        HTMLEmbeddedClass *embedded_class;
        HTMLObjectClass  *object_class;

        g_return_if_fail (klass != NULL);
        
        embedded_class = HTML_EMBEDDED_CLASS (klass);
        object_class = HTML_OBJECT_CLASS (klass);

        html_embedded_class_init (embedded_class, type, size);
        parent_class = &html_embedded_class;

        object_class->destroy                 = destroy;
        object_class->calc_size               = html_frame_real_calc_size;
        object_class->calc_min_width          = calc_min_width;
        object_class->set_painter             = set_painter;
        /* object_class->reset                   = reset; */
        object_class->draw                    = draw;
        object_class->set_max_width           = set_max_width;
        object_class->forall                  = forall;
        object_class->check_page_split        = check_page_split;
        object_class->search                  = search;
        object_class->head                    = head;
        object_class->tail                    = tail;
        object_class->get_engine              = get_engine;
        object_class->check_point             = check_point;
        object_class->is_container            = is_container;
        object_class->append_selection_string = append_selection_string;
        object_class->select_range            = select_range;

        embedded_class->reparent = reparent;
}