dw_gtk_viewport.c

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/*
 * File: dw_gtk_viewport.c
 *
 * Copyright (C) 2001-2003  Sebastian Geerken <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <gtk/gtk.h>
#include "msg.h"
#include "dw_gtk_viewport.h"
#include "dw_container.h"
#include "list.h"

/*#define DEBUG_LEVEL 1*/
#include "debug.h"
#include "msg.h"

typedef struct
{
   DwWidget *widget;
   gint32 y;
} GtkDwViewportAnchor;

static GtkLayoutClass *parent_class = NULL;

/* object/class initialisation */
static void Dw_gtk_viewport_init          (GtkDwViewport *viewport);
static void Dw_gtk_viewport_class_init    (GtkDwViewportClass *klass);

/* GtkObject methods */
static void Dw_gtk_viewport_destroy       (GtkObject *object);

/* GtkWidget methods */
static void Dw_gtk_viewport_size_allocate (GtkWidget *widget,
                                           GtkAllocation *allocation);
static void Dw_gtk_viewport_realize       (GtkWidget *widget);
static void Dw_gtk_viewport_unrealize     (GtkWidget *widget);
static void Dw_gtk_viewport_draw          (GtkWidget *widget,
                                           GdkRectangle *area);
static gint Dw_gtk_viewport_expose        (GtkWidget *widget,
                                           GdkEventExpose *event);
static gint Dw_gtk_viewport_button_press  (GtkWidget *widget,
                                           GdkEventButton *event);
static gint Dw_gtk_viewport_button_release(GtkWidget *widget,
                                           GdkEventButton *event);
static gint Dw_gtk_viewport_motion_notify (GtkWidget *widget,
                                           GdkEventMotion *event);
static gint Dw_gtk_viewport_enter_notify  (GtkWidget *widget,
                                           GdkEventCrossing *event);
static gint Dw_gtk_viewport_leave_notify  (GtkWidget *widget,
                                           GdkEventCrossing *event);
static void Dw_gtk_viewport_adj_changed   (GtkAdjustment *adj,
                                           GtkDwViewport *viewport);

/*
 * Standard Gtk+ function
 */
GtkType a_Dw_gtk_viewport_get_type (void)
{
   static GtkType type = 0;

   if (!type) {
      GtkTypeInfo info = {
         "GtkDwViewport",
         sizeof (GtkDwViewport),
         sizeof (GtkDwViewportClass),
         (GtkClassInitFunc) Dw_gtk_viewport_class_init,
         (GtkObjectInitFunc) Dw_gtk_viewport_init,
         (GtkArgSetFunc) NULL,
         (GtkArgGetFunc) NULL,
         (GtkClassInitFunc) NULL
      };

      type = gtk_type_unique (GTK_TYPE_LAYOUT, &info);
   }

   return type;
}


/*
 * Standard Gtk+ function
 */
GtkWidget* a_Dw_gtk_viewport_new (GtkAdjustment *hadjustment,
                                  GtkAdjustment *vadjustment)
{
   GtkWidget *widget;

   widget = gtk_widget_new (GTK_TYPE_DW_VIEWPORT, NULL);
   gtk_layout_set_hadjustment (GTK_LAYOUT (widget), hadjustment);
   gtk_layout_set_vadjustment (GTK_LAYOUT (widget), vadjustment);

   /* Following two statements expect that the adjustments are passed as
    * arguments (!= NULL), and don't change. This is the case in dillo,
    * however, for more general perposes, the signal function
    * "set_scroll_adjustments" had to be redefined.
    */
   gtk_signal_connect (GTK_OBJECT (hadjustment), "value_changed",
                       GTK_SIGNAL_FUNC (Dw_gtk_viewport_adj_changed),
                       (gpointer) widget);
   gtk_signal_connect (GTK_OBJECT (vadjustment), "value_changed",
                       GTK_SIGNAL_FUNC (Dw_gtk_viewport_adj_changed),
                       (gpointer) widget);

   return widget;
}

/*********************************
 *                               *
 *  object/class initialisation  *
 *                               *
 *********************************/

/*
 * Standard Gtk+ function
 */
static void Dw_gtk_viewport_init (GtkDwViewport *viewport)
{
   DBG_OBJ_CREATE (viewport, "GtkDwViewport");

   GTK_WIDGET_UNSET_FLAGS (viewport, GTK_NO_WINDOW);
   GTK_WIDGET_UNSET_FLAGS (viewport, GTK_CAN_FOCUS);

   /* Without this, gtk_layout_{draw|expose} will clear the window.
      Look at gtklayout.c */
   GTK_WIDGET_SET_FLAGS (viewport, GTK_APP_PAINTABLE);

   viewport->back_pixmap = NULL;
   viewport->child = NULL;
   viewport->last_entered = NULL;
   viewport->draw_resize_idle_id = 0;
   viewport->anchor = NULL;
   viewport->anchor_idle_id = 0;
   viewport->findtext_state = a_Findtext_state_new ();
   viewport->selection = a_Selection_new ();
   viewport->anchors_table = g_hash_table_new (g_str_hash, g_str_equal);
   viewport->draw_areas = NULL;
   viewport->num_draw_areas = 0;
   viewport->num_draw_areas_max = 4;

   DBG_OBJ_ASSOC (viewport->findtext_state, viewport);
   DBG_OBJ_ASSOC (viewport->selection, viewport);
}


/*
 * Standard Gtk+ function
 */
static void Dw_gtk_viewport_class_init (GtkDwViewportClass *klass)
{
   GtkObjectClass *object_class;
   GtkWidgetClass *widget_class;

   parent_class = gtk_type_class (gtk_layout_get_type ());

   object_class = (GtkObjectClass*) klass;
   widget_class = (GtkWidgetClass*) klass;

   object_class->destroy = Dw_gtk_viewport_destroy;

   widget_class->size_allocate = Dw_gtk_viewport_size_allocate;
   widget_class->realize = Dw_gtk_viewport_realize;
   widget_class->unrealize = Dw_gtk_viewport_unrealize;
   widget_class->draw = Dw_gtk_viewport_draw;
   widget_class->expose_event = Dw_gtk_viewport_expose;
   widget_class->button_press_event = Dw_gtk_viewport_button_press;
   widget_class->button_release_event = Dw_gtk_viewport_button_release;
   widget_class->motion_notify_event = Dw_gtk_viewport_motion_notify;
   widget_class->enter_notify_event = Dw_gtk_viewport_enter_notify;
   widget_class->leave_notify_event = Dw_gtk_viewport_leave_notify;
}


/***********************
 *                     *
 *  GtkObject methods  *
 *                     *
 ***********************/

static gboolean Dw_gtk_viewport_destroy_anchor (gpointer key,
                                                gpointer value,
                                                gpointer user_data)
{
   g_free (value);
   return TRUE;
}

/*
 * Standard Gtk+ function
 */
static void Dw_gtk_viewport_destroy (GtkObject *object)
{
   GtkDwViewport *viewport;

   viewport = GTK_DW_VIEWPORT (object);

   if (viewport->back_pixmap)
      gdk_pixmap_unref (viewport->back_pixmap);
   if (viewport->child)
      gtk_object_destroy (GTK_OBJECT (viewport->child));
   if (viewport->draw_resize_idle_id != 0)
      gtk_idle_remove (viewport->draw_resize_idle_id);
   if (viewport->anchor_idle_id != 0)
      gtk_idle_remove (viewport->anchor_idle_id);
   g_free (viewport->anchor);

   g_hash_table_foreach_remove (viewport->anchors_table,
                                Dw_gtk_viewport_destroy_anchor, NULL);
   g_hash_table_destroy (viewport->anchors_table);

   g_free (viewport->draw_areas);

   a_Findtext_state_destroy (viewport->findtext_state);
   a_Selection_free (viewport->selection);

   GTK_OBJECT_CLASS(parent_class)->destroy (object);
}


/***********************
 *                     *
 *  GtkWidget methods  *
 *                     *
 ***********************/

/*
 * Standard Gtk+ function
 */
static void Dw_gtk_viewport_size_allocate (GtkWidget *widget,
                                           GtkAllocation *allocation)
{
   GTK_WIDGET_CLASS(parent_class)->size_allocate (widget, allocation);

   /* gtk_layout_size_allocate() sets them to different values. */
   GTK_LAYOUT(widget)->hadjustment->page_increment = allocation->width;
   GTK_LAYOUT(widget)->vadjustment->page_increment = 0.96 * allocation->height;
}

/*
 * Standard Gtk+ function
 */
static void Dw_gtk_viewport_realize (GtkWidget *widget)
{
   GtkDwViewport *viewport;

   GTK_WIDGET_CLASS(parent_class)->realize (widget);

   gdk_window_set_events (widget->window,
                          gdk_window_get_events (widget->window)
                          | GDK_BUTTON_PRESS_MASK
                          | GDK_BUTTON_RELEASE_MASK
                          | GDK_POINTER_MOTION_MASK
                          | GDK_ENTER_NOTIFY_MASK
                          | GDK_LEAVE_NOTIFY_MASK);

   viewport = GTK_DW_VIEWPORT (widget);
   if (viewport->child)
      a_Dw_widget_realize (viewport->child);
   gdk_window_get_geometry (widget->window, NULL, NULL, NULL, NULL,
                            &viewport->depth);
}


/*
 * Standard Gtk+ function
 */
static void Dw_gtk_viewport_unrealize (GtkWidget *widget)
{
   GtkDwViewport *viewport;

   GTK_WIDGET_CLASS(parent_class)->unrealize (widget);

   viewport = GTK_DW_VIEWPORT (widget);
   if (viewport->child)
      a_Dw_widget_unrealize (viewport->child);
}


/*
 * (Nearly) standard Gtk+ function
 */
static void Dw_gtk_viewport_paint (GtkWidget *widget,
                                   GdkRectangle *area,
                                   GdkEventExpose *event)
{
   GtkLayout *layout;
   DwRectangle parent_area, child_area, intersection;
   GtkDwViewport *viewport;
   gboolean new_back_pixmap;

   if (GTK_WIDGET_DRAWABLE (widget)) {
      layout = GTK_LAYOUT (widget);
      viewport = GTK_DW_VIEWPORT (widget);

      DEBUG_MSG (2, "Drawing (%d, %d), %d x %d\n",
                 area->x, area->y, area->width, area->height);

      /* Make sure the backing pixmap is large enough. */
      if (viewport->child) {
         if (viewport->back_pixmap)
            new_back_pixmap =
               (widget->allocation.width > viewport->back_width ||
                widget->allocation.height > viewport->back_height);
         else
            new_back_pixmap = TRUE;

         if (new_back_pixmap) {
            if (viewport->back_pixmap)
               gdk_pixmap_unref (viewport->back_pixmap);
            viewport->back_pixmap = gdk_pixmap_new (widget->window,
                                                    widget->allocation.width,
                                                    widget->allocation.height,
                                                    viewport->depth);
            viewport->back_width = widget->allocation.width;
            viewport->back_height = widget->allocation.height;
            DEBUG_MSG (1, "   Creating new pixmap, size = %d x %d\n",
                       widget->allocation.width, widget->allocation.height);
         }

         /* Draw top-level Dw widget. */
         parent_area.x =
            p_Dw_widget_x_viewport_to_world (viewport->child, area->x);
         parent_area.y =
            p_Dw_widget_y_viewport_to_world (viewport->child, area->y);
         parent_area.width = area->width;
         parent_area.height = area->height;

         child_area.x = viewport->child->allocation.x;
         child_area.y = viewport->child->allocation.y;
         child_area.width = viewport->child->allocation.width;
         child_area.height = DW_WIDGET_HEIGHT(viewport->child);

         if (p_Dw_rectangle_intersect (&parent_area, &child_area,
                                       &intersection)) {
            intersection.x -= viewport->child->allocation.x;
            intersection.y -= viewport->child->allocation.y;

            /* "Clear" backing pixmap. */
            gdk_draw_rectangle (viewport->back_pixmap,
                                viewport->child->style->background_color->gc,
                                TRUE, area->x, area->y,
                                area->width, area->height);
            /* Widgets draw in backing pixmap. */
            a_Dw_widget_draw (viewport->child, &intersection, event);
            /* Copy backing pixmap into window. */
            gdk_draw_pixmap (layout->bin_window, widget->style->black_gc,
                             viewport->back_pixmap, area->x, area->y,
                             area->x, area->y, area->width, area->height);
         }
      } else
         gdk_window_clear_area (layout->bin_window,
                                area->x, area->y, area->width, area->height);
   }
}


/*
 * Standard Gtk+ function
 */
static void Dw_gtk_viewport_draw (GtkWidget *widget,
                                  GdkRectangle *area)
{
   Dw_gtk_viewport_paint (widget, area, NULL);
   GTK_WIDGET_CLASS(parent_class)->draw (widget, area);
}


/*
 * Standard Gtk+ function
 */
static gint Dw_gtk_viewport_expose (GtkWidget *widget,
                                    GdkEventExpose *event)
{
   Dw_gtk_viewport_paint (widget, &(event->area), event);
   return GTK_WIDGET_CLASS(parent_class)->expose_event (widget, event);
}


/*
 * Handle the mouse event and deliver it to the Dw widget.
 * Most is done in a_Dw_widget_mouse_event.
 */
static gint Dw_gtk_viewport_mouse_event (GtkWidget *widget,
                                         gint32 x,
                                         gint32 y,
                                         GdkEvent *event)
{
   GtkDwViewport *viewport;
   DwWidget *dw_widget;
   gint32 world_x, world_y;

   if (event == NULL || event->any.window == widget->window) {
      viewport = GTK_DW_VIEWPORT (widget);
      if (viewport->child) {
         world_x = x + gtk_layout_get_hadjustment(GTK_LAYOUT(viewport))->value;