gtktreeitem.c

gtk是linux一款强大的夸平台的图形化开发工具

/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * 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; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include "gtklabel.h"
#include "gtktree.h"
#include "gtktreeitem.h"
#include "gtkeventbox.h"
#include "gtkpixmap.h"
#include "gtkmain.h"
#include "gtksignal.h"

#include "tree_plus.xpm"
#include "tree_minus.xpm"

#define DEFAULT_DELTA 9

enum {
  COLLAPSE_TREE,
  EXPAND_TREE,
  LAST_SIGNAL
};

typedef struct _GtkTreePixmaps GtkTreePixmaps;

struct _GtkTreePixmaps {
  gint refcount;
  GdkColormap *colormap;
  
  GdkPixmap *pixmap_plus;
  GdkPixmap *pixmap_minus;
  GdkBitmap *mask_plus;
  GdkBitmap *mask_minus;
};

static GList *pixmaps = NULL;

static void gtk_tree_item_class_init (GtkTreeItemClass *klass);
static void gtk_tree_item_init       (GtkTreeItem      *tree_item);
static void gtk_tree_item_realize       (GtkWidget        *widget);
static void gtk_tree_item_size_request  (GtkWidget        *widget,
					 GtkRequisition   *requisition);
static void gtk_tree_item_size_allocate (GtkWidget        *widget,
					 GtkAllocation    *allocation);
static void gtk_tree_item_draw          (GtkWidget        *widget,
					 GdkRectangle     *area);
static void gtk_tree_item_draw_focus    (GtkWidget        *widget);
static void gtk_tree_item_paint         (GtkWidget        *widget,
					 GdkRectangle     *area);
static gint gtk_tree_item_button_press  (GtkWidget        *widget,
					 GdkEventButton   *event);
static gint gtk_tree_item_expose        (GtkWidget        *widget,
					 GdkEventExpose   *event);
static gint gtk_tree_item_focus_in      (GtkWidget        *widget,
					 GdkEventFocus    *event);
static gint gtk_tree_item_focus_out     (GtkWidget        *widget,
					 GdkEventFocus    *event);
static void gtk_tree_item_forall        (GtkContainer    *container,
					 gboolean         include_internals,
					 GtkCallback      callback,
					 gpointer         callback_data);

static void gtk_real_tree_item_select   (GtkItem          *item);
static void gtk_real_tree_item_deselect (GtkItem          *item);
static void gtk_real_tree_item_toggle   (GtkItem          *item);
static void gtk_real_tree_item_expand   (GtkTreeItem      *item);
static void gtk_real_tree_item_collapse (GtkTreeItem      *item);
static void gtk_real_tree_item_expand   (GtkTreeItem      *item);
static void gtk_real_tree_item_collapse (GtkTreeItem      *item);
static void gtk_tree_item_destroy        (GtkObject *object);
static void gtk_tree_item_subtree_button_click (GtkWidget *widget);
static void gtk_tree_item_subtree_button_changed_state (GtkWidget *widget);

static void gtk_tree_item_map(GtkWidget*);
static void gtk_tree_item_unmap(GtkWidget*);

static void gtk_tree_item_add_pixmaps    (GtkTreeItem       *tree_item);
static void gtk_tree_item_remove_pixmaps (GtkTreeItem       *tree_item);

static GtkItemClass *parent_class = NULL;
static guint tree_item_signals[LAST_SIGNAL] = { 0 };

GtkType
gtk_tree_item_get_type (void)
{
  static GtkType tree_item_type = 0;

  if (!tree_item_type)
    {
      static const GtkTypeInfo tree_item_info =
      {
	"GtkTreeItem",
	sizeof (GtkTreeItem),
	sizeof (GtkTreeItemClass),
	(GtkClassInitFunc) gtk_tree_item_class_init,
	(GtkObjectInitFunc) gtk_tree_item_init,
	/* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };

      tree_item_type = gtk_type_unique (gtk_item_get_type (), &tree_item_info);
    }

  return tree_item_type;
}

static void
gtk_tree_item_class_init (GtkTreeItemClass *class)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkContainerClass *container_class;
  GtkItemClass *item_class;

  object_class = (GtkObjectClass*) class;
  widget_class = (GtkWidgetClass*) class;
  item_class = (GtkItemClass*) class;
  container_class = (GtkContainerClass*) class;

  parent_class = gtk_type_class (gtk_item_get_type ());
  
  tree_item_signals[EXPAND_TREE] =
    gtk_signal_new ("expand",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkTreeItemClass, expand),
		    gtk_marshal_NONE__NONE,
		    GTK_TYPE_NONE, 0);
  tree_item_signals[COLLAPSE_TREE] =
    gtk_signal_new ("collapse",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkTreeItemClass, collapse),
		    gtk_marshal_NONE__NONE,
		    GTK_TYPE_NONE, 0);

  gtk_object_class_add_signals (object_class, tree_item_signals, LAST_SIGNAL);

  object_class->destroy = gtk_tree_item_destroy;

  widget_class->realize = gtk_tree_item_realize;
  widget_class->size_request = gtk_tree_item_size_request;
  widget_class->size_allocate = gtk_tree_item_size_allocate;
  widget_class->draw = gtk_tree_item_draw;
  widget_class->draw_focus = gtk_tree_item_draw_focus;
  widget_class->button_press_event = gtk_tree_item_button_press;
  widget_class->expose_event = gtk_tree_item_expose;
  widget_class->focus_in_event = gtk_tree_item_focus_in;
  widget_class->focus_out_event = gtk_tree_item_focus_out;
  widget_class->map = gtk_tree_item_map;
  widget_class->unmap = gtk_tree_item_unmap;

  container_class->forall = gtk_tree_item_forall;

  item_class->select = gtk_real_tree_item_select;
  item_class->deselect = gtk_real_tree_item_deselect;
  item_class->toggle = gtk_real_tree_item_toggle;

  class->expand = gtk_real_tree_item_expand;
  class->collapse = gtk_real_tree_item_collapse;
}

/* callback for event box mouse event */
static void 
gtk_tree_item_subtree_button_click (GtkWidget *widget)
{
  GtkTreeItem* item;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_EVENT_BOX (widget));
  
  item = (GtkTreeItem*) gtk_object_get_user_data (GTK_OBJECT (widget));
  if (!GTK_WIDGET_IS_SENSITIVE (item))
    return;
  
  if (item->expanded)
    gtk_tree_item_collapse (item);
  else
    gtk_tree_item_expand (item);
}

/* callback for event box state changed */
static void
gtk_tree_item_subtree_button_changed_state (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_EVENT_BOX (widget));
  
  if (GTK_WIDGET_VISIBLE (widget))
    {
      
      if (widget->state == GTK_STATE_NORMAL)
	gdk_window_set_background (widget->window, &widget->style->base[widget->state]);
      else
	gdk_window_set_background (widget->window, &widget->style->bg[widget->state]);
      
      if (GTK_WIDGET_DRAWABLE (widget))
	gdk_window_clear_area (widget->window, 0, 0, 
			       widget->allocation.width, widget->allocation.height);
    }
}

static void
gtk_tree_item_init (GtkTreeItem *tree_item)
{
  GtkWidget *eventbox, *pixmapwid;
  
  g_return_if_fail (tree_item != NULL);
  g_return_if_fail (GTK_IS_TREE_ITEM (tree_item));

  tree_item->expanded = FALSE;
  tree_item->subtree = NULL;
  GTK_WIDGET_SET_FLAGS (tree_item, GTK_CAN_FOCUS);
  
  /* create an event box containing one pixmaps */
  eventbox = gtk_event_box_new();
  gtk_widget_set_events (eventbox, GDK_BUTTON_PRESS_MASK);
  gtk_signal_connect(GTK_OBJECT(eventbox), "state_changed",
		     (GtkSignalFunc)gtk_tree_item_subtree_button_changed_state, 
		     (gpointer)NULL);
  gtk_signal_connect(GTK_OBJECT(eventbox), "realize",
		     (GtkSignalFunc)gtk_tree_item_subtree_button_changed_state, 
		     (gpointer)NULL);
  gtk_signal_connect(GTK_OBJECT(eventbox), "button_press_event",
		     (GtkSignalFunc)gtk_tree_item_subtree_button_click,
		     (gpointer)NULL);
  gtk_object_set_user_data(GTK_OBJECT(eventbox), tree_item);
  tree_item->pixmaps_box = eventbox;

  /* create pixmap for button '+' */
  pixmapwid = gtk_type_new (gtk_pixmap_get_type ());
  if (!tree_item->expanded) 
    gtk_container_add (GTK_CONTAINER (eventbox), pixmapwid);
  gtk_widget_show (pixmapwid);
  tree_item->plus_pix_widget = pixmapwid;
  gtk_widget_ref (tree_item->plus_pix_widget);
  gtk_object_sink (GTK_OBJECT (tree_item->plus_pix_widget));
  
  /* create pixmap for button '-' */
  pixmapwid = gtk_type_new (gtk_pixmap_get_type ());
  if (tree_item->expanded) 
    gtk_container_add (GTK_CONTAINER (eventbox), pixmapwid);
  gtk_widget_show (pixmapwid);
  tree_item->minus_pix_widget = pixmapwid;
  gtk_widget_ref (tree_item->minus_pix_widget);
  gtk_object_sink (GTK_OBJECT (tree_item->minus_pix_widget));
  
  gtk_widget_set_parent (eventbox, GTK_WIDGET (tree_item));
}


GtkWidget*
gtk_tree_item_new (void)
{
  GtkWidget *tree_item;

  tree_item = GTK_WIDGET (gtk_type_new (gtk_tree_item_get_type ()));

  return tree_item;
}

GtkWidget*
gtk_tree_item_new_with_label (gchar *label)
{
  GtkWidget *tree_item;
  GtkWidget *label_widget;

  tree_item = gtk_tree_item_new ();
  label_widget = gtk_label_new (label);
  gtk_misc_set_alignment (GTK_MISC (label_widget), 0.0, 0.5);

  gtk_container_add (GTK_CONTAINER (tree_item), label_widget);
  gtk_widget_show (label_widget);


  return tree_item;
}

void
gtk_tree_item_set_subtree (GtkTreeItem *tree_item,
			   GtkWidget   *subtree)
{
  g_return_if_fail (tree_item != NULL);
  g_return_if_fail (GTK_IS_TREE_ITEM (tree_item));
  g_return_if_fail (subtree != NULL);
  g_return_if_fail (GTK_IS_TREE (subtree));

  if (tree_item->subtree)
    {
      g_warning("there is already a subtree for this tree item\n");
      return;
    }

  tree_item->subtree = subtree; 
  GTK_TREE (subtree)->tree_owner = GTK_WIDGET (tree_item);

  /* show subtree button */
  if (tree_item->pixmaps_box)
    gtk_widget_show (tree_item->pixmaps_box);

  if (tree_item->expanded)
    gtk_widget_show (subtree);
  else
    gtk_widget_hide (subtree);

  gtk_widget_set_parent (subtree, GTK_WIDGET (tree_item)->parent);

  if (GTK_WIDGET_REALIZED (subtree->parent))
    gtk_widget_realize (subtree);

  if (GTK_WIDGET_VISIBLE (subtree->parent) && GTK_WIDGET_VISIBLE (subtree))
    {
      if (GTK_WIDGET_MAPPED (subtree->parent))
	gtk_widget_map (subtree);

      gtk_widget_queue_resize (subtree);
    }
}

void
gtk_tree_item_select (GtkTreeItem *tree_item)
{
  g_return_if_fail (tree_item != NULL);
  g_return_if_fail (GTK_IS_TREE_ITEM (tree_item));

  gtk_item_select (GTK_ITEM (tree_item));
}

void
gtk_tree_item_deselect (GtkTreeItem *tree_item)
{
  g_return_if_fail (tree_item != NULL);
  g_return_if_fail (GTK_IS_TREE_ITEM (tree_item));

  gtk_item_deselect (GTK_ITEM (tree_item));
}

void
gtk_tree_item_expand (GtkTreeItem *tree_item)
{
  g_return_if_fail (tree_item != NULL);
  g_return_if_fail (GTK_IS_TREE_ITEM (tree_item));

  gtk_signal_emit (GTK_OBJECT (tree_item), tree_item_signals[EXPAND_TREE], NULL);
}

void
gtk_tree_item_collapse (GtkTreeItem *tree_item)
{