gtk2/gtk/gtktooltips.c
Matthias Clasen aa16f8e09b Don't crash if active_tips_data is NULL. (#382904, Li Yuan)
2007-03-11  Matthias Clasen  <mclasen@redhat.com>

        * gtk/gtktooltips.c (gtk_tooltips_get_info_from_tip_window):
        Don't crash if active_tips_data is NULL.  (#382904, Li Yuan)

2

svn path=/trunk/; revision=17483
2007-03-12 02:51:40 +00:00

789 lines
21 KiB
C

/* 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 Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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 1997-2000. 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 <config.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "gtklabel.h"
#include "gtkmain.h"
#include "gtkmenuitem.h"
#include "gtkprivate.h"
#include "gtkwidget.h"
#include "gtkwindow.h"
#include "gtkstyle.h"
#include "gtktooltips.h"
#include "gtkintl.h"
#include "gtkalias.h"
#define DEFAULT_DELAY 500 /* Default delay in ms */
#define STICKY_DELAY 0 /* Delay before popping up next tip
* if we're sticky
*/
#define STICKY_REVERT_DELAY 1000 /* Delay before sticky tooltips revert
* to normal
*/
static void gtk_tooltips_destroy (GtkObject *object);
static void gtk_tooltips_event_handler (GtkWidget *widget,
GdkEvent *event);
static void gtk_tooltips_widget_unmap (GtkWidget *widget,
gpointer data);
static void gtk_tooltips_widget_remove (GtkWidget *widget,
gpointer data);
static void gtk_tooltips_set_active_widget (GtkTooltips *tooltips,
GtkWidget *widget);
static gint gtk_tooltips_timeout (gpointer data);
static gint gtk_tooltips_paint_window (GtkTooltips *tooltips);
static void gtk_tooltips_draw_tips (GtkTooltips *tooltips);
static void gtk_tooltips_unset_tip_window (GtkTooltips *tooltips);
static gboolean get_keyboard_mode (GtkWidget *widget);
static const gchar tooltips_data_key[] = "_GtkTooltipsData";
static const gchar tooltips_info_key[] = "_GtkTooltipsInfo";
G_DEFINE_TYPE (GtkTooltips, gtk_tooltips, GTK_TYPE_OBJECT)
static void
gtk_tooltips_class_init (GtkTooltipsClass *class)
{
GtkObjectClass *object_class;
object_class = (GtkObjectClass*) class;
object_class->destroy = gtk_tooltips_destroy;
}
static void
gtk_tooltips_init (GtkTooltips *tooltips)
{
tooltips->tip_window = NULL;
tooltips->active_tips_data = NULL;
tooltips->tips_data_list = NULL;
tooltips->delay = DEFAULT_DELAY;
tooltips->enabled = TRUE;
tooltips->timer_tag = 0;
tooltips->use_sticky_delay = FALSE;
tooltips->last_popdown.tv_sec = -1;
tooltips->last_popdown.tv_usec = -1;
}
GtkTooltips *
gtk_tooltips_new (void)
{
return g_object_new (GTK_TYPE_TOOLTIPS, NULL);
}
static void
gtk_tooltips_destroy_data (GtkTooltipsData *tooltipsdata)
{
g_free (tooltipsdata->tip_text);
g_free (tooltipsdata->tip_private);
g_signal_handlers_disconnect_by_func (tooltipsdata->widget,
gtk_tooltips_event_handler,
tooltipsdata);
g_signal_handlers_disconnect_by_func (tooltipsdata->widget,
gtk_tooltips_widget_unmap,
tooltipsdata);
g_signal_handlers_disconnect_by_func (tooltipsdata->widget,
gtk_tooltips_widget_remove,
tooltipsdata);
g_object_set_data (G_OBJECT (tooltipsdata->widget), I_(tooltips_data_key), NULL);
g_object_unref (tooltipsdata->widget);
g_free (tooltipsdata);
}
static void
tip_window_display_closed (GdkDisplay *display,
gboolean was_error,
GtkTooltips *tooltips)
{
gtk_tooltips_unset_tip_window (tooltips);
}
static void
disconnect_tip_window_display_closed (GtkTooltips *tooltips)
{
g_signal_handlers_disconnect_by_func (gtk_widget_get_display (tooltips->tip_window),
(gpointer) tip_window_display_closed,
tooltips);
}
static void
gtk_tooltips_unset_tip_window (GtkTooltips *tooltips)
{
if (tooltips->tip_window)
{
disconnect_tip_window_display_closed (tooltips);
gtk_widget_destroy (tooltips->tip_window);
tooltips->tip_window = NULL;
}
}
static void
gtk_tooltips_destroy (GtkObject *object)
{
GtkTooltips *tooltips = GTK_TOOLTIPS (object);
GList *current;
GtkTooltipsData *tooltipsdata;
g_return_if_fail (tooltips != NULL);
if (tooltips->timer_tag)
{
g_source_remove (tooltips->timer_tag);
tooltips->timer_tag = 0;
}
if (tooltips->tips_data_list != NULL)
{
current = g_list_first (tooltips->tips_data_list);
while (current != NULL)
{
tooltipsdata = (GtkTooltipsData*) current->data;
current = current->next;
gtk_tooltips_widget_remove (tooltipsdata->widget, tooltipsdata);
}
}
gtk_tooltips_unset_tip_window (tooltips);
GTK_OBJECT_CLASS (gtk_tooltips_parent_class)->destroy (object);
}
static void
gtk_tooltips_update_screen (GtkTooltips *tooltips,
gboolean new_window)
{
gboolean screen_changed = FALSE;
if (tooltips->active_tips_data &&
tooltips->active_tips_data->widget)
{
GdkScreen *screen = gtk_widget_get_screen (tooltips->active_tips_data->widget);
screen_changed = (screen != gtk_widget_get_screen (tooltips->tip_window));
if (screen_changed)
{
if (!new_window)
disconnect_tip_window_display_closed (tooltips);
gtk_window_set_screen (GTK_WINDOW (tooltips->tip_window), screen);
}
}
if (screen_changed || new_window)
g_signal_connect (gtk_widget_get_display (tooltips->tip_window), "closed",
G_CALLBACK (tip_window_display_closed), tooltips);
}
void
gtk_tooltips_force_window (GtkTooltips *tooltips)
{
g_return_if_fail (GTK_IS_TOOLTIPS (tooltips));
if (!tooltips->tip_window)
{
tooltips->tip_window = gtk_window_new (GTK_WINDOW_POPUP);
gtk_window_set_type_hint (GTK_WINDOW (tooltips->tip_window), GDK_WINDOW_TYPE_HINT_TOOLTIP);
gtk_tooltips_update_screen (tooltips, TRUE);
gtk_widget_set_app_paintable (tooltips->tip_window, TRUE);
gtk_window_set_resizable (GTK_WINDOW (tooltips->tip_window), FALSE);
gtk_widget_set_name (tooltips->tip_window, "gtk-tooltips");
gtk_container_set_border_width (GTK_CONTAINER (tooltips->tip_window), 4);
g_signal_connect_swapped (tooltips->tip_window,
"expose_event",
G_CALLBACK (gtk_tooltips_paint_window),
tooltips);
tooltips->tip_label = gtk_label_new (NULL);
gtk_label_set_line_wrap (GTK_LABEL (tooltips->tip_label), TRUE);
gtk_misc_set_alignment (GTK_MISC (tooltips->tip_label), 0.5, 0.5);
gtk_widget_show (tooltips->tip_label);
gtk_container_add (GTK_CONTAINER (tooltips->tip_window), tooltips->tip_label);
g_signal_connect (tooltips->tip_window,
"destroy",
G_CALLBACK (gtk_widget_destroyed),
&tooltips->tip_window);
}
}
void
gtk_tooltips_enable (GtkTooltips *tooltips)
{
g_return_if_fail (tooltips != NULL);
tooltips->enabled = TRUE;
}
void
gtk_tooltips_disable (GtkTooltips *tooltips)
{
g_return_if_fail (tooltips != NULL);
gtk_tooltips_set_active_widget (tooltips, NULL);
tooltips->enabled = FALSE;
}
void
gtk_tooltips_set_delay (GtkTooltips *tooltips,
guint delay)
{
g_return_if_fail (tooltips != NULL);
tooltips->delay = delay;
}
GtkTooltipsData*
gtk_tooltips_data_get (GtkWidget *widget)
{
g_return_val_if_fail (widget != NULL, NULL);
return g_object_get_data (G_OBJECT (widget), tooltips_data_key);
}
void
gtk_tooltips_set_tip (GtkTooltips *tooltips,
GtkWidget *widget,
const gchar *tip_text,
const gchar *tip_private)
{
GtkTooltipsData *tooltipsdata;
g_return_if_fail (GTK_IS_TOOLTIPS (tooltips));
g_return_if_fail (widget != NULL);
tooltipsdata = gtk_tooltips_data_get (widget);
if (!tip_text)
{
if (tooltipsdata)
gtk_tooltips_widget_remove (tooltipsdata->widget, tooltipsdata);
return;
}
if (tooltips->active_tips_data
&& tooltips->active_tips_data->widget == widget
&& GTK_WIDGET_DRAWABLE (tooltips->active_tips_data->widget))
{
g_free (tooltipsdata->tip_text);
g_free (tooltipsdata->tip_private);
tooltipsdata->tip_text = g_strdup (tip_text);
tooltipsdata->tip_private = g_strdup (tip_private);
gtk_tooltips_draw_tips (tooltips);
}
else
{
g_object_ref (widget);
if (tooltipsdata)
gtk_tooltips_widget_remove (tooltipsdata->widget, tooltipsdata);
tooltipsdata = g_new0 (GtkTooltipsData, 1);
tooltipsdata->tooltips = tooltips;
tooltipsdata->widget = widget;
tooltipsdata->tip_text = g_strdup (tip_text);
tooltipsdata->tip_private = g_strdup (tip_private);
tooltips->tips_data_list = g_list_append (tooltips->tips_data_list,
tooltipsdata);
g_signal_connect_after (widget, "event_after",
G_CALLBACK (gtk_tooltips_event_handler),
tooltipsdata);
g_object_set_data (G_OBJECT (widget), I_(tooltips_data_key),
tooltipsdata);
g_signal_connect (widget, "unmap",
G_CALLBACK (gtk_tooltips_widget_unmap),
tooltipsdata);
g_signal_connect (widget, "unrealize",
G_CALLBACK (gtk_tooltips_widget_unmap),
tooltipsdata);
g_signal_connect (widget, "destroy",
G_CALLBACK (gtk_tooltips_widget_remove),
tooltipsdata);
}
}
static gint
gtk_tooltips_paint_window (GtkTooltips *tooltips)
{
GtkRequisition req;
gtk_widget_size_request (tooltips->tip_window, &req);
gtk_paint_flat_box (tooltips->tip_window->style, tooltips->tip_window->window,
GTK_STATE_NORMAL, GTK_SHADOW_OUT,
NULL, GTK_WIDGET(tooltips->tip_window), "tooltip",
0, 0, req.width, req.height);
return FALSE;
}
static void
gtk_tooltips_draw_tips (GtkTooltips *tooltips)
{
GtkRequisition requisition;
GtkWidget *widget;
gint x, y, w, h;
GtkTooltipsData *data;
gboolean keyboard_mode;
GdkScreen *screen;
GdkScreen *pointer_screen;
gint monitor_num, px, py;
GdkRectangle monitor;
GtkWindow *toplevel;
if (!tooltips->tip_window)
gtk_tooltips_force_window (tooltips);
else if (GTK_WIDGET_VISIBLE (tooltips->tip_window))
g_get_current_time (&tooltips->last_popdown);
gtk_widget_ensure_style (tooltips->tip_window);
widget = tooltips->active_tips_data->widget;
g_object_set_data (G_OBJECT (tooltips->tip_window), I_(tooltips_info_key),
tooltips);
keyboard_mode = get_keyboard_mode (widget);
gtk_tooltips_update_screen (tooltips, FALSE);
screen = gtk_widget_get_screen (widget);
data = tooltips->active_tips_data;
gtk_label_set_text (GTK_LABEL (tooltips->tip_label), data->tip_text);
gtk_widget_size_request (tooltips->tip_window, &requisition);
w = requisition.width;
h = requisition.height;
gdk_window_get_origin (widget->window, &x, &y);
if (GTK_WIDGET_NO_WINDOW (widget))
{
x += widget->allocation.x;
y += widget->allocation.y;
}
x += widget->allocation.width / 2;
if (!keyboard_mode)
gdk_window_get_pointer (gdk_screen_get_root_window (screen),
&x, NULL, NULL);
x -= (w / 2 + 4);
gdk_display_get_pointer (gdk_screen_get_display (screen),
&pointer_screen, &px, &py, NULL);
if (pointer_screen != screen)
{
px = x;
py = y;
}
monitor_num = gdk_screen_get_monitor_at_point (screen, px, py);
gdk_screen_get_monitor_geometry (screen, monitor_num, &monitor);
if ((x + w) > monitor.x + monitor.width)
x -= (x + w) - (monitor.x + monitor.width);
else if (x < monitor.x)
x = monitor.x;
if ((y + h + widget->allocation.height + 4) > monitor.y + monitor.height)
y = y - h - 4;
else
y = y + widget->allocation.height + 4;
toplevel = GTK_WINDOW (gtk_widget_get_toplevel (widget));
if (toplevel && GTK_IS_WINDOW (toplevel))
gtk_window_set_transient_for (GTK_WINDOW (tooltips->tip_window), toplevel);
gtk_window_move (GTK_WINDOW (tooltips->tip_window), x, y);
gtk_widget_show (tooltips->tip_window);
}
static gboolean
gtk_tooltips_timeout (gpointer data)
{
GtkTooltips *tooltips = (GtkTooltips *) data;
if (tooltips->active_tips_data != NULL &&
GTK_WIDGET_DRAWABLE (tooltips->active_tips_data->widget))
gtk_tooltips_draw_tips (tooltips);
tooltips->timer_tag = 0;
return FALSE;
}
static void
gtk_tooltips_set_active_widget (GtkTooltips *tooltips,
GtkWidget *widget)
{
if (tooltips->tip_window)
{
if (GTK_WIDGET_VISIBLE (tooltips->tip_window))
g_get_current_time (&tooltips->last_popdown);
gtk_widget_hide (tooltips->tip_window);
}
if (tooltips->timer_tag)
{
g_source_remove (tooltips->timer_tag);
tooltips->timer_tag = 0;
}
tooltips->active_tips_data = NULL;
if (widget)
{
GList *list;
for (list = tooltips->tips_data_list; list; list = list->next)
{
GtkTooltipsData *tooltipsdata;
tooltipsdata = list->data;
if (tooltipsdata->widget == widget &&
GTK_WIDGET_DRAWABLE (widget))
{
tooltips->active_tips_data = tooltipsdata;
break;
}
}
}
else
{
tooltips->use_sticky_delay = FALSE;
}
}
static void
gtk_tooltips_show_tip (GtkWidget *widget)
{
GtkTooltipsData *tooltipsdata;
tooltipsdata = gtk_tooltips_data_get (widget);
if (tooltipsdata &&
(!tooltipsdata->tooltips->active_tips_data ||
tooltipsdata->tooltips->active_tips_data->widget != widget))
{
gtk_tooltips_set_active_widget (tooltipsdata->tooltips, widget);
gtk_tooltips_draw_tips (tooltipsdata->tooltips);
}
}
static void
gtk_tooltips_hide_tip (GtkWidget *widget)
{
GtkTooltipsData *tooltipsdata;
tooltipsdata = gtk_tooltips_data_get (widget);
if (tooltipsdata &&
(tooltipsdata->tooltips->active_tips_data &&
tooltipsdata->tooltips->active_tips_data->widget == widget))
gtk_tooltips_set_active_widget (tooltipsdata->tooltips, NULL);
}
static gboolean
gtk_tooltips_recently_shown (GtkTooltips *tooltips)
{
GTimeVal now;
glong msec;
g_get_current_time (&now);
msec = (now.tv_sec - tooltips->last_popdown.tv_sec) * 1000 +
(now.tv_usec - tooltips->last_popdown.tv_usec) / 1000;
return (msec < STICKY_REVERT_DELAY);
}
static gboolean
get_keyboard_mode (GtkWidget *widget)
{
GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
if (GTK_IS_WINDOW (toplevel))
return GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (toplevel), "gtk-tooltips-keyboard-mode"));
else
return FALSE;
}
static void
start_keyboard_mode (GtkWidget *widget)
{
GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
if (GTK_IS_WINDOW (toplevel))
{
GtkWidget *focus = GTK_WINDOW (toplevel)->focus_widget;
g_object_set_data (G_OBJECT (toplevel), I_("gtk-tooltips-keyboard-mode"), GUINT_TO_POINTER (TRUE));
if (focus)
gtk_tooltips_show_tip (focus);
}
}
static void
stop_keyboard_mode (GtkWidget *widget)
{
GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
if (GTK_IS_WINDOW (toplevel))
{
GtkWidget *focus = GTK_WINDOW (toplevel)->focus_widget;
if (focus)
gtk_tooltips_hide_tip (focus);
g_object_set_data (G_OBJECT (toplevel), I_("gtk-tooltips-keyboard-mode"), GUINT_TO_POINTER (FALSE));
}
}
static gboolean
tooltips_enabled (GtkTooltips *tooltips, GtkWidget *w)
{
GtkSettings *settings;
gboolean touchscreen;
if (!tooltips->enabled)
return FALSE;
settings = gtk_widget_get_settings (w);
g_object_get (settings, "gtk-touchscreen-mode", &touchscreen, NULL);
return !touchscreen;
}
static void
gtk_tooltips_start_delay (GtkTooltips *tooltips,
GtkWidget *widget)
{
GtkTooltipsData *old_tips_data;
old_tips_data = tooltips->active_tips_data;
if (tooltips_enabled (tooltips, widget) &&
(!old_tips_data || old_tips_data->widget != widget))
{
guint delay;
gtk_tooltips_set_active_widget (tooltips, widget);
if (tooltips->use_sticky_delay &&
gtk_tooltips_recently_shown (tooltips))
delay = STICKY_DELAY;
else
delay = tooltips->delay;
tooltips->timer_tag = gdk_threads_add_timeout (delay,
gtk_tooltips_timeout,
(gpointer) tooltips);
}
}
static void
gtk_tooltips_event_handler (GtkWidget *widget,
GdkEvent *event)
{
GtkTooltips *tooltips;
GtkTooltipsData *old_tips_data;
GtkWidget *event_widget;
gboolean keyboard_mode = get_keyboard_mode (widget);
if ((event->type == GDK_LEAVE_NOTIFY || event->type == GDK_ENTER_NOTIFY) &&
event->crossing.detail == GDK_NOTIFY_INFERIOR)
return;
old_tips_data = gtk_tooltips_data_get (widget);
tooltips = old_tips_data->tooltips;
if (keyboard_mode)
{
switch (event->type)
{
case GDK_FOCUS_CHANGE:
if (event->focus_change.in)
gtk_tooltips_show_tip (widget);
else
gtk_tooltips_hide_tip (widget);
break;
default:
break;
}
}
else
{
if (event->type != GDK_KEY_PRESS && event->type != GDK_KEY_RELEASE)
{
event_widget = gtk_get_event_widget (event);
if (event_widget != widget)
return;
}
switch (event->type)
{
case GDK_EXPOSE:
/* do nothing */
break;
case GDK_ENTER_NOTIFY:
if (!(GTK_IS_MENU_ITEM (widget) && GTK_MENU_ITEM (widget)->submenu))
gtk_tooltips_start_delay (tooltips, widget);
break;
case GDK_LEAVE_NOTIFY:
{
gboolean use_sticky_delay;
use_sticky_delay = tooltips->tip_window &&
GTK_WIDGET_VISIBLE (tooltips->tip_window);
gtk_tooltips_set_active_widget (tooltips, NULL);
tooltips->use_sticky_delay = use_sticky_delay;
}
break;
case GDK_MOTION_NOTIFY:
/* Handle menu items specially ... pend popup for each motion
* on other widgets, we ignore motion.
*/
if (GTK_IS_MENU_ITEM (widget) && !GTK_MENU_ITEM (widget)->submenu)
{
/* Completely evil hack to make sure we get the LEAVE_NOTIFY
*/
GTK_PRIVATE_SET_FLAG (widget, GTK_LEAVE_PENDING);
gtk_tooltips_set_active_widget (tooltips, NULL);
gtk_tooltips_start_delay (tooltips, widget);
break;
}
break; /* ignore */
case GDK_BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
case GDK_PROXIMITY_IN:
case GDK_SCROLL:
gtk_tooltips_set_active_widget (tooltips, NULL);
break;
default:
break;
}
}
}
static void
gtk_tooltips_widget_unmap (GtkWidget *widget,
gpointer data)
{
GtkTooltipsData *tooltipsdata = (GtkTooltipsData *)data;
GtkTooltips *tooltips = tooltipsdata->tooltips;
if (tooltips->active_tips_data &&
(tooltips->active_tips_data->widget == widget))
gtk_tooltips_set_active_widget (tooltips, NULL);
}
static void
gtk_tooltips_widget_remove (GtkWidget *widget,
gpointer data)
{
GtkTooltipsData *tooltipsdata = (GtkTooltipsData*) data;
GtkTooltips *tooltips = tooltipsdata->tooltips;
gtk_tooltips_widget_unmap (widget, data);
tooltips->tips_data_list = g_list_remove (tooltips->tips_data_list,
tooltipsdata);
gtk_tooltips_destroy_data (tooltipsdata);
}
void
_gtk_tooltips_toggle_keyboard_mode (GtkWidget *widget)
{
if (get_keyboard_mode (widget))
stop_keyboard_mode (widget);
else
start_keyboard_mode (widget);
}
/**
* gtk_tooltips_get_info_from_tip_window:
* @tip_window: a #GtkWindow
* @tooltips: the return location for the tooltips which are displayed
* in @tip_window, or %NULL
* @current_widget: the return location for the widget whose tooltips
* are displayed, or %NULL
*
* Determines the tooltips and the widget they belong to from the window in
* which they are displayed.
*
* This function is mostly intended for use by accessibility technologies;
* applications should have little use for it.
*
* Return value: %TRUE if @tip_window is displaying tooltips, otherwise %FALSE.
*
* Since: 2.4
**/
gboolean
gtk_tooltips_get_info_from_tip_window (GtkWindow *tip_window,
GtkTooltips **tooltips,
GtkWidget **current_widget)
{
GtkTooltips *current_tooltips;
gboolean has_tips;
g_return_val_if_fail (GTK_IS_WINDOW (tip_window), FALSE);
current_tooltips = g_object_get_data (G_OBJECT (tip_window), tooltips_info_key);
has_tips = current_tooltips != NULL;
if (tooltips)
*tooltips = current_tooltips;
if (current_widget)
*current_widget = (has_tips && current_tooltips->active_tips_data) ? current_tooltips->active_tips_data->widget : NULL;
return has_tips;
}
#define __GTK_TOOLTIPS_C__
#include "gtkaliasdef.c"