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gtk2/gtk/gtktooltips.c
Elliot Lee 060978e069 I submitted this patch twice to gtk-devel-list, and received no comments, 
I submitted this patch twice to gtk-devel-list, and received no comments, so
am committing it.  Although not exhaustively tested, I have been using this
gtk+ for a week w/o problems, and I did read the code to ensure that nothing
ever writes to these data structures. If by chance people encounter SEGV's in
gtk+ code that is setting values in global data structures, this patch could
be a possible culprit.

1998-11-30  Elliot Lee  <sopwith@cuc.ml.org>

	* {gdk,gtk}/*.c: Make read-only data structures "static const" to
	allow them to be shared, mainly including (but not limited to) the
	GtkTypeInfo structures for each class.

	* gtk/gtkfilesel.c: Add /net to the "leave me alone" directory listing.
1998-11-30 19:07:15 +00:00

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/* 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.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "gtkmain.h"
#include "gtkwidget.h"
#include "gtkdrawwindow.h"
#include "gtksignal.h"
#include "gtkstyle.h"
#include "gtktooltips.h"
#define DEFAULT_DELAY 500 /* Default delay in ms */
static void gtk_tooltips_class_init (GtkTooltipsClass *klass);
static void gtk_tooltips_init (GtkTooltips *tooltips);
static void gtk_tooltips_destroy (GtkObject *object);
static gint 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_expose (GtkTooltips *tooltips,
GdkEventExpose *event);
static void gtk_tooltips_draw_tips (GtkTooltips *tooltips);
static GtkDataClass *parent_class;
static const gchar *tooltips_data_key = "_GtkTooltipsData";
GtkType
gtk_tooltips_get_type (void)
{
static GtkType tooltips_type = 0;
if (!tooltips_type)
{
static const GtkTypeInfo tooltips_info =
{
"GtkTooltips",
sizeof (GtkTooltips),
sizeof (GtkTooltipsClass),
(GtkClassInitFunc) gtk_tooltips_class_init,
(GtkObjectInitFunc) gtk_tooltips_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
tooltips_type = gtk_type_unique (GTK_TYPE_DATA, &tooltips_info);
}
return tooltips_type;
}
static void
gtk_tooltips_class_init (GtkTooltipsClass *class)
{
GtkObjectClass *object_class;
object_class = (GtkObjectClass*) class;
parent_class = gtk_type_class (GTK_TYPE_DATA);
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->gc = NULL;
tooltips->foreground = NULL;
tooltips->background = NULL;
tooltips->delay = DEFAULT_DELAY;
tooltips->enabled = TRUE;
tooltips->timer_tag = 0;
}
GtkTooltips *
gtk_tooltips_new (void)
{
return gtk_type_new (GTK_TYPE_TOOLTIPS);
}
static void
gtk_tooltips_free_string (gpointer data, gpointer user_data)
{
if (data)
g_free (data);
}
static void
gtk_tooltips_destroy_data (GtkTooltipsData *tooltipsdata)
{
g_free (tooltipsdata->tip_text);
g_free (tooltipsdata->tip_private);
g_list_foreach (tooltipsdata->row, gtk_tooltips_free_string, 0);
if (tooltipsdata->row)
g_list_free (tooltipsdata->row);
gtk_signal_disconnect_by_data (GTK_OBJECT (tooltipsdata->widget),
(gpointer) tooltipsdata);
gtk_object_remove_data (GTK_OBJECT (tooltipsdata->widget), tooltips_data_key);
gtk_widget_unref (tooltipsdata->widget);
g_free (tooltipsdata);
}
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)
{
gtk_timeout_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);
}
}
if (tooltips->tip_window)
gtk_widget_destroy (tooltips->tip_window);
if (tooltips->gc != NULL)
{
gdk_gc_destroy (tooltips->gc);
tooltips->gc = NULL;
}
}
void
gtk_tooltips_force_window (GtkTooltips *tooltips)
{
g_return_if_fail (tooltips != NULL);
g_return_if_fail (GTK_IS_TOOLTIPS (tooltips));
if (!tooltips->tip_window)
{
tooltips->tip_window = gtk_draw_window_new (GTK_WINDOW_POPUP);
gtk_window_set_policy (GTK_WINDOW (tooltips->tip_window), FALSE, FALSE, TRUE);
gtk_signal_connect_object (GTK_OBJECT (tooltips->tip_window),
"expose_event",
GTK_SIGNAL_FUNC (gtk_tooltips_expose),
GTK_OBJECT (tooltips));
gtk_signal_connect (GTK_OBJECT (tooltips->tip_window),
"destroy",
gtk_widget_destroyed,
&tooltips->tip_window);
}
}
static void
gtk_tooltips_layout_text (GtkTooltips *tooltips, GtkTooltipsData *data)
{
gchar *row_end, *text, *row_text, *break_pos;
gint i, row_width, window_width = 0;
size_t len;
if (!tooltips->tip_window)
gtk_tooltips_force_window (tooltips);
g_list_foreach (data->row, gtk_tooltips_free_string, 0);
if (data->row)
g_list_free (data->row);
data->row = 0;
data->font = tooltips->tip_window->style->font;
data->width = 0;
text = data->tip_text;
if (!text)
return;
while (*text)
{
row_end = strchr (text, '\n');
if (!row_end)
row_end = strchr (text, '\0');
len = row_end - text + 1;
row_text = g_new(gchar, len);
memcpy (row_text, text, len - 1);
row_text[len - 1] = '\0';
/* now either adjust the window's width or shorten the row until
it fits in the window */
while (1)
{
row_width = gdk_string_width (data->font, row_text);
if (!window_width)
{
/* make an initial guess at window's width: */
if (row_width > gdk_screen_width () / 4)
window_width = gdk_screen_width () / 4;
else
window_width = row_width;
}
if (row_width <= window_width)
break;
if (strchr (row_text, ' '))
{
/* the row is currently too wide, but we have blanks in
the row so we can break it into smaller pieces */
gint avg_width = row_width / strlen (row_text);
i = window_width;
if (avg_width)
i /= avg_width;
if ((size_t) i >= len)
i = len - 1;
break_pos = strchr (row_text + i, ' ');
if (!break_pos)
{
break_pos = row_text + i;
while (*--break_pos != ' ');
}
*break_pos = '\0';
}
else
{
/* we can't break this row into any smaller pieces, so
we have no choice but to widen the window: */
window_width = row_width;
break;
}
}
if (row_width > data->width)
data->width = row_width;
data->row = g_list_append (data->row, row_text);
text += strlen (row_text);
if (!*text)
break;
if (text[0] == '\n' && text[1])
/* end of paragraph and there is more text to come */
data->row = g_list_append (data->row, 0);
++text; /* skip blank or newline */
}
data->width += 8; /* leave some border */
}
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 gtk_object_get_data ((GtkObject*) 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 (tooltips != NULL);
g_return_if_fail (GTK_IS_TOOLTIPS (tooltips));
g_return_if_fail (widget != NULL);
tooltipsdata = gtk_tooltips_data_get (widget);
if (tooltipsdata)
gtk_tooltips_widget_remove (tooltipsdata->widget, tooltipsdata);
if (!tip_text)
return;
tooltipsdata = g_new0 (GtkTooltipsData, 1);
if (tooltipsdata != NULL)
{
tooltipsdata->tooltips = tooltips;
tooltipsdata->widget = widget;
gtk_widget_ref (widget);
tooltipsdata->tip_text = g_strdup (tip_text);
tooltipsdata->tip_private = g_strdup (tip_private);
gtk_tooltips_layout_text (tooltips, tooltipsdata);
tooltips->tips_data_list = g_list_append (tooltips->tips_data_list,
tooltipsdata);
gtk_signal_connect_after(GTK_OBJECT (widget), "event",
(GtkSignalFunc) gtk_tooltips_event_handler,
(gpointer) tooltipsdata);
gtk_object_set_data (GTK_OBJECT (widget), tooltips_data_key,
(gpointer) tooltipsdata);
gtk_signal_connect (GTK_OBJECT (widget), "unmap",
(GtkSignalFunc) gtk_tooltips_widget_unmap,
(gpointer) tooltipsdata);
gtk_signal_connect (GTK_OBJECT (widget), "unrealize",
(GtkSignalFunc) gtk_tooltips_widget_unmap,
(gpointer) tooltipsdata);
gtk_signal_connect (GTK_OBJECT (widget), "destroy",
(GtkSignalFunc) gtk_tooltips_widget_remove,
(gpointer) tooltipsdata);
}
}
void
gtk_tooltips_set_colors (GtkTooltips *tooltips,
GdkColor *background,
GdkColor *foreground)
{
g_return_if_fail (tooltips != NULL);
if (background != NULL)
tooltips->foreground = foreground;
if (foreground != NULL)
tooltips->background = background;
}
static gint
gtk_tooltips_expose (GtkTooltips *tooltips, GdkEventExpose *event)
{
GtkStyle *style;
gint y, baseline_skip, gap;
GtkTooltipsData *data;
GList *el;
style = tooltips->tip_window->style;
gap = (style->font->ascent + style->font->descent) / 4;
if (gap < 2)
gap = 2;
baseline_skip = style->font->ascent + style->font->descent + gap;
data = tooltips->active_tips_data;
if (!data)
return FALSE;
gtk_paint_flat_box(style, tooltips->tip_window->window,
GTK_STATE_NORMAL, GTK_SHADOW_OUT,
NULL, GTK_WIDGET(tooltips->tip_window), "tooltip",
0, 0, -1, -1);
y = style->font->ascent + 4;
for (el = data->row; el; el = el->next)
{
if (el->data)
{
gtk_paint_string (style, tooltips->tip_window->window,
GTK_STATE_NORMAL,
NULL, GTK_WIDGET(tooltips->tip_window), "tooltip",
4, y, el->data);
y += baseline_skip;
}
else
y += baseline_skip / 2;
}
return FALSE;
}
static void
gtk_tooltips_draw_tips (GtkTooltips * tooltips)
{
GtkWidget *widget;
GtkStyle *style;
gint gap, x, y, w, h, scr_w, scr_h, baseline_skip;
GtkTooltipsData *data;
GList *el;
if (!tooltips->tip_window)
gtk_tooltips_force_window (tooltips);
else if (GTK_WIDGET_VISIBLE (tooltips->tip_window))
gtk_widget_hide (tooltips->tip_window);
style = tooltips->tip_window->style;
widget = tooltips->active_tips_data->widget;
scr_w = gdk_screen_width ();
scr_h = gdk_screen_height ();
data = tooltips->active_tips_data;
if (data->font != style->font)
gtk_tooltips_layout_text (tooltips, data);
gap = (style->font->ascent + style->font->descent) / 4;
if (gap < 2)
gap = 2;
baseline_skip = style->font->ascent + style->font->descent + gap;
w = data->width;
h = 8 - gap;
for (el = data->row; el; el = el->next)
if (el->data)
h += baseline_skip;
else
h += baseline_skip / 2;
if (h < 8)
h = 8;
gdk_window_get_pointer (NULL, &x, NULL, NULL);
gdk_window_get_origin (widget->window, NULL, &y);
x -= ((w >> 1) + 4);
if ((x + w) > scr_w)
x -= (x + w) - scr_w;
else if (x < 0)
x = 0;
if ((y + h + widget->allocation.height + 4) > scr_h)
y = y - h - 4;
else
y = y + widget->allocation.height + 4;
gtk_widget_set_usize (tooltips->tip_window, w, h);
gtk_widget_popup (tooltips->tip_window, x, y);
}
static gint
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);
return FALSE;
}
static void
gtk_tooltips_set_active_widget (GtkTooltips *tooltips,
GtkWidget *widget)
{
if (tooltips->tip_window)
gtk_widget_hide (tooltips->tip_window);
if (tooltips->timer_tag)
{
gtk_timeout_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;
}
}
}
}
static gint
gtk_tooltips_event_handler (GtkWidget *widget,
GdkEvent *event)
{
GtkTooltips *tooltips;
GtkTooltipsData *old_tips_data;
GtkWidget *event_widget;
if ((event->type == GDK_LEAVE_NOTIFY || event->type == GDK_ENTER_NOTIFY) &&
event->crossing.detail == GDK_NOTIFY_INFERIOR)
return FALSE;
event_widget = gtk_get_event_widget (event);
if (event_widget != widget)
return FALSE;
old_tips_data = gtk_tooltips_data_get (widget);
tooltips = old_tips_data->tooltips;
switch (event->type)
{
case GDK_MOTION_NOTIFY:
case GDK_EXPOSE:
/* do nothing */
break;
case GDK_ENTER_NOTIFY:
old_tips_data = tooltips->active_tips_data;
if (tooltips->enabled &&
(!old_tips_data || old_tips_data->widget != widget))
{
gtk_tooltips_set_active_widget (tooltips, widget);
tooltips->timer_tag = gtk_timeout_add (tooltips->delay,
gtk_tooltips_timeout,
(gpointer) tooltips);
}
break;
default:
gtk_tooltips_set_active_widget (tooltips, NULL);
break;
}
return FALSE;
}
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);
}
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