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gimp/libgimp/gimpchainbutton.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimpchainbutton.c
* Copyright (C) 1999-2000 Sven Neumann <sven@gimp.org>
*
* 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
* Library 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.
*/
#include <gtk/gtk.h>
#include "gimpchainbutton.h"
#include "pixmaps/chain.xpm"
static gchar **gimp_chain_xpm[] =
{
chain_hor_xpm,
chain_ver_xpm
};
static gchar **gimp_chain_broken_xpm[] =
{
chain_broken_hor_xpm,
chain_broken_ver_xpm
};
static guint gimp_chain_width[] =
{
24,
9
};
static guint gimp_chain_height[] =
{
9,
24
};
static void gimp_chain_button_destroy (GtkObject *object);
static void gimp_chain_button_realize (GtkWidget *widget);
static void gimp_chain_button_clicked_callback (GtkWidget *widget,
GimpChainButton *gcb);
static gint gimp_chain_button_draw_lines (GtkWidget *widget,
GdkEventExpose *eevent,
GimpChainButton *gcb);
enum
{
TOGGLED,
LAST_SIGNAL
};
static guint gimp_chain_button_signals[LAST_SIGNAL] = { 0 };
static GtkTableClass *parent_class = NULL;
static void
gimp_chain_button_destroy (GtkObject *object)
{
GimpChainButton *gcb;
g_return_if_fail (gcb = GIMP_CHAIN_BUTTON (object));
if (gcb->broken)
gdk_pixmap_unref (gcb->broken);
if (gcb->broken_mask)
gdk_bitmap_unref (gcb->broken_mask);
if (gcb->chain)
gdk_pixmap_unref (gcb->chain);
if (gcb->chain_mask)
gdk_bitmap_unref (gcb->chain_mask);
if (GTK_OBJECT_CLASS (parent_class)->destroy)
(* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}
static void
gimp_chain_button_class_init (GimpChainButtonClass *class)
{
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
object_class = (GtkObjectClass*) class;
widget_class = (GtkWidgetClass *) class;
parent_class = gtk_type_class (gtk_table_get_type ());
object_class->destroy = gimp_chain_button_destroy;
gimp_chain_button_signals[TOGGLED] =
gtk_signal_new ("toggled",
GTK_RUN_FIRST,
object_class->type,
GTK_SIGNAL_OFFSET (GimpChainButtonClass,
toggled),
gtk_signal_default_marshaller, GTK_TYPE_NONE, 0);
gtk_object_class_add_signals (object_class, gimp_chain_button_signals,
LAST_SIGNAL);
class->toggled = NULL;
widget_class->realize = gimp_chain_button_realize;
}
static void
gimp_chain_button_init (GimpChainButton *gcb)
{
gcb->position = GIMP_CHAIN_TOP;
gcb->line1 = gtk_drawing_area_new ();
gcb->line2 = gtk_drawing_area_new ();
gcb->pixmap = NULL;
gcb->broken = NULL;
gcb->broken_mask = NULL;
gcb->chain = NULL;
gcb->chain_mask = NULL;
gcb->active = FALSE;
gcb->button = gtk_button_new ();
gtk_button_set_relief (GTK_BUTTON (gcb->button), GTK_RELIEF_NONE);
gcb->pixmap = gtk_type_new (gtk_pixmap_get_type ());
gtk_pixmap_set_build_insensitive (GTK_PIXMAP (gcb->pixmap), TRUE);
gtk_signal_connect (GTK_OBJECT(gcb->button), "clicked",
GTK_SIGNAL_FUNC (gimp_chain_button_clicked_callback), gcb);
gtk_signal_connect (GTK_OBJECT (gcb->line1), "expose_event",
GTK_SIGNAL_FUNC (gimp_chain_button_draw_lines),
gcb);
gtk_signal_connect (GTK_OBJECT (gcb->line2), "expose_event",
GTK_SIGNAL_FUNC (gimp_chain_button_draw_lines),
gcb);
}
GtkType
gimp_chain_button_get_type (void)
{
static guint gcb_type = 0;
if (!gcb_type)
{
GtkTypeInfo gcb_info =
{
"GimpChainButton",
sizeof (GimpChainButton),
sizeof (GimpChainButtonClass),
(GtkClassInitFunc) gimp_chain_button_class_init,
(GtkObjectInitFunc) gimp_chain_button_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL
};
gcb_type = gtk_type_unique (gtk_table_get_type (), &gcb_info);
}
return gcb_type;
}
/**
* gimp_chain_button_new:
* @position: The position you are going to use for the button
* with respect to the widgets you want to chain.
*
* Creates a new #GimpChainButton widget.
*
* This returns a button showing either a broken or a linked chain and
* small clamps attached to both sides that visually group the two widgets
* you want to connect. This widget looks best when attached
* to a table taking up two columns (or rows respectively) next
* to the widgets that it is supposed to connect. It may work
* for more than two widgets, but the look is optimized for two.
*
* Returns: Pointer to the new #GimpChainButton, which is inactive
* by default. Use gimp_chain_button_set_active() to
* change its state.
*/
GtkWidget *
gimp_chain_button_new (GimpChainPosition position)
{
GimpChainButton *gcb;
gcb = gtk_type_new (gimp_chain_button_get_type ());
gcb->position = position;
gcb->pixmap->requisition.width =
gimp_chain_width[position % 2] + GTK_MISC (gcb->pixmap)->xpad * 2;
gcb->pixmap->requisition.height =
gimp_chain_height[position % 2] + GTK_MISC (gcb->pixmap)->ypad * 2;
gtk_container_add (GTK_CONTAINER (gcb->button), gcb->pixmap);
gtk_widget_show (gcb->pixmap);
gtk_widget_show (gcb->button);
if (position & GIMP_CHAIN_LEFT) /* are we a vertical chainbutton? */
{
gtk_table_resize (GTK_TABLE (gcb), 3, 1);
gtk_table_attach (GTK_TABLE (gcb), gcb->button, 0, 1, 1, 2,
GTK_SHRINK, GTK_SHRINK, 0, 0);
gtk_table_attach_defaults (GTK_TABLE (gcb), gcb->line1, 0, 1, 0, 1);
gtk_table_attach_defaults (GTK_TABLE (gcb), gcb->line2, 0, 1, 2, 3);
}
else
{
gtk_table_resize (GTK_TABLE (gcb), 1, 3);
gtk_table_attach (GTK_TABLE (gcb), gcb->button, 1, 2, 0, 1,
GTK_SHRINK, GTK_SHRINK, 0, 0);
gtk_table_attach_defaults (GTK_TABLE (gcb), gcb->line1, 0, 1, 0, 1);
gtk_table_attach_defaults (GTK_TABLE (gcb), gcb->line2, 2, 3, 0, 1);
}
gtk_widget_show (gcb->line1);
gtk_widget_show (gcb->line2);
return GTK_WIDGET (gcb);
}
/**
* gimp_chain_button_set_active:
* @gcb: Pointer to a #GimpChainButton.
* @is_active: The new state.
*
* Sets the state of the #GimpChainButton to be either locked (TRUE) or
* unlocked (FALSE) and changes the showed pixmap to reflect the new state.
*/
void
gimp_chain_button_set_active (GimpChainButton *gcb,
gboolean is_active)
{
g_return_if_fail (GIMP_IS_CHAIN_BUTTON (gcb));
if (gcb->active != is_active)
{
gcb->active = is_active;
if (!GTK_WIDGET_REALIZED (GTK_WIDGET (gcb)))
return;
if (gcb->active)
gtk_pixmap_set (GTK_PIXMAP(gcb->pixmap), gcb->chain, gcb->chain_mask);
else
gtk_pixmap_set (GTK_PIXMAP(gcb->pixmap), gcb->broken, gcb->broken_mask);
}
}
/**
* gimp_chain_button_get_active
* @gcb: Pointer to a #GimpChainButton.
*
* Checks the state of the #GimpChainButton.
*
* Returns: TRUE if the #GimpChainButton is active (locked).
*/
gboolean
gimp_chain_button_get_active (GimpChainButton *gcb)
{
g_return_val_if_fail (GIMP_IS_CHAIN_BUTTON (gcb), FALSE);
return gcb->active;
}
static void
gimp_chain_button_realize (GtkWidget *widget)
{
GimpChainButton *gcb;
GtkStyle *style;
gcb = GIMP_CHAIN_BUTTON (widget);
if (GTK_WIDGET_CLASS (parent_class)->realize)
(* GTK_WIDGET_CLASS (parent_class)->realize) (widget);
style = gtk_widget_get_style (widget);
gcb->chain = gdk_pixmap_create_from_xpm_d (widget->window,
&gcb->chain_mask,
&style->bg[GTK_STATE_NORMAL],
gimp_chain_xpm[gcb->position % 2]);
gcb->broken = gdk_pixmap_create_from_xpm_d (widget->window,
&gcb->broken_mask,
&style->bg[GTK_STATE_NORMAL],
gimp_chain_broken_xpm[gcb->position % 2]);
if (gcb->active)
gtk_pixmap_set (GTK_PIXMAP (gcb->pixmap), gcb->chain, gcb->chain_mask);
else
gtk_pixmap_set (GTK_PIXMAP (gcb->pixmap), gcb->broken, gcb->broken_mask);
gtk_widget_realize (gcb->line1);
gtk_style_set_background (widget->style, gcb->line1->window, GTK_STATE_NORMAL);
gdk_window_set_back_pixmap (gcb->line1->window, NULL, TRUE);
gtk_widget_realize (gcb->line2);
gtk_style_set_background (widget->style, gcb->line2->window, GTK_STATE_NORMAL);
gdk_window_set_back_pixmap (gcb->line2->window, NULL, TRUE);
}
static void
gimp_chain_button_clicked_callback (GtkWidget *widget,
GimpChainButton *gcb)
{
g_return_if_fail (GIMP_IS_CHAIN_BUTTON (gcb));
gcb->active = !(gcb->active);
if (!GTK_WIDGET_REALIZED (GTK_WIDGET (gcb)))
return;
if (gcb->active)
gtk_pixmap_set (GTK_PIXMAP(gcb->pixmap), gcb->chain, gcb->chain_mask);
else
gtk_pixmap_set (GTK_PIXMAP(gcb->pixmap), gcb->broken, gcb->broken_mask);
gtk_signal_emit (GTK_OBJECT (gcb), gimp_chain_button_signals[TOGGLED]);
}
static gint
gimp_chain_button_draw_lines (GtkWidget *widget,
GdkEventExpose *eevent,
GimpChainButton *gcb)
{
GdkPoint points[3];
GdkPoint buf;
GtkShadowType shadow;
gint which_line;
#define SHORT_LINE 4
/* don't set this too high, there's no check against drawing outside
the widgets bounds yet (and probably never will be) */
g_return_val_if_fail (GIMP_IS_CHAIN_BUTTON (gcb), FALSE);
points[0].x = widget->allocation.width / 2;
points[0].y = widget->allocation.height / 2;
which_line = (widget == gcb->line1) ? 1 : -1;
switch (gcb->position)
{
case GIMP_CHAIN_LEFT:
points[0].x += SHORT_LINE;
points[1].x = points[0].x - SHORT_LINE;
points[1].y = points[0].y;
points[2].x = points[1].x;
points[2].y = (which_line == 1) ? widget->allocation.height - 1 : 0;
shadow = GTK_SHADOW_ETCHED_IN;
break;
case GIMP_CHAIN_RIGHT:
points[0].x -= SHORT_LINE;
points[1].x = points[0].x + SHORT_LINE;
points[1].y = points[0].y;
points[2].x = points[1].x;
points[2].y = (which_line == 1) ? widget->allocation.height - 1 : 0;
shadow = GTK_SHADOW_ETCHED_OUT;
break;
case GIMP_CHAIN_TOP:
points[0].y += SHORT_LINE;
points[1].x = points[0].x;
points[1].y = points[0].y - SHORT_LINE;
points[2].x = (which_line == 1) ? widget->allocation.width - 1 : 0;
points[2].y = points[1].y;
shadow = GTK_SHADOW_ETCHED_OUT;
break;
case GIMP_CHAIN_BOTTOM:
points[0].y -= SHORT_LINE;
points[1].x = points[0].x;
points[1].y = points[0].y + SHORT_LINE;
points[2].x = (which_line == 1) ? widget->allocation.width - 1 : 0;
points[2].y = points[1].y;
shadow = GTK_SHADOW_ETCHED_IN;
break;
default:
return FALSE;
}
if ( ((shadow == GTK_SHADOW_ETCHED_OUT) && (which_line == -1)) ||
((shadow == GTK_SHADOW_ETCHED_IN) && (which_line == 1)) )
{
buf = points[0];
points[0] = points[2];
points[2] = buf;
}
gtk_paint_polygon (widget->style,
widget->window,
GTK_STATE_NORMAL,
shadow,
&eevent->area,
widget,
"chainbutton",
points,
3,
FALSE);
return TRUE;
}
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