gimp/libgimpwidgets/gimpchainbutton.c

322 lines
9.2 KiB
C

/* 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 "gimpwidgetstypes.h"
#include "gimpchainbutton.h"
#include "gimpstock.h"
enum
{
TOGGLED,
LAST_SIGNAL
};
static void gimp_chain_button_class_init (GimpChainButtonClass *klass);
static void gimp_chain_button_init (GimpChainButton *gcb);
static void gimp_chain_button_clicked_callback (GtkWidget *widget,
GimpChainButton *gcb);
static gint gimp_chain_button_draw_lines (GtkWidget *widget,
GdkEventExpose *eevent,
GimpChainButton *gcb);
static const gchar *gimp_chain_stock_items[] =
{
GIMP_STOCK_HCHAIN,
GIMP_STOCK_HCHAIN_BROKEN,
GIMP_STOCK_VCHAIN,
GIMP_STOCK_VCHAIN_BROKEN
};
static guint gimp_chain_button_signals[LAST_SIGNAL] = { 0 };
static GtkTableClass *parent_class = NULL;
GType
gimp_chain_button_get_type (void)
{
static GType gcb_type = 0;
if (! gcb_type)
{
static const GTypeInfo gcb_info =
{
sizeof (GimpChainButtonClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_chain_button_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpChainButton),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_chain_button_init,
};
gcb_type = g_type_register_static (GTK_TYPE_TABLE,
"GimpChainButton",
&gcb_info, 0);
}
return gcb_type;
}
static void
gimp_chain_button_class_init (GimpChainButtonClass *klass)
{
parent_class = g_type_class_peek_parent (klass);
gimp_chain_button_signals[TOGGLED] =
g_signal_new ("toggled",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpChainButtonClass, toggled),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
klass->toggled = NULL;
}
static void
gimp_chain_button_init (GimpChainButton *gcb)
{
gcb->position = GIMP_CHAIN_TOP;
gcb->active = FALSE;
gcb->line1 = gtk_drawing_area_new ();
gcb->line2 = gtk_drawing_area_new ();
gcb->image = gtk_image_new ();
gcb->button = gtk_button_new ();
gtk_button_set_relief (GTK_BUTTON (gcb->button), GTK_RELIEF_NONE);
gtk_container_add (GTK_CONTAINER (gcb->button), gcb->image);
gtk_widget_show (gcb->image);
g_signal_connect (G_OBJECT (gcb->button), "clicked",
G_CALLBACK (gimp_chain_button_clicked_callback),
gcb);
g_signal_connect (G_OBJECT (gcb->line1), "expose_event",
G_CALLBACK (gimp_chain_button_draw_lines),
gcb);
g_signal_connect (G_OBJECT (gcb->line2), "expose_event",
G_CALLBACK (gimp_chain_button_draw_lines),
gcb);
}
/**
* 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 = g_object_new (GIMP_TYPE_CHAIN_BUTTON, NULL);
gcb->position = position;
gtk_image_set_from_stock
(GTK_IMAGE (gcb->image),
gimp_chain_stock_items[((position & GIMP_CHAIN_LEFT) << 1) + ! gcb->active],
GTK_ICON_SIZE_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->button);
gtk_widget_show (gcb->line1);
gtk_widget_show (gcb->line2);
return GTK_WIDGET (gcb);
}
/**
* gimp_chain_button_set_active:
* @gcb: Pointer to a #GimpChainButton.
* @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 active)
{
g_return_if_fail (GIMP_IS_CHAIN_BUTTON (gcb));
if (gcb->active != active)
{
gcb->active = active ? TRUE : FALSE;
gtk_image_set_from_stock
(GTK_IMAGE (gcb->image),
gimp_chain_stock_items[((gcb->position & GIMP_CHAIN_LEFT) << 1) + ! gcb->active],
GTK_ICON_SIZE_BUTTON);
}
}
/**
* 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_clicked_callback (GtkWidget *widget,
GimpChainButton *gcb)
{
g_return_if_fail (GIMP_IS_CHAIN_BUTTON (gcb));
gimp_chain_button_set_active (gcb, ! gcb->active);
g_signal_emit (G_OBJECT (gcb), gimp_chain_button_signals[TOGGLED], 0);
}
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;
}