mirror of https://github.com/GNOME/gimp.git
322 lines
9.2 KiB
C
322 lines
9.2 KiB
C
/* LIBGIMP - The GIMP Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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*
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* gimpchainbutton.c
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* Copyright (C) 1999-2000 Sven Neumann <sven@gimp.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <gtk/gtk.h>
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#include "gimpwidgetstypes.h"
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#include "gimpchainbutton.h"
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#include "gimpstock.h"
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enum
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{
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TOGGLED,
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LAST_SIGNAL
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};
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static void gimp_chain_button_class_init (GimpChainButtonClass *klass);
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static void gimp_chain_button_init (GimpChainButton *gcb);
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static void gimp_chain_button_clicked_callback (GtkWidget *widget,
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GimpChainButton *gcb);
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static gint gimp_chain_button_draw_lines (GtkWidget *widget,
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GdkEventExpose *eevent,
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GimpChainButton *gcb);
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static const gchar *gimp_chain_stock_items[] =
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{
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GIMP_STOCK_HCHAIN,
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GIMP_STOCK_HCHAIN_BROKEN,
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GIMP_STOCK_VCHAIN,
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GIMP_STOCK_VCHAIN_BROKEN
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};
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static guint gimp_chain_button_signals[LAST_SIGNAL] = { 0 };
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static GtkTableClass *parent_class = NULL;
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GType
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gimp_chain_button_get_type (void)
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{
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static GType gcb_type = 0;
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if (! gcb_type)
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{
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static const GTypeInfo gcb_info =
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{
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sizeof (GimpChainButtonClass),
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(GBaseInitFunc) NULL,
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(GBaseFinalizeFunc) NULL,
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(GClassInitFunc) gimp_chain_button_class_init,
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NULL, /* class_finalize */
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NULL, /* class_data */
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sizeof (GimpChainButton),
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0, /* n_preallocs */
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(GInstanceInitFunc) gimp_chain_button_init,
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};
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gcb_type = g_type_register_static (GTK_TYPE_TABLE,
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"GimpChainButton",
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&gcb_info, 0);
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}
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return gcb_type;
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}
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static void
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gimp_chain_button_class_init (GimpChainButtonClass *klass)
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{
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parent_class = g_type_class_peek_parent (klass);
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gimp_chain_button_signals[TOGGLED] =
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g_signal_new ("toggled",
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (GimpChainButtonClass, toggled),
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NULL, NULL,
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g_cclosure_marshal_VOID__VOID,
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G_TYPE_NONE, 0);
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klass->toggled = NULL;
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}
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static void
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gimp_chain_button_init (GimpChainButton *gcb)
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{
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gcb->position = GIMP_CHAIN_TOP;
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gcb->active = FALSE;
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gcb->line1 = gtk_drawing_area_new ();
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gcb->line2 = gtk_drawing_area_new ();
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gcb->image = gtk_image_new ();
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gcb->button = gtk_button_new ();
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gtk_button_set_relief (GTK_BUTTON (gcb->button), GTK_RELIEF_NONE);
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gtk_container_add (GTK_CONTAINER (gcb->button), gcb->image);
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gtk_widget_show (gcb->image);
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g_signal_connect (G_OBJECT (gcb->button), "clicked",
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G_CALLBACK (gimp_chain_button_clicked_callback),
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gcb);
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g_signal_connect (G_OBJECT (gcb->line1), "expose_event",
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G_CALLBACK (gimp_chain_button_draw_lines),
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gcb);
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g_signal_connect (G_OBJECT (gcb->line2), "expose_event",
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G_CALLBACK (gimp_chain_button_draw_lines),
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gcb);
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}
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/**
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* gimp_chain_button_new:
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* @position: The position you are going to use for the button
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* with respect to the widgets you want to chain.
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*
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* Creates a new #GimpChainButton widget.
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*
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* This returns a button showing either a broken or a linked chain and
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* small clamps attached to both sides that visually group the two widgets
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* you want to connect. This widget looks best when attached
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* to a table taking up two columns (or rows respectively) next
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* to the widgets that it is supposed to connect. It may work
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* for more than two widgets, but the look is optimized for two.
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*
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* Returns: Pointer to the new #GimpChainButton, which is inactive
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* by default. Use gimp_chain_button_set_active() to
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* change its state.
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*/
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GtkWidget *
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gimp_chain_button_new (GimpChainPosition position)
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{
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GimpChainButton *gcb;
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gcb = g_object_new (GIMP_TYPE_CHAIN_BUTTON, NULL);
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gcb->position = position;
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gtk_image_set_from_stock
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(GTK_IMAGE (gcb->image),
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gimp_chain_stock_items[((position & GIMP_CHAIN_LEFT) << 1) + ! gcb->active],
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GTK_ICON_SIZE_BUTTON);
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if (position & GIMP_CHAIN_LEFT) /* are we a vertical chainbutton? */
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{
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gtk_table_resize (GTK_TABLE (gcb), 3, 1);
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gtk_table_attach (GTK_TABLE (gcb), gcb->button, 0, 1, 1, 2,
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GTK_SHRINK, GTK_SHRINK, 0, 0);
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gtk_table_attach_defaults (GTK_TABLE (gcb), gcb->line1, 0, 1, 0, 1);
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gtk_table_attach_defaults (GTK_TABLE (gcb), gcb->line2, 0, 1, 2, 3);
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}
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else
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{
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gtk_table_resize (GTK_TABLE (gcb), 1, 3);
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gtk_table_attach (GTK_TABLE (gcb), gcb->button, 1, 2, 0, 1,
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GTK_SHRINK, GTK_SHRINK, 0, 0);
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gtk_table_attach_defaults (GTK_TABLE (gcb), gcb->line1, 0, 1, 0, 1);
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gtk_table_attach_defaults (GTK_TABLE (gcb), gcb->line2, 2, 3, 0, 1);
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}
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gtk_widget_show (gcb->button);
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gtk_widget_show (gcb->line1);
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gtk_widget_show (gcb->line2);
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return GTK_WIDGET (gcb);
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}
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/**
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* gimp_chain_button_set_active:
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* @gcb: Pointer to a #GimpChainButton.
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* @active: The new state.
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*
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* Sets the state of the #GimpChainButton to be either locked (#TRUE) or
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* unlocked (#FALSE) and changes the showed pixmap to reflect the new state.
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*/
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void
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gimp_chain_button_set_active (GimpChainButton *gcb,
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gboolean active)
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{
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g_return_if_fail (GIMP_IS_CHAIN_BUTTON (gcb));
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if (gcb->active != active)
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{
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gcb->active = active ? TRUE : FALSE;
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gtk_image_set_from_stock
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(GTK_IMAGE (gcb->image),
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gimp_chain_stock_items[((gcb->position & GIMP_CHAIN_LEFT) << 1) + ! gcb->active],
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GTK_ICON_SIZE_BUTTON);
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}
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}
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/**
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* gimp_chain_button_get_active
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* @gcb: Pointer to a #GimpChainButton.
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*
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* Checks the state of the #GimpChainButton.
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*
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* Returns: TRUE if the #GimpChainButton is active (locked).
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*/
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gboolean
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gimp_chain_button_get_active (GimpChainButton *gcb)
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{
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g_return_val_if_fail (GIMP_IS_CHAIN_BUTTON (gcb), FALSE);
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return gcb->active;
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}
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static void
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gimp_chain_button_clicked_callback (GtkWidget *widget,
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GimpChainButton *gcb)
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{
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g_return_if_fail (GIMP_IS_CHAIN_BUTTON (gcb));
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gimp_chain_button_set_active (gcb, ! gcb->active);
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g_signal_emit (G_OBJECT (gcb), gimp_chain_button_signals[TOGGLED], 0);
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}
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static gint
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gimp_chain_button_draw_lines (GtkWidget *widget,
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GdkEventExpose *eevent,
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GimpChainButton *gcb)
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{
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GdkPoint points[3];
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GdkPoint buf;
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GtkShadowType shadow;
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gint which_line;
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#define SHORT_LINE 4
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/* don't set this too high, there's no check against drawing outside
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the widgets bounds yet (and probably never will be) */
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g_return_val_if_fail (GIMP_IS_CHAIN_BUTTON (gcb), FALSE);
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points[0].x = widget->allocation.width / 2;
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points[0].y = widget->allocation.height / 2;
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which_line = (widget == gcb->line1) ? 1 : -1;
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switch (gcb->position)
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{
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case GIMP_CHAIN_LEFT:
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points[0].x += SHORT_LINE;
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points[1].x = points[0].x - SHORT_LINE;
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points[1].y = points[0].y;
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points[2].x = points[1].x;
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points[2].y = (which_line == 1) ? widget->allocation.height - 1 : 0;
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shadow = GTK_SHADOW_ETCHED_IN;
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break;
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case GIMP_CHAIN_RIGHT:
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points[0].x -= SHORT_LINE;
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points[1].x = points[0].x + SHORT_LINE;
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points[1].y = points[0].y;
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points[2].x = points[1].x;
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points[2].y = (which_line == 1) ? widget->allocation.height - 1 : 0;
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shadow = GTK_SHADOW_ETCHED_OUT;
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break;
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case GIMP_CHAIN_TOP:
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points[0].y += SHORT_LINE;
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points[1].x = points[0].x;
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points[1].y = points[0].y - SHORT_LINE;
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points[2].x = (which_line == 1) ? widget->allocation.width - 1 : 0;
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points[2].y = points[1].y;
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shadow = GTK_SHADOW_ETCHED_OUT;
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break;
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case GIMP_CHAIN_BOTTOM:
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points[0].y -= SHORT_LINE;
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points[1].x = points[0].x;
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points[1].y = points[0].y + SHORT_LINE;
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points[2].x = (which_line == 1) ? widget->allocation.width - 1 : 0;
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points[2].y = points[1].y;
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shadow = GTK_SHADOW_ETCHED_IN;
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break;
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default:
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return FALSE;
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}
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if ( ((shadow == GTK_SHADOW_ETCHED_OUT) && (which_line == -1)) ||
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((shadow == GTK_SHADOW_ETCHED_IN) && (which_line == 1)) )
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{
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buf = points[0];
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points[0] = points[2];
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points[2] = buf;
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}
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gtk_paint_polygon (widget->style,
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widget->window,
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GTK_STATE_NORMAL,
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shadow,
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&eevent->area,
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widget,
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"chainbutton",
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points,
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3,
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FALSE);
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return TRUE;
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}
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