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/* -*- mode: c; c-basic-offset: 4; -*-
*
* color-button.c - Interactive color selection button. This is a composite
* widget that shows a color sample inside a button. When
* the button is clicked, a color picker with auto-apply
* modifies the color sample and sends the 'changed' signal.
*
* Fyre - rendering and interactive exploration of chaotic functions
* Copyright (C) 2004-2006 David Trowbridge and Micah Dowty
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include "color-button.h"
#include "image-fu.h"
#include <gtk/gtk.h>
enum {
CHANGED_SIGNAL,
LAST_SIGNAL
};
static void color_button_class_init(ColorButtonClass *klass);
static void color_button_init(ColorButton *self);
static void color_button_activate(GtkWidget *widget, ColorButton *self);
static void color_changed(GtkWidget *widget, ColorButton *self);
static void color_response(GtkWidget *widget, gint response, ColorButton *self);
static void on_realize(GtkWidget *widget, ColorButton *self);
static void update_color_sample(ColorButton *self);
static guint color_button_signals[LAST_SIGNAL] = { 0 };
GType color_button_get_type(void) {
static GType cb_type = 0;
if (!cb_type) {
static const GTypeInfo cb_info = {
sizeof(ColorButtonClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) color_button_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof(ColorButton),
0,
(GInstanceInitFunc) color_button_init,
};
cb_type = g_type_register_static(GTK_TYPE_BUTTON, "ColorButton", &cb_info, 0);
}
return cb_type;
}
static void color_button_class_init(ColorButtonClass *klass) {
color_button_signals[CHANGED_SIGNAL] = g_signal_new("changed",
G_TYPE_FROM_CLASS(klass),
G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET(ColorButtonClass, color_button),
NULL,
NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
}
static void color_button_init(ColorButton *self) {
self->ignore_changes = FALSE;
g_signal_connect(G_OBJECT(self), "clicked", G_CALLBACK(color_button_activate), (gpointer) self);
self->frame = gtk_frame_new(NULL);
gtk_frame_set_shadow_type(GTK_FRAME(self->frame), GTK_SHADOW_IN);
gtk_container_add(GTK_CONTAINER(self), GTK_WIDGET(self->frame));
self->drawing_area = gtk_drawing_area_new();
gtk_drawing_area_size(GTK_DRAWING_AREA(self->drawing_area), 16, 16);
gtk_container_add(GTK_CONTAINER(self->frame), GTK_WIDGET(self->drawing_area));
g_signal_connect(self->drawing_area, "realize", G_CALLBACK(on_realize), self);
}
static void on_realize(GtkWidget *widget, ColorButton *self) {
update_color_sample(self);
}
static void update_color_sample(ColorButton *self) {
/* Composite together a pixbuf showing a sample of this color, with alpha,
* and set it as the drawing area's background pixmap.
*/
GdkPixbuf *color;
GdkPixmap *pixmap;
const int width = CHECKERBOARD_TILE_SIZE * 2;
const int height = CHECKERBOARD_TILE_SIZE * 2;
/* First make a 1x1 pixbuf of our color */
color = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8, width, height);
gdk_pixbuf_fill(color,
((self->color.red >> 8) << 24) |
((self->color.green >> 8) << 16) |
((self->color.blue >> 8) << 8) |
((self->alpha >> 8) ));
/* Blend this on top of a checkerboard pattern */
image_add_checkerboard(color);
/* Make a pixbuf out of it */
pixmap = gdk_pixmap_new(self->drawing_area->window, width, height, -1);
gdk_pixbuf_render_to_drawable(color, pixmap, self->drawing_area->style->fg_gc[GTK_STATE_NORMAL],
0, 0, 0, 0, width, height, GDK_RGB_DITHER_NORMAL, 0, 0);
/* Set it as a backing pixmap */
gdk_window_set_back_pixmap(self->drawing_area->window, pixmap, FALSE);
gdk_window_clear(self->drawing_area->window);
gdk_pixbuf_unref(color);
gdk_pixmap_unref(pixmap);
}
GtkWidget* color_button_new_with_defaults(const char *title, GdkColor *default_color, guint16 default_alpha) {
ColorButton *self = g_object_new(color_button_get_type(), NULL);
self->title = g_strdup(title);
self->color = *default_color;
self->alpha = default_alpha;
return GTK_WIDGET(self);
}
GtkWidget* color_button_new(const char *title) {
GdkColor black = {0,0,0,0};
return color_button_new_with_defaults(title, &black, 0xFFFF);
}
static void color_button_activate(GtkWidget *widget, ColorButton *self) {
GtkWidget *colorsel;
/* Only allow one dialog open at a time */
if (self->dialog)
return;
self->dialog = gtk_color_selection_dialog_new(self->title);
colorsel = GTK_COLOR_SELECTION_DIALOG(self->dialog)->colorsel;
gtk_color_selection_set_has_opacity_control(GTK_COLOR_SELECTION(colorsel), TRUE);
g_signal_connect(G_OBJECT(self->dialog), "response", G_CALLBACK(color_response), (gpointer) self);
gtk_color_selection_set_update_policy(GTK_COLOR_SELECTION(colorsel), GTK_UPDATE_CONTINUOUS);
g_signal_connect(G_OBJECT(colorsel), "color-changed", G_CALLBACK(color_changed), (gpointer) self);
/* Set the current and previous colors in the dialog */
self->previous_color = self->color;
self->previous_alpha = self->alpha;
self->ignore_changes = TRUE;
gtk_color_selection_set_current_alpha(GTK_COLOR_SELECTION(colorsel), self->alpha);
gtk_color_selection_set_previous_alpha(GTK_COLOR_SELECTION(colorsel), self->previous_alpha);
gtk_color_selection_set_current_color(GTK_COLOR_SELECTION(colorsel), &self->color);
gtk_color_selection_set_previous_color(GTK_COLOR_SELECTION(colorsel), &self->previous_color);
self->ignore_changes = FALSE;
/* Is there a better way to hide the help button? */
gtk_widget_show_all(self->dialog);
gtk_widget_hide(GTK_COLOR_SELECTION_DIALOG(self->dialog)->help_button);
}
static void color_response(GtkWidget *widget, gint response, ColorButton *self) {
if (response == GTK_RESPONSE_CANCEL) {
color_button_set_color(self, &self->previous_color);
color_button_set_alpha(self, self->previous_alpha);
}
gtk_widget_destroy(self->dialog);
self->dialog = NULL;
}
static void color_changed(GtkWidget *widget, ColorButton *self) {
GdkColor gcolor;
if (!self->ignore_changes) {
gtk_color_selection_get_current_color(GTK_COLOR_SELECTION(widget), &gcolor);
self->alpha = gtk_color_selection_get_current_alpha(GTK_COLOR_SELECTION(widget));
color_button_set_color(self, &gcolor);
}
}
void color_button_get_color(ColorButton *self, GdkColor *c) {
*c = self->color;
}
guint16 color_button_get_alpha(ColorButton *self) {
return self->alpha;
}
void color_button_set_color(ColorButton *self, GdkColor *c) {
self->color = *c;
update_color_sample(self);
g_signal_emit(G_OBJECT(self), color_button_signals[CHANGED_SIGNAL], 0);
}
void color_button_set_alpha(ColorButton *self, guint16 alpha) {
self->alpha = alpha;
update_color_sample(self);
g_signal_emit(G_OBJECT(self), color_button_signals[CHANGED_SIGNAL], 0);
}
void color_button_set_color_and_alpha(ColorButton *self, GdkColor *c, guint16 alpha) {
self->alpha = alpha;
self->color = *c;
update_color_sample(self);
g_signal_emit(G_OBJECT(self), color_button_signals[CHANGED_SIGNAL], 0);
}
/* The End */
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