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gtk2/gtk/gtkcolorbutton.c
Timm Bäder 2cd1a984cf set clip of more widgets
2017-07-19 21:27:11 -04:00

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/*
* GTK - The GIMP Toolkit
* Copyright (C) 1998, 1999 Red Hat, Inc.
* All rights reserved.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
/* Color picker button for GNOME
*
* Author: Federico Mena <federico@nuclecu.unam.mx>
*
* Modified by the GTK+ Team and others 2003. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gtkcolorbutton.h"
#include "gtkbutton.h"
#include "gtkmain.h"
#include "gtkcolorchooser.h"
#include "gtkcolorchooserprivate.h"
#include "gtkcolorchooserdialog.h"
#include "gtkcolorswatchprivate.h"
#include "gtkdnd.h"
#include "gtkdragdest.h"
#include "gtkdragsource.h"
#include "gtkmarshalers.h"
#include "gtkprivate.h"
#include "gtkintl.h"
/**
* SECTION:gtkcolorbutton
* @Short_description: A button to launch a color selection dialog
* @Title: GtkColorButton
* @See_also: #GtkColorSelectionDialog, #GtkFontButton
*
* The #GtkColorButton is a button which displays the currently selected
* color and allows to open a color selection dialog to change the color.
* It is suitable widget for selecting a color in a preference dialog.
*
* # CSS nodes
*
* GtkColorButton has a single CSS node with name button. To differentiate
* it from a plain #GtkButton, it gets the .color style class.
*/
struct _GtkColorButtonPrivate
{
GtkWidget *button;
GtkWidget *swatch; /* Widget where we draw the color sample */
GtkWidget *cs_dialog; /* Color selection dialog */
gchar *title; /* Title for the color selection window */
GdkRGBA rgba;
guint use_alpha : 1; /* Use alpha or not */
guint show_editor : 1;
};
/* Properties */
enum
{
PROP_0,
PROP_USE_ALPHA,
PROP_TITLE,
PROP_RGBA,
PROP_SHOW_EDITOR
};
/* Signals */
enum
{
COLOR_SET,
LAST_SIGNAL
};
/* gobject signals */
static void gtk_color_button_finalize (GObject *object);
static void gtk_color_button_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_color_button_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec);
/* gtkbutton signals */
static void gtk_color_button_clicked (GtkButton *button,
gpointer user_data);
/* source side drag signals */
static void gtk_color_button_drag_begin (GtkWidget *widget,
GdkDragContext *context,
gpointer data);
static void gtk_color_button_drag_data_get (GtkWidget *widget,
GdkDragContext *context,
GtkSelectionData *selection_data,
guint info,
guint time,
GtkColorButton *button);
/* target side drag signals */
static void gtk_color_button_drag_data_received (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
GtkSelectionData *selection_data,
guint info,
guint32 time,
GtkColorButton *button);
static guint color_button_signals[LAST_SIGNAL] = { 0 };
static const GtkTargetEntry drop_types[] = { { (char *) "application/x-color", 0, 0 } };
static void gtk_color_button_iface_init (GtkColorChooserInterface *iface);
G_DEFINE_TYPE_WITH_CODE (GtkColorButton, gtk_color_button, GTK_TYPE_WIDGET,
G_ADD_PRIVATE (GtkColorButton)
G_IMPLEMENT_INTERFACE (GTK_TYPE_COLOR_CHOOSER,
gtk_color_button_iface_init))
static void
gtk_color_button_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkColorButton *button = GTK_COLOR_BUTTON (widget);
GtkColorButtonPrivate *priv = gtk_color_button_get_instance_private (button);
gtk_widget_measure (priv->button, orientation, for_size,
minimum, natural,
minimum_baseline, natural_baseline);
}
static void
gtk_color_button_snapshot (GtkWidget *widget,
GtkSnapshot *snapshot)
{
GtkColorButton *button = GTK_COLOR_BUTTON (widget);
GtkColorButtonPrivate *priv = gtk_color_button_get_instance_private (button);
gtk_widget_snapshot_child (widget, priv->button, snapshot);
}
static void
gtk_color_button_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkColorButton *button = GTK_COLOR_BUTTON (widget);
GtkColorButtonPrivate *priv = gtk_color_button_get_instance_private (button);
GtkAllocation clip = *allocation;
gtk_widget_size_allocate (priv->button, allocation);
gtk_widget_get_clip (priv->button, &clip);
gtk_widget_set_clip (widget, &clip);
}
static void
gtk_color_button_class_init (GtkColorButtonClass *klass)
{
GObjectClass *gobject_class;
GtkWidgetClass *widget_class;
gobject_class = G_OBJECT_CLASS (klass);
widget_class = GTK_WIDGET_CLASS (klass);
gobject_class->get_property = gtk_color_button_get_property;
gobject_class->set_property = gtk_color_button_set_property;
gobject_class->finalize = gtk_color_button_finalize;
widget_class->snapshot = gtk_color_button_snapshot;
widget_class->measure = gtk_color_button_measure;
widget_class->size_allocate = gtk_color_button_size_allocate;
klass->color_set = NULL;
/**
* GtkColorButton:use-alpha:
*
* If this property is set to %TRUE, the color swatch on the button is
* rendered against a checkerboard background to show its opacity and
* the opacity slider is displayed in the color selection dialog.
*
* Since: 2.4
*/
g_object_class_install_property (gobject_class,
PROP_USE_ALPHA,
g_param_spec_boolean ("use-alpha", P_("Use alpha"),
P_("Whether to give the color an alpha value"),
FALSE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
/**
* GtkColorButton:title:
*
* The title of the color selection dialog
*
* Since: 2.4
*/
g_object_class_install_property (gobject_class,
PROP_TITLE,
g_param_spec_string ("title",
P_("Title"),
P_("The title of the color selection dialog"),
_("Pick a Color"),
GTK_PARAM_READWRITE));
/**
* GtkColorButton:rgba:
*
* The RGBA color.
*
* Since: 3.0
*/
g_object_class_install_property (gobject_class,
PROP_RGBA,
g_param_spec_boxed ("rgba",
P_("Current RGBA Color"),
P_("The selected RGBA color"),
GDK_TYPE_RGBA,
GTK_PARAM_READWRITE));
/**
* GtkColorButton::color-set:
* @widget: the object which received the signal.
*
* The ::color-set signal is emitted when the user selects a color.
* When handling this signal, use gtk_color_button_get_rgba() to
* find out which color was just selected.
*
* Note that this signal is only emitted when the user
* changes the color. If you need to react to programmatic color changes
* as well, use the notify::color signal.
*
* Since: 2.4
*/
color_button_signals[COLOR_SET] = g_signal_new (I_("color-set"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GtkColorButtonClass, color_set),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
/**
* GtkColorButton:show-editor:
*
* Set this property to %TRUE to skip the palette
* in the dialog and go directly to the color editor.
*
* This property should be used in cases where the palette
* in the editor would be redundant, such as when the color
* button is already part of a palette.
*
* Since: 3.20
*/
g_object_class_install_property (gobject_class,
PROP_SHOW_EDITOR,
g_param_spec_boolean ("show-editor", P_("Show Editor"),
P_("Whether to show the color editor right away"),
FALSE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
}
static void
gtk_color_button_drag_data_received (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
GtkSelectionData *selection_data,
guint info,
guint32 time,
GtkColorButton *button)
{
GtkColorButtonPrivate *priv = button->priv;
gint length;
guint16 *dropped;
length = gtk_selection_data_get_length (selection_data);
if (length < 0)
return;
/* We accept drops with the wrong format, since the KDE color
* chooser incorrectly drops application/x-color with format 8.
*/
if (length != 8)
{
g_warning ("%s: Received invalid color data", G_STRFUNC);
return;
}
dropped = (guint16 *) gtk_selection_data_get_data (selection_data);
priv->rgba.red = dropped[0] / 65535.;
priv->rgba.green = dropped[1] / 65535.;
priv->rgba.blue = dropped[2] / 65535.;
priv->rgba.alpha = dropped[3] / 65535.;
gtk_color_swatch_set_rgba (GTK_COLOR_SWATCH (priv->swatch), &priv->rgba);
g_signal_emit (button, color_button_signals[COLOR_SET], 0);
g_object_freeze_notify (G_OBJECT (button));
g_object_notify (G_OBJECT (button), "rgba");
g_object_thaw_notify (G_OBJECT (button));
}
static void
set_color_icon (GdkDragContext *context,
const GdkRGBA *rgba)
{
cairo_surface_t *surface;
cairo_t *cr;
surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 48, 32);
cr = cairo_create (surface);
gdk_cairo_set_source_rgba (cr, rgba);
cairo_paint (cr);
gtk_drag_set_icon_surface (context, surface);
cairo_destroy (cr);
cairo_surface_destroy (surface);
}
static void
gtk_color_button_drag_begin (GtkWidget *widget,
GdkDragContext *context,
gpointer data)
{
GtkColorButton *button = data;
set_color_icon (context, &button->priv->rgba);
}
static void
gtk_color_button_drag_data_get (GtkWidget *widget,
GdkDragContext *context,
GtkSelectionData *selection_data,
guint info,
guint time,
GtkColorButton *button)
{
GtkColorButtonPrivate *priv = button->priv;
guint16 dropped[4];
dropped[0] = (guint16) (priv->rgba.red * 65535);
dropped[1] = (guint16) (priv->rgba.green * 65535);
dropped[2] = (guint16) (priv->rgba.blue * 65535);
dropped[3] = (guint16) (priv->rgba.alpha * 65535);
gtk_selection_data_set (selection_data,
gtk_selection_data_get_target (selection_data),
16, (guchar *)dropped, 8);
}
static void
gtk_color_button_init (GtkColorButton *button)
{
GtkColorButtonPrivate *priv;
PangoLayout *layout;
PangoRectangle rect;
GtkStyleContext *context;
gtk_widget_set_has_window (GTK_WIDGET (button), FALSE);
/* Create the widgets */
priv = button->priv = gtk_color_button_get_instance_private (button);
priv->button = gtk_button_new ();
g_signal_connect (priv->button, "clicked", G_CALLBACK (gtk_color_button_clicked), button);
gtk_widget_set_parent (priv->button, GTK_WIDGET (button));
priv->swatch = gtk_color_swatch_new ();
layout = gtk_widget_create_pango_layout (GTK_WIDGET (button), "Black");
pango_layout_get_pixel_extents (layout, NULL, &rect);
g_object_unref (layout);
gtk_widget_set_size_request (priv->swatch, rect.width, rect.height);
gtk_container_add (GTK_CONTAINER (priv->button), priv->swatch);
button->priv->title = g_strdup (_("Pick a Color")); /* default title */
/* Start with opaque black, alpha disabled */
priv->rgba.red = 0;
priv->rgba.green = 0;
priv->rgba.blue = 0;
priv->rgba.alpha = 1;
priv->use_alpha = FALSE;
gtk_drag_dest_set (priv->button,
GTK_DEST_DEFAULT_MOTION |
GTK_DEST_DEFAULT_HIGHLIGHT |
GTK_DEST_DEFAULT_DROP,
drop_types, 1, GDK_ACTION_COPY);
gtk_drag_source_set (priv->button,
GDK_BUTTON1_MASK|GDK_BUTTON3_MASK,
drop_types, 1,
GDK_ACTION_COPY);
g_signal_connect (priv->button, "drag-begin",
G_CALLBACK (gtk_color_button_drag_begin), button);
g_signal_connect (priv->button, "drag-data-received",
G_CALLBACK (gtk_color_button_drag_data_received), button);
g_signal_connect (priv->button, "drag-data-get",
G_CALLBACK (gtk_color_button_drag_data_get), button);
context = gtk_widget_get_style_context (GTK_WIDGET (priv->button));
gtk_style_context_add_class (context, "color");
}
static void
gtk_color_button_finalize (GObject *object)
{
GtkColorButton *button = GTK_COLOR_BUTTON (object);
GtkColorButtonPrivate *priv = button->priv;
if (priv->cs_dialog != NULL)
gtk_widget_destroy (priv->cs_dialog);
g_free (priv->title);
gtk_widget_unparent (priv->button);
G_OBJECT_CLASS (gtk_color_button_parent_class)->finalize (object);
}
/**
* gtk_color_button_new:
*
* Creates a new color button.
*
* This returns a widget in the form of a small button containing
* a swatch representing the current selected color. When the button
* is clicked, a color-selection dialog will open, allowing the user
* to select a color. The swatch will be updated to reflect the new
* color when the user finishes.
*
* Returns: a new color button
*
* Since: 2.4
*/
GtkWidget *
gtk_color_button_new (void)
{
return g_object_new (GTK_TYPE_COLOR_BUTTON, NULL);
}
/**
* gtk_color_button_new_with_rgba:
* @rgba: A #GdkRGBA to set the current color with
*
* Creates a new color button.
*
* Returns: a new color button
*
* Since: 3.0
*/
GtkWidget *
gtk_color_button_new_with_rgba (const GdkRGBA *rgba)
{
return g_object_new (GTK_TYPE_COLOR_BUTTON, "rgba", rgba, NULL);
}
static gboolean
dialog_destroy (GtkWidget *widget,
gpointer data)
{
GtkColorButton *button = GTK_COLOR_BUTTON (data);
button->priv->cs_dialog = NULL;
return FALSE;
}
static void
dialog_response (GtkDialog *dialog,
gint response,
gpointer data)
{
if (response == GTK_RESPONSE_CANCEL)
gtk_widget_hide (GTK_WIDGET (dialog));
else if (response == GTK_RESPONSE_OK)
{
GtkColorButton *button = GTK_COLOR_BUTTON (data);
GtkColorButtonPrivate *priv = button->priv;
gtk_color_chooser_get_rgba (GTK_COLOR_CHOOSER (dialog), &priv->rgba);
gtk_color_swatch_set_rgba (GTK_COLOR_SWATCH (priv->swatch), &priv->rgba);
gtk_widget_hide (GTK_WIDGET (dialog));
g_object_ref (button);
g_signal_emit (button, color_button_signals[COLOR_SET], 0);
g_object_freeze_notify (G_OBJECT (button));
g_object_notify (G_OBJECT (button), "rgba");
g_object_thaw_notify (G_OBJECT (button));
g_object_unref (button);
}
}
/* Create the dialog and connects its buttons */
static void
ensure_dialog (GtkColorButton *button)
{
GtkColorButtonPrivate *priv = button->priv;
GtkWidget *parent, *dialog;
if (priv->cs_dialog != NULL)
return;
parent = gtk_widget_get_toplevel (GTK_WIDGET (button));
priv->cs_dialog = dialog = gtk_color_chooser_dialog_new (priv->title, NULL);
if (gtk_widget_is_toplevel (parent) && GTK_IS_WINDOW (parent))
{
if (GTK_WINDOW (parent) != gtk_window_get_transient_for (GTK_WINDOW (dialog)))
gtk_window_set_transient_for (GTK_WINDOW (dialog), GTK_WINDOW (parent));
gtk_window_set_modal (GTK_WINDOW (dialog),
gtk_window_get_modal (GTK_WINDOW (parent)));
}
g_signal_connect (dialog, "response",
G_CALLBACK (dialog_response), button);
g_signal_connect (dialog, "destroy",
G_CALLBACK (dialog_destroy), button);
}
static void
gtk_color_button_clicked (GtkButton *b,
gpointer user_data)
{
GtkColorButton *button = user_data;
GtkColorButtonPrivate *priv = button->priv;
/* if dialog already exists, make sure it's shown and raised */
ensure_dialog (button);
g_object_set (priv->cs_dialog, "show-editor", priv->show_editor, NULL);
gtk_color_chooser_set_use_alpha (GTK_COLOR_CHOOSER (priv->cs_dialog), priv->use_alpha);
gtk_color_chooser_set_rgba (GTK_COLOR_CHOOSER (priv->cs_dialog), &priv->rgba);
gtk_window_present (GTK_WINDOW (priv->cs_dialog));
}
static void
gtk_color_button_set_rgba (GtkColorChooser *chooser,
const GdkRGBA *rgba)
{
GtkColorButtonPrivate *priv;
g_return_if_fail (GTK_IS_COLOR_BUTTON (chooser));
g_return_if_fail (rgba != NULL);
priv = GTK_COLOR_BUTTON (chooser)->priv;
priv->rgba = *rgba;
gtk_color_swatch_set_rgba (GTK_COLOR_SWATCH (priv->swatch), &priv->rgba);
g_object_notify (G_OBJECT (chooser), "rgba");
}
static void
gtk_color_button_get_rgba (GtkColorChooser *chooser,
GdkRGBA *rgba)
{
g_return_if_fail (GTK_IS_COLOR_BUTTON (chooser));
g_return_if_fail (rgba != NULL);
*rgba = GTK_COLOR_BUTTON (chooser)->priv->rgba;
}
static void
set_use_alpha (GtkColorButton *button,
gboolean use_alpha)
{
GtkColorButtonPrivate *priv = button->priv;
use_alpha = (use_alpha != FALSE);
if (priv->use_alpha != use_alpha)
{
priv->use_alpha = use_alpha;
gtk_color_swatch_set_use_alpha (GTK_COLOR_SWATCH (priv->swatch), use_alpha);
g_object_notify (G_OBJECT (button), "use-alpha");
}
}
/**
* gtk_color_button_set_title:
* @button: a #GtkColorButton
* @title: String containing new window title
*
* Sets the title for the color selection dialog.
*
* Since: 2.4
*/
void
gtk_color_button_set_title (GtkColorButton *button,
const gchar *title)
{
GtkColorButtonPrivate *priv = button->priv;
gchar *old_title;
g_return_if_fail (GTK_IS_COLOR_BUTTON (button));
old_title = priv->title;
priv->title = g_strdup (title);
g_free (old_title);
if (priv->cs_dialog)
gtk_window_set_title (GTK_WINDOW (priv->cs_dialog), priv->title);
g_object_notify (G_OBJECT (button), "title");
}
/**
* gtk_color_button_get_title:
* @button: a #GtkColorButton
*
* Gets the title of the color selection dialog.
*
* Returns: An internal string, do not free the return value
*
* Since: 2.4
*/
const gchar *
gtk_color_button_get_title (GtkColorButton *button)
{
g_return_val_if_fail (GTK_IS_COLOR_BUTTON (button), NULL);
return button->priv->title;
}
static void
gtk_color_button_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec)
{
GtkColorButton *button = GTK_COLOR_BUTTON (object);
switch (param_id)
{
case PROP_USE_ALPHA:
set_use_alpha (button, g_value_get_boolean (value));
break;
case PROP_TITLE:
gtk_color_button_set_title (button, g_value_get_string (value));
break;
case PROP_RGBA:
gtk_color_chooser_set_rgba (GTK_COLOR_CHOOSER (button), g_value_get_boxed (value));
break;
case PROP_SHOW_EDITOR:
{
gboolean show_editor = g_value_get_boolean (value);
if (button->priv->show_editor != show_editor)
{
button->priv->show_editor = show_editor;
g_object_notify (object, "show-editor");
}
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
break;
}
}
static void
gtk_color_button_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec)
{
GtkColorButton *button = GTK_COLOR_BUTTON (object);
switch (param_id)
{
case PROP_USE_ALPHA:
g_value_set_boolean (value, button->priv->use_alpha);
break;
case PROP_TITLE:
g_value_set_string (value, gtk_color_button_get_title (button));
break;
case PROP_RGBA:
{
GdkRGBA rgba;
gtk_color_chooser_get_rgba (GTK_COLOR_CHOOSER (button), &rgba);
g_value_set_boxed (value, &rgba);
}
break;
case PROP_SHOW_EDITOR:
g_value_set_boolean (value, button->priv->show_editor);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
break;
}
}
static void
gtk_color_button_add_palette (GtkColorChooser *chooser,
GtkOrientation orientation,
gint colors_per_line,
gint n_colors,
GdkRGBA *colors)
{
GtkColorButton *button = GTK_COLOR_BUTTON (chooser);
ensure_dialog (button);
gtk_color_chooser_add_palette (GTK_COLOR_CHOOSER (button->priv->cs_dialog),
orientation, colors_per_line, n_colors, colors);
}
static void
gtk_color_button_iface_init (GtkColorChooserInterface *iface)
{
iface->get_rgba = gtk_color_button_get_rgba;
iface->set_rgba = gtk_color_button_set_rgba;
iface->add_palette = gtk_color_button_add_palette;
}
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