263 lines
7.9 KiB
C
263 lines
7.9 KiB
C
/* GTK - The GIMP Toolkit
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*
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* Copyright (C) 2012, Red Hat, Inc.
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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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* Lesser 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gtkcolorchooser.h"
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#include "gtkcolorchooserprivate.h"
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#include "gtkintl.h"
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#include "gtktypebuiltins.h"
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#include "gtkprivate.h"
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/**
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* SECTION:gtkcolorchooser
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* @Short_description: Interface implemented by widgets for choosing colors
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* @Title: GtkColorChooser
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* @See_also: #GtkColorChooserDialog, #GtkColorChooserWidget, #GtkColorButton
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*
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* #GtkColorChooser is an interface that is implemented by widgets
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* for choosing colors. Depending on the situation, colors may be
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* allowed to have alpha (translucency).
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*
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* In GTK+, the main widgets that implement this interface are
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* #GtkColorChooserWidget, #GtkColorChooserDialog and #GtkColorButton.
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*
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* Since: 3.4
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*/
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enum
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{
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COLOR_ACTIVATED,
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LAST_SIGNAL
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};
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static guint signals[LAST_SIGNAL];
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G_DEFINE_INTERFACE (GtkColorChooser, gtk_color_chooser, G_TYPE_OBJECT);
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static void
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gtk_color_chooser_default_init (GtkColorChooserInterface *iface)
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{
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/**
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* GtkColorChooser:rgba:
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*
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* The ::rgba property contains the currently selected color,
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* as a #GdkRGBA struct. The property can be set to change
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* the current selection programmatically.
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*
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* Since: 3.4
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*/
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g_object_interface_install_property (iface,
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g_param_spec_boxed ("rgba",
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P_("Color"),
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P_("Current color, as a GdkRGBA"),
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GDK_TYPE_RGBA,
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GTK_PARAM_READWRITE));
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/**
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* GtkColorChooser:use-alpha:
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*
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* When ::use-alpha is %TRUE, colors may have alpha (translucency)
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* information. When it is %FALSE, the #GdkRGBA struct obtained
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* via the #GtkColorChooser:rgba property will be forced to have
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* alpha == 1.
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*
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* Implementations are expected to show alpha by rendering the color
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* over a non-uniform background (like a checkerboard pattern).
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*
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* Since: 3.4
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*/
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g_object_interface_install_property (iface,
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g_param_spec_boolean ("use-alpha",
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P_("Use alpha"),
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P_("Whether alpha should be shown"),
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TRUE,
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GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
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/**
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* GtkColorChooser::color-activated:
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* @chooser: the object which received the signal
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* @color: the color
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*
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* Emitted when a color is activated from the color chooser.
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* This usually happens when the user clicks a color swatch,
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* or a color is selected and the user presses one of the keys
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* Space, Shift+Space, Return or Enter.
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*
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* Since: 3.4
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*/
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signals[COLOR_ACTIVATED] =
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g_signal_new ("color-activated",
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GTK_TYPE_COLOR_CHOOSER,
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G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (GtkColorChooserInterface, color_activated),
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NULL, NULL,
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NULL,
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G_TYPE_NONE,
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1, GDK_TYPE_RGBA);
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}
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void
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_gtk_color_chooser_color_activated (GtkColorChooser *chooser,
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const GdkRGBA *color)
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{
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g_signal_emit (chooser, signals[COLOR_ACTIVATED], 0, color);
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}
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/**
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* gtk_color_chooser_get_rgba:
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* @chooser: a #GtkColorChooser
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* @color: (out): a #GdkRGBA to fill in with the current color
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*
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* Gets the currently-selected color.
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*
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* Since: 3.4
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*/
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void
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gtk_color_chooser_get_rgba (GtkColorChooser *chooser,
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GdkRGBA *color)
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{
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g_return_if_fail (GTK_IS_COLOR_CHOOSER (chooser));
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GTK_COLOR_CHOOSER_GET_IFACE (chooser)->get_rgba (chooser, color);
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}
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/**
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* gtk_color_chooser_set_rgba:
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* @chooser: a #GtkColorChooser
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* @color: the new color
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*
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* Sets the color.
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*
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* Since: 3.4
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*/
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void
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gtk_color_chooser_set_rgba (GtkColorChooser *chooser,
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const GdkRGBA *color)
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{
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g_return_if_fail (GTK_IS_COLOR_CHOOSER (chooser));
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g_return_if_fail (color != NULL);
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GTK_COLOR_CHOOSER_GET_IFACE (chooser)->set_rgba (chooser, color);
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}
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/**
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* gtk_color_chooser_get_use_alpha:
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* @chooser: a #GtkColorChooser
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*
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* Returns whether the color chooser shows the alpha channel.
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*
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* Returns: %TRUE if the color chooser uses the alpha channel,
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* %FALSE if not
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*
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* Since: 3.4
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*/
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gboolean
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gtk_color_chooser_get_use_alpha (GtkColorChooser *chooser)
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{
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gboolean use_alpha;
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g_return_val_if_fail (GTK_IS_COLOR_CHOOSER (chooser), TRUE);
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g_object_get (chooser, "use-alpha", &use_alpha, NULL);
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return use_alpha;
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}
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/**
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* gtk_color_chooser_set_use_alpha:
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* @chooser: a #GtkColorChooser
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* @use_alpha: %TRUE if color chooser should use alpha channel, %FALSE if not
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*
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* Sets whether or not the color chooser should use the alpha channel.
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*
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* Since: 3.4
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*/
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void
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gtk_color_chooser_set_use_alpha (GtkColorChooser *chooser,
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gboolean use_alpha)
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{
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g_return_if_fail (GTK_IS_COLOR_CHOOSER (chooser));
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g_object_set (chooser, "use-alpha", use_alpha, NULL);
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}
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/**
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* gtk_color_chooser_add_palette:
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* @chooser: a #GtkColorChooser
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* @orientation: %GTK_ORIENTATION_HORIZONTAL if the palette should
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* be displayed in rows, %GTK_ORIENTATION_VERTICAL for columns
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* @colors_per_line: the number of colors to show in each row/column
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* @n_colors: the total number of elements in @colors
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* @colors: (allow-none) (array length=n_colors): the colors of the palette, or %NULL
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*
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* Adds a palette to the color chooser. If @orientation is horizontal,
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* the colors are grouped in rows, with @colors_per_line colors
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* in each row. If @horizontal is %FALSE, the colors are grouped
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* in columns instead.
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*
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* The default color palette of #GtkColorChooserWidget has
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* 27 colors, organized in columns of 3 colors. The default gray
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* palette has 9 grays in a single row.
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*
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* The layout of the color chooser widget works best when the
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* palettes have 9-10 columns.
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*
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* Calling this function for the first time has the
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* side effect of removing the default color and gray palettes
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* from the color chooser.
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*
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* If @colors is %NULL, removes all previously added palettes.
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*
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* Since: 3.4
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*/
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void
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gtk_color_chooser_add_palette (GtkColorChooser *chooser,
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GtkOrientation orientation,
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gint colors_per_line,
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gint n_colors,
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GdkRGBA *colors)
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{
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g_return_if_fail (GTK_IS_COLOR_CHOOSER (chooser));
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if (GTK_COLOR_CHOOSER_GET_IFACE (chooser)->add_palette)
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GTK_COLOR_CHOOSER_GET_IFACE (chooser)->add_palette (chooser, orientation, colors_per_line, n_colors, colors);
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}
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cairo_pattern_t *
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_gtk_color_chooser_get_checkered_pattern (void)
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{
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/* need to respect pixman's stride being a multiple of 4 */
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static unsigned char data[8] = { 0xFF, 0x00, 0x00, 0x00,
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0x00, 0xFF, 0x00, 0x00 };
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static cairo_surface_t *checkered = NULL;
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cairo_pattern_t *pattern;
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if (checkered == NULL)
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checkered = cairo_image_surface_create_for_data (data,
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CAIRO_FORMAT_A8,
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2, 2, 4);
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pattern = cairo_pattern_create_for_surface (checkered);
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cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
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cairo_pattern_set_filter (pattern, CAIRO_FILTER_NEAREST);
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return pattern;
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}
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