GtkColorChooser

GtkColorChooser — Interface implemented by widgets for choosing colors

Properties

GdkRGBA * rgba Read / Write
gboolean use-alpha Read / Write

Signals

Types and Values

Object Hierarchy

    GInterface
    ╰── GtkColorChooser

Prerequisites

GtkColorChooser requires GObject.

Known Implementations

GtkColorChooser is implemented by GtkColorButton, GtkColorChooserDialog and GtkColorChooserWidget.

Includes

#include <gtk/gtk.h>

Description

GtkColorChooser is an interface that is implemented by widgets for choosing colors. Depending on the situation, colors may be allowed to have alpha (translucency).

In GTK+, the main widgets that implement this interface are GtkColorChooserWidget, GtkColorChooserDialog and GtkColorButton.

Functions

gtk_color_chooser_get_rgba ()

void
gtk_color_chooser_get_rgba (GtkColorChooser *chooser,
                            GdkRGBA *color);

Gets the currently-selected color.

Parameters

chooser

a GtkColorChooser

 

color

a GdkRGBA to fill in with the current color.

[out]

Since: 3.4


gtk_color_chooser_set_rgba ()

void
gtk_color_chooser_set_rgba (GtkColorChooser *chooser,
                            const GdkRGBA *color);

Sets the color.

Parameters

chooser

a GtkColorChooser

 

color

the new color

 

Since: 3.4


gtk_color_chooser_get_use_alpha ()

gboolean
gtk_color_chooser_get_use_alpha (GtkColorChooser *chooser);

Returns whether the color chooser shows the alpha channel.

Parameters

chooser

a GtkColorChooser

 

Returns

TRUE if the color chooser uses the alpha channel, FALSE if not

Since: 3.4


gtk_color_chooser_set_use_alpha ()

void
gtk_color_chooser_set_use_alpha (GtkColorChooser *chooser,
                                 gboolean use_alpha);

Sets whether or not the color chooser should use the alpha channel.

Parameters

chooser

a GtkColorChooser

 

use_alpha

TRUE if color chooser should use alpha channel, FALSE if not

 

Since: 3.4


gtk_color_chooser_add_palette ()

void
gtk_color_chooser_add_palette (GtkColorChooser *chooser,
                               GtkOrientation orientation,
                               gint colors_per_line,
                               gint n_colors,
                               GdkRGBA *colors);

Adds a palette to the color chooser. If orientation is horizontal, the colors are grouped in rows, with colors_per_line colors in each row. If horizontal is FALSE, the colors are grouped in columns instead.

The default color palette of GtkColorChooserWidget has 27 colors, organized in columns of 3 colors. The default gray palette has 9 grays in a single row.

The layout of the color chooser widget works best when the palettes have 9-10 columns.

Calling this function for the first time has the side effect of removing the default color and gray palettes from the color chooser.

If colors is NULL, removes all previously added palettes.

Parameters

chooser

a GtkColorChooser

 

orientation

GTK_ORIENTATION_HORIZONTAL if the palette should be displayed in rows, GTK_ORIENTATION_VERTICAL for columns

 

colors_per_line

the number of colors to show in each row/column

 

n_colors

the total number of elements in colors

 

colors

the colors of the palette, or NULL.

[allow-none][array length=n_colors]

Since: 3.4

Types and Values

GtkColorChooser

typedef struct _GtkColorChooser GtkColorChooser;

Property Details

The “rgba” property

  “rgba”                     GdkRGBA *

The ::rgba property contains the currently selected color, as a GdkRGBA struct. The property can be set to change the current selection programmatically.

Flags: Read / Write

Since: 3.4


The “use-alpha” property

  “use-alpha”                gboolean

When ::use-alpha is TRUE, colors may have alpha (translucency) information. When it is FALSE, the GdkRGBA struct obtained via the “rgba” property will be forced to have alpha == 1.

Implementations are expected to show alpha by rendering the color over a non-uniform background (like a checkerboard pattern).

Flags: Read / Write

Default value: TRUE

Since: 3.4

Signal Details

The “color-activated” signal

void
user_function (GtkColorChooser *chooser,
               GdkRGBA         *color,
               gpointer         user_data)

Emitted when a color is activated from the color chooser. This usually happens when the user clicks a color swatch, or a color is selected and the user presses one of the keys Space, Shift+Space, Return or Enter.

Parameters

chooser

the object which received the signal

 

color

the color

 

user_data

user data set when the signal handler was connected.

 

Flags: Run First

Since: 3.4