GTK+ Reference Manual
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# GtkColorSelection

## Name

GtkColorSelection -- a widget used to select a color.

## Synopsis

    #include <gtk/gtk.h>

    struct      GtkColorSelection;
    GtkWidget*  gtk_color_selection_new         (void);
    void        gtk_color_selection_set_update_policy
                                                (GtkColorSelection *colorsel,
                                                 GtkUpdateType policy);
    void        gtk_color_selection_set_has_opacity_control
                                                (GtkColorSelection *colorsel,
                                                 gboolean has_opacity);
    gboolean    gtk_color_selection_get_has_opacity_control
                                                (GtkColorSelection *colorsel);
    void        gtk_color_selection_set_has_palette
                                                (GtkColorSelection *colorsel,
                                                 gboolean has_palette);
    gboolean    gtk_color_selection_get_has_palette
                                                (GtkColorSelection *colorsel);
    guint16     gtk_color_selection_get_current_alpha
                                                (GtkColorSelection *colorsel);
    void        gtk_color_selection_set_current_alpha
                                                (GtkColorSelection *colorsel,
                                                 guint16 alpha);
    void        gtk_color_selection_get_current_color
                                                (GtkColorSelection *colorsel,
                                                 GdkColor *color);
    void        gtk_color_selection_set_current_color
                                                (GtkColorSelection *colorsel,
                                                 GdkColor *color);
    guint16     gtk_color_selection_get_previous_alpha
                                                (GtkColorSelection *colorsel);
    void        gtk_color_selection_set_previous_alpha
                                                (GtkColorSelection *colorsel,
                                                 guint16 alpha);
    void        gtk_color_selection_get_previous_color
                                                (GtkColorSelection *colorsel,
                                                 GdkColor *color);
    void        gtk_color_selection_set_previous_color
                                                (GtkColorSelection *colorsel,
                                                 GdkColor *color);
    gboolean    gtk_color_selection_is_adjusting
                                                (GtkColorSelection *colorsel);
    gboolean    gtk_color_selection_palette_from_string
                                                (const gchar *str,
                                                 GdkColor **colors,
                                                 gint *n_colors);
    gchar*      gtk_color_selection_palette_to_string
                                                (const GdkColor *colors,
                                                 gint n_colors);
    GtkColorSelectionChangePaletteFunc gtk_color_selection_set_change_palette_hook
                                                (GtkColorSelectionChangePaletteFunc func);
    void        (*GtkColorSelectionChangePaletteFunc)
                                                (const GdkColor *colors,
                                                 gint n_colors);
    GtkColorSelectionChangePaletteWithScreenFunc gtk_color_selection_set_change_palette_with_screen_hook
                                                (GtkColorSelectionChangePaletteWithScreenFunc func);
    void        (*GtkColorSelectionChangePaletteWithScreenFunc)
                                                (GdkScreen *screen,
                                                 const GdkColor *colors,
                                                 gint n_colors);
    void        gtk_color_selection_set_color   (GtkColorSelection *colorsel,
                                                 gdouble *color);
    void        gtk_color_selection_get_color   (GtkColorSelection *colorsel,
                                                 gdouble *color);

## Object Hierarchy

      GObject
       +----GtkObject
             +----GtkWidget
                   +----GtkContainer
                         +----GtkBox
                               +----GtkVBox
                                     +----GtkColorSelection

## Properties

      "has-palette"          gboolean             : Read / Write
      "has-opacity-control"  gboolean             : Read / Write
      "current-color"        GdkColor             : Read / Write
      "current-alpha"        guint                : Read / Write

## Signal Prototypes

    "color-changed"
                void        user_function      (GtkColorSelection *colorselection,
                                                gpointer user_data);

## Description

The GtkColorSelection is a widget that is used to select a color. It consists of a color wheel and number of sliders and entry boxes for color parameters such as hue, saturation, value, red, green, blue, and opacity. It is found on the standard color selection dialog box GtkColorSelectionDialog.

## Details

### struct GtkColorSelection

    struct GtkColorSelection;

The GtkColorSelection struct contains private data only, and should be accessed using the functions below.

### gtk_color_selection_new ()

    GtkWidget*  gtk_color_selection_new         (void);

Creates a new GtkColorSelection.

Returns : | a new GtkColorSelection

### gtk_color_selection_set_update_policy ()

    void        gtk_color_selection_set_update_policy
                                                (GtkColorSelection *colorsel,
                                                 GtkUpdateType policy);

Warning
`gtk_color_selection_set_update_policy` is deprecated and should not be used in newly-written code.

Sets the policy controlling when the color_changed signals are emitted. The available policies are:

- `GTK_UPDATE_CONTINUOUS` - signals are sent continuously as the color selection changes.

- `GTK_UPDATE_DISCONTINUOUS` - signals are sent only when the mouse button is released.

- `GTK_UPDATE_DELAYED` - signals are sent when the mouse button is released or when the mouse has been motionless for a period of time.

`colorsel` : | a GtkColorSelection.
`policy` : | a GtkUpdateType value indicating the desired policy.

### gtk_color_selection_set_has_opacity_control ()

    void        gtk_color_selection_set_has_opacity_control
                                                (GtkColorSelection *colorsel,
                                                 gboolean has_opacity);

Sets the `colorsel` to use or not use opacity.

`colorsel` : | a GtkColorSelection.
`has_opacity` : | `TRUE` if `colorsel` can set the opacity, `FALSE` otherwise.

### gtk_color_selection_get_has_opacity_control ()

    gboolean    gtk_color_selection_get_has_opacity_control
                                                (GtkColorSelection *colorsel);

Determines whether the colorsel has an opacity control.

`colorsel` : | a GtkColorSelection.
Returns : | `TRUE` if the `colorsel` has an opacity control. `FALSE` if it does't.

### gtk_color_selection_set_has_palette ()

    void        gtk_color_selection_set_has_palette
                                                (GtkColorSelection *colorsel,
                                                 gboolean has_palette);

Shows and hides the palette based upon the value of `has_palette`.

`colorsel` : | a GtkColorSelection.
`has_palette` : | `TRUE` if palette is to be visible, `FALSE` otherwise.

### gtk_color_selection_get_has_palette ()

    gboolean    gtk_color_selection_get_has_palette
                                                (GtkColorSelection *colorsel);

Determines whether the color selector has a color palette.

`colorsel` : | a GtkColorSelection.
Returns : | `TRUE` if the selector has a palette. `FALSE` if it hasn't.

### gtk_color_selection_get_current_alpha ()

    guint16     gtk_color_selection_get_current_alpha
                                                (GtkColorSelection *colorsel);

Returns the maximum number of palette colors.

`colorsel` : | a GtkColorSelection.
Returns : | the maximum number of palette indexes.

### gtk_color_selection_set_current_alpha ()

    void        gtk_color_selection_set_current_alpha
                                                (GtkColorSelection *colorsel,
                                                 guint16 alpha);

Sets the current opacity to be `alpha`. The first time this is called, it will also set the original opacity to be `alpha` too.

`colorsel` : | a GtkColorSelection.
`alpha` : | an integer between 0 and 65535.

### gtk_color_selection_get_current_color ()

    void        gtk_color_selection_get_current_color
                                                (GtkColorSelection *colorsel,
                                                 GdkColor *color);

Sets `color` to be the current color in the GtkColorSelection widget.

`colorsel` : | a GtkColorSelection.
`color` : | a GdkColor to fill in with the current color.

### gtk_color_selection_set_current_color ()

    void        gtk_color_selection_set_current_color
                                                (GtkColorSelection *colorsel,
                                                 GdkColor *color);

Sets the current color to be `color`. The first time this is called, it will also set the original color to be `color` too.

`colorsel` : | a GtkColorSelection.
`color` : | A GdkColor to set the current color with.

### gtk_color_selection_get_previous_alpha ()

    guint16     gtk_color_selection_get_previous_alpha
                                                (GtkColorSelection *colorsel);

Returns the previous alpha value.

`colorsel` : | a GtkColorSelection.
Returns : | an integer between 0 and 65535.

### gtk_color_selection_set_previous_alpha ()

    void        gtk_color_selection_set_previous_alpha
                                                (GtkColorSelection *colorsel,
                                                 guint16 alpha);

Sets the 'previous' alpha to be `alpha`. This function should be called with some hesitations, as it might seem confusing to have that alpha change.

`colorsel` : | a GtkColorSelection.
`alpha` : | an integer between 0 and 65535.

### gtk_color_selection_get_previous_color ()

    void        gtk_color_selection_get_previous_color
                                                (GtkColorSelection *colorsel,
                                                 GdkColor *color);

Fills `color` in with the original color value.

`colorsel` : | a GtkColorSelection.
`color` : | a GdkColor to fill in with the original color value.

### gtk_color_selection_set_previous_color ()

    void        gtk_color_selection_set_previous_color
                                                (GtkColorSelection *colorsel,
                                                 GdkColor *color);

Sets the 'previous' color to be `color`. This function should be called with some hesitations, as it might seem confusing to have that color change. Calling gtk_color_selection_set_current_color() will also set this color the first time it is called.

`colorsel` : | a GtkColorSelection.
`color` : | a GdkColor to set the previous color with.

### gtk_color_selection_is_adjusting ()

    gboolean    gtk_color_selection_is_adjusting
                                                (GtkColorSelection *colorsel);

Gets the current state of the `colorsel`.

`colorsel` : | a GtkColorSelection.
Returns : | `TRUE` if the user is currently dragging a color around, and `FALSE` if the selection has stopped.

### gtk_color_selection_palette_from_string ()

    gboolean    gtk_color_selection_palette_from_string
                                                (const gchar *str,
                                                 GdkColor **colors,
                                                 gint *n_colors);

Parses a color palette string; the string is a colon-separated list of color names readable by gdk_color_parse().

`str` : | a string encoding a color palette.
`colors` : | return location for allocated array of GdkColor.
`n_colors` : | return location for length of array.
Returns : | `TRUE` if a palette was successfully parsed.

### gtk_color_selection_palette_to_string ()

    gchar*      gtk_color_selection_palette_to_string
                                                (const GdkColor *colors,
                                                 gint n_colors);

Encodes a palette as a string, useful for persistent storage.

`colors` : | an array of colors.
`n_colors` : | length of the array.
Returns : | allocated string encoding the palette.

### gtk_color_selection_set_change_palette_hook ()

    GtkColorSelectionChangePaletteFunc gtk_color_selection_set_change_palette_hook
                                                (GtkColorSelectionChangePaletteFunc func);

Installs a global function to be called whenever the user tries to modify the palette in a color selection. This function should save the new palette contents, and update the GtkSettings property "gtk-color-palette" so all GtkColorSelection widgets will be modified.

`func` : | a function to call when the custom palette needs saving.
Returns : | the previous change palette hook (that was replaced).

### GtkColorSelectionChangePaletteFunc ()

    void        (*GtkColorSelectionChangePaletteFunc)
                                                (const GdkColor *colors,
                                                 gint n_colors);

`colors` : |
`n_colors` : |

### gtk_color_selection_set_change_palette_with_screen_hook ()

    GtkColorSelectionChangePaletteWithScreenFunc gtk_color_selection_set_change_palette_with_screen_hook
                                                (GtkColorSelectionChangePaletteWithScreenFunc func);

`func` : |
Returns : |

### GtkColorSelectionChangePaletteWithScreenFunc ()

    void        (*GtkColorSelectionChangePaletteWithScreenFunc)
                                                (GdkScreen *screen,
                                                 const GdkColor *colors,
                                                 gint n_colors);

`screen` : |
`colors` : |
`n_colors` : |

### gtk_color_selection_set_color ()

    void        gtk_color_selection_set_color   (GtkColorSelection *colorsel,
                                                 gdouble *color);

Warning
`gtk_color_selection_set_color` is deprecated and should not be used in newly-written code.

Sets the current color to be `color`. The first time this is called, it will also set the original color to be `color` too.

This function is deprecated, use gtk_color_selection_set_current_color() instead.

`colorsel` : | a GtkColorSelection.
`color` : | an array of 4 doubles specifying the red, green, blue and opacity to set the current color to.

### gtk_color_selection_get_color ()

    void        gtk_color_selection_get_color   (GtkColorSelection *colorsel,
                                                 gdouble *color);

Warning
`gtk_color_selection_get_color` is deprecated and should not be used in newly-written code.

Sets `color` to be the current color in the GtkColorSelection widget.

This function is deprecated, use gtk_color_selection_get_current_color() instead.

`colorsel` : | a GtkColorSelection.
`color` : | an array of 4 gdouble to fill in with the current color.

## Properties

"`has-palette`" (gboolean : Read / Write)

  Whether a palette should be used

"`has-opacity-control`" (gboolean : Read / Write)

  Whether the color selector should allow setting opacity

"`current-color`" (GdkColor : Read / Write)

  The current color

"`current-alpha`" (guint : Read / Write)

  The current opacity value (0 fully transparent, 65535 fully opaque)

## Signals

### The "color-changed" signal

    void        user_function                  (GtkColorSelection *colorselection,
                                                gpointer user_data);

This signal is emitted when the color changes in the GtkColorSelection according to its update policy.

`colorselection` : | the object which received the signal.
`user_data` : | user data set when the signal handler was connected.

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