## ColorComboBox

ColorComboBox — Defines a specialised GtkComboBox to choose stored colours.

## Synopsis

    #include <coreTools/toolColor.h>

                        ColorComboBox;
    GtkWidget*          colorComboBox_new                   (gboolean hasAlphaChannel);
    GtkWidget*          colorComboBox_newWithRanges         (gboolean hasAlphaChannel);
    GdkPixbuf*          colorComboBoxBuild_colorStamp       (Color *color,
                                                             gboolean alpha);
    GdkPixbuf*          colorComboBoxGet_selectedPixbuf     (ColorComboBox *colorComboBox);
    Color*              colorComboBoxGet_selectedColor      (ColorComboBox *colorComboBox);
    GdkPixbuf*          colorComboBoxGet_pixbufFromColor    (ColorComboBox *colorComboBox,
                                                             Color *color);
    float*              colorComboBoxGet_material           (ColorComboBox *colorComboBox);
    float*              colorComboBoxGet_color              (ColorComboBox *colorComboBox);
    GtkWidget*          colorComboBoxGet_rangesWidgets      (ColorComboBox *colorComboBox);
    gboolean            colorComboBoxSet_selectionByColor   (ColorComboBox *colorComboBox,
                                                             Color *color);
    void                colorComboBoxSet_expanded           (ColorComboBox *colorComboBox,
                                                             gboolean value);
    void                colorComboBoxSet_color              (ColorComboBox *colorComboBox,
                                                             float rgba[4],
                                                             gboolean raiseSignal);
    void                colorComboBoxSet_material           (ColorComboBox *colorComboBox,
                                                             float material[nb_material],
                                                             gboolean raiseSignal);
    void                colorComboBoxSet_printValues        (ColorComboBox *colorComboBox,
                                                             gboolean value);

## Description

This widget looks like a GtkComboBox and it displays a list of stored colours. These colours may come from the configuration files or can be selected and stored by the user actions. To do it, the first entry of the combo box is 'new / modify', that opens a GTK colour picker. The new values are used to craete a new colour entry in the combo box. In a complete version, the combo box can have a GtkVBox associated to modify colours without creating new entries, see `colorComboBox_newWithRanges()` method. Otherwise, only already selected colours are available. The stored colours are shared by all widgets of this class. It is thus a convenient way to have coherent colour picker through V_Sim.

When the widget is created with ranges, the additional part can be retrieve with `colorComboBoxGet_rangesWidgets()` and attached whereever is convenient. When the ranges are modified, the new colour is not added to the combo box. It can be read using `colorComboBoxGet_color()` or `colorComboBoxGet_material()`. The combo box is set thus to an unselected state and `colorComboBoxGet_selectedColor()` will return a NULL pointer. Besides the colour ranges, there is an add button to insert the newly defined colour into the combo box.

This widget can emit a "color-selected" signal that is a wrapper around the "changed" signal, but it is emitted only when a new colour is selected (either an existing one or a newly created from the picker). This colour is passed to the callback. The two other signals, "color-value-changed" and "material-value-changed", are generated when the widget have been created with ranges and that one of these ranges is modified.

## Details

### ColorComboBox

    typedef struct _ColorComboBox ColorComboBox;

Private structure to store informations of a ColorComboBox object.

Since 3.1

### colorComboBox_new ()

    GtkWidget*          colorComboBox_new                   (gboolean hasAlphaChannel);

A ColorComboBox widget is like a GtkComboBox widget, but it is already filled with the colors stores in the structures adhoc in visu_tools.h. Using this widget is a convienient way to share colors between all part of V_Sim and to give a consistent look of all color selection. If the argument `hasAlphaChannel` is FALSE, the widget display all colors but without their alpha channel, assuming it to be fully opaque.

`hasAlphaChannel` : | a boolean.
Returns : | a newly created ColorComboBox widget.

Since 3.1

### colorComboBox_newWithRanges ()

    GtkWidget*          colorComboBox_newWithRanges         (gboolean hasAlphaChannel);

Create a color combo and several ranges.

`hasAlphaChannel` : | a boolean.
Returns : | a newly created ColorComboBox widget.

Since 3.3

### colorComboBoxBuild_colorStamp ()

    GdkPixbuf*          colorComboBoxBuild_colorStamp       (Color *color,
                                                             gboolean alpha);

This method is used by ColorComboBox object to create little stamps representing the color. If the pixbuf of such stamps are needed, use `colorComboBoxGet_pixbufFromColor()` if the color is registered in an already existing ColorComboBox object or use this method to create a new stamp.

`color` : | a Color object ;
`alpha` : | a boolean.
Returns : | a pixbuf pointer corresponding to the little image as shown on a `colorComboBox` (use `g_object_unref()` to free this pixbuf).

Since 3.1

### colorComboBoxGet_selectedPixbuf ()

    GdkPixbuf*          colorComboBoxGet_selectedPixbuf     (ColorComboBox *colorComboBox);

The `colorComboBox` has little pixbufs to represent the color. User methods can use these pixbufs but should considered them read-only.

`colorComboBox` : | a ColorComboBox widget.
Returns : | a pixbuf pointer corresponding to the little image shown on the `colorComboBox`.

Since 3.1

### colorComboBoxGet_selectedColor ()

    Color*              colorComboBoxGet_selectedColor      (ColorComboBox *colorComboBox);

The user can access to the selected Color object using this method.

`colorComboBox` : | a ColorComboBox widget.
Returns : | a pointer to the selected Color object (or NULL). This object is read-only.

Since 3.1

### colorComboBoxGet_pixbufFromColor ()

    GdkPixbuf*          colorComboBoxGet_pixbufFromColor    (ColorComboBox *colorComboBox,
                                                             Color *color);

The `colorComboBox` has little pixbufs to represent the color. User methods can use these pixbufs but should considered them read-only.

`colorComboBox` : | a ColorComboBox widget ;
`color` : | a Color object.
Returns : | a pixbuf pointer corresponding to the little image shown on the `colorComboBox`.

Since 3.1

### colorComboBoxGet_material ()

    float*              colorComboBoxGet_material           (ColorComboBox *colorComboBox);

If the `colorComboBox` uses ranges (see `colorComboBox_newWithRanges()`), this method is used to get the values from the material ranges.

`colorComboBox` : | a ColorComboBox widget.
Returns : | a newly created array of size nb_material (see Material). Use `g_free()` to delete it.

Since 3.3

### colorComboBoxGet_color ()

    float*              colorComboBoxGet_color              (ColorComboBox *colorComboBox);

If the `colorComboBox` uses ranges (see `colorComboBox_newWithRanges()`), this method is used to get the values from the color ranges.

`colorComboBox` : | a ColorComboBox widget.
Returns : | a newly created array of size 4. Use `g_free()` to delete it.

Since 3.2

### colorComboBoxGet_rangesWidgets ()

    GtkWidget*          colorComboBoxGet_rangesWidgets      (ColorComboBox *colorComboBox);

Retrieve the wiodget using to represent the ranges, or NULL if the object has no ranges.

`colorComboBox` : | a Color object.
Returns : | a widget owned by `color`.

Since 3.3

### colorComboBoxSet_selectionByColor ()

    gboolean            colorComboBoxSet_selectionByColor   (ColorComboBox *colorComboBox,
                                                             Color *color);

Use this method to set the ComboBox on the given color. This emits a 'color-channel' signal if the color is changed, which means, a previous color has been modified, or a new color is selected.

`colorComboBox` : | a ColorComboBox widget ;
`color` : | a Color object.
Returns : | TRUE if the `color` already exists in the model.

Since 3.1

### colorComboBoxSet_expanded ()

    void                colorComboBoxSet_expanded           (ColorComboBox *colorComboBox,
                                                             gboolean value);

Set the expanded state of the ranges. This is usable only if the colorComboBox has been created with ranges.

`colorComboBox` : | a Color object ;
`value` : | a boolean value.

Since 3.3

### colorComboBoxSet_color ()

    void                colorComboBoxSet_color              (ColorComboBox *colorComboBox,
                                                             float rgba[4],
                                                             gboolean raiseSignal);

Change the values for the ranges that control the color. If the color exists in the list, it is also selected. This is possible only if the `colorComboBox` has been created with `colorComboBox_newWithRanges()`.

`colorComboBox` : | a ColorComboBox widget ;
`rgba` : | 4 floating point values ;
`raiseSignal` : | if TRUE a material-value-changed can be raised.

Since 3.3

### colorComboBoxSet_material ()

    void                colorComboBoxSet_material           (ColorComboBox *colorComboBox,
                                                             float material[nb_material],
                                                             gboolean raiseSignal);

Change the values for the ranges that control the light (emission, diffuse...). This is possible only if the `colorComboBox` has been created with `colorComboBox_newWithRanges()`.

`colorComboBox` : | a ColorComboBox widget ;
`material` : | nb_material (see Material) floating point values ;
`raiseSignal` : | if TRUE a material-value-changed can be raised.

Since 3.3

### colorComboBoxSet_printValues ()

    void                colorComboBoxSet_printValues        (ColorComboBox *colorComboBox,
                                                             gboolean value);

Print or not the RGB values.

`colorComboBox` : | a Color object ;
`value` : | a boolean.

Since 3.4

## See Also

Color, StippleComboBox, ShadeComboBox