GimpChainButton: GIMP Widgets Library Reference Manual

## GimpChainButton GimpChainButton — Widget to visually connect two entry widgets. |

## Functions

GtkWidget * | gimp_chain_button_new ()
void | gimp_chain_button_set_active ()
gboolean | gimp_chain_button_get_active ()

## Properties

GimpChainPosition | position | Read / Write / Construct Only

## Signals

void | toggled | Run First

## Types and Values

| GimpChainButton
enum | GimpChainPosition

## Object Hierarchy

        GObject
        ╰── GInitiallyUnowned
            ╰── GtkObject
                ╰── GtkWidget
                    ╰── GtkContainer
                        ╰── GtkTable
                            ╰── GimpChainButton

## Implemented Interfaces

GimpChainButton implements AtkImplementorIface and GtkBuildable.

## Description

This widget provides a button showing either a linked or a broken chain that can be used to link two entries, spinbuttons, colors or other GUI elements and show that they may be locked. Use it for example to connect X and Y ratios to provide the possibility of a constrained aspect ratio.

The GimpChainButton only gives visual feedback, it does not really connect widgets. You have to take care of locking the values yourself by checking the state of the GimpChainButton whenever a value changes in one of the connected widgets and adjusting the other value if necessary.

## Functions

### gimp_chain_button_new ()

    GtkWidget *
    gimp_chain_button_new (GimpChainPosition position);

Creates a new GimpChainButton widget.

This returns a button showing either a broken or a linked chain and small clamps attached to both sides that visually group the two widgets you want to connect. This widget looks best when attached to a table taking up two columns (or rows respectively) next to the widgets that it is supposed to connect. It may work for more than two widgets, but the look is optimized for two.

#### Parameters

position | The position you are going to use for the button with respect to the widgets you want to chain. |

#### Returns

Pointer to the new GimpChainButton, which is inactive by default. Use `gimp_chain_button_set_active()` to change its state.

### gimp_chain_button_set_active ()

    void
    gimp_chain_button_set_active (GimpChainButton *button,
                                  gboolean active);

Sets the state of the GimpChainButton to be either locked (`TRUE`) or unlocked (`FALSE`) and changes the showed pixmap to reflect the new state.

#### Parameters

button | Pointer to a GimpChainButton. |
active | The new state. |

### gimp_chain_button_get_active ()

    gboolean
    gimp_chain_button_get_active (GimpChainButton *button);

Checks the state of the GimpChainButton.

#### Parameters

button | Pointer to a GimpChainButton. |

#### Returns

`TRUE` if the GimpChainButton is active (locked).

## Types and Values

### GimpChainButton

    typedef struct _GimpChainButton GimpChainButton;

### enum GimpChainPosition

Possible chain positions for GimpChainButton.

#### Members

GIMP_CHAIN_TOP | the chain is on top |
GIMP_CHAIN_LEFT | the chain is to the left |
GIMP_CHAIN_BOTTOM | the chain is on bottom |
GIMP_CHAIN_RIGHT | the chain is to the right |

## Property Details

### The `“position”` property

      “position”                 GimpChainPosition

The position in which the chain button will be used.

Flags: Read / Write / Construct Only

Default value: GIMP_CHAIN_TOP

Since: GIMP 2.4

## Signal Details

### The `“toggled”` signal

    void
    user_function (GimpChainButton *gimpchainbutton,
                   gpointer         user_data)

Flags: Run First

## See Also

You may want to use the convenience function `gimp_coordinates_new()` to set up two GimpSizeEntries (see GimpSizeEntry) linked with a GimpChainButton.