GtkEventController: GTK+ 3 Reference Manual

## GtkEventController GtkEventController — Self-contained handler of series of events |

## Functions

GtkPropagationPhase | gtk_event_controller_get_propagation_phase ()
void | gtk_event_controller_set_propagation_phase ()
gboolean | gtk_event_controller_handle_event ()
GtkWidget * | gtk_event_controller_get_widget ()
void | gtk_event_controller_reset ()

## Properties

GtkPropagationPhase | propagation-phase | Read / Write
GtkWidget * | widget | Read / Write / Construct Only

## Types and Values

| GtkEventController
enum | GtkPropagationPhase

## Object Hierarchy

        GObject
        ╰── GtkEventController
            ├── GtkEventControllerKey
            ├── GtkEventControllerMotion
            ├── GtkEventControllerScroll
            ├── GtkGesture
            ╰── GtkPadController

## Includes

    #include <gtk/gtkunixprint.h>

## Description

GtkEventController is a base, low-level implementation for event controllers. Those react to a series of GdkEvents, and possibly trigger actions as a consequence of those.

## Functions

### gtk_event_controller_get_propagation_phase ()

    GtkPropagationPhase
    gtk_event_controller_get_propagation_phase
                                   (GtkEventController *controller);

Gets the propagation phase at which `controller` handles events.

#### Parameters

controller | a GtkEventController |

#### Returns

the propagation phase

Since: 3.14

### gtk_event_controller_set_propagation_phase ()

    void
    gtk_event_controller_set_propagation_phase
                                   (GtkEventController *controller,
                                    GtkPropagationPhase phase);

Sets the propagation phase at which a controller handles events.

If `phase` is `GTK_PHASE_NONE`, no automatic event handling will be performed, but other additional gesture maintenance will. In that phase, the events can be managed by calling `gtk_event_controller_handle_event()`.

#### Parameters

controller | a GtkEventController |
phase | a propagation phase |

Since: 3.14

### gtk_event_controller_handle_event ()

    gboolean
    gtk_event_controller_handle_event (GtkEventController *controller,
                                       const GdkEvent *event);

Feeds an events into `controller` , so it can be interpreted and the controller actions triggered.

#### Parameters

controller | a GtkEventController |
event | a GdkEvent |

#### Returns

`TRUE` if the event was potentially useful to trigger the controller action

Since: 3.14

### gtk_event_controller_get_widget ()

    GtkWidget *
    gtk_event_controller_get_widget (GtkEventController *controller);

Returns the GtkWidget this controller relates to.

#### Parameters

controller | a GtkEventController |

#### Returns

a GtkWidget.

[transfer none]

Since: 3.14

### gtk_event_controller_reset ()

    void
    gtk_event_controller_reset (GtkEventController *controller);

Resets the `controller` to a clean state. Every interaction the controller did through “handle-event” will be dropped at this point.

#### Parameters

controller | a GtkEventController |

Since: 3.14

## Types and Values

### GtkEventController

    typedef struct _GtkEventController GtkEventController;

### enum GtkPropagationPhase

Describes the stage at which events are fed into a GtkEventController.

#### Members

GTK_PHASE_NONE | Events are not delivered automatically. Those can be manually fed through `gtk_event_controller_handle_event()`. This should only be used when full control about when, or whether the controller handles the event is needed. |
GTK_PHASE_CAPTURE | Events are delivered in the capture phase. The capture phase happens before the bubble phase, runs from the toplevel down to the event widget. This option should only be used on containers that might possibly handle events before their children do. |
GTK_PHASE_BUBBLE | Events are delivered in the bubble phase. The bubble phase happens after the capture phase, and before the default handlers are run. This phase runs from the event widget, up to the toplevel. |
GTK_PHASE_TARGET | Events are delivered in the default widget event handlers, note that widget implementations must chain up on button, motion, touch and grab broken handlers for controllers in this phase to be run. |

Since: 3.14

## Property Details

### The `“propagation-phase”` property

      “propagation-phase”        GtkPropagationPhase

The propagation phase at which this controller will handle events.

Flags: Read / Write

Default value: GTK_PHASE_BUBBLE

Since: 3.14

### The `“widget”` property

      “widget”                   GtkWidget *

The widget receiving the GdkEvents that the controller will handle.

Flags: Read / Write / Construct Only

Since: 3.14

## See Also

GtkGesture