CtkGestureZoom

CtkGestureZoom — Zoom gesture

Functions

CtkGesture * ctk_gesture_zoom_new ()
gdouble ctk_gesture_zoom_get_scale_delta ()

Signals

void scale-changed Run First

Types and Values

  CtkGestureZoom

Object Hierarchy

    GObject
    ╰── CtkEventController
        ╰── CtkGesture
            ╰── CtkGestureZoom

Includes

#include <ctk/ctk.h>

Description

CtkGestureZoom is a CtkGesture implementation able to recognize pinch/zoom gestures, whenever the distance between both tracked sequences changes, the “scale-changed” signal is emitted to report the scale factor.

Functions

ctk_gesture_zoom_new ()

CtkGesture *
ctk_gesture_zoom_new (CtkWidget *widget);

Returns a newly created CtkGesture that recognizes zoom in/out gestures (usually known as pinch/zoom).

Parameters

widget

a CtkWidget

  

Returns

a newly created CtkGestureZoom

Since: 3.14

ctk_gesture_zoom_get_scale_delta ()

gdouble
ctk_gesture_zoom_get_scale_delta (CtkGestureZoom *gesture);

If gesture is active, this function returns the zooming difference since the gesture was recognized (hence the starting point is considered 1:1). If gesture is not active, 1 is returned.

Parameters

gesture

a CtkGestureZoom

  

Returns

the scale delta

Since: 3.14

Types and Values

CtkGestureZoom

typedef struct _CtkGestureZoom CtkGestureZoom;

Signal Details

The “scale-changed” signal

void
user_function (CtkGestureZoom *controller,
               double          scale,
               gpointer        user_data)

This signal is emitted whenever the distance between both tracked sequences changes.

Parameters

controller

the object on which the signal is emitted

  

scale

Scale delta, taking the initial state as 1:1

  

user_data

user data set when the signal handler was connected.

  

Flags: Run First

Since: 3.14

See Also

CtkGestureRotate

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