GestureZoom

#GtkGestureZoom is a #GtkGesture implementation able to recognize pinch/zoom gestures, whenever the distance between both tracked sequences changes, the #GtkGestureZoom::scale-changed signal is emitted to report the scale factor.

class GestureZoom : Gesture {

protected

GtkGestureZoom* gtkGestureZoom;

GtkGestureZoom* getGestureZoomStruct(bool transferOwnership);

void* getStruct();

this(GtkGestureZoom* gtkGestureZoom, bool ownedRef);

static GType getType();

this(Widget widget);

double getScaleDelta();

gulong addOnScaleChanged(void delegate(double, GestureZoom) dlg, ConnectFlags connectFlags);

}

Constructors

this this(GtkGestureZoom* gtkGestureZoom, bool ownedRef): Sets our main struct and passes it to the parent class.
this this(Widget widget): Returns a newly created #GtkGesture that recognizes zoom in/out gestures (usually known as pinch/zoom).

Members

Functions

addOnScaleChanged gulong addOnScaleChanged(void delegate(double, GestureZoom) dlg, ConnectFlags connectFlags): This signal is emitted whenever the distance between both tracked sequences changes.
getGestureZoomStruct GtkGestureZoom* getGestureZoomStruct(bool transferOwnership): Get the main Gtk struct
getScaleDelta double getScaleDelta(): 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.
getStruct void* getStruct(): the main Gtk struct as a void*

Static functions

getType GType getType()

Variables

gtkGestureZoom GtkGestureZoom* gtkGestureZoom;: the main Gtk struct

Inherited Members

From Gesture

gtkGesture GtkGesture* gtkGesture;: the main Gtk struct
getGestureStruct GtkGesture* getGestureStruct(bool transferOwnership): Get the main Gtk struct
getStruct void* getStruct(): the main Gtk struct as a void*
getType GType getType()
getBoundingBox bool getBoundingBox(GdkRectangle rect): If there are touch sequences being currently handled by @gesture, this function returns %TRUE and fills in @rect with the bounding box containing all active touches. Otherwise, %FALSE will be returned.
getBoundingBoxCenter bool getBoundingBoxCenter(double x, double y): If there are touch sequences being currently handled by @gesture, this function returns %TRUE and fills in @x and @y with the center of the bounding box containing all active touches. Otherwise, %FALSE will be returned.
getDevice Device getDevice(): Returns the master #GdkDevice that is currently operating on @gesture, or %NULL if the gesture is not being interacted.
getGroup ListG getGroup(): Returns all gestures in the group of @gesture
getLastEvent Event getLastEvent(GdkEventSequence* sequence): Returns the last event that was processed for @sequence.
getLastUpdatedSequence GdkEventSequence* getLastUpdatedSequence(): Returns the #GdkEventSequence that was last updated on @gesture.
getPoint bool getPoint(GdkEventSequence* sequence, double x, double y): If @sequence is currently being interpreted by @gesture, this function returns %TRUE and fills in @x and @y with the last coordinates stored for that event sequence. The coordinates are always relative to the widget allocation.
getSequenceState GtkEventSequenceState getSequenceState(GdkEventSequence* sequence): Returns the @sequence state, as seen by @gesture.
getSequences ListG getSequences(): Returns the list of #GdkEventSequences currently being interpreted by @gesture.
getWindow Window getWindow(): Returns the user-defined window that receives the events handled by @gesture. See gtk_gesture_set_window() for more information.
group void group(Gesture gesture): Adds @gesture to the same group than @group_gesture. Gestures are by default isolated in their own groups.
handlesSequence bool handlesSequence(GdkEventSequence* sequence): Returns %TRUE if @gesture is currently handling events corresponding to @sequence.
isActive bool isActive(): Returns %TRUE if the gesture is currently active. A gesture is active meanwhile there are touch sequences interacting with it.
isGroupedWith bool isGroupedWith(Gesture other): Returns %TRUE if both gestures pertain to the same group.
isRecognized bool isRecognized(): Returns %TRUE if the gesture is currently recognized. A gesture is recognized if there are as many interacting touch sequences as required by @gesture, and #GtkGesture::check returned %TRUE for the sequences being currently interpreted.
setSequenceState bool setSequenceState(GdkEventSequence* sequence, GtkEventSequenceState state): Sets the state of @sequence in @gesture. Sequences start in state #GTK_EVENT_SEQUENCE_NONE, and whenever they change state, they can never go back to that state. Likewise, sequences in state #GTK_EVENT_SEQUENCE_DENIED cannot turn back to a not denied state. With these rules, the lifetime of an event sequence is constrained to the next four:
setState bool setState(GtkEventSequenceState state): Sets the state of all sequences that @gesture is currently interacting with. See gtk_gesture_set_sequence_state() for more details on sequence states.
setWindow void setWindow(Window window): Sets a specific window to receive events about, so @gesture will effectively handle only events targeting @window, or a child of it. @window must pertain to gtk_event_controller_get_widget().
ungroup void ungroup(): Separates @gesture into an isolated group.
addOnBegin gulong addOnBegin(void delegate(GdkEventSequence*, Gesture) dlg, ConnectFlags connectFlags): This signal is emitted when the gesture is recognized. This means the number of touch sequences matches #GtkGesture:n-points, and the #GtkGesture::check handler(s) returned #TRUE.
addOnBegin gulong addOnBegin(void delegate(Event, Gesture) dlg, ConnectFlags connectFlags): This signal is emitted when the gesture is recognized. This means the number of touch sequences matches #GtkGesture:n-points, and the #GtkGesture::check handler(s) returned #TRUE.
addOnCancel gulong addOnCancel(void delegate(GdkEventSequence*, Gesture) dlg, ConnectFlags connectFlags): This signal is emitted whenever a sequence is cancelled. This usually happens on active touches when gtk_event_controller_reset() is called on @gesture (manually, due to grabs...), or the individual @sequence was claimed by parent widgets' controllers (see gtk_gesture_set_sequence_state()).
addOnCancel gulong addOnCancel(void delegate(Event, Gesture) dlg, ConnectFlags connectFlags): This signal is emitted whenever a sequence is cancelled. This usually happens on active touches when gtk_event_controller_reset() is called on @gesture (manually, due to grabs...), or the individual @sequence was claimed by parent widgets' controllers (see gtk_gesture_set_sequence_state()).
addOnEnd gulong addOnEnd(void delegate(GdkEventSequence*, Gesture) dlg, ConnectFlags connectFlags): This signal is emitted when @gesture either stopped recognizing the event sequences as something to be handled (the #GtkGesture::check handler returned %FALSE), or the number of touch sequences became higher or lower than #GtkGesture:n-points.
addOnEnd gulong addOnEnd(void delegate(Event, Gesture) dlg, ConnectFlags connectFlags): This signal is emitted when @gesture either stopped recognizing the event sequences as something to be handled (the #GtkGesture::check handler returned %FALSE), or the number of touch sequences became higher or lower than #GtkGesture:n-points.
addOnSequenceStateChanged gulong addOnSequenceStateChanged(void delegate(GdkEventSequence*, GtkEventSequenceState, Gesture) dlg, ConnectFlags connectFlags): This signal is emitted whenever a sequence state changes. See gtk_gesture_set_sequence_state() to know more about the expectable sequence lifetimes.
addOnSequenceStateChanged gulong addOnSequenceStateChanged(void delegate(Event, GtkEventSequenceState, Gesture) dlg, ConnectFlags connectFlags): This signal is emitted whenever a sequence state changes. See gtk_gesture_set_sequence_state() to know more about the expectable sequence lifetimes.
addOnUpdate gulong addOnUpdate(void delegate(GdkEventSequence*, Gesture) dlg, ConnectFlags connectFlags): This signal is emitted whenever an event is handled while the gesture is recognized. @sequence is guaranteed to pertain to the set of active touches.
addOnUpdate gulong addOnUpdate(void delegate(Event, Gesture) dlg, ConnectFlags connectFlags): This signal is emitted whenever an event is handled while the gesture is recognized. @sequence is guaranteed to pertain to the set of active touches.