class: GestureZoomScalechangedCallback

[159:7] extends: object

Generated low-level callback wrapper for GIR callback scale-changed.

Members

• callbackObj
• userFn
• userData
• hasUserData

Methods

• GestureZoomScalechangedCallback (callback Fn, UserData = null)

  Creates one native callback wrapper. The wrapper owns a trampoline that converts native pointers into generated wrapper objects before invoking Fn.

  • @p Fn is the Aussom callback implementation.
  • @p UserData is retained and passed through to Fn on each invocation when provided.

• trampoline (nativeSelf, scale, nativeUserData)

  Internal trampoline. Converts native pointer arguments into generated wrapper instances, then invokes the user's callback.

• callback ()

  Returns the wrapped NativeCallback.

• handle ()

  Returns the callback as a NativeHandle.

• close ()

  Closes the underlying NativeCallback.

• isClosed ()

  Returns true when the callback has been closed.

class: GestureZoom

[14:7] extends: object

Recognizes 2-finger pinch/zoom gestures. Whenever the distance between both tracked sequences changes, the [signal@Gtk.GestureZoom::scale-changed] signal is emitted to report the scale factor.

Members

• handleObj
• lib
• retainedCallbacks
• signalHandlerNames
• signalSetterHandlers

Methods

• GestureZoom ()

  Returns a newly created GtkGesture that recognizes pinch/zoom gestures.

• toNativeHandle (Source)

  Normalizes a constructor argument into a raw pointer carrier. Accepts a raw NativeHandle, a raw NativeBuffer returned from fn.call(...), another generated wrapper exposing handle(), or null. Returns null when the argument carries no pointer.

  • @p Source is the raw handle, raw buffer, wrapper, or null.
  • @r A raw pointer carrier or null when no pointer is present.

• getLib ()

  Returns the opened native library for this generated wrapper.

  • @r The opened native library.

• handle ()

  Returns the wrapped NativeHandle.

  • @r The wrapped NativeHandle.

• isNull ()

  Returns true when the wrapped handle is null.

  • @r A bool.

• describe ()

  Returns a small string for debugging generated wrappers.

  • @r A string.

• asGesture ()

  Wraps this handle as Gesture.

  • @r A Gesture object.

• connectSignal (string Name, CallbackObj)

  Connects one generated callback wrapper to a named signal.

  • @p Name is the signal name.
  • @p CallbackObj is the generated callback wrapper to connect.
  • @r The connected handler id.

• disconnectSignalHandler (int HandlerId)

  Disconnects one retained signal handler id.

  • @p HandlerId is the signal handler id to disconnect.
  • @r None.

• setOnScalechanged (callback Fn, UserData = null)

  Emitted whenever the distance between both tracked sequences changes.

  • @p Fn is the Aussom callback.
  • @p Fn is called with (GestureZoom Self, double Scale).
  • @p UserData is retained and passed through to the generated callback wrapper when provided.
  • @r The connected handler id.

• get_scale_delta ()

  Gets the scale delta. 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.

class: GestureZoomMeta

[229:14] static extends: object

Generated metadata helpers for GestureZoom class surfaces.

Methods

• signals ()

  Returns signal metadata for GestureZoom.

  • @r A list.