class: DragSurface

[12:7] extends: object

A surface that is used during DND.

Members

• handleObj
• lib
• retainedCallbacks
• signalHandlerNames
• signalSetterHandlers

Methods

• DragSurface (Handle = null)

  Creates a new DragSurface by wrapping a native handle or another wrapper.

  • @p Handle is the native handle or another wrapper whose handle to adopt.

• 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.

• 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.

• setOnComputesize (callback Fn, UserData = null)

  Emitted when the size for the surface needs to be computed, when it is present. This signal will normally be emitted during the native surface layout cycle when the surface size needs to be recomputed. It is the responsibility of the drag surface user to handle this signal and compute the desired size of the surface, storing the computed size in the [struct@Gdk.DragSurfaceSize] object that is passed to the signal handler, using [method@Gdk.DragSurfaceSize.set_size]. Failing to set a size so will result in an arbitrary size being used as a result.

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

• present (int width, int height)

  Present @drag_surface.

  • @p width is the unconstrained drag_surface width to layout.
  • @p height is the unconstrained drag_surface height to layout.

class: DragSurfaceMeta

[234:14] static extends: object

Generated metadata helpers for DragSurface interface surfaces.

Methods

• signals ()

  Returns signal metadata for DragSurface.

  • @r A list.

class: DragSurfaceComputesizeCallback

[163:7] extends: object

Generated low-level callback wrapper for GIR callback compute-size.

Members

• callbackObj
• userFn
• userData
• hasUserData

Methods

• DragSurfaceComputesizeCallback (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, size, 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.