GestureZoomProtocol

public protocol GestureZoomProtocol : GestureProtocol

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.

The GestureZoomProtocol protocol exposes the methods and properties of an underlying GtkGestureZoom instance. The default implementation of these can be found in the protocol extension below. For a concrete class that implements these methods and properties, see GestureZoom. Alternatively, use GestureZoomRef as a lighweight, unowned reference if you already have an instance you just want to use.

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  • ptr

    Untyped pointer to the underlying GtkGestureZoom instance.

    Declaration

    Swift

    var ptr: UnsafeMutableRawPointer! { get }
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  • gesture_zoom_ptr Default implementation

    Typed pointer to the underlying GtkGestureZoom instance.

    Default Implementation

    Return the stored, untyped pointer as a typed pointer to the GtkGestureZoom instance.

    Declaration

    Swift

    var gesture_zoom_ptr: UnsafeMutablePointer<GtkGestureZoom>! { get }
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  • Required Initialiser for types conforming to GestureZoomProtocol

    Declaration

    Swift

    init(raw: UnsafeMutableRawPointer)
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GestureZoom Class

  • Bind a GestureZoomPropertyName source property to a given target object.

    Declaration

    Swift

    @discardableResult
@inlinable
func bind<Q, T>(property source_property: GestureZoomPropertyName, to target: T, _ target_property: Q, flags f: BindingFlags = .default, transformFrom transform_from: @escaping GLibObject.ValueTransformer = { $0.transform(destValue: $1) }, transformTo transform_to: @escaping GLibObject.ValueTransformer = { $0.transform(destValue: $1) }) -> BindingRef! where Q : PropertyNameProtocol, T : ObjectProtocol

    Parameters

    source_property

    the source property to bind
    target

    the target object to bind to
    target_property

    the target property to bind to
    flags

    the flags to pass to the Binding
    transform_from

    ValueTransformer to use for forward transformation
    transform_to

    ValueTransformer to use for backwards transformation

    Return Value

    binding reference or nil in case of an error

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  • get(property:) Extension method

    Get the value of a GestureZoom property

    Declaration

    Swift

    @inlinable
func get(property: GestureZoomPropertyName) -> GLibObject.Value

    Parameters

    property

    the property to get the value for

    Return Value

    the value of the named property

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  • set(property:value:) Extension method

    Set the value of a GestureZoom property. Note that this will only have an effect on properties that are writable and not construct-only!

    Declaration

    Swift

    @inlinable
func set(property: GestureZoomPropertyName, value v: GLibObject.Value)

    Parameters

    property

    the property to get the value for

    Return Value

    the value of the named property

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GestureZoom signals

  • Connect a Swift signal handler to the given, typed GestureZoomSignalName signal

    Declaration

    Swift

    @discardableResult
@inlinable
func connect(signal s: GestureZoomSignalName, flags f: ConnectFlags = ConnectFlags(0), handler h: @escaping SignalHandler) -> Int

    Parameters

    signal

    The signal to connect
    flags

    The connection flags to use
    data

    A pointer to user data to provide to the callback
    destroyData

    A GClosureNotify C function to destroy the data pointed to by userData
    handler

    The Swift signal handler (function or callback) to invoke on the given signal

    Return Value

    The signal handler ID (always greater than 0 for successful connections)

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  • Connect a C signal handler to the given, typed GestureZoomSignalName signal

    Declaration

    Swift

    @discardableResult
@inlinable
func connect(signal s: GestureZoomSignalName, flags f: ConnectFlags = ConnectFlags(0), data userData: gpointer!, destroyData destructor: GClosureNotify? = nil, signalHandler h: @escaping GCallback) -> Int

    Parameters

    signal

    The signal to connect
    flags

    The connection flags to use
    data

    A pointer to user data to provide to the callback
    destroyData

    A GClosureNotify C function to destroy the data pointed to by userData
    signalHandler

    The C function to be called on the given signal

    Return Value

    The signal handler ID (always greater than 0 for successful connections)

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

    Note

    This represents the underlying scale-changed signal

    Declaration

    Swift

    @discardableResult
@inlinable
func onScaleChanged(flags: ConnectFlags = ConnectFlags(0), handler: @escaping (_ unownedSelf: GestureZoomRef, _ scale: Double) -> Void) -> Int

    Parameters

    flags

    Flags
    unownedSelf

    Reference to instance of self
    scale

    Scale delta, taking the initial state as 1:1
    handler

    The signal handler to call Run the given callback whenever the scaleChanged signal is emitted
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  • scaleChangedSignal Extension method

    Typed scale-changed signal for using the connect(signal:) methods

    Declaration

    Swift

    static var scaleChangedSignal: GestureZoomSignalName { get }
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GestureZoom Class: GestureZoomProtocol extension (methods and fields)

  • getScaleDelta() Extension method

    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.

    Declaration

    Swift

    @inlinable
func getScaleDelta() -> Double
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  • scaleDelta Extension method

    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.

    Declaration

    Swift

    @inlinable
var scaleDelta: Double { get }
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