GestureRecognizer class (Windows)

0 out of 13 rated this helpful - Rate this topic

Provides gesture and manipulation recognition, event listeners, and settings.

Syntax


public ref class GestureRecognizer sealed : Object

Attributes

ActivatableAttribute(NTDDI_WIN8)
MarshalingBehaviorAttribute(None)
VersionAttribute(NTDDI_WIN8)

Members

The GestureRecognizer class has these types of members:

Constructors
Events
Methods
Properties

Constructors

The GestureRecognizer class has these constructors.

Constructor	Description
GestureRecognizer	Initializes a new instance of a GestureRecognizer object.

Events

The GestureRecognizer class has these events.

Event	Description
CrossSliding	Occurs when a user performs a slide or swipe gesture (through a single touch contact) within a content area that supports panning along a single axis only. The gesture must occur in a direction that is perpendicular to this panning axis.
Dragging	Occurs when a user performs a slide or swipe gesture with a mouse or pen/stylus (single contact).
Holding	Occurs when a user performs a press and hold gesture (with a single touch, mouse, or pen/stylus contact).
ManipulationCompleted	Occurs when the input points are lifted and all subsequent motion (translation, expansion, or rotation) through inertia has ended.
ManipulationInertiaStarting	Occurs when all contact points are lifted during a manipulation and the velocity of the manipulation is significant enough to initiate inertia behavior (translation, expansion, or rotation continue after the input pointers are lifted).
ManipulationStarted	Occurs when one or more input points have been initiated and subsequent motion (translation, expansion, or rotation) has begun.
ManipulationUpdated	Occurs after one or more input points have been initiated and subsequent motion (translation, expansion, or rotation) is under way.
RightTapped	Occurs when the pointer input is interpreted as a right-tap gesture.
Tapped	Occurs when the pointer input is interpreted as a tap gesture.

Methods

The GestureRecognizer class has these methods. With C#, Visual Basic, and C++, it also inherits methods from the Object class.

Method	Description
CanBeDoubleTap	Identifies whether a tap can still be interpreted as the second tap of a double tap gesture.
CompleteGesture	Causes the gesture recognizer to finalize an interaction.
ProcessDownEvent	Processes pointer input and raises the GestureRecognizer events appropriate to a pointer down action for the gestures and manipulations specified by the GestureSettings property.
ProcessInertia	Performs inertia calculations and raises the various inertia events.
ProcessMouseWheelEvent	Processes pointer input and raises the GestureRecognizer events appropriate to a mouse wheel action for the gestures and manipulations specified by the GestureSettings property.
ProcessMoveEvents	Processes pointer input and raises the GestureRecognizer events appropriate to a pointer move action for the gestures and manipulations specified by the GestureSettings property.
ProcessUpEvent	Processes pointer input and raises the GestureRecognizer events appropriate to a pointer up action for the gestures and manipulations specified by the GestureSettings property.

Properties

The GestureRecognizer class has these properties.

Property	Access type	Description
AutoProcessInertia	Read/write	Gets or sets a value that indicates whether manipulations during inertia are generated automatically.
CrossSlideExact	Read/write	Gets or sets a value that indicates whether the exact distance from initial contact to end of the cross-slide interaction is reported.By default, a small distance threshold is subtracted from the first position reported by the system for a cross-slide interaction. If this flag is set, the distance threshold is not subtracted from the initial position.
CrossSlideHorizontally	Read/write	Gets or sets a value that indicates whether the cross-slide axis is horizontal.
CrossSlideThresholds	Read/write	Gets or sets values that indicate the distance thresholds for a CrossSliding interaction.
GestureSettings	Read/write	Gets or sets a value that indicates the gesture and manipulation settings supported by an application.
InertiaExpansion	Read/write	Gets or sets a value that indicates the relative change in size of an object from the start of inertia to the end of inertia (when resizing, or scaling, is complete).
InertiaExpansionDeceleration	Read/write	Gets or sets a value that indicates the rate of deceleration from the start of inertia to the end of inertia (when the resizing, or expansion, manipulation is complete).
InertiaRotationAngle	Read/write	Gets or sets a value that indicates the final angle of rotation of an object at the end of inertia (when the rotation manipulation is complete).
InertiaRotationDeceleration	Read/write	Gets or sets a value that indicates the rate of deceleration from the start of inertia to the end of inertia (when the rotation manipulation is complete).
InertiaTranslationDeceleration	Read/write	Gets or sets a value that indicates the rate of deceleration from the start of inertia to the end of inertia (when the translation manipulation is complete).
InertiaTranslationDisplacement	Read/write	Gets or sets a value that indicates the relative change in the screen location of an object from the start of inertia to the end of inertia (when the translation manipulation is complete).
IsActive	Read-only	Gets a value that indicates whether an interaction is being processed.
IsInertial	Read-only	Gets a value that indicates whether a manipulation is still being processed during inertia (no input points are active).
ManipulationExact	Read/write	Gets or sets a value that indicates whether the exact distance from initial contact to end of the interaction is reported.By default, a small distance threshold is subtracted from the first delta reported by the system. This distance threshold is intended to account for slight movements of the contact when processing a tap gesture. If this flag is set, the distance threshold is not subtracted from the first delta.
MouseWheelParameters	Read-only	Gets a set of properties that are associated with the wheel button of a mouse device.
PivotCenter	Read/write	Gets or sets the center point for a rotation interaction when single pointer input is detected.
PivotRadius	Read/write	Gets or sets the radius, from the PivotCenter to the pointer input, for a rotation interaction when single pointer input is detected.
ShowGestureFeedback	Read/write	Gets or sets a value that indicates whether visual feedback is displayed during an interaction.

Remarks

We recommend the following techniques for handling GestureRecognizer events:

Use the target or currentTarget property of the event object instead of the GestureRecognizer object in the event handler:

The following pseudocode shows how you might set up a generic event handler for a GestureRecognizer object.


function initialize() 
{
  myGestureRecognizer = new Windows.UI.Input.GestureRecognizer();

  myGestureRecognizer.addEventListener('someevent', that.someeventhandler);
}

function someeventhandler = function (ev) {
    ev.target.somemethod();
}

Set the event handler to null if it is no longer needed:
Copy
myGestureRecognizer.someeventhandler = null;

For more information on how to listen to and handle Windows Runtime events, see Using the Windows Runtime in JavaScript.

Note : This class is not agile, which means that you need to consider its threading model and marshaling behavior. For more info, see Threading and Marshaling (C++/CX) and Using Windows Runtime objects in a multithreaded environment (.NET).

Windows Phone 8

This API is not implemented and will throw an exception if called.

Examples

The following example demonstrates how to create a GestureRecognizer object and then enable manipulation and gesture events on that object through the GestureSettings property.

JavaScript


// Initialize gesture recognizer
        gr = new Windows.UI.Input.GestureRecognizer();

        // Configure GestureRecognizer to detect rotation, translation, and scaling,
        // inertia, and tap gesture
        gr.gestureSettings =
            Windows.UI.Input.GestureSettings.manipulationRotate |
            Windows.UI.Input.GestureSettings.manipulationTranslateX |
            Windows.UI.Input.GestureSettings.manipulationTranslateY |
            Windows.UI.Input.GestureSettings.manipulationScale |
            Windows.UI.Input.GestureSettings.manipulationRotateInertia |
            Windows.UI.Input.GestureSettings.manipulationScaleInertia |
            Windows.UI.Input.GestureSettings.manipulationTranslateInertia |
            Windows.UI.Input.GestureSettings.tap;

Requirements

Minimum supported client	Windows 8 [Windows Store apps only]
Minimum supported server	Windows Server 2012 [Windows Store apps only]
Minimum supported phone	Windows Phone 8
Namespace	Windows.UI.Input Windows::UI::Input [C++]
Metadata	Windows.winmd

GestureRecognizer class