PinchArea QML Type
Enables simple pinch gesture handling More...
| Import Statement: | import QtQuick 2.7 |
| Inherits: |
Properties
- enabled : bool
- pinch
- pinch.target : Item
- pinch.active : bool
- pinch.minimumScale : real
- pinch.maximumScale : real
- pinch.minimumRotation : real
- pinch.maximumRotation : real
- pinch.dragAxis : enumeration
- pinch.minimumX : real
- pinch.maximumX : real
- pinch.minimumY : real
- pinch.maximumY : real
Signals
Detailed Description
The PinchArea type was added in QtQuick 1.1
A PinchArea is an invisible item that is typically used in conjunction with a visible item in order to provide pinch gesture handling for that item.
The enabled property is used to enable and disable pinch handling for the proxied item. When disabled, the pinch area becomes transparent to mouse/touch events.
PinchArea can be used in two ways:
- setting a
pinch.targetto provide automatic interaction with an item - using the onPinchStarted, onPinchUpdated and onPinchFinished handlers
Since Qt 5.5, PinchArea can react to native pinch gesture events from the operating system if available; otherwise it reacts only to touch events.
See also PinchEvent, QNativeGestureEvent, and QTouchEvent.
Property Documentation
This property holds whether the item accepts pinch gestures.
This property defaults to true.
pinch.target : Item |
pinch provides a convenient way to make an item react to pinch gestures.
pinch.targetspecifies the id of the item to drag.pinch.activespecifies if the target item is currently being dragged.pinch.minimumScaleandpinch.maximumScalelimit the range of the Item.scale property, but not thePinchEventscale property.pinch.minimumRotationandpinch.maximumRotationlimit the range of the Item.rotation property, but not thePinchEventrotation property.pinch.dragAxisspecifies whether dragging in not allowed (Pinch.NoDrag), can be done horizontally (Pinch.XAxis), vertically (Pinch.YAxis), or both (Pinch.XAndYAxis)pinch.minimumandpinch.maximumlimit how far the target can be dragged along the corresponding axes.
Signal Documentation
This signal is emitted when the pinch area detects that a pinch gesture has started: two touch points (fingers) have been detected, and they have moved beyond the startDragDistance threshold for the gesture to begin.
The pinch parameter (not the same as the pinch property) provides information about the pinch gesture, including the scale, center and angle of the pinch. At the time of the pinchStarted signal, these values are reset to the default values, regardless of the results from previous gestures: pinch.scale will be 1.0 and pinch.rotation will be 0.0. As the gesture progresses, pinchUpdated will report the deviation from those defaults.
To ignore this gesture set the pinch.accepted property to false. The gesture will be canceled and no further events will be sent.
The corresponding handler is onPinchStarted.
This signal is emitted when the pinch area detects that a pinch gesture has changed.
The pinch parameter provides information about the pinch gesture, including the scale, center and angle of the pinch. These values reflect changes only since the beginning of the current gesture, and therefore are not limited by the minimum and maximum limits in the pinch property.
The corresponding handler is onPinchUpdated.
This signal is emitted when the pinch area detects the smart zoom gesture. This gesture occurs only on certain operating systems such as macOS.
The pinch parameter provides information about the pinch gesture, including the location where the gesture occurred. pinch.scale will be greater than zero when the gesture indicates that the user wishes to enter smart zoom, and zero when exiting (even though typically the same gesture is used to toggle between the two states).
The corresponding handler is onSmartZoom.
This QML signal was introduced in Qt 5.5.