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52 lines
2.1 KiB
52 lines
2.1 KiB
---
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layout: page
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title: "Gestures"
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subtitle: "Gestures control"
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category: docs
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order: 4
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date: 2018-12-20 20:49:35
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disqus: 1
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---
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`CameraView` listen to lots of different gestures inside its bounds. You have the chance to map
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these gestures to particular actions or camera controls, using the `mapGesture()` method.
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This lets you emulate typical behaviors in a single line:
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```java
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cameraView.mapGesture(Gesture.PINCH, GestureAction.ZOOM); // Pinch to zoom!
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cameraView.mapGesture(Gesture.TAP, GestureAction.FOCUS_WITH_MARKER); // Tap to focus!
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cameraView.mapGesture(Gesture.LONG_TAP, GestureAction.CAPTURE); // Long tap to shoot!
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```
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Simple as that. There are two things to be noted:
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- Not every mapping is valid. For example, you can't control zoom with long taps, or start focusing by pinching.
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- Some actions might not be supported by the sensor. Check out `CameraOptions` to know what's legit and what's not.
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|Gesture|Description|Can be mapped to|
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|-------------|-----------|----------------|
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|`PINCH`|Pinch gesture, typically assigned to the zoom control.|`zoom` `exposureCorrection` `none`|
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|`TAP`|Single tap gesture, typically assigned to the focus control.|`focus` `focusWithMarker` `capture` `none`|
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|`LONG_TAP`|Long tap gesture.|`focus` `focusWithMarker` `capture` `none`|
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|`SCROLL_HORIZONTAL`|Horizontal movement gesture.|`zoom` `exposureCorrection` `none`|
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|`SCROLL_VERTICAL`|Vertical movement gesture.|`zoom` `exposureCorrection` `none`|
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### XML Attributes
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```xml
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<com.otaliastudios.cameraview.CameraView
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app:cameraGesturePinch="zoom|exposureCorrection|none"
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app:cameraGestureTap="focus|focusWithMarker|capture|none"
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app:cameraGestureLongTap="focus|focusWithMarker|capture|none"
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app:cameraGestureScrollHorizontal="zoom|exposureCorrection|none"
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app:cameraGestureScrollVertical="zoom|exposureCorrection|none"/>
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```
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### Related APIs
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|Method|Description|
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|------|-----------|
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|`mapGesture(Gesture, GestureAction)`|Maps a certain gesture to a certain action. No-op if the action is not supported.|
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|`getGestureAction(Gesture)`|Returns the action currently mapped to the given gesture.|
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|`clearGesture(Gesture)`|Clears any action mapped to the given gesture.|
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