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65 lines
3.4 KiB
65 lines
3.4 KiB
---
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layout: page
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title: "Gestures"
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description: "Gestures control"
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order: 5
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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.AUTO_FOCUS); // Tap to focus!
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cameraView.mapGesture(Gesture.LONG_TAP, GestureAction.TAKE_PICTURE); // 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` `EXPOSURE_CORRECTION` `FILTER_CONTROL_1` `FILTER_CONTROL_2` `NONE`|
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|`TAP`|Single tap gesture, typically assigned to the focus control.|`AUTO_FOCUS` `TAKE_PICTURE` `TAKE_PICTURE_SNAPSHOT` `NONE`|
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|`LONG_TAP`|Long tap gesture.|`AUTO_FOCUS` `TAKE_PICTURE` `TAKE_PICTURE_SNAPSHOT` `NONE`|
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|`SCROLL_HORIZONTAL`|Horizontal movement gesture.|`ZOOM` `EXPOSURE_CORRECTION` `FILTER_CONTROL_1` `FILTER_CONTROL_2` `NONE`|
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|`SCROLL_VERTICAL`|Vertical movement gesture.|`ZOOM` `EXPOSURE_CORRECTION` `FILTER_CONTROL_1` `FILTER_CONTROL_2` `NONE`|
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### Gesture Actions
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Looking at this from the other side:
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|Gesture action|Description|Can be mapped to|
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|--------------|-----------|----------------|
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|`NONE`|Disables this gesture.|`TAP` `LONG_TAP` `PINCH` `SCROLL_HORIZONTAL` `SCROLL_VERTICAL`|
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|`AUTO_FOCUS`|Launches a [touch metering operation](metering#touch-metering) on the finger position.|`TAP` `LONG_TAP`|
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|`TAKE_PICTURE`|Takes a picture using [takePicture](capturing-media).|`TAP` `LONG_TAP`|
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|`TAKE_PICTURE_SNAPSHOT`|Takes a picture using [takePictureSnapshot](capturing-media).|`TAP` `LONG_TAP`|
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|`ZOOM`|[Zooms](controls#zoom) in or out.|`PINCH` `SCROLL_HORIZONTAL` `SCROLL_VERTICAL`|
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|`EXPOSURE_CORRECTION`|Controls the [exposure correction](metering#exposure-correction).|`PINCH` `SCROLL_HORIZONTAL` `SCROLL_VERTICAL`|
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|`FILTER_CONTROL_1`|Controls the first parameter (if any) of a [real-time filter](filters).|`PINCH` `SCROLL_HORIZONTAL` `SCROLL_VERTICAL`|
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|`FILTER_CONTROL_2`|Controls the second parameter (if any) of a [real-time filter](filters).|`PINCH` `SCROLL_HORIZONTAL` `SCROLL_VERTICAL`|
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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|filterControl1|filterControl2|none"
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app:cameraGestureTap="autoFocus|takePicture|takePictureSnapshot|none"
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app:cameraGestureLongTap="autoFocus|takePicture|takePictureSnapshot|none"
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app:cameraGestureScrollHorizontal="zoom|exposureCorrection|filterControl1|filterControl2|none"
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app:cameraGestureScrollVertical="zoom|exposureCorrection|filterControl1|filterControl2|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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