ZoomLayout
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latest: v0.7.1 GitHub

This page describes all the APIs related to pan. These are common to all Zoom classes in the library, and also to the low level engine.

APIs

All pan APIs accept x and y coordinates. These refer to the top-left visible pixel of the content.

  • If using ZoomLayout, the coordinate system is that of the inner view
  • If using ZoomImageView, the coordinate system is that of the drawable intrinsic width and height
  • If using ZoomSurfaceView, the coordinate system is that of the view dimensions
  • If using the engine directly, the coordinate system is that of the rect starting at (0f, 0f) and having the size you passed in setContentSize

In any case the current scale is not considered, so your system won’t change if zoom changes.

API Description Default value
getPan() Returns the current pan as a point. -
getPanX() Returns the current horizontal pan. -
getPanY() Returns the current vertical pan. -
getScaledPan() Returns the current scaled pan as a point (pan * realZoom). -
getScaledPanX() Returns the current scaled horizontal pan (panX * realZoom). -
getScaledPanY() Returns the current scaled vertical pan (panY * realZoom). -
setOverScrollHorizontal(boolean) If true, the content will be allowed to pan outside its horizontal bounds, then return to its position. true
setOverScrollVertical(boolean) If true, the content will be allowed to pan outside its vertical bounds, then return to its position. true
setHorizontalPanEnabled(boolean) If true, the content will be allowed to pan horizontally by user input. true
setVerticalPanEnabled(boolean) If true, the content will be allowed to pan vertically by user input. true
setFlingEnabled(boolean) If true, fling gestures will be detected. true
setScrollEnabled(boolean) If true, scroll gestures will be detected. true
setOneFingerScrollEnabled(boolean) If true, one finger scroll gestures will be detected. true
setTwoFingersScrollEnabled(boolean) If true, two fingers scroll gestures will be detected. true
setThreeFingersScrollEnabled(boolean) If true, three fingers scroll gestures will be detected. true
setAllowFlingInOverscroll(boolean) If true, fling gestures will be allowed even when detected while overscrolled. This might cause artifacts so it is disabled by default. false
panTo(float, float, boolean) Pans to the given values, animating if needed. -
panBy(float, float, boolean) Applies the given deltas to the current pan, animating if needed. -
cancelAnimations() Cancels all currently active animations triggered by either API calls with animate = true or touch input flings. -

The moveTo(float, float, float, boolean) API will let you animate both zoom and pan at the same time.

Note: To pan the content of a ZoomLayout to the right you must move it to the left - so depending on the situtation you might need to pass in negative coordinates to panTo or moveTo for the desired outcome.