Add motion event forwarding hidden APIs to View (6fb3b9eb) · Commits · e / os / android_frameworks_base

core/java/android/view/View.java

+84 −0

Original line number	Diff line number	Diff line
		@@ -15425,6 +15425,90 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		return parent;
		}

		/**
		* Transforms a motion event from view-local coordinates to on-screen
		* coordinates.
		*
		* @param ev the view-local motion event
		* @return false if the transformation could not be applied
		* @hide
		*/
		public boolean toGlobalMotionEvent(MotionEvent ev) {
		final AttachInfo info = mAttachInfo;
		if (info == null) {
		return false;
		}

		transformMotionEventToGlobal(ev);
		ev.offsetLocation(info.mWindowLeft, info.mWindowTop);
		return true;
		}

		/**
		* Transforms a motion event from on-screen coordinates to view-local
		* coordinates.
		*
		* @param ev the on-screen motion event
		* @return false if the transformation could not be applied
		* @hide
		*/
		public boolean toLocalMotionEvent(MotionEvent ev) {
		final AttachInfo info = mAttachInfo;
		if (info == null) {
		return false;
		}

		ev.offsetLocation(-info.mWindowLeft, -info.mWindowTop);
		transformMotionEventToLocal(ev);
		return true;
		}

		/**
		* Recursive helper method that applies transformations in post-order.
		*
		* @param ev the on-screen motion event
		*/
		private void transformMotionEventToLocal(MotionEvent ev) {
		final ViewParent parent = mParent;
		if (parent instanceof View) {
		final View vp = (View) parent;
		vp.transformMotionEventToLocal(ev);
		ev.offsetLocation(vp.mScrollX, vp.mScrollY);
		} else if (parent instanceof ViewRootImpl) {
		final ViewRootImpl vr = (ViewRootImpl) parent;
		ev.offsetLocation(0, vr.mCurScrollY);
		}

		ev.offsetLocation(-mLeft, -mTop);

		if (!hasIdentityMatrix()) {
		ev.transform(getInverseMatrix());
		}
		}

		/**
		* Recursive helper method that applies transformations in pre-order.
		*
		* @param ev the on-screen motion event
		*/
		private void transformMotionEventToGlobal(MotionEvent ev) {
		if (!hasIdentityMatrix()) {
		ev.transform(getMatrix());
		}

		ev.offsetLocation(mLeft, mTop);

		final ViewParent parent = mParent;
		if (parent instanceof View) {
		final View vp = (View) parent;
		ev.offsetLocation(-vp.mScrollX, -vp.mScrollY);
		vp.transformMotionEventToGlobal(ev);
		} else if (parent instanceof ViewRootImpl) {
		final ViewRootImpl vr = (ViewRootImpl) parent;
		ev.offsetLocation(0, -vr.mCurScrollY);
		}
		}

		/**
		* <p>Computes the coordinates of this view on the screen. The argument
		* must be an array of two integers. After the method returns, the array