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Commit c4ce0da2 authored by Adam Powell's avatar Adam Powell
Browse files

DO NOT MERGE - Delay starting scale gesture events until a touch slop threshold 

Change-Id: I13132ce1d912b54e251f7afed5143c72a2ec2e78
parent 1eca514a

core/java/android/view/ScaleGestureDetector.java

+16 −8
Original line number Diff line number Diff line
@@ -86,8 +86,8 @@ public class ScaleGestureDetector { 
         * pointers going up.

         *

         * Once a scale has ended, {@link ScaleGestureDetector#getFocusX()}

         * and {@link ScaleGestureDetector#getFocusY()} will return the location

         * of the pointer remaining on the screen.

         * and {@link ScaleGestureDetector#getFocusY()} will return focal point

         * of the pointers remaining on the screen.

         *

         * @param detector The detector reporting the event - use this to

         *          retrieve extended info about event state.
@@ -128,6 +128,7 @@ public class ScaleGestureDetector { 


    private float mCurrSpan;

    private float mPrevSpan;

    private float mInitialSpan;

    private float mCurrSpanX;

    private float mCurrSpanY;

    private float mPrevSpanX;
@@ -135,6 +136,7 @@ public class ScaleGestureDetector { 
    private long mCurrTime;

    private long mPrevTime;

    private boolean mInProgress;

    private int mSpanSlop;



    /**

     * Consistency verifier for debugging purposes.
@@ -146,6 +148,7 @@ public class ScaleGestureDetector { 
    public ScaleGestureDetector(Context context, OnScaleGestureListener listener) {

        mContext = context;

        mListener = listener;

        mSpanSlop = ViewConfiguration.get(context).getScaledTouchSlop() * 2;

    }



    /**
@@ -176,6 +179,7 @@ public class ScaleGestureDetector { 
            if (mInProgress) {

                mListener.onScaleEnd(this);

                mInProgress = false;

                mInitialSpan = 0;

            }



            if (streamComplete) {
@@ -221,18 +225,24 @@ public class ScaleGestureDetector { 
        // Dispatch begin/end events as needed.

        // If the configuration changes, notify the app to reset its current state by beginning

        // a fresh scale event stream.

        final boolean wasInProgress = mInProgress;

        mFocusX = focusX;

        mFocusY = focusY;

        if (mInProgress && (span == 0 || configChanged)) {

            mListener.onScaleEnd(this);

            mInProgress = false;

            mInitialSpan = span;

        }

        if (configChanged) {

            mPrevSpanX = mCurrSpanX = spanX;

            mPrevSpanY = mCurrSpanY = spanY;

            mPrevSpan = mCurrSpan = span;

            mInitialSpan = mPrevSpan = mCurrSpan = span;

        }

        if (!mInProgress && span != 0) {

            mFocusX = focusX;

            mFocusY = focusY;

        if (!mInProgress && span != 0 &&

                (wasInProgress || Math.abs(span - mInitialSpan) > mSpanSlop)) {

            mPrevSpanX = mCurrSpanX = spanX;

            mPrevSpanY = mCurrSpanY = spanY;

            mPrevSpan = mCurrSpan = span;

            mInProgress = mListener.onScaleBegin(this);

        }
@@ -241,8 +251,6 @@ public class ScaleGestureDetector { 
            mCurrSpanX = spanX;

            mCurrSpanY = spanY;

            mCurrSpan = span;

            mFocusX = focusX;

            mFocusY = focusY;



            boolean updatePrev = true;

            if (mInProgress) {