Delete Android joystick zoom code.

content/public/android/java/src/org/chromium/content/browser/input/JoystickZoomProvider.java

Index: content/public/android/java/src/org/chromium/content/browser/input/JoystickZoomProvider.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/input/JoystickZoomProvider.java b/content/public/android/java/src/org/chromium/content/browser/input/JoystickZoomProvider.java
deleted file mode 100644
index 4e5608a09d56b359045818481b136004e29bca96..0000000000000000000000000000000000000000
--- a/content/public/android/java/src/org/chromium/content/browser/input/JoystickZoomProvider.java
+++ /dev/null
@@ -1,190 +0,0 @@
-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package org.chromium.content.browser.input;
-
-import android.view.InputDevice;
-import android.view.MotionEvent;
-import android.view.View;
-import android.view.animation.AnimationUtils;
-
-import org.chromium.base.VisibleForTesting;
-
-/**
- * This class controls page zoomin/out using trigger joystick events.
- * Page Zoomin is proportional to RTRIGGER axis movement.
- * Page Zoomout is proportional to LTRIGGER axis movement.
- */
-public class JoystickZoomProvider {
-    private static final String TAG = "JoystickZoomProvider";
-
-    private static final float JOYSTICK_NOISE_THRESHOLD = 0.2f;
-
-    private static final float ZOOM_SPEED = 1.65f;
-
-    /**
-     * Interface that provides the implementation of pinch zoom action.
-     */
-    public interface PinchZoomHandler {
-        /**
-         * Send start of pinch zoom gesture.
-         *
-         * @param xPix X-coordinate of location from which pinch zoom would start.
-         * @param yPix Y-coordinate of location from which pinch zoom would start.
-         * @return whether the pinch zoom start gesture was sent.
-         */
-        boolean pinchBegin(int xPix, int yPix);
-
-        /**
-         * Send pinch zoom gesture.
-         *
-         * @param xPix X-coordinate of pinch zoom location.
-         * @param yPix Y-coordinate of pinch zoom location.
-         * @param delta the factor by which the current page scale should be multiplied by.
-         * @return whether the pinchby gesture was sent.
-         */
-        boolean pinchBy(int xPix, int yPix, float delta);
-
-        /**
-         * Stop pinch zoom gesture.
-         *
-         * @return whether the pinch stop gesture was sent.
-         */
-        boolean pinchEnd();
-    }
-    ;
-
-    /**
-     * Interface that provides last animation interval. Overriden for testing.
-     */
-    public interface AnimationIntervalProvider {
-        /**
-         * Returns last animation interval.
-         */
-        public long getLastAnimationFrameInterval();
-    }
-    ;
-
-    protected final float mDeviceScaleFactor;
-    protected View mContainerView;
-    protected Runnable mZoomRunnable;
-
-    private final int mZoomXcoord;
-    private final int mZoomYcoord;
-    private final PinchZoomHandler mPinchZoomHandler;
-
-    private AnimationIntervalProvider mSystemAnimationIntervalProvider;
-    private long mLastAnimateTimeMillis;
-    private float mZoomInVelocity;
-    private float mZoomOutVelocity;
-
-    /**
-     * Constructs a new JoystickZoomProvider.
-     *
-     * @param containerView The view to which the zoom action will be posted.
-     * @param scaleFactor Device scale factor.
-     * @param xcoord X position of the zoom point.
-     * @param ycoord Y position of the zoom point.
-     * @param pinchZoomHandler {@link PinchZoomHandler} implementation.
-     */
-    public JoystickZoomProvider(View containerView, float scaleFactor, int xcoord, int ycoord,
-            PinchZoomHandler pinchZoomHandler) {
-        mContainerView = containerView;
-        mDeviceScaleFactor = scaleFactor;
-        mZoomXcoord = xcoord;
-        mZoomYcoord = ycoord;
-        mPinchZoomHandler = pinchZoomHandler;
-        mSystemAnimationIntervalProvider = new AnimationIntervalProvider() {
-            @Override
-            public long getLastAnimationFrameInterval() {
-                return AnimationUtils.currentAnimationTimeMillis();
-            }
-        };
-    }
-
-    @VisibleForTesting
-    public void setAnimationIntervalProviderForTesting(AnimationIntervalProvider intervalProvider) {
-        mSystemAnimationIntervalProvider = intervalProvider;
-    }
-
-    public void setContainerView(View containerView) {
-        mContainerView = containerView;
-    }
-
-    /**
-     * This function processes motion event and computes new
-     * page scale factor which is proportional to *_TRIGGER axes movement.
-     * It also starts runnable to update current page scale to new page scale.
-     *
-     * @param event Motion event to be processed for zooming.
-     * @return Whether zooming using *_TRIGGER axes is performed or not.
-     */
-    public boolean onMotion(MotionEvent event) {
-        if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) == 0) return false;
-
-        computeNewZoomVelocity(event);
-        if (mZoomInVelocity == 0 && mZoomOutVelocity == 0) {
-            stop();
-            return false;
-        }
-        if (mZoomRunnable == null) {
-            mZoomRunnable = new Runnable() {
-                @Override
-                public void run() {
-                    animateZoom();
-                }
-            };
-        }
-        if (mLastAnimateTimeMillis == 0) {
-            mLastAnimateTimeMillis =
-                    mSystemAnimationIntervalProvider.getLastAnimationFrameInterval();
-            mContainerView.postOnAnimation(mZoomRunnable);
-            mPinchZoomHandler.pinchBegin(mZoomXcoord, mZoomYcoord);
-        }
-        return true;
-    }
-
-    protected void stop() {
-        if (mLastAnimateTimeMillis != 0) {
-            mPinchZoomHandler.pinchEnd();
-            mLastAnimateTimeMillis = 0;
-        }
-    }
-
-    private void computeNewZoomVelocity(MotionEvent event) {
-        mZoomInVelocity = getFilteredAxisValue(event, MotionEvent.AXIS_RTRIGGER);
-        mZoomOutVelocity = getFilteredAxisValue(event, MotionEvent.AXIS_LTRIGGER);
-    }
-
-    protected void animateZoom() {
-        if (!mContainerView.hasFocus()) {
-            stop();
-            return;
-        }
-        if (mLastAnimateTimeMillis == 0) return;
-
-        final long timeMillis = mSystemAnimationIntervalProvider.getLastAnimationFrameInterval();
-        final long dt = timeMillis - mLastAnimateTimeMillis;
-        final float zoomFactor = (float) Math.pow(
-                ZOOM_SPEED, mDeviceScaleFactor * (mZoomInVelocity - mZoomOutVelocity) * dt / 1000f);
-        mPinchZoomHandler.pinchBy(mZoomXcoord, mZoomYcoord, zoomFactor);
-        mLastAnimateTimeMillis = timeMillis;
-        mContainerView.postOnAnimation(mZoomRunnable);
-    }
-
-    /**
-     * This function removes noise from motion events.
-     * Joystick is very senstitive, it produces value (noise) along X/Y directions
-     * even if gamepad button is pressed which is not acceptable.
-     * Returns non-zero value only if event value is above noise threshold.
-     *
-     * @param event Motion event which needs noise processing.
-     * @param axis Joystick axis (whether X_AXIS of Y_AXIS)
-     * @return Processed joystick value.
-     */
-    private static float getFilteredAxisValue(MotionEvent event, int axis) {
-        float axisValWithNoise = event.getAxisValue(axis);
-        return (axisValWithNoise > JOYSTICK_NOISE_THRESHOLD) ? axisValWithNoise : 0f;
-    }
-}