Delete joystick scroll/zoom support.

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 489eb245759485ec628cb3a4616010d65ae15a99..0000000000000000000000000000000000000000
--- a/content/public/android/java/src/org/chromium/content/browser/input/JoystickZoomProvider.java
+++ /dev/null
@@ -1,131 +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 org.chromium.content.browser.ContentViewCore;
-
-/**
- * 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;
-
-    private long mLastAnimateTimeMillis;
-
-    private float mZoomInVelocity;
-
-    private float mZoomOutVelocity;
-
-    protected final ContentViewCore mContentViewCore;
-
-    protected float mDeviceScaleFactor;
-
-    private int mZoomXcoord;
-
-    private int mZoomYcoord;
-
-    protected Runnable mZoomRunnable;
-
-    private AnimationIntervalProvider mSystemAnimationIntervalProvider;
-
-    /**
-     * Constructs a new JoystickZoomProvider.
-     *
-     * @param cvc The ContentViewCore used to create this.
-     */
-    public JoystickZoomProvider(
-            ContentViewCore cvc, AnimationIntervalProvider animationTimeProvider) {
-        mContentViewCore = cvc;
-        mDeviceScaleFactor = mContentViewCore.getRenderCoordinates().getDeviceScaleFactor();
-        mZoomXcoord = mContentViewCore.getViewportWidthPix() / 2;
-        mZoomYcoord = mContentViewCore.getViewportHeightPix() / 2;
-        mSystemAnimationIntervalProvider = animationTimeProvider;
-    }
-
-    /**
-     * 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();
-            mContentViewCore.getContainerView().postOnAnimation(mZoomRunnable);
-            mContentViewCore.pinchBegin(mZoomXcoord, mZoomYcoord);
-        }
-        return true;
-    }
-
-    protected void stop() {
-        if (mLastAnimateTimeMillis != 0) {
-            mContentViewCore.pinchEnd();
-            mLastAnimateTimeMillis = 0;
-        }
-    }
-
-    private void computeNewZoomVelocity(MotionEvent event) {
-        mZoomInVelocity = getFilteredAxisValue(event, MotionEvent.AXIS_RTRIGGER);
-        mZoomOutVelocity = getFilteredAxisValue(event, MotionEvent.AXIS_LTRIGGER);
-    }
-
-    protected void animateZoom() {
-        if (!mContentViewCore.getContainerView().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);
-        mContentViewCore.pinchBy(mZoomXcoord, mZoomYcoord, zoomFactor);
-        mLastAnimateTimeMillis = timeMillis;
-        mContentViewCore.getContainerView().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 float getFilteredAxisValue(MotionEvent event, int axis) {
-        float axisValWithNoise = event.getAxisValue(axis);
-        return (axisValWithNoise > JOYSTICK_NOISE_THRESHOLD) ? axisValWithNoise : 0f;
-    }
-}