Delete joystick scroll/zoom support.

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

Index: content/public/android/java/src/org/chromium/content/browser/input/JoystickScrollProvider.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/input/JoystickScrollProvider.java b/content/public/android/java/src/org/chromium/content/browser/input/JoystickScrollProvider.java
deleted file mode 100644
index 1336b78b3982b6630d0ad30e90bbc4cf88c6ee73..0000000000000000000000000000000000000000
--- a/content/public/android/java/src/org/chromium/content/browser/input/JoystickScrollProvider.java
+++ /dev/null
@@ -1,146 +0,0 @@
-// Copyright 2015 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.util.TypedValue;
-import android.view.InputDevice;
-import android.view.MotionEvent;
-import android.view.animation.AnimationUtils;
-
-import org.chromium.base.Log;
-import org.chromium.content.browser.ContentViewCore;
-
-/**
- * This class implements auto scrolling and panning for gamepad left joystick motion event.
- */
-public class JoystickScrollProvider {
-    private static final String TAG = "JoystickScroll";
-
-    private static final float JOYSTICK_SCROLL_FACTOR_MULTIPLIER = 20f;
-    // Joystick produces "noise", 0.20f has proven a safe value to
-    // remove noise and still allow reasonable input range.
-    private static final float JOYSTICK_SCROLL_DEADZONE = 0.2f;
-    private static final float SCROLL_FACTOR_FALLBACK = 128f;
-
-    private final ContentViewCore mView;
-
-    private float mScrollVelocityX;
-    private float mScrollVelocityY;
-    private float mScrollFactor;
-
-    private long mLastAnimateTimeMillis;
-
-    private boolean mEnabled;
-
-    private Runnable mScrollRunnable;
-
-    /**
-     * Constructs a new JoystickScrollProvider.
-     *
-     * @param contentview The ContentViewCore used to create this.
-     */
-    public JoystickScrollProvider(ContentViewCore contentView) {
-        mView = contentView;
-        mEnabled = true;
-    }
-
-    /**
-     * This function enables or disables scrolling through joystick.
-     * @param enabled Decides whether joystick scrolling should be
-     *                enabled or not.
-     */
-    public void setEnabled(boolean enabled) {
-        mEnabled = enabled;
-        if (!enabled) stop();
-    }
-
-    /**
-     * This function processes motion event and computes new
-     * scroll offest in pixels which is propertional to left joystick
-     * axes movement.
-     * It also starts runnable to scroll content view core equal to
-     * scroll offset pixels.
-     *
-     * @param event Motion event to be processed for scrolling.
-     * @return Whether scrolling using left joystick is performed or not.
-     */
-    public boolean onMotion(MotionEvent event) {
-        if (!mEnabled) return false;
-        if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) == 0) return false;
-        Log.d(TAG, "Joystick left stick axis: " + event.getAxisValue(MotionEvent.AXIS_X) + ","
-                + event.getAxisValue(MotionEvent.AXIS_Y));
-
-        computeNewScrollVelocity(event);
-        if (mScrollVelocityX == 0 && mScrollVelocityY == 0) {
-            stop();
-            return false;
-        }
-        if (mScrollRunnable == null) {
-            mScrollRunnable = new Runnable() {
-                @Override
-                public void run() {
-                    animateScroll();
-                }
-            };
-        }
-        if (mLastAnimateTimeMillis == 0) {
-            mView.getContainerView().postOnAnimation(mScrollRunnable);
-            mLastAnimateTimeMillis = AnimationUtils.currentAnimationTimeMillis();
-        }
-        return true;
-    }
-
-    private void animateScroll() {
-        if (mLastAnimateTimeMillis == 0) {
-            return;
-        }
-        final long timeMillis = AnimationUtils.currentAnimationTimeMillis();
-        final long dt = timeMillis - mLastAnimateTimeMillis;
-        final float dx = (mScrollVelocityX * dt / 1000.f);
-        final float dy = (mScrollVelocityY * dt / 1000.f);
-        mView.scrollBy(dx, dy, true);
-        mLastAnimateTimeMillis = timeMillis;
-        mView.getContainerView().postOnAnimation(mScrollRunnable);
-    }
-
-    private void stop() {
-        mLastAnimateTimeMillis = 0;
-    }
-
-    /**
-     * Translates joystick axes movement to a scroll velocity.
-     */
-    private void computeNewScrollVelocity(MotionEvent event) {
-        if (mScrollFactor == 0) {
-            TypedValue outValue = new TypedValue();
-            if (!mView.getContext().getTheme().resolveAttribute(
-                        android.R.attr.listPreferredItemHeight, outValue, true)) {
-                mScrollFactor = outValue.getDimension(
-                        mView.getContext().getResources().getDisplayMetrics());
-            } else {
-                Log.d(TAG, "Theme attribute listPreferredItemHeight not defined"
-                                + "switching to fallback scroll factor ");
-                mScrollFactor = SCROLL_FACTOR_FALLBACK
-                        * mView.getRenderCoordinates().getDeviceScaleFactor();
-            }
-        }
-        mScrollVelocityX = getFilteredAxisValue(event, MotionEvent.AXIS_X) * mScrollFactor
-                * JOYSTICK_SCROLL_FACTOR_MULTIPLIER;
-        mScrollVelocityY = getFilteredAxisValue(event, MotionEvent.AXIS_Y) * mScrollFactor
-                * JOYSTICK_SCROLL_FACTOR_MULTIPLIER;
-    }
-
-    /**
-     * Removes noise from joystick motion events.
-     */
-    private float getFilteredAxisValue(MotionEvent event, int axis) {
-        float axisValWithNoise = event.getAxisValue(axis);
-        if (axisValWithNoise > JOYSTICK_SCROLL_DEADZONE
-                || axisValWithNoise < -JOYSTICK_SCROLL_DEADZONE) {
-            return axisValWithNoise;
-        }
-        return 0f;
-    }
-}