The Tor Browser / file comparison
comparison: mobile/android/base/ScrollAnimator.java
mobile/android/base/ScrollAnimator.java
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
equal
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replaced
| -1:000000000000 | 0:83183b4ff3c1 |
|---|---|
| 1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*- | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this file, | |
| 4 * You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 package org.mozilla.gecko; | |
| 7 | |
| 8 import java.util.Timer; | |
| 9 import java.util.TimerTask; | |
| 10 | |
| 11 import org.mozilla.gecko.util.GamepadUtils; | |
| 12 | |
| 13 import android.view.InputDevice; | |
| 14 import android.view.MotionEvent; | |
| 15 import android.view.View; | |
| 16 | |
| 17 public class ScrollAnimator implements View.OnGenericMotionListener { | |
| 18 private Timer mScrollTimer; | |
| 19 private int mX; | |
| 20 private int mY; | |
| 21 | |
| 22 // Assuming 60fps, this will make the view scroll once per frame | |
| 23 static final long MS_PER_FRAME = 1000 / 60; | |
| 24 | |
| 25 // Maximum number of pixels that can be scrolled per frame | |
| 26 static final float MAX_SCROLL = 0.075f * GeckoAppShell.getDpi(); | |
| 27 | |
| 28 private class ScrollRunnable extends TimerTask { | |
| 29 private View mView; | |
| 30 | |
| 31 public ScrollRunnable(View view) { | |
| 32 mView = view; | |
| 33 } | |
| 34 | |
| 35 @Override | |
| 36 public final void run() { | |
| 37 mView.scrollBy(mX, mY); | |
| 38 } | |
| 39 } | |
| 40 | |
| 41 @Override | |
| 42 public boolean onGenericMotion(View view, MotionEvent event) { | |
| 43 if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { | |
| 44 switch (event.getAction()) { | |
| 45 case MotionEvent.ACTION_MOVE: | |
| 46 // Cancel the animation if the joystick is in a neutral position | |
| 47 if (GamepadUtils.isValueInDeadZone(event, MotionEvent.AXIS_X) && | |
| 48 GamepadUtils.isValueInDeadZone(event, MotionEvent.AXIS_Y)) { | |
| 49 if (mScrollTimer != null) { | |
| 50 mScrollTimer.cancel(); | |
| 51 mScrollTimer = null; | |
| 52 } | |
| 53 return true; | |
| 54 } | |
| 55 | |
| 56 // Scroll with a velocity relative to the screen DPI | |
| 57 mX = (int) (event.getAxisValue(MotionEvent.AXIS_X) * MAX_SCROLL); | |
| 58 mY = (int) (event.getAxisValue(MotionEvent.AXIS_Y) * MAX_SCROLL); | |
| 59 | |
| 60 // Start the timer; the view will continue to scroll as long as | |
| 61 // the joystick is not in the deadzone. | |
| 62 if (mScrollTimer == null) { | |
| 63 mScrollTimer = new Timer(); | |
| 64 ScrollRunnable task = new ScrollRunnable(view); | |
| 65 mScrollTimer.scheduleAtFixedRate(task, 0, MS_PER_FRAME); | |
| 66 } | |
| 67 | |
| 68 return true; | |
| 69 } | |
| 70 } | |
| 71 | |
| 72 return false; | |
| 73 } | |
| 74 | |
| 75 /** | |
| 76 * Cancels the running scroll animation if it is in progress. | |
| 77 */ | |
| 78 public void cancel() { | |
| 79 if (mScrollTimer != null) { | |
| 80 mScrollTimer.cancel(); | |
| 81 mScrollTimer = null; | |
| 82 } | |
| 83 } | |
| 84 } |
