The Tor Browser / file comparison
comparison: mobile/android/base/gfx/OverscrollEdgeEffect.java
mobile/android/base/gfx/OverscrollEdgeEffect.java
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| 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 | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 package org.mozilla.gecko.gfx; | |
| 7 | |
| 8 import android.content.Context; | |
| 9 import android.graphics.Canvas; | |
| 10 import android.os.Build; | |
| 11 import android.widget.EdgeEffect; | |
| 12 import android.view.View; | |
| 13 | |
| 14 | |
| 15 public class OverscrollEdgeEffect implements Overscroll { | |
| 16 // Used to index particular edges in the edges array | |
| 17 private static final int TOP = 0; | |
| 18 private static final int BOTTOM = 1; | |
| 19 private static final int LEFT = 2; | |
| 20 private static final int RIGHT = 3; | |
| 21 | |
| 22 // All four edges of the screen | |
| 23 private final EdgeEffect[] mEdges = new EdgeEffect[4]; | |
| 24 | |
| 25 // The view we're showing this overscroll on. | |
| 26 private final View mView; | |
| 27 | |
| 28 public OverscrollEdgeEffect(final View v) { | |
| 29 mView = v; | |
| 30 Context context = v.getContext(); | |
| 31 for (int i = 0; i < 4; i++) { | |
| 32 mEdges[i] = new EdgeEffect(context); | |
| 33 } | |
| 34 } | |
| 35 | |
| 36 public void setSize(final int width, final int height) { | |
| 37 mEdges[LEFT].setSize(height, width); | |
| 38 mEdges[RIGHT].setSize(height, width); | |
| 39 mEdges[TOP].setSize(width, height); | |
| 40 mEdges[BOTTOM].setSize(width, height); | |
| 41 } | |
| 42 | |
| 43 private EdgeEffect getEdgeForAxisAndSide(final Axis axis, final float side) { | |
| 44 if (axis == Axis.Y) { | |
| 45 if (side < 0) { | |
| 46 return mEdges[TOP]; | |
| 47 } else { | |
| 48 return mEdges[BOTTOM]; | |
| 49 } | |
| 50 } else { | |
| 51 if (side < 0) { | |
| 52 return mEdges[LEFT]; | |
| 53 } else { | |
| 54 return mEdges[RIGHT]; | |
| 55 } | |
| 56 } | |
| 57 } | |
| 58 | |
| 59 private void invalidate() { | |
| 60 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { | |
| 61 mView.postInvalidateOnAnimation(); | |
| 62 } else { | |
| 63 mView.postInvalidateDelayed(10); | |
| 64 } | |
| 65 } | |
| 66 | |
| 67 public void setVelocity(final float velocity, final Axis axis) { | |
| 68 final EdgeEffect edge = getEdgeForAxisAndSide(axis, velocity); | |
| 69 | |
| 70 // If we're showing overscroll already, start fading it out. | |
| 71 if (!edge.isFinished()) { | |
| 72 edge.onRelease(); | |
| 73 } else { | |
| 74 // Otherwise, show an absorb effect | |
| 75 edge.onAbsorb((int)velocity); | |
| 76 } | |
| 77 | |
| 78 invalidate(); | |
| 79 } | |
| 80 | |
| 81 public void setDistance(final float distance, final Axis axis) { | |
| 82 // The first overscroll event often has zero distance. Throw it out | |
| 83 if (distance == 0.0f) { | |
| 84 return; | |
| 85 } | |
| 86 | |
| 87 final EdgeEffect edge = getEdgeForAxisAndSide(axis, (int)distance); | |
| 88 edge.onPull(distance / (axis == Axis.X ? mView.getWidth() : mView.getHeight())); | |
| 89 invalidate(); | |
| 90 } | |
| 91 | |
| 92 public void draw(final Canvas canvas, final ImmutableViewportMetrics metrics) { | |
| 93 if (metrics == null) { | |
| 94 return; | |
| 95 } | |
| 96 | |
| 97 // If we're pulling an edge, or fading it out, draw! | |
| 98 boolean invalidate = false; | |
| 99 if (!mEdges[TOP].isFinished()) { | |
| 100 invalidate |= draw(mEdges[TOP], canvas, metrics.marginLeft, metrics.marginTop, 0); | |
| 101 } | |
| 102 | |
| 103 if (!mEdges[BOTTOM].isFinished()) { | |
| 104 invalidate |= draw(mEdges[BOTTOM], canvas, mView.getWidth(), mView.getHeight(), 180); | |
| 105 } | |
| 106 | |
| 107 if (!mEdges[LEFT].isFinished()) { | |
| 108 invalidate |= draw(mEdges[LEFT], canvas, metrics.marginLeft, mView.getHeight(), 270); | |
| 109 } | |
| 110 | |
| 111 if (!mEdges[RIGHT].isFinished()) { | |
| 112 invalidate |= draw(mEdges[RIGHT], canvas, mView.getWidth(), metrics.marginTop, 90); | |
| 113 } | |
| 114 | |
| 115 // If the edge effect is animating off screen, invalidate. | |
| 116 if (invalidate) { | |
| 117 invalidate(); | |
| 118 } | |
| 119 } | |
| 120 | |
| 121 public boolean draw(final EdgeEffect edge, final Canvas canvas, final float translateX, final float translateY, final float rotation) { | |
| 122 final int state = canvas.save(); | |
| 123 canvas.translate(translateX, translateY); | |
| 124 canvas.rotate(rotation); | |
| 125 boolean invalidate = edge.draw(canvas); | |
| 126 canvas.restoreToCount(state); | |
| 127 | |
| 128 return invalidate; | |
| 129 } | |
| 130 } |
