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mobile/android/base/gfx/OverscrollEdgeEffect.java@b8a032363ba2 (annotated)

mobile/android/base/gfx/OverscrollEdgeEffect.java

Thu, 22 Jan 2015 13:21:57 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 22 Jan 2015 13:21:57 +0100

branch

TOR_BUG_9701

changeset 15

b8a032363ba2

permissions

-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0	1	/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
michael@0	2	* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	3	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	4	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	5
michael@0	6	package org.mozilla.gecko.gfx;
michael@0	7
michael@0	8	import android.content.Context;
michael@0	9	import android.graphics.Canvas;
michael@0	10	import android.os.Build;
michael@0	11	import android.widget.EdgeEffect;
michael@0	12	import android.view.View;
michael@0	13
michael@0	14
michael@0	15	public class OverscrollEdgeEffect implements Overscroll {
michael@0	16	// Used to index particular edges in the edges array
michael@0	17	private static final int TOP = 0;
michael@0	18	private static final int BOTTOM = 1;
michael@0	19	private static final int LEFT = 2;
michael@0	20	private static final int RIGHT = 3;
michael@0	21
michael@0	22	// All four edges of the screen
michael@0	23	private final EdgeEffect[] mEdges = new EdgeEffect[4];
michael@0	24
michael@0	25	// The view we're showing this overscroll on.
michael@0	26	private final View mView;
michael@0	27
michael@0	28	public OverscrollEdgeEffect(final View v) {
michael@0	29	mView = v;
michael@0	30	Context context = v.getContext();
michael@0	31	for (int i = 0; i < 4; i++) {
michael@0	32	mEdges[i] = new EdgeEffect(context);
michael@0	33	}
michael@0	34	}
michael@0	35
michael@0	36	public void setSize(final int width, final int height) {
michael@0	37	mEdges[LEFT].setSize(height, width);
michael@0	38	mEdges[RIGHT].setSize(height, width);
michael@0	39	mEdges[TOP].setSize(width, height);
michael@0	40	mEdges[BOTTOM].setSize(width, height);
michael@0	41	}
michael@0	42
michael@0	43	private EdgeEffect getEdgeForAxisAndSide(final Axis axis, final float side) {
michael@0	44	if (axis == Axis.Y) {
michael@0	45	if (side < 0) {
michael@0	46	return mEdges[TOP];
michael@0	47	} else {
michael@0	48	return mEdges[BOTTOM];
michael@0	49	}
michael@0	50	} else {
michael@0	51	if (side < 0) {
michael@0	52	return mEdges[LEFT];
michael@0	53	} else {
michael@0	54	return mEdges[RIGHT];
michael@0	55	}
michael@0	56	}
michael@0	57	}
michael@0	58
michael@0	59	private void invalidate() {
michael@0	60	if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
michael@0	61	mView.postInvalidateOnAnimation();
michael@0	62	} else {
michael@0	63	mView.postInvalidateDelayed(10);
michael@0	64	}
michael@0	65	}
michael@0	66
michael@0	67	public void setVelocity(final float velocity, final Axis axis) {
michael@0	68	final EdgeEffect edge = getEdgeForAxisAndSide(axis, velocity);
michael@0	69
michael@0	70	// If we're showing overscroll already, start fading it out.
michael@0	71	if (!edge.isFinished()) {
michael@0	72	edge.onRelease();
michael@0	73	} else {
michael@0	74	// Otherwise, show an absorb effect
michael@0	75	edge.onAbsorb((int)velocity);
michael@0	76	}
michael@0	77
michael@0	78	invalidate();
michael@0	79	}
michael@0	80
michael@0	81	public void setDistance(final float distance, final Axis axis) {
michael@0	82	// The first overscroll event often has zero distance. Throw it out
michael@0	83	if (distance == 0.0f) {
michael@0	84	return;
michael@0	85	}
michael@0	86
michael@0	87	final EdgeEffect edge = getEdgeForAxisAndSide(axis, (int)distance);
michael@0	88	edge.onPull(distance / (axis == Axis.X ? mView.getWidth() : mView.getHeight()));
michael@0	89	invalidate();
michael@0	90	}
michael@0	91
michael@0	92	public void draw(final Canvas canvas, final ImmutableViewportMetrics metrics) {
michael@0	93	if (metrics == null) {
michael@0	94	return;
michael@0	95	}
michael@0	96
michael@0	97	// If we're pulling an edge, or fading it out, draw!
michael@0	98	boolean invalidate = false;
michael@0	99	if (!mEdges[TOP].isFinished()) {
michael@0	100	invalidate |= draw(mEdges[TOP], canvas, metrics.marginLeft, metrics.marginTop, 0);
michael@0	101	}
michael@0	102
michael@0	103	if (!mEdges[BOTTOM].isFinished()) {
michael@0	104	invalidate |= draw(mEdges[BOTTOM], canvas, mView.getWidth(), mView.getHeight(), 180);
michael@0	105	}
michael@0	106
michael@0	107	if (!mEdges[LEFT].isFinished()) {
michael@0	108	invalidate |= draw(mEdges[LEFT], canvas, metrics.marginLeft, mView.getHeight(), 270);
michael@0	109	}
michael@0	110
michael@0	111	if (!mEdges[RIGHT].isFinished()) {
michael@0	112	invalidate |= draw(mEdges[RIGHT], canvas, mView.getWidth(), metrics.marginTop, 90);
michael@0	113	}
michael@0	114
michael@0	115	// If the edge effect is animating off screen, invalidate.
michael@0	116	if (invalidate) {
michael@0	117	invalidate();
michael@0	118	}
michael@0	119	}
michael@0	120
michael@0	121	public boolean draw(final EdgeEffect edge, final Canvas canvas, final float translateX, final float translateY, final float rotation) {
michael@0	122	final int state = canvas.save();
michael@0	123	canvas.translate(translateX, translateY);
michael@0	124	canvas.rotate(rotation);
michael@0	125	boolean invalidate = edge.draw(canvas);
michael@0	126	canvas.restoreToCount(state);
michael@0	127
michael@0	128	return invalidate;
michael@0	129	}
michael@0	130	}