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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 package org.chromium.chrome.browser.widget; | |
6 | |
7 /** | |
8 * Progress bar animation logic that starts fast at the beginning and slows down approaching to the | |
9 * end. | |
10 */ | |
11 class ProgressAnimationFastStart implements ToolbarProgressBar.AnimationLogic { | |
12 private static final float NORMALIZED_INITIAL_SPEED = 1.5f; | |
David Trainor- moved to gerrit
2015/07/31 21:01:51
Can we add units to these? Are these in dp, perce
Kibeom Kim (inactive)
2015/07/31 21:42:50
This is a normalized scale, 0 to 1, and I wasn't s
| |
13 private static final float FINISHING_SPEED = 2.0f; | |
14 | |
15 private float mProgress; | |
16 | |
17 @Override | |
18 public void reset() { | |
19 mProgress = 0.0f; | |
20 } | |
21 | |
22 @Override | |
23 public float updateProgress(float targetProgress, float frameTimeSec, int re solution) { | |
24 assert mProgress <= targetProgress; | |
25 | |
26 float progressChange; | |
27 if (targetProgress == 1.0f) { | |
28 progressChange = FINISHING_SPEED * frameTimeSec; | |
29 } else { | |
30 progressChange = (targetProgress - mProgress) | |
31 * (1.0f - (float) Math.exp(-frameTimeSec * NORMALIZED_INITIA L_SPEED)); | |
32 } | |
33 | |
34 mProgress = Math.min(mProgress + progressChange, targetProgress); | |
35 if (targetProgress - mProgress < 0.5f / resolution) mProgress = targetPr ogress; | |
36 | |
37 return mProgress; | |
38 } | |
39 } | |
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