1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include "TestSceneBase.h"
18 #include "tests/common/TestListViewSceneBase.h"
19 
20 #include <SkGradientShader.h>
21 
22 class ListOfFadedTextAnimation;
23 
24 static TestScene::Registrar _ListOfFadedTextAnimation(TestScene::Info{
25         "fadingedges",
26         "A mock ListView of scrolling text with faded edge. Doesn't re-bind/re-record views"
27         "as they are recycled, so won't upload much content (either glyphs, or bitmaps).",
28         TestScene::simpleCreateScene<ListOfFadedTextAnimation>});
29 
30 class ListOfFadedTextAnimation : public TestListViewSceneBase {
createListItem(RenderProperties & props,Canvas & canvas,int id,int itemWidth,int itemHeight)31     void createListItem(RenderProperties& props, Canvas& canvas, int id, int itemWidth,
32                         int itemHeight) override {
33         canvas.drawColor(Color::White, SkBlendMode::kSrcOver);
34         int length = dp(100);
35         canvas.saveLayer(0, 0, length, itemHeight, nullptr, SaveFlags::HasAlphaLayer);
36         SkPaint textPaint;
37         textPaint.setTextSize(dp(20));
38         textPaint.setAntiAlias(true);
39         TestUtils::drawUtf8ToCanvas(&canvas, "not that long long text", textPaint, dp(10), dp(30));
40 
41         SkPoint pts[2];
42         pts[0].set(0, 0);
43         pts[1].set(0, 1);
44 
45         SkColor colors[2] = {Color::Black, Color::Transparent};
46         sk_sp<SkShader> s(
47                 SkGradientShader::MakeLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode));
48 
49         SkMatrix matrix;
50         matrix.setScale(1, length);
51         matrix.postRotate(-90);
52         SkPaint fadingPaint;
53         fadingPaint.setShader(s->makeWithLocalMatrix(matrix));
54         fadingPaint.setBlendMode(SkBlendMode::kDstOut);
55         canvas.drawRect(0, 0, length, itemHeight, fadingPaint);
56         canvas.restore();
57     }
58 };
59