ListViewAnimation.cpp revision afbd0f1fef46ef0ddf633dfde0de724db3da1405 
1/*
2 * Copyright (C) 2015 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 "utils/Color.h"
19
20#include <cstdio>
21
22class ListViewAnimation;
23
24static TestScene::Registrar _ListView(TestScene::Info{
25    "listview",
26    "A mock ListView of scrolling content. Doesn't re-bind/re-record views as they are recycled, so"
27    "won't upload much content (either glyphs, or bitmaps).",
28    TestScene::simpleCreateScene<ListViewAnimation>
29});
30
31class ListViewAnimation : public TestScene {
32public:
33    int cardHeight;
34    int cardSpacing;
35    int cardWidth;
36    int cardLeft;
37    sp<RenderNode> listView;
38    std::vector< sp<RenderNode> > cards;
39    void createContent(int width, int height, TestCanvas& canvas) override {
40        srand(0);
41        cardHeight = dp(60);
42        cardSpacing = dp(16);
43        cardWidth = std::min((height - cardSpacing * 2), (int)dp(300));
44        cardLeft = (width - cardWidth) / 2;
45
46        for (int y = 0; y < height + (cardHeight + cardSpacing - 1); y += (cardHeight + cardSpacing)) {
47            cards.push_back(createCard(cards.size(), y));
48        }
49        listView = TestUtils::createNode(0, 0, width, height,
50                [this](RenderProperties& props, TestCanvas& canvas) {
51            for (size_t ci = 0; ci < cards.size(); ci++) {
52                canvas.drawRenderNode(cards[ci].get());
53            }
54        });
55
56        canvas.drawColor(Color::Grey_500, SkXfermode::kSrcOver_Mode);
57        canvas.drawRenderNode(listView.get());
58    }
59
60    void doFrame(int frameNr) override {
61        int scrollPx = dp(frameNr) * 3;
62        int cardIndexOffset = scrollPx / (cardSpacing + cardHeight);
63        int pxOffset = -(scrollPx % (cardSpacing + cardHeight));
64
65        TestCanvas canvas(
66                listView->stagingProperties().getWidth(),
67                listView->stagingProperties().getHeight());
68        for (size_t ci = 0; ci < cards.size(); ci++) {
69            // update card position
70            auto card = cards[(ci + cardIndexOffset) % cards.size()];
71            int top = ((int)ci) * (cardSpacing + cardHeight) + pxOffset;
72            card->mutateStagingProperties().setLeftTopRightBottom(
73                    cardLeft, top, cardLeft + cardWidth, top + cardHeight);
74            card->setPropertyFieldsDirty(RenderNode::X | RenderNode::Y);
75
76            // draw it to parent DisplayList
77            canvas.drawRenderNode(cards[ci].get());
78        }
79        listView->setStagingDisplayList(canvas.finishRecording());
80    }
81private:
82    SkBitmap createRandomCharIcon() {
83        int size = cardHeight - (dp(10) * 2);
84        SkBitmap bitmap = TestUtils::createSkBitmap(size, size);
85        SkCanvas canvas(bitmap);
86        canvas.clear(0);
87
88        SkPaint paint;
89        paint.setAntiAlias(true);
90        SkColor randomColor = BrightColors[rand() % BrightColorsCount];
91        paint.setColor(randomColor);
92        canvas.drawCircle(size / 2, size / 2, size / 2, paint);
93
94        bool bgDark = SkColorGetR(randomColor) + SkColorGetG(randomColor) + SkColorGetB(randomColor)
95                < 128 * 3;
96        paint.setColor(bgDark ? Color::White : Color::Grey_700);
97        paint.setTextAlign(SkPaint::kCenter_Align);
98        paint.setTextSize(size / 2);
99        char charToShow = 'A' + (rand() % 26);
100        canvas.drawText(&charToShow, 1, size / 2, /*approximate centering*/ size * 0.7, paint);
101        return bitmap;
102    }
103
104    static SkBitmap createBoxBitmap(bool filled) {
105        int size = dp(20);
106        int stroke = dp(2);
107        SkBitmap bitmap = TestUtils::createSkBitmap(size, size);
108        SkCanvas canvas(bitmap);
109        canvas.clear(Color::Transparent);
110
111        SkPaint paint;
112        paint.setAntiAlias(true);
113        paint.setColor(filled ? Color::Yellow_500 : Color::Grey_700);
114        paint.setStyle(filled ? SkPaint::kStrokeAndFill_Style : SkPaint::kStroke_Style);
115        paint.setStrokeWidth(stroke);
116        canvas.drawRect(SkRect::MakeLTRB(stroke, stroke, size - stroke, size - stroke), paint);
117        return bitmap;
118    }
119
120    sp<RenderNode> createCard(int cardId, int top) {
121        return TestUtils::createNode(cardLeft, top, cardLeft + cardWidth, top + cardHeight,
122                [this, cardId](RenderProperties& props, TestCanvas& canvas) {
123            static SkBitmap filledBox = createBoxBitmap(true);
124            static SkBitmap strokedBox = createBoxBitmap(false);
125
126            // TODO: switch to using round rect clipping, once merging correctly handles that
127            SkPaint roundRectPaint;
128            roundRectPaint.setAntiAlias(true);
129            roundRectPaint.setColor(Color::White);
130            canvas.drawRoundRect(0, 0, cardWidth, cardHeight, dp(6), dp(6), roundRectPaint);
131
132            SkPaint textPaint;
133            textPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
134            textPaint.setColor(rand() % 2 ? Color::Black : Color::Grey_500);
135            textPaint.setTextSize(dp(20));
136            textPaint.setAntiAlias(true);
137            char buf[256];
138            snprintf(buf, sizeof(buf), "This card is #%d", cardId);
139            TestUtils::drawTextToCanvas(&canvas, buf, textPaint, cardHeight, dp(25));
140            textPaint.setTextSize(dp(15));
141            TestUtils::drawTextToCanvas(&canvas, "This is some more text on the card", textPaint,
142                    cardHeight, dp(45));
143
144            canvas.drawBitmap(createRandomCharIcon(), dp(10), dp(10), nullptr);
145
146            const SkBitmap& boxBitmap = rand() % 2 ? filledBox : strokedBox;
147            canvas.drawBitmap(boxBitmap, cardWidth - dp(10) - boxBitmap.width(), dp(10), nullptr);
148        });
149    }
150};
151