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Implement a simple image cache for Sky in Dart. This doesn't yet do any eviction from the cache.

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R=abarth@chromium.org, abarth

Review URL: https://codereview.chromium.org/1165753004
This commit is contained in:
Collin Jackson 2015-06-02 10:44:48 -07:00
parent 2fe4b05e6d
commit dc9635dd33
1 changed files with 29 additions and 9 deletions
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38
examples/raw/spinning_image.dart
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@ -3,10 +3,13 @@
// found in the LICENSE file.
import 'dart:sky';
import 'package:sky/framework/net/image_cache.dart' as image_cache;
double timeBase = null;
Image image = null;
String url1 = "https://www.dartlang.org/logos/dart-logo.png";
String url2 = "http://i2.kym-cdn.com/photos/images/facebook/000/581/296/c09.jpg";
void beginFrame(double timeStamp) {
if (timeBase == null) timeBase = timeStamp;
@ -22,15 +25,32 @@ void beginFrame(double timeStamp) {
view.scheduleFrame();
}
void handleImageLoad(result) {
if (result != image) {
print("${result.width}x${result.width} image loaded!");
image = result;
view.scheduleFrame();
} else {
print("Existing image was loaded again");
}
}
bool handleEvent(Event event) {
if (event.type == "pointerdown") {
return true;
}
if (event.type == "pointerup") {
image_cache.load(url2, handleImageLoad);
return true;
}
return false;
}
void main() {
new ImageLoader("https://www.dartlang.org/logos/dart-logo.png", (result) {
if (result != null) {
print("${result.width}x${result.width} image loaded!");
image = result;
view.scheduleFrame();
} else {
print("Image failed to load");
}
}).load();
image_cache.load(url1, handleImageLoad);
image_cache.load(url1, handleImageLoad);
view.setEventCallback(handleEvent);
view.setBeginFrameCallback(beginFrame);
}