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Notification of metrics changes.

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The Rendering layer binding now multiplexes the dart:ui metrics change
notification so that multiple consumers can all listen to the change.
This commit is contained in:
Hixie 2015-10-27 14:24:02 -07:00
parent 5855f72202
commit e34aefbd8a
1 changed files with 17 additions and 7 deletions
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24
sky/packages/sky/lib/src/rendering/binding.dart
View File

@ -13,6 +13,9 @@ import 'hit_test.dart';
import 'object.dart';
import 'view.dart';
typedef void EventListener(InputEvent event);
typedef void MetricListener(Size size);
int _hammingWeight(int value) {
if (value == 0)
return 0;
@ -24,8 +27,6 @@ int _hammingWeight(int value) {
return weight;
}
typedef void EventListener(InputEvent event);
/// A hit test entry used by [FlutterBinding]
class BindingHitTestEntry extends HitTestEntry {
const BindingHitTestEntry(HitTestTarget target, this.result) : super(target);
@ -137,7 +138,7 @@ class FlutterBinding extends HitTestTarget {
if (renderViewOverride == null) {
_renderView = new RenderView(child: root);
_renderView.attach();
_renderView.rootConstraints = _createConstraints();
_handleMetricsChanged();
_renderView.scheduleInitialFrame();
} else {
_renderView = renderViewOverride;
@ -156,11 +157,19 @@ class FlutterBinding extends HitTestTarget {
RenderView get renderView => _renderView;
RenderView _renderView;
ViewConstraints _createConstraints() {
return new ViewConstraints(size: new Size(ui.view.width, ui.view.height));
}
final List<MetricListener> _metricListeners = new List<MetricListener>();
/// Calls listener for every event that isn't localized to a given view coordinate
void addMetricListener(MetricListener listener) => _metricListeners.add(listener);
/// Stops calling listener for every event that isn't localized to a given view coordinate
bool removeMetricListener(MetricListener listener) => _metricListeners.remove(listener);
void _handleMetricsChanged() {
_renderView.rootConstraints = _createConstraints();
Size size = new Size(ui.view.width, ui.view.height);
_renderView.rootConstraints = new ViewConstraints(size: size);
for (MetricListener listener in _metricListeners)
listener(size);
}
/// Pump the rendering pipeline to generate a frame for the given time stamp
@ -184,6 +193,7 @@ class FlutterBinding extends HitTestTarget {
if (ourEvent is PointerInputEvent) {
_handlePointerInputEvent(ourEvent);
} else {
assert(event.type == 'back');
for (EventListener listener in _eventListeners)
listener(ourEvent);
}