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体验新版 GitCode,发现更多精彩内容 >>
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5bf4deb4
编写于
11月 27, 2018
作者:
A
Amir Hardon
提交者:
GitHub
11月 27, 2018
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Update Dartdoc for SceneBuilder#addPlatformView (#6957)
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-1
lib/ui/compositing.dart
lib/ui/compositing.dart
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lib/ui/compositing.dart
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5bf4deb4
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@@ -274,7 +274,20 @@ class SceneBuilder extends NativeFieldWrapperClass2 {
/// Adds a platform view (e.g an iOS UIView) to the scene.
///
/// This is work in progress and is not currently supported on any platform.
/// Only supported on iOS, this is currently a no-op on other platforms.
///
/// On iOS this layer splits the current output surface into two surfaces, one for the scene nodes
/// preceding the platform view, and one for the scene nodes following the platform view.
///
/// ## Performance impact
///
/// Adding an additional surface doubles the amount of graphics memory directly used by Flutter
/// for output buffers. Quartz might allocated extra buffers for compositing the Flutter surfaces
/// and the platform view.
///
/// With a platform view in the scene, Quartz has to composite the two Flutter surfaces and the
/// embedded UIView. In addition to that, on iOS versions greater than 9, the Flutter frames are
/// synchronized with the UIView frames adding additional performance overhead.
void
addPlatformView
(
int
viewId
,
{
Offset
offset:
Offset
.
zero
,
double
width:
0.0
,
double
height:
0.0
})
{
assert
(
offset
!=
null
,
'Offset argument was null'
);
_addPlatformView
(
offset
.
dx
,
offset
.
dy
,
width
,
height
,
viewId
);
...
...
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