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a94999ba50
Each layer is supposed to reexport the parts of the previous layer that are part of its API. - In painting.dart, export from dart:ui all the Canvas-related APIs that make sense to be used at higher levels, e.g. PaintingStyle. - Delete painting/shadows.dart. It was dead code. - In rendering/object.dart, export all of painting.dart. - In widgets/basic.dart, export all of painting.dart and animation.dart. Some classes in animation/ are renamed to make this less disruptive and confusing to the namespace. - Split out Stocks back into an import model rather than a part model, so that it's easier to manage its dependencies on a per-file basis. - Move Ticker to scheduler library. - Remove as many redundant imports as possible now. - Some minor nit picking cleanup in various files.
40 lines
1.4 KiB
Dart
40 lines
1.4 KiB
Dart
part of flutter_sprites;
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/// A [Node] that provides an intermediate rendering surface in the sprite
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/// rendering tree. A [Layer] can be used to change the opacity, color, or to
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/// apply an effect to a set of nodes. All nodes that are children to the
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/// [Layer] will be rendered into the surface. If the area that is needed for
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/// the children to be drawn is know, the [layerRect] property should be set as
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/// this can enhance performance.
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class Layer extends Node with SpritePaint {
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/// The area that the children of the [Layer] will occupy. This value is
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/// treated as a hint to the rendering system and may in some cases be
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/// ignored. If the area isn't known, the layerRect can be set to [null].
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///
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/// myLayer.layerRect = new Rect.fromLTRB(0.0, 0.0, 200.0, 100.0);
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Rect layerRect;
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/// Creates a new layer. The layerRect can optionally be passed as an argument
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/// if it is known.
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///
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/// var myLayer = new Layer();
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Layer([this.layerRect = null]);
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Paint _cachedPaint = new Paint()
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..filterQuality = FilterQuality.low
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..isAntiAlias = false;
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void _prePaint(Canvas canvas, Matrix4 matrix) {
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super._prePaint(canvas, matrix);
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_updatePaint(_cachedPaint);
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canvas.saveLayer(layerRect, _cachedPaint);
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}
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void _postPaint(Canvas canvas, Matrix4 totalMatrix) {
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canvas.restore();
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super._postPaint(canvas, totalMatrix);
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}
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}
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