mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Seth Kirby
192c99a4f6
Summary: This optimizes node region searches in clipping cases, and does position calculation for drawCommands off of the UI thread. Reviewed By: ahmedre Differential Revision: D3665301
47 lines
1.4 KiB
Java
47 lines
1.4 KiB
Java
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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package com.facebook.react.flat;
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import android.graphics.Canvas;
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/**
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* DrawCommand is an interface that shadow nodes need to implement to do the drawing.
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* Instances of DrawCommand are created in background thread and passed to UI thread.
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* Once a DrawCommand is shared with UI thread, it can no longer be mutated in background thread.
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*/
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public abstract class DrawCommand {
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// used by StateBuilder, FlatViewGroup and FlatShadowNode
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/* package */ static final DrawCommand[] EMPTY_ARRAY = new DrawCommand[0];
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/**
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* Performs drawing into the given canvas.
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*
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* @param parent The parent to get child information from, if needed
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* @param canvas The canvas to draw into
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*/
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abstract void draw(FlatViewGroup parent, Canvas canvas);
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/**
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* Performs debug bounds drawing into the given canvas.
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*
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* @param parent The parent to get child information from, if needed
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* @param canvas The canvas to draw into
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*/
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abstract void debugDraw(FlatViewGroup parent, Canvas canvas);
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abstract float getLeft();
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abstract float getTop();
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abstract float getRight();
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abstract float getBottom();
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}
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