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21d7575716
We'll use this function to position the caret when the user taps a text input control. Very little of the code in this patch is actually new. Most of it is restoring code that we previously removed from the engine. I've made some small changes to the restored code to handle the lack of a DOM. The only major change is to RenderObject::createPositionWithAffinity, which now just returns the values it captures instead of trying to compute a DOM position. TextAffinity and TextPosition are lifted from package:flutter. Once this patch rolls into package:flutter, I'll remove the declarations there.
45 lines
1.4 KiB
C++
45 lines
1.4 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef SKY_ENGINE_CORE_EDITING_POSITIONWITHAFFINITY_H_
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#define SKY_ENGINE_CORE_EDITING_POSITIONWITHAFFINITY_H_
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namespace blink {
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class RenderObject;
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enum EAffinity { UPSTREAM, DOWNSTREAM };
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// VisiblePosition default affinity is downstream because
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// the callers do not really care (they just want the
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// deep position without regard to line position), and this
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// is cheaper than UPSTREAM
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#define VP_DEFAULT_AFFINITY DOWNSTREAM
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// Callers who do not know where on the line the position is,
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// but would like UPSTREAM if at a line break or DOWNSTREAM
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// otherwise, need a clear way to specify that. The
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// constructors auto-correct UPSTREAM to DOWNSTREAM if the
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// position is not at a line break.
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#define VP_UPSTREAM_IF_POSSIBLE UPSTREAM
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class PositionWithAffinity {
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public:
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PositionWithAffinity(RenderObject* renderer, int offset, EAffinity = DOWNSTREAM);
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~PositionWithAffinity();
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RenderObject* renderer() const { return m_renderer; }
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int offset() const { return m_offset; }
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EAffinity affinity() const { return m_affinity; }
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private:
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RenderObject* m_renderer;
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int m_offset;
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EAffinity m_affinity;
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};
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} // namespace blink
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#endif // SKY_ENGINE_CORE_EDITING_POSITIONWITHAFFINITY_H_
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