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68b06c8736
Rather than using the DOM to upload text and styling information into the engine, this patch begins sketching a more direct API that bypasses the DOM and CSS. Currently, this API doesn't do anything, but it's a first step. The approach is to have a ParagraphBuilder object that can record a tree of style interior nodes and text leaves. The build() function then applies container-level styling information (such as TextAlign) and returns a Paragraph object that can undergo layout and paint. The inputs to the builder process are immutable style objects constructed from primitive values. These primitives are currently carbon-copies of the primitive we use in the framework today. After this patch lands, I'll convert the frame to re-expose these values instead of re-defining them.
23 lines
895 B
Plaintext
23 lines
895 B
Plaintext
// Copyright 2015 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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interface Paragraph {
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// Inputs to layout
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attribute double minWidth;
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attribute double maxWidth;
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attribute double minHeight;
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attribute double maxHeight;
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// Outputs from layout
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readonly attribute double width;
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readonly attribute double height;
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readonly attribute double minIntrinsicWidth; // Intrinsic width if all wrappable points wrap.
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readonly attribute double maxIntrinsicWidth; // Intrinsic width if no wrappable points wrap.
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readonly attribute double alphabeticBaseline; // Distance from top to alphabetic baseline of first line
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readonly attribute double ideographicBaseline; // Distance from top to ideographic baseline of first line
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void layout();
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void paint(Canvas canvas, Offset offset);
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};
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