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69 lines
2.4 KiB
69 lines
2.4 KiB
// Copyright 2019 Google LLC.
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#ifndef ParagraphBuilder_DEFINED
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#define ParagraphBuilder_DEFINED
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#include <memory>
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#include <stack>
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#include <string>
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#include <tuple>
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#include "modules/skparagraph/include/FontCollection.h"
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#include "modules/skparagraph/include/Paragraph.h"
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#include "modules/skparagraph/include/ParagraphStyle.h"
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#include "modules/skparagraph/include/TextStyle.h"
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namespace skia {
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namespace textlayout {
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class ParagraphBuilder {
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public:
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ParagraphBuilder(const ParagraphStyle&, sk_sp<FontCollection>) { }
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virtual ~ParagraphBuilder() = default;
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// Push a style to the stack. The corresponding text added with AddText will
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// use the top-most style.
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virtual void pushStyle(const TextStyle& style) = 0;
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// Remove a style from the stack. Useful to apply different styles to chunks
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// of text such as bolding.
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// Example:
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// builder.PushStyle(normal_style);
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// builder.AddText("Hello this is normal. ");
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//
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// builder.PushStyle(bold_style);
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// builder.AddText("And this is BOLD. ");
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//
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// builder.Pop();
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// builder.AddText(" Back to normal again.");
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virtual void pop() = 0;
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virtual TextStyle peekStyle() = 0;
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// Adds text to the builder. Forms the proper runs to use the upper-most style
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// on the style_stack
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virtual void addText(const std::u16string& text) = 0;
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// Adds text to the builder, using the top-most style on on the style_stack.
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virtual void addText(const char* text) = 0; // Don't use this one - going away soon
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virtual void addText(const char* text, size_t len) = 0;
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// Pushes the information required to leave an open space, where Flutter may
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// draw a custom placeholder into.
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// Internally, this method adds a single object replacement character (0xFFFC)
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virtual void addPlaceholder(const PlaceholderStyle& placeholderStyle) = 0;
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virtual void setParagraphStyle(const ParagraphStyle& style) = 0;
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// Constructs a SkParagraph object that can be used to layout and paint the text to a SkCanvas.
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virtual std::unique_ptr<Paragraph> Build() = 0;
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// Just until we fix all the google3 code
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static std::unique_ptr<ParagraphBuilder> make(const ParagraphStyle& style,
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sk_sp<FontCollection> fontCollection);
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};
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} // namespace textlayout
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} // namespace skia
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#endif // ParagraphBuilder_DEFINED
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