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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_WIN_TEXT_ANALYSIS_SOURCE_H_
#define UI_GFX_WIN_TEXT_ANALYSIS_SOURCE_H_
#include <dwrite.h>
#include <wrl.h>
#include "base/macros.h"
#include "base/strings/string16.h"
#include "ui/gfx/gfx_export.h"
namespace gfx {
namespace win {
// Implements an IDWriteTextAnalysisSource, describing a single pre-defined
// chunk of text with a uniform locale, reading direction, and number
// substitution.
class TextAnalysisSource
: public Microsoft::WRL::RuntimeClass<
Microsoft::WRL::RuntimeClassFlags<Microsoft::WRL::ClassicCom>,
IDWriteTextAnalysisSource> {
public:
// Factory method to avoid exporting the class and all it derives from.
static GFX_EXPORT HRESULT
Create(IDWriteTextAnalysisSource** text_analysis_out,
const base::string16& text,
const base::string16& locale_name,
IDWriteNumberSubstitution* number_substitution,
DWRITE_READING_DIRECTION reading_direction);
// Use Create() to construct these objects. Direct calls to the constructor
// are an error - it is only public because a WRL helper function creates the
// objects.
TextAnalysisSource();
// IDWriteTextAnalysisSource:
HRESULT STDMETHODCALLTYPE GetLocaleName(UINT32 text_position,
UINT32* text_length,
const WCHAR** locale_name) override;
HRESULT STDMETHODCALLTYPE GetNumberSubstitution(
UINT32 text_position,
UINT32* text_length,
IDWriteNumberSubstitution** number_substitution) override;
DWRITE_READING_DIRECTION STDMETHODCALLTYPE
GetParagraphReadingDirection() override;
HRESULT STDMETHODCALLTYPE GetTextAtPosition(UINT32 text_position,
const WCHAR** text_string,
UINT32* text_length) override;
HRESULT STDMETHODCALLTYPE GetTextBeforePosition(UINT32 text_position,
const WCHAR** text_string,
UINT32* text_length) override;
HRESULT STDMETHODCALLTYPE
RuntimeClassInitialize(const base::string16& text,
const base::string16& locale_name,
IDWriteNumberSubstitution* number_substitution,
DWRITE_READING_DIRECTION reading_direction);
protected:
~TextAnalysisSource() override;
private:
base::string16 text_;
base::string16 locale_name_;
Microsoft::WRL::ComPtr<IDWriteNumberSubstitution> number_substitution_;
DWRITE_READING_DIRECTION reading_direction_;
DISALLOW_ASSIGN(TextAnalysisSource);
};
} // namespace win
} // namespace gfx
#endif // UI_GFX_WIN_TEXT_ANALYSIS_SOURCE_H_
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