rainmeter-studio/Common/Gfx/TextFormatD2D.h

81 lines
2.5 KiB
C++

/*
Copyright (C) 2013 Birunthan Mohanathas
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef RM_GFX_TEXTFORMATD2D_H_
#define RM_GFX_TEXTFORMATD2D_H_
#include "TextFormat.h"
#include <string>
#include <dwrite_1.h>
#include <wrl/client.h>
namespace Gfx {
// Provides a Direct2D/DirectWrite implementation of TextFormat for use with CanvasD2D.
class TextFormatD2D : public TextFormat
{
public:
TextFormatD2D();
virtual ~TextFormatD2D();
TextFormatD2D(const TextFormatD2D& other) = delete;
TextFormatD2D& operator=(TextFormatD2D other) = delete;
virtual bool IsInitialized() const override { return m_TextFormat != nullptr; }
virtual void SetProperties(
const WCHAR* fontFamily, int size, bool bold, bool italic,
const FontCollection* fontCollection) override;
virtual void SetTrimming(bool trim) override;
virtual void SetHorizontalAlignment(HorizontalAlignment alignment) override;
virtual void SetVerticalAlignment(VerticalAlignment alignment) override;
private:
friend class CanvasD2D;
friend class Common_Gfx_TextFormatD2D_Test;
void Dispose();
// Creates a new DirectWrite text layout if |str| has changed since last call. Since creating
// the layout is costly, it is more efficient to keep reusing the text layout until the text
// changes. Returns true if the layout is valid for use.
bool CreateLayout(const WCHAR* str, UINT strLen, float maxW, float maxH, bool gdiEmulation);
DWRITE_TEXT_METRICS GetMetrics(
const WCHAR* str, UINT strLen, bool gdiEmulation, float maxWidth = 10000.0f);
Microsoft::WRL::ComPtr<IDWriteTextFormat> m_TextFormat;
Microsoft::WRL::ComPtr<IDWriteTextLayout> m_TextLayout;
Microsoft::WRL::ComPtr<IDWriteInlineObject> m_InlineEllipsis;
std::wstring m_LastString;
// Used to emulate GDI+ behaviour.
float m_ExtraHeight;
float m_LineGap;
// Contains the value passed to the last call of of SetTrimming().
bool m_Trimming;
};
} // namespace Gfx
#endif