david
47aaf11578
git-svn-id: https://192.168.0.254/svn/Componentes.Terceros.DevExpressVCL@38 05c56307-c608-d34a-929d-697000501d7a
408 lines
12 KiB
ObjectPascal
408 lines
12 KiB
ObjectPascal
{*******************************************************************}
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{ }
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{ ExpressWeb Framework by Developer Express }
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{ Text Metrics Utils }
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{ }
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{ Copyright (c) 2000-2009 Developer Express Inc. }
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{ ALL RIGHTS RESERVED }
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{ }
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{ The entire contents of this file is protected by U.S. and }
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{ International Copyright Laws. Unauthorized reproduction, }
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{ reverse-engineering, and distribution of all or any portion of }
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{ the code contained in this file is strictly prohibited and may }
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{ result in severe civil and criminal penalties and will be }
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{ prosecuted to the maximum extent possible under the law. }
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{ }
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{ RESTRICTIONS }
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{ }
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{ THIS SOURCE CODE AND ALL RESULTING INTERMEDIATE FILES }
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{ (DCU, OBJ, DLL, ETC.) ARE CONFIDENTIAL AND PROPRIETARY TRADE }
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{ SECRETS OF DEVELOPER EXPRESS INC. THE REGISTERED DEVELOPER IS }
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{ LICENSED TO DISTRIBUTE THE EXPRESSWEB FRAMEWORK AND ALL }
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{ ACCOMPANYING VCL CLASSES AS PART OF AN EXECUTABLE WEB }
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{ APPLICATION ONLY. }
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{ }
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{ THE SOURCE CODE CONTAINED WITHIN THIS FILE AND ALL RELATED }
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{ FILES OR ANY PORTION OF ITS CONTENTS SHALL AT NO TIME BE }
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{ COPIED, TRANSFERRED, SOLD, DISTRIBUTED, OR OTHERWISE MADE }
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{ AVAILABLE TO OTHER INDIVIDUALS WITHOUT EXPRESS WRITTEN CONSENT }
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{ AND PERMISSION FROM DEVELOPER EXPRESS INC. }
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{ }
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{ CONSULT THE END USER LICENSE AGREEMENT FOR INFORMATION ON }
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{ ADDITIONAL RESTRICTIONS. }
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{ }
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{*******************************************************************}
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unit cxWebMetrics;
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{$I cxVer.inc}
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interface
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uses
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Classes, SysUtils,
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{$IFDEF VCL}
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Windows, Graphics, Jpeg,
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{$ELSE}
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Types, Qt, QGraphics,
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{$ENDIF}
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cxWebUtils, cxWebTypes, cxWebGraphics;
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type
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TcxWebMetricsUtils = class(TcxAbstractWebMetricsUtils)
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private
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FPixelsPerInch: Integer;
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FCheckWidth, FCheckHeight: Integer;
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procedure GetCheckSize;
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procedure GetPixelsPerInch;
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function GetFontSizeInPoints(AFontSize: TcxWebFontSize): Integer;
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function GetTextSize(const AText: string; AWebFont: TcxWebFont): TSize;
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protected
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function GetCheckWidth: Integer; override;
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function GetCheckHeight: Integer; override;
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function WebFontToFont(AWebFont: TcxWebFont): {$IFDEF VCL}HFONT{$ELSE}QFontH{$ENDIF};
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public
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constructor Create;
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function CalcEditHeight(AFont: TcxWebFont): Integer; override;
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function GetAweCharWidth(AWebFont: TcxWebFont): Integer; override;
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function GetTextHeight(const AText: string; AWebFont: TcxWebFont): Integer; override;
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function GetTextWidth(const AText: string; AWebFont: TcxWebFont): Integer; override;
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end;
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TcxWebImageUtils = class(TcxAbstractWebImageUtils)
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private
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FPicture: TPicture;
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FErrMessage: string;
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protected
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function GetGraphic: TGraphic;
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public
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constructor Create; override;
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destructor Destroy; override;
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function GetErrMessage: string; override;
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function GetHeight: Integer; override;
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function GetWidth: Integer; override;
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function IsEmpty: Boolean; override;
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procedure SetPath(const APath: string); override;
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procedure SetImage(Value: Variant); override;
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end;
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implementation
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uses Variants, cxWebDataUtils, Consts;
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{ TcxWebMetricsUtils }
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constructor TcxWebMetricsUtils.Create;
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begin
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inherited;
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GetCheckSize;
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GetPixelsPerInch;
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end;
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procedure TcxWebMetricsUtils.GetPixelsPerInch;
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{$IFDEF VCL}
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var
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DC: HDC;
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begin
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DC := GetDC(0);
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FPixelsPerInch := GetDeviceCaps(DC, LOGPIXELSY);
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ReleaseDC(0, DC);
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{$ELSE}
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var
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Metrics: QPaintDeviceMetricsH;
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begin
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Metrics := QPaintDeviceMetrics_create(QWidget_to_QPaintDevice(QApplication_desktop));
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FPixelsPerInch := QPaintDeviceMetrics_logicalDpiY(Metrics);
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QPaintDeviceMetrics_destroy(Metrics);
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{$ENDIF}
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end;
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function TcxWebMetricsUtils.GetFontSizeInPoints(AFontSize: TcxWebFontSize): Integer;
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begin
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case AFontSize.Units of
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wuPixels:
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Result := MulDiv(AFontSize.Value, 72, FPixelsPerInch); // 1 pt = 1/72 in
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wuPicas:
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Result := MulDiv(AFontSize.Value, 6, FPixelsPerInch); // 1 pc = 12 pt = 1/6 in
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wuMillimeters:
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Result := MulDiv(AFontSize.Value * 10, 72, 254); // 1 in = 25.4 mm
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wuCentimeters:
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Result := MulDiv(AFontSize.Value * 100, 72, 254); // 1 in = 2.54 cm
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wuInches:
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Result := 72 * AFontSize.Value;
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// wuEm: TODO: it is equal to the font size of the parent element
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// wuEx: TODO: it is equal to the height of the lowercase "x".
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// wuPercentage: TODO: it is rate of the font size of the parent element
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else {in points}
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Result := AFontSize.Value;
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end;
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end;
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function TcxWebMetricsUtils.WebFontToFont(AWebFont: TcxWebFont): {$IFDEF VCL}HFONT{$ELSE}QFontH{$ENDIF};
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{$IFDEF VCL}
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var
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LogFont: TLogFont;
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begin
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FillChar(LogFont, SizeOf(TLogFont), 0);
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with LogFont do
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begin
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lfHeight := -MulDiv(GetFontSizeInPoints(AWebFont.Size), FPixelsPerInch, 72);
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lfWidth := 0;
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lfEscapement := 0;
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lfOrientation := 0;
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if AWebFont.Bold then
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lfWeight := FW_BOLD
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else
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lfWeight := FW_NORMAL;
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lfItalic := Byte(AWebFont.Italic);
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lfUnderline := Byte(AWebFont.Underline);
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lfStrikeOut := Byte(AWebFont.Strikeout);
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lfCharSet := DEFAULT_CHARSET;//Byte(Font.Charset);
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lfOutPrecision := OUT_DEFAULT_PRECIS;
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lfClipPrecision := CLIP_DEFAULT_PRECIS;
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lfQuality := DEFAULT_QUALITY;
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lfPitchAndFamily := DEFAULT_PITCH;
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StrPCopy(lfFaceName, AWebFont.Name);
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end;
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Result := CreateFontIndirect(LogFont);
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{$ELSE}
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var
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AFontName: WideString;
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begin
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Result := QFont_Create();
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AFontName := AWebFont.Name;
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QFont_setFamily(Result, @AFontName);
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QFont_setPixelSize(Result, GetFontSizeInPoints(AWebFont.Size));
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QFont_setBold(Result, AWebFont.Bold);
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QFont_setItalic(Result, AWebFont.Italic);
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QFont_setStrikeOut(Result, AWebFont.StrikeOut);
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QFont_setUnderline(Result, AWebFont.Underline);
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{$ENDIF}
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end;
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function TcxWebMetricsUtils.GetAweCharWidth(AWebFont: TcxWebFont): Integer;
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{$IFDEF VCL}
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var
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DC: HDC;
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PrevFont: HFONT;
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TM: TTextMetric;
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begin
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DC := GetDC(0);
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PrevFont := SelectObject(DC, WebFontToFont(AWebFont));
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GetTextMetrics(DC, TM);
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Result := TM.tmAveCharWidth;
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DeleteObject(SelectObject(DC, PrevFont));
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ReleaseDC(0, DC);
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{$ELSE}
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var
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AFont: QFontH;
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AFontMetrics: QFontMetricsH;
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begin
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AFont := WebFontToFont(AWebFont);
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AFontMetrics := QFontMetrics_Create(AFont);
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Result:= QFontMetrics_maxWidth(AFontMetrics);
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QFontMetrics_Destroy(AFontMetrics);
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QFont_Destroy(AFont);
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{$ENDIF}
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end;
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procedure TcxWebMetricsUtils.GetCheckSize;
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{$IFDEF VCL}
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const
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OBM_CHECKBOXES = 32759;
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begin
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with TBitmap.Create do
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try
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Handle := LoadBitmap(0, PChar(OBM_CHECKBOXES));
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FCheckWidth := Width div 4;
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FCheckHeight := Height div 3;
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finally
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Free;
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end;
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{$ELSE}
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var
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ChSize: TSize;
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begin
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QStyle_indicatorSize(QApplication_style, @ChSize);
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if (ChSize.cx <> 0) and (ChSize.cy <> 0) then
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begin
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FCheckWidth := ChSize.cx;
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FCheckHeight := ChSize.cy;
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end
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else
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begin
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FCheckWidth := 13;
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FCheckHeight := 13;
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end;
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{$ENDIF}
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end;
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function TcxWebMetricsUtils.GetTextSize(const AText: string; AWebFont: TcxWebFont): TSize;
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{$IFDEF VCL}
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var
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DC: HDC;
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PrevFont: HFONT;
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begin
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DC := GetDC(0);
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PrevFont := SelectObject(DC, WebFontToFont(AWebFont));
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GetTextExtentPoint32(DC, PChar(AText), Length(AText), Result);
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DeleteObject(SelectObject(DC, PrevFont));
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ReleaseDC(0, DC);
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{$ELSE}
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var
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AFont: QFontH;
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AFontMetrics: QFontMetricsH;
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AWideText: WideString;
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begin
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AFont := WebFontToFont(AWebFont);
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AFontMetrics := QFontMetrics_Create(AFont);
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Result.cy := QFontMetrics_height(AFontMetrics);
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AWideText := AText;
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Result.cx := QFontMetrics_width(AFontMetrics, @AWideText, Length(AText));
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QFontMetrics_Destroy(AFontMetrics);
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QFont_Destroy(AFont);
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{$ENDIF}
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end;
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function TcxWebMetricsUtils.GetCheckWidth: Integer;
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begin
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Result := FCheckWidth;
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end;
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function TcxWebMetricsUtils.GetCheckHeight: Integer;
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begin
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Result := FCheckHeight;
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end;
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function TcxWebMetricsUtils.GetTextHeight(const AText: string; AWebFont: TcxWebFont): Integer;
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begin
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Result := GetTextSize(AText, AWebFont).cy;
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end;
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function TcxWebMetricsUtils.GetTextWidth(const AText: string; AWebFont: TcxWebFont): Integer;
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begin
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Result := GetTextSize(AText, AWebFont).cx;
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end;
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function TcxWebMetricsUtils.CalcEditHeight(AFont: TcxWebFont): Integer;
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{$IFDEF VCL}
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var
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DC: HDC;
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PrevFont: HFont;
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Metrics: TTextMetric;
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begin
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DC := GetDC(0);
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PrevFont := SelectObject(DC, WebFontToFont(AFont));
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GetTextMetrics(DC, Metrics);
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DeleteObject(SelectObject(DC, PrevFont));
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ReleaseDC(0, DC);
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Result := Metrics.tmHeight + 2 * GetSystemMetrics(SM_CYBORDER);
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{$ELSE}
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begin
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Result := 2 + GetTextHeight('Wq', AFont) + 2;
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{$ENDIF}
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end;
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{ TcxWebImageUtils }
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constructor TcxWebImageUtils.Create;
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begin
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FPicture := TPicture.Create;
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FErrMessage := '';
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end;
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destructor TcxWebImageUtils.Destroy;
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begin
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FPicture.Free;
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inherited;
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end;
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function TcxWebImageUtils.GetErrMessage: string;
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begin
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Result := FErrMessage;
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end;
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function TcxWebImageUtils.GetHeight: Integer;
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begin
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Result := FPicture.Height;
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end;
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function TcxWebImageUtils.GetWidth: Integer;
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begin
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Result := FPicture.Width;
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end;
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function TcxWebImageUtils.IsEmpty: Boolean;
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begin
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Result := (FPicture.Graphic = nil) or FPicture.Graphic.Empty;
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end;
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procedure TcxWebImageUtils.SetPath(const APath: string);
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var
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Ext: string;
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begin
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if APath = '' then
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begin
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FPicture.Graphic := nil;
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FErrMessage := '';
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end
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else
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try
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Ext := ExtractFileExt(APath);
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Delete(Ext, 1, 1);
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if Ext = '' then
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raise EInvalidGraphic.CreateFmt(SUnknownExtension, [Ext]);
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FPicture.LoadFromFile(APath);
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FErrMessage := '';
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except
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on E: Exception do
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begin
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FPicture.Graphic := nil;
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FErrMessage := 'DESIGNER WARNING:' + #13#10 + E.Message + #13#10 + 'Image may be missing or displayed incorrectly.';
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end;
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end;
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end;
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procedure TcxWebImageUtils.SetImage(Value: Variant);
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var
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AStream: TStream;
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AHeight, AWidth: Integer;
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NewGraphic: TGraphic;
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begin
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if VarIsType(Value, [varEmpty, VarNull]) then Exit;
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{$IFDEF VCL}
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NewGraphic := TJPEGImage.Create;
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{$ELSE}
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NewGraphic := TBitmap.Create;
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{$ENDIF}
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try
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AStream := TMemoryStream.Create;
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LoadPicture(AStream, {$IFDEF VCL}nil,{$ENDIF} Value, AHeight, AWidth);
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try
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AStream.Position := 0;
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NewGraphic.LoadFromStream(AStream);
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FPicture.Graphic := NewGraphic;
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finally
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AStream.Free;
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end;
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finally
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NewGraphic.Free;
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end;
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end;
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function TcxWebImageUtils.GetGraphic: TGraphic;
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begin
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Result := FPicture.Graphic;
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end;
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initialization
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if Assigned(cxWebMetricsUtils) then
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cxWebMetricsUtils.Free;
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cxWebMetricsUtils := TcxWebMetricsUtils.Create;
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cxWebImageUtilsClass := TcxWebImageUtils;
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finalization
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FreeAndNil(cxWebMetricsUtils);
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cxWebImageUtilsClass := nil;
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end.
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