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bgrasvgtype.pas
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bgrasvgtype.pas
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// SPDX-License-Identifier: LGPL-3.0-linking-exception
{ Base type definitions and implementation for SVG }
unit BGRASVGType;
{$mode objfpc}{$H+}
{$MODESWITCH ADVANCEDRECORDS}
interface
uses
BGRAClasses, SysUtils, BGRATransform, BGRABitmapTypes, BGRAUnits,
DOM, BGRACanvas2D, fgl, BGRAGraphics;
type
ArrayOfFloat = array of single;
ArrayOfString = array of string;
TSVGElement = class;
TSVGElementList = specialize TFPGList<TSVGElement>;
TSVGElementDictionary = specialize TFPGMap<string,TSVGElement>;
TSVGFactory = class of TSVGElement;
TIterateElementCallback = procedure(AElement: TSVGElement; AData: pointer; var ARecursive: boolean) of object;
TSVGFillMode = (
sfmEvenOdd = Ord(fmAlternate),
sfmNonZero = Ord(fmWinding)
);
TSVGPaintOrder = (
spoFillStrokeMarkers,
spoFillMarkersStroke,
spoStrokeFillMarkers,
spoStrokeMarkersFill,
spoMarkersFillStroke,
spoMarkersStrokeFill
);
TSVGLengthAdjust = (
slaSpacing,
slaSpacingAndGlyphs
);
TSVGTextPathMethod = (
stpmAlign,
stpmStretch
);
TSVGTextPathSpacing = (
stpsAuto,
stpsExact
);
TSVGTextAnchor = (
staStart,
staMiddle,
staEnd
);
TSVGTextDirection = (
stdLtr,
stdRtl
);
TSVGObjectUnits = (
souUserSpaceOnUse,
souObjectBoundingBox
);
TSVGSpreadMethod = (
ssmPad,
ssmReflect,
ssmRepeat
);
TSVGColorInterpolation = (
sciStdRGB,
sciLinearRGB
);
TSVGImageRendering = (
sirAuto,
sirSmooth,
sirHighQuality,
sirCrispEdges,
sirPixelated
);
TSVGRenderingIntent = (
sriAuto,
sriPerceptual,
sriRelativeColorimetric,
sriSaturation,
sriAbsoluteColorimetric
);
TSVGMarkerUnits = (
smuStrokeWidth,
smuUserSpaceOnUse
);
TSVGOrientAuto = (soaNone,soaAuto,soaAutoReverse);
{ Orientation to use for a marker relative to path }
TSVGOrient = record
auto: TSVGOrientAuto;
angle: TSVGNumber;
end;
TFindStyleState = (fssNotSearched,
fssNotFound,
fssFound);
{ One or more CSS attributes }
TStyleAttribute = record
attr : string;
pos : integer;
end;
ArrayOfTStyleAttribute = array of TStyleAttribute;
{ SVG bounding box for coordinates }
TSVGViewBox = record
min, size: TPointF;
function ToString: string;
class function Parse(AValue: string): TSVGViewBox; static;
class function DefaultValue: TSVGViewBox; static;
end;
{ Size defined in CSS units }
TSVGSize = record
width, height: TFloatWithCSSUnit;
end;
{ SVG parameter to specify aspect ratio and alignment }
TSVGPreserveAspectRatio = record
Preserve, Slice: boolean;
HorizAlign: TAlignment;
VertAlign: TTextLayout;
function ToString: string;
class function Parse(AValue: string): TSVGPreserveAspectRatio; static;
class function DefaultValue: TSVGPreserveAspectRatio; static;
end;
TSVGRecomputeEvent = procedure(Sender: TObject) of object;
TSVGLinkEvent = procedure(Sender: TObject; AElement: TSVGElement; ALink: boolean) of object;
{ Listeners on link changes between SVG elements }
TSVGLinkListeners = class(specialize TFPGList<TSVGLinkEvent>)
{$IF FPC_FULLVERSION >= 30301}
private
type PT = ^TSVGLinkEvent;
public
{$ENDIF}
function IndexOf(const Item: TSVGLinkEvent): Integer;
function Remove(const Item: TSVGLinkEvent): Integer;
end;
{ Class to listen to link changes between SVG elements }
TSVGDataLink = class
private
FElements: TSVGElementDictionary;
FStyles: TSVGElementList;
FParent: TSVGDataLink;
FChildren: TList;
FLinkListeners: TSVGLinkListeners;
function GetElement(AIndex: integer): TSVGElement;
function GetStyle(AIndex: integer): TSVGElement;
function IsValidIndex(const AIndex: integer; list: TSVGElementList): boolean;
function FindTo(el: TSVGElement; list: TSVGElementList): integer;
procedure NotifyLink(AElement: TSVGElement; ALink: boolean);
procedure SetParent(AValue: TSVGDataLink);
public
constructor Create(AParent: TSVGDataLink);
destructor Destroy; override;
function ElementCount: integer;
function StyleCount: integer;
function FindElement(el: TSVGElement): integer;
function FindElementById(AID: string; AClass: TSVGFactory): TSVGElement;
function FindElementByRef(ARef: string; AClass: TSVGFactory): TSVGElement;
function FindElementByRef(ARef: string; ANeedUrl: boolean; AClass: TSVGFactory; out ANotFound: boolean): TSVGElement;
function FindStyle(el: TSVGElement): integer;
function IsLinkElement(el: TSVGElement): boolean;
function IsLinkStyle(el: TSVGElement): boolean;
function IsLink(el: TSVGElement): boolean;
function Link(el: TSVGElement): integer;
procedure Unlink(el: TSVGElement);
procedure UnlinkAll;
procedure RegisterLinkListener(AHandler: TSVGLinkEvent; ARegister: boolean);
property Styles[ID: integer]: TSVGElement read GetStyle;
property Elements[AIndex: integer]: TSVGElement read GetElement;
property Parent: TSVGDataLink read FParent write SetParent;
end;
{ Abstract SVG element }
TSVGCustomElement = class
protected
FDomElem: TDOMElement;
FUnits: TCSSUnitConverter;
function GetDOMElement: TDOMElement; virtual;
function GetAttributeFromElement(ANode: TDOMElement; AName: string; ACanInherit: boolean): string;
function GetAttribute(AName: string; ADefault: string; ACanInherit: boolean): string; overload;
function GetAttribute(AName: string; ADefault: string): string; overload;
function GetAttribute(AName: string): string; overload;
function GetAttributeNumber(AName: string; ADefault: TSVGNumber): TSVGNumber; overload;
function GetArrayOfAttributeNumber(AName: string): ArrayOfTSVGNumber;
function GetArrayOfAttributeNumber(AName: string; ACanInherit: boolean): ArrayOfTSVGNumber;
function GetAttributeWithUnit(AName: string; ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit; overload;
function GetAttributeWithUnit(AName: string): TFloatWithCSSUnit; overload;
function GetArrayOfAttributeWithUnit(AName: string; ACanInherit: boolean): ArrayOfTFloatWithCSSUnit;
function GetArrayOfAttributeWithUnit(AName: string): ArrayOfTFloatWithCSSUnit;
function GetHorizAttribute(AName: string; ADefault: TSVGNumber): TSVGNumber;
function GetHorizAttribute(AName: string): TSVGNumber;
function GetHorizAttributeWithUnit(AName: string;
ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit;
function GetHorizAttributeWithUnit(AName: string): TFloatWithCSSUnit;
function GetArrayOfHorizAttributeWithUnit(AName: string;
ACanInherit: boolean): ArrayOfTFloatWithCSSUnit;
function GetArrayOfHorizAttributeWithUnit(AName: string): ArrayOfTFloatWithCSSUnit;
function GetVerticalAttribute(AName: string; ADefault: TSVGNumber): TSVGNumber;
function GetVerticalAttribute(AName: string): TSVGNumber;
function GetVerticalAttributeWithUnit(AName: string;
ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit;
function GetVerticalAttributeWithUnit(AName: string): TFloatWithCSSUnit;
function GetArrayOfVerticalAttributeWithUnit(AName: string): ArrayOfTFloatWithCSSUnit;
function GetArrayOfVerticalAttributeWithUnit(AName: string; ACanInherit: boolean): ArrayOfTFloatWithCSSUnit;
function GetOrthoAttributeWithUnit(AName: string;
ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit;
function GetOrthoAttributeWithUnit(AName: string): TFloatWithCSSUnit;
function GetArrayOfOrthoAttributeWithUnit(AName: string): ArrayOfTFloatWithCSSUnit;
function GetArrayOfOrthoAttributeWithUnit(AName: string; ACanInherit: boolean): ArrayOfTFloatWithCSSUnit;
function GetAttributeOrStyle(AName,ADefault: string; ACanInherit: boolean): string; overload;
function GetAttributeOrStyle(AName,ADefault: string): string; overload;
function GetAttributeOrStyle(AName: string): string; overload;
function GetHorizAttributeOrStyleWithUnit(AName: string; ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit;
function GetArrayOfHorizAttributeOrStyleWithUnit(AName: string): ArrayOfTFloatWithCSSUnit;
function GetOrthoAttributeOrStyleWithUnit(AName: string; ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit;
function GetArrayOfOrthoAttributeOrStyleWithUnit(AName: string): ArrayOfTFloatWithCSSUnit;
function GetAttributeOrStyleWithUnit(AName: string; ADefault: TFloatWithCSSUnit; ACanInherit: boolean): TFloatWithCSSUnit; overload;
function GetAttributeOrStyleWithUnit(AName: string; ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit; overload;
function GetAttributeOrStyleWithUnit(AName: string): TFloatWithCSSUnit; overload;
function GetArrayOfAttributeOrStyleWithUnit(AName: string): ArrayOfTFloatWithCSSUnit;
function GetVerticalAttributeOrStyleWithUnit(AName: string; ADefault: TFloatWithCSSUnit; ACanInherit: boolean): TFloatWithCSSUnit; overload;
function GetVerticalAttributeOrStyleWithUnit(AName: string; ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit; overload;
function GetArrayOfVerticalAttributeOrStyleWithUnit(AName: string): ArrayOfTFloatWithCSSUnit;
function GetNamespaceCount: integer;
function GetNamespacePrefix(AIndex: integer): string;
function GetNamespaceURI(APrefix: string): string;
class function GetPropertyFromStyleDeclarationBlock(ABlock: string;
AProperty: string; ADefault: string): string;
class procedure LocateStyleDeclaration(AText: string; AProperty: string;
out AStartPos, AColonPos, AValueLength: integer);
class procedure UpdateStyleDeclarationBlock(var ABlock: string; AProperty: string; AValue: string);
class function RemovePropertyFromDeclarationBlock(var ABlock: string; AProperty: string): boolean;
function GetInlineStyle(const AName,ADefault: string): string;
function GetInlineStyleWithUnit(const AName: string): TFloatWithCSSUnit; overload;
function GetInlineStyleWithUnit(const AName: string; ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit; overload;
function GetStyleFromStyleSheet(const {%H-}AName,ADefault: string): string; virtual;
function GetStyle(const AName,ADefault: string): string; overload;
function GetStyle(const AName: string): string; overload;
procedure SetAttribute(AName: string; AValue: TSVGNumber); virtual; overload;
procedure SetAttribute(AName: string; AValue: string); virtual; overload;
procedure SetAttributeWithUnit(AName: string; AValue: TFloatWithCSSUnit);
procedure SetArrayOfAttributeWithUnit(AName: string; const AValue: ArrayOfTFloatWithCSSUnit);
procedure SetHorizAttribute(AName: string; AValue: TSVGNumber);
procedure SetHorizAttributeWithUnit(AName: string; AValue: TFloatWithCSSUnit);
procedure SetArrayOfHorizAttributeWithUnit(AName: string;
AValue: ArrayOfTFloatWithCSSUnit);
procedure SetVerticalAttribute(AName: string; AValue: TSVGNumber);
procedure SetArrayOfAttributeNumber(AName: string; AValue: ArrayOfTSVGNumber);
procedure SetVerticalAttributeWithUnit(AName: string; AValue: TFloatWithCSSUnit);
procedure SetArrayOfVerticalAttributeWithUnit(AName: string; AValue: ArrayOfTFloatWithCSSUnit);
procedure SetOrthoAttributeWithUnit(AName: string; AValue: TFloatWithCSSUnit);
procedure SetArrayOfOrthoAttributeWithUnit(AName: string; AValue: ArrayOfTFloatWithCSSUnit);
procedure SetNamespaceURI(APrefix: string; AValue: string);
procedure SetInlineStyle(AName: string; AValue: string); overload;
procedure SetInlineStyle(AName: string; AValue: TFloatWithCSSUnit); overload;
public
procedure RemoveStyle(const AName: string);
function HasAttribute(AName: string): boolean;
function HasInlineStyle(AName: string): boolean;
procedure IterateElements(ACallback: TIterateElementCallback; AData: pointer; ARecursive: boolean); virtual;
procedure ConvertToUnit(AUnit: TCSSUnit); virtual;
function EnterFontSize(AIsRoot: boolean = false): TFloatWithCSSUnit; virtual;
procedure ExitFontSize(APrevFontSize: TFloatWithCSSUnit); virtual;
function MatrixToTransform(m: TAffineMatrix; AFromUnit: TCSSUnit): string;
function TransformToMatrix(ATransform: string; AToUnit: TCSSUnit): TAffineMatrix;
procedure RemoveNamespace(APrefix: string);
function NeedNamespace(APrefix: string): boolean;
property NamespaceURI[APrefix: string]: string read GetNamespaceURI write SetNamespaceURI;
property NamespacePrefix[AIndex: integer]: string read GetNamespacePrefix;
property NamespaceCount: integer read GetNamespaceCount;
property Style[AName: string]: string read GetStyle write SetInlineStyle;
property StyleDef[AName,ADefault: string]: string read GetStyle;
end;
{ SVG element on any type }
TSVGElement = class(TSVGCustomElement)
private
FImportStyleState: TFindStyleState;
FImportedStyles: ArrayOfTStyleAttribute;
function GetClipPath: string;
function GetFill: string;
function GetFillColor: TBGRAPixel;
function GetFillOpacity: single;
function GetFillRule: string;
function GetIsFillNone: boolean;
function GetIsStrokeNone: boolean;
function GetMask: string;
function GetMatrix(AUnit: TCSSUnit): TAffineMatrix;
function GetMixBlendMode: TBlendOperation;
function GetOpacity: single;
function GetPaintOrder: TSVGPaintOrder;
function GetStroke: string;
function GetStrokeColor: TBGRAPixel;
function GetStrokeLineCap: string;
function GetStrokeLineCapLCL: TPenEndCap;
function GetStrokeLineJoin: string;
function GetStrokeLineJoinLCL: TPenJoinStyle;
function GetStrokeMiterLimit: single;
function GetStrokeOpacity: single;
function GetStrokeWidth: TFloatWithCSSUnit;
function GetStrokeDashArray: string;
function GetStrokeDashArrayF: ArrayOfFloat;
function GetStrokeDashOffset: TFloatWithCSSUnit;
function GetTransform: string;
function GetID: string;
function GetClassAttr: string;
function GetVisible: boolean;
procedure SetClipPath(AValue: string);
procedure SetFillColor(AValue: TBGRAPixel);
procedure SetFillOpacity(AValue: single);
procedure SetFillRule(AValue: string);
procedure SetMask(AValue: string);
procedure SetMatrix(AUnit: TCSSUnit; const AValue: TAffineMatrix);
procedure SetMixBlendMode(AValue: TBlendOperation);
procedure SetOpacity(AValue: single);
procedure SetPaintOrder(AValue: TSVGPaintOrder);
procedure SetStrokeColor(AValue: TBGRAPixel);
procedure SetStrokeLineCap(AValue: string);
procedure SetStrokeLineCapLCL(AValue: TPenEndCap);
procedure SetStrokeLineJoin(AValue: string);
procedure SetStrokeLineJoinLCL(AValue: TPenJoinStyle);
procedure SetStrokeMiterLimit(AValue: single);
procedure SetStrokeOpacity(AValue: single);
procedure SetStrokeWidth(AValue: TFloatWithCSSUnit);
procedure SetStrokeDashArray(AValue: string);
procedure SetStrokeDashArrayF(AValue: ArrayOfFloat);
procedure SetStrokeDashOffset(AValue: TFloatWithCSSUnit);
procedure SetTransform(AValue: string);
procedure SetID(AValue: string);
procedure SetClassAttr(AValue: string);
function FindStyleElementInternal(const classStr: string;
out attributesStr: string): integer;
procedure ImportStyles;
procedure SetVisible(AValue: boolean);
protected
FDataLink: TSVGDataLink;
procedure Init(ADocument: TDOMDocument; ATag: string; AUnits: TCSSUnitConverter); overload;
procedure Init(AElement: TDOMElement; AUnits: TCSSUnitConverter); overload;
procedure InternalDraw({%H-}ACanvas2d: TBGRACanvas2D; {%H-}AUnit: TCSSUnit); virtual;
procedure InternalCopyPathTo({%H-}ACanvas2d: TBGRACanvas2D; {%H-}AUnit: TCSSUnit); virtual;
function GetStyleFromStyleSheet(const AName,ADefault: string): string; override;
procedure ApplyFillStyle(ACanvas2D: TBGRACanvas2D; {%H-}AUnit: TCSSUnit); virtual;
procedure ApplyStrokeStyle(ACanvas2D: TBGRACanvas2D; AUnit: TCSSUnit); virtual;
procedure SetDatalink(AValue: TSVGDataLink); virtual;
procedure SetFill(AValue: string); virtual;
procedure SetStroke(AValue: string); virtual;
procedure Initialize; virtual;
procedure Paint(ACanvas2d: TBGRACanvas2D; AUnit: TCSSUnit);
public
constructor Create(AElement: TDOMElement; AUnits: TCSSUnitConverter; ADataLink: TSVGDataLink); overload; virtual;
constructor Create(ADocument: TDOMDocument; AUnits: TCSSUnitConverter; ADataLink: TSVGDataLink); overload; virtual;
class function GetDOMTag: string; virtual;
destructor Destroy; override;
procedure ListIdentifiers(AResult: TStringList); virtual;
procedure RenameIdentifiers(AFrom, ATo: TStringList); virtual;
procedure ConvertToUnit(AUnit: TCSSUnit); override;
procedure Recompute; virtual;
procedure Draw({%H-}ACanvas2d: TBGRACanvas2D; {%H-}AUnit: TCSSUnit);
procedure CopyPathTo({%H-}ACanvas2d: TBGRACanvas2D; {%H-}AUnit: TCSSUnit);
procedure fillNone;
procedure strokeNone;
procedure strokeDashArrayNone;
procedure transformNone;
function fillMode: TSVGFillMode;
property DataLink: TSVGDataLink read FDataLink write SetDataLink;
property DOMElement: TDOMElement read GetDOMElement;
property Units: TCSSUnitConverter read FUnits;
property ID: string read GetID write SetID;
property classAttr: string read GetClassAttr write SetClassAttr;
property transform: string read GetTransform write SetTransform;
property matrix[AUnit: TCSSUnit]: TAffineMatrix read GetMatrix write SetMatrix;
property isFillNone: boolean read GetIsFillNone;
property isStrokeNone: boolean read GetIsStrokeNone;
property stroke: string read GetStroke write SetStroke;
property strokeWidth: TFloatWithCSSUnit read GetStrokeWidth write SetStrokeWidth;
property strokeColor: TBGRAPixel read GetStrokeColor write SetStrokeColor;
property strokeOpacity: single read GetStrokeOpacity write SetStrokeOpacity;
property strokeMiterLimit: single read GetStrokeMiterLimit write SetStrokeMiterLimit;
property strokeLineJoin: string read GetStrokeLineJoin write SetStrokeLineJoin;
property strokeLineJoinLCL: TPenJoinStyle read GetStrokeLineJoinLCL write SetStrokeLineJoinLCL;
property strokeLineCap: string read GetStrokeLineCap write SetStrokeLineCap;
property strokeLineCapLCL: TPenEndCap read GetStrokeLineCapLCL write SetStrokeLineCapLCL;
property strokeDashArray: string read GetStrokeDashArray write SetStrokeDashArray;
property strokeDashArrayF: ArrayOfFloat read GetStrokeDashArrayF write SetStrokeDashArrayF;
property strokeDashOffset: TFloatWithCSSUnit read GetStrokeDashOffset write SetStrokeDashOffset;
property fill: string read GetFill write SetFill;
property fillColor: TBGRAPixel read GetFillColor write SetFillColor;
property fillOpacity: single read GetFillOpacity write SetFillOpacity;
property fillRule: string read GetFillRule write SetFillRule;
property paintOrder: TSVGPaintOrder read GetPaintOrder write SetPaintOrder;
property mixBlendMode: TBlendOperation read GetMixBlendMode write SetMixBlendMode;
property opacity: single read GetOpacity write SetOpacity;
property clipPath: string read GetClipPath write SetClipPath;
property mask: string read GetMask write SetMask;
property Visible: boolean read GetVisible write SetVisible;
property Attribute[AName: string]: string read GetAttribute write SetAttribute;
property AttributeDef[AName,ADefault: string]: string read GetAttribute;
property AttributeOrStyleDef[AName,ADefault: string]: string read GetAttributeOrStyle;
property AttributeOrStyle[AName: string]: string read GetAttributeOrStyle;
property AttributeWithUnitDef[AName: string; ADefault: TFloatWithCSSUnit]: TFloatWithCSSUnit read GetAttributeWithUnit;
property AttributeWithUnit[AName: string]: TFloatWithCSSUnit read GetAttributeWithUnit write SetAttributeWithUnit;
property ArrayOfAttributeWithUnitInherit[AName: string; ACanInherit: boolean]: ArrayOfTFloatWithCSSUnit read GetArrayOfAttributeWithUnit;
property ArrayOfAttributeWithUnit[AName: string]: ArrayOfTFloatWithCSSUnit read GetArrayOfAttributeWithUnit write SetArrayOfAttributeWithUnit;
property ArrayOfAttributeNumberInherit[AName: string; ACanInherit: boolean]: ArrayOfTSVGNumber read GetArrayOfAttributeNumber;
property ArrayOfAttributeNumber[AName: string]: ArrayOfTSVGNumber read GetArrayOfAttributeNumber write SetArrayOfAttributeNumber;
property HorizAttributeDef[AName: string; ADefault: TSVGNumber]: TSVGNumber read GetHorizAttribute;
property HorizAttribute[AName: string]: TSVGNumber read GetHorizAttribute write SetHorizAttribute;
property HorizAttributeWithUnitDef[AName: string; ADefault: TFloatWithCSSUnit]: TFloatWithCSSUnit read GetHorizAttributeWithUnit;
property HorizAttributeWithUnit[AName: string]: TFloatWithCSSUnit read GetHorizAttributeWithUnit write SetHorizAttributeWithUnit;
property HorizAttributeOrStyleWithUnit[AName: string; ADefault: TFloatWithCSSUnit]: TFloatWithCSSUnit read GetHorizAttributeOrStyleWithUnit;
property ArrayOfHorizAttributeWithUnitInherit[AName: string; ACanInherit: boolean]: ArrayOfTFloatWithCSSUnit read GetArrayOfHorizAttributeWithUnit;
property ArrayOfHorizAttributeWithUnit[AName: string]: ArrayOfTFloatWithCSSUnit read GetArrayOfHorizAttributeWithUnit write SetArrayOfHorizAttributeWithUnit;
property ArrayOfHorizAttributeOrStyleWithUnit[AName: string]: ArrayOfTFloatWithCSSUnit read GetArrayOfHorizAttributeOrStyleWithUnit;
property VerticalAttributeDef[AName: string; ADefault: TSVGNumber]: TSVGNumber read GetVerticalAttribute;
property VerticalAttribute[AName: string]: TSVGNumber read GetVerticalAttribute write SetVerticalAttribute;
property VerticalAttributeWithUnitDef[AName: string; ADefault: TFloatWithCSSUnit]: TFloatWithCSSUnit read GetVerticalAttributeWithUnit;
property VerticalAttributeWithUnit[AName: string]: TFloatWithCSSUnit read GetVerticalAttributeWithUnit write SetVerticalAttributeWithUnit;
property VerticalAttributeOrStyleWithUnit[AName: string; ADefault: TFloatWithCSSUnit]: TFloatWithCSSUnit read GetVerticalAttributeOrStyleWithUnit;
property ArrayOfVerticalAttributeWithUnitInherit[AName: string; ACanInherit: boolean]: ArrayOfTFloatWithCSSUnit read GetArrayOfVerticalAttributeWithUnit;
property ArrayOfVerticalAttributeWithUnit[AName: string]: ArrayOfTFloatWithCSSUnit read GetArrayOfVerticalAttributeWithUnit write SetArrayOfVerticalAttributeWithUnit;
property ArrayOfVerticalAttributeOrStyleWithUnit[AName: string]: ArrayOfTFloatWithCSSUnit read GetArrayOfVerticalAttributeOrStyleWithUnit;
property OrthoAttributeWithUnitDef[AName: string; ADefault: TFloatWithCSSUnit]: TFloatWithCSSUnit read GetOrthoAttributeWithUnit;
property OrthoAttributeWithUnit[AName: string]: TFloatWithCSSUnit read GetOrthoAttributeWithUnit write SetOrthoAttributeWithUnit;
property OrthoAttributeOrStyleWithUnit[AName: string; ADefault: TFloatWithCSSUnit]: TFloatWithCSSUnit read GetOrthoAttributeOrStyleWithUnit;
property ArrayOfOrthoAttributeWithUnit[AName: string]: ArrayOfTFloatWithCSSUnit read GetArrayOfOrthoAttributeWithUnit write SetArrayOfOrthoAttributeWithUnit;
property ArrayOfOrthoAttributeOrStyleWithUnit[AName: string]: ArrayOfTFloatWithCSSUnit read GetArrayOfOrthoAttributeOrStyleWithUnit;
end;
{ Parser for SVG attributes }
TSVGParser = class
private
function GetDone: boolean;
protected
FPos: integer;
FNumberError: boolean;
FText: string;
public
constructor Create(AText: string);
function ParseFloat: single;
function ParseId: string;
function ParseSymbol: char;
function ParseTransform: TAffineMatrix;
procedure SkipSymbol(ASymbol: char);
procedure SkipUpToSymbol(ASymbol:char);
procedure ClearError;
property Position: integer read FPos write FPos;
property NumberError: boolean read FNumberError;
property Text: string read FText;
property Done: boolean read GetDone;
end;
resourcestring
rsInvalidIndex = 'Invalid index';
implementation
uses BGRASVGShapes;
{ TSVGLinkListeners }
function TSVGLinkListeners.IndexOf(const Item: TSVGLinkEvent): Integer;
begin
Result := 0;
while (Result < FCount) and not
((TMethod(PT(FList)[Result]).Code = TMethod(Item).Code)
and (TMethod(PT(FList)[Result]).Data = TMethod(Item).Data)) do
Inc(Result);
if Result = FCount then
Result := -1;
end;
function TSVGLinkListeners.Remove(const Item: TSVGLinkEvent): Integer;
begin
Result := IndexOf(Item);
if Result >= 0 then
Delete(Result);
end;
{ TSVGCustomElement }
function TSVGCustomElement.GetNamespaceCount: integer;
var
i: Integer;
name: string;
begin
result := 0;
for i := 0 to FDomElem.Attributes.Length-1 do
begin
name := string(FDomElem.Attributes.Item[i].NodeName);
if name.StartsWith('xmlns:') then inc(result);
end;
end;
function TSVGCustomElement.GetNamespacePrefix(AIndex: integer): string;
var
i: Integer;
name: string;
begin
if AIndex < 0 then exit('');
result := '';
for i := 0 to FDomElem.Attributes.Length-1 do
begin
name := string(FDomElem.Attributes.Item[i].NodeName);
if name.StartsWith('xmlns:') then
begin
if AIndex > 0 then dec(AIndex)
else exit(name.Substring(6));
end;
end;
end;
function TSVGCustomElement.GetNamespaceURI(APrefix: string): string;
begin
result := GetAttribute('xmlns:' + APrefix);
end;
procedure TSVGCustomElement.SetNamespaceURI(APrefix: string; AValue: string);
begin
if AValue = '' then FDomElem.RemoveAttribute(DOMString('xmlns:' + APrefix))
else SetAttribute('xmlns:' + APrefix, AValue);
end;
function TSVGCustomElement.GetDOMElement: TDOMElement;
begin
result := FDomElem;
end;
function TSVGCustomElement.GetAttributeOrStyle(AName, ADefault: string;
ACanInherit: boolean): string;
var
curNode: TDOMElement;
styleDecl: DOMString;
begin
result := GetInlineStyle(AName,'');
if result = '' then
begin
result := GetStyleFromStyleSheet(AName,'');
if result = '' then
begin
result := GetAttributeFromElement(FDomElem, AName, false);
if (result = 'currentColor') and (AName <> 'color') then
begin
AName := 'color';
result := GetAttributeFromElement(FDomElem, AName, false);
end;
if result = '' then
begin
if ACanInherit then
begin
curNode := FDomElem;
while true do
begin
if curNode.ParentNode is TDOMElement then
curNode := TDOMElement(curNode.ParentNode)
else break;
styleDecl := curNode.GetAttribute('style');
result := GetPropertyFromStyleDeclarationBlock(string(styleDecl), AName, '');
if result <> '' then exit;
result := GetAttributeFromElement(curNode, AName, false);
if (result = 'currentColor') and (AName <> 'color') then
begin
curNode := FDomElem;
AName := 'color';
continue;
end;
if result <> '' then exit;
end;
end;
result := ADefault;
end;
end;
end;
end;
function TSVGCustomElement.GetAttributeOrStyle(AName, ADefault: string): string;
begin
result := GetAttributeOrStyle(AName, ADefault, true);
end;
function TSVGCustomElement.GetAttributeOrStyle(AName: string): string;
begin
result:= GetAttributeOrStyle(AName,'');
end;
function TSVGCustomElement.GetHorizAttributeOrStyleWithUnit(AName: string;
ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit;
begin
result := GetAttributeOrStyleWithUnit(AName,ADefault);
end;
function TSVGCustomElement.GetArrayOfHorizAttributeOrStyleWithUnit(AName: string): ArrayOfTFloatWithCSSUnit;
begin
result := GetArrayOfAttributeOrStyleWithUnit(AName);
end;
function TSVGCustomElement.GetOrthoAttributeOrStyleWithUnit(AName: string;
ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit;
begin
result := GetAttributeOrStyleWithUnit(AName,ADefault);
end;
function TSVGCustomElement.GetArrayOfOrthoAttributeOrStyleWithUnit(AName: string): ArrayOfTFloatWithCSSUnit;
begin
result := GetArrayOfAttributeOrStyleWithUnit(AName);
end;
class procedure TSVGCustomElement.LocateStyleDeclaration(AText: string; AProperty: string; out AStartPos,
AColonPos, AValueLength: integer);
var i: integer;
curStart,curColon,curValueLength: integer;
function CheckShouldReturnResult: boolean;
begin
if Trim(Copy(AText,curStart,curColon-curStart)) = AProperty then
begin
AStartPos:= curStart;
AColonPos:= curColon;
AValueLength:= curValueLength;
result := true
end
else
result := false
end;
begin
AProperty := Trim(AProperty);
AStartPos := -1;
AColonPos := -1;
AValueLength:= -1;
curStart := -1;
curColon := -1;
curValueLength := -1;
for i := 1 to length(AText) do
begin
if curStart = -1 then
begin
if AText[i] in['-','_','a'..'z','A'..'Z','\'] then
begin
curStart := i;
curColon := -1;
end;
end else
if curColon = -1 then
begin
if AText[i] = ':' then
begin
curColon := i;
curValueLength:= -1;
end;
end else
if AText[i] = ';' then
begin
curValueLength := i-(curColon+1);
if CheckShouldReturnResult then exit;
curStart := -1;
curColon := -1;
curValueLength:= -1;
end;
end;
if curColon <> -1 then
begin
curValueLength:= length(AText)-(curColon+1)+1;
if CheckShouldReturnResult then exit;
end;
end;
class procedure TSVGCustomElement.UpdateStyleDeclarationBlock(var ABlock: string;
AProperty: string; AValue: string);
var
startPos, colonPos, valueLength: integer;
begin
if pos(';',AValue)<>0 then
raise exception.Create('Invalid character in value');
if pos(':',AProperty)<>0 then
raise exception.Create('Invalid character in name');
LocateStyleDeclaration(ABlock, AProperty, startPos,colonPos, valueLength);
if valueLength <> -1 then
begin
delete(ABlock, colonPos+1, valueLength);
insert(' '+Trim(AValue), ABlock, colonPos+1);
end else
begin
while (length(ABlock) > 0) and (ABlock[length(ABlock)] in[' ',#9,#10,#12,#13]) do
delete(ABlock, length(ABlock), 1);
if length(ABlock)>0 then
begin
if ABlock[length(ABlock)] <> ';' then AppendStr(ABlock, '; ');
end;
AppendStr(ABlock, AProperty+': '+AValue);
end;
end;
class function TSVGCustomElement.RemovePropertyFromDeclarationBlock(
var ABlock: string; AProperty: string): boolean;
var
startPos, colonPos, valueLength: integer;
begin
LocateStyleDeclaration(ABlock, AProperty, startPos,colonPos, valueLength);
if valueLength <> -1 then
begin
delete(ABlock, startPos, colonPos+valueLength-startPos+1);
while (length(ABlock)>=startPos) and (ABlock[startPos] in[' ',#9,#10,#12,#13]) do delete(ABlock,startPos,1);
if (length(ABlock)>=startPos) and (ABlock[startPos] = ';') then delete(ABlock,startPos,1);
result := true;
end else
result := false;
end;
class function TSVGCustomElement.GetPropertyFromStyleDeclarationBlock(ABlock: string;
AProperty: string; ADefault: string): string;
var
startPos, colonPos, valueLength: integer;
begin
LocateStyleDeclaration(ABlock, AProperty, startPos,colonPos, valueLength);
if valueLength <> -1 then
result := trim(copy(ABlock, colonPos+1, valueLength))
else
result := ADefault;
end;
function TSVGCustomElement.GetInlineStyle(const AName, ADefault: string
): string;
var
styleDecl: String;
begin
styleDecl := GetAttribute('style','',False);
result := GetPropertyFromStyleDeclarationBlock(styleDecl, AName, ADefault);
end;
function TSVGCustomElement.GetInlineStyleWithUnit(const AName: string): TFloatWithCSSUnit;
begin
result := GetInlineStyleWithUnit(AName, FloatWithCSSUnit(0, cuCustom));
end;
function TSVGCustomElement.GetInlineStyleWithUnit(const AName: string;
ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit;
begin
result := TCSSUnitConverter.parseValue(GetInlineStyle(AName, ''), ADefault);
end;
function TSVGCustomElement.GetStyleFromStyleSheet(const AName, ADefault: string): string;
begin
result := ADefault;
end;
function TSVGCustomElement.GetStyle(const AName, ADefault: string): string;
var
curNode: TDOMElement;
styleDecl: DOMString;
begin
result:= GetInlineStyle(AName,'');
if result <> '' then exit;
result := GetStyleFromStyleSheet(AName,'');
if result <> '' then exit;
curNode := FDomElem;
while true do
begin
if curNode.ParentNode is TDOMElement then
curNode := TDOMElement(curNode.ParentNode)
else break;
styleDecl := curNode.GetAttribute('style');
result := GetPropertyFromStyleDeclarationBlock(string(styleDecl), AName, '');
if result <> '' then exit;
end;
result := ADefault;
end;
function TSVGCustomElement.GetStyle(const AName: string): string;
begin
result:= GetStyle(AName,'');
end;
function TSVGCustomElement.GetAttributeFromElement(ANode: TDOMElement;
AName: string; ACanInherit: boolean): string;
begin
repeat
if ((AName = 'xlink:href') or (AName = 'xlink:title')) and
not ANode.hasAttribute(DOMString(AName)) and ANode.hasAttribute(DOMString(AName.Substring(6))) then
result := string(Trim(ANode.GetAttribute(DOMString(AName.Substring(6)))))
else result := string(Trim(ANode.GetAttribute(DOMString(AName))));
if result = 'inherit' then result := '';
if (result = '') and ACanInherit and
(ANode.ParentNode is TDOMElement) then
ANode := ANode.ParentNode as TDOMElement
else
ANode := nil;
until ANode = nil;
end;
function TSVGCustomElement.GetAttribute(AName: string; ADefault: string;
ACanInherit: boolean): string;
begin
result := GetAttributeFromElement(FDomElem, AName, ACanInherit);
if result = '' then result := ADefault else
if (result = 'currentColor') and (AName <> 'color') then
result := GetAttribute('color', ADefault, ACanInherit);
end;
function TSVGCustomElement.GetAttribute(AName: string; ADefault: string): string;
begin
result := GetAttribute(AName, ADefault, False);
end;
function TSVGCustomElement.GetAttribute(AName: string): string;
begin
result:= GetAttribute(AName,'');
end;
function TSVGCustomElement.GetAttributeNumber(AName: string; ADefault: TSVGNumber): TSVGNumber;
begin
result := TCSSUnitConverter.parseValue(GetAttribute(AName),ADefault);
end;
function TSVGCustomElement.GetAttributeWithUnit(AName: string; ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit;
begin
result := TCSSUnitConverter.parseValue(GetAttribute(AName),ADefault);
end;
function TSVGCustomElement.GetAttributeWithUnit(AName: string): TFloatWithCSSUnit;
begin
result := GetAttributeWithUnit(AName,FloatWithCSSUnit(0,cuCustom));
end;
function TSVGCustomElement.GetAttributeOrStyleWithUnit(AName: string;
ADefault: TFloatWithCSSUnit; ACanInherit: boolean): TFloatWithCSSUnit;
var
valueText: string;
begin
valueText := GetAttributeOrStyle(AName, '', ACanInherit);
result := TCSSUnitConverter.parseValue(valueText,ADefault);
end;
function TSVGCustomElement.GetAttributeOrStyleWithUnit(AName: string; ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit;
begin
result := GetAttributeOrStyleWithUnit(AName, ADefault, True);
end;
function TSVGCustomElement.GetAttributeOrStyleWithUnit(AName: string): TFloatWithCSSUnit;
begin
result := GetAttributeOrStyleWithUnit(AName,FloatWithCSSUnit(0,cuCustom));
end;
function TSVGCustomElement.GetVerticalAttributeOrStyleWithUnit(AName: string;
ADefault: TFloatWithCSSUnit; ACanInherit: boolean): TFloatWithCSSUnit;
begin
result := GetAttributeOrStyleWithUnit(AName,ADefault,ACanInherit);
end;
function TSVGCustomElement.GetVerticalAttributeOrStyleWithUnit(AName: string;
ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit;
begin
result := GetVerticalAttributeOrStyleWithUnit(AName,ADefault,true);
end;
function TSVGCustomElement.GetArrayOfVerticalAttributeOrStyleWithUnit(
AName: string): ArrayOfTFloatWithCSSUnit;
begin
result := GetArrayOfAttributeOrStyleWithUnit(AName);
end;
procedure TSVGCustomElement.SetInlineStyle(AName: string; AValue: string);
var
declarationBlock: string;
begin
declarationBlock := GetAttribute('style','',false);
UpdateStyleDeclarationBlock(declarationBlock, AName, AValue);
SetAttribute('style', declarationBlock);
end;
procedure TSVGCustomElement.SetInlineStyle(AName: string;
AValue: TFloatWithCSSUnit);
begin
SetInlineStyle(AName, FUnits.formatValue(AValue));
end;
function TSVGCustomElement.GetOrthoAttributeWithUnit(AName: string;
ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit;
begin
result := GetAttributeWithUnit(AName,ADefault);
end;
function TSVGCustomElement.GetOrthoAttributeWithUnit(AName: string): TFloatWithCSSUnit;
begin
result := GetOrthoAttributeWithUnit(AName,FloatWithCSSUnit(0,cuCustom));
end;
function TSVGCustomElement.GetHorizAttribute(AName: string;
ADefault: TSVGNumber): TSVGNumber;
var value: TFloatWithCSSUnit;
begin
value.value := GetAttributeNumber(AName,ADefault);
value.CSSUnit := cuPixel;
result := value.value;
end;
function TSVGCustomElement.GetHorizAttribute(AName: string): TSVGNumber;
begin
result := GetHorizAttribute(AName,0);
end;
function TSVGCustomElement.GetHorizAttributeWithUnit(AName: string;
ADefault: TFloatWithCSSUnit): TFloatWithCSSUnit;
begin
result := GetAttributeWithUnit(AName,ADefault);
end;
function TSVGCustomElement.GetHorizAttributeWithUnit(AName: string): TFloatWithCSSUnit;
begin
result := GetHorizAttributeWithUnit(AName,FloatWithCSSUnit(0,cuCustom));
end;
function TSVGCustomElement.GetArrayOfAttributeNumber(AName: string): ArrayOfTSVGNumber;
begin
result := GetArrayOfAttributeNumber(AName,true);
end;
function TSVGCustomElement.GetArrayOfAttributeWithUnit(AName: string; ACanInherit: boolean): ArrayOfTFloatWithCSSUnit;
begin
result := TCSSUnitConverter.parseArrayOfValuesWithUnit(GetAttribute(AName,'',ACanInherit));
end;
function TSVGCustomElement.GetArrayOfAttributeWithUnit(AName: string): ArrayOfTFloatWithCSSUnit;
begin
result := GetArrayOfAttributeWithUnit(AName,true);
end;
function TSVGCustomElement.GetArrayOfAttributeOrStyleWithUnit(AName: string): ArrayOfTFloatWithCSSUnit;
var
valueText: string;
begin
valueText := GetAttributeOrStyle(AName);
result := TCSSUnitConverter.parseArrayOfValuesWithUnit(valueText);
end;
function TSVGCustomElement.GetArrayOfOrthoAttributeWithUnit(AName: string;
ACanInherit: boolean): ArrayOfTFloatWithCSSUnit;
begin
result := GetArrayOfAttributeWithUnit(AName, ACanInherit);
end;
function TSVGCustomElement.GetArrayOfOrthoAttributeWithUnit(AName: string): ArrayOfTFloatWithCSSUnit;
begin
result := GetArrayOfOrthoAttributeWithUnit(AName, true);
end;
function TSVGCustomElement.GetArrayOfHorizAttributeWithUnit(AName: string; ACanInherit: boolean): ArrayOfTFloatWithCSSUnit;
begin
result := GetArrayOfAttributeWithUnit(AName,ACanInherit);
end;
function TSVGCustomElement.GetArrayOfHorizAttributeWithUnit(AName: string): ArrayOfTFloatWithCSSUnit;