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DesignBox.pas
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DesignBox.pas
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{ ******************************************************************************
* *
* DesignBox - Basic canvas/drawing component for Delphi *
* *
* https://github.com/gmurt/DesignBox *
* *
* Copyright 2021 Graham Murt *
* *
* email: [email protected] *
* *
* Licensed under the Apache License, Version 2.0 (the "License"); *
* you may not use this file except in compliance with the License. *
* You may obtain a copy of the License at *
* *
* http://www.apache.org/licenses/LICENSE-2.0 *
* *
* Unless required by applicable law or agreed to in writing, software *
* distributed under the License is distributed on an "AS IS" BASIS, *
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
* See the License for the specific language governing permissions and *
* limitations under the License. *
* *
*******************************************************************************}
unit DesignBox;
interface
uses
Windows, Messages, System.SysUtils, System.Classes, Vcl.Controls, System.Types, System.Generics.Collections,
vcl.Graphics, System.Generics.Defaults, System.Json, vcl.Imaging.Jpeg, Vcl.Forms;
const
C_HIGHLIGHT_COLOR = clHotlight;
type
TDesignBoxMode = (dbmSelect, dbmDraw);
TItemOption = (canSize, canMove, canDelete, canSelect, canEdit);
TItemOptions = set of TItemOption;
TDesignSelectionGrabHandleStyle = (ghsSquare, ghsCircle, ghsNone);
TDesignBox = class;
TDesignBoxBaseItem = class;
TDesignBoxAfterDrawEvent = procedure(Sender: TObject; aNewItem : TDesignBoxBaseItem; aIndex: integer) of object; // triggered after MANUALLY drawing an item
TDesignBoxAfterEditEvent = procedure(Sender: TObject; aItem : TDesignBoxBaseItem) of object; // for text editing changes at the moment
IBrushObject = interface
['{66B92A59-B773-4DE2-97DF-34CA29245A0E}']
function GetBrush: TBrush;
procedure SetBrush(const Value: TBrush);
property Brush: TBrush read GetBrush write SetBrush;
end;
IFontObject = interface
['{29E2758B-E873-4E77-ed1D-930588E43164}']
function GetFont: TFont;
procedure SetFont(const Value: TFont);
property Font: TFont read GetFont write SetFont;
end;
IPenObject = interface
['{09E70A1C-6C2D-4BDE-8D1C-3311B186F411}']
function GetPen: TPen;
procedure SetPen(const Value: TPen);
property Pen: TPen read GetPen write SetPen;
end;
IDesignTextEditor = interface
['{B31CA1D5-D905-4F58-A460-8BE4A77871D7}']
function GetText: string;
procedure SetText(const Value: string);
property Text : string read GetText write SetText;
end;
TDesignSelectionStyle = class
private
fColor : TColor;
fPenWidth : integer;
fGrabHandleCanSize : TDesignSelectionGrabHandleStyle;
fGrabHandleNoSize : TDesignSelectionGrabHandleStyle;
public
constructor Create; virtual;
property Color : TColor read fColor write fColor default C_HIGHLIGHT_COLOR;
property PenWidth : integer read fPenWidth write fPenWidth ;
property GrabHandleCanSize : TDesignSelectionGrabHandleStyle read fGrabHandleCanSize write fGrabHandleCanSize default ghsSquare;
property GrabHandleNoSize : TDesignSelectionGrabHandleStyle read fGrabHandleNoSize write fGrabHandleNoSize default ghsNone;
end;
TDesignBoxSelectItemEvent = procedure(Sender: TObject; AItem: TDesignBoxBaseItem) of object;
TDesignUndoList = class
private
FDesignBox: TDesignBox;
FChanges: TStrings;
FChangesBookmark: integer;
function GetCount: integer;
function GetCanRedo: Boolean;
function GetCanUndo: Boolean;
function GetCurrentSnapshot: string;
procedure SaveSnapshot(AForce: Boolean);
public
constructor Create(ADesignBox: TDesignBox); virtual;
destructor Destroy; override;
procedure Undo;
procedure Redo;
property Count: integer read GetCount;
property CanUndo: Boolean read GetCanUndo;
property CanRedo: Boolean read GetCanRedo;
end;
TDesignFont = class(TFont)
public
procedure SaveToJson(AJson: TJsonObject);
procedure LoadFromJson(AJson: TJsonObject);
end;
TDesignBrush = class(TBrush)
public
procedure SaveToJson(AJson: TJsonObject);
procedure LoadFromJson(AJson: TJsonObject);
end;
TDesignPen = class(TPen)
public
procedure SaveToJson(AJson: TJsonObject);
procedure LoadFromJson(AJson: TJsonObject);
end;
TDesignBoxItemInterface = class(TPersistent, IInterface)
protected
function QueryInterface(const IID: TGUID; out Obj): HResult; stdcall;
function _AddRef: Integer; stdcall;
function _Release: Integer; stdcall;
end;
TDesignBoxBaseItem = class(TDesignBoxItemInterface)
private
FDesignBox: TDesignBox;
FPosition: TPoint; // mu
FWidth: integer; // mu
FHeight: integer; // mu
FSelected: Boolean;
FSelectionStyle : TDesignSelectionStyle;
FDrawOffset: TPoint;
fOptions : TItemOptions;
fVisible: boolean;
fTag: NativeInt;
fData: TObject;
function GetLeftMM: Extended;
function GetTopMM: Extended;
procedure Changed;
procedure SetLeftMM(const Value: Extended);
procedure SetTopMM(const Value: Extended);
procedure SetOptions(const Value: TItemOptions);
function GetWidthMM: Extended;
procedure SetWidthMM(const Value: Extended);
function GetHeightMm: Extended;
procedure SetHeightMm(const Value: Extended);
function GetCenterPtMm: TPointF;
procedure SetCenterPtMm(const Value: TPointF);
procedure SetVisible(const Value: boolean);
procedure SetSelectionStyle(const Value: TDesignSelectionStyle);
protected
property DesignBoxParent: TDesignBox read fDesignBox;
procedure SetSelectedItem(const Value: Boolean); virtual;
function RectMM: TRectF;
function BoundsRect: TRect;
procedure PaintToCanvas(ACanvas: TCanvas); virtual; abstract;
procedure DrawSelectedRect(ACanvas: TCanvas); virtual;
property Data: TObject read fData write fData; // for linking external object instances (or even other design box items)
function GetSelectionRectPaddingPx: TSize; virtual; // descendant classes can use this to alter the selection rectangle size
public
constructor Create(ADesignBox: TDesignBox); virtual;
destructor Destroy; override;
function PointInRgn(x, y: integer): Boolean;
function RectsIntersect(ARect: TRect): Boolean;
function RectPixels: TRect; virtual;
procedure UpdateToDragPosition;
procedure SnapToGrid;
procedure SaveToJson(AJson: TJsonObject); virtual;
function asJsonObject: TJsonObject;
procedure LoadFromJson(AJson: TJsonObject); virtual;
property Selected: Boolean read FSelected write SetSelectedItem;
property SelectionStyle : TDesignSelectionStyle read fSelectionStyle write SetSelectionStyle;
property LeftMM: Extended read GetLeftMM write SetLeftMM;
property TopMM: Extended read GetTopMM write SetTopMM;
function muPos : TPoint;
function muSize : TSize;
property WidthMM: Extended read GetWidthMM write SetWidthMM;
property HeightMM: Extended read GetHeightMm write SetHeightMm;
property CenterPtMm: TPointF read GetCenterPtMm write SetCenterPtMm;
property Options: TItemOptions read fOptions write SetOptions;
property Visible: boolean read fVisible write SetVisible;
property Tag: NativeInt read fTag write fTag;
property SelectionRectPaddingPx : TSize read GetSelectionRectPaddingPx;
end;
TDesignBoxBaseItemClass = class of TDesignBoxBaseItem;
TDragHandlePos = (dhTopLeft,dhTopRight,dhBottomRight,dhBottomLeft); // clockwise from (0,0)
TDragHandleRectArray = array[TDragHandlePos] of TRect;
/// base class for items with a set of grab handles - note Text items will not have this as Font size & text property will determine bounds
TDesignBoxItemSizable = class(TDesignBoxBaseItem)
private
fSelectHandles: TDragHandleRectArray;
//fIsDraggingHandle: boolean; // is user dragging via a select handle?
//fSelectedHandle: TDragHandlePos; // if so which one ?
protected
procedure PaintToCanvas(ACanvas: TCanvas); override;
procedure DrawSelectedRect(ACanvas: TCanvas); override;
public
constructor Create(ADesignBox: TDesignBox); override;
destructor Destroy; override;
procedure SetCoords(ALeftMM, ATopMM, ARightMM, ABottomMM: single);
end;
TDesignBoxItemOutlineShape = class(TDesignBoxItemSizable, IPenObject)
private
FPen: TDesignPen;
function GetPen: TPen;
procedure DoPenChange(Sender: TObject);
procedure SetPen(const Value: TPen);
protected
procedure PaintToCanvas(ACanvas: TCanvas); override;
public
constructor Create(ADesignBox: TDesignBox); override;
destructor Destroy; override;
procedure SaveToJson(AJson: TJsonObject); override;
procedure LoadFromJson(AJson: TJsonObject); override;
property Pen: TPen read GetPen write SetPen;
end;
TDesignBoxItemFilledShape = class(TDesignBoxItemOutlineShape, IBrushObject)
private
FBrush: TDesignBrush;
procedure DoBrushChange(Sender: TObject);
function GetBrush: TBrush;
procedure SetBrush(const Value: TBrush);
protected
procedure PaintToCanvas(ACanvas: TCanvas); override;
public
constructor Create(ADesignBox: TDesignBox); override;
destructor Destroy; override;
procedure SaveToJson(AJson: TJsonObject); override;
procedure LoadFromJson(AJson: TJsonObject); override;
property Brush: TBrush read GetBrush write SetBrush;
end;
TDesignBoxItemText = class(TDesignBoxItemFilledShape, IFontObject, IDesignTextEditor)
private
FText: string;
FFont: TDesignFont;
function GetFont: TFont;
procedure DoFontChange(Sender: TObject);
function GetText: string;
procedure SetText(const AText: string);
procedure SetFont(const Value: TFont);
protected
procedure PaintToCanvas(ACanvas: TCanvas); override;
public
constructor Create(ADesignBox: TDesignBox); override;
destructor Destroy; override;
procedure SaveToJson(AJson: TJsonObject); override;
procedure LoadFromJson(AJson: TJsonObject); override;
property Text: string read GetText write SetText;
property Font: TFont read GetFont write SetFont;
end;
TDesignBoxItemEllipse = class(TDesignBoxItemFilledShape)
protected
procedure PaintToCanvas(ACanvas: TCanvas); override;
end;
TDesignBoxItemRectangle = class(TDesignBoxItemFilledShape)
private
FRoundnessMm: single;
procedure SetRoundnessMm(const Value: single);
protected
procedure PaintToCanvas(ACanvas: TCanvas); override;
public
constructor Create(ADesignBox: TDesignBox); override;
property RoundnessMm: single read FRoundnessMm write SetRoundnessMm;
end;
TDesignBoxItemGraphic = class(TDesignBoxItemSizable)
private
FGraphic: TPicture;
procedure SetGraphic(const Value: TPicture);
protected
procedure PaintToCanvas(ACanvas: TCanvas); override;
public
constructor Create(ADesignBox: TDesignBox); override;
destructor Destroy; override;
procedure SaveToJson(AJson: TJsonObject); override;
procedure LoadFromJson(AJson: TJsonObject); override;
property Graphic: TPicture read FGraphic write SetGraphic;
end;
TItemAlignment = (ialLeftSides, ialTopSides, ialRightSides, ialBottomSides, ialToGrid,
ialVertCenters, ialHorzCenters);
TDesignBoxItemList = class(TObjectList<TDesignBoxBaseItem>)
private
FDesignBox: TDesignBox;
function GetSelectedCount: integer;
procedure PaintToCanvas(ACanvas: TCanvas);
function BoundsRectMM: TRectF;
public
constructor Create(ADesignBox: TDesignBox); virtual;
function BoundsRect: TRect;
procedure AlignItems(const aAlignment : TItemAlignment);
function Add(AItem: TDesignBoxBaseItem; ABoundsMm: TRectF): TDesignBoxBaseItem; overload;
function Add(AClass: TDesignBoxBaseItemClass; ABoundsMm: TRectF): TDesignBoxBaseItem; overload;
function ItemAtPos(x, y: integer): TDesignBoxBaseItem;
procedure LoadFromJson(AJson: TJsonObject);
procedure SaveToJson(AJson: TJsonObject; const VisualOnly: boolean; const baseClass: TDesignBoxBaseItemClass);
procedure DeleteSelected;
property SelectedCount: integer read GetSelectedCount;
procedure DeselectAll;
procedure SelectAll;
procedure SelectItems(AItems: array of TDesignBoxBaseItem; const ADeselectOthers: Boolean = False);
property DesignBox: TDesignBox read fDesignBox;
end;
TDesignMeasurementSystem = (dbMetric, dbMetricCent, dbImperial);
TDesignBoxRulerOptions = class(TPersistent)
private
fDesignBox : TDesignBox;
fForegroundColor: TColor;
fBackgroundColor: TColor;
fVisible: Boolean;
fRulerHeightPx : integer;
fRulerWidthPx : integer;
fShowUnits: boolean;
fUnits: string;
fMeasurementSystem : TDesignMeasurementSystem;
fFont : TDesignFont;
procedure SetBackgroundColor(const Value: TColor);
procedure SetForegroundColor(const Value: TColor);
procedure SetVisible(const Value: boolean);
function GetHeightPx: integer;
function GetWidthPx: integer;
procedure SetShowUnits(const Value: boolean);
procedure SetUnits(const Value: string);
procedure SetFont(const Value: TDesignFont);
procedure internalHandleRulerFontChanged(Sender: TObject);
procedure SetMeasurementSystem(const Value: TDesignMeasurementSystem);
protected
const
UNIT_NAMES: array[TDesignMeasurementSystem] of string = ('mm', 'cm', 'in');
public
constructor Create(ADesignBox: TDesignBox); virtual;
destructor Destroy; override;
procedure Assign(Source: TPersistent); override;
procedure LoadFromJsonObject(AJson: TJsonObject);
procedure SaveToJsonObject(AJson: TJsonObject);
published
property ForegroundColor: TColor read fForegroundColor write SetForegroundColor default clBlack;
property BackgroundColor: TColor read fBackgroundColor write SetBackgroundColor default clWhite;
property Visible: boolean read fVisible write SetVisible default true;
property WidthPx : integer read GetWidthPx;
property HeightPx : integer read GetHeightPx;
property ShowUnits: boolean read fShowUnits write SetShowUnits default false;
property Units: string read fUnits write SetUnits;
property MeasurementSystem: TDesignMeasurementSystem read fMeasurementSystem write SetMeasurementSystem;
property Font: TDesignFont read fFont write SetFont;
end;
TDesignBoxGridStyle = (dbgsHorz, dbgsVert, dbgsBoth);
TDesignBoxGridOptions = class(TPersistent)
private
FDesignBox: TDesignBox;
FVisible: Boolean;
FSizeMm: integer;
FColor: TColor;
FSnapToGrid: boolean;
fStyle: TDesignBoxGridStyle;
procedure SetSizeMm(const Value: integer);
procedure SetColor(const Value: TColor);
procedure SetSnapToGrid(const Value: Boolean);
procedure SetStyle(const Value: TDesignBoxGridStyle);
procedure SetVisible(const Value: Boolean);
public
constructor Create(ADesignBox: TDesignBox); virtual;
procedure Assign(Source: TPersistent); override;
procedure LoadFromJsonObject(AJson: TJsonObject);
procedure SaveToJsonObject(AJson: TJsonObject);
function PixelSize: integer;
published
property Color: TColor read FColor write SetColor default $00F7E1CE;
property SizeMm: integer read FSizeMm write SetSizeMm default 5;
property Visible: Boolean read FVisible write SetVisible default False;
property SnapToGrid: Boolean read FSnapToGrid write SetSnapToGrid default False;
property Style: TDesignBoxGridStyle read fStyle write SetStyle default dbgsBoth;
end;
TDesignBoxBackgroundPosition = (bgStretch, bgStretchProp, bgCentre);
TDesignBoxCanvas = class(TGraphicControl)
private
//FTempCanvas: TBitmap;
FBuffer: TBitmap;
FDesignBox: TDesignBox;
FBrush: TBrush;
FFont: TFont;
FPen: TPen;
FDragging: Boolean;
FMouseDownPos: TPoint;
FMouseXY: TPoint;
fBackground: TPicture;
fBackgroundPos: TDesignBoxBackgroundPosition;
procedure SetBrush(const Value: TBrush);
procedure SetFont(const Value: TFont);
procedure SetPen(const Value: TPen);
procedure OnBrushChanged(Sender: TObject);
procedure OnFontChanged(Sender: TObject);
procedure OnPenChanged(Sender: TObject);
procedure SetBackground(const Value: TPicture);
procedure SetBackgroundPos(const Value: TDesignBoxBackgroundPosition);
function GetDestRect(aOriginalSize, aClientSize: TSize; Stretch, Proportional, Center: boolean): TRect;
procedure SaveBackgroundToJson(const aJson: TJsonObject);
procedure LoadBackgroundFromJson(const aJson: TJsonObject);
protected
procedure WMEraseBackground(var message: TMessage); message WM_ERASEBKGND;
procedure Paint; override;
procedure MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
procedure MouseMove(Shift: TShiftState; X, Y: Integer); override;
procedure DrawBackground(const aRect: TRect; const aAlternateBuffer: TBitmap = nil);
procedure SaveToJson(const aJson: TJsonObject);
procedure LoadFromJson(const aJson: TJsonObject);
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure SetSize(w, h: integer);
function TextExtent(const AText: string): TSizeF;
function TextWidth(const AText: string): single;
function TextHeight(const AText: string): single;
function MeasureText(const AText: string): TSizeF;
function TextOut(ALeftMM, ATopMM: single; AText: string): TDesignBoxItemText;
function Draw(ALeftMM, ATopMM: single; AGraphic: TGraphic): TDesignBoxItemGraphic;
function StretchDraw(ARect: TRectF; AGraphic: TGraphic): TDesignBoxItemGraphic;
function Rectangle(ALeftMM, ATopMM, ARightMM, ABottomMM: single; const ARoundnessMm: single = 0): TDesignBoxItemRectangle; overload;
function Rectangle(ABoundsMm: TRectF; const ARoundnessMm: single = 0): TDesignBoxItemRectangle; overload;
function Ellipse(ABoundsMm: TRectF): TDesignBoxItemEllipse; overload;
function Ellipse(ALeftMM, ATopMM, ARightMM, ABottomMM: single): TDesignBoxItemEllipse; overload;
procedure BeginUpdate;
procedure EndUpdate;
property Background: TPicture read fBackground write SetBackground;
property BackgroundPos: TDesignBoxBackgroundPosition read fBackgroundPos write SetBackgroundPos;
property Brush: TBrush read FBrush write SetBrush;
property Font: TFont read FFont write SetFont;
property Pen: TPen read FPen write SetPen;
end;
TDesignBoxMouseInteractionOptions = class
private
fDragSelect : boolean;
procedure SetDragSelect(const Value: boolean);
protected
procedure LoadFromJsonObject(AJson: TJsonObject);
procedure SaveToJsonObject(AJson: TJsonObject);
public
constructor Create;
property DragSelect: boolean read fDragSelect write SetDragSelect default True;
end;
TDesignBox = class(TScrollingWinControl)
private
FMode: TDesignBoxMode;
fDrawClass : TDesignBoxBaseItemClass;
FCanvas: TDesignBoxCanvas;
FItems: TDesignBoxItemList;
FSelectedItems: TDesignBoxItemList;
FOnSelectItem: TDesignBoxSelectItemEvent;
FBackgroundColor: TColor;
FPageColor: TColor;
FPageOffset: TPoint;
FPageSizeMM: TSize;
FUndoList: TDesignUndoList;
FOnChange: TNotifyEvent;
FGridOptions: TDesignBoxGridOptions;
FRulerOptions: TDesignBoxRulerOptions;
FUpdateCount: integer;
FAfterDrawItem: TDesignBoxAfterDrawEvent;
FAfterEditItem: TDesignBoxAfterEditEvent;
FAfterScale: TNotifyEvent;
FBorderStyle: TBorderStyle;
fMouseInteraction: TDesignBoxMouseInteractionOptions;
fScalePercent: integer; // 100 = 100% = normal size - interpreted by Scale property as Single i.e "1.00"
fWantTabs: boolean;
fAllowTextEdit: boolean;
function GetSelectedItems: TDesignBoxItemList;
procedure SetBackgroundColor(const Value: TColor);
procedure RecordSnapshot;
procedure DrawRulers(ACanvas: TCanvas);
procedure ResizeCanvas;
function GetPageHeightMM: integer;
function GetPageWidthMM: integer;
procedure SetPageHeightMM(const Value: integer);
procedure SetPageWidthMM(const Value: integer);
procedure SetGridOptions(const Value: TDesignBoxGridOptions);
procedure DrawGrid(ACanvas: TCanvas);
procedure SetRulerOptions(const Value: TDesignBoxRulerOptions);
procedure SetPageColor(const Value: TColor);
procedure SetBorderStyle(Value: TBorderStyle);
procedure WMNCHitTest(var Message: TWMNCHitTest); message WM_NCHITTEST;
procedure CMCtl3DChanged(var Message: TMessage); message CM_CTL3DCHANGED;
procedure CMVisibleChanged(var Message: TMessage); message CM_VISIBLECHANGED;
procedure SetMouseInteraction(const Value: TDesignBoxMouseInteractionOptions);
function GetScale: extended;
procedure SetScale(const Value: extended);
procedure SetWantTabs(const Value: boolean);
procedure SetAllowTextEdit(const Value: boolean);
procedure SetMode(const Value: TDesignBoxMode);
protected
procedure CreateParams(var Params: TCreateParams); override;
procedure PaintWindow(DC: HDC); override;
procedure Loaded; override;
procedure Resize; override;
procedure WMHScroll(var Message: TWMHScroll); message WM_HSCROLL;
procedure WMVScroll(var Message: TWMVScroll); message WM_VSCROLL;
procedure WMEraseBackground(var message: TMessage); message WM_ERASEBKGND;
procedure WMSetFocus(var Message: TWMSetFocus); message WM_SETFOCUS;
procedure WMKillFocus(var Message: TWMKillFocus); message WM_KILLFOCUS;
procedure CNKeyDown(var Message: TWMKeyDown); message CN_KEYDOWN;
procedure CNKeyUp(var Message: TWMKeyUp); message CN_KEYUP;
procedure KeyDown(var Key: Word; Shift: TShiftState); override;
procedure KeyPress(var Key: Char); override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure BeginUpdate;
procedure Clear;
procedure Endupdate;
function ToJsonObject: TJsonObject; overload;
function toJsonObject(const VisualOnly: boolean; const baseClass: TDesignBoxBaseItemClass): TJsonObject; overload;
procedure SaveToStream(AStream: TStream);
procedure LoadFromStream(AStream: TStream);
procedure LoadFromJson(AJsonData: string);
procedure SaveToFile(AFilename: string);
procedure LoadFromFile(AFilename: string);
procedure BringToFront;
procedure BringForwards;
procedure SendToBack;
procedure SendBackwards;
procedure SetPageSize(AWidthMM, AHeightMM: integer); overload;
procedure SetPageSize(APageSize: TSize); overload;
function GetPageSizeMu : TSize;
procedure Redraw;
procedure Undo;
procedure Redo;
procedure SaveSnapShot(aForce: boolean);
function CanUndo : boolean;
function CanRedo : boolean;
procedure AlignItems(const aAlignment: TItemAlignment);
property Canvas: TDesignBoxCanvas read FCanvas;
property Items: TDesignBoxItemList read FItems;
property Mode: TDesignBoxMode read FMode write SetMode default dbmSelect;
property DrawClass : TDesignBoxBaseItemClass read fDrawClass write fDrawClass;
property SelectedItems: TDesignBoxItemList read GetSelectedItems;// write SetSelectedItem;
procedure SaveAsBitmap(const AFileName: string); overload;
procedure SaveAsBitmap(const ABitmap: TBitmap); overload;
procedure SaveAsBitmap(const AStream: TStream); overload;
procedure SaveAsJpeg(const aFilename: string; const aCompressionQuality: TJPEGQualityRange = 100; const aGrayscale: boolean = false); overload;
procedure SaveAsJpeg(const aStream: TStream; const aCompressionQuality: TJPEGQUalityRange = 100; const aGrayscale: boolean = false); overload;
procedure SaveAsPNG(const aFileName: string; const aTransparent: boolean); overload;
procedure SaveAsPNG(const aStream: TStream; const aTransparent: boolean); overload;
published
property AllowTextEdit : boolean read fAllowTextEdit write SetAllowTextEdit default True;
property Align;
property BackgroundColor: TColor read fBackgroundColor write SetBackgroundColor default clSilver;
property BorderStyle: TBorderStyle read FBorderStyle write SetBorderStyle default bsSingle;
property Ctl3D;
property PageColor : TColor read fPageColor write SetPageColor default clWhite;
property GridOptions: TDesignBoxGridOptions read FGridOptions write SetGridOptions;
property PopupMenu;
property RulerOptions: TDesignBoxRulerOptions read fRulerOptions write SetRulerOptions;
property MouseInteraction: TDesignBoxMouseInteractionOptions read fMouseInteraction write SetMouseInteraction;
property PageWidthMM: integer read GetPageWidthMM write SetPageWidthMM;
property PageHeightMM: integer read GetPageHeightMM write SetPageHeightMM;
property WantTabs: boolean read fWantTabs write SetWantTabs default True;
property Scale: extended read GetScale write SetScale;
property OnChange: TNotifyEvent read FOnChange write FOnChange;
property OnKeyDown;
property OnKeyPress;
property OnKeyUp;
property OnMouseDown;
property OnMouseMove;
property OnMouseUp;
property OnSelectItem: TDesignBoxSelectItemEvent read FOnSelectItem write FOnSelectItem;
property AfterDrawItem: TDesignBoxAfterDrawEvent read fAfterDrawItem write fAfterDrawItem;
property AfterEditItem: TDesignBoxAfterEditEvent read fAfterEditItem write fAfterEditItem;
property AfterScale : TNotifyEvent read fAfterScale write fAfterScale;
property OnResize;
end;
procedure Register;
function MmToPixels(AValue: Extended): integer;
function PixelsToMM(AValue: Extended) : single;
function MMtoMu(AValue: Extended) : integer;
function MuToMM(AValue: integer) : Extended;
implementation
uses System.NetEncoding, PngImage, Math, System.UITypes, System.RTTI,
Vcl.Clipbrd;
const
C_UNFOCUSED_HIGHLIGHT_COLOR = clDkGray;
C_DPI = 300;
C_MM_PER_INCH = 25.4;
C_DRAG_THRESHOLD = 4; //px
procedure Register;
begin
RegisterComponents('Samples', [TDesignBox]);
end;
function ScreenDpi: Integer;
begin
Result := Screen.PixelsPerInch;
end;
function MmToPixels(AValue: Extended): integer;
var
AScale: single;
begin
AScale := ScreenDpi / C_DPI;
Result := Round((C_DPI / C_MM_PER_INCH) * AValue * AScale);
end;
function MmToPixelsF(AValue: Extended): Extended;
var
AScale: single;
begin
AScale := ScreenDpi / C_DPI;
Result := ((C_DPI / C_MM_PER_INCH) * AValue) * AScale;
end;
function PixelsToMM(AValue: Extended) : single;
begin
Result := AValue / (ScreenDpi / C_MM_PER_INCH);
end;
function MMtoMu(AValue: Extended) : integer;
begin
result := Trunc(AValue * 1000);
end;
function MuToMM(AValue: integer) : Extended;
begin
result := AValue / 1000;
end;
function MuToPixels(AValue: integer) : integer;
begin
result := MMtoPixels(MuToMM(AValue));
end;
function PixelsToMu(AValue: integer): integer;
begin
result := Trunc(PixelsToMM(AValue) * 1000);
end;
{ TDesignBoxItemInterface }
function TDesignBoxItemInterface.QueryInterface(const IID: TGUID; out Obj): HResult;
begin
if GetInterface(IID, Obj) then
Result := S_OK
else
Result := E_NOINTERFACE;
end;
function TDesignBoxItemInterface._AddRef: Integer;
begin
Result := -1;
end;
function TDesignBoxItemInterface._Release: Integer;
begin
Result := -1;
end;
{ TDesignBox }
procedure TDesignBox.AlignItems(const aAlignment: TItemAlignment);
begin
SelectedItems.AlignItems(aAlignment);
Redraw;
end;
procedure TDesignBox.BeginUpdate;
begin
Inc(FUpdateCount);
end;
procedure TDesignBox.BringForwards;
var
AItem: TDesignBoxBaseItem;
AIndex: integer;
begin
for AItem in SelectedItems do
begin
AIndex := FItems.IndexOf(AItem);
if AIndex < FItems.Count-1 then
FItems.Move(AIndex, AIndex+1);
end;
Redraw;
end;
procedure TDesignBox.BringToFront;
var
AItem: TDesignBoxBaseItem;
begin
for AItem in SelectedItems do
begin
FItems.Extract(AItem);
FItems.Add(AItem);
end;
Redraw;
end;
function TDesignBox.CanRedo: boolean;
begin
result := FUndoList.CanRedo;
end;
function TDesignBox.CanUndo: boolean;
begin
result := fUndoList.CanUndo;
end;
procedure TDesignBox.Clear;
begin
FItems.Clear;
FCanvas.Background := nil;
Redraw;
end;
procedure TDesignBox.CMCtl3DChanged(var Message: TMessage);
begin
if NewStyleControls and (FBorderStyle = bsSingle) then RecreateWnd;
inherited;
end;
procedure TDesignBox.CMVisibleChanged(var Message: TMessage);
var
I: Integer;
begin
inherited;
if not (csDestroying in ComponentState) then
for I := 0 to DockClientCount - 1 do
DockClients[I].Visible := Visible;
end;
procedure TDesignBox.CNKeyDown(var Message: TWMKeyDown);
var
KeyCode : word;
aMoveBy: TPoint;
AItem: TDesignBoxBaseItem;
cMoveAmount : integer;
Shift: TShiftState;
idx, saveIdx : integer;
Found, NoMoreLeft : boolean;
begin
KeyCode := Message.CharCode;
Shift := KeyDataToShiftState(Message.KeyData);
// so this works in principle - just need to get arrow keys working via CNKeyDown, CNKeyUp message I think.
if ssCtrl in Shift then
cMoveAmount := MMToPixels(1)
else
cMoveAmount := MMtoPixels(FGridOptions.SizeMm);
// if one item selected, lets move to the next item (don't use fSelectedItems, we need the Getter method to be called to populate the list
if (KeyCode = VK_TAB) and (SelectedItems.Count = 1) and (Items.Count > 1) and WantTabs then
begin
{ Extract this bit into FItems.SelectNext(idx); ???? }
idx := FItems.IndexOf(SelectedItems[0]);
saveIdx := idx;
// Searchng for the next Selected Item
repeat
if ssShift in Shift then
dec(idx) // shift-tab goes backwards
else
inc(idx);
if (idx < 0) and (ssShift in Shift) then
idx := Pred(fItems.Count) // backwards from the start = move to the end
else
if (idx = FItems.Count) and (not (ssShift in Shift)) then
idx := 0; // circle back to the start;
AItem := FItems[idx];
Found := (canSelect in AItem.Options) and (AItem.Visible);
NoMoreLeft := (saveIdx = idx); //
until found or NoMoreLeft;
if found then
begin
FItems.DeselectAll;
FItems.Items[idx].Selected := TRUE;
if assigned(fOnSelectItem) then
FOnSelectItem(Self, AItem);
Redraw;
end;
end else
if (KeyCode in [VK_UP, VK_DOWN, VK_LEFT, VK_RIGHT]) and (SelectedItems.Count > 0) then
begin
// let's move the SelectedItems a set amount
case KeyCode of
VK_UP : aMoveBy := Point(0, -cMoveAmount);
VK_DOWN : aMoveBy := Point(0, cMoveAmount);
VK_LEFT : aMoveBy := Point(-cMoveAmount, 0);
VK_RIGHT : aMoveBy := Point(cMoveAmount, 0);
end;
for AItem in SelectedItems do
begin
if canMove in AItem.Options then
begin
AItem.FDrawOffset := aMoveBy;
Aitem.UpdateToDragPosition;
end;
end;
Redraw;
// do I need to eliminate the key press ?
end else
inherited;
end;
procedure TDesignBox.CNKeyUp(var Message: TWMKeyUp);
begin
end;
constructor TDesignBox.Create(AOwner: TComponent);
begin
inherited;
ControlStyle := [csAcceptsControls, csCaptureMouse, csClickEvents,
csSetCaption, csDoubleClicks, csPannable, csGestures];
AutoScroll := True;
HorzScrollBar.Tracking := True;
VertScrollBar.Tracking := True;
fDrawClass := TDesignBoxItemRectangle; // default
FCanvas := TDesignBoxCanvas.Create(Self);
FItems := TDesignBoxItemList.Create(Self);
FSelectedItems := TDesignBoxItemList.Create(Self);
FUndoList := TDesignUndoList.Create(Self);
FGridOptions := TDesignBoxGridOptions.Create(Self);
FRulerOptions := TDesignBoxRulerOptions.Create(Self);
fMouseInteraction := TDesignBoxMouseInteractionOptions.Create;
FSelectedItems.OwnsObjects := False;
FPageSizeMM.Width := 100;
FPageSizeMM.Height := 100;
FBackgroundColor := clSilver;
FPageColor := clWhite;
FBorderStyle := bsSingle;
fScalePercent := 100;
DoubleBuffered := True;
FMode := dbmSelect;
FUpdateCount := 0;
FCanvas.Left := 0;
FCanvas.Top := 0;
FWantTabs := TRUE;
FAllowTextEdit := TRUE;
self.TabStop := TRUE;
FCanvas.Parent := Self;
end;
procedure TDesignBox.CreateParams(var Params: TCreateParams);
const
BorderStyles: array[TBorderStyle] of DWORD = (0, WS_BORDER);
begin
inherited CreateParams(Params);
with Params do
begin
Style := Style or BorderStyles[FBorderStyle];
if NewStyleControls and Ctl3D and (FBorderStyle = bsSingle) then
begin
Style := Style and not WS_BORDER;
ExStyle := ExStyle or WS_EX_CLIENTEDGE;
end;
end;
end;
destructor TDesignBox.Destroy;
begin
FCanvas.Free;
FItems.Free;
//FBuffer.Free;
FSelectedItems.Free;
FUndoList.Free;
FGridOptions.Free;
FRulerOptions.Free;
fMouseInteraction.Free;
inherited;
end;
function TDesignBox.GetPageHeightMM: integer;
begin
Result := FPageSizeMM.Height;
end;
function TDesignBox.GetPageSizeMu: TSize;
begin
result.Width := FPageSizeMM.Width * 1000;
result.Height := fPageSizeMM.Height * 1000;
end;
function TDesignBox.GetPageWidthMM: integer;
begin
Result := FPageSizeMM.Width;
end;
function TDesignBox.GetScale: extended;
begin
result := fScalePercent / 100;
end;
function TDesignBox.GetSelectedItems: TDesignBoxItemList;
var
AItem: TDesignBoxBaseItem;
begin
Result := FSelectedItems;
FSelectedItems.Clear;
for AItem in FItems do
begin
if AItem.Selected then
Result.Add(AItem);
end;
end;
procedure TDesignBox.KeyDown(var Key: Word; Shift: TShiftState);
var
AItem : TDesignBoxBaseItem;
aText : String;
itext : IDesignTextEditor;
begin
if (SelectedItems.Count = 1) then
begin
AItem := SelectedItems[0];
// HANDLE del/backspace key
if Supports(AItem, IDesignTextEditor, iText) then
begin
if (canEdit in AItem.Options) and (AllowTextEdit) then
begin
aText := iText.text;
if ((Key = VK_BACK) or (Key = VK_DELETE)) then
begin
// remove one character
aText := Copy(aText, 1, Length(aText)-1);
end
else if (ssCtrl in Shift) then
begin
// cut copy paste shortcuts
if Key = Ord('C') then
Clipboard.AsText := aText
else
if Key = Ord('X') then
begin
ClipBoard.AsText := aText;