scustomlabel.pas

AlphaControls是一个Delphi标准控件的集合

unit sCustomLabel;
{$I sDEFS.INC}

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls,
  sConst, ShellApi, sGraphUtils, sVclUtils, sUtils, sStyleSimply;


type
  TsCustomLabel = class(TCustomControl)
  private
    FFocusControl: TWinControl;
    FAlignment: TAlignment;
    FAutoSize: Boolean;
    FLayout: TTextLayout;
    FWordWrap: Boolean;
    FShowAccelChar: Boolean;
    FTransparent: Boolean;
    procedure SetAlignment(Value: TAlignment);
    procedure SetFocusControl(Value: TWinControl);
    procedure SetShowAccelChar(Value: Boolean);
    procedure SetLayout(Value: TTextLayout);
    procedure SetWordWrap(Value: Boolean);
    procedure CMTextChanged(var Message: TMessage); message CM_TEXTCHANGED;
    procedure CMFontChanged(var Message: TMessage); message CM_FONTCHANGED;
    procedure CMDialogChar(var Message: TCMDialogChar); message CM_DIALOGCHAR;
    procedure CMEnabledChanged(var Message: TMessage); message CM_ENABLEDCHANGED;
    procedure WMNclButtonDown(var Message: TMessage); message WM_LBUTTONDOWN;
    procedure WMEraseBkGND (var Message: TWMPaint); message WM_ERASEBKGND;
    procedure SetTransparent(const Value: Boolean);
  protected
    procedure AdjustBounds; dynamic;
    procedure DoDrawText(var Rect: TRect; Flags: Longint); dynamic;
    function GetLabelText: string; virtual;
    procedure Loaded; override;
    procedure Notification(AComponent: TComponent; Operation: TOperation); override;
    procedure Paint; override;
{$IFDEF DELPHI6UP}
    procedure SetAutoSize(Value: Boolean); override;
{$ELSE}
    procedure SetAutoSize(Value: Boolean); virtual;
{$ENDIF}
    function GetCurrentFont: TFont; dynamic;
    property Alignment: TAlignment read FAlignment write SetAlignment default taLeftJustify;
    property AutoSize: Boolean read FAutoSize write SetAutoSize default True;
    property FocusControl: TWinControl read FFocusControl write SetFocusControl;
    property ShowAccelChar: Boolean read FShowAccelChar write SetShowAccelChar default True;
    property Transparent: Boolean read FTransparent write SetTransparent default True;
    property Layout: TTextLayout read FLayout write SetLayout default tlTop;
    property WordWrap: Boolean read FWordWrap write SetWordWrap default False;
    procedure CMMouseEnter(var Message: TMessage); message CM_MOUSEENTER;
    procedure CMMouseLeave(var Message: TMessage); message CM_MOUSELEAVE;
    function GetParentCache : TCacheInfo;
  public
    MouseAbove: boolean;
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    property Canvas;
  end;

  TsEditLabel = class(TsCustomLabel)
  private
    function GetTop: Integer;
    function GetLeft: Integer;
    function GetWidth: Integer;
    function GetHeight: Integer;
    procedure SetHeight(const Value: Integer);
    procedure SetWidth(const Value: Integer);
  protected
    procedure AdjustBounds; override;
  public
    constructor Create(AOwner: TComponent); override;
  published
    property BiDiMode;
    property Caption;
    property Color;
    property DragCursor;
    property DragKind;
    property DragMode;
    property Font;
    property Height: Integer read GetHeight write SetHeight;
    property Left: Integer read GetLeft;
    property ParentBiDiMode;
    property ParentColor;
    property ParentFont;
    property ParentShowHint;
    property PopupMenu;
    property ShowAccelChar;
    property ShowHint;
    property Top: Integer read GetTop;
    property Transparent default True;
    property Layout;
    property WordWrap;
    property Width: Integer read GetWidth write SetWidth;
    property OnClick;
    property OnContextPopup;
    property OnDblClick;
    property OnDragDrop;
    property OnDragOver;
    property OnEndDock;
    property OnEndDrag;
    property OnMouseDown;
    property OnMouseMove;
    property OnMouseUp;
    property OnStartDock;
    property OnStartDrag;
  end;

  TsLabel = class(TsCustomLabel)
  published
    property Align;
    property Alignment;
    property Anchors;
    property AutoSize;
    property BiDiMode;
    property Caption;
    property Color;
    property Constraints;
    property DragCursor;
    property DragKind;
    property DragMode;
    property Enabled;
    property FocusControl;
    property Font;
    property ParentBiDiMode;
    property ParentColor;
    property ParentFont;
    property ParentShowHint;
    property PopupMenu;
    property ShowAccelChar;
    property ShowHint;
    property Transparent default True;
    property Layout;
    property Visible;
    property WordWrap;
    property OnClick;
    property OnContextPopup;
    property OnDblClick;
    property OnDragDrop;
    property OnDragOver;
    property OnEndDock;
    property OnEndDrag;
    property OnMouseDown;
    property OnMouseMove;
    property OnMouseUp;
    property OnStartDock;
    property OnStartDrag;
  end;

  TsWebLabel = class(TsLabel)
  private
    procedure SetHoverFont(const Value: TFont);
  protected
    FHoverFont : TFont;
    FURL : string;
    FShowMode: TsWindowShowMode;
//    FHoverCursor : TCursor;
    procedure WMLButtonDown(var Message: TWMLButtonDown); message WM_LBUTTONDOWN;
    function GetCurrentFont: TFont; override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
  published
    property HoverFont: TFont read FHoverFont write SetHoverFont;
    property ShowMode : TsWindowShowMode read FShowMode write FShowMode default soDefault;
    property URL : string read FURL write FURL;
    property Align;
    property Alignment;
    property Anchors;
    property AutoSize;
    property BiDiMode;
    property Caption;
    property Color;
    property Constraints;
    property Cursor default crHandPoint;
//    property HoverCursor : TCursor read FHoverCursor write FHoverCursor default crHandPoint;
    property DragCursor;
    property DragKind;
    property DragMode;
    property Enabled;
    property FocusControl;
    property Font;
    property ParentBiDiMode;
    property ParentColor;
    property ParentFont;
    property ParentShowHint;
    property PopupMenu;
    property ShowAccelChar;
    property ShowHint;
    property Transparent default True;
    property Layout;
    property Visible;
    property WordWrap;
    property OnClick;
    property OnContextPopup;
    property OnDblClick;
    property OnDragDrop;
    property OnDragOver;
    property OnEndDock;
    property OnEndDrag;
    property OnMouseDown;
    property OnMouseMove;
    property OnMouseUp;
    property OnStartDock;
    property OnStartDrag;
  end;

implementation

uses sMessages

{$IFNDEF ALITE}
, sPageControl
{$ENDIF};

{ TsCustomLabel }

constructor TsCustomLabel.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
//  Parent := TWinControl(AOwner);
  Width := 65;
  Height := 17; //           TLabel
  FAutoSize := True;
  FShowAccelChar := True;
//  FDoubleBuffered := True;
  FTransparent := True;
  ControlStyle := ControlStyle - [csFramed, csReplicatable] + [csSetCaption, csOpaque];
end;

function TsCustomLabel.GetLabelText: string;
begin
  if not Assigned(Parent) then Exit;
  Result := Caption;
end;

procedure TsCustomLabel.DoDrawText(var Rect: TRect; Flags: Longint);
var
  Text: string;
  cFont : TFont;
begin
  if not Assigned(Parent) then Exit;
  cFont := TFont.Create;
  try
  Text := GetLabelText;
  if (Flags and DT_CALCRECT <> 0) and ((Text = '') or FShowAccelChar and
    (Text[1] = '&') and (Text[2] = #0)) then Text := Text + ' ';
  if not FShowAccelChar then Flags := Flags or DT_NOPREFIX;
  Flags := DrawTextBiDiModeFlags(Flags);
  cFont.Assign(GetCurrentFont);
  Canvas.Font.Assign(cFont);// := GetCurrentFont;
  if not Enabled then begin
    OffsetRect(Rect, 1, 1);
    Canvas.Font.Color := clBtnHighlight;
    DrawText(Canvas.Handle, PChar(Text), Length(Text), Rect, Flags);
    OffsetRect(Rect, -1, -1);
    Canvas.Font.Color := clBtnShadow;
    DrawText(Canvas.Handle, PChar(Text), Length(Text), Rect, Flags);
  end
  else begin
    DrawText(Canvas.Handle, PChar(Text), Length(Text), Rect, Flags);
  end;
  finally
    FreeAndNil(cFont);
  end;
end;


procedure TsCustomLabel.Paint;
const
  Alignments: array[TAlignment] of Word = (DT_LEFT, DT_RIGHT, DT_CENTER);
  WordWraps: array[Boolean] of Word = (0, DT_WORDBREAK);
var
  Rect, CalcRect: TRect;
  DrawStyle: Longint;
  ci : TCacheInfo;
begin
//  inherited;
  if not Assigned(Parent) then Exit;
  if (csDestroying in ComponentState) or (csLoading in ComponentState) then Exit;
  ci := GetParentCache;
  if Transparent and ci.Ready then begin
    CalcRect := ClientRect;
    OffsetRect(CalcRect, Left + ci.X, Top + ci.Y);
    FadeRect(ci.Bmp.Canvas,
       CalcRect,
       Canvas.Handle,
       Point(0, 0),
       100,
       Color, 0, ssRectangle);
  end
  else begin
    Canvas.Brush.Color := Color;
    Canvas.Brush.Style := bsSolid;
    Canvas.FillRect(ClientRect);
  end;
  Canvas.Brush.Style := bsClear;
  Rect := ClientRect;
  DrawStyle := DT_EXPANDTABS or WordWraps[FWordWrap] or Alignments[FAlignment];
  if FLayout <> tlTop then begin
    CalcRect := Rect;
    DoDrawText(CalcRect, DrawStyle or DT_CALCRECT);
    if FLayout = tlBottom then OffsetRect(Rect, 0, Height - CalcRect.Bottom)
    else OffsetRect(Rect, 0, (Height - CalcRect.Bottom) div 2);
  end;
  DoDrawText(Rect, DrawStyle);
end;

procedure TsCustomLabel.Loaded;
begin
  if not Assigned(Parent) then Exit;
  inherited Loaded;
  AdjustBounds;
end;