urllabel.pas

LABEL的URL连接

unit URLLabel;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, StdCtrls, ShellAPI;

type
  TURLLabel = class(TCustomLabel)
  private
    FLinkColor: TColor;
    FDecoration: Boolean;
    FURL: string;
    FOnMouseLeave: TNotifyEvent;
    FOnMouseEnter: TNotifyEvent;
    procedure SetLinkColor(Value: TColor);
    procedure SetDecoration(Value: Boolean);
    procedure SetURL(const Value: string);
    procedure CMMouseEnter(var Message: TMessage); message CM_MOUSEENTER;
    procedure CMMouseLeave(var Message: TMessage); message CM_MOUSELEAVE;
  protected
    procedure Click; override;
  public
    constructor Create(AOwner: TComponent); override;
  published
    property LinkColor: TColor read FLinkColor write SetLinkColor;
    property Decoration: Boolean read FDecoration write SetDecoration;
    property URL: string read FURL write SetURL;
    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;
    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 OnMouseEnter: TNotifyEvent read FOnMouseEnter write FOnMouseEnter;
    property OnMouseLeave: TNotifyEvent read FOnMouseLeave write FOnMouseLeave;
    property OnStartDock;
    property OnStartDrag;
  end;

procedure Register;

implementation

procedure Register;
begin
  RegisterComponents('Custom', [TURLLabel]);
end;

procedure TURLLabel.CMMouseEnter(var Message: TMessage);
begin
  inherited;
  if FDecoration then
    Font.Style := Font.Style + [fsUnderline];
  if Assigned(FOnMouseEnter) then
    FOnMouseEnter(Self);
end;

procedure TURLLabel.CMMouseLeave(var Message: TMessage);
begin
  inherited;
  if FDecoration then
    Font.Style := Font.Style - [fsUnderline];
  if Assigned(FOnMouseLeave) then
    FOnMouseLeave(Self);
end;

constructor TURLLabel.Create(AOwner: TComponent);
begin
  inherited;
  Font.Color := clBlue;
  FLinkColor := clBlue;
  FDecoration := True;
  FURL := 'http://cyberian.myetang.com;mailto:[e-mail]';
  Cursor := crHandPoint;
  Transparent := True;
  Caption := FURL;
end;

procedure TURLLabel.SetLinkColor(Value: TColor);
begin
  if Value <> FLinkColor then
    FLinkColor := Value;
end;

procedure TURLLabel.SetDecoration(Value: Boolean);
begin
  if Value <> FDecoration then
    FDecoration := Value;
end;

procedure TURLLabel.SetURL(const Value: string);
begin
  if Value <> FURL then
    FURL := Value;
end;

procedure TURLLabel.Click;
begin
  ShellExecute(GetDesktopWindow, 'open', PChar(FURL), nil, nil, SW_SHOWNORMAL);
  inherited;
end;

end.