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| unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TMyHintData = record
FontSize: Integer;
end;
TMyHintWindow = class(THintWindow)
public
function CalcHintRect(MaxWidth: Integer; const AHint: string; AData: TCustomData): TRect; override;
end;
TMyButton = class(TButton)
private
procedure CMHintShow(var AMessage: TCMHintShow); message CM_HINTSHOW;
public
FMyHintData: TMyHintData;
constructor Create(AOwner: TComponent); override;
end;
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
private
MyButton: TMyButton;
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
TMyButton(Sender).FMyHintData.FontSize:=44;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
MyButton:=TMyButton.Create(Form1);
MyButton.Parent:=Form1;
MyButton.Caption:='Test';
MyButton.Left:=100;
MyButton.Top:=100;
MyButton.ShowHint:=true;
MyButton.OnClick:=Button1Click;
end;
function TMyHintWindow.CalcHintRect(MaxWidth: Integer; const AHint: string; AData: TCustomData): TRect;
begin
Canvas.Font.Size:=TMyHintData(AData^).FontSize;
Result:=inherited;
end;
constructor TMyButton.Create(AOwner: TComponent);
begin
inherited;
FMyHintData.FontSize:=25;
end;
procedure TMyButton.CMHintShow(var AMessage: TCMHintShow);
begin
inherited;
AMessage.HintInfo.HintData:=@FMyHintData;
AMessage.HintInfo.HintWindowClass:=TMyHintWindow;
AMessage.HintInfo.HintStr:='My custom hint';
end;
end. |
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