I have this code with which I can set the font size of the control hint, but I want to be able somehow to adjust it later at runtime. How can I do that ?
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TMyHintWindow = class(THintWindow)
constructor Create(AOwner: TComponent); override;
end;
TMyButton = class(TButton)
protected
procedure CMHintShow(var Message: TCMHintShow); message CM_HINTSHOW;
end;
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
private
MyButton: TMyButton;
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
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;
end;
procedure TMyButton.CMHintShow(var Message: TCMHintShow);
begin
inherited;
Message.HintInfo.HintWindowClass:=TMyHintWindow;
Message.HintInfo.HintStr:='My custom hint';
end;
constructor TMyHintWindow.Create(AOwner: TComponent);
begin
inherited;
Canvas.Font.Size:=25;
end;
end.
Since there is only one hint window instance at the time, and that instance will be created after call to
CMHintShow
, you can use class variables to do additional hint customization. Class variable is class member that is shared among all instances of the class and can be accessed directly through class type or class instance.and then you can change
FontSize
inCMHintShow
method