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How to display hints on the title bar of a TForm Turn on/off line numbers in source code. Switch to Orginial background IDE or DSP color Comment or reply to this aritlce/tip for discussion. Bookmark this article to my favorite article(s). Print this article
30-Aug-02
Category
VCL-Forms
Language
Delphi 2.x
Views
102
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Publisher:
DSP, Administrator
Reference URL:
DKB
			Author: Tomas Rutkauskas

How to display hints on the title bar of a TForm

Answer:

To accomplish this you need to create a handler for the OnHint event for 
TApplication. Whenever a hint is going to fire, Delphi calls the 
TApplication.OnHint event for processing, if nothing is defined then the default 
processing occurs (i.e. the yellow tool-tip window).

To override the event, you need to define a TNotifyEvent method in your form and 
assign it to Application.OnHint. Following is sample code that demonstrates this. 
To use, create a new project and drop three buttons on the form. Then set the 
Form's ShowHint property to True. Finally enter the following code and run the 
application, when you move the mouse over the buttons, their hint will appear as 
the form's caption.

1   unit Sample1;
2   
3   interface
4   
5   uses
6     Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, 
7   StdCtrls;
8   
9   type
10    TForm1 = class(TForm)
11      Button1: TButton;
12      Button2: TButton;
13      Button3: TButton;
14      procedure FormCreate(Sender: TObject);
15    private
16      { Private declarations }
17    public
18      procedure DoHint(Sender: TObject);
19    end;
20  
21  var
22    Form1: TForm1;
23  
24  implementation
25  
26  procedure TForm1.DoHint(Sender: TObject);
27  begin
28  
29    {A hint can contain to pieces, a short and long hint separated by a pipe '|' 
30  (e.g. "Open File|Displays a file browser to select file to open". The short hint is 
31  "Open File" and the long hint is "Displays a file browser to select file to open".)
32  
33    To display the short portion, use the global method
34    GetShortHint(const Hint: string): string;
35  
36    To display the long portion, use the global method
37    GetLongHint(const Hint: string): string;}
38  
39    Caption := GetLongHint(Application.Hint);
40  end;
41  
42  procedure TForm1.FormCreate(Sender: TObject);
43  begin
44    Application.OnHint := DoHint;
45    {Assigns the form's current caption as the form's hint}
46    Hint := Caption;
47    {Assign Hints to the buttons}
48    Button1.Hint := 'Button One|This is the hint for button 1';
49    Button2.Hint := 'Button Two|This is the hint for button 2';
50    Button3.Hint := 'Button Three|This is the hint for button 3';
51  end;
52  
53  end.


			
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