Solved

Best way to draw a rectangle around a control (TShape hides behind)

Posted on 2009-05-04
7
433 Views
Last Modified: 2013-11-22
When the user hovers the mouse over a TButton (OnMouseEnter) I want to draw a box around it (actually around a few buttons).
The problem with using a TShape is that it is not a TWinControl - so it will always appear BEHIND things like TPanels, TButtons etc.
I am busy working with another solution that draws on the "DeskTopWindow" canvas, but I'm sure there must be a more direct way (such as using the Form's Canvas) but I can't seem to get it right.

Some help would be appreciated.
0
Comment
Question by:rfwoolf
  • 4
  • 2
7 Comments
 
LVL 37

Assisted Solution

by:Geert Gruwez
Geert Gruwez earned 250 total points
ID: 24302086
why not use a bevel control ?
and then just set the bevel visible property when hovering to true
0
 
LVL 37

Assisted Solution

by:Geert Gruwez
Geert Gruwez earned 250 total points
ID: 24302168
0
 
LVL 37

Assisted Solution

by:Geert Gruwez
Geert Gruwez earned 250 total points
ID: 24302192
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 37

Assisted Solution

by:Geert Gruwez
Geert Gruwez earned 250 total points
ID: 24302521
i used that uHoverHook unit to create a sample with 2 bevels and 3 buttons ...
unit Unit1;
 

interface
 

uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls, ExtCtrls, uHoverHook, ComCtrls;
 

type

  TForm1 = class(TForm)

    Panel1: TPanel;

    Panel2: TPanel;

    Button1: TButton;

    Button2: TButton;

    Button3: TButton;

    Bevel1: TBevel;

    Bevel2: TBevel;

    procedure FormCreate(Sender: TObject);

    procedure FormDestroy(Sender: TObject);

  private

    fHover: THoverHook;

    procedure HoverMouseOver(Sender: TObject; Shift: TShiftState; X,

      Y: Integer);

    procedure OnHoverEnter(Sender: TObject);

    procedure OnHoverLeave(Sender: TObject);

  protected

    procedure WndProc(var Message: TMessage); override;

  public

  end;
 

var

  Form1: TForm1;
 

implementation
 

{$R *.dfm}
 

procedure TForm1.FormCreate(Sender: TObject);

begin

  //fHover := THoverHook.Create(HoverMouseOver, True);

  fHover := THoverHook.Create;

  fHover.OnMouseMove := HoverMouseOver;

  fHover.StartHook;

  fHover.AddToHook(Button1);

  fHover.AddToHook(Button2);

  fHover.AddToHook(Button3);

end;
 

procedure TForm1.HoverMouseOver(Sender: TObject; Shift: TShiftState; X,

  Y: Integer);

begin

  Bevel1.Visible := (Sender = Button1) or (Sender = Button3);

  Bevel2.Visible := (Sender = Button2);

end;
 

procedure TForm1.FormDestroy(Sender: TObject);

begin

  FreeAndNil(fHover);

end;
 

procedure TForm1.WndProc(var Message: TMessage);

var X: TObject;

begin

  inherited WndProc(Message);

  if (Message.Msg = CM_MOUSEENTER) or (Message.Msg = CM_MOUSELEAVE) then

  begin

    X := ControlAtPos(Mouse.CursorPos, False, True);

    if Message.Msg = CM_MOUSEENTER then

      OnHoverEnter(X)

    else

      OnHoverLeave(X);

  end;

end;
 

procedure TForm1.OnHoverEnter(Sender: TObject);

begin

end;
 

procedure TForm1.OnHoverLeave(Sender: TObject);

begin

  Bevel1.Visible := False;

  Bevel2.Visible := False;

end;
 

end.

Open in new window

0
 
LVL 13

Accepted Solution

by:
rfwoolf earned 0 total points
ID: 24309268
Hi Geert

The bevel solution is unideal because Bevels are not transparent. Of course you could put the bevels behind the buttons, but that is unideal in my case because I have some buttons that fit exactly onto a panel.

I am not sure why everyone is obsessed with 'hovering' in those links you gave me - I can just use the MouseEnter and the MouseLeave events for buttons to detect when the mouse is hovering over the button and when it is not.

And so again it looks like my best solution is to draw on the form's canvas, but that is creating a huge headache because of the titlebar and border!!


Aurrrghh.
0
 
LVL 26

Assisted Solution

by:EddieShipman
EddieShipman earned 250 total points
ID: 24549098
There is a set of controls written by an ex-colleague calle Res-cue controls. They have this capability and you can
learn how he does it and do it with your own controls. I can attach them if you'd like...
0
 
LVL 26

Assisted Solution

by:EddieShipman
EddieShipman earned 250 total points
ID: 24549142
From his help file:
"The Focus Technology is a powerful programming technique that allows developers to give a visual cue when a control receives focus.  No more searching for the control that has focus, our Focus Technology draws a rectangle around the control that has focus and can even change the Font attributes of a label for the control.  Developers are given the flexibility to change the appearance of the rectangle by providing many properties that can be altered such as spacing, color, 3D, etc.  In addition, we provide events for when a focus rectangle and label are about to be painted or removed from the screen so that developers can provide other visual cues to the user as to which control has focus.

Another powerful feature of our Focus Technology is the ability to use this technology on any TWinControl.  Thats right, you dont have to replace your current controls in your application to use the great feature.  Simply place a TrscMasterFocus component on a form and select the controls that you want to have this capability.  It is as simple as that."

0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
This video demonstrates how to create an example email signature rule for a department in a company using CodeTwo Exchange Rules. The signature will be inserted beneath users' latest emails in conversations and will be displayed in users' Sent Items…
Need to grow your business through quality cloud solutions? With everything required to build a cloud platform and solution, you may feel like the distance between you and the cloud is quite long. Help is here. Spend some time learning about the Con…

947 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

23 Experts available now in Live!

Get 1:1 Help Now