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Date Posted: 20:57:15 03/23/00 Thu
Author: Michel
Subject: Re: Mouse handler
In reply to: Mahan 's message, "Mouse handler" on 15:48:54 03/23/00 Thu

Hi Mahan,

Bill is correct, you need to create a mouse handler class to capture mouse events on a TImageScrollBox. By default the TImageScrollBox needs to capture the mouse events primarily for the "drag" display mode.

Creating a mouse handler is a bit of work but it allows change the mouse behavior on the TImageScrollBox without changing the source code of the TImageScrollBox itself.

Here's a code skeleton that will show you how to get the mouse coordinates.

Create a class derived from TMouseHandler and override the MouseMove event.

EnImgScr; { for TMouseHandler }

TYourMouseHandler = class(TMouseHandler)
procedure MouseMove( const Shift : TShiftState;
const X, Y : Integer ); override;


procedure TYourMouseHandler.MouseMove(
const Shift : TShiftState;
const X, Y : Integer );
You have the X,Y coordinates of the mouse here.
The ImageScrollBox property of the TMouseHandler gives
you access to the image scroll box.

Now when you want to use you mouse handler:

ImageScrollBox.MouseMode := mmUser;
ImageScrollBox.MouseHandler := TYourMouseHandler.Create(ImageScrollBox);

Best regards,


> Hi
> Maybe this is a repost but i need to know the position
> of the mouse cursor on ImageScrollBox in order to
> stamp on the image at a certain point and i couldnt
> find variables that return X,Y for this purpose on the
> events of this control. I couldnt find OnMouseMove
> event (like the native ImageBox of delphi that returns
> the pos) although it has such property for
> MouseHandler.
> Anyway, i dont know how to get the position, can you
> please show me how can i have the coordinates (X,Y)
> when i move the mouse over the ImageScrollBox control
> by an example code.
> thanks in advance
> mahan

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