Solved

VCL Bug???

Posted on 2001-08-15
6
285 Views
Last Modified: 2010-05-18
try this code:
procedure TForm1.Image1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
   Label1.Caption:='down';
   Image1.Cursor:=crHandPoint;
end;

result:
Label1.caption changed immediately,but Image1.Cursor changed after Image1MouseUp event,why???bug???

How to Change Cursor immediately???
0
Comment
Question by:sundayboys
6 Comments
 

Expert Comment

by:comptebidon81
ID: 6387929
There has to be an OnMouseOver event in order for your programm to detect that te mouse is currently over the Image. You could try to use Screen.Cursor := crHandPoint and set the last cursor back after. This will take effect immediately.

GunDamn
0
 
LVL 3

Expert Comment

by:rondi
ID: 6388428

Try repainting the image/cursor ?
0
 
LVL 33

Expert Comment

by:Slick812
ID: 6389241
I've had some sucess with other controls by calling Appication.ProcessMessages right after the "Control1.Cursor := crHandPoint" , don't remember trying it on a TImage.
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 4

Accepted Solution

by:
DMN earned 30 total points
ID: 6390640
You can use Screen.Cursor instead of Image1.Cursor:

procedure TForm1.Image1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  Label1.Caption:='down';
  Screen.Cursor:=crHandPoint;
end;
0
 
LVL 21

Expert Comment

by:gemarti
ID: 6390692
Well your question really is why is this happening and is it a bug right?

I don't think it is a bug. You see the OnMouseDown event for the Image object  is receiving the event, thus it is the handler. Before it's property (Cursor) can be changed the memory must be flushed and replaced with the updated property values.

I think this is why you don't actually see the cursor change until you release the mouse button. Once you release the mouse button the component is no longer receiving a WM_MOUSEDOWN Message and it can therefore update it's memory.

Probably not the most technical explaination...but this is what is happening.

Your other question was answered. To change the cursor immediately you should do so in an OnMouseMove event.

GEM
0
 
LVL 12

Expert Comment

by:rwilson032697
ID: 6390994
You can force the cursor to change immeditately by doing this:

var
  CPos : TPoint;

...

  // Force cursor change
  GetCursorPos(CPos);
  SetCursorPos(CPos.X, CPos.y);

Cheers,

Raymond.
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

Suggested Solutions

Introduction The parallel port is a very commonly known port, it was widely used to connect a printer to the PC, if you look at the back of your computer, for those who don't have newer computers, there will be a port with 25 pins and a small print…
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…
Along with being a a promotional video for my three-day Annielytics Dashboard Seminor, this Micro Tutorial is an intro to Google Analytics API data.
Migrating to Microsoft Office 365 is becoming increasingly popular for organizations both large and small. If you have made the leap to Microsoft’s cloud platform, you know that you will need to create a corporate email signature for your Office 365…

911 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

16 Experts available now in Live!

Get 1:1 Help Now