Board index » cppbuilder » Mouse Clicks

2005-02-06 02:51:28 PM
cppbuilder80
I've overriden a controls WndProc where I'm listening for mouse
clicks because I want to add OnMouseDown, OnMouseUp and
OnDblClick events to the object.
My problem is that if I double click the object, WM_LBUTTONUP
is getting processed twice. If I comment out WM_LBUTTONUP,
WM_LBUTTONDBLCLK is properly detected. So ... it's a timing
issue.
How does one deal with this?
~ JD
 

"JD" < XXXX@XXXXX.COM >wrote in message
void __fastcall TForm1::MyWndProc(Messages::TMessage &Message)
{
static unsigned int UpOrDown(WM_LBUTTONUP);
switch (Message.Msg)
{
case WM_LBUTTONDOWN:
Memo1->Lines->Add("LB Down") ;
UpOrDown = WM_LBUTTONDOWN;
break;
case WM_LBUTTONUP:
if (UpOrDown == WM_LBUTTONUP)
break;
Memo1->Lines->Add("LB Up");
UpOrDown = WM_LBUTTONUP;
break;
case WM_LBUTTONDBLCLK: Memo1->Lines->Add("LB Dbl Click");
};
OldWndProc(Message);
}
HTH
Simon.
 

"JD" < XXXX@XXXXX.COM >wrote in message
and the necessary message handlings to trigger them. The only thing you
have to do yourself, if anything, is to promote the existing events from
protected to published.
clearly documented by Microsoft as such:
Only windows that have the CS_DBLCLKS style can receive WM_LBUTTONDBLCLK
messages, which Windows generates whenever the user presses, releases, and
again presses the left mouse button within the system's double-click time
limit. Double-clicking the left mouse button actually generates four
messages: WM_LBUTTONDOWN, WM_LBUTTONUP, WM_LBUTTONDBLCLK, and WM_LBUTTONUP
again.
I've described this behavior before in terms of the VCL:
groups-beta.google.com/group/borland.public.cppbuilder.students/msg/24b79ce74eeaf310
Gambit
 

{smallsort}

"Remy Lebeau \(TeamB\)" < XXXX@XXXXX.COM >wrote:
TComponent right? I know that sounds wrong ... given that I
want mouse events but in reality I'm hooking into the form's
WndProc for WM_click messages.
Thank you.
~ JD