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SizeGrip Problem or Bug [message #15001]

Tue, 25 March 2008 03:43

huanghuan
Messages: 10
Registered: December 2007

Promising Member

void SizeGrip::LeftDown(Point p, dword flags)
{
	TopWindow *q = dynamic_cast<TopWindow *>(GetTopCtrl());
	if(!q || q->IsMaximized() || !q->IsSizeable()) return;
#ifdef PLATFORM_WIN32
	HWND hwnd = q->GetHWND();
	if(hwnd) {
		::SendMessage(hwnd, WM_SYSCOMMAND, 0xf008, MAKELONG(p.x, p.y));
		::SendMessage(hwnd, WM_LBUTTONUP, 0, MAKELONG(p.x, p.y));
	}
#endif

1. Why send these two message to the top window, and why 0xf008 ?
2. Maybe there is a bug in the second param make from "p". In a case, when SizeGrip leftdown, the ctrl in this window at the topleft will be also receive a leftdown call. These two p values are relative.

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Re: SizeGrip Problem or Bug [message #15013 is a reply to message #15001]

Tue, 25 March 2008 22:32

mirek
Messages: 14255
Registered: November 2005

Ultimate Member

This is an undocumented way how to tell Win32 it should start window resize loop.

Mirek

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Re: SizeGrip Problem or Bug [message #15017 is a reply to message #15013]

Wed, 26 March 2008 07:16

jerry
Messages: 4
Registered: March 2008

Junior Member

I am a friend of Mr. huanghuan's.

The problem is:

>> ::SendMessage(hwnd, WM_SYSCOMMAND, 0xf008, MAKELONG(p.x, p.y));
>> ::SendMessage(hwnd, WM_LBUTTONUP, 0, MAKELONG(p.x, p.y));

'p' is a relative position to SizeGrip its self, send it to hwnd?
It's not problem? Laughing

6301079821bb4e47c5dfeea81d7a2804

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Re: SizeGrip Problem or Bug [message #15019 is a reply to message #15017]

Wed, 26 March 2008 08:52

mirek
Messages: 14255
Registered: November 2005

Ultimate Member

Yes, you are problably correct. Anyway, my guts feeling is that it would work with 0 instead too Wink

However, going to fix it.

Mirek

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Re: SizeGrip Problem or Bug [message #15079 is a reply to message #15019]

Fri, 28 March 2008 18:46

huanghuan
Messages: 10
Registered: December 2007

Promising Member

thank you.
BTW, as you words IF code like this:

::SendMessage(hwnd, WM_SYSCOMMAND, 0xf008, MAKELONG(0, 0));
::SendMessage(hwnd, WM_LBUTTONUP, 0, MAKELONG(0, 0));

maybe a leftup sended to the topwindow. Then if a ctrl there at (0,0) and accept this mouse event ...
So I think a relative location should be calculated.

In this leftdown function, as "SendMessage" work, the leftup will be called. It is a little strange.

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Re: SizeGrip Problem or Bug [message #15082 is a reply to message #15079]

Fri, 28 March 2008 21:37

mirek
Messages: 14255
Registered: November 2005

Ultimate Member

Ops, I should have checked before... but what you are quoting is from 2007.1 U++, right?

Current code is:

void SizeGrip::LeftDown(Point p, dword flags)
{
	TopWindow *q = dynamic_cast<TopWindow *>(GetTopCtrl());
	if(!q || q->IsMaximized() || !q->IsSizeable()) return;
#ifdef PLATFORM_WIN32
	HWND hwnd = q->GetHWND();
	p = GetMousePos() - q->GetRect().TopLeft();
	if(hwnd) {
		::SendMessage(hwnd, WM_SYSCOMMAND, 0xf008, MAKELONG(p.x, p.y));
		::SendMessage(hwnd, WM_LBUTTONUP, 0, MAKELONG(p.x, p.y));
	}

So it looks like I has been fixed already...

Mirek

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