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Re: capture mouse and limit all events to window [message #47469 is a reply to message #47441]

Fri, 20 January 2017 08:14

slashupp
Messages: 231
Registered: July 2009

Experienced Member

I managed to achieve exclusive grab of mouse by modifying Ctrl:

In CtrlCore.h
Added attribute:

    [1049]    bool bcaptureLock;

Added parameters:

    [1050]    bool SetCapture(bool bLock=false);
    [1051]    bool ReleaseCapture(bool bUnlock=false);

In Ctrl.cpp (ctor)

    [596]    bcaptureLock=false;

In CtrlMouse.cpp (changed lines marked with: ///mais )

[301]
Image Ctrl::MEvent0(int e, Point p, int zd)
{
	GuiLock __;
	LLOG("MEvent0 " << Name() << " event: " << FormatIntHex(e, 0) << " point:" << p);
	Ptr<Ctrl> _this = this;
	mousepos = p;
	dword mm = 0;
	if((e & ACTION) == DOUBLE)
		mm |= K_MOUSEDOUBLE;
	if((e & ACTION) == TRIPLE)
		mm |= K_MOUSETRIPLE;
	
	if (bcaptureLock) return MouseEventH(e, p, zd, GetMouseFlags() | mm); ///mais...
		
	Rect view = GetView();
	if(mouseCtrl != this) {
        ...

[587]
Image Ctrl::DispatchMouseEvent(int e, Point p, int zd) {
	GuiLock __;
#if defined(flagWINGL) || defined(flagLINUXGL)
	if(!IsEnabled() && this != (Ctrl*) &infoPanel)
		return Image::Arrow();
#else
	if(!IsEnabled())
		return Image::Arrow();
#endif

	if(captureCtrl && captureCtrl->bcaptureLock) ///mais...
	{
		if (captureCtrl!=this) return captureCtrl->DispatchMouseEvent(e, p, zd);
		return captureCtrl->MEvent0(e, p, zd);
	}

	if(captureCtrl && captureCtrl != this && captureCtrl->IsMouseActive())
        ...

[618]
bool Ctrl::SetCapture(bool bLock) { ///mais...
	GuiLock __;
	ReleaseCtrlCapture();
	if(!GetTopCtrl()->SetWndCapture()) return false;
	captureCtrl = mouseCtrl = this;
	bcaptureLock=bLock; ///mais...
	return true;
}

[628]
bool Ctrl::ReleaseCapture(bool bUnlock) { ///mais...
	GuiLock __;
	if (bcaptureLock) bcaptureLock=!bUnlock; ///mais...
	return this == captureCtrl && ReleaseCtrlCapture();
}

[634]
bool Ctrl::ReleaseCtrlCapture() {
	GuiLock __;
	if (captureCtrl && captureCtrl->bcaptureLock) return false; ///mais...
	if(captureCtrl) {
		captureCtrl->CancelMode();
		Ctrl *w = captureCtrl->GetTopCtrl();
		captureCtrl = NULL;
		if(w->HasWndCapture()) {
			w->ReleaseWndCapture();
			return true;
		}
	}
	captureCtrl = NULL;
	return false;
}

All mouse events now goes to my control exclusively (for testing I use K_ESCAPE hotkey to release)

These changes 'should' not affect any other uses of the functions. - mirek, what say you?

I'm looking at 'XWarpPointer()' to force pointer to remain physically within my control's view-area
(don't know what MSWindows would require)

Adding test-code:

Attachment: main.cpp
(Size: 2.14KB, Downloaded 287 times)

[Updated on: Fri, 20 January 2017 09:43]

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