How do I find Mouse press and hold?

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I need to continuously execute a function (for operation) in my MFC doc-view application while press and hold one of my toolbar button (zoom button) using left mouse button.
How can I track press and hold of a mouse left button? is any standard method for that?

I tried to implement if using a flag which set on left mouse down (OnLButtonDown)and clear on
left mouse up (OnLButtonUp) and checking it's status inside a while loop in toolbar button handler (OnZoomIn) function, but the while loop not terminating mouse button up.
My code is as follows

BOOL blMouseLButtonStatus;
int nZoom;

void OnLButtonDown(UINT nFlags, CPoint point);
{
blMouseLButtonStatus = true;

}
void OnLButtonUp(UINT nFlags, CPoint point);
{
blMouseLButtonStatus = false;
}
void OnZoomIn()
{
while(blMouseLButtonStatus )
{
nZoom += 1;
}
}

Have a method to terminate execution of above OnZoomIn() function on mouse button up event?
I think have to incorporate threading for even handling, am I right?

Posted 19-Mar-14 0:41am

the vacuum

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C3D1 · Accepted Answer · 2014-03-19T00:59:00

Solution 1

in OnLButtonDown you call ::SetCapture()and in OnLButtonUp you call ::ReleaseCapture().

So you get all Mouse Messages while the capture is set

For example:

C++

MyClass::OnLButtonDown(UINT nFlags,CPoint point)
{
    ::SetCapture(this->m_hWnd);
}

MyClass::OnLButtonUp(UINT nFlags,CPoint point )
{
    ::ReleaseCapture();
}

MyClass::OnMouseMove(UINT nFlags, CPoint point)
{
    // Your code here
}

Or see here[^].

Posted 19-Mar-14 0:59am

C3D1

Updated 19-Mar-14 1:06am

v2

Comments

the vacuum 20-Mar-14 5:00am

I tried that, but the mouse click event in toolbar is not forwarding to my view class..

C3D1 20-Mar-14 5:30am

Maybe you could inherit the toolbar to have your own customizable toolbar and then in your custom toolbar you could send these messages directly to your view class