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Drag of mouse while left button is pressed. [message #27625]

Mon, 26 July 2010 18:23

281264
Messages: 272
Registered: June 2010
Location: Spain

Experienced Member

Hi,

Which Ctrl function is invoked when and during the left button of the mouse is pressed? I have had a look on LeftDrag and LeftHold; are one of these suitable for what I want?

Cheers,

Javier

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Re: Drag of mouse while left button is pressed. [message #27628 is a reply to message #27625]

Mon, 26 July 2010 23:10

koldo
Messages: 3459
Registered: August 2008

Senior Veteran

281264 wrote on Mon, 26 July 2010 18:23

Hi,

Which Ctrl function is invoked when and during the left button of the mouse is pressed? I have had a look on LeftDrag and LeftHold; are one of these suitable for what I want?

Cheers,

Javier

Hello Javier

I use these functions instead:

	virtual void  LeftDown(Point, dword);
	virtual void  LeftUp(Point, dword);
	virtual void  MouseMove(Point, dword);
	virtual void  MouseLeave(Point, dword);

in a class derived of a Ctrl.

Best regards
Iñaki

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Re: Drag of mouse while left button is pressed. [message #27639 is a reply to message #27628]

Tue, 27 July 2010 12:11

mrjt
Messages: 705
Registered: March 2007
Location: London

Contributor

The code you want is something like:

void LeftDown(Point p, dword keyflags)
{
   SetCapture(); 
   // All mouse events are now directed to this ctrl until ReleaseCapture is called
}

void MouseMovePoint p, dword keyflags)
{
   if (HasCapture())
      // Left mouse is depressed
   else
      // No button pressed
}

void LeftDown(Point p, dword keyflags)
{
   ReleaseCapture(); 
}

There are loads of other ways of doing it, but this is the cleanest for simple behaviour. You can also use LeftHold/LeftDrag but they have a slight delay before being triggered.

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