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Mouse Wheel Scrolling UI Event


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Hey guys,

I needed to be able to scroll on the ui with the mouse wheel and I thought it will be useful for others too so here's what to do.

 

EterPythonLib

PythonWindow.h

Add

 

virtual BOOL	OnMouseWheel(int nLen);

 

after like

 

virtual BOOL	OnMouseMiddleButtonUp();

 

In PythonWindow.cpp add the following function:

 

BOOL CWindow::OnMouseWheel(int nLen)
{
  long lValue;
  return PyCallClassMemberFunc(m_poHandler, "OnMouseWheel", Py_BuildValue("(i)", nLen), &lValue) && 0 != lValue;
}

 

In PythonWindowManager.h add

 

bool		RunMouseWheel(int nLen);

 

after like

 

void		RunMouseMiddleButtonUp(long x, long y);

 

In PythonWindowManager.cpp add the definition somewhere:

 

bool CWindowManager::RunMouseWheel(int nLen)
{
  CWindow* pWin = GetPointWindow();
  while (pWin)
  {
    if (pWin->OnMouseWheel(nLen))
      return true;
    pWin = pWin->GetParent();
  }
  return false;
}

 

UserInterface

In PythonApplicationEvent.cpp override the following function:

 

void CPythonApplication::OnMouseWheel(int nLen)
{
	UI::CWindowManager& rkWndMgr = UI::CWindowManager::Instance();
	if (!rkWndMgr.RunMouseWheel(nLen))
	{
		CCameraManager& rkCmrMgr = CCameraManager::Instance();
		if (CCamera* pkCmrCur = rkCmrMgr.GetCurrentCamera())
			pkCmrCur->Wheel(nLen);
	}
}

 

Then root/ui.py and find ScrollBar class and add this function to it:

 

def OnMouseWheel(self, nLen):
		if nLen > 0:
			self.OnUp()
			return True
		elif nLen < 0:
			self.OnDown()
			return True
		return False

 

But you can use OnMouseWheel everywhere to listen to scrolling.

 

Good luck!

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