// Setup splitter position.
void ClsSplitter::SetSplitterPosition( int nSplitPos )
{
// Get the splitter rectangle. If it is
// empty we use the parent client rectangle.
ClsRect rc = m_SplitRect;
if ( rc.IsEmpty()) GetParent()->GetClientRect( rc );
// Horizontal or vertical?
int nMaxPos = m_bIsHorizontal ? rc.Width() : rc.Height();
nMaxPos -= m_nMinPane2 + SPLITTER_SIZE;
// Make sure the splitter stays in range.
if ( nSplitPos > nMaxPos ) nSplitPos = nMaxPos;
if ( nSplitPos < m_nMinPane1 ) nSplitPos = m_nMinPane1;
// Did it change?
if ( m_nPosition != nSplitPos )
{
// If the splitter bar is visible we render
// it again at the same position to make it
// disappear.
if ( m_bIsVisible ) DrawSplitterBar();
// Setup the new position.
m_nPosition = nSplitPos;
// Draw the splitter bar.
DrawSplitterBar();
}
}
/**
* @param hdc - drawing context.
*/
void CSplitter::DrawSplitter(HDC hdc) const
{
_ASSERTE(m_hwnd != NULL);
DrawSplitterBar(hdc);
DrawPanel(hdc, 0);
DrawPanel(hdc, 1);
}
// Window procedure override.
LRESULT ClsSplitter::WindowProc( UINT uMsg, WPARAM wParam, LPARAM lParam )
{
switch ( uMsg )
{
case WM_ERASEBKGND:
{
// Fill the entire client rectangle
// with the same color as the button
// background.
ClsBrush b( ::GetSysColor( COLOR_BTNFACE ));
::FillRect(( HDC )wParam, GetClientRect(), b );
return 0;
}
case WM_LBUTTONDOWN:
{
// Obtain a device context and attach it.
if ( m_pDC.Attach( ::GetDC( *GetParent())))
{
// Snapshot the device context.
m_nSaveDC = m_pDC.SaveDC();
// OK?
if ( m_nSaveDC )
{
// Mark the current position.
m_nStartPosition = m_nPosition;
// Setup DC.
m_pDC.SetROP2( R2_NOTXORPEN );
m_pDC.SelectObject( m_HatchBrush );
m_pDC.SelectObject( ::GetStockObject( NULL_PEN ));
m_pDC.SetTextColor( RGB( 0, 0, 0 ));
// Capture the mouse.
SetCapture();
// We are moving the splitter.
m_bIsMoving = TRUE;
// We want the keyboard focus.
m_hFocus = ::SetFocus( *this );
// Show the track bar.
DrawSplitterBar();
return 0;
}
// Failure...
::ReleaseDC( *GetParent(), m_pDC.Detach());
}
return 0;
}
case WM_MOUSEMOVE:
// Are we moving the splitter?
if ( m_bIsMoving )
{
// Get the current mouse position.
ClsPoint p;
GetCursorPos( p );
// Map the position to our parent.
GetParent()->ScreenToClient(p);
// Get position (Horizontal or vertical).
int nPos = m_bIsHorizontal ? p.X() : p.Y();
// Set splitter position.
SetSplitterPosition( nPos );
return 0;
}
break;
case WM_GETDLGCODE:
// We want them all.
return DLGC_WANTALLKEYS;
case WM_KEYDOWN:
// Are we moving the splitter or was a key
// pressed other than escape?
if ( ! m_bIsMoving || wParam != VK_ESCAPE )
// Pass the message to the base class.
break;
// Erase the splitter if necessary.
if ( m_bIsVisible ) DrawSplitterBar();
// Restore the old position.
m_nPosition = m_nStartPosition;
// Fall through which will stop the
// mouse tracking etc.
case WM_LBUTTONUP:
// Are we moving?
if ( m_bIsMoving )
{
// Make sure we are invisible.
if ( m_bIsVisible ) DrawSplitterBar();
// Restore DC snapshot.
m_pDC.RestoreDC( m_nSaveDC );
// Release it and detach it from the object.
::ReleaseDC( *GetParent(), m_pDC.Detach());
// Release the mouse.
ReleaseCapture();
// No longer moving.
m_bIsMoving = FALSE;
// Move the panes.
MoveSplitter();
// Restore the focus.
::SetFocus( m_hFocus );
}
return 0;
case WM_SETCURSOR:
// Setup the correct cursor.
if ( m_bIsHorizontal ) SetCursor( m_hVert );
else SetCursor( m_hHorz );
return 0;
}
// Call the base class.
return ClsWindow::WindowProc( uMsg, wParam, lParam );
}
