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<FONT COLOR="#AOAO99">Splitter Window - "True" dynamic splitter window</FONT></H3></CENTER>
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<p>This article was contributed by <a href="mailto:Saga@gis.net">Andrew Slivker</a>. </p>
<p>If you want to implement splitter window in your MFC based application
that redraws its panes dynamically
(like Microsoft Windows Explorer does when you have IE4.0 installed)
then you can use my simple
class CDynSplitterWnd. Dragging CDynSplitterWnd splitter bar does not
show a hatched line, instead it immediately redraws itself at a new
position as well as forces all its panes to redraw themselves.
<p>To implement CDynSplitterWnd window simply:
<p>1. Change declaration of your splitter window instances to be
instances of the CDynSplitterWnd class rather than CSplitterWnd class.
<p>2. Or derive your own CSplitterWnd based classes (if you have them)
from CDynSplitterWnd instead, and
don't forget about BEGIN_MESSAGE_MAP(CYourSplitterWnd,
CDynSplitterWnd) macro.
<p>CDynSplitterWnd works best for the "1column 2 rows static
splitter" situation. If you have MFC dynamic splitters create them with
SIZE sizeMin parameter in CSplitterWnd ::Create(...) function set to
CSize(1,1) or CSize(0,0).
<PRE><TT><FONT COLOR="#990000">
// DynSplitterWnd.h file
//
class CDynSplitterWnd : public CSplitterWnd
{
// Construction
public:
CDynSplitterWnd();
// Attributes
public:
BOOL IsDynamic()
{ return m_bDynSplit; }
void SetDynamic(BOOL bDynSplit = TRUE)
{ m_bDynSplit = bDynSplit; }
// Operations
public:
// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CDynSplitterWnd)
virtual void OnInvertTracker(const CRect& rect);
virtual void StartTracking(int ht);
virtual void StopTracking(BOOL bAccept);
//}}AFX_VIRTUAL
// Implementation
public:
virtual ~CDynSplitterWnd();
protected:
CPoint m_OldPoint;
BOOL m_bDynSplit;
enum HitTestValue
{
noHit = 0,
vSplitterBox = 1,
hSplitterBox = 2,
bothSplitterBox = 3, // just for
keyboard
vSplitterBar1 = 101,
vSplitterBar15 = 115,
hSplitterBar1 = 201,
hSplitterBar15 = 215,
splitterIntersection1 = 301,
splitterIntersection225 = 525
};
// Generated message map functions
protected:
//{{AFX_MSG(CDynSplitterWnd)
afx_msg void OnMouseMove(UINT nFlags, CPoint point);
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};
#include "stdafx.h"
#include lt;afxext.h>
#include "DynSplitterWnd.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#define CX_BORDER 1
#define CY_BORDER 1
#define FAR_POINT_XY -10000
////////////////////////////////////////////////////////////////////////
/////
// CDynSplitterWnd
CDynSplitterWnd::CDynSplitterWnd()
:m_OldPoint(FAR_POINT_XY,FAR_POINT_XY),
m_bDynSplit(TRUE)
{
}
CDynSplitterWnd::~CDynSplitterWnd()
{
}
void CDynSplitterWnd::OnInvertTracker(const CRect& rect)
{
if(!m_bDynSplit)
CSplitterWnd::OnInvertTracker(rect);
else
return;
}
void CDynSplitterWnd::StartTracking(int ht)
{
if(!m_bDynSplit)
{
CSplitterWnd::StartTracking(ht);
return;
}
ASSERT_VALID(this);
if (ht == noHit)
return;
// GetHitRect will restrict 'm_rectLimit' as appropriate
GetInsideRect(m_rectLimit);
if (ht >= splitterIntersection1 && ht lt;=
splitterIntersection225)
{
// split two directions (two tracking
rectangles)
int row = (ht - splitterIntersection1) / 15;
int col = (ht - splitterIntersection1) % 15;
GetHitRect(row + vSplitterBar1, m_rectTracker);
int yTrackOffset = m_ptTrackOffset.y;
m_bTracking2 = TRUE;
GetHitRect(col + hSplitterBar1, m_rectTracker2);
m_ptTrackOffset.y = yTrackOffset;
}
else if (ht == bothSplitterBox)
{
// hit on splitter boxes (for keyboard)
GetHitRect(vSplitterBox, m_rectTracker);
int yTrackOffset = m_ptTrackOffset.y;
m_bTracking2 = TRUE;
GetHitRect(hSplitterBox, m_rectTracker2);
m_ptTrackOffset.y = yTrackOffset;
// center it
m_rectTracker.OffsetRect(0,
m_rectLimit.Height()/2);
m_rectTracker2.OffsetRect(m_rectLimit.Width()/2,
0);
}
else
{
// only hit one bar
GetHitRect(ht, m_rectTracker);
}
// steal focus and capture
SetCapture();
// set tracking state and appropriate cursor
m_bTracking = TRUE;
m_htTrack = ht;
SetSplitCursor(ht);
}
void CDynSplitterWnd::StopTracking(BOOL bAccept)
{
ASSERT_VALID(this);
if (!m_bTracking)
return;
ReleaseCapture();
// erase tracker rectangle
OnInvertTracker(m_rectTracker);
if (m_bTracking2)
OnInvertTracker(m_rectTracker2);
m_bTracking = m_bTracking2 = FALSE;
// save old active view
CWnd* pOldActiveView = GetActivePane();
// m_rectTracker is set to the new splitter position
(without border)
// (so, adjust relative to where the border will be)
m_rectTracker.OffsetRect(-CX_BORDER , -CY_BORDER);
m_rectTracker2.OffsetRect(-CX_BORDER, -CY_BORDER);
if (bAccept)
{
if (m_htTrack == vSplitterBox)
{
SplitRow(m_rectTracker.top);
}
else if (m_htTrack >= vSplitterBar1 && m_htTrack
lt;= vSplitterBar15)
{
// set row height
TrackRowSize(m_rectTracker.top,
m_htTrack - vSplitterBar1);
RecalcLayout();
}
else if (m_htTrack == hSplitterBox)
{
SplitColumn(m_rectTracker.left);
}
else if (m_htTrack >= hSplitterBar1 && m_htTrack
lt;= hSplitterBar15)
{
// set column width
TrackColumnSize(m_rectTracker.left,
m_htTrack - hSplitterBar1);
RecalcLayout();
}
else if (m_htTrack >= splitterIntersection1 &&
m_htTrack lt;= splitterIntersection225)
{
// set row height and column width
int row = (m_htTrack -
splitterIntersection1) / 15;
int col = (m_htTrack -
splitterIntersection1) % 15;
TrackRowSize(m_rectTracker.top, row);
TrackColumnSize(m_rectTracker2.left,
col);
RecalcLayout();
}
else if (m_htTrack == bothSplitterBox)
{
// rectTracker is vSplitter (splits
rows)
// rectTracker2 is hSplitter (splits
cols)
SplitRow(m_rectTracker.top);
SplitColumn(m_rectTracker2.left);
}
}
if ( (pOldActiveView == GetActivePane()) &&
(pOldActiveView != NULL)
)
SetActivePane(-1, -1, pOldActiveView);
// re-activate
}
BEGIN_MESSAGE_MAP(CDynSplitterWnd, CSplitterWnd)
//{{AFX_MSG_MAP(CDynSplitterWnd)
ON_WM_MOUSEMOVE()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
////////////////////////////////////////////////////////////////////////
/////
// CDynSplitterWnd message handlers
void CDynSplitterWnd::OnMouseMove(UINT nFlags, CPoint pt)
{
if(!m_bDynSplit)
{
CSplitterWnd::OnMouseMove(nFlags, pt);
return;
}
if (GetCapture() != this)
StopTracking(FALSE);
if (m_bTracking)
{
// move tracker to current cursor position
pt.Offset(m_ptTrackOffset); // pt is the upper
right of hit detect
// limit the point to the valid split range
if (pt.y lt; m_rectLimit.top)
pt.y = m_rectLimit.top;
else if (pt.y > m_rectLimit.bottom)
pt.y = m_rectLimit.bottom;
if (pt.x lt; m_rectLimit.left)
pt.x = m_rectLimit.left;
else if (pt.x > m_rectLimit.right)
pt.x = m_rectLimit.right;
if (m_htTrack == vSplitterBox ||
m_htTrack >= vSplitterBar1 && m_htTrack
lt;= vSplitterBar15)
{
if (m_rectTracker.top != pt.y)
{
OnInvertTracker(m_rectTracker);
m_rectTracker.OffsetRect(0, pt.y
- m_rectTracker.top);
OnInvertTracker(m_rectTracker);
}
}
else if (m_htTrack == hSplitterBox ||
m_htTrack >= hSplitterBar1 && m_htTrack
lt;= hSplitterBar15)
{
if (m_rectTracker.left != pt.x)
{
OnInvertTracker(m_rectTracker);
m_rectTracker.OffsetRect(pt.x -
m_rectTracker.left, 0);
OnInvertTracker(m_rectTracker);
}
}
else if (m_htTrack == bothSplitterBox ||
(m_htTrack >= splitterIntersection1 &&
m_htTrack lt;= splitterIntersection225))
{
if (m_rectTracker.top != pt.y)
{
OnInvertTracker(m_rectTracker);
m_rectTracker.OffsetRect(0, pt.y
- m_rectTracker.top);
OnInvertTracker(m_rectTracker);
}
if (m_rectTracker2.left != pt.x)
{
OnInvertTracker(m_rectTracker2);
m_rectTracker2.OffsetRect(pt.x -
m_rectTracker2.left, 0);
OnInvertTracker(m_rectTracker2);
}
}
OnLButtonUp(MK_LBUTTON,pt);
OnLButtonDown(MK_LBUTTON,pt);
if(m_OldPoint != pt)
{
RedrawWindow(NULL, NULL, RDW_ALLCHILDREN
| RDW_UPDATENOW);
m_OldPoint = pt;
}
}
else
{
// simply hit-test and set appropriate cursor
int ht = HitTest(pt);
SetSplitCursor(ht);
}
}
</FONT></TT></PRE>
<p><a href="dynamic_splitter.zip" tppabs="http://www.codeguru.com/splitter/dynamic_splitter.zip">Download file</a> 52K
<p>Updated 4 April 1998
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