www.gusucode.com > VC Tree树状节点拖动示例-源码程序 > VC Tree树状节点拖动示例-源码程序/code/Tree_Drag/XTree.cpp
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// XTree.cpp : implementation file
//
#include "stdafx.h"
#include "STD.h"
#include "XTree.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#define DRAG_DELAY 60
/////////////////////////////////////////////////////////////////////////////
// CXTree
CXTree::CXTree()
{
m_bDragging = false;
}
CXTree::~CXTree()
{
}
BEGIN_MESSAGE_MAP(CXTree, CTreeCtrl)
//{{AFX_MSG_MAP(CXTree)
ON_NOTIFY_REFLECT(TVN_BEGINDRAG, OnBegindrag)
ON_WM_MOUSEMOVE()
ON_WM_LBUTTONUP()
ON_WM_LBUTTONDOWN()
ON_WM_TIMER()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CXTree message handlers
void CXTree::OnBegindrag(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
// TODO: Add your control notification handler code here
*pResult = 0;
if( (GetTickCount() - m_dwDragStart) < DRAG_DELAY )
return;
m_hItemDragS = pNMTreeView->itemNew.hItem;
m_hItemDragD = NULL;
//得到用于拖动时显示的图象列表
m_pDragImage = CreateDragImage( m_hItemDragS );
if( !m_pDragImage )
return;
m_bDragging = true;
m_pDragImage->BeginDrag ( 0,CPoint(8,8) );
CPoint pt = pNMTreeView->ptDrag;
ClientToScreen( &pt );
m_pDragImage->DragEnter ( this,pt ); //"this"将拖动操作限制在该窗口
SetCapture();
m_nScrollTimerID = SetTimer( 2,40,NULL );
}
void CXTree::OnMouseMove(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
HTREEITEM hItem;
UINT flags;
//检测鼠标敏感定时器是否存在,如果存在则删除,删除后再定时
if( m_nHoverTimerID )
{
KillTimer( m_nHoverTimerID );
m_nHoverTimerID = 0;
}
m_nHoverTimerID = SetTimer( 1,800,NULL ); //定时为 0.8 秒则自动展开
m_HoverPoint = point;
if( m_bDragging )
{
CPoint pt = point;
CImageList::DragMove( pt );
//鼠标经过时高亮显示
CImageList::DragShowNolock( false ); //避免鼠标经过时留下难看的痕迹
if( (hItem = HitTest(point,&flags)) != NULL )
{
SelectDropTarget( hItem );
m_hItemDragD = hItem;
}
CImageList::DragShowNolock( true );
//当条目被拖曳到左边缘时，将条目放在根下
CRect rect;
GetClientRect( &rect );
if( point.x < rect.left + 20 )
m_hItemDragD = NULL;
}
CTreeCtrl::OnMouseMove(nFlags, point);
}
void CXTree::OnLButtonUp(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
CTreeCtrl::OnLButtonUp(nFlags, point);
if( m_bDragging )
{
m_bDragging = FALSE;
CImageList::DragLeave( this );
CImageList::EndDrag();
ReleaseCapture();
delete m_pDragImage;
SelectDropTarget( NULL );
if( m_hItemDragS == m_hItemDragD )
{
KillTimer( m_nScrollTimerID );
return;
}
Expand( m_hItemDragD,TVE_EXPAND );
HTREEITEM htiParent = m_hItemDragD;
//如果是由父节点拖向子节点
while( (htiParent = GetParentItem(htiParent)) != NULL )
{
if( htiParent == m_hItemDragS )
{
//建立一个临时节点以完成操作
HTREEITEM htiNewTemp = CopyBranch( m_hItemDragS,NULL,TVI_LAST );
HTREEITEM htiNew = CopyBranch( htiNewTemp,m_hItemDragD,TVI_LAST );
DeleteItem( htiNewTemp );
SelectItem( htiNew );
KillTimer( m_nScrollTimerID );
return;
}
}
HTREEITEM htiNew = CopyBranch( m_hItemDragS,m_hItemDragD,TVI_LAST );
DeleteItem( m_hItemDragS );
SelectItem( htiNew );
KillTimer( m_nScrollTimerID );
}
}
HTREEITEM CXTree::CopyItem(HTREEITEM hItem, HTREEITEM htiNewParent, HTREEITEM htiAfter)
{
TV_INSERTSTRUCT tvstruct;
HTREEITEM hNewItem;
CString sText;
//得到源条目的信息
tvstruct.item.hItem = hItem;
tvstruct.item.mask = TVIF_CHILDREN|TVIF_HANDLE|TVIF_IMAGE|TVIF_SELECTEDIMAGE;
GetItem( &tvstruct.item );
sText = GetItemText( hItem );
tvstruct.item.cchTextMax = sText.GetLength ();
tvstruct.item.pszText = sText.LockBuffer ();
//将条目插入到合适的位置
tvstruct.hParent = htiNewParent;
tvstruct.hInsertAfter = htiAfter;
tvstruct.item.mask = TVIF_IMAGE|TVIF_SELECTEDIMAGE|TVIF_TEXT;
hNewItem = InsertItem( &tvstruct );
sText.ReleaseBuffer ();
//限制拷贝条目数据和条目状态
SetItemData( hNewItem,GetItemData(hItem) );
SetItemState( hNewItem,GetItemState(hItem,TVIS_STATEIMAGEMASK),TVIS_STATEIMAGEMASK);
return hNewItem;
}
//拷贝分支
HTREEITEM CXTree::CopyBranch(HTREEITEM htiBranch, HTREEITEM htiNewParent, HTREEITEM htiAfter)
{
HTREEITEM hChild;
HTREEITEM hNewItem = CopyItem( htiBranch,htiNewParent,htiAfter );
hChild = GetChildItem( htiBranch );
while( hChild != NULL )
{
CopyBranch( hChild,hNewItem,htiAfter );
hChild = GetNextSiblingItem( hChild );
}
return hNewItem;
}
void CXTree::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
//处理无意拖曳
m_dwDragStart = GetTickCount();
CTreeCtrl::OnLButtonDown(nFlags, point);
}
void CXTree::OnTimer(UINT nIDEvent)
{
// TODO: Add your message handler code here and/or call default
//鼠标敏感节点
if( nIDEvent == m_nHoverTimerID )
{
KillTimer( m_nHoverTimerID );
m_nHoverTimerID = 0;
HTREEITEM trItem = 0;
UINT uFlag = 0;
trItem = HitTest( m_HoverPoint,&uFlag );
if( trItem && m_bDragging )
{
SelectItem( trItem );
Expand( trItem,TVE_EXPAND );
}
}
//处理拖曳过程中的滚动问题
else if( nIDEvent == m_nScrollTimerID )
{
m_TimerTicks++;
CPoint pt;
GetCursorPos( &pt );
CRect rect;
GetClientRect( &rect );
ClientToScreen( &rect );
HTREEITEM hItem = GetFirstVisibleItem();
if( pt.y < rect.top +10 )
{
//向上滚动
int slowscroll = 6 - (rect.top + 10 - pt.y )/20;
if( 0 == (m_TimerTicks % ((slowscroll > 0) ? slowscroll : 1)) )
{
CImageList::DragShowNolock ( false );
SendMessage( WM_VSCROLL,SB_LINEUP );
SelectDropTarget( hItem );
m_hItemDragD = hItem;
CImageList::DragShowNolock ( true );
}
}
else if( pt.y > rect.bottom - 10 )
{
//向下滚动
int slowscroll = 6 - (pt.y - rect.bottom + 10)/20;
if( 0 == (m_TimerTicks % ((slowscroll > 0) ? slowscroll : 1)) )
{
CImageList::DragShowNolock ( false );
SendMessage( WM_VSCROLL,SB_LINEDOWN );
int nCount = GetVisibleCount();
for( int i=0 ; i<nCount-1 ; i++ )
hItem = GetNextVisibleItem( hItem );
if( hItem )
SelectDropTarget( hItem );
m_hItemDragD = hItem;
CImageList::DragShowNolock ( true );
}
}
}
else
CTreeCtrl::OnTimer(nIDEvent);
}