树状控件的应用(选择出阵武将)

原创

闻缺陷则喜何志丹 2022-10-05 10:59:43 ©著作权

文章标签 tree insert null class 控件 文章分类 运维

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树状控件的应用

何志丹

下面是树状控件的一些应用,由于是由于用于演示,所以结构并不合理.其效果如图所示..

步骤如下:

1,Insert -> new class,插入一个新类CMyCtrl,基类为CTreeCtrl.

2,利用类向导为CMyTree添加WM_PANIT的响应函数.

代码如下:

void CMyTree::OnPaint() 
  
{
  
         CPaintDC dc(this); 
  
         CWnd::DefWindowProc( WM_PAINT, (WPARAM)dc.GetSafeHdc(), 0 );
  
         HTREEITEM hItem = this->GetFirstVisibleItem();
  
         while(NULL != hItem)
  
         {
  
                   UINT selflag = TVIS_DROPHILITED | TVIS_SELECTED;
  
                   if(GetItemState( hItem, selflag ) & selflag)
  
                   {
  
                            hItem = GetNextVisibleItem(hItem);
  
                            continue ;
  
                   }
  
                   CRect r;
  
                   GetItemRect(hItem,&r,true);
  
                   {//擦除旧内容                              
  
                            COLORREF col = dc.GetBkColor();
  
                            CBrush brush(col);
  
                            CPen   pen(PS_NULL,1,col);
  
                            CBrush * pOldBrush = dc.SelectObject(&brush);
  
                            CPen   * pOldPen   = dc.SelectObject(&pen);
  
                            dc.Rectangle(&r);
  
                            dc.SelectObject(pOldBrush);
  
                            dc.SelectObject(pOldPen);                  
                   }
  
                   CString strText = GetItemText(hItem);
  
                   //设置颜色
  
                   dc.SetBkColor( GetSysColor( COLOR_WINDOW ) );
  
                   dc.SetTextColor(RGB(255,0,0));
  
                   //更改字体
  
                   LOGFONT logfont ;
  
                   GetFont()->GetLogFont( &logfont );
  
                   logfont.lfItalic = true;
  
                   CFont font;
  
                   font.CreateFontIndirect(&logfont);
  
                   dc.SelectObject(&font);
  
                   dc.TextOut(r.left + 2,r.top + 1,strText);
  
                   
                   hItem = GetNextVisibleItem(hItem);
  
         }
  
}

3,建立一个基于对话框的程序,增加一个树状控件,ctrl + w打开类向导,为它增加一个关联变量m_tree_ctrl.

4,对树状控件右键,选取属性,把has buttons,has lines,lines at root都选上.

5,手动把CTreeCtrl m_tree_ctrl;改成CMyTree m_tree_ctrl;不要忘记了包含头文件,

#include "MyTree.h"

6,修改对话框的OnInitDialog

BOOL CTestTreeDlg::OnInitDialog()
  
{       
         …..
  
         HTREEITEM hRootItem = m_tree_ctrl.InsertItem("五虎上将!");
  
         m_tree_ctrl.InsertItem("关羽",hRootItem);
  
         m_tree_ctrl.InsertItem("张飞",hRootItem);
  
         m_tree_ctrl.InsertItem("赵云",hRootItem);
  
         m_tree_ctrl.InsertItem("马超",hRootItem);
  
         m_tree_ctrl.InsertItem("黄忠",hRootItem);
  
}

7,Ctrl + F5.效果如图.

8,在资源管理器中增加一个位图,ID为IDB_STATE.

9, 在CMyTree中增加成员变量CImageList m_Images;

10,修改CMyTree的PreSubclassWindow的响应函数.

void CMyTree::PreSubclassWindow() 
  
{
  
         SetBkColor(RGB(255,255,255));
  
         
         m_Images.Create (IDB_STATE, 18, 4, RGB (128, 0, 0));
  
         SetImageList (&m_Images, TVSIL_NORMAL);
  
         SetWindowLong(m_hWnd, GWL_STYLE, TVS_SHOWSELALWAYS|GetWindowLong(m_hWnd, GWL_STYLE));
  
         
         CTreeCtrl::PreSubclassWindow();
  
}

11,增CMyTree类=NM_CLICK的响应函数.

void CMyTree::OnClick(NMHDR* pNMHDR, LRESULT* pResult) 
  
{
  
         DWORD dw = GetMessagePos();
  
         CPoint pt(LOWORD(dw),HIWORD(dw));//鼠标的屏幕坐标
  
         //转换为相对树控件的坐标
  
         CPoint pt1 = pt;
  
         CRect rect;
  
         GetClientRect(rect);
  
         ClientToScreen(&rect);
  
         
         pt1.x -= rect.left;
  
         pt1.y -= rect.top;
  
         
         //判断在树控件中的位置
  
         TVHITTESTINFO tHitTestInfo;
  
         tHitTestInfo.pt = pt1;
  
         HitTest(&tHitTestInfo);    
         
         if (TVHT_ONITEMICON == tHitTestInfo.flags)
  
         {
  
                   int nImage,nSelectImage ;
  
                   GetItemImage(tHitTestInfo.hItem,nImage,nSelectImage);
  
                   if(0 == nImage)
  
                            SetItemImage(tHitTestInfo.hItem,3,3);
  
                   else if(3 == nImage)
  
                            SetItemImage(tHitTestInfo.hItem,0,0);
  
         }
  
         
         *pResult = 0;
  
}

12,把对话框标题改为”请选择出阵的武将”.

13,

BOOL CTestTreeDlg::OnInitDialog()
  
{       
         …..
  
         HTREEITEM hItem ;
  
         hItem = m_tree_ctrl.InsertItem("关羽");
  
         m_tree_ctrl.SetItemImage(hItem,1,1);
  
         m_tree_ctrl.InsertItem("张飞");
  
         m_tree_ctrl.InsertItem("赵云");
  
         m_tree_ctrl.InsertItem("马超");
  
         hItem = m_tree_ctrl.InsertItem("黄忠");
  
         m_tree_ctrl.SetItemImage(hItem,2,2);
   
}