树状控件的应用
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);
}
14,把树状控件的has line取消掉.
15,再为对话框换一个好看的图标.
16,结果如最前面.
