Treectrl de 用法

来源：互联网发布：corethink php版本编辑：程序博客网时间：2024/04/29 10:45

1.树视图风格:

TVS_HASBUTTONS; //在父项旁边显示(+)和(-)

TVS_HASLINES; //使用线条显示各项之间的层次

TVS_LINESATROOT;//使用线条链接树视图控件根部各项

2.处理单击事件:TVN_SELCHANGED

void CTreeCtrlDlg::OnTvnSelchangedTree1(NMHDR *pNMHDR, LRESULT *pResult)

{

LPNMTREEVIEW pNMTreeView = reinterpret_cast<LPNMTREEVIEW>(pNMHDR);

// TODO: 在此添加控件通知处理程序代码

HTREEITEM ht=m_treeCtrl.GetSelectedItem();

CString strSelect=m_treeCtrl.GetItemText(ht);

m_strTreeVal=strSelect;

UpdateData(FALSE);

*pResult = 0;

}

3.同时让自己派生的CMyTreeCtrl类和对话框处理TVN_SELCHANGED消息:

只须在CMyTreeCtrl中处理以下消息,并返回FALSE就OK了ON_NOTIFY_REFLECT_EX(TVN_SELCHANGED, OnTvnSelchanged) OnTvnSelchanged的签名如下

BOOL CMyTreeCtrl::OnTvnSelchanged(NMHDR *pNMHDR,LRESULT *pResult)

4.编辑标签:要允许编辑树视图控件中的文本,可以设置以下三个步骤

1.设置树视图的TVS_EDITLABELS风格

TVS_EDITLABE可以通过资源编辑框内部修改(Edit labels),也可以用代码的方式修改,如下

long lStyle=::GetWindowLong(m_treeCtrl.GetSafeHwnd(),GWL_STYLE);

lStyle|=TVS_EDITLABELS;

::SetWindowLong(m_treeCtrl.GetSafeHwnd(),GWL_STYLE,lStyle)

2.处理TVN_BEGINLABELEDIT通知消息

//设置相关限制,如限制编辑框字符串长度

CEdit*pEdit=GetEditControl(); //获取当前选中结点编辑框

ASSERT(pEdit);

if (pEdit)

{

pEdit->LimitText(15);//设置编辑框文本长度为15个字符串

*pResult = 0;

}

3.处理TVN_ENDLABLEEDIT通知消息

HTREEITEM hParent=GetParentItem(pTVDispInfo->item.hItem); //获取父结点

HTREEITEM hChild=GetChildItem(hParent?hParent:TVI_ROOT); //获取第一个根结点

hChild=GetNextSiblingItem(hChild); //获取下一个兄弟节点

if (pTVDispInfo->item.hItem!=hChild) //判断是否与当前节点相同

pTVDispInfo->item.pszText //获取当前节点的字符串

CString strText=GetItemText(hChild); //获取节点的字符串

3.让树视图处理Esc和Enter键

重载PreTranslateMessage函数

BOOL bHandleMsg=FALSE;

switch(pMsg->message) {

case VK_ESCAPE:

case VK_RETURN:

if (::GetKeyState(VK_CONTROL)&0x8000)

{

break;

}

if (GetEditControl())

{

::TranslateMessage(pMsg);

::DispatchMessage(pMsg);

bHandleMsg=TRUE;

}

break;

}

4.实现上下文菜单

在WM_RBUTTONDOWN消息处理函数上实现上下文菜单

5.展开和收起树视图结点:

HTREEITEM hItem=GetRootItem(); //获取根结点,可能会有多个根结点

ItemHasChildren(hParent) //判断结点是否有孩子结点

hItem=GetChildItem(hParent); //获取第一个子结点

hItem=GetNextSiblingItem(hItem)); //获取下一个兄弟结点结点

Expand(hItem,bExpand?TVE_EXPAND:TVE_COLLAPSE);//展开/叠起结点

Select(hItem,TVGN_FIRSTVISIBLE); //设置选中结点

CString str=GetItemText(hChild); //获取结点字符串信息

HTREEITEM hCurrSel = GetSelectedItem(); //获取当前选中结点

SelectItem(hNewSel);

HTREEITEM hNewSel = HitTest(pt, &nFlags); //判断坐标是否在当前结点范围内

HTREEITEM hItem=InsertItem(dlg.m_strItemText,hItemParent); //插入结点

#pragma once

//定义文件MyTreeCtrl.h

// CMyTreeCtrl

class CMyTreeCtrl : public CTreeCtrl

{

DECLARE_DYNAMIC(CMyTreeCtrl)

public:

CMyTreeCtrl();

virtual ~CMyTreeCtrl();

protected:

DECLARE_MESSAGE_MAP()

void ExpandBranch(HTREEITEM hItem,BOOL bExpand =TRUE);

public:

void ExpandAllBranches(BOOL bExpand =TRUE);

BOOL DoesItemExist(HTREEITEM hItemParent, CString const& strItem);

afx_msg void OnRButtonDown(UINT nFlags, CPoint point);

afx_msg void OnAddItem();

virtual BOOL PreTranslateMessage(MSG* pMsg);

afx_msg void OnTvnBeginlabeledit(NMHDR *pNMHDR, LRESULT *pResult);

afx_msg void OnTvnEndlabeledit(NMHDR *pNMHDR, LRESULT *pResult);

afx_msg BOOL OnTvnSelchanged(NMHDR *pNMHDR, LRESULT *pResult);

};

// MyTreeCtrl.cpp : 实现文件

#include "stdafx.h"

#include "TreeCtrl.h"

#include "MyTreeCtrl.h"

#include "./mytreectrl.h"

#include "AddItemDlg.h"

// CMyTreeCtrl

IMPLEMENT_DYNAMIC(CMyTreeCtrl, CTreeCtrl)

CMyTreeCtrl::CMyTreeCtrl()

{

}

CMyTreeCtrl::~CMyTreeCtrl()

{

}

BEGIN_MESSAGE_MAP(CMyTreeCtrl, CTreeCtrl)

ON_WM_RBUTTONDOWN()

ON_COMMAND(IDR_ADD_ITEM, OnAddItem)

ON_NOTIFY_REFLECT(TVN_ENDLABELEDIT, OnTvnEndlabeledit)

ON_NOTIFY_REFLECT(TVN_BEGINLABELEDIT, OnTvnBeginlabeledit)

ON_NOTIFY_REFLECT_EX(TVN_SELCHANGED, OnTvnSelchanged)

END_MESSAGE_MAP()

// CMyTreeCtrl 消息处理程序

void CMyTreeCtrl::ExpandBranch(HTREEITEM hItem,BOOL bExpand /* =TRUE */)

//展开

{

if (ItemHasChildren(hItem)) //判断是否有孩子结点

{

Expand(hItem,bExpand?TVE_EXPAND:TVE_COLLAPSE);

//展开/叠起结点

hItem=GetChildItem(hItem);//获取第一个子结点

do {

ExpandBranch(hItem);

} while(hItem=GetNextSiblingItem(hItem));//获取兄弟结点

}

void CMyTreeCtrl::ExpandAllBranches(BOOL bExpand /* =TRUE */)

{

HTREEITEM hItem=GetRootItem();//获取根结点,可能会有多个根结点

do {

ExpandBranch(hItem,bExpand);

} while(hItem=GetNextSiblingItem(hItem));

Select(hItem,TVGN_FIRSTVISIBLE);//设置选中结点

}

BOOL CMyTreeCtrl::DoesItemExist(HTREEITEM hItemParent,

CString const& strItem)

{

BOOL bDoesItemExist=FALSE;

ASSERT(strItem.GetLength());

HTREEITEM hChild=GetChildItem(hItemParent?hItemParent:TVI_ROOT);

while (NULL!=hChild&&!bDoesItemExist)

{

CString str=GetItemText(hChild);//获取结点字符串信息

if (0==str.CompareNoCase(strItem))

{

bDoesItemExist=TRUE;

}

else

{

hChild=GetNextSiblingItem(hChild);

}

return bDoesItemExist;

}

void CMyTreeCtrl::OnRButtonDown(UINT nFlags, CPoint point)

{

// TODO: 在此添加消息处理程序代码和/或调用默认值

// set focus to the tree control

SetFocus();

// map the point that is passed to the

// function from client coordinates

// to screen coordinates

ClientToScreen(&point);

// Get the currently selected item

HTREEITEM hCurrSel = GetSelectedItem();//获取当前选中结点

// Figure out which item was right clicked

CPoint pt(0, 0);

::GetCursorPos(&pt);

ScreenToClient (&pt);

HTREEITEM hNewSel = HitTest(pt, &nFlags);

// Set the selection to the item that the

// mouse was over when the user right

// clicked

if (NULL == hNewSel)

{

SelectItem(NULL);

}

else if (hCurrSel != hNewSel)

{

SelectItem(hNewSel);

SetFocus();

}

// Load the context menu

CMenu Menu;

if (Menu.LoadMenu(IDM_CONTEXT_MENU))

{

CMenu* pSubMenu = Menu.GetSubMenu(0);

if (pSubMenu!=NULL)

{

// Display the context menu

pSubMenu->TrackPopupMenu(

TPM_LEFTALIGN | TPM_RIGHTBUTTON,

point.x, point.y, this);

}

void CMyTreeCtrl::OnAddItem()

//添加上下文菜单

{

// TODO: 在此添加命令处理程序代码

HTREEITEM hItemParent=GetSelectedItem();

//获取当前选中结点

CAddItemDlg dlg;

if (dlg.DoModal()==IDOK)

{

if (!DoesItemExist(hItemParent,dlg.m_strItemText))

{

HTREEITEM hItem=InsertItem(dlg.m_strItemText,hItemParent);

//插入结点

SelectItem(hItem);

}

else

{

AfxMessageBox("已存在相同结点");

}

BOOL CMyTreeCtrl::PreTranslateMessage(MSG* pMsg)

{

// TODO: 在此添加专用代码和/或调用基类

BOOL bHandledMsg = FALSE;

switch (pMsg->message)

{

case WM_KEYDOWN:

{

switch (pMsg->wParam)

{

case VK_ESCAPE:

case VK_RETURN:

if (::GetKeyState(VK_CONTROL) & 0x8000)

{

break;

}

if (GetEditControl())

{

::TranslateMessage(pMsg);

::DispatchMessage(pMsg);

bHandledMsg = TRUE;

}

break;

default: break;

} // switch (pMsg->wParam)

} // WM_KEYDOWN

break;

default: break;

} // switch (pMsg->message)

// continue normal translation and dispatching

return (bHandledMsg ?TRUE : CTreeCtrl::PreTranslateMessage(pMsg));

}

void CMyTreeCtrl::OnTvnBeginlabeledit(NMHDR *pNMHDR, LRESULT *pResult)

{

LPNMTVDISPINFO pTVDispInfo = reinterpret_cast<LPNMTVDISPINFO>(pNMHDR);

// TODO: 在此添加控件通知处理程序代码

*pResult=1;

CEdit*pEdit=GetEditControl();

ASSERT(pEdit);

if (pEdit)

{

pEdit->LimitText(15);

*pResult=0;

}

void CMyTreeCtrl::OnTvnEndlabeledit(NMHDR *pNMHDR, LRESULT *pResult)

{

LPNMTVDISPINFO pTVDispInfo = reinterpret_cast<LPNMTVDISPINFO>(pNMHDR);

// TODO: 在此添加控件通知处理程序代码

BOOL bValidItem=FALSE;

CString strItem=pTVDispInfo->item.pszText;

if (0<strItem.GetLength())

{

HTREEITEM hParent=GetParentItem(pTVDispInfo->item.hItem);

bValidItem=!DoesItemExist(hParent,strItem);

}

*pResult = bValidItem;

}

BOOL CMyTreeCtrl::OnTvnSelchanged(NMHDR *pNMHDR, LRESULT *pResult)

{

LPNMTREEVIEW pNMTreeView = reinterpret_cast<LPNMTREEVIEW>(pNMHDR);

// TODO: 在此添加控件通知处理程序代码

TRACE(GetItemText(pNMTreeView->itemNew.hItem));

TRACE("/n");

*pResult = 0;

return FALSE; //返回FALSE可以让父窗口进行进一步的处理

}