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VC中实现带有背景位图的树型控件(2) |
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作者：未知 来源：未知 加入时间：2006-1-23 人气：155 |
三、实现代码
/////////////////////////////////////////////////
#if !defined(AFX_TREEDLG_H__D82DB384_F574_44A7_96DA_6EC9068E22B1__INCLUDED_)
#define AFX_TREEDLG_H__D82DB384_F574_44A7_96DA_6EC9068E22B1__INCLUDED_
#if _MSC_VER >
1000
#pragma once
#endif // _MSC_VER >
1000
/////////////////////////////////////////// CTreeDlg dialog
#include "MyTreeCtrl.h"
class CTreeDlg : public CDialog
{
// Construction
public:
CTreeDlg(CWnd* pParent = NULL); // standard constructor
// Dialog Data
//{{AFX_DATA(CTreeDlg)
enum { IDD = IDD_TREE_DIALOG };
CMyTreeCtrl m_CtrlTree;
//}}AFX_DATA
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CTreeDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL
// Implementation
protected:
HICON m_hIcon;
// Generated message map functions
//{{AFX_MSG(CTreeDlg)
virtual BOOL OnInitDialog();
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
afx_msg void OnPaint();
afx_msg HCURSOR OnQueryDragIcon();
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};
#endif
////////////////////////////////// MyTreeCtrl.cpp : implementation file
#include "StdAfx.h"
#include "Tree.h"
#include "MyTreeCtrl.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
////////////////////////////// CMyTreeCtrl
CMyTreeCtrl::CMyTreeCtrl()
{}
CMyTreeCtrl::~CMyTreeCtrl()
{}
BEGIN_MESSAGE_MAP(CMyTreeCtrl, CTreeCtrl)
//{{AFX_MSG_MAP(CMyTreeCtrl)
ON_WM_PAINT()
ON_WM_ERASEBKGND()
ON_NOTIFY_REFLECT(TVN_ITEMEXPANDED, OnItemexpanded)
ON_NOTIFY_REFLECT(TVN_ITEMEXPANDING, OnItemexpanding)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CMyTreeCtrl message handlers
BOOL CMyTreeCtrl::SetBKImage(LPCTSTR LpszResource)
{
// if this is not the first call then delete gdi objects
if( m_bitmap.m_hObject != NULL )
m_bitmap.DeleteObject();
HBITMAP hbmp = (HBITMAP)::LoadImage(AfxGetInstanceHandle(),
LpszResource, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION|LR_LOADFROMFILE);
if( hbmp == NULL )
return FALSE;
m_bitmap.Attach( hbmp );
return TRUE;
}
LRESULT CMyTreeCtrl::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
// TODO: Add your specialized code here and/or call the base class
return CTreeCtrl::WindowProc(message, wParam, lParam);
}
void CMyTreeCtrl::OnPaint()
{
CPaintDC dc(this); // device context for painting
CRect rcclient;
GetClientRect(&rcclient);
// create a compatible memory dc
CDC memdc;
memdc.CreateCompatibleDC(&dc);
CBitmap bitmap;
bitmap.CreateCompatibleBitmap(&dc, rcclient.Width(), rcclient.Height());
memdc.SelectObject( &bitmap );
CWnd::DefWindowProc(WM_PAINT, (WPARAM)memdc.m_hDC , 0);
CDC maskdc;
maskdc.CreateCompatibleDC(&dc);
CBitmap maskbitmap;
maskbitmap.CreateBitmap(rcclient.Width(), rcclient.Height(), 1, 1, NULL);
maskdc.SelectObject( &maskbitmap );
maskdc.BitBlt( 0, 0, rcclient.Width(), rcclient.Height(), &memdc,
rcclient.left, rcclient.top, SRCCOPY);
CBrush brush;
brush.CreatePatternBrush(&m_bitmap);
dc.FillRect(rcclient, &brush);
memdc.SetBkColor(RGB(0,0,0));
memdc.SetTextColor(RGB(255,255,255));
memdc.BitBlt(rcclient.left, rcclient.top, rcclient.Width(), rcclient.Height(), &maskdc, rcclient.left, rcclient.top, SRCAND);
dc.SetBkColor(RGB(255,255,255));
dc.SetTextColor(RGB(0,0,0));
dc.BitBlt(rcclient.left, rcclient.top, rcclient.Width(), rcclient.Height(), &maskdc, rcclient.left, rcclient.top, SRCAND);
dc.BitBlt(rcclient.left, rcclient.top, rcclient.Width(), rcclient.Height(), &memdc, rcclient.left, rcclient.top,SRCPAINT);
brush.DeleteObject();
}
BOOL CMyTreeCtrl::OnEraseBkgnd(CDC* pDC)
{
// TODO: Add your message handler code here and/or call default
return TRUE;
}
void CMyTreeCtrl::OnItemexpanded(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
// TODO: Add your control notification handler code here
Invalidate();
SetRedraw(TRUE);
*pResult = 0;
}
void CMyTreeCtrl::OnItemexpanding(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
// TODO: Add your control notification handler code here
SetRedraw(FALSE);
*pResult = 0;
}
///////////////////////////////////////////////////////
BOOL CTreeDlg::OnInitDialog()
{
CDialog::OnInitDialog();
// Add "About..." menu item to system menu.
// IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX
< 0xF000);
CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->
AppendMenu(MF_SEPARATOR);
pSysMenu->
AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}
// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
// TODO: Add extra initialization here
m_CtrlTree.SetBKImage("IDB_BITMAP1");
SetIcon(m_hIcon, FALSE); // Set small icon
TVINSERTSTRUCT tvInsert;
tvInsert.hParent = NULL;
tvInsert.hInsertAfter = NULL;
tvInsert.item.mask = TVIF_TEXT;
tvInsert.item.pszText = _T("Visual C++编程实例");
HTREEITEM hCountry = m_CtrlTree.InsertItem(&tvInsert);
HTREEITEM hPA = m_CtrlTree.InsertItem(TVIF_TEXT,
_T("文章中心"), 0, 0, 0, 0, 0, hCountry, NULL);
HTREEITEM hWA = m_CtrlTree.InsertItem(_T("代码中心"),0, 0, hCountry, hPA);
m_CtrlTree.InsertItem(_T("全屏幕程序的实现"), hPA, TVI_SORT);
m_CtrlTree.InsertItem(_T("实现窗口的任意分割"), hPA, TVI_SORT);
m_CtrlTree.InsertItem(_T("实现菜单的自绘"), hPA, TVI_SORT);
m_CtrlTree.InsertItem(_T("实现全屏幕显示的代码"), hWA, TVI_SORT);
m_CtrlTree.InsertItem(_T("窗口任意分割的代码"), hWA, TVI_SORT);
m_CtrlTree.InsertItem(_T("菜单自绘代码"), hWA, TVI_SORT);
m_CtrlTree.Expand(hCountry,TVE_EXPAND);
return TRUE; // return TRUE unless you set the focus to a control
}
四、小结
到此为止，本例通过实现树形控件的背景位图介绍了一些树视图控件编程方法，包括树视图控件的建立、节点值的赋予等。当然，它应用的方面很广，使用方法也很多。这里仅仅是涉及到了构建树视图控件的基本框架，读者朋友们可以在此基础上，可进行扩展，从而完成更强大的功能，感兴趣的读者不妨自己扩展该控件试试。
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