功能：编辑框输入数字；当数值＜10，静态文本显示内容绿色字体；当数值≥10 红色字体。
打开资源视图 IDD_COLORTEXTDEMO_DIALOG
Edit Box：ID = IDC_EDIT_NUM
Static Text：ID = IDC_STATIC_SHOW
相关代码如下：
ColorTextDemoDlg.h
cpp
#if !defined(AFX_COLORTEXTDEMODLG_H__10123456_ABCD_EFGH_1234_001122334455__INCLUDED_)
#define AFX_COLORTEXTDEMODLG_H__10123456_ABCD_EFGH_1234_001122334455__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
class CColorTextDemoDlg : public CDialog
{
// Construction
public:
CColorTextDemoDlg(CWnd* pParent = NULL); // standard constructor
// Dialog Data
//{{AFX_DATA(CColorTextDemoDlg)
enum { IDD = IDD_COLORTEXTDEMO_DIALOG };
CStatic m_StaticShow;
CEdit m_EditNum;
//}}AFX_DATA
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CColorTextDemoDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL
// Implementation
protected:
HICON m_hIcon;
COLORREF m_colorText; //保存文本颜色
// Generated message map functions
//{{AFX_MSG(CColorTextDemoDlg)
virtual BOOL OnInitDialog();
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
afx_msg void OnPaint();
afx_msg HCURSOR OnQueryDragIcon();
afx_msg void OnChangeEditNum(); //编辑框内容改变通知
afx_msg HBRUSH OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor);
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};
//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.
#endif // !defined(AFX_COLORTEXTDEMODLG_H__10123456_ABCD_EFGH_1234_001122334455__INCLUDED_)ColorTextDemoDlg.cpp
cpp
#include "stdafx.h"
#include "ColorTextDemo.h"
#include "ColorTextDemoDlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About
class CAboutDlg : public CDialog
{
public:
CAboutDlg();
// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL
// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
//{{AFX_DATA_INIT(CAboutDlg)
//}}AFX_DATA_INIT
}
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CAboutDlg)
//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CColorTextDemoDlg dialog
CColorTextDemoDlg::CColorTextDemoDlg(CWnd* pParent /*=NULL*/)
: CDialog(CColorTextDemoDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CColorTextDemoDlg)
//}}AFX_DATA_INIT
// NOTE: the ClassWizard will add member initialization here
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
m_colorText = RGB(0,0,0); //初始黑色
}
void CColorTextDemoDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CColorTextDemoDlg)
DDX_Control(pDX, IDC_STATIC_SHOW, m_StaticShow);
DDX_Control(pDX, IDC_EDIT_NUM, m_EditNum);
//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CColorTextDemoDlg, CDialog)
//{{AFX_MSG_MAP(CColorTextDemoDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_EN_CHANGE(IDC_EDIT_NUM, OnChangeEditNum)
ON_WM_CTLCOLOR()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
BOOL CColorTextDemoDlg::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
SetIcon(m_hIcon, FALSE); // Set small icon
//初始化静态文本内容
m_StaticShow.SetWindowText(_T("等待输入数值"));
return TRUE; // return TRUE unless you set the focus to a control
}
void CColorTextDemoDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}
// If you add a minimize button to your dialog, you will need the code below
// to draw the icon. For MFC applications using the document/view model,
// this is automatically done for you by the framework.
void CColorTextDemoDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
// Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;
// Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}
// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CColorTextDemoDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}
//编辑框内容发生变化
void CColorTextDemoDlg::OnChangeEditNum()
{
CString strEdit;
m_EditNum.GetWindowText(strEdit);
int nVal;
//判断是否是有效数字
if(_stscanf(strEdit, _T("%d"), &nVal) != 1)
{
m_StaticShow.SetWindowText(_T("输入无效数字"));
m_colorText = RGB(0,0,0); //无效时黑色
m_StaticShow.Invalidate();//刷新控件颜色
return;
}
CString strShow;
strShow.Format(_T("当前数值：%d"), nVal);
m_StaticShow.SetWindowText(strShow);
//核心逻辑：小于10绿色；>=10红色
if(nVal < 10)
{
m_colorText = RGB(0, 180, 0); //绿色
}
else
{
m_colorText = RGB(200, 0, 0); //红色
}
m_StaticShow.Invalidate(); //触发OnCtlColor重绘文字颜色
}
//控件颜色回调，修改静态文本字体颜色
HBRUSH CColorTextDemoDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
if(pWnd->GetDlgCtrlID() == IDC_STATIC_SHOW)
{
pDC->SetTextColor(m_colorText); //设置文字颜色
pDC->SetBkMode(TRANSPARENT); //背景透明
}
return hbr;
}运行程序
