Visual C++ MFC Dialod Based Application - Assigning Hot keys to Dialog Controls at Run Time
If you click on a button from a MFC dialog box, it will invoke the Click Event Handler. How do I make it work with the function keys Ctrl + F2, for invoking the handler. Can we change the hot keys at runtime? Yes, Everything possible. Look at the source code and screen shots.
The key functions to use are, UnregisterHotKey, RegisterHotKey, PreTranslateMessage and WM_HOTKEY message. PostMessage(BM_CLICK). BM_CLICK is for button click event message.
Source Code
// CShortCutKeyDlg.cpp : implementation file
//
#include "stdafx.h"
#include "CShortCutKey.h"
#include "CShortCutKeyDlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
// CAboutDlg dialog used for App About
class CAboutDlg : public CDialog
{
public:
CAboutDlg();
// Dialog Data
enum { IDD = IDD_ABOUTBOX };
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
// Implementation
protected:
DECLARE_MESSAGE_MAP()
};
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
}
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
}
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
END_MESSAGE_MAP()
// CCShortCutKeyDlg dialog
CCShortCutKeyDlg::CCShortCutKeyDlg(CWnd* pParent /*=NULL*/)
: CDialog(CCShortCutKeyDlg::IDD, pParent)
, m_sel1(0)
, m_sel2(0)
{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
void CCShortCutKeyDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
DDX_Control(pDX, IDC_COMBO1, m_ctrl1);
DDX_Control(pDX, IDC_COMBO2, m_ctrl2);
DDX_CBIndex(pDX, IDC_COMBO1, m_sel1);
DDX_CBIndex(pDX, IDC_COMBO2, m_sel2);
}
BEGIN_MESSAGE_MAP(CCShortCutKeyDlg, CDialog)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
//}}AFX_MSG_MAP
ON_BN_CLICKED(IDOK, &CCShortCutKeyDlg::OnBnClickedOk)
ON_CBN_SELCHANGE(IDC_COMBO1, &CCShortCutKeyDlg::OnCbnSelchangeCombo1)
ON_CBN_SELCHANGE(IDC_COMBO2, &CCShortCutKeyDlg::OnCbnSelchangeCombo2)
ON_BN_CLICKED(IDC_BUTTON1, &CCShortCutKeyDlg::OnBnClickedButton1)
ON_BN_CLICKED(IDC_BUTTON2, &CCShortCutKeyDlg::OnBnClickedButton2)
END_MESSAGE_MAP()
// CCShortCutKeyDlg message handlers
BOOL CCShortCutKeyDlg::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
m_ctrl1.AddString(L"No Shortcut");
m_ctrl2.AddString(L"No Shortcut");
for(int i = 0; i < 10; i++)
{
wchar_t buf[12];
wsprintf(buf, L"F%d", i + 1);
m_ctrl1.AddString(buf);
m_ctrl2.AddString(buf);
}
m_sel1 = m_sel2 = 0;
UpdateData(FALSE);
return TRUE; // return TRUE unless you set the focus to a control
}
void CCShortCutKeyDlg::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 CCShortCutKeyDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting
SendMessage(WM_ICONERASEBKGND, reinterpret_cast<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 function to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CCShortCutKeyDlg::OnQueryDragIcon()
{
return static_cast<HCURSOR>(m_hIcon);
}
void CCShortCutKeyDlg::OnBnClickedOk()
{
// TODO: Add your control notification handler code here
OnOK();
}
void CCShortCutKeyDlg::OnCbnSelchangeCombo1()
{
UnregisterHotKey( NULL, IDC_BUTTON1);
UpdateData(TRUE);
if(RegisterHotKey( NULL, IDC_BUTTON1, 0, 0x70 + (m_sel1 - 1)) == FALSE)
{
MessageBox(L"Hot Key is alreday registered");
m_sel1 = 0;
}
UpdateData(FALSE);
}
void CCShortCutKeyDlg::OnCbnSelchangeCombo2()
{
UnregisterHotKey( NULL, IDC_BUTTON2);
UpdateData(TRUE);
if(RegisterHotKey( NULL, IDC_BUTTON2, 0, 0x70 + (m_sel2 - 1)) == FALSE)
{
MessageBox(L"Hot Key is alreday registered");
m_sel2 = 0;
}
UpdateData(FALSE);
}
BOOL CCShortCutKeyDlg::PreTranslateMessage(MSG* pMsg)
{
if(pMsg->message == WM_HOTKEY)
{
GetDlgItem(pMsg->wParam)->PostMessage(BM_CLICK);
}
return CDialog::PreTranslateMessage(pMsg);
}
void CCShortCutKeyDlg::OnBnClickedButton1()
{
MessageBox(L"Button1 Pressed");
}
void CCShortCutKeyDlg::OnBnClickedButton2()
{
MessageBox(L"Button2 Pressed");
}
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Output
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