MFC Windows 程序设计键盘捕获

#include <afxwin.h> #include "VisualKB.h" CMyApp myApp; ///////////////////////////////////////////////////////////////////////// // CMyApp member functions BOOL CMyApp::InitInstance () { m_pMainWnd = new CMainWindow; m_pMainWnd->ShowWindow (m_nCmdShow); m_pMainWnd->UpdateWindow (); return TRUE; } ///////////////////////////////////////////////////////////////////////// // CMainWindow message map and member functions BEGIN_MESSAGE_MAP (CMainWindow, CWnd) ON_WM_CREATE () ON_WM_PAINT () ON_WM_SETFOCUS () ON_WM_KILLFOCUS () ON_WM_SETCURSOR () ON_WM_LBUTTONDOWN () ON_WM_KEYDOWN () ON_WM_KEYUP () ON_WM_SYSKEYDOWN () ON_WM_SYSKEYUP () ON_WM_CHAR () ON_WM_SYSCHAR () END_MESSAGE_MAP () CMainWindow::CMainWindow () { m_nTextPos = 0; m_nMsgPos = 0; // // Load the arrow cursor and the I-beam cursor and save their handles. // m_hCursorArrow = AfxGetApp ()->LoadStandardCursor (IDC_ARROW); m_hCursorIBeam = AfxGetApp ()->LoadStandardCursor (IDC_IBEAM); // // Register a WNDCLASS. // CString strWndClass = AfxRegisterWndClass ( 0, NULL, (HBRUSH) (COLOR_3DFACE + 1), AfxGetApp ()->LoadStandardIcon (IDI_WINLOGO) ); // // Create a window. // CreateEx (0, strWndClass, _T ("Visual Keyboard"), WS_OVERLAPPED | WS_SYSMENU | WS_CAPTION | WS_MINIMIZEBOX, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL); } int CMainWindow::OnCreate (LPCREATESTRUCT lpCreateStruct) { if (CWnd::OnCreate (lpCreateStruct) == -1) return -1; // // Initialize member variables whose values are dependent upon screen // metrics. // CClientDC dc (this); TEXTMETRIC tm; dc.GetTextMetrics (&tm); m_cxChar = tm.tmAveCharWidth; m_cyChar = tm.tmHeight; m_cyLine = tm.tmHeight + tm.tmExternalLeading; m_rcTextBoxBorder.SetRect (16, 16, (m_cxChar * 64) + 16, ((m_cyChar * 3) / 2) + 16); m_rcTextBox = m_rcTextBoxBorder; m_rcTextBox.InflateRect (-2, -2); m_rcMsgBoxBorder.SetRect (16, (m_cyChar * 4) + 16, (m_cxChar * 64) + 16, (m_cyLine * MAX_STRINGS) + (m_cyChar * 6) + 16); m_rcScroll.SetRect (m_cxChar + 16, (m_cyChar * 6) + 16, (m_cxChar * 63) + 16, (m_cyLine * MAX_STRINGS) + (m_cyChar * 5) + 16); m_ptTextOrigin.x = m_cxChar + 16; m_ptTextOrigin.y = (m_cyChar / 4) + 16; m_ptCaretPos = m_ptTextOrigin; m_nTextLimit = (m_cxChar * 63) + 16; m_ptHeaderOrigin.x = m_cxChar + 16; m_ptHeaderOrigin.y = (m_cyChar * 3) + 16; m_ptUpperMsgOrigin.x = m_cxChar + 16; m_ptUpperMsgOrigin.y = (m_cyChar * 5) + 16; m_ptLowerMsgOrigin.x = m_cxChar + 16; m_ptLowerMsgOrigin.y = (m_cyChar * 5) + (m_cyLine * (MAX_STRINGS - 1)) + 16; m_nTabStops[0] = (m_cxChar * 24) + 16; m_nTabStops[1] = (m_cxChar * 30) + 16; m_nTabStops[2] = (m_cxChar * 36) + 16; m_nTabStops[3] = (m_cxChar * 42) + 16; m_nTabStops[4] = (m_cxChar * 46) + 16; m_nTabStops[5] = (m_cxChar * 50) + 16; m_nTabStops[6] = (m_cxChar * 54) + 16; // // Size the window. // CRect rect (0, 0, m_rcMsgBoxBorder.right + 16, m_rcMsgBoxBorder.bottom + 16); CalcWindowRect (&rect); SetWindowPos (NULL, 0, 0, rect.Width (), rect.Height (), SWP_NOZORDER | SWP_NOMOVE | SWP_NOREDRAW); return 0; } void CMainWindow::PostNcDestroy () { delete this; } void CMainWindow::OnPaint () { CPaintDC dc (this); // // Draw the rectangles surrounding the text box and the message list. // dc.DrawEdge (m_rcTextBoxBorder, EDGE_SUNKEN, BF_RECT); dc.DrawEdge (m_rcMsgBoxBorder, EDGE_SUNKEN, BF_RECT); // // Draw all the text that appears in the window. // DrawInputText (&dc); DrawMessageHeader (&dc); DrawMessages (&dc); } void CMainWindow::OnSetFocus (CWnd* pWnd) { // // Show the caret when the VisualKB window receives the input focus. // CreateSolidCaret (max (2, ::GetSystemMetrics (SM_CXBORDER)), m_cyChar); SetCaretPos (m_ptCaretPos); ShowCaret (); } void CMainWindow::OnKillFocus (CWnd* pWnd) { // // Hide the caret when the VisualKB window loses the input focus. // HideCaret (); m_ptCaretPos = GetCaretPos (); ::DestroyCaret (); } BOOL CMainWindow::OnSetCursor (CWnd* pWnd, UINT nHitTest, UINT message) { // // Change the cursor to an I-beam if it's currently over the text box, // or to an arrow if it's positioned anywhere else. // if (nHitTest == HTCLIENT) { DWORD dwPos = ::GetMessagePos (); CPoint point (LOWORD (dwPos), HIWORD (dwPos)); ScreenToClient (&point); ::SetCursor (m_rcTextBox.PtInRect (point) ? m_hCursorIBeam : m_hCursorArrow); return TRUE; } return CWnd::OnSetCursor (pWnd, nHitTest, message); } void CMainWindow::OnLButtonDown (UINT nFlags, CPoint point) { // // Move the caret if the text box is clicked with the left mouse button. // if (m_rcTextBox.PtInRect (point)) { m_nTextPos = GetNearestPos (point); PositionCaret (); } } void CMainWindow::OnKeyDown (UINT nChar, UINT nRepCnt, UINT nFlags) { ShowMessage (_T ("WM_KEYDOWN"), nChar, nRepCnt, nFlags); // // Move the caret when the left, right, Home, or End key is pressed. // switch (nChar) { case VK_LEFT: if (m_nTextPos != 0) { m_nTextPos--; PositionCaret (); } break; case VK_RIGHT: if (m_nTextPos != m_strInputText.GetLength ()) { m_nTextPos++; PositionCaret (); } break; case VK_HOME: m_nTextPos = 0; PositionCaret (); break; case VK_END: m_nTextPos = m_strInputText.GetLength (); PositionCaret (); break; } } void CMainWindow::OnChar (UINT nChar, UINT nRepCnt, UINT nFlags) { ShowMessage (_T ("WM_CHAR"), nChar, nRepCnt, nFlags); CClientDC dc (this); // // Determine which character was just input from the keyboard. // switch (nChar) { case VK_ESCAPE: case VK_RETURN: m_strInputText.Empty (); m_nTextPos = 0; break; case VK_BACK: if (m_nTextPos != 0) { m_strInputText = m_strInputText.Left (m_nTextPos - 1) + m_strInputText.Right (m_strInputText.GetLength () - m_nTextPos); m_nTextPos--; } break; default: if ((nChar >= 0) && (nChar <= 31)) return; if (m_nTextPos == m_strInputText.GetLength ()) { m_strInputText += nChar; m_nTextPos++; } else m_strInputText.SetAt (m_nTextPos++, nChar); CSize size = dc.GetTextExtent (m_strInputText, m_strInputText.GetLength ()); if ((m_ptTextOrigin.x + size.cx) > m_nTextLimit) { m_strInputText = nChar; m_nTextPos = 1; } break; } // // Update the contents of the text box. // HideCaret (); DrawInputText (&dc); PositionCaret (&dc); ShowCaret (); } void CMainWindow::OnKeyUp (UINT nChar, UINT nRepCnt, UINT nFlags) { ShowMessage (_T ("WM_KEYUP"), nChar, nRepCnt, nFlags); CWnd::OnKeyUp (nChar, nRepCnt, nFlags); } void CMainWindow::OnSysKeyDown (UINT nChar, UINT nRepCnt, UINT nFlags) { ShowMessage (_T ("WM_SYSKEYDOWN"), nChar, nRepCnt, nFlags); CWnd::OnSysKeyDown (nChar, nRepCnt, nFlags); } void CMainWindow::OnSysChar (UINT nChar, UINT nRepCnt, UINT nFlags) { ShowMessage (_T ("WM_SYSCHAR"), nChar, nRepCnt, nFlags); CWnd::OnSysChar (nChar, nRepCnt, nFlags);