Win32 键盘事件 - 击键消息、字符消息、插入符号(光标)
2012-11-11 01:50
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注:以下内容为学习笔记,多数是从书本、资料中得来,只为加深印象,及日后参考。然而本人表达能力较差,写的不好。因非翻译、非转载,只好选原创,但多数乃摘抄,实为惭愧。但若能帮助一二访客,幸甚!
以下内容主要来自《Windows 程序设计》
接收到这个键盘事件的窗口称为有输入焦点的窗口。
有时没有窗口具有输入焦点。这种情况发生在所以程序都最小化时。
窗口过程通过捕获WM_SETFOCUS和WM_KILLFOCUS消息来确定自己的窗口是否具有输入焦点。
虚拟键代码存储在WM_KEYDOWN等消息的wParam参数中,确定哪个键被按下或被释放。
当处理击键消息时,可能需要知道是否有转义键(Shift、Ctrl和Alt)或切换键(Caps Lock、Num Lock和Scroll Lock)键被按下。
可以用如下方式:
iState = GetKeyState(VK_SHIFT);
给前面的SYSMETS代码(/article/2385077.html 7.滚动条)中添加键盘处理功能:
简单方法:为窗口过程增加WM_KEYDOWN逻辑
更好的方法:把每一个WM_KEYDOWN消息转换为等同的WM_VSCROLL或WM_HSCROLL消息。可以使用:
SendMessage(hwnd, message, wParam, lParam);
当你调用SendMessage函数时,Windows调用窗口句柄hwnd的窗口过程,同时把四个函数变量传递给他。当窗口过程处理完此消息,Windows把控制权还给紧跟着SendMessage调用的下一条语句。
![](http://img.my.csdn.net/uploads/201211/11/1352621639_9799.PNG)
有键盘了,就差鼠标了~很快会有的。
GetMessage从消息队列中取出下一条消息;
TranslateMessage负责把击键消息转换为字符消息;
DispatchMessage调用此消息的窗口过程。
1)WM_KEYDOWN:’A‘ 的虚拟键代码(0x41)
2)WM_CHAR: 'a'的字符编码(0x61)
3)WM_KEYUP: 'A' 的虚拟键代码(0x41)
按下Shift+A,释放A,再释放Shift:
1)WM_KEYDOWN:虚拟键代码VK_SHIFT(0x10)
2)WM_KEYDOWN:’A‘ 的虚拟键代码(0x41)
3)WM_CHAR: 'A' 的字符编码(0x41)
4)WM_KEYUP: 'A' 的虚拟键代码(0x41)
5)WM_UP:虚拟键代码VK_SHIFT(0x10)
连续按住A:
1)WM_KEYDOWN:’A‘ 的虚拟键代码(0x41)
2)WM_CHAR: 'a'的字符编码(0x61)
3)WM_KEYDOWN:’A‘ 的虚拟键代码(0x41)
4)WM_CHAR: 'a'的字符编码(0x61)
……
n)WM_KEYUP: 'A' 的虚拟键代码(0x41)
![](http://img.my.csdn.net/uploads/201211/11/1352625702_1884.PNG)
相关函数:
CreateCaret:创建和窗口关联的插入符号
SetCaretPos:设置窗口内的插入符号的位置
ShowCaret:显式插入符号
HideCaret:隐藏插入符号
DestroyCaret:销毁插入符号
GetCaretPos:获取插入符号位置
GetCaretBlinkTime、SetCaretBlinkTime:获取、设置插入符号闪烁时间
使用插入符号主要规则:在窗口过程处理WM_SETFOCUS消息时调用CreateCaret,处理WM_KILLFOCUS消息时调用DestroyCaret函数。
创建的插入符号是隐藏的,必须调用ShowCaret使之可见。
要在窗口内绘制某些东西时,它必须调用HideCaret隐藏插入符号。结束绘制后,再调用ShowCaret显式插入符号。
HideCaret效果是叠加的。
一个简单的文本编辑器雏形:
以下内容主要来自《Windows 程序设计》
1.焦点
程序用于从消息队列中读取消息的MSG结构中包含一个hwnd字段。此字段指出了接收消息的窗口句柄。消息循环中的DispatchMessage函数传送消息给需要该消息的窗口过程。接收到这个键盘事件的窗口称为有输入焦点的窗口。
有时没有窗口具有输入焦点。这种情况发生在所以程序都最小化时。
窗口过程通过捕获WM_SETFOCUS和WM_KILLFOCUS消息来确定自己的窗口是否具有输入焦点。
2.队列和同步
当用户按下和释放键盘上的一个键时,Windows和键盘设备驱动程序将硬件扫描码转换为格式化后的消息。但是这些消息并不立即被放入应用程序消息队列,而是由Windows把这些消息存储在系统消息队列中。系统消息队列是一个单独的消息队列,它被Windows用来初步存储用户从键盘和鼠标输入的消息。仅当Windows应用程序完成了对当前一个用户输入消息的处理后,Windows才从系统消息队列中取出下一条消息,并把它放入应用程序消息队列。3.击键消息
当用户按下一个键时,Windows将WM_KEYDOWN或WM_SYSKEYDOWN消息放入具有输入焦点的消息队列中。当该键被释放时,Windows把WM_KEYUP或WM_SYSKEYUP消息放入相应的消息队列中。其中SYS代表系统,它表明该击键对Windows比对应用程序更加重要。虚拟键代码存储在WM_KEYDOWN等消息的wParam参数中,确定哪个键被按下或被释放。
当处理击键消息时,可能需要知道是否有转义键(Shift、Ctrl和Alt)或切换键(Caps Lock、Num Lock和Scroll Lock)键被按下。
可以用如下方式:
iState = GetKeyState(VK_SHIFT);
给前面的SYSMETS代码(/article/2385077.html 7.滚动条)中添加键盘处理功能:
简单方法:为窗口过程增加WM_KEYDOWN逻辑
更好的方法:把每一个WM_KEYDOWN消息转换为等同的WM_VSCROLL或WM_HSCROLL消息。可以使用:
SendMessage(hwnd, message, wParam, lParam);
当你调用SendMessage函数时,Windows调用窗口句柄hwnd的窗口过程,同时把四个函数变量传递给他。当窗口过程处理完此消息,Windows把控制权还给紧跟着SendMessage调用的下一条语句。
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { // cxChar平均字符宽度,cyChar字符的总高度(包括外部间距),cxCaps大写字符的平均宽度 // 等宽字体中,cxCaps等于cxChar,变宽字体中,cxCaps等于cxChar的1.5倍 static int cxChar, cxCaps, cyChar, cxClient, cyClient, iMaxWidth, iVscrollPos; HDC hdc; int i, x, y, iVertPos, iHorzPos, iPaintBeg, iPaintEnd; PAINTSTRUCT ps; SCROLLINFO si; TCHAR szBuffer[10]; TEXTMETRIC tm; switch (message) { case WM_CREATE: hdc = GetDC(hwnd); GetTextMetrics(hdc, &tm); // 获取系统默认字体的尺寸 cxChar = tm.tmAveCharWidth; // tmPitchAndFamily为1表示变宽字体,为0表示等宽字体 cxCaps = (tm.tmPitchAndFamily & 1 ? 3 : 2) * cxChar / 2; cyChar = tm.tmHeight + tm.tmExternalLeading; ReleaseDC(hwnd, hdc); iMaxWidth = 40*cxChar + 22*cxCaps; return 0; case WM_SIZE: cxClient = LOWORD(lParam); cyClient = HIWORD(lParam); si.cbSize = sizeof(si); si.fMask = SIF_RANGE | SIF_PAGE; si.nMin = 0; si.nMax = NUMLINES-1; si.nPage = cyClient / cyChar; SetScrollInfo(hwnd, SB_VERT, &si, TRUE); si.cbSize = sizeof(si); si.fMask = SIF_RANGE | SIF_PAGE; si.nMin = 0; si.nMax = 2 + iMaxWidth/cxChar; si.nPage = cxClient / cxChar; SetScrollInfo(hwnd, SB_HORZ, &si, TRUE); return 0; case WM_VSCROLL: si.cbSize = sizeof(si); si.fMask = SIF_ALL; GetScrollInfo(hwnd, SB_VERT, &si); iVertPos = si.nPos; switch (LOWORD(wParam)) { case SB_TOP: si.nPos = si.nMin; break; case SB_BOTTOM: si.nPos = si.nMax; break; case SB_LINEUP: si.nPos -= 1; break; case SB_LINEDOWN: si.nPos += 1; break; case SB_PAGEUP: si.nPos -= si.nPage; break; case SB_PAGEDOWN: si.nPos += si.nPage; break; case SB_THUMBTRACK: si.nPos = si.nTrackPos; break; default: break; } si.fMask = SIF_POS; SetScrollInfo(hwnd, SB_VERT, &si, TRUE); GetScrollInfo(hwnd, SB_VERT, &si); if (si.nPos != iVertPos) { ScrollWindow(hwnd, 0, cyChar*(iVertPos-si.nPos), NULL, NULL); UpdateWindow(hwnd); } return 0; case WM_HSCROLL: si.cbSize = sizeof(si); si.fMask = SIF_ALL; GetScrollInfo(hwnd, SB_HORZ, &si); iHorzPos = si.nPos; switch (LOWORD(wParam)) { case SB_LINELEFT: si.nPos -= 1; break; case SB_LINERIGHT: si.nPos += 1; break; case SB_PAGELEFT: si.nPos -= si.nPage; break; case SB_PAGERIGHT: si.nPos += si.nPage; break; case SB_THUMBPOSITION: si.nPos = si.nTrackPos; break; default: break; } si.fMask = SIF_POS; SetScrollInfo(hwnd, SB_HORZ, &si, TRUE); GetScrollInfo(hwnd, SB_HORZ, &si); if (si.nPos != iHorzPos) { ScrollWindow(hwnd, cxChar*(iHorzPos-si.nPos), 0, NULL, NULL); UpdateWindow(hwnd); } return 0; case WM_KEYDOWN: switch (wParam) { case VK_HOME: SendMessage(hwnd, WM_VSCROLL, SB_TOP, 0); break; case VK_END: SendMessage(hwnd, WM_VSCROLL, SB_BOTTOM, 0); break; case VK_PRIOR: SendMessage(hwnd, WM_VSCROLL, SB_PAGEUP, 0); break; case VK_NEXT: SendMessage(hwnd, WM_VSCROLL, SB_PAGEDOWN, 0); break; case VK_UP: SendMessage(hwnd, WM_VSCROLL, SB_LINEUP, 0); break; case VK_DOWN: SendMessage(hwnd, WM_VSCROLL, SB_LINEDOWN, 0); break; case VK_LEFT: SendMessage(hwnd, WM_HSCROLL, SB_PAGEUP, 0); break; case VK_RIGHT: SendMessage(hwnd, WM_HSCROLL, SB_PAGEDOWN, 0); break; } return 0; case WM_PAINT: hdc = BeginPaint(hwnd, &ps); si.cbSize = sizeof(si); si.fMask = SIF_POS; GetScrollInfo(hwnd, SB_VERT, &si); iVertPos = si.nPos; GetScrollInfo(hwnd, SB_HORZ, &si); iHorzPos = si.nPos; iPaintBeg = max(0, iVertPos + ps.rcPaint.top/cyChar); iPaintEnd = min(NUMLINES-1, iVertPos + ps.rcPaint.bottom/cyChar); for (i = iPaintBeg; i <= iPaintEnd; i++) { x = cxChar * (1-iHorzPos); y = cyChar * (i-iVertPos); TextOut(hdc, x, y, sysmetrics[i].szLabel, lstrlen(sysmetrics[i].szLabel)); TextOut(hdc, x + 22*cxCaps, y, sysmetrics[i].szDesc, lstrlen(sysmetrics[i].szDesc)); SetTextAlign(hdc, TA_RIGHT | TA_TOP); TextOut(hdc, x + 22*cxCaps + 40*cxChar, y, szBuffer, wsprintf(szBuffer, TEXT("%5d"), GetSystemMetrics(sysmetrics[i].iIndex))); // 将对齐方式设回正常方式 SetTextAlign(hdc, TA_LEFT | TA_TOP); } EndPaint(hwnd, &ps); return 0; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hwnd, message, wParam, lParam); }
有键盘了,就差鼠标了~很快会有的。
4.字符消息
通过转义状态信息可把击键消息转换为字符消息。GetMessage从消息队列中取出下一条消息;
TranslateMessage负责把击键消息转换为字符消息;
DispatchMessage调用此消息的窗口过程。
5.消息排序
假如Caps Lock没有锁定,按下再释放A,相应窗口过程会接收:1)WM_KEYDOWN:’A‘ 的虚拟键代码(0x41)
2)WM_CHAR: 'a'的字符编码(0x61)
3)WM_KEYUP: 'A' 的虚拟键代码(0x41)
按下Shift+A,释放A,再释放Shift:
1)WM_KEYDOWN:虚拟键代码VK_SHIFT(0x10)
2)WM_KEYDOWN:’A‘ 的虚拟键代码(0x41)
3)WM_CHAR: 'A' 的字符编码(0x41)
4)WM_KEYUP: 'A' 的虚拟键代码(0x41)
5)WM_UP:虚拟键代码VK_SHIFT(0x10)
连续按住A:
1)WM_KEYDOWN:’A‘ 的虚拟键代码(0x41)
2)WM_CHAR: 'a'的字符编码(0x61)
3)WM_KEYDOWN:’A‘ 的虚拟键代码(0x41)
4)WM_CHAR: 'a'的字符编码(0x61)
……
n)WM_KEYUP: 'A' 的虚拟键代码(0x41)
6.控制字符的处理
按照以下基本规则来处理击键和字符消息:如果你需要读取输入到窗口中的键盘字符,就处理WM_CHAR消息;如果你需要读取光标键、功能键、Delete键、Insert键、Shift键、Ctrl键和Alt键,则处理WM_KEYDOWN消息。/*--------------------------------------------------------------------------- keyView.cpp -- Displays keyboard and character messages ----------------------------------------------------------------------------*/ /*----------------------------------------------------------------------------------- SysMets4.cpp -- System Metrics Display Program ver4 use keyboard *----------------------------------------------------------------------------------*/ #include <windows.h> LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName[] = TEXT("KeyView1"); HWND hwnd; MSG msg; WNDCLASS wndclass; wndclass.style = CS_HREDRAW | CS_VREDRAW; wndclass.lpfnWndProc = WndProc; wndclass.cbClsExtra = 0; wndclass.cbWndExtra = 0; wndclass.hInstance = hInstance; wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION); wndclass.hCursor = LoadCursor(NULL, IDC_ARROW); wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); wndclass.lpszMenuName = NULL; wndclass.lpszClassName = szAppName; if (!RegisterClass(&wndclass)) { MessageBox(NULL, TEXT("This program requires windows NT!"), szAppName, MB_ICONERROR); return 0; } hwnd = CreateWindow(szAppName, // window class name TEXT("Keyboard Message Viewer #1"), // window caption WS_OVERLAPPEDWINDOW, // window style CW_USEDEFAULT, // initial x position CW_USEDEFAULT, // initial y position CW_USEDEFAULT, // initial x size CW_USEDEFAULT, // initial y size NULL, // parent window handle NULL, // window menu handle hInstance, // program instance handle NULL); // creation parameters ShowWindow(hwnd, iCmdShow); UpdateWindow(hwnd); while (GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam; } LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { // cxChar平均字符宽度,cyChar字符的总高度(包括外部间距),cxCaps大写字符的平均宽度 // 等宽字体中,cxCaps等于cxChar,变宽字体中,cxCaps等于cxChar的1.5倍 static int cxChar, cyChar, cxClient, cyClient, cxClientMax, cyClientMax; static int cLinesMax, cLines; static PMSG pmsg; static RECT rectScroll; static TCHAR szTop[] = TEXT ("Message Key Char ") TEXT ("Repeat Scan Ext ALT Prev Tran") ; static TCHAR szUnd[] = TEXT ("_______ ___ ____ ") TEXT ("______ ____ ___ ___ ____ ____") ; static TCHAR* szFormat[2] = { TEXT("%-13s %3d %-15s%c%6u %4d %3s %3s %4s %4s"), TEXT("%-13s 0x%04X%1s%c %6u %4d %3s %3s %4s %4s") }; static TCHAR* szYes = TEXT("Yes"); static TCHAR* szNo = TEXT("No"); static TCHAR* szDown = TEXT("Down"); static TCHAR* szUp = TEXT("Up"); static TCHAR* szMessage[] = { TEXT("WM_KEYDOWN"), TEXT("WM_KEYUP"), TEXT("WM_CHAR"), TEXT("WM_DEADCHAR"), TEXT("WM_SYSKEYDOWN"), TEXT("WM_SYSKEYUP"), TEXT("WM_SYSCHAR"), TEXT("WM_SYSDEADCHAR") }; HDC hdc; int i, iType; PAINTSTRUCT ps; TCHAR szBuffer[128], szKeyName[32]; TEXTMETRIC tm; switch (message) { case WM_CREATE: case WM_DISPLAYCHANGE: cxClientMax = GetSystemMetrics(SM_CXMAXIMIZED); cyClientMax = GetSystemMetrics(SM_CYMAXIMIZED); hdc = GetDC(hwnd); SelectObject(hdc, GetStockObject(SYSTEM_FIXED_FONT)); GetTextMetrics(hdc, &tm); // 获取系统默认字体的尺寸 cxChar = tm.tmAveCharWidth; cyChar = tm.tmHeight; ReleaseDC(hwnd, hdc); if (pmsg) free(pmsg); cLinesMax = cyClientMax / cyChar; pmsg = (PMSG)malloc(cLinesMax * sizeof(MSG)); cLines = 0; //return 0; case WM_SIZE: if (message == WM_SIZE) { cxClient = LOWORD(lParam); cyClient = HIWORD(lParam); } rectScroll.left = 0; rectScroll.right = cxClient; rectScroll.top = cyChar; rectScroll.bottom = cyChar * (cyClient / cyChar); InvalidateRect(hwnd, NULL, TRUE); return 0; case WM_KEYDOWN: case WM_KEYUP: case WM_CHAR: case WM_DEADCHAR: case WM_SYSKEYDOWN: case WM_SYSKEYUP: case WM_SYSCHAR: case WM_SYSDEADCHAR: for (i = cLinesMax-1; i > 0; i--) { pmsg[i] = pmsg[i-1]; } pmsg[0].hwnd = hwnd; pmsg[0].message = message; pmsg[0].wParam = wParam; pmsg[0].lParam = lParam; cLines = min(cLines + 1, cLinesMax); ScrollWindow(hwnd, 0, -cyChar, &rectScroll, &rectScroll); break; case WM_PAINT: hdc = BeginPaint(hwnd, &ps); SelectObject(hdc, GetStockObject(SYSTEM_FIXED_FONT)); SetBkMode(hdc, TRANSPARENT); TextOut(hdc, 0, 0, szTop, lstrlen(szTop)); TextOut(hdc, 0, 0, szUnd, lstrlen(szUnd)); for (i = 0; i < min(cLines, cyClient / cyChar - 1); i++) { iType = pmsg[i].message == WM_CHAR || pmsg[i].message == WM_SYSCHAR || pmsg[i].message == WM_DEADCHAR || pmsg[i].message == WM_SYSDEADCHAR; GetKeyNameText(pmsg[i].lParam, szKeyName, sizeof(szKeyName) / sizeof(TCHAR)); TextOut(hdc, 0, (cyClient/cyChar - 1 - i) * cyChar, szBuffer, wsprintf(szBuffer, szFormat[iType], szMessage[pmsg[i].message - WM_KEYFIRST], pmsg[i].wParam, (PTSTR)(iType ? TEXT(" ") : szKeyName), (TCHAR)(iType ? pmsg[i].wParam: ' '), LOWORD(pmsg[i].lParam), HIWORD(pmsg[i].lParam) & 0xFF, 0x01000000 & pmsg[i].lParam ? szYes : szNo, 0x20000000 & pmsg[i].lParam ? szYes : szNo, 0x40000000 & pmsg[i].lParam ? szDown: szUp, 0x80000000 & pmsg[i].lParam ? szUp : szDown)); } EndPaint(hwnd, &ps); return 0; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hwnd, message, wParam, lParam); }
7.插入符号(就是平时说的光标)
插入符号指明你输入的下一个字符将出现在屏幕上的位置。相关函数:
CreateCaret:创建和窗口关联的插入符号
SetCaretPos:设置窗口内的插入符号的位置
ShowCaret:显式插入符号
HideCaret:隐藏插入符号
DestroyCaret:销毁插入符号
GetCaretPos:获取插入符号位置
GetCaretBlinkTime、SetCaretBlinkTime:获取、设置插入符号闪烁时间
使用插入符号主要规则:在窗口过程处理WM_SETFOCUS消息时调用CreateCaret,处理WM_KILLFOCUS消息时调用DestroyCaret函数。
创建的插入符号是隐藏的,必须调用ShowCaret使之可见。
要在窗口内绘制某些东西时,它必须调用HideCaret隐藏插入符号。结束绘制后,再调用ShowCaret显式插入符号。
HideCaret效果是叠加的。
一个简单的文本编辑器雏形:
/*---------------------------------------------------------------------------- typer.cpp -- Typing Program ----------------------------------------------------------------------------*/ /*--------------------------------------------------------------------------- keyView.cpp -- Displays keyboard and character messages ----------------------------------------------------------------------------*/ /*----------------------------------------------------------------------------------- SysMets4.cpp -- System Metrics Display Program ver4 use keyboard *----------------------------------------------------------------------------------*/ #include <windows.h> LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); #define BUFFER(x, y) *(pBuffer + y*cxBuffer + x) int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName[] = TEXT("Typer"); HWND hwnd; MSG msg; WNDCLASS wndclass; wndclass.style = CS_HREDRAW | CS_VREDRAW; wndclass.lpfnWndProc = WndProc; wndclass.cbClsExtra = 0; wndclass.cbWndExtra = 0; wndclass.hInstance = hInstance; wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION); wndclass.hCursor = LoadCursor(NULL, IDC_ARROW); wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); wndclass.lpszMenuName = NULL; wndclass.lpszClassName = szAppName; if (!RegisterClass(&wndclass)) { MessageBox(NULL, TEXT("This program requires windows NT!"), szAppName, MB_ICONERROR); return 0; } hwnd = CreateWindow(szAppName, // window class name TEXT("Typer"), // window caption WS_OVERLAPPEDWINDOW, // window style CW_USEDEFAULT, // initial x position CW_USEDEFAULT, // initial y position CW_USEDEFAULT, // initial x size CW_USEDEFAULT, // initial y size NULL, // parent window handle NULL, // window menu handle hInstance, // program instance handle NULL); // creation parameters ShowWindow(hwnd, iCmdShow); UpdateWindow(hwnd); while (GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam; } LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { static DWORD dwCharSet = DEFAULT_CHARSET; static int cxChar, cyChar, cxClient, cyClient, cxBuffer, cyBuffer, xCaret, yCaret; static TCHAR* pBuffer = NULL; int x, y, i; HDC hdc; PAINTSTRUCT ps; TEXTMETRIC tm; switch (message) { case WM_INPUTLANGCHANGE: dwCharSet = wParam; case WM_CREATE: hdc = GetDC(hwnd); SelectObject(hdc, CreateFont(0, 0, 0, 0, 0, 0, 0, 0, dwCharSet, 0, 0, 0, FIXED_PITCH, NULL)); GetTextMetrics(hdc, &tm); cxChar = tm.tmAveCharWidth; cyChar = tm.tmHeight; DeleteObject(SelectObject(hdc, GetStockObject(SYSTEM_FONT))); ReleaseDC(hwnd, hdc); case WM_SIZE: if (message == WM_SIZE) { cxClient = LOWORD(lParam); cyClient = HIWORD(lParam); } cxBuffer = max(1, cxClient/cxChar); cyBuffer = max(1, cyClient/cyChar); if (pBuffer != NULL) free(pBuffer); pBuffer = (TCHAR *)malloc(sizeof(TCHAR) * cxBuffer * cyBuffer); for (y = 0; y < cyBuffer; y++) for (x = 0; x < cxBuffer; x++) BUFFER(x, y) = ' '; xCaret = 0; yCaret = 0; if (hwnd == GetFocus()) SetCaretPos(xCaret * cxChar, yCaret * cyChar); InvalidateRect(hwnd, NULL, TRUE); return 0; case WM_SETFOCUS: CreateCaret(hwnd, NULL, cxChar, cyChar); SetCaretPos(xCaret*cxChar, yCaret*cyChar); ShowCaret(hwnd); return 0; case WM_KILLFOCUS: HideCaret(hwnd); DestroyCaret(); return 0; case WM_KEYDOWN: switch (wParam) { case VK_HOME: xCaret = 0; break; case VK_END: xCaret = cxBuffer - 1; break; case VK_PRIOR: yCaret = 0; break; case VK_NEXT: yCaret = cyBuffer - 1; break; case VK_LEFT: xCaret = max(xCaret-1, 0); break; case VK_RIGHT: xCaret = min(xCaret+1, cxBuffer-1); break; case VK_UP: yCaret = max(yCaret-1, 0); break; case VK_DOWN: yCaret = min(yCaret+1, cyBuffer-1); break; case VK_DELETE: for (x = xCaret; x < cxBuffer-1; x++) BUFFER(x, yCaret) = BUFFER(x+1, yCaret); BUFFER(cxBuffer-1, yCaret) = ' '; HideCaret(hwnd); hdc = GetDC(hwnd); SelectObject(hdc, CreateFont(0, 0, 0, 0, 0, 0, 0, 0, dwCharSet, 0, 0, 0, FIXED_PITCH, NULL)); TextOut(hdc, xCaret*cxChar, yCaret*cyChar, &BUFFER(xCaret, yCaret), cxBuffer-xCaret); DeleteObject(SelectObject(hdc, GetStockObject(SYSTEM_FONT))); ReleaseDC(hwnd, hdc); ShowCaret(hwnd); break; } SetCaretPos(xCaret*cxChar, yCaret*cyChar); return 0; case WM_CHAR: for (i = 0; i < (int)LOWORD(lParam); i++) { switch (wParam) { case '\b': // backspace if (xCaret > 0) { xCaret--; SendMessage(hwnd, WM_KEYDOWN, VK_DELETE, 1); } break; case '\t': // tab do { SendMessage(hwnd, WM_CHAR, ' ', 1); } while (xCaret % 8 != 0); break; case '\n': // line feed if (++yCaret == cyBuffer) yCaret = 0; break; case '\r': // carriage return xCaret = 0; if (++yCaret == cyBuffer) yCaret = 0; break; case '\x1B': // escape for (y = 0; y < cyBuffer; y++) for (x = 0; x < cxBuffer; x++) BUFFER(x, y) = ' '; xCaret = 0; yCaret = 0; InvalidateRect(hwnd, NULL, FALSE); break; default: // character codes BUFFER(xCaret, yCaret) = (TCHAR)wParam; HideCaret(hwnd); hdc = GetDC(hwnd); SelectObject(hdc, CreateFont(0, 0, 0, 0, 0, 0, 0, 0, dwCharSet, 0, 0, 0, FIXED_PITCH, NULL)); TextOut(hdc, xCaret*cxChar, yCaret*cyChar, &BUFFER(xCaret, yCaret), 1); DeleteObject(SelectObject(hdc, GetStockObject(SYSTEM_FONT))); ReleaseDC(hwnd, hdc); ShowCaret(hwnd); if (++xCaret == cxBuffer) { xCaret = 0; if (++yCaret == cyBuffer) yCaret = 0; } break; } } SetCaretPos(xCaret*cxChar, yCaret*cyChar); return 0; case WM_PAINT: hdc = BeginPaint(hwnd, &ps); SelectObject(hdc, CreateFont(0, 0, 0, 0, 0, 0, 0, 0, dwCharSet, 0, 0, 0, FIXED_PITCH, NULL)); for (y = 0; y < cyBuffer; y++) TextOut(hdc, 0, y*cyChar, &BUFFER(0, y), cxBuffer); DeleteObject(SelectObject(hdc, GetStockObject(SYSTEM_FONT))); EndPaint(hwnd, &ps); return 0; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hwnd, message, wParam, lParam); }
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