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本帖最后由 weijunyu 于 2018-11-19 21:08 编辑
来个大佬帮我看看什么情况,处理键盘消息的时候,文本内容重绘了,但是滚动条没重绘。
- //滚动条和显示文本
- #include <windows.h>;
- #include "strsafe.h";
- #include "SysMets.h";
- LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
- int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow) {
- HWND hwnd;
- MSG msg;
- static TCHAR szAppName[] = TEXT("MyWindows");//指定窗口类名,面向程序员
- WNDCLASS wndclass;
- wndclass.style = CS_HREDRAW | CS_VREDRAW;//窗口风格
- wndclass.lpfnWndProc = WndProc;//回调函数
- wndclass.cbClsExtra = 0;//预留的额外空间
- wndclass.cbWndExtra = 0;//预留的额外空间
- wndclass.hInstance = hInstance;//该窗口的句柄
- wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);//为所有基于该窗口类的窗口设定一个图标
- wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);//为所有基于该窗口类的窗口设定一个鼠标指针
- wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);//指定窗口背景色
- wndclass.lpszMenuName = NULL;
- wndclass.lpszClassName = szAppName;//指定窗口类名,面向程序员
- RegisterClass(&wndclass);
- hwnd = CreateWindow(
- szAppName,
- TEXT("WindowsApp"),
- WS_OVERLAPPEDWINDOW | WS_VSCROLL,
- 0,
- 0,
- 800,
- 600,
- NULL,
- NULL,
- hInstance,
- NULL
- );
- 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) {
- TCHAR szBuffer[128];
- HDC hdc;
- static int cxChar,cxCaps,cyChar,cxClient, cyClient;
- static size_t iTarget,iTarget1;
- TEXTMETRIC tm;
- size_t i = 0;
- int yPos,FirstLine,LastLine;
- SCROLLINFO si;
- PAINTSTRUCT ps;
- switch (message)
- {
- case WM_CREATE:
- hdc = GetDC(hwnd);
- //获取窗口尺寸
- GetTextMetrics(hdc,&tm);
- //每个字符的平均宽度
- cxChar = tm.tmAveCharWidth;
- //每个字符的实际宽度
- cxCaps = (tm.tmPitchAndFamily & 1 ? 3 : 2) * cxChar / 2;
- //字符的高度
- cyChar = tm.tmHeight + tm.tmExternalLeading;
- ReleaseDC(hwnd, hdc);
- case WM_SIZE:
- cxClient = LOWORD(lParam);
- cyClient = HIWORD(lParam);
- si.cbSize = sizeof(si);
- si.fMask = SIF_PAGE | SIF_RANGE;
- si.nMin = 0;
- si.nMax = NUMLINES - 1;
- si.nPage = cyClient / cyChar;
- SetScrollInfo(hwnd, SB_VERT, &si, FALSE);
- case WM_VSCROLL:
- hdc = GetDC(hwnd);
- SetTextAlign(hdc, TA_TOP | TA_RIGHT);
- si.cbSize = sizeof(si);
- si.fMask = SIF_ALL;
- GetScrollInfo(hwnd, SB_VERT, &si);
- yPos = si.nPos;
- switch (LOWORD(wParam))
- {
- case SB_TOP:
- si.nPos = si.nMin;
- break;
- case SB_BOTTOM:
- si.nPos = si.nMax;
- break;
- case SB_LINEDOWN:
- si.nPos++;
- break;
- case SB_PAGEDOWN:
- si.nPos += cyClient / cyChar;
- break;
- case SB_PAGEUP:
- si.nPos -= cyClient / cyChar;
- break;
- case SB_LINEUP:
- si.nPos--;
- break;
- case SB_THUMBTRACK:
- si.nPos = si.nTrackPos;
- break;
- }
- ReleaseDC(hwnd, hdc);
- //设置滚动条的新位置
- si.fMask = SIF_POS;
- SetScrollInfo(hwnd, SB_VERT, &si, FALSE);
- //获得滚动条的位置
- GetScrollInfo(hwnd, SB_VERT, &si);
- if (yPos != si.nPos)
- {
- ScrollWindow(hwnd, 0, cyChar * (yPos - si.nPos), NULL, NULL);
- /*UpdateWindow(hwnd);*/
- }
-
- return 0;
- case WM_PAINT:
- hdc = BeginPaint(hwnd, &ps);
- //获得滚动条的位置
- si.cbSize = sizeof(&si);
- si.fMask = SIF_POS;
- GetScrollInfo(hwnd, SB_VERT, &si);
- yPos = si.nPos;
- //计算需要重绘的区域
- FirstLine = max(0, yPos + ps.rcPaint.top / cyChar);
- LastLine = min(NUMLINES - 1, yPos + ps.rcPaint.bottom / cyChar);
- for (size_t i = FirstLine; i < LastLine; i++)
- {
- int y = cyChar * (i - yPos);
- //第一列
- StringCchLength(sysmetrics[i].szLabel, 1024, &iTarget);
- TextOut(hdc , 0 , y , sysmetrics[i].szLabel, iTarget);
- //第二列
- StringCchLength(sysmetrics[i].szDesc, 12, &iTarget);
- TextOut(hdc,17 * cxCaps, y, sysmetrics[i].szDesc, iTarget == 0 ? 12 : iTarget);
- //第三列
- SetTextAlign(hdc, TA_TOP | TA_RIGHT);
- StringCchPrintf(szBuffer, 10,TEXT("%i"), GetSystemMetrics(sysmetrics[i].iIndex));
- StringCchLength(szBuffer, 10, &iTarget);
- TextOut(hdc, 40 * cxCaps, y, szBuffer, iTarget);
- SetTextAlign(hdc, TA_TOP | TA_LEFT);
- }
- EndPaint(hwnd, &ps);
- break;
- case WM_KEYDOWN:
- switch (wParam)
- {
- case VK_DOWN:
- SendMessage(hwnd, WM_VSCROLL, SB_LINEDOWN, 0);
- break;
- case VK_UP:
- SendMessage(hwnd, WM_VSCROLL, SB_LINEUP, 0);
- break;
- 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;
- }
- return 0;
- case WM_DESTROY:
- PostQuitMessage(0);
- break;
- default:
- return DefWindowProc(hwnd, message, wParam, lParam);
- }
- };
复制代码
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