VC对话框加滚动条示例

//////////////////////////////////////////////////////////////////////////////// // #include "StdAfx.h" INT_PTR CALLBACK SD_DialogProc( HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam ); //////////////////////////////////////////////////////////////////////////////// // int WINAPI _tWinMain( HINSTANCE hInstance, HINSTANCE /*hPrevInstance*/, LPWSTR /*lpCmdLine*/, int /*nShowCmd*/) { DialogBox( hInstance, MAKEINTRESOURCE(IDD_DIALOG1), GetDesktopWindow(), SD_DialogProc); return 0; } //////////////////////////////////////////////////////////////////////////////// // BOOL SD_OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam); void SD_OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify); void SD_OnSize(HWND hwnd, UINT state, int cx, int cy); void SD_OnHScroll(HWND hwnd, HWND hwndCtl, UINT code, int pos); void SD_OnVScroll(HWND hwnd, HWND hwndCtl, UINT code, int pos); void SD_OnHVScroll(HWND hwnd, int bar, UINT code); void SD_ScrollClient(HWND hwnd, int bar, int pos); int SD_GetScrollPos(HWND hwnd, int bar, UINT code); INT_PTR CALLBACK SD_DialogProc( HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam) { switch(uMsg) { HANDLE_MSG(hwndDlg, WM_INITDIALOG, SD_OnInitDialog); HANDLE_MSG(hwndDlg, WM_COMMAND, SD_OnCommand); HANDLE_MSG(hwndDlg, WM_SIZE, SD_OnSize); HANDLE_MSG(hwndDlg, WM_HSCROLL, SD_OnHScroll); HANDLE_MSG(hwndDlg, WM_VSCROLL, SD_OnVScroll); } return FALSE; } BOOL SD_OnInitDialog(HWND hwnd, HWND /*hwndFocus*/, LPARAM /*lParam*/) { RECT rc = {}; GetClientRect(hwnd, &rc); const SIZE sz = { rc.right - rc.left, rc.bottom - rc.top }; SCROLLINFO si = {}; si.cbSize = sizeof(SCROLLINFO); si.fMask = SIF_PAGE | SIF_POS | SIF_RANGE; si.nPos = si.nMin = 1; si.nMax = sz.cx; si.nPage = sz.cx; SetScrollInfo(hwnd, SB_HORZ, &si, FALSE); si.nMax = sz.cy; si.nPage = sz.cy; SetScrollInfo(hwnd, SB_VERT, &si, FALSE); return FALSE; } void SD_OnCommand(HWND hwnd, int id, HWND /*hwndCtl*/, UINT /*codeNotify*/) { switch(id) { case IDOK: case IDCANCEL: EndDialog(hwnd, 0); break; } } void SD_OnSize(HWND hwnd, UINT state, int cx, int cy) { if(state != SIZE_RESTORED && state != SIZE_MAXIMIZED) return; SCROLLINFO si = {}; si.cbSize = sizeof(SCROLLINFO); const int bar[] = { SB_HORZ, SB_VERT }; const int page[] = { cx, cy }; for(size_t i = 0; i < ARRAYSIZE(bar); ++i) { si.fMask = SIF_PAGE; si.nPage = page[i]; SetScrollInfo(hwnd, bar[i], &si, TRUE); si.fMask = SIF_RANGE | SIF_POS; GetScrollInfo(hwnd, bar[i], &si); const int maxScrollPos = si.nMax - (page[i] - 1); // Scroll client only if scroll bar is visible and window's // content is fully scrolled toward right and/or bottom side. // Also, update window's content on maximize. const bool needToScroll = (si.nPos != si.nMin && si.nPos == maxScrollPos) || (state == SIZE_MAXIMIZED); if(needToScroll) { SD_ScrollClient(hwnd, bar[i], si.nPos); } } } void SD_OnHScroll(HWND hwnd, HWND /*hwndCtl*/, UINT code, int /*pos*/) { SD_OnHVScroll(hwnd, SB_HORZ, code); } void SD_OnVScroll(HWND hwnd, HWND /*hwndCtl*/, UINT code, int /*pos*/) { SD_OnHVScroll(hwnd, SB_VERT, code); } void SD_OnHVScroll(HWND hwnd, int bar, UINT code) { const int scrollPos = SD_GetScrollPos(hwnd, bar, code); if(scrollPos == -1) return; SetScrollPos(hwnd, bar, scrollPos, TRUE); SD_ScrollClient(hwnd, bar, scrollPos); } void SD_ScrollClient(HWND hwnd, int bar, int pos) { static int s_prevx = 1; static int s_prevy = 1; int cx = 0; int cy = 0; int& delta = (bar == SB_HORZ ? cx : cy); int& prev = (bar == SB_HORZ ? s_prevx : s_prevy); delta = prev - pos; prev = pos; if(cx || cy) { ScrollWindow(hwnd, cx, cy, NULL, NULL); } } int SD_GetScrollPos(HWND hwnd, int bar, UINT code) { SCROLLINFO si = {}; si.cbSize = sizeof(SCROLLINFO); si.fMask = SIF_PAGE | SIF_POS | SIF_RANGE | SIF_TRACKPOS; GetScrollInfo(hwnd, bar, &si); const int minPos = si.nMin; const int maxPos = si.nMax - (si.nPage - 1); int result = -1; switch(code) { case SB_LINEUP /*SB_LINELEFT*/: result = max(si.nPos - 1, minPos); break; case SB_LINEDOWN /*SB_LINERIGHT*/: result = min(si.nPos + 1, maxPos); break; case SB_PAGEUP /*SB_PAGELEFT*/: result = max(si.nPos - (int)si.nPage, minPos); break; case SB_PAGEDOWN /*SB_PAGERIGHT*/: result = min(si.nPos + (int)si.nPage, maxPos); break; case SB_THUMBPOSITION: // do nothing break; case SB_THUMBTRACK: result = si.nTrackPos; break; case SB_TOP /*SB_LEFT*/: result = minPos; break; case SB_BOTTOM /*SB_RIGHT*/: result = maxPos; break; case SB_ENDSCROLL: // do nothing break; } return result; }