參考網站:
http://winapi.freetechsecrets.com/win32/
http://masm32.com/board/index.php?topic=3584.0
https://www.plantation-productions.com/Webster/
https://www.plantation-productions.com/Webster/Win32Asm/win32API.html
當視窗的可視區域(如:300x300像素)小於顯示圖片大小(如:640x480像素)時,這時可以使用Windows視窗元件Scrollbar,用來做顯示位置調整的動作,Scrollbar元件有垂直和水平兩種方向並且提供視窗事件回報機制(WM_VSCROLL、WM_HSCROLL),因此,這裡的Scrollbar元件並不能夠自動幫忙做顯示位置調整的動作,取而代之的是,在收到WM_VSCROLL、WM_HSCROLL事件時,使用者必須自己決定哪些東西要顯示在視窗的可視區域上
main.hla
program main; #include("w.hhf") #include("args.hhf") #include("memory.hhf") #include("strings.hhf") static hWin: dword; hInstance: dword; CommandLine: string; defWndProc: dword; readonly SLUP: string:= "LINE++"; SLDN: string:= "LINE--"; SPUP: string:= "PAGE++"; SPDN: string:= "PAGE--"; szCaption: string:= "main"; procedure WndProc(hWnd:dword; uMsg:uns32; wParam:dword; lParam:dword); @stdcall; begin WndProc; if (uMsg == w.WM_VSCROLL) then mov(wParam, eax); and($ffff, eax); if (eax == w.SB_LINEUP) then w.SetWindowText(hWnd, SLUP); elseif (eax == w.SB_LINEDOWN) then w.SetWindowText(hWnd, SLDN); elseif (eax == w.SB_PAGEUP) then w.SetWindowText(hWnd, SPUP); elseif (eax == w.SB_PAGEDOWN) then w.SetWindowText(hWnd, SPDN); endif; xor(eax, eax); elseif (uMsg == w.WM_CLOSE) then w.DestroyWindow(hWnd); xor(eax, eax); elseif (uMsg == w.WM_DESTROY) then w.PostQuitMessage(0); xor(eax, eax); else w.CallWindowProc(defWndProc, hWnd, uMsg, wParam, lParam); endif; end WndProc; procedure WinMain(hInst:dword; hPrevInst:dword; CmdLine:string; CmdShow:dword); var msg: w.MSG; begin WinMain; w.CreateWindowEx(w.WS_EX_LEFT, w.WC_DIALOG, szCaption, w.WS_OVERLAPPEDWINDOW | w.WS_VISIBLE | w.WS_VSCROLL, 0, 0, 300, 300, 0, 0, NULL, NULL); mov(eax, hWin); w.SetWindowLong(hWin, w.GWL_WNDPROC, &WndProc); mov(eax, defWndProc); w.SetScrollRange(hWin, w.SB_VERT, 0, 100, false); w.SetScrollPos(hWin, w.SB_VERT, 50, true); forever w.GetMessage(msg, NULL, 0, 0); breakif(!eax); w.DispatchMessage(msg); endfor; mov(msg.wParam, eax); end WinMain; begin main; w.GetModuleHandle(NULL); mov(eax, hInstance); mov(arg.cmdLn(), CommandLine); WinMain(hInstance, NULL, CommandLine, w.SW_SHOWNORMAL); w.ExitProcess(eax); end main;
Line 23~35:處理Scrollbar訊息並且顯示在視窗標題
Line 53:WS_VSCROLL是垂直的Scrollbar,WS_HSCROLL則是水平的Scrollbar
Line 59:設定Scrollbar最大的範圍
Line 60:設定Scrollbar目前的位置
完成