參考資訊:
https://board.flatassembler.net/
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.asm
include "head.asm" section ".text" code readable executable proc WndProc hWnd, uMsg, wParam, lParam mov eax, [uMsg] cmp eax, WM_VSCROLL je .handle_vscroll cmp eax, WM_CLOSE je .handle_close cmp eax, WM_DESTROY je .handle_destroy invoke CallWindowProc, [pDefWndProc], [hWnd], [uMsg], [wParam], [lParam] jmp .finish .handle_vscroll: cmp word [wParam], SB_LINEUP je .handle_sb_line_up cmp word [wParam], SB_LINEDOWN je .handle_sb_line_down cmp word [wParam], SB_PAGEUP je .handle_sb_page_up cmp word [wParam], SB_PAGEDOWN je .handle_sb_page_down jmp .finish .handle_sb_line_up: invoke SetWindowText, [hWnd], SLUP jmp .finish .handle_sb_line_down: invoke SetWindowText, [hWnd], SLDN jmp .finish .handle_sb_page_up: invoke SetWindowText, [hWnd], SPUP jmp .finish .handle_sb_page_down: invoke SetWindowText, [hWnd], SPDN jmp .finish .handle_close: invoke DestroyWindow, [hWnd] xor eax, eax jmp .finish .handle_destroy: invoke PostQuitMessage, 0 xor eax, eax jmp .finish .finish: ret endp proc WinMain hInst, hPrevInst, CmdLine, CmdShow local msg:MSG invoke CreateWindowEx, WS_EX_LEFT, WC_DIALOG, szName, \ WS_OVERLAPPEDWINDOW or WS_VISIBLE or WS_VSCROLL, 0, 0, 300, 300, NULL, NULL, NULL, NULL mov [hWin], eax invoke SetWindowLong, [hWin], GWL_WNDPROC, WndProc mov [pDefWndProc], eax invoke SetScrollRange, [hWin], SB_VERT, 0, 100, FALSE invoke SetScrollPos, [hWin], SB_VERT, 50, TRUE @@: lea eax, [msg] invoke GetMessage, eax, NULL, 0, 0 cmp eax, 0 je @f lea eax, [msg] invoke DispatchMessage, eax jmp @b @@: mov eax, [msg.wParam] ret endp start: invoke GetModuleHandle, NULL mov [hInstance], eax invoke GetCommandLine mov [pCommand], eax stdcall WinMain, [hInstance], NULL, [pCommand], SW_SHOWNORMAL invoke ExitProcess, eax
Line 26~40:處理Scrollbar訊息並且顯示在視窗標題
Line 60:WS_VSCROLL是垂直的Scrollbar,WS_HSCROLL則是水平的Scrollbar
Line 66:設定Scrollbar最大的範圍
Line 67:設定Scrollbar目前的位置
完成