如何在控制VC ++滚动条的Win32 API [英] how to control scrollbar in vc++ win32 api
问题描述
基本上我有可进行其它控件，比方说按钮，位图，文本框等自定义窗口，现在的事情是，如果该项目走到窗外，我的意思是，如果我想很明显创建像20按钮它会走出去的窗口，所以我想我应该创建一个滚动条，使窗口滚动能力。显然，你不能添加WS_VSCROLL或WS_HSCROLL引起的向上和向下的箭头，它不会是即使点击，但如果你试图拖动滑块，将跳转刚刚复出顶端。所以我想我更好地创造与CreateWindow的（）函数，滚动条和控制的东西，剩下的。
basically i have a custom window which can carry other controls, let's say buttons, bitmaps, text boxes and etc, now the thing is that if the items went out of window, i mean if i tried to create like 20 button obviously it will go out of window, so i thought i should create a scroll bar to make the window scroll able. obviously you can't add WS_VSCROLL or WS_HSCROLL cause the up and down arrow of it won't be even clickable but if you tried to drag the thumb it will jump just back to the top. so i thought i better create a scroll bar with createwindow() function and control the rest of stuff.
下面是code如何创建窗口本身和滚动条：
code：
Here is the code how i create the window itself and the scroll bar: Code:
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
hInst = hInstance; // Store instance handle in our global variable
hWnd = CreateWindow(szWindowClass, "Name", WS_OVERLAPPEDWINDOW/*WS_OVERLAPPED | WS_MINIMIZEBOX | WS_SYSMENU*/,
CW_USEDEFAULT, 0, 1014, 585, NULL, NULL, hInstance, NULL);
if (!hWnd)
{
return FALSE;
}
WNDCLASSEX wcs;
wcs.cbSize = sizeof(wcs);
wcs.lpszClassName = szClassName;
wcs.hInstance = GetModuleHandle(0);
wcs.lpfnWndProc = CustWndProc;
wcs.hCursor = LoadCursor(NULL, IDC_ARROW);
wcs.hIcon = 0;
wcs.lpszMenuName = 0;
wcs.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcs.style = 0;
wcs.cbClsExtra = 0;
wcs.cbWndExtra = 0;
wcs.hIconSm = 0;
if(!RegisterClassEx(&wcs))
{
MessageBox(NULL, "Window Registration Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
hwndCtrl = CreateWindowEx(
0L, // give it a standard border
szClassName,
_T("A custom control"),
WS_VISIBLE|WS_CHILD|WS_BORDER,
0, 0, 0, 0,
hWnd,
NULL, GetModuleHandle(0), CustWndProc
);
ShowWindow (hwndCtrl, SW_SHOW);
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
这里是code处理其消息：
here is the code for handling its messages:
LRESULT CALLBACK CustWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
RECT rc = {};
GetClientRect(hwnd, &rc);
const SIZE sz = { rc.right - rc.left, rc.bottom - rc.top };
SCROLLINFO si;
switch(msg)
{
case WM_MOUSEHOVER:
::MessageBox(hwnd, "Enter", "Info", MB_OK);
return 0;
case WM_CREATE:
int w , h;
w = 10;
h = 10;
HWND buttons;
for(h=10;h<500; h+=35){
buttons = CreateWindow("BUTTON", "How", WS_VISIBLE|WS_CHILD, w, h, 50, 30, hwnd, (HMENU)1231,NULL, NULL);
}
int width, height;
width = LOWORD(lParam); // Width Size of hWnd
height = HIWORD(lParam);
Scrollbar = CreateWindowEx(0L,
"SCROLLBAR",
NULL, // There is no text to display
WS_CHILD | WS_VISIBLE | SBS_VERT,
980,
47,
18,
405,
hWnd,
NULL,
hInst,
NULL
);
return 0;
case WM_INITDIALOG:
ZeroMemory(&si, sizeof(si));
si.cbSize = sizeof(si);
si.fMask = SIF_RANGE | SIF_PAGE | SIF_POS;
si.nMin = 0;
si.nMax = 1000;
si.nPage = 10;
si.nPos = 54;
SetScrollInfo(Scrollbar, SB_CTL, &si, TRUE);
return TRUE;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return FALSE;
}
你可以看到有哪些会自动与正在创建循环和滚动条本身被创建后，一些按钮，现在我不知道如何使它向下滚动，并如此等等。
所有答复都欢迎。
as you can see there are some buttons which is automatically being created with for loop and after that the scroll bar itself is being created, now i don't know how to make it scroll down and up and so and so forth. All replies are welcomed
推荐答案
一个快速和肮脏的例子：
A quick and dirty example:
case WM_VSCROLL:
{
auto action = LOWORD(wParam);
HWND hScroll = (HWND)lParam;
int pos = -1;
if (action == SB_THUMBPOSITION || action == SB_THUMBTRACK) {
pos = HIWORD(wParam);
} else if (action == SB_LINEDOWN) {
pos = g_scrollY + 30;
} else if (action == SB_LINEUP) {
pos = g_scrollY - 30;
}
if (pos == -1)
break;
WCHAR buf[20];
SCROLLINFO si = { 0 };
si.cbSize = sizeof(SCROLLINFO);
si.fMask = SIF_POS;
si.nPos = pos;
si.nTrackPos = 0;
SetScrollInfo(hWnd, SB_VERT, &si, true);
GetScrollInfo(hWnd, SB_VERT, &si);
pos = si.nPos;
POINT pt;
pt.x = 0;
pt.y = pos - g_scrollY;
auto hdc = GetDC(hWnd);
LPtoDP(hdc, &pt, 1);
ReleaseDC(hWnd, hdc);
ScrollWindow(hWnd, 0, -pt.y, NULL, NULL);
g_scrollY = pos;
return 0;
}
case WM_CREATE:
{
for (int i = 0; i < 100; ++i) {
auto hEdit = CreateWindowEx(WS_EX_CLIENTEDGE, L"EDIT", L"",
WS_CHILD | WS_VISIBLE | ES_AUTOHSCROLL, 10, 30 * i, 250, 21, hWnd, NULL, hInst, NULL);
wchar_t buf[10];
StringCchPrintf(buf, 10, L"%d", i);
SetWindowText(hEdit, buf);
}
RECT rc = { 0 };
GetClientRect(hWnd, &rc);
SCROLLINFO si = { 0 };
si.cbSize = sizeof(SCROLLINFO);
si.fMask = SIF_ALL;
si.nMin = 0;
si.nMax = 30 * 99 + 21;
si.nPage = (rc.bottom - rc.top);
si.nPos = 0;
si.nTrackPos = 0;
SetScrollInfo(hWnd, SB_VERT, &si, true);
return 0;
}
效果：
![滚动效应](\"http://i.stack.imgur.com/xjDNj.gif\")
全部code： http://pastebin.com/byE1xFsb
由于OP无法理解的code，这里是解释：
Since OP cannot understand the code, here is the explanation:
-
窗口的整个高度应为30 * 99 + 21 99为编辑数，21是编辑控件的高度。
The whole height of the window should be 30 * 99 + 21. 99 is the edit count, 21 is the edit control's height.
为窗口滚动范围应 [0，30 * 99 + 21 - 客户区域高度] 。 30 * 99 + 21 - 客户区高度+客户区高度等于 30 * 99 + 21 这是窗口的整个高度
The scroll range for the window should be [0, 30 * 99 + 21 - client-area-height]. 30 * 99 + 21 - client-area-height + client-area-height equals to 30 * 99 + 21 which is the whole height of the window.
要确保上述滚动范围，
si.nMax = 30 * 99 + 21;
si.nPage = (rc.bottom - rc.top);
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