如何基于Windows API写一个可以上下翻动的窗口,请写出具体代码
时间: 2024-03-09 09:48:26 浏览: 28
好的,以下是一个简单的基于Windows API的可以上下翻动的窗口的代码示例:
```c++
#include <windows.h>
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
// 注册窗口类
WNDCLASSEX wcex = {};
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.lpfnWndProc = WndProc;
wcex.hInstance = hInstance;
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.lpszClassName = "MyWindowClass";
RegisterClassEx(&wcex);
// 创建窗口
HWND hWnd = CreateWindow("MyWindowClass", "My Window", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 640, 480, NULL, NULL, hInstance, NULL);
// 创建滚动条控件
HWND hScrollBar = CreateWindow("SCROLLBAR", NULL, WS_CHILD | WS_VISIBLE | SBS_VERT, 600, 0, 20, 480, hWnd, NULL, hInstance, NULL);
SetScrollRange(hScrollBar, SB_CTL, 0, 100, TRUE);
SetScrollPos(hScrollBar, SB_CTL, 0, TRUE);
// 显示窗口
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
// 消息循环
MSG msg = {};
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return (int)msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int nPos = 0;
switch (message)
{
case WM_VSCROLL:
switch (LOWORD(wParam))
{
case SB_LINEUP:
nPos--;
break;
case SB_LINEDOWN:
nPos++;
break;
case SB_PAGEUP:
nPos -= 10;
break;
case SB_PAGEDOWN:
nPos += 10;
break;
case SB_THUMBPOSITION:
nPos = HIWORD(wParam);
break;
}
nPos = max(0, min(nPos, 100));
SetScrollPos((HWND)lParam, SB_CTL, nPos, TRUE);
InvalidateRect(hWnd, NULL, TRUE);
break;
case WM_PAINT:
// 绘制窗口内容
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hWnd, &ps);
RECT rect;
GetClientRect(hWnd, &rect);
rect.top -= nPos * rect.bottom / 100;
DrawText(hdc, "This is a scrollable window.", -1, &rect, DT_CENTER | DT_VCENTER | DT_SINGLELINE);
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
```
这个示例代码创建了一个窗口,窗口右侧有一个垂直滚动条控件,可以通过鼠标拖动或按上下箭头、PageUp/PageDown键来滚动窗口内容。窗口内容是一个居中显示的文本字符串,根据滚动条的位置来调整文本的绘制位置。注意,这只是一个非常基本的示例代码,实际应用中可能需要更复杂的绘图和滚动逻辑。
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