[英]WM_MOVING, LPARAM Gives Wrong values on aero snap
我正在开发一个 win32 项目,该项目使用来自WndProc
的WM_MOVING
消息来检测新的 position,其中 window 被移动。 但是当我尝试将 window 捕捉到左侧时,LPARAM 仅在一毫秒内给出错误值,然后给出实际值。
请查看 output:
Left: 0, Right:683
Left: -205, Right:295
Left: 0, Right:683
Left: -205, Right:295
Left: 0, Right:683
Left: -205, Right:295
真正的 output 是 -205 但在两者之间我得到零,这导致我的 window 的内容闪烁。 在我的情况下,内容的 position 取决于 window position,因此如果我收到错误的值,它会导致闪烁。
这是我想要实现的目标:手动创建丙烯酸效果
每当我在此模式下(就在航空快照模式之前)移动 window 时,该值将变为零。
这仅影响 window 的Top
和Left
坐标,并且在气动捕捉到任何侧面时也会闪烁。
这是一个简单的可复制示例:
#ifndef UNICODE
#define UNICODE
#endif
#include <windows.h>
#include <stdio.h>
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
RECT* hostRect;
char buffer[200];
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)
{
const wchar_t CLASS_NAME[] = L"Sample Window Class";
WNDCLASS wc = { };
wc.lpfnWndProc = WindowProc;
wc.hInstance = hInstance;
wc.lpszClassName = CLASS_NAME;
RegisterClass(&wc);
HWND hwnd = CreateWindowEx(0,CLASS_NAME,L"Learn to Program Windows",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,NULL,NULL,hInstance,NULL);
if (hwnd == NULL)
{
return 0;
}
ShowWindow(hwnd, nCmdShow);
MSG msg = { };
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_MOVING:
{
hostRect = reinterpret_cast<RECT*>(lParam);
sprintf_s(buffer, "Left: %d, Top:%d, Right:%d, Bottom:%d\n", hostRect->left, hostRect->top, hostRect->right, hostRect->bottom);
OutputDebugStringA(buffer);
}
case WM_DESTROY:
PostQuitMessage(0);
return 0;
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
FillRect(hdc, &ps.rcPaint, (HBRUSH)(COLOR_WINDOW + 1));
EndPaint(hwnd, &ps);
}
return 0;
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
运行此程序并检查 output 中的值,同时将 window 移动到任何一侧以进行气动捕捉。
注意:在我的情况下,我将无法在WM_MOVING
中使用GetWindowRect()
,因为调用GetWindowRect()
会减慢我的 window 中的 render() function(只是一个 directx 绘画)。
您可以尝试对 window 的样式进行临时更改。
这是一个例子:
#ifndef UNICODE
#define UNICODE
#endif
#include <windows.h>
#include <stdio.h>
#define WM_RESTOREORIGINALSTYLE WM_USER + 1
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
RECT* hostRect;
char buffer[200];
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)
{
const wchar_t CLASS_NAME[] = L"Sample Window Class";
WNDCLASS wc = { };
wc.lpfnWndProc = WindowProc;
wc.hInstance = hInstance;
wc.lpszClassName = CLASS_NAME;
RegisterClass(&wc);
HWND hwnd = CreateWindowEx(0, CLASS_NAME, L"Learn to Program Windows", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);
if (hwnd == NULL)
{
return 0;
}
ShowWindow(hwnd, nCmdShow);
MSG msg = { };
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_MOVING:
{
hostRect = reinterpret_cast<RECT*>(lParam);
sprintf_s(buffer, "Left: %d, Top:%d, Right:%d, Bottom:%d\n", hostRect->left, hostRect->top, hostRect->right, hostRect->bottom);
OutputDebugStringA(buffer);
break;
}
case WM_SYSCOMMAND:
{
if (wParam == (SC_MOVE | 2)) wParam = SC_SIZE | 9;
if ((wParam & 0xFFE0) == SC_SIZE && (wParam & 0x000F)) // handles MOVE and SIZE in one "if"
{
long int oldStyle = GetWindowLongW(hwnd, GWL_STYLE);
PostMessageW(hwnd, WM_RESTOREORIGINALSTYLE, GWL_STYLE, oldStyle);
SetWindowLongW(hwnd, GWL_STYLE, oldStyle & 0xFEFEFFFF); // disable WS_MAXIMIZE and WS_MAXIMIZEBOX
DefWindowProcW(hwnd, WM_SYSCOMMAND, wParam, lParam);
return 0;
}
return DefWindowProcW(hwnd, WM_SYSCOMMAND, wParam, lParam);
}
case WM_RESTOREORIGINALSTYLE:
{
if ((long int)wParam == GWL_STYLE)
SetWindowLongW(hwnd, GWL_STYLE, lParam);
return 0;
}
case WM_DESTROY:
PostQuitMessage(0);
return 0;
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
FillRect(hdc, &ps.rcPaint, (HBRUSH)(COLOR_WINDOW + 1));
EndPaint(hwnd, &ps);
}
return 0;
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
更多参考: Win32 防止 window “snap”
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.