[英]WM_MOVING, LPARAM Gives Wrong values on aero snap
我正在開發一個 win32 項目,該項目使用來自WndProc
的WM_MOVING
消息來檢測新的 position,其中 window 被移動。 但是當我嘗試將 window 捕捉到左側時,LPARAM 僅在一毫秒內給出錯誤值,然后給出實際值。
請查看 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 但在兩者之間我得到零,這導致我的 window 的內容閃爍。 在我的情況下,內容的 position 取決於 window position,因此如果我收到錯誤的值,它會導致閃爍。
這是我想要實現的目標:手動創建丙烯酸效果
每當我在此模式下(就在航空快照模式之前)移動 window 時,該值將變為零。
這僅影響 window 的Top
和Left
坐標,並且在氣動捕捉到任何側面時也會閃爍。
這是一個簡單的可復制示例:
#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);
}
運行此程序並檢查 output 中的值,同時將 window 移動到任何一側以進行氣動捕捉。
注意:在我的情況下,我將無法在WM_MOVING
中使用GetWindowRect()
,因為調用GetWindowRect()
會減慢我的 window 中的 render() function(只是一個 directx 繪畫)。
您可以嘗試對 window 的樣式進行臨時更改。
這是一個例子:
#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);
}
更多參考: Win32 防止 window “snap”
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