c++:使用全局鼠标钩子重新定位窗口
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【中文标题】c++:使用全局鼠标钩子重新定位窗口【英文标题】:c++: window re-position with global mouse hook 【发布时间】:2017-08-31 03:54:28 【问题描述】:我正在尝试开发像桌面分隔器这样的应用程序。 我使用了全局鼠标钩子(低级鼠标钩子),因为在将窗口拖动到特定位置后左键向上时,窗口位于特定位置并调整大小。 首先,当左键向上时,我尝试将窗口重新定位到桌面屏幕的左角。 我使用 SetWindowPos 方法重新定位和调整大小,但效果不佳。 当我释放左按钮时,窗口位于特定位置,但它立即返回到原始位置。 在调试应用程序时,它会很好地进入屏幕的左角。 我不知道为什么会发生这种情况。 以下是我的代码。
LRESULT CALLBACK LowLevelMouseProc(int code, WPARAM wParam, LPARAM lParam)
if ( code != HC_ACTION )
return CallNextHookEx(hMouseHook, code, wParam, lParam);
switch (wParam)
case WM_LBUTTONDOWN:
TRACE("Down\n");
// To get window handle from current mouse position
::GetCursorPos(&mouse_pos);
hCurrentWnd = ::WindowFromPoint(mouse_pos);
LButton_Down = true;
Window_Drag = false; // Initialize Window_Drag variable
Mouse_Drag = false;
while (hCurrentWnd != 0)
style = ::GetWindowLong(hCurrentWnd, GWL_STYLE);
const int x = style & (WS_POPUP | WS_CHILD);
if ((x == WS_OVERLAPPED) || (x == WS_POPUP)) break;
// we also want to manipulate mdi childs that
// aren't maximized
if ((!(style & WS_MAXIMIZE)) && (::GetWindowLong(hCurrentWnd, GWL_EXSTYLE) & WS_EX_MDICHILD)) break;
hCurrentWnd = ::GetParent(hCurrentWnd);
if (IgnoreWindow())
return CallNextHookEx(hMouseHook, code, wParam, lParam);
// check if the alt key is pressed while a mouse button is pressed
// and switch to the appropriate mode
switch (wParam)
case WM_LBUTTONDOWN:
LButton_Down = true;
break;
default:
return CallNextHookEx(hMouseHook, code, wParam, lParam);
if (hCurrentWnd == 0)
return CallNextHookEx(hMouseHook, code, wParam, lParam);
HWND parent = ::GetParent(hCurrentWnd);
// remember the window size and position
::GetWindowRect(hCurrentWnd, &rDown);
if ( ( parent ) && ( ( style & WS_POPUP ) == 0 ) )
::ScreenToClient(parent, (POINT*)&rDown.left);
::ScreenToClient(parent, (POINT*)&rDown.right);
// we're getting serious - capture the mouse
SetCapture(hCurrentWnd);
return CallNextHookEx(hMouseHook, code, wParam, lParam);
case WM_MOUSEMOVE:
TRACE("Move\n");
if ( !LButton_Down )
return CallNextHookEx(hMouseHook, code, wParam, lParam);
else
Mouse_Drag = true;
TRACE("Mouse Drag - True\n");
::GetWindowRect(hCurrentWnd, &rCurWdrag);
if ((rDown.left == rCurWdrag.left) && (rDown.top == rCurWdrag.top))
Window_Drag = false;
TRACE("Window Drag - False\n");
else
Window_Drag = true;
TRACE("Window Drag - True\n");
return CallNextHookEx( hMouseHook, code, wParam, lParam) ;
case WM_LBUTTONUP:
TRACE("Up\n");
LButton_Down = false;
if ( Window_Drag && Mouse_Drag )
Window_Drag = false;
Mouse_Drag = false;
::SetWindowPos(hCurrentWnd, 0, 0, 0, 500, 500, SWP_ASYNCWINDOWPOS);
TRACE("Window Drag - False\n");
TRACE("Mouse Drag - False\n");
else
Window_Drag = false;
Mouse_Drag = false;
TRACE("Window Drag 1 - False\n");
TRACE("Mouse Drag 1 - False\n");
ReleaseCapture();
return CallNextHookEx(NULL, code, wParam, lParam);
default:
LButton_Down = false;
Window_Drag = false;
Mouse_Drag = false;
return CallNextHookEx(hMouseHook, code, wParam, lParam);
这是安装的全局鼠标钩子的一部分
BOOL CMFCApplication4Dlg::OnInitDialog()
CDialogEx::OnInitDialog();
// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon
// TODO: Add extra initialization here
LButton_Down = false;
Mouse_Drag = false;
Window_Drag = false;
hMouseHook = SetWindowsHookEx(WH_MOUSE_LL, (HOOKPROC)LowLevelMouseProc, NULL, (DWORD)NULL);
return TRUE; // return TRUE unless you set the focus to a control
我能做什么?
【问题讨论】:
如果您可以将问题减少到无法按预期工作的单个调用(或多行),它将帮助其他人帮助您。现在您的问题看起来像:“这是我的所有代码,但它不起作用”。 嗨,保罗,感谢您的友好回答。看来您有使用全局鼠标钩子的经验。你能帮帮我吗? 【参考方案1】:拖动窗口时,系统向窗口发送消息-WM_EXITSIZEMOVE。 释放鼠标左键后,我将 WM_EXITSIZEMOVE 消息发送到捕获鼠标左键事件的窗口。 完成此消息的过程后,我使用 SetWindowPos 方法重新定位窗口,效果很好。 就是这样。
【讨论】:
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