338 lines
9.3 KiB
C++
338 lines
9.3 KiB
C++
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/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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KeepWindowOnMonitor.cpp
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Abstract:
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Do not allow a window to be placed off the Monitor.
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History:
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04/24/2001 robkenny Created
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09/10/2001 robkenny Made shim more generic.
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(KeepWindowOnMonitor)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(SetWindowPos)
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APIHOOK_ENUM_ENTRY(MoveWindow)
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APIHOOK_ENUM_ENTRY(CreateWindowA)
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APIHOOK_ENUM_ENTRY(CreateWindowExA)
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APIHOOK_ENUM_END
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/*++
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Are these two RECTs equal
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--*/
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BOOL operator == (const RECT & rc1, const RECT & rc2)
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{
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return rc1.left == rc2.left &&
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rc1.right == rc2.right &&
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rc1.top == rc2.top &&
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rc1.bottom == rc2.bottom;
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}
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/*++
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Are these two RECTs different
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--*/
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BOOL operator != (const RECT & rc1, const RECT & rc2)
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{
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return ! (rc1 == rc2);
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}
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/*++
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Is rcWindow entirely visible on rcMonitor
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--*/
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BOOL EntirelyVisible(const RECT & rcWindow, const RECT & rcMonitor)
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{
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return rcWindow.left >= rcMonitor.left &&
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rcWindow.right <= rcMonitor.right &&
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rcWindow.top >= rcMonitor.top &&
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rcWindow.bottom <= rcMonitor.bottom;
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}
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#define MONITOR_CENTER 0x0001 // center rect to monitor
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#define MONITOR_CLIP 0x0000 // clip rect to monitor
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#define MONITOR_WORKAREA 0x0002 // use monitor work area
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#define MONITOR_AREA 0x0000 // use monitor entire area
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//
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// ClipOrCenterRectToMonitor
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//
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// The most common problem apps have when running on a
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// multimonitor system is that they "clip" or "pin" windows
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// based on the SM_CXSCREEN and SM_CYSCREEN system metrics.
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// Because of app compatibility reasons these system metrics
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// return the size of the primary monitor.
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//
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// This shows how you use the new Win32 multimonitor APIs
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// to do the same thing.
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//
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BOOL ClipOrCenterRectToMonitor(
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LPRECT prcWindowPos,
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UINT flags)
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{
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HMONITOR hMonitor;
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MONITORINFO mi;
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RECT rcMonitorRect;
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int w = prcWindowPos->right - prcWindowPos->left;
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int h = prcWindowPos->bottom - prcWindowPos->top;
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//
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// get the nearest monitor to the passed rect.
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//
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hMonitor = MonitorFromRect(prcWindowPos, MONITOR_DEFAULTTONEAREST);
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//
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// get the work area or entire monitor rect.
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//
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mi.cbSize = sizeof(mi);
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if ( !GetMonitorInfo(hMonitor, &mi) )
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{
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return FALSE;
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}
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if (flags & MONITOR_WORKAREA)
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rcMonitorRect = mi.rcWork;
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else
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rcMonitorRect = mi.rcMonitor;
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// We only want to move the window if it is not entirely visible.
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if (EntirelyVisible(*prcWindowPos, rcMonitorRect))
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{
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return FALSE;
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}
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//
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// center or clip the passed rect to the monitor rect
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//
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if (flags & MONITOR_CENTER)
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{
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prcWindowPos->left = rcMonitorRect.left + (rcMonitorRect.right - rcMonitorRect.left - w) / 2;
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prcWindowPos->top = rcMonitorRect.top + (rcMonitorRect.bottom - rcMonitorRect.top - h) / 2;
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prcWindowPos->right = prcWindowPos->left + w;
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prcWindowPos->bottom = prcWindowPos->top + h;
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}
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else
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{
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prcWindowPos->left = max(rcMonitorRect.left, min(rcMonitorRect.right-w, prcWindowPos->left));
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prcWindowPos->top = max(rcMonitorRect.top, min(rcMonitorRect.bottom-h, prcWindowPos->top));
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prcWindowPos->right = prcWindowPos->left + w;
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prcWindowPos->bottom = prcWindowPos->top + h;
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}
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return TRUE;
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}
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/*++
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If hwnd is not entirely visible on a single monitor,
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move/resize the window as necessary.
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--*/
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void ClipOrCenterWindowToMonitor(
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HWND hwnd,
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HWND hWndParent,
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UINT flags,
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const char * API)
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{
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// We only want to forcibly move top-level windows
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if (hWndParent == NULL || hWndParent == GetDesktopWindow())
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{
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// Grab the current position of the window
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RECT rcWindowPos;
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if ( GetWindowRect(hwnd, &rcWindowPos) )
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{
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RECT rcOrigWindowPos = rcWindowPos;
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// Calculate the new position of the window, based on flags
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if ( ClipOrCenterRectToMonitor(&rcWindowPos, flags) )
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{
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if (rcWindowPos != rcOrigWindowPos)
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{
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DPFN( eDbgLevelInfo, "[%s] HWnd(0x08x) OrigWindowRect (%d, %d) x (%d, %d) moved to (%d, %d) x (%d, %d)\n",
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API, hwnd,
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rcOrigWindowPos.left, rcOrigWindowPos.top, rcOrigWindowPos.right, rcOrigWindowPos.bottom,
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rcWindowPos.left, rcWindowPos.top, rcWindowPos.right, rcWindowPos.bottom);
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SetWindowPos(hwnd, NULL, rcWindowPos.left, rcWindowPos.top, 0, 0, SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
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}
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}
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}
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}
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}
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/*++
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Call SetWindowPos,
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but if the window is not entirely visible,
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the window will be centered on the nearest monitor.
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--*/
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BOOL
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APIHOOK(SetWindowPos)(
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HWND hWnd, // handle to window
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HWND hWndInsertAfter, // placement-order handle
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int X, // horizontal position
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int Y, // vertical position
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int cx, // width
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int cy, // height
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UINT uFlags // window-positioning options
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)
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{
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BOOL bReturn = ORIGINAL_API(SetWindowPos)(hWnd, hWndInsertAfter, X, Y, cx, cy, uFlags);
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ClipOrCenterWindowToMonitor(hWnd, GetParent(hWnd), MONITOR_CENTER | MONITOR_WORKAREA, "SetWindowPos");
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return bReturn;
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}
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/*++
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Call MoveWindow,
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but if the window is not entirely visible,
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the window will be centered on the nearest monitor.
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--*/
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BOOL
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APIHOOK(MoveWindow)(
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HWND hWnd, // handle to window
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int X, // horizontal position
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int Y, // vertical position
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int nWidth, // width
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int nHeight, // height
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BOOL bRepaint // repaint option
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)
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{
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BOOL bReturn = ORIGINAL_API(MoveWindow)(hWnd, X, Y, nWidth, nHeight, bRepaint);
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ClipOrCenterWindowToMonitor(hWnd, GetParent(hWnd), MONITOR_CENTER | MONITOR_WORKAREA, "MoveWindow");
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return bReturn;
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}
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/*++
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Call CreateWindowA,
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but if the window is not entirely visible,
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the window will be centered on the nearest monitor.
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--*/
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HWND
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APIHOOK(CreateWindowA)(
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LPCSTR lpClassName, // registered class name
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LPCSTR lpWindowName, // window name
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DWORD dwStyle, // window style
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int x, // horizontal position of window
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int y, // vertical position of window
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int nWidth, // window width
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int nHeight, // window height
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HWND hWndParent, // handle to parent or owner window
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HMENU hMenu, // menu handle or child identifier
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HINSTANCE hInstance, // handle to application instance
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LPVOID lpParam // window-creation data
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)
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{
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HWND hWnd = ORIGINAL_API(CreateWindowA)(lpClassName,
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lpWindowName,
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dwStyle,
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x,
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y,
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nWidth,
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nHeight,
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hWndParent,
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hMenu,
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hInstance,
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lpParam);
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if (hWnd)
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{
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ClipOrCenterWindowToMonitor(hWnd, hWndParent, MONITOR_CENTER | MONITOR_WORKAREA, "CreateWindowA");
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}
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return hWnd;
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}
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/*++
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Call CreateWindowExA,
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but if the window is not entirely visible,
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the window will be centered on the nearest monitor.
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--*/
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HWND
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APIHOOK(CreateWindowExA)(
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DWORD dwExStyle, // extended window style
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LPCSTR lpClassName, // registered class name
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LPCSTR lpWindowName, // window name
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DWORD dwStyle, // window style
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int x, // horizontal position of window
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int y, // vertical position of window
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int nWidth, // window width
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int nHeight, // window height
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HWND hWndParent, // handle to parent or owner window
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HMENU hMenu, // menu handle or child identifier
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HINSTANCE hInstance, // handle to application instance
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LPVOID lpParam // window-creation data
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)
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{
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HWND hWnd = ORIGINAL_API(CreateWindowExA)(dwExStyle,
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lpClassName,
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lpWindowName,
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dwStyle,
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x,
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y,
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nWidth,
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nHeight,
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hWndParent,
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hMenu,
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hInstance,
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lpParam);
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if (hWnd)
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{
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ClipOrCenterWindowToMonitor(hWnd, hWndParent, MONITOR_CENTER | MONITOR_WORKAREA, "CreateWindowExA");
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}
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return hWnd;
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}
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/*++
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Register hooked functions
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--*/
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HOOK_BEGIN
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APIHOOK_ENTRY(USER32.DLL, SetWindowPos)
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APIHOOK_ENTRY(USER32.DLL, MoveWindow)
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APIHOOK_ENTRY(USER32.DLL, CreateWindowA)
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APIHOOK_ENTRY(USER32.DLL, CreateWindowExA)
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HOOK_END
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IMPLEMENT_SHIM_END
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