C++ ClipCursor函数代码示例

void OverlayControl::MouseDown(HWND hwnd, WPARAM wParam, LPARAM lParam)
{
	if (!ActiveOverlay)
		return;

	//	Left or right button clicked -- select the element under cursor.
	RECT clipRect, clientRect;
	GetWindowRect(hwnd, &clipRect);
	GetClientRect(hwnd, &clientRect);

	//	Save original mouse position.
	GetCursorPosition(hwnd, &clickAnchor);

	//	Element could be activated only if no element active AND user doesn't click 
	//	within the active element.
	if (!ActiveOverlay->ActiveElement || 
		!ActiveOverlay->HitTestElement(ActiveOverlay->ActiveElement, &clientRect, &clickAnchor, &hitTestAnchor))
	{
		//	Find overlay element under cursor.
		OverlayElement *element = ActiveOverlay->FindElementFromPoint(&clientRect, &clickAnchor, &hitTestAnchor);
		ActivateElement(hwnd, element);
	}

	if (!ActiveOverlay->ActiveElement)
	{
		ResetCursor();
	}

	if (0 != (wParam & MK_LBUTTON))
	{
		if (ActiveOverlay->ActiveElement)
		{
			ActiveOverlay->ActiveElement->GetRect(&clientRect, &elementRectAnchor);

			//	Show that we're about to drag the object.
			UpdateCursor(hitTestAnchor);

			//	Capture the mouse.
			SetCapture(hwnd);
			ClipCursor(&clipRect);
		}

		return;
	}

	if (0 != (wParam & MK_RBUTTON))
	{
		//	Show popup menu.
		POINT pt;
		GetCursorPos(&pt);

		__raise RightMouseButtonClicked(ActiveOverlay->ActiveElement, &pt);

		return;
	}
}

void CRemoteWnd::TrackScaler()
{
	MSG* pMsg = &AfxGetThreadState()->m_msgCur;
	CRect rcTrack( &m_rcsScalerTrack );
	CPoint point;

	ClientToScreen( &rcTrack );
	ClipCursor( &rcTrack );
	ScreenToClient( &rcTrack );
	SetCapture();

	rcTrack.DeflateRect( m_rcScalerTab.Width() / 2, 0 );

	while ( GetAsyncKeyState( VK_LBUTTON ) & 0x8000 )
	{
		while ( ::PeekMessage( pMsg, NULL, WM_MOUSEFIRST, WM_MOUSELAST, PM_REMOVE ) );

		if ( ! AfxGetThread()->PumpMessage() )
		{
			AfxPostQuitMessage( 0 );
			break;
		}

		GetCursorPos( &point );
		ScreenToClient( &point );

		int nPosition = (int)( 105.0f * (float)( point.x - rcTrack.left ) / (float)rcTrack.Width() );
		if ( nPosition < 0 ) nPosition = 0;
		else if ( nPosition >= 102 ) nPosition = 101;
		else if ( nPosition >= 100 ) nPosition = 100;

		// ToDo: Settings.Live.BandwidthScaleOut
		if ( nPosition != (int)Settings.Live.BandwidthScaleIn )
		{
			Settings.Live.BandwidthScaleIn = (DWORD)nPosition;
			Invalidate();
		}
	}

	ReleaseCapture();
	ClipCursor( NULL );
	Invalidate();
}

void	Window::LockMouseToWindow(bool lock)	{
	lockMouse = lock;
	if(lock) {
		RECT		windowRect;
		GetWindowRect (window->windowHandle, &windowRect);

		SetCapture(window->windowHandle);
		ClipCursor(&windowRect);

		POINT pt;
		GetCursorPos(&pt);
		ScreenToClient(window->windowHandle, &pt);
		Window::GetMouse()->SetAbsolutePosition(pt.x,pt.y);
	}
	else{
		ReleaseCapture();
		ClipCursor(NULL);
	}
}

BOOL WINAPI _ClipCursor(const RECT *lpRect)
{
  if ( !wmode )
  {
    if ( _ClipCursorOld )
      return _ClipCursorOld(lpRect);
    return ClipCursor(lpRect);
  }
  return TRUE;
}

void OverlayControl::MouseUp(HWND hwnd, WPARAM wParam, LPARAM lParam)
{
	if (!ActiveOverlay)
		return;

	//	Release mouse.
	ClipCursor(0);
	ReleaseCapture();
	ResetCursor();
}

void MouseSetRect(int x1, int y1, int x2, int y2)
{
	#if 0
	TRect r;
	
	r.x1 = x1, r.y1 = y1, r.x2 = x2, r.y2 = y2;
	ClipCursor(&r); /// FIXME -- SDL cannot clip mouse cursor, do it ourselves!
SDL_WM_GrabInput(SDL_GRAB_ON);
	#endif
}

// ----------------------------------------------------------------------- //
//
//	ROUTINE:	CLTWnd::OnLButtonUp
//
//	PURPOSE:	This is the actual left button up handler
//
// ----------------------------------------------------------------------- //
BOOL CLTWnd::OnLButtonUp(int xPos, int yPos)
{
	// Stop any draggage
	//if(s_pWndDrag)
	g_mouseMgr.SetClipRect(NULL);
	ClipCursor(g_prcClip);
	//s_pWndDrag = NULL;
	s_pWndCapture = NULL;
	return(this != s_pMainWnd);
}

void WindowsMouseController::grab()
{
    RECT clipRegion;
    GetWindowRect( mWindowHandle, &clipRegion );
    clipRegion.left += 10;
    clipRegion.right -= 10;
    clipRegion.top += 33;
    clipRegion.bottom -= 10;
    ClipCursor( &clipRegion );
}

void Window::lockMouse()
{
	RECT clientRect;
	GetClientRect(m_hWnd,&clientRect);
	POINT p1 = {clientRect.left,clientRect.top};
	POINT p2 = {clientRect.right,clientRect.bottom};
	ClientToScreen(m_hWnd,&p1); ClientToScreen(m_hWnd,&p2);
	RECT bounds={p1.x,p1.y,p2.x,p2.y};
	ClipCursor(&bounds);
}

/*
   Effect:        Handle any actions relating to the user pressing *down*
                  the left mouse button within the widget.

                  In particular, we need to prepare the widget for moving
                  || sizing. To do this, we remove any drag blobs already
                  present on the widget.

                  We also capture the mouse input, so we can track the
                  movement of the mouse. We will release the capture
                  when the user releases the mouse key.

                  Since the window class style of the widget might not
                  accept double clicks, we will need to compute double
                  clicks ourselves.

                  If someone else has control of the mouse (like the
                  session window || another widget), we won't be getting
                  this mouse message.

   See Also:      WidgetLButtonUp, WidgetLMouseMove.

   Called By:     WidgetWndProc, in response to WM_LBUTTONDOWN messages.
                  LayoutWndProc, in response to WM_LBUTTONDOWN messages
                  when the mouse is over a drag blob.
*/
void WidgetLButtonDown(HWND hWnd, int nDragMode, POINT ptScreen)
{
    RECT rcParentScreen;
    HWND hWndParent, hWndPrev;
    HDC hDC;

    CurrentWidgetInfo.ptPrev = ptScreen;

    hWndParent = GetParent(hWnd);
    CurrentWidgetInfo.nDragMode = nDragMode;
    hDC = GetDC(hWndParent);

    /* Erase the drag blobs from the current widget. The blobs will */
    /* be repainted in WidgetButtonUp after the user finishes dragging */
    /* || sizing. */

    GetWindowRect(hWnd, &CurrentWidgetInfo.rcPrevDots);
    GetWindowRect(hWnd, &CurrentWidgetInfo.rcPrev);

    hWndPrev = CurrentWidgetInfo.hWnd;
    CurrentWidgetInfo.bDotsDrawn = FALSE;

    CurrentWidgetInfo.bDotsDrawn = TRUE;

    if (hWnd != CurrentWidgetInfo.hWnd)
    {
        if (KpsSetCurrentWidget(hWnd))
        {
            if (IsWindow(hWndPrev))
            {
                if (KpsIsAWidget(hWndPrev))
                {
                    InvalidateRect(hWndPrev, NULL, TRUE);
                    UpdateWindow(hWndPrev);
                }
            }
        }
        InvalidateRect(hWnd, NULL, TRUE);
        UpdateWindow(hWnd);
    }

    if (!CurrentWidgetInfo.bCapture)
    {
        SetCapture(hWnd);
        GetClientRect(hWndParent, &rcParentScreen);
        KpsClientRectToScreen(hWndParent, &rcParentScreen);
        ClipCursor(&rcParentScreen);
        CurrentWidgetInfo.bCapture = TRUE;
    }

    ReleaseDC(hWndParent, hDC);

    /* Clear out the rectangle, indicating there is nothing to erase! */
    SetRectEmpty(&rcPrev);
}

/*
================
IN_DeactivateWin32Mouse
================
*/
void IN_DeactivateWin32Mouse(void)
{
	// NERVE - SMF - dont do this in developer mode
	if(!com_developer->integer)
	{
		ClipCursor(NULL);
	}
	ReleaseCapture();
	while(ShowCursor(TRUE) < 0)
		;
}

void PixelLightCtrl::SetTrapMouse(bool bTrap)
{
	if (m_hFrontendWnd) {
		// Trap mouse?
		if (bTrap) {
			// Get window rect (in screen coordinates)
			RECT sRect;
			GetWindowRect(&sRect);

			// Trap mouse
			ClipCursor(&sRect); 
		} else {
			// Untrap mouse
			ClipCursor(nullptr);
		}

		// Backup the state
		m_bTrapMouse = bTrap;
	}
}

// Called when the window loses focus
static void Win_DeAcquireMouse( void ) {
    if( win.mouse.restoreparms )
        SystemParametersInfo( SPI_SETMOUSE, 0, win.mouse.originalparms, 0 );

    SetCursorPos( win.center_x, win.center_y );

    ClipCursor( NULL );
    ReleaseCapture();

    SetWindowText( win.wnd, PRODUCT );
}

void
WIN_UpdateClipCursor(SDL_Window *window)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    SDL_Mouse *mouse = SDL_GetMouse();

    /* Don't clip the cursor while we're in the modal resize or move loop */
    if (data->in_title_click || data->in_modal_loop) {
        ClipCursor(NULL);
        return;
    }

    if ((mouse->relative_mode || (window->flags & SDL_WINDOW_INPUT_GRABBED)) &&
        (window->flags & SDL_WINDOW_INPUT_FOCUS)) {
        if (mouse->relative_mode && !mouse->relative_mode_warp) {
            LONG cx, cy;
            RECT rect;
            GetWindowRect(data->hwnd, &rect);

            cx = (rect.left + rect.right) / 2;
            cy = (rect.top + rect.bottom) / 2;

            /* Make an absurdly small clip rect */
            rect.left = cx - 1;
            rect.right = cx + 1;
            rect.top = cy - 1;
            rect.bottom = cy + 1;

            ClipCursor(&rect);
        } else {
            RECT rect;
            if (GetClientRect(data->hwnd, &rect) && !IsRectEmpty(&rect)) {
                ClientToScreen(data->hwnd, (LPPOINT) & rect);
                ClientToScreen(data->hwnd, (LPPOINT) & rect + 1);
                ClipCursor(&rect);
            }
        }
    } else {
        ClipCursor(NULL);
    }
}

// Hide the mouse cursor
//
static void hideCursor(_GLFWwindow* window)
{
    POINT pos;

    ClipCursor(NULL);

    if (GetCursorPos(&pos))
    {
        if (WindowFromPoint(pos) == window->win32.handle)
            SetCursor(NULL);
    }
}