自学教程：C++ GetCapture函数代码示例

void CMDIView::OnLButtonUp(UINT nFlags, CPoint point){  if(this == GetCapture())    ReleaseCapture();                                                  // Stop capturing mouse messages  // Make sure there is an element  if(m_pTempElement)  { // Add the element pointer to the sketch        GetDocument()->AddElement(m_pTempElement);     InvalidateRect(&m_pTempElement->GetEnclosingRect());    m_pTempElement.reset();                                            // Reset the element pointer   }}

intInternalDialog(HWND hDlg){    HWND    hWnd,hWndFocus,hWndCapture;    int     rc = 0;    MSG     msg;    if(hDlg == 0)        return 0;    hWnd = GetWindowWord(hDlg,DWW_PARENT);    if ((hWndCapture = GetCapture()))        ReleaseCapture();    while (IsWindow(hDlg) && (GetWindowWord(hDlg,DWW_STATUS) == 0)) {        if(GetMessage(&msg, (HWND)0, 0, 0)) {            if (msg.message == WM_CLOSE) {                DispatchMessage (&msg) ;                break;            }            if(IsDialogMessage(hDlg,&msg))                continue;            TranslateMessage (&msg) ;            DispatchMessage (&msg) ;        }        if (hWnd) {	/* if there is an owner */            if (!PeekMessage(&msg,hDlg,0,0,PM_NOREMOVE))                SendMessage(hWnd,WM_ENTERIDLE,MSGF_DIALOGBOX,(LPARAM)hDlg);        }    }    if (IsWindow(hDlg)) {        rc = GetWindowWord(hDlg,DWW_RESULT);        DestroyWindow(hDlg);    }    if(hWnd && IsWindow(hWnd)) {        EnableWindow(hWnd, TRUE);        if ((hWndFocus = GetDialogFocus(hWnd)))            SetFocus(hWndFocus);    }    if (hWndCapture)        SetCapture(hWndCapture);    return rc;}

void CDiasStatusBar::OnRButtonUp (UINT nFlags, CPoint point) {	if (GetCapture() != this) {		ReleaseCapture ();		return;	}	ReleaseCapture ();	CRect rect1, rect2;	GetItemRect (2, rect1);	GetItemRect (3, rect2);	uvar32_64 n, count = 0;	CaImMenu menu;	CaImMenuItem** ppItems;	menu.CreatePopupMenu ();	GetItemRect (2, rect1);	GetItemRect (3, rect2);	if (rect1.PtInRect (point) || rect2.PtInRect (point)) {		count = theApp.GeomScales.GetCount ();		ppItems = new CaImMenuItem*[count];		for (n = 0; n < count; ++n) {			ppItems[n] = new CaImMenuItem (theApp.GeomScales[n].GetName() + "/t(" + theApp.GeomScales[n].GetUnits () + ")",				(theApp.GeomScales[aimActive].GetPos () == n) ? AMIS_CHECKED : 0);			menu.AppendMenu (MF_STRING | MF_ENABLED | MF_OWNERDRAW, ID_TOOLS_GEOMSCALE_1 + n, (LPCTSTR)ppItems[n]);		}		menu.CheckMenuRadioItem (0, n, theApp.GeomScales[aimActive].GetPos (), MF_BYPOSITION);	}	GetItemRect (4, rect1);	GetItemRect (5, rect2);	if (rect1.PtInRect (point) || rect2.PtInRect (point)) {		count = theApp.DensScales.GetCount ();		ppItems = new CaImMenuItem*[count];		for (n = 0; n < count; ++n) {			ppItems[n] = new CaImMenuItem (theApp.DensScales[n].GetName() + "/t(" + theApp.DensScales[n].GetUnits () + ")",				(theApp.DensScales[aimActive].GetPos () == n) ? AMIS_CHECKED : 0);			menu.AppendMenu (MF_STRING | MF_ENABLED | MF_OWNERDRAW, ID_TOOLS_GEOMSCALE_1 + n, (LPCTSTR)ppItems[n]);		}		menu.CheckMenuRadioItem (0, n, theApp.DensScales[aimActive].GetPos (), MF_BYPOSITION);	}	GetWindowRect (rect2);	menu.TrackPopupMenu (TPM_LEFTALIGN, point.x + rect2.left, point.y + rect2.top, this);	for (n = 0; n < count; ++n)		delete ppItems[n];	if (count > 0)		delete [] ppItems;}

void SButton::OnStateChanged( DWORD dwOldState,DWORD dwNewState ){    StopCurAnimate();    if(GetCapture()==m_swnd)    //点击中        return;    if(m_bAnimate &&        ((dwOldState==WndState_Normal && dwNewState==WndState_Hover)        ||(dwOldState==WndState_Hover && dwNewState==WndState_Normal)))    {//启动动画        m_byAlphaAni=5;        GetContainer()->RegisterTimelineHandler(this);    }}

// 鼠标左键按下void ProgressController::left_button_down(){	// 查询当前光标位置，判断光标是在滑道还是滑块上	POINT p;	GetCursorPos(&p);	HWND hwnd = GetCapture();	ScreenToClient(hwnd, &p);	if (p.x >= m_left && p.x <= m_left + m_width)	{		// 如果光标在滑道上		POINT point;		GetCursorPos(&point); // 查询光标位置	}}

void CRoundButton2::OnCaptureChanged(CWnd *pWnd){	// Check, if we lost the mouse-capture	if (GetCapture() != this)	{		// We have lost the mouse-capture, so the mouse has left the buttons face		m_bMouseOnButton = false;		// Redraw Control, if Button is hot		if (m_bIsHotButton)			Invalidate();	}	CButton::OnCaptureChanged(pWnd);}

void CAutoRepeatButton::OnLButtonUp(UINT nFlags, CPoint point) {    KillTimer(IDT_TIMER);		if(GetCapture() != NULL)	{ /* release capture */		ReleaseCapture();	if(sent == 0 && (GetState() & BST_PUSHED) != 0)	   GetParent()->SendMessage(WM_COMMAND, MAKELONG(GetDlgCtrlID(), BN_CLICKED), (LPARAM)m_hWnd);	} /* release capture */       	           //CButton::OnLButtonUp(nFlags, point);}

// on mouse movevoid CSplitterFrame::OnMouseMove(UINT nFlags, CPoint point){    if(GetCapture()==this) {        CPoint ptCursor;        GetCursorPos(&ptCursor);        CPoint pt = GetAbsPosition();        if(sp_uiDockSide==AFX_IDW_DOCKBAR_LEFT || sp_uiDockSide==AFX_IDW_DOCKBAR_RIGHT) {            pt.x = ptCursor.x;        } else if(sp_uiDockSide==AFX_IDW_DOCKBAR_TOP || sp_uiDockSide==AFX_IDW_DOCKBAR_BOTTOM) {            pt.y = ptCursor.y;        }        SetAbsPosition(pt);    }    CWnd::OnMouseMove(nFlags, point);}

void CSketcherView::OnLButtonUp(UINT nFlags, CPoint point){   if(this == GetCapture())      ReleaseCapture();        // Stop capturing mouse messages   // Make sure there is an element   if(m_pTempElement)   {      // Call a document class function to store the element      // pointed to by m_pTempElement in the document object      delete m_pTempElement;           // This code is temporary      m_pTempElement = 0;              // Reset the element pointer   }}

LTBOOL	CFolderJoin::OnLButtonUp(int x, int y){	if (bDblClick)	{		bDblClick = LTFALSE;		return LTFALSE;	}	if (GetCapture())	{		return m_pPassEdit->OnEnter();	}	return CBaseFolder::OnLButtonUp(x,y);}

BOOL CExtButton::PreTranslateMessage(MSG* pMsg) {	if( !CExtPopupMenuWnd::IsMenuTracking() )	{		InitToolTip();		m_ToolTip.RelayEvent(pMsg);	}//	if( CExtPopupMenuWnd::IsMenuTracking() )//		return TRUE;	if(		(	pMsg->message == WM_KEYDOWN				|| pMsg->message == WM_KEYUP			)		&&			(	pMsg->wParam == VK_RETURN				|| pMsg->wParam == VK_SPACE			)		)	{		if( IsWindowEnabled() && IsWindowVisible() && (!m_bPushTracking) )		{			if(	(pMsg->message == WM_KEYDOWN && pMsg->wParam == VK_RETURN)				||				(pMsg->message == WM_KEYUP && pMsg->wParam == VK_SPACE)				)			{				if( GetCapture() == this )					ReleaseCapture();				m_bMouseOver = m_bPushed = m_bPushTracking = m_bKeyTracking = FALSE;				Invalidate();				UpdateWindow();				_OnClick();				return TRUE;			}			if(pMsg->message == WM_KEYDOWN && pMsg->wParam == VK_SPACE)			{				m_bMouseOver = m_bPushed = m_bKeyTracking = TRUE;				SetCapture();				Invalidate();				UpdateWindow();				return TRUE;			}		} // if( IsWindowEnabled() && IsWindowVisible() && (!m_bPushTracking) )		return TRUE;	}	return CButton::PreTranslateMessage(pMsg);}

//////////////////// Change state for finite-state-machine.//void CDragDropMgr::SetState(UINT iState){//	TRACE(_T("CDragDropMgr::SetState %d/n"),iState);		if (iState != m_iState)     {		switch (iState)		{		case CAPTURED:			::SetCapture(m_hwndTracking);	 // capture mouse input			break;			        case LDRAGGING:        case RDRAGGING:			m_hCursorSave = GetCursor();	 // save current cursor			break;					default: // NONE			if (GetCapture() == m_hwndTracking)				::ReleaseCapture();				 // release capture and..						SetCursor(m_hCursorSave);		 // ..restore cursor			            if (m_pDragImage)             {				m_pDragImage->DragLeave(CWnd::FromHandle(m_ddi.hwndTarget));				m_pDragImage->EndDrag();	 // end drawing and..								delete m_pDragImage;			 // ..destroy..				m_pDragImage=NULL;			 // ..image list			}			if (m_hwndTracking)				InvalidateRect(m_hwndTracking, NULL, FALSE);			if (m_ddi.hwndTarget)				InvalidateRect(m_ddi.hwndTarget, NULL, FALSE);			delete m_ddi.pData;			m_ddi.pData = NULL;			m_hwndTracking = NULL;						break;		}				m_iState = iState;	}}

voidZListTip::OnMouseMove( UINT uFlags, CPoint pt ){#ifdef DEBUG_ALL   TraceRect( "ZListTip::OnMouseMove rectTitle: ", m_rectTitle );   TracePoint( "ZListTip::OnMouseMove pt: ", pt );#endif   if ( m_rectTitle.PtInRect( pt ) == FALSE )   {#ifdef DEBUG_ALL   TracePoint( "ZListTip::OnMouseMove PtInRect: ", pt );#endif#if 0      if ( GetCapture( ) == this )         ReleaseCapture( );      SetWindowPos( 0, 0, 0, 0, 0,                    SWP_HIDEWINDOW | SWP_NOMOVE | SWP_NOSIZE |                      SWP_NOZORDER | SWP_NOACTIVATE );#else      Hide( );#endif      // Forward the message      ClientToScreen( &pt );      CWnd *pWnd = WindowFromPoint( pt );      if ( pWnd == this )         pWnd = m_pParentWnd;      CWnd *pWndTemp = GetFocus( );      if ( pWndTemp != pWnd )         pWnd->SetFocus( );      zLONG lParam = MAKELONG( pt.x, pt.y );      int nHitTest = (int) pWnd->SendMessage( WM_NCHITTEST, 0, lParam );      if ( nHitTest == HTCLIENT )      {         pWnd->ScreenToClient( &pt );         lParam = MAKELONG( pt.x, pt.y );         pWnd->PostMessage( WM_MOUSEMOVE, uFlags, lParam );      }      else      {         pWnd->PostMessage( WM_NCMOUSEMOVE, nHitTest, lParam );      }   }}

bool track_bar::on_hooked_message(message_hook_manager::t_message_hook_type p_type, int code, WPARAM wp, LPARAM lp){    win32_keyboard_lparam & lpkeyb = get_keyboard_lparam(lp);    if (wp == VK_ESCAPE && !lpkeyb.transition_code && !lpkeyb.previous_key_state)    {        destroy_tooltip();        if (GetCapture() == get_wnd())            ReleaseCapture();        m_dragging = false;        set_position_internal(m_position);        message_hook_manager::deregister_hook(message_hook_manager::type_keyboard, this);        m_hook_registered=false;        return true;    }    return false;}

void CFlatToolbar::OnCancelMode(){	CControlBar::OnCancelMode();	if (m_iButtonCapture >= 0)	{		AFX_TBBUTTON* pTBB = _GetButtonPtr(m_iButtonCapture);		ASSERT(!(pTBB->nStyle & TBBS_SEPARATOR));		UINT nNewStyle = (pTBB->nStyle & ~TBBS_PRESSED);		if (GetCapture() == this)			ReleaseCapture();		SetButtonStyle(m_iButtonCapture, nNewStyle);		m_iButtonCapture = -1;		UpdateWindow();	}}

void WLTreeItemAL::OnLButtonDown(UINT /*nFlags*/, CPoint point) {	SetFocus() ;	m_bLButtonDown = TRUE ;	HostToClient(&point) ;	if (SendMessage(WM_CAN_YOU_DRAG, 0, 0))	{		if (GetCapture() != this)			SetCapture() ;		m_bPrepareDrag = TRUE ;		m_dwPrepareDragTime = GetTickCount() ;		m_ptPrepareDragPoint = point ;	}}

//---------------------------------------------------------------------------------------void z_ed3View::OnRButtonDown(UINT nFlags, CPoint point) {    GetCursorPos(&_scrPoint);    if(GetCapture()!= this)	    SetCapture();	GetCursorPos(&_scrPoint);    HideTheCursor();    	_mm._rdown = 1;    _rotating  = _mm._ldown;    _mm._pt    = point;    _mm._ptd   = point;	    CView::OnRButtonDown(nFlags, point);}

void CFolderSave::Escape(){	if (GetCapture())	{        m_pEdit->Select(LTFALSE);		g_pColCtrl->SetString(0, g_hOldName);		g_pColCtrl->SetString(2, g_hOldTime);		SetCapture(LTNULL);		RemoveFixedControl(m_pEdit);	}	else	{		CBaseFolder::Escape();	}}

void CFolderJoin::Escape(){	if (m_pPassEdit && GetCapture() == m_pPassEdit)	{        SetCapture(LTNULL);		m_szPassword[0] = LTNULL;		RemoveFixedControl(m_pPassEdit);		RemoveFixedControl(m_pPassLabel);		RemoveFixedControl(m_pPassBack);		m_bAskingForPassword = FALSE;		ForceMouseUpdate();	}	else		CBaseFolder::Escape();}

BOOL COptionTreeImagePopUp::PreTranslateMessage(MSG* pMsg) {	// Relay tooltip	if (IsWindow(m_ttToolTip.GetSafeHwnd()))	{		m_ttToolTip.RelayEvent(pMsg);	}    // Sometimes if the picker loses focus it is never destroyed    if (GetCapture()->GetSafeHwnd() != GetSafeHwnd())    {   		SetCapture(); 	}		return CWnd::PreTranslateMessage(pMsg);}

/*********************************************************************** *           ScrollTrackScrollBar * * Track a mouse button press on a scroll-bar. * pt is in screen-coordinates for non-client scroll bars. */VOID FASTCALLScrollTrackScrollBar(HWND Wnd, INT SBType, POINT Pt){  MSG Msg;  UINT XOffset = 0, YOffset = 0;  if (SBType != SB_CTL)  { // Used with CMD mouse tracking.      PWND pwnd = ValidateHwnd(Wnd);      if (!pwnd) return;      XOffset = pwnd->rcClient.left - pwnd->rcWindow.left;      YOffset = pwnd->rcClient.top - pwnd->rcWindow.top;//      RECT rect;//      WIN_GetRectangles( Wnd, COORDS_CLIENT, &rect, NULL );      ScreenToClient(Wnd, &Pt);//      Pt.x -= rect.left;//      Pt.y -= rect.top;      Pt.x += XOffset;      Pt.y += YOffset;  }  IntScrollHandleScrollEvent(Wnd, SBType, WM_LBUTTONDOWN, Pt);  do  {      if (!GetMessageW(&Msg, 0, 0, 0)) break;      if (CallMsgFilterW(&Msg, MSGF_SCROLLBAR)) continue;      if ( Msg.message == WM_LBUTTONUP ||           Msg.message == WM_MOUSEMOVE ||          (Msg.message == WM_SYSTIMER && Msg.wParam == SCROLL_TIMER))      {          Pt.x = LOWORD(Msg.lParam) + XOffset;          Pt.y = HIWORD(Msg.lParam) + YOffset;          IntScrollHandleScrollEvent(Wnd, SBType, Msg.message, Pt);      }      else      {          TranslateMessage(&Msg);          DispatchMessageW(&Msg);      }      if (!IsWindow(Wnd))      {          ReleaseCapture();          break;      }   } while (Msg.message != WM_LBUTTONUP && GetCapture() == Wnd);}

// ---------------------------------------------------------------------LRESULT WinSkinWindow::onDestroy(	HWND hWnd,		// ウィンドウハンドル	UINT uMsg,		// WM_DESTROY	WPARAM wParam,	// 利用しないパラメ
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