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/////////////////////////////////////////////////////////////////////////////
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// Name: src/osx/carbon/overlay.cpp
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// Purpose: common wxOverlay code
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// Author: Stefan Csomor
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// Copyright: (c) wxWidgets team
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// ============================================================================
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// ============================================================================
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// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#include "wx/overlay.h"
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#include "wx/dcclient.h"
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#include "wx/private/overlay.h"
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#ifdef wxHAS_NATIVE_OVERLAY
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// ============================================================================
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// ============================================================================
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wxOverlayImpl::wxOverlayImpl()
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m_overlayContext = NULL ;
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m_overlayWindow = NULL ;
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wxOverlayImpl::~wxOverlayImpl()
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bool wxOverlayImpl::IsOk()
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return m_overlayWindow != NULL ;
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void wxOverlayImpl::MacGetBounds( Rect *bounds )
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m_window->MacWindowToRootWindow( &x , &y ) ;
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wxNonOwnedWindow* tlw = m_window->MacGetTopLevelWindow();
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tlw->GetNonOwnedPeer()->WindowToScreen( &x, &y );
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bounds->bottom = y+m_y+m_height;
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bounds->right = x+m_x+m_width;
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OSStatus wxOverlayImpl::CreateOverlayWindow()
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WindowAttributes overlayAttributes = kWindowIgnoreClicksAttribute;
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m_overlayParentWindow =(WindowRef) m_window->MacGetTopLevelWindowRef();
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MacGetBounds(&bounds);
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err = CreateNewWindow( kOverlayWindowClass, overlayAttributes, &bounds, &m_overlayWindow );
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SetWindowGroup( m_overlayWindow, GetWindowGroup(m_overlayParentWindow)); // Put them in the same group so that their window layers are consistent
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m_overlayParentWindow = NULL ;
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cgbounds = CGDisplayBounds(CGMainDisplayID());
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bounds.top = (short)cgbounds.origin.y;
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bounds.left = (short)cgbounds.origin.x;
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bounds.bottom = (short)(bounds.top + cgbounds.size.height);
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bounds.right = (short)(bounds.left + cgbounds.size.width);
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err = CreateNewWindow( kOverlayWindowClass, overlayAttributes, &bounds, &m_overlayWindow );
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ShowWindow(m_overlayWindow);
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void wxOverlayImpl::Init( wxDC* dc, int x , int y , int width , int height )
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wxASSERT_MSG( !IsOk() , _("You cannot Init an overlay twice") );
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m_window = dc->GetWindow();
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if ( dc->IsKindOf( CLASSINFO( wxClientDC ) ))
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wxPoint origin = m_window->GetClientAreaOrigin();
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OSStatus err = CreateOverlayWindow();
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wxASSERT_MSG( err == noErr , _("Couldn't create the overlay window") );
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err = QDBeginCGContext(GetWindowPort(m_overlayWindow), &m_overlayContext);
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CGContextTranslateCTM( m_overlayContext, 0, m_height );
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CGContextScaleCTM( m_overlayContext, 1, -1 );
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CGContextTranslateCTM( m_overlayContext, -m_x , -m_y );
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wxASSERT_MSG( err == noErr , _("Couldn't init the context on the overlay window") );
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void wxOverlayImpl::BeginDrawing( wxDC* dc)
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wxDCImpl *impl = dc->GetImpl();
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wxGCDCImpl *win_impl = wxDynamicCast(impl,wxGCDCImpl);
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win_impl->SetGraphicsContext( wxGraphicsContext::CreateFromNative( m_overlayContext ) );
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dc->SetClippingRegion( m_x , m_y , m_width , m_height ) ;
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void wxOverlayImpl::EndDrawing( wxDC* dc)
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wxDCImpl *impl = dc->GetImpl();
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wxGCDCImpl *win_impl = wxDynamicCast(impl,wxGCDCImpl);
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win_impl->SetGraphicsContext(NULL);
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CGContextFlush( m_overlayContext );
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void wxOverlayImpl::Clear(wxDC* WXUNUSED(dc))
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wxASSERT_MSG( IsOk() , _("You cannot Clear an overlay that is not inited") );
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CGRect box = CGRectMake( m_x - 1, m_y - 1 , m_width + 2 , m_height + 2 );
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CGContextClearRect( m_overlayContext, box );
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void wxOverlayImpl::Reset()
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if ( m_overlayContext )
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OSStatus err = QDEndCGContext(GetWindowPort(m_overlayWindow), &m_overlayContext);
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wxFAIL_MSG("Couldn't end the context on the overlay window");
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m_overlayContext = NULL ;
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// todo : don't dispose, only hide and reposition on next run
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DisposeWindow(m_overlayWindow);
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m_overlayWindow = NULL ;
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#endif // wxHAS_NATIVE_OVERLAY