///////////////////////////////////////////////////////////////////////////////
-// Name: notebook.cpp
+// Name: src/mac/carbon/notebmac.cpp
// Purpose: implementation of wxNotebook
// Author: Stefan Csomor
// Modified by:
// Created: 1998-01-01
// RCS-ID: $Id$
// Copyright: (c) Stefan Csomor
-// Licence: wxWidgets licence
+// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
-#ifdef __GNUG__
-#pragma implementation "notebook.h"
-#endif
+#include "wx/wxprec.h"
-// ============================================================================
-// declarations
-// ============================================================================
+#if wxUSE_NOTEBOOK
+
+#include "wx/notebook.h"
+
+#ifndef WX_PRECOMP
+ #include "wx/string.h"
+ #include "wx/log.h"
+ #include "wx/app.h"
+ #include "wx/image.h"
+#endif
-// ----------------------------------------------------------------------------
-// headers
-// ----------------------------------------------------------------------------
-#include "wx/app.h"
#include "wx/string.h"
-#include "wx/log.h"
#include "wx/imaglist.h"
-#include "wx/image.h"
-#include "wx/notebook.h"
#include "wx/mac/uma.h"
-// ----------------------------------------------------------------------------
-// macros
-// ----------------------------------------------------------------------------
+
// check that the page index is valid
#define IS_VALID_PAGE(nPage) ((nPage) < GetPageCount())
-// ----------------------------------------------------------------------------
-// event table
-// ----------------------------------------------------------------------------
-
DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED)
DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGING)
BEGIN_EVENT_TABLE(wxNotebook, wxControl)
- EVT_NOTEBOOK_PAGE_CHANGED(-1, wxNotebook::OnSelChange)
+ EVT_NOTEBOOK_PAGE_CHANGED(wxID_ANY, wxNotebook::OnSelChange)
EVT_SIZE(wxNotebook::OnSize)
EVT_SET_FOCUS(wxNotebook::OnSetFocus)
IMPLEMENT_DYNAMIC_CLASS(wxNotebook, wxControl)
IMPLEMENT_DYNAMIC_CLASS(wxNotebookEvent, wxCommandEvent)
-// ============================================================================
-// implementation
-// ============================================================================
-
-// ----------------------------------------------------------------------------
-// wxNotebook construction
-// ----------------------------------------------------------------------------
// common part of all ctors
void wxNotebook::Init()
}
// the same arguments as for wxControl
-wxNotebook::wxNotebook(wxWindow *parent,
- wxWindowID id,
- const wxPoint& pos,
- const wxSize& size,
- long style,
- const wxString& name)
+wxNotebook::wxNotebook( wxWindow *parent,
+ wxWindowID id,
+ const wxPoint& pos,
+ const wxSize& size,
+ long style,
+ const wxString& name )
{
Init();
- Create(parent, id, pos, size, style, name);
+ Create( parent, id, pos, size, style, name );
}
-// Create() function
-bool wxNotebook::Create(wxWindow *parent,
- wxWindowID id,
- const wxPoint& pos,
- const wxSize& size,
- long style,
- const wxString& name)
+bool wxNotebook::Create( wxWindow *parent,
+ wxWindowID id,
+ const wxPoint& pos,
+ const wxSize& size,
+ long style,
+ const wxString& name )
{
- m_macIsUserPane = FALSE ;
-
- if ( !wxNotebookBase::Create(parent, id, pos, size, style, name) )
+ m_macIsUserPane = false ;
+
+ if (! (style & wxBK_ALIGN_MASK))
+ style |= wxBK_TOP;
+
+ if ( !wxNotebookBase::Create( parent, id, pos, size, style, name ) )
return false;
- Rect bounds = wxMacGetBoundsForControl( this , pos , size ) ;
+ Rect bounds = wxMacGetBoundsForControl( this, pos, size );
- if( bounds.right <= bounds.left )
- bounds.right = bounds.left + 100 ;
+ if ( bounds.right <= bounds.left )
+ bounds.right = bounds.left + 100;
if ( bounds.bottom <= bounds.top )
- bounds.bottom = bounds.top + 100 ;
-
- UInt16 tabstyle = kControlTabDirectionNorth ;
- if ( HasFlag(wxNB_LEFT) )
- tabstyle = kControlTabDirectionWest ;
- else if ( HasFlag( wxNB_RIGHT ) )
- tabstyle = kControlTabDirectionEast ;
- else if ( HasFlag( wxNB_BOTTOM ) )
- tabstyle = kControlTabDirectionSouth ;
-
- ControlTabSize tabsize = kControlTabSizeLarge ;
- if ( GetWindowVariant() == wxWINDOW_VARIANT_SMALL )
- tabsize = kControlTabSizeSmall ;
- else if ( GetWindowVariant() == wxWINDOW_VARIANT_MINI )
+ bounds.bottom = bounds.top + 100;
+
+ UInt16 tabstyle = kControlTabDirectionNorth;
+ if ( HasFlag(wxBK_LEFT) )
+ tabstyle = kControlTabDirectionWest;
+ else if ( HasFlag( wxBK_RIGHT ) )
+ tabstyle = kControlTabDirectionEast;
+ else if ( HasFlag( wxBK_BOTTOM ) )
+ tabstyle = kControlTabDirectionSouth;
+
+ ControlTabSize tabsize;
+ switch (GetWindowVariant())
{
- if (UMAGetSystemVersion() >= 0x1030 )
- tabsize = 3 ;
- else
- tabsize = kControlSizeSmall;
+ case wxWINDOW_VARIANT_MINI:
+ if ( UMAGetSystemVersion() >= 0x1030 )
+ tabsize = 3 ;
+ else
+ tabsize = kControlSizeSmall;
+ break;
+
+ case wxWINDOW_VARIANT_SMALL:
+ tabsize = kControlTabSizeSmall;
+ break;
+
+ default:
+ tabsize = kControlTabSizeLarge;
+ break;
}
- verify_noerr ( CreateTabsControl( MAC_WXHWND(parent->MacGetTopLevelWindowRef()) , &bounds ,
- tabsize , tabstyle, 0, NULL, (ControlRef*) &m_macControl) );
-
- MacPostControlCreate(pos,size) ;
- return TRUE ;
+ m_peer = new wxMacControl( this );
+ OSStatus err = CreateTabsControl(
+ MAC_WXHWND(parent->MacGetTopLevelWindowRef()), &bounds,
+ tabsize, tabstyle, 0, NULL, m_peer->GetControlRefAddr() );
+ verify_noerr( err );
+
+ MacPostControlCreate( pos, size );
+
+ return true ;
}
// dtor
wxSize wxNotebook::CalcSizeFromPage(const wxSize& sizePage) const
{
- return DoGetSizeFromClientSize( sizePage ) ;
-}
-
-wxSize wxNotebook::DoGetBestSize() const
-{
- // calculate the max page size
- wxSize size(0, 0);
-
- size_t count = GetPageCount();
- if ( count )
- {
- for ( size_t n = 0; n < count; n++ )
- {
- wxSize sizePage = m_pages[n]->GetSize();
-
- if ( size.x < sizePage.x )
- size.x = sizePage.x;
- if ( size.y < sizePage.y )
- size.y = sizePage.y;
- }
- }
- else // no pages
- {
- // use some arbitrary default size
- size.x =
- size.y = 100;
- }
-
- return CalcSizeFromPage(size);
+ return DoGetSizeFromClientSize( sizePage );
}
int wxNotebook::SetSelection(size_t nPage)
{
- wxCHECK_MSG( IS_VALID_PAGE(nPage), -1, wxT("notebook page out of range") );
+ wxCHECK_MSG( IS_VALID_PAGE(nPage), wxNOT_FOUND, wxT("SetSelection: invalid notebook page") );
if ( int(nPage) != m_nSelection )
{
bool wxNotebook::SetPageText(size_t nPage, const wxString& strText)
{
- wxASSERT( IS_VALID_PAGE(nPage) );
+ wxCHECK_MSG( IS_VALID_PAGE(nPage), false, wxT("SetPageText: invalid notebook page") );
wxNotebookPage *page = m_pages[nPage];
page->SetLabel(strText);
wxString wxNotebook::GetPageText(size_t nPage) const
{
- wxASSERT( IS_VALID_PAGE(nPage) );
+ wxCHECK_MSG( IS_VALID_PAGE(nPage), wxEmptyString, wxT("GetPageText: invalid notebook page") );
wxNotebookPage *page = m_pages[nPage];
+
return page->GetLabel();
}
int wxNotebook::GetPageImage(size_t nPage) const
{
- wxCHECK_MSG( IS_VALID_PAGE(nPage), -1, _T("invalid notebook page") );
+ wxCHECK_MSG( IS_VALID_PAGE(nPage), wxNOT_FOUND, wxT("GetPageImage: invalid notebook page") );
return m_images[nPage];
}
bool wxNotebook::SetPageImage(size_t nPage, int nImage)
{
- wxCHECK_MSG( IS_VALID_PAGE(nPage), FALSE, _T("invalid notebook page") );
-
- wxCHECK_MSG( m_imageList && nImage < m_imageList->GetImageCount(), FALSE,
- _T("invalid image index in SetPageImage()") );
+ wxCHECK_MSG( IS_VALID_PAGE(nPage), false,
+ wxT("SetPageImage: invalid notebook page") );
+ wxCHECK_MSG( m_imageList && nImage < m_imageList->GetImageCount(), false,
+ wxT("SetPageImage: invalid image index") );
if ( nImage != m_images[nPage] )
{
MacSetupTabs() ;
}
- return TRUE;
+ return true;
}
// ----------------------------------------------------------------------------
// remove one page from the notebook, without deleting the window
wxNotebookPage* wxNotebook::DoRemovePage(size_t nPage)
{
- wxCHECK( IS_VALID_PAGE(nPage), NULL );
+ wxCHECK_MSG( IS_VALID_PAGE(nPage), NULL,
+ wxT("DoRemovePage: invalid notebook page") );
+
wxNotebookPage* page = m_pages[nPage] ;
m_pages.RemoveAt(nPage);
MacSetupTabs();
- if(m_nSelection >= (int)GetPageCount()) {
+ if (m_nSelection >= (int)GetPageCount())
m_nSelection = GetPageCount() - 1;
- }
- if(m_nSelection >= 0) {
+
+ if (m_nSelection >= 0)
m_pages[m_nSelection]->Show(true);
- }
+
+ InvalidateBestSize();
+
return page;
}
WX_CLEAR_ARRAY(m_pages) ;
MacSetupTabs();
m_nSelection = -1 ;
- return TRUE;
-}
+ InvalidateBestSize();
+ return true;
+}
// same as AddPage() but does it at given position
bool wxNotebook::InsertPage(size_t nPage,
- wxNotebookPage *pPage,
- const wxString& strText,
- bool bSelect,
- int imageId)
+ wxNotebookPage *pPage,
+ const wxString& strText,
+ bool bSelect,
+ int imageId )
{
- if ( !wxNotebookBase::InsertPage(nPage, pPage, strText, bSelect, imageId) )
+ if ( !wxNotebookBase::InsertPage( nPage, pPage, strText, bSelect, imageId ) )
return false;
- wxASSERT_MSG( pPage->GetParent() == this,
- _T("notebook pages must have notebook as parent") );
+ wxASSERT_MSG( pPage->GetParent() == this, wxT("notebook pages must have notebook as parent") );
// don't show pages by default (we'll need to adjust their size first)
pPage->Show( false ) ;
- pPage->SetLabel(strText);
+ pPage->SetLabel( strText );
- m_images.Insert(imageId, nPage);
+ m_images.Insert( imageId, nPage );
MacSetupTabs();
wxRect rect = GetPageRect() ;
- pPage->SetSize(rect);
- if ( pPage->GetAutoLayout() ) {
+ pPage->SetSize( rect );
+ if ( pPage->GetAutoLayout() )
pPage->Layout();
- }
-
// now deal with the selection
// ---------------------------
// if the inserted page is before the selected one, we must update the
// index of the selected page
- if ( int(nPage) <= m_nSelection )
+ if ( int(nPage) <= m_nSelection )
{
m_nSelection++;
+
// while this still is the same page showing, we need to update the tabs
- SetControl32BitValue( (ControlRef) m_macControl , m_nSelection + 1 ) ;
+ m_peer->SetValue( m_nSelection + 1 ) ;
}
-
+
// some page should be selected: either this one or the first one if there
// is still no selection
int selNew = -1;
selNew = 0;
if ( selNew != -1 )
- SetSelection(selNew);
+ SetSelection( selNew );
+
+ InvalidateBestSize();
return true;
}
-/* Added by Mark Newsam
-* When a page is added or deleted to the notebook this function updates
-* information held in the m_macControl so that it matches the order
-* the user would expect.
-*/
+int wxNotebook::HitTest(const wxPoint& pt, long * flags) const
+{
+ int resultV = wxNOT_FOUND;
+
+#if TARGET_API_MAC_OSX
+ const int countPages = GetPageCount();
+
+ // we have to convert from Client to Window relative coordinates
+ wxPoint adjustedPt = pt + GetClientAreaOrigin();
+ // and now to HIView native ones
+ adjustedPt.x -= MacGetLeftBorderSize() ;
+ adjustedPt.y -= MacGetTopBorderSize() ;
+
+ HIPoint hipoint= { adjustedPt.x , adjustedPt.y } ;
+ HIViewPartCode outPart = 0 ;
+ OSStatus err = HIViewGetPartHit( m_peer->GetControlRef(), &hipoint, &outPart );
+
+ int max = m_peer->GetMaximum() ;
+ if ( outPart == 0 && max > 0 )
+ {
+ // this is a hack, as unfortunately a hit on an already selected tab returns 0,
+ // so we have to go some extra miles to make sure we select something different
+ // and try again ..
+ int val = m_peer->GetValue() ;
+ int maxval = max ;
+ if ( max == 1 )
+ {
+ m_peer->SetMaximum( 2 ) ;
+ maxval = 2 ;
+ }
+
+ if ( val == 1 )
+ m_peer->SetValue( maxval ) ;
+ else
+ m_peer->SetValue( 1 ) ;
+
+ err = HIViewGetPartHit( m_peer->GetControlRef(), &hipoint, &outPart );
+
+ m_peer->SetValue( val ) ;
+ if ( max == 1 )
+ m_peer->SetMaximum( 1 ) ;
+ }
+
+ if ( outPart >= 1 && outPart <= countPages )
+ resultV = outPart - 1 ;
+#endif // TARGET_API_MAC_OSX
+
+ if (flags != NULL)
+ {
+ *flags = 0;
+
+ // we cannot differentiate better
+ if (resultV >= 0)
+ *flags |= wxBK_HITTEST_ONLABEL;
+ else
+ *flags |= wxBK_HITTEST_NOWHERE;
+ }
+
+ return resultV;
+}
+
+// Added by Mark Newsam
+// When a page is added or deleted to the notebook this function updates
+// information held in the control so that it matches the order
+// the user would expect.
+//
void wxNotebook::MacSetupTabs()
{
- SetControl32BitMaximum( (ControlRef) m_macControl , GetPageCount() ) ;
+ m_peer->SetMaximum( GetPageCount() ) ;
wxNotebookPage *page;
- ControlTabInfoRec info;
+ ControlTabInfoRecV1 info;
const size_t countPages = GetPageCount();
- for(size_t ii = 0; ii < countPages; ii++)
+ for (size_t ii = 0; ii < countPages; ii++)
{
page = m_pages[ii];
- info.version = 0;
+ info.version = kControlTabInfoVersionOne;
info.iconSuiteID = 0;
- wxMacStringToPascal( page->GetLabel() , info.name ) ;
+ wxMacCFStringHolder cflabel( page->GetLabel(), m_font.GetEncoding() ) ;
+ info.name = cflabel ;
+ m_peer->SetData<ControlTabInfoRecV1>( ii + 1, kControlTabInfoTag, &info ) ;
- SetControlData( (ControlRef) m_macControl, ii+1, kControlTabInfoTag,
- sizeof( ControlTabInfoRec) , (char*) &info ) ;
- SetTabEnabled( (ControlRef) m_macControl , ii+1 , true ) ;
-#if TARGET_CARBON
if ( GetImageList() && GetPageImage(ii) >= 0 && UMAGetSystemVersion() >= 0x1020 )
{
- // tab controls only support very specific types of images, therefore we are doing an odyssee
- // accross the icon worlds (even Apple DTS did not find a shorter path)
- // in order not to pollute the icon registry we put every icon into (OSType) 1 and immediately
- // afterwards Unregister it (IconRef is ref counted, so it will stay on the tab even if we
- // unregister it) in case this will ever lead to having the same icon everywhere add some kind
- // of static counter
- const wxBitmap* bmap = GetImageList()->GetBitmap( GetPageImage(ii ) ) ;
- if ( bmap )
+ const wxBitmap bmap = GetImageList()->GetBitmap( GetPageImage( ii ) ) ;
+ if ( bmap.Ok() )
{
- wxBitmap scaledBitmap ;
- if ( bmap->GetWidth() != 16 || bmap->GetHeight() != 16 )
- {
- scaledBitmap = wxBitmap( bmap->ConvertToImage().Scale(16,16) ) ;
- bmap = &scaledBitmap ;
- }
ControlButtonContentInfo info ;
- wxMacCreateBitmapButton( &info , *bmap , kControlContentPictHandle) ;
- IconFamilyHandle iconFamily = (IconFamilyHandle) NewHandle(0) ;
- OSErr err = SetIconFamilyData( iconFamily, 'PICT' , (Handle) info.u.picture ) ;
- wxASSERT_MSG( err == noErr , wxT("Error when adding bitmap") ) ;
- IconRef iconRef ;
- err = RegisterIconRefFromIconFamily( 'WXNG' , (OSType) 1, iconFamily, &iconRef ) ;
- wxASSERT_MSG( err == noErr , wxT("Error when adding bitmap") ) ;
- info.contentType = kControlContentIconRef ;
- info.u.iconRef = iconRef ;
- SetControlData( (ControlRef) m_macControl, ii+1,kControlTabImageContentTag,
- sizeof( info ), (Ptr)&info );
+
+ wxMacCreateBitmapButton( &info, bmap ) ;
+
+ OSStatus err = m_peer->SetData<ControlButtonContentInfo>( ii + 1, kControlTabImageContentTag, &info );
wxASSERT_MSG( err == noErr , wxT("Error when setting icon on tab") ) ;
- if ( UMAGetSystemVersion() < 0x1030 )
- {
- UnregisterIconRef( 'WXNG' , (OSType) 1 ) ;
- }
-
- ReleaseIconRef( iconRef ) ;
- DisposeHandle( (Handle) iconFamily ) ;
+
+ wxMacReleaseBitmapButton( &info ) ;
}
}
-#endif
+
+ m_peer->SetTabEnabled( ii + 1, true ) ;
}
+
Rect bounds;
- UMAGetControlBoundsInWindowCoords((ControlRef)m_macControl, &bounds);
- InvalWindowRect((WindowRef)MacGetTopLevelWindowRef(), &bounds);
+ m_peer->GetRectInWindowCoords( &bounds ) ;
+ InvalWindowRect( (WindowRef)MacGetTopLevelWindowRef(), &bounds );
}
wxRect wxNotebook::GetPageRect() const
{
wxSize size = GetClientSize() ;
+
return wxRect( 0 , 0 , size.x , size.y ) ;
}
+
// ----------------------------------------------------------------------------
// wxNotebook callbacks
// ----------------------------------------------------------------------------
// time because doing it in ::Create() doesn't work (for unknown reasons)
void wxNotebook::OnSize(wxSizeEvent& event)
{
-
unsigned int nCount = m_pages.Count();
wxRect rect = GetPageRect() ;
- for ( unsigned int nPage = 0; nPage < nCount; nPage++ ) {
+
+ for ( unsigned int nPage = 0; nPage < nCount; nPage++ )
+ {
wxNotebookPage *pPage = m_pages[nPage];
pPage->SetSize(rect);
- if ( pPage->GetAutoLayout() ) {
+ if ( pPage->GetAutoLayout() )
pPage->Layout();
- }
}
// Processing continues to next OnSize
void wxNotebook::OnNavigationKey(wxNavigationKeyEvent& event)
{
- if ( event.IsWindowChange() ) {
+ if ( event.IsWindowChange() )
+ {
// change pages
- AdvanceSelection(event.GetDirection());
+ AdvanceSelection( event.GetDirection() );
}
- else {
+ else
+ {
// we get this event in 2 cases
//
// a) one of our pages might have generated it because the user TABbed
// from in this case and so can't choose between setting the focus to
// first or last panel child
wxWindow *parent = GetParent();
- // the cast is here to fic a GCC ICE
+
+ // the cast is here to fix a GCC ICE
if ( ((wxWindow*)event.GetEventObject()) == parent )
{
// no, it doesn't come from child, case (b): forward to a page
{
// so that the page knows that the event comes from it's parent
// and is being propagated downwards
- event.SetEventObject(this);
+ event.SetEventObject( this );
wxWindow *page = m_pages[m_nSelection];
- if ( !page->GetEventHandler()->ProcessEvent(event) )
+ if ( !page->GetEventHandler()->ProcessEvent( event ) )
{
page->SetFocus();
}
else
{
// it comes from our child, case (a), pass to the parent
- if ( parent ) {
- event.SetCurrentFocus(this);
- parent->GetEventHandler()->ProcessEvent(event);
+ if ( parent )
+ {
+ event.SetCurrentFocus( this );
+ parent->GetEventHandler()->ProcessEvent( event );
}
}
}
void wxNotebook::SetConstraintSizes(bool WXUNUSED(recurse))
{
- // don't set the sizes of the pages - their correct size is not yet known
- wxControl::SetConstraintSizes(FALSE);
+ // don't set the sizes of the pages - their correct size is not yet known
+ wxControl::SetConstraintSizes( false );
}
bool wxNotebook::DoPhase(int WXUNUSED(nPhase))
{
- return TRUE;
+ return true;
}
#endif // wxUSE_CONSTRAINTS
// hide the currently active panel and show the new one
void wxNotebook::ChangePage(int nOldSel, int nSel)
{
- if ( nOldSel != -1 )
- {
- m_pages[nOldSel]->Show(FALSE);
- }
+ if (nOldSel == nSel)
+ return;
+
+ if ( nOldSel != -1 )
+ m_pages[nOldSel]->Show( false );
if ( nSel != -1 )
{
wxNotebookPage *pPage = m_pages[nSel];
- pPage->Show(TRUE);
+ pPage->Show( true );
pPage->SetFocus();
}
-
+
m_nSelection = nSel;
- SetControl32BitValue( (ControlRef) m_macControl , m_nSelection + 1 ) ;
+ m_peer->SetValue( m_nSelection + 1 ) ;
}
-wxInt32 wxNotebook::MacControlHit(WXEVENTHANDLERREF WXUNUSED(handler) , WXEVENTREF WXUNUSED(event) )
+wxInt32 wxNotebook::MacControlHit(WXEVENTHANDLERREF WXUNUSED(handler) , WXEVENTREF WXUNUSED(event) )
{
OSStatus status = eventNotHandledErr ;
-
- SInt32 newSel = GetControl32BitValue( (ControlRef) m_macControl ) - 1 ;
+
+ SInt32 newSel = m_peer->GetValue() - 1 ;
if ( newSel != m_nSelection )
{
- wxNotebookEvent changing(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGING, m_windowId,
- newSel , m_nSelection);
- changing.SetEventObject(this);
- GetEventHandler()->ProcessEvent(changing);
+ wxNotebookEvent changing(
+ wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGING, m_windowId,
+ newSel , m_nSelection );
+ changing.SetEventObject( this );
+ GetEventHandler()->ProcessEvent( changing );
- if(changing.IsAllowed())
+ if ( changing.IsAllowed() )
{
- wxNotebookEvent event(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED, m_windowId,
- newSel, m_nSelection);
- event.SetEventObject(this);
-
- GetEventHandler()->ProcessEvent(event);
+ wxNotebookEvent event(
+ wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED, m_windowId,
+ newSel, m_nSelection );
+ event.SetEventObject( this );
+ GetEventHandler()->ProcessEvent( event );
}
else
{
- SetControl32BitValue( (ControlRef) m_macControl , m_nSelection + 1 ) ;
+ m_peer->SetValue( m_nSelection + 1 ) ;
}
+
status = noErr ;
}
- return status ;
+
+ return (wxInt32)status ;
}
+#endif
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