]> git.saurik.com Git - wxWidgets.git/blobdiff - src/common/prntbase.cpp
Committing in .
[wxWidgets.git] / src / common / prntbase.cpp
index 4de06a39dec3b420a8d0e839eb97fb657255794d..4f5860323fb3c54ff39c4aabd6522399fa81f44d 100644 (file)
@@ -5,8 +5,8 @@
 // Modified by:
 // Created:     04/01/98
 // RCS-ID:      $Id$
-// Copyright:   (c) Julian Smart and Markus Holzem
-// Licence:       wxWindows license
+// Copyright:   (c) Julian Smart
+// Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 #ifdef __GNUG__
@@ -36,7 +36,9 @@
 #include "wx/dcmemory.h"
 #include "wx/stattext.h"
 #include "wx/intl.h"
-#endif
+#include "wx/textdlg.h"
+#include "wx/sizer.h"
+#endif // !WX_PRECOMP
 
 #include "wx/prntbase.h"
 #include "wx/dcprint.h"
@@ -55,7 +57,6 @@
     #endif
 #endif // __WXMSW__
 
-#if !USE_SHARED_LIBRARY
 IMPLEMENT_CLASS(wxPrinterBase, wxObject)
 IMPLEMENT_ABSTRACT_CLASS(wxPrintout, wxObject)
 IMPLEMENT_CLASS(wxPreviewCanvas, wxWindow)
@@ -71,7 +72,6 @@ BEGIN_EVENT_TABLE(wxPreviewCanvas, wxScrolledWindow)
     EVT_PAINT(wxPreviewCanvas::OnPaint)
     EVT_SYS_COLOUR_CHANGED(wxPreviewCanvas::OnSysColourChanged)
 END_EVENT_TABLE()
-#endif
 
 /*
 * Printer
@@ -84,10 +84,12 @@ wxPrinterBase::wxPrinterBase(wxPrintDialogData *data)
     sm_abortIt = FALSE;
     if (data)
         m_printDialogData = (*data);
+    sm_lastError = wxPRINTER_NO_ERROR;
 }
 
 wxWindow *wxPrinterBase::sm_abortWindow = (wxWindow *) NULL;
 bool wxPrinterBase::sm_abortIt = FALSE;
+wxPrinterError wxPrinterBase::sm_lastError = wxPRINTER_NO_ERROR;
 
 wxPrinterBase::~wxPrinterBase()
 {
@@ -101,21 +103,24 @@ void wxPrintAbortDialog::OnCancel(wxCommandEvent& WXUNUSED(event))
     wxPrinterBase::sm_abortWindow = (wxWindow *) NULL;
 }
 
-wxWindow *wxPrinterBase::CreateAbortWindow(wxWindow *parent, wxPrintout *WXUNUSED(printout))
+wxWindow *wxPrinterBase::CreateAbortWindow(wxWindow *parent, wxPrintout * printout)
 {
-    wxPrintAbortDialog *dialog = new wxPrintAbortDialog(parent, _("Printing"), wxPoint(0, 0), wxSize(400, 400), wxDEFAULT_DIALOG_STYLE);
-    (void) new wxStaticText(dialog, -1, _("Please wait..."), wxPoint(5, 5));
+    wxPrintAbortDialog *dialog = new wxPrintAbortDialog(parent, _("Printing ") , wxDefaultPosition, wxDefaultSize, wxDEFAULT_DIALOG_STYLE);
+
+    wxBoxSizer *button_sizer = new wxBoxSizer( wxVERTICAL );
+    button_sizer->Add( new wxStaticText(dialog, -1, _("Please wait while printing\n") + printout->GetTitle() ), 0, wxALL, 10 );
+    button_sizer->Add( new wxButton( dialog, wxID_CANCEL, wxT("Cancel") ), 0, wxALL | wxALIGN_CENTER, 10 );
 
-    wxButton *button = new wxButton(dialog, wxID_CANCEL, _("Cancel"), wxPoint(5, 30));
+    dialog->SetAutoLayout( TRUE );
+    dialog->SetSizer( button_sizer );
 
-    dialog->Fit();
-    button->Centre(wxHORIZONTAL);
+    button_sizer->Fit(dialog);
+    button_sizer->SetSizeHints (dialog) ;
 
-    dialog->Centre();
     return dialog;
 }
 
-void wxPrinterBase::ReportError(wxWindow *parent, wxPrintout *WXUNUSED(printout), char *message)
+void wxPrinterBase::ReportError(wxWindow *parent, wxPrintout *WXUNUSED(printout), const wxString& message)
 {
     wxMessageBox(message, _("Printing Error"), wxOK, parent);
 }
@@ -145,7 +150,7 @@ wxPrintout::~wxPrintout()
 
 bool wxPrintout::OnBeginDocument(int WXUNUSED(startPage), int WXUNUSED(endPage))
 {
-    return GetDC()->StartDoc(_("Printing"));
+    return GetDC()->StartDoc(_("Printing ") + m_printoutTitle);
 }
 
 void wxPrintout::OnEndDocument()
@@ -183,7 +188,14 @@ wxPreviewCanvas::wxPreviewCanvas(wxPrintPreviewBase *preview, wxWindow *parent,
 wxScrolledWindow(parent, -1, pos, size, style, name)
 {
     m_printPreview = preview;
-    SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_APPWORKSPACE));
+#ifdef __WXMAC__
+    // The app workspace colour is always white, but we should have
+    // a contrast with the page.
+    wxSystemColour colourIndex = wxSYS_COLOUR_3DDKSHADOW;
+#else
+    wxSystemColour colourIndex = wxSYS_COLOUR_APPWORKSPACE;
+#endif    
+    SetBackgroundColour(wxSystemSettings::GetColour(colourIndex));
 
     SetScrollbars(15, 18, 100, 100);
 }
@@ -197,6 +209,13 @@ void wxPreviewCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
     wxPaintDC dc(this);
     PrepareDC( dc );
 
+/*
+#ifdef __WXGTK__
+    if (!GetUpdateRegion().IsEmpty())
+        dc.SetClippingRegion( GetUpdateRegion() );
+#endif
+*/
+
     if (m_printPreview)
     {
         m_printPreview->PaintPage(this, dc);
@@ -206,7 +225,14 @@ void wxPreviewCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
 // Responds to colour changes, and passes event on to children.
 void wxPreviewCanvas::OnSysColourChanged(wxSysColourChangedEvent& event)
 {
-    SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_APPWORKSPACE));
+#ifdef __WXMAC__
+    // The app workspace colour is always white, but we should have
+    // a contrast with the page.
+    wxSystemColour colourIndex = wxSYS_COLOUR_3DDKSHADOW;
+#else
+    wxSystemColour colourIndex = wxSYS_COLOUR_APPWORKSPACE;
+#endif    
+    SetBackgroundColour(wxSystemSettings::GetColour(colourIndex));
     Refresh();
 
     // Propagate the event to the non-top-level children
@@ -222,6 +248,9 @@ BEGIN_EVENT_TABLE(wxPreviewControlBar, wxPanel)
     EVT_BUTTON(wxID_PREVIEW_PRINT,    wxPreviewControlBar::OnPrint)
     EVT_BUTTON(wxID_PREVIEW_PREVIOUS, wxPreviewControlBar::OnPreviousButton)
     EVT_BUTTON(wxID_PREVIEW_NEXT,     wxPreviewControlBar::OnNextButton)
+    EVT_BUTTON(wxID_PREVIEW_FIRST,    wxPreviewControlBar::OnFirstButton)
+    EVT_BUTTON(wxID_PREVIEW_LAST,     wxPreviewControlBar::OnLastButton)
+    EVT_BUTTON(wxID_PREVIEW_GOTO,     wxPreviewControlBar::OnGotoButton)
     EVT_CHAR(wxPreviewControlBar::OnChar)
     EVT_CHOICE(wxID_PREVIEW_ZOOM,     wxPreviewControlBar::OnZoom)
     EVT_PAINT(wxPreviewControlBar::OnPaint)
@@ -270,12 +299,18 @@ void wxPreviewControlBar::OnPrint(wxCommandEvent& WXUNUSED(event))
 
 void wxPreviewControlBar::OnChar(wxKeyEvent &event)
 {
-   switch(event.KeyCode())
+   switch(event.GetKeyCode())
    {
    case WXK_NEXT:
       OnNext(); break;
    case WXK_PRIOR:
       OnPrevious(); break;
+   case WXK_HOME:
+      OnFirst(); break;
+   case WXK_END:
+      OnLast(); break;
+   case WXK_TAB:
+      OnGoto(); break;
    default:
       event.Skip();
    }
@@ -311,97 +346,138 @@ void wxPreviewControlBar::OnPrevious(void)
     }
 }
 
-void wxPreviewControlBar::OnZoom(wxCommandEvent& WXUNUSED(event))
+void wxPreviewControlBar::OnFirst(void)
 {
-    int zoom = GetZoomControl();
-    if (GetPrintPreview())
-        GetPrintPreview()->SetZoom(zoom);
+    wxPrintPreviewBase *preview = GetPrintPreview();
+    if (preview)
+    {
+        int currentPage = preview->GetMinPage();
+        if (preview->GetPrintout()->HasPage(currentPage))
+        {
+            preview->SetCurrentPage(currentPage);
+        }
+    }
 }
 
-void wxPreviewControlBar::CreateButtons()
+void wxPreviewControlBar::OnLast(void)
 {
-    SetSize(0, 0, 400, 40);
+    wxPrintPreviewBase *preview = GetPrintPreview();
+    if (preview)
+    {
+        int currentPage = preview->GetMaxPage();
+        if (preview->GetPrintout()->HasPage(currentPage))
+        {
+            preview->SetCurrentPage(currentPage);
+        }
+    }
+}
 
-    /*
-    #ifdef __WXMSW__
-    int fontSize = 9;
-    #else
-    int fontSize = 10;
-    #endif
+void wxPreviewControlBar::OnGoto(void)
+{
+    wxPrintPreviewBase *preview = GetPrintPreview();
+    if (preview)
+    {
+        long currentPage;
 
-      wxFont buttonFont(fontSize, wxSWISS, wxNORMAL, wxBOLD);
-      SetFont(buttonFont);
-    */
+        if (preview->GetMinPage() > 0)
+        {
+            wxString strPrompt;
+            wxString strPage;
 
-    int buttonWidth = 65;
-#ifdef __WXGTK__
-    int buttonHeight = -1;
-#else
-    int buttonHeight = 24;
-#endif
+            strPrompt.Printf( wxT("%d...%d"),
+                preview->GetMinPage(), preview->GetMaxPage());
+            strPage.Printf( wxT("%d"), preview->GetCurrentPage() );
 
-    int x = 5;
-    int y = 5;
+            strPage =
+                wxGetTextFromUser( strPrompt, _("Goto Page"), strPage);
 
-#ifdef __WXMOTIF__
-    int gap = 15;
-#else
-    int gap = 5;
-#endif
+            if ( strPage.ToLong( &currentPage ) )
+                if (preview->GetPrintout()->HasPage(currentPage))
+                {
+                    preview->SetCurrentPage(currentPage);
+                }
+        }
+    }
+}
 
-    m_closeButton = new wxButton(this, wxID_PREVIEW_CLOSE, _("Close"),
-        wxPoint(x, y), wxSize(buttonWidth, buttonHeight));
+void wxPreviewControlBar::OnZoom(wxCommandEvent& WXUNUSED(event))
+{
+    int zoom = GetZoomControl();
+    if (GetPrintPreview())
+        GetPrintPreview()->SetZoom(zoom);
+}
 
-    x += gap + buttonWidth;
+void wxPreviewControlBar::CreateButtons()
+{
+    SetSize(0, 0, 400, 40);
 
+    wxBoxSizer *item0 = new wxBoxSizer( wxHORIZONTAL );
+    
+    int smallButtonWidth = 45;
+    
+    m_closeButton = new wxButton( this, wxID_PREVIEW_CLOSE, _("&Close"), wxDefaultPosition, wxDefaultSize, 0 );
+    item0->Add( m_closeButton, 0, wxALIGN_CENTRE|wxALL, 5 );
+    
     if (m_buttonFlags & wxPREVIEW_PRINT)
     {
-        m_printButton =  new wxButton(this, wxID_PREVIEW_PRINT, _("Print..."), wxPoint(x, y),
-            wxSize(buttonWidth, buttonHeight));
-        x += gap + buttonWidth;
+        m_printButton = new wxButton( this, wxID_PREVIEW_PRINT, _("&Print..."), wxDefaultPosition, wxDefaultSize, 0 );
+        item0->Add( m_printButton, 0, wxALIGN_CENTRE|wxALL, 5 );
     }
-
+    
+    if (m_buttonFlags & wxPREVIEW_FIRST)
+    {
+        m_firstPageButton = new wxButton( this, wxID_PREVIEW_FIRST, _("|<<"), wxDefaultPosition, wxSize(smallButtonWidth,-1), 0 );
+        item0->Add( m_firstPageButton, 0, wxALIGN_CENTRE|wxALL, 5 );
+    }
+    
     if (m_buttonFlags & wxPREVIEW_PREVIOUS)
     {
-        m_previousPageButton = new wxButton(this, wxID_PREVIEW_PREVIOUS, "<<", wxPoint(x, y),
-            wxSize(buttonWidth, buttonHeight));
-        x += gap + buttonWidth;
+        m_previousPageButton = new wxButton( this, wxID_PREVIEW_PREVIOUS, _("<<"), wxDefaultPosition, wxSize(smallButtonWidth,-1), 0 );
+        item0->Add( m_previousPageButton, 0, wxALIGN_CENTRE|wxRIGHT|wxTOP|wxBOTTOM, 5 );
     }
-
+    
     if (m_buttonFlags & wxPREVIEW_NEXT)
     {
-        m_nextPageButton = new wxButton(this, wxID_PREVIEW_NEXT, ">>",
-            wxPoint(x, y), wxSize(buttonWidth, buttonHeight));
-        x += gap + buttonWidth;
+        m_nextPageButton = new wxButton( this, wxID_PREVIEW_NEXT, _(">>"), wxDefaultPosition, wxSize(smallButtonWidth,-1), 0 );
+        item0->Add( m_nextPageButton, 0, wxALIGN_CENTRE|wxRIGHT|wxTOP|wxBOTTOM, 5 );
     }
-
+    
+    if (m_buttonFlags & wxPREVIEW_LAST)
+    {
+        m_lastPageButton = new wxButton( this, wxID_PREVIEW_LAST, _(">>|"), wxDefaultPosition, wxSize(smallButtonWidth,-1), 0 );
+        item0->Add( m_lastPageButton, 0, wxALIGN_CENTRE|wxRIGHT|wxTOP|wxBOTTOM, 5 );
+    }
+    
+    if (m_buttonFlags & wxPREVIEW_GOTO)
+    {
+        m_gotoPageButton = new wxButton( this, wxID_PREVIEW_GOTO, _("&Goto..."), wxDefaultPosition, wxDefaultSize, 0 );
+        item0->Add( m_gotoPageButton, 0, wxALIGN_CENTRE|wxALL, 5 );
+    }
+    
     if (m_buttonFlags & wxPREVIEW_ZOOM)
     {
-        static const char *choices[] =
+        wxString choices[] = 
         {
-            "10%", "15%", "20%", "25%", "30%", "35%", "40%", "45%", "50%", "55%",
-            "60%", "65%", "70%", "75%", "80%", "85%", "90%", "95%", "100%", "110%",
-            "120%", "150%", "200%"
+            wxT("10%"), wxT("15%"), wxT("20%"), wxT("25%"), wxT("30%"), wxT("35%"), wxT("40%"), wxT("45%"), wxT("50%"), wxT("55%"),
+                wxT("60%"), wxT("65%"), wxT("70%"), wxT("75%"), wxT("80%"), wxT("85%"), wxT("90%"), wxT("95%"), wxT("100%"), wxT("110%"),
+                wxT("120%"), wxT("150%"), wxT("200%")
         };
-
-        m_zoomControl = new wxChoice(this, wxID_PREVIEW_ZOOM,
-                                     wxPoint(x, y), wxSize(100, -1));
-                                    
-        // Yes, this look stupid, but this is because gcc gives up otherwise.
         int n = WXSIZEOF(choices);
-        for ( int i = 0; i < n; i++ )
-           m_zoomControl->Append(choices[i]);
-       
+        
+        m_zoomControl = new wxChoice( this, wxID_PREVIEW_ZOOM, wxDefaultPosition, wxSize(70,-1), n, choices, 0 );
+        item0->Add( m_zoomControl, 0, wxALIGN_CENTRE|wxALL, 5 );
         SetZoomControl(m_printPreview->GetZoom());
     }
 
-    //  m_closeButton->SetDefault();
+    SetSizer(item0);
+    item0->Fit(this);
 }
 
 void wxPreviewControlBar::SetZoomControl(int zoom)
 {
-    char buf[20];
-    sprintf(buf, "%d%%", zoom);
+    wxChar buf[20];
+    wxSprintf( buf, wxT("%d%%"), zoom );
+
     if (m_zoomControl)
         m_zoomControl->SetStringSelection(buf);
 }
@@ -409,7 +485,7 @@ void wxPreviewControlBar::SetZoomControl(int zoom)
 int wxPreviewControlBar::GetZoomControl()
 {
     wxChar buf[20];
-    if (m_zoomControl && (m_zoomControl->GetStringSelection() != T("")))
+    if (m_zoomControl && (m_zoomControl->GetStringSelection() != wxT("")))
     {
         wxStrcpy(buf, m_zoomControl->GetStringSelection());
         buf[wxStrlen(buf) - 1] = 0;
@@ -427,13 +503,20 @@ BEGIN_EVENT_TABLE(wxPreviewFrame, wxFrame)
     EVT_CLOSE(wxPreviewFrame::OnCloseWindow)
 END_EVENT_TABLE()
 
-wxPreviewFrame::wxPreviewFrame(wxPrintPreviewBase *preview, wxFrame *parent, const wxString& title,
+wxPreviewFrame::wxPreviewFrame(wxPrintPreviewBase *preview, wxWindow *parent, const wxString& title,
                                const wxPoint& pos, const wxSize& size, long style, const wxString& name):
 wxFrame(parent, -1, title, pos, size, style, name)
 {
     m_printPreview = preview;
     m_controlBar = NULL;
     m_previewCanvas = NULL;
+
+    // Give the application icon
+#ifdef __WXMSW__
+    wxFrame* topFrame = wxDynamicCast(wxTheApp->GetTopWindow(), wxFrame);
+    if (topFrame)
+        SetIcon(topFrame->GetIcon());
+#endif    
 }
 
 wxPreviewFrame::~wxPreviewFrame()
@@ -442,7 +525,11 @@ wxPreviewFrame::~wxPreviewFrame()
 
 void wxPreviewFrame::OnCloseWindow(wxCloseEvent& WXUNUSED(event))
 {
+    // MakeModal doesn't work on wxMac, especially when there
+    // are multiple top-level windows.
+#ifndef __WXMAC__
     MakeModal(FALSE);
+#endif    
 
     // Need to delete the printout and the print preview
     wxPrintout *printout = m_printPreview->GetPrintout();
@@ -460,47 +547,28 @@ void wxPreviewFrame::OnCloseWindow(wxCloseEvent& WXUNUSED(event))
 
 void wxPreviewFrame::Initialize()
 {
+#if wxUSE_STATUSBAR
     CreateStatusBar();
-
+#endif
     CreateCanvas();
     CreateControlBar();
 
     m_printPreview->SetCanvas(m_previewCanvas);
     m_printPreview->SetFrame(this);
 
-    // Set layout constraints here
-
-    // Control bar constraints
-    wxLayoutConstraints *c1 = new wxLayoutConstraints;
-    //  int w, h;
-    //  m_controlBar->GetSize(&w, &h);
-    int h;
-#if (defined(__WXMSW__) || defined(__WXGTK__))
-    h = 40;
-#else
-    h = 60;
-#endif
-
-    c1->left.SameAs       (this, wxLeft);
-    c1->top.SameAs        (this, wxTop);
-    c1->right.SameAs      (this, wxRight);
-    c1->height.Absolute   (h);
-
-    m_controlBar->SetConstraints(c1);
-
-    // Canvas constraints
-    wxLayoutConstraints *c2 = new wxLayoutConstraints;
+    wxBoxSizer *item0 = new wxBoxSizer( wxVERTICAL );
 
-    c2->left.SameAs       (this, wxLeft);
-    c2->top.Below         (m_controlBar);
-    c2->right.SameAs      (this, wxRight);
-    c2->bottom.SameAs     (this, wxBottom);
+    item0->Add( m_controlBar, 0, wxGROW|wxALIGN_CENTER_VERTICAL, 5 );
+    item0->Add( m_previewCanvas, 1, wxGROW|wxALIGN_CENTER_VERTICAL, 5 );
 
-    m_previewCanvas->SetConstraints(c2);
-
-    SetAutoLayout(TRUE);
+    SetAutoLayout( TRUE );
+    SetSizer( item0 );
 
+    // MakeModal doesn't work on wxMac, especially when there
+    // are multiple top-level windows.
+#ifndef __WXMAC__
     MakeModal(TRUE);
+#endif
 
     Layout();
 }
@@ -597,7 +665,8 @@ bool wxPrintPreviewBase::SetCurrentPage(int pageNum)
 
     if (m_previewCanvas)
     {
-        RenderPage(pageNum);
+        if (!RenderPage(pageNum))
+            return FALSE;
         m_previewCanvas->Refresh();
     }
     return TRUE;
@@ -608,7 +677,8 @@ bool wxPrintPreviewBase::PaintPage(wxWindow *canvas, wxDC& dc)
     DrawBlankPage(canvas, dc);
 
     if (!m_previewBitmap)
-        RenderPage(m_currentPage);
+        if (!RenderPage(m_currentPage))
+            return FALSE;
 
     if (!m_previewBitmap)
         return FALSE;
@@ -640,12 +710,14 @@ bool wxPrintPreviewBase::PaintPage(wxWindow *canvas, wxDC& dc)
 
 bool wxPrintPreviewBase::RenderPage(int pageNum)
 {
+    wxBusyCursor busy;
+
     int canvasWidth, canvasHeight;
 
     if (!m_previewCanvas)
     {
-        wxMessageBox(_("wxPrintPreviewBase::RenderPage: must use wxPrintPreviewBase::SetCanvas to let me know about the canvas!"),
-            _("Print Preview Failure"), wxOK);
+        wxFAIL_MSG(_T("wxPrintPreviewBase::RenderPage: must use wxPrintPreviewBase::SetCanvas to let me know about the canvas!"));
+
         return FALSE;
     }
     m_previewCanvas->GetSize(&canvasWidth, &canvasHeight);
@@ -665,8 +737,10 @@ bool wxPrintPreviewBase::RenderPage(int pageNum)
         m_previewBitmap = new wxBitmap((int)actualWidth, (int)actualHeight);
         if (!m_previewBitmap || !m_previewBitmap->Ok())
         {
-            if (m_previewBitmap)
+            if (m_previewBitmap) {
                 delete m_previewBitmap;
+                m_previewBitmap = NULL;
+            }
             wxMessageBox(_("Sorry, not enough memory to create a preview."), _("Print Preview Failure"), wxOK);
             return FALSE;
         }
@@ -696,6 +770,7 @@ bool wxPrintPreviewBase::RenderPage(int pageNum)
         memoryDC.SelectObject(wxNullBitmap);
 
         delete m_previewBitmap;
+        m_previewBitmap = NULL;
         return FALSE;
     }
 
@@ -707,14 +782,16 @@ bool wxPrintPreviewBase::RenderPage(int pageNum)
 
     memoryDC.SelectObject(wxNullBitmap);
 
-    wxChar buf[200];
+#if wxUSE_STATUSBAR
+    wxString status;
     if (m_maxPage != 0)
-        wxSprintf(buf, _("Page %d of %d"), pageNum, m_maxPage);
+               status = wxString::Format(_("Page %d of %d"), pageNum, m_maxPage);
     else
-        wxSprintf(buf, _("Page %d"), pageNum);
+               status = wxString::Format(_("Page %d"), pageNum);
 
     if (m_previewFrame)
-        m_previewFrame->SetStatusText(buf);
+        m_previewFrame->SetStatusText(status);
+#endif
 
     return TRUE;
 }
@@ -772,10 +849,10 @@ void wxPrintPreviewBase::SetZoom(int percent)
         m_previewBitmap = NULL;
     }
 
-
     if (m_previewCanvas)
     {
         RenderPage(m_currentPage);
+        ((wxScrolledWindow *) m_previewCanvas)->Scroll(0, 0);
         m_previewCanvas->Clear();
         m_previewCanvas->Refresh();
     }