path: root/sd/source/ui/tools/PreviewRenderer.cxx

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 *
 * Copyright 2008 by Sun Microsystems, Inc.
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 * OpenOffice.org - a multi-platform office productivity suite
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 * $RCSfile: PreviewRenderer.cxx,v $
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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_sd.hxx"

#include "PreviewRenderer.hxx"

#include "DrawDocShell.hxx"
#include "drawdoc.hxx"
#include "drawview.hxx"
#include "sdpage.hxx"
#include "ViewShell.hxx"
#include <vcl/virdev.hxx>
#include <svx/svdpagv.hxx>
#include <svx/svdoutl.hxx>
#include <editeng/eeitem.hxx>
#include <editeng/editstat.hxx>
#include <tools/link.hxx>
#include <vcl/svapp.hxx>


namespace sd {

const int PreviewRenderer::snSubstitutionTextSize = 11;
const int PreviewRenderer::snFrameWidth = 1;

PreviewRenderer::PreviewRenderer (
    OutputDevice* pTemplate,
    const bool bHasFrame)
    : mpPreviewDevice (new VirtualDevice()),
      mpView(NULL),
      mpDocShellOfView(NULL),
      mnWidthOfView(0),
      maFrameColor (svtools::ColorConfig().GetColorValue(svtools::DOCBOUNDARIES).nColor),
      mbHasFrame(bHasFrame)
{
    if (pTemplate != NULL)
    {
        mpPreviewDevice->SetDigitLanguage (pTemplate->GetDigitLanguage());
        mpPreviewDevice->SetBackground(pTemplate->GetBackground());
    }
    else
        mpPreviewDevice->SetBackground(Wallpaper(COL_WHITE));
}




PreviewRenderer::~PreviewRenderer (void)
{
    if (mpDocShellOfView != NULL)
        EndListening (*mpDocShellOfView);
}




Image PreviewRenderer::RenderPage (
    const SdPage* pPage,
    const sal_Int32 nWidth,
    const String& rSubstitutionText,
    const bool bObeyHighContrastMode)
{
    if (pPage != NULL)
    {
        const Size aPageModelSize (pPage->GetSize());
        const double nAspectRatio (
            double(aPageModelSize.Width()) / double(aPageModelSize.Height()));
        const sal_Int32 nFrameWidth (mbHasFrame ? snFrameWidth : 0);
        const sal_Int32 nHeight (sal::static_int_cast<sal_Int32>(
            (nWidth - 2*nFrameWidth) / nAspectRatio + 2*nFrameWidth + 0.5));
        return RenderPage (pPage, Size(nWidth,nHeight), rSubstitutionText, bObeyHighContrastMode);
    }
    else
        return Image();
}




Image PreviewRenderer::RenderPage (
    const SdPage* pPage,
    Size aPixelSize,
    const String& rSubstitutionText,
    const bool bObeyHighContrastMode)
{
    Image aPreview;

    if (pPage != NULL)
    {
        try
        {
            if (Initialize (pPage, aPixelSize, bObeyHighContrastMode))
            {
                PaintPage (pPage);
                PaintSubstitutionText (rSubstitutionText);
                PaintFrame();

                Size aSize (mpPreviewDevice->GetOutputSizePixel());
                aPreview = mpPreviewDevice->GetBitmap (
                    mpPreviewDevice->PixelToLogic(Point(0,0)),
                    mpPreviewDevice->PixelToLogic(aSize));

                Cleanup();
            }
        }
        catch (const com::sun::star::uno::Exception&)
        {
            OSL_TRACE("PreviewRenderer::RenderPage: caught exception");
        }
    }

    return aPreview;
}




Image PreviewRenderer::RenderSubstitution (
    const Size& rPreviewPixelSize,
    const String& rSubstitutionText)
{
    Image aPreview;

    try
    {
        // Set size.
        mpPreviewDevice->SetOutputSizePixel(rPreviewPixelSize);

        // Adjust contrast mode.
        bool bUseContrast = Application::GetSettings().GetStyleSettings().
            GetHighContrastMode();
        mpPreviewDevice->SetDrawMode (bUseContrast
            ? ViewShell::OUTPUT_DRAWMODE_CONTRAST
            : ViewShell::OUTPUT_DRAWMODE_COLOR);

        // Set a map mode makes a typical substitution text completely
        // visible.
        MapMode aMapMode (mpPreviewDevice->GetMapMode());
        aMapMode.SetMapUnit(MAP_100TH_MM);
        double nFinalScale (25.0 * rPreviewPixelSize.Width() / 28000.0);
        aMapMode.SetScaleX(nFinalScale);
        aMapMode.SetScaleY(nFinalScale);
        const sal_Int32 nFrameWidth (mbHasFrame ? snFrameWidth : 0);
        aMapMode.SetOrigin(mpPreviewDevice->PixelToLogic(
            Point(nFrameWidth,nFrameWidth),aMapMode));
        mpPreviewDevice->SetMapMode (aMapMode);

        // Clear the background.
        Rectangle aPaintRectangle (
            Point(0,0),
            mpPreviewDevice->GetOutputSizePixel());
        mpPreviewDevice->EnableMapMode(FALSE);
        mpPreviewDevice->SetLineColor();
        svtools::ColorConfig aColorConfig;
        mpPreviewDevice->SetFillColor(aColorConfig.GetColorValue(svtools::DOCCOLOR).nColor);
        mpPreviewDevice->DrawRect (aPaintRectangle);
        mpPreviewDevice->EnableMapMode(TRUE);

        // Paint substitution text and a frame around it.
        PaintSubstitutionText (rSubstitutionText);
        PaintFrame();

        Size aSize (mpPreviewDevice->GetOutputSizePixel());
        aPreview = mpPreviewDevice->GetBitmap (
            mpPreviewDevice->PixelToLogic(Point(0,0)),
            mpPreviewDevice->PixelToLogic(aSize));
    }
    catch (const com::sun::star::uno::Exception&)
    {
        OSL_TRACE("PreviewRenderer::RenderPage: caught exception");
    }

    return aPreview;
}




bool PreviewRenderer::Initialize (
    const SdPage* pPage,
    const Size& rPixelSize,
    const bool bObeyHighContrastMode)
{
    bool bSuccess = false;
    do
    {
        if (pPage == NULL)
            break;

        SdrModel* pModel = pPage->GetModel();
        if (pModel == NULL)
            break;

        SetupOutputSize(*pPage, rPixelSize);

        SdDrawDocument* pDocument
            = static_cast<SdDrawDocument*>(pPage->GetModel());
        DrawDocShell* pDocShell = pDocument->GetDocSh();

        // Create view
        ProvideView (pDocShell);
        if (mpView.get() == NULL)
            break;

        // Adjust contrast mode.
        bool bUseContrast (bObeyHighContrastMode
            && Application::GetSettings().GetStyleSettings().GetHighContrastMode());
        mpPreviewDevice->SetDrawMode (bUseContrast
            ? ViewShell::OUTPUT_DRAWMODE_CONTRAST
            : ViewShell::OUTPUT_DRAWMODE_COLOR);
        mpPreviewDevice->SetSettings(Application::GetSettings());

        // Tell the view to show the given page.
        SdPage* pNonConstPage = const_cast<SdPage*>(pPage);
        if (pPage->IsMasterPage())
        {
            mpView->ShowSdrPage(mpView->GetModel()->GetMasterPage(pPage->GetPageNum()));
        }
        else
        {
            mpView->ShowSdrPage(pNonConstPage);
        }

        // Make sure that a page view exists.
        SdrPageView* pPageView = mpView->GetSdrPageView();
        if (pPageView == NULL)
            break;
        // Set background color of page view and outliner.
        svtools::ColorConfig aColorConfig;
        const Color aPageBackgroundColor(pPage->GetPageBackgroundColor(pPageView));
        pPageView->SetApplicationBackgroundColor(aPageBackgroundColor);
        SdrOutliner& rOutliner (pDocument->GetDrawOutliner(NULL));
        rOutliner.SetBackgroundColor(aPageBackgroundColor);
        rOutliner.SetDefaultLanguage(pDocument->GetLanguage(EE_CHAR_LANGUAGE));
        mpView->SetApplicationBackgroundColor(
            Color(aColorConfig.GetColorValue(svtools::APPBACKGROUND).nColor));

        bSuccess = true;
    }
    while (false);

    return bSuccess;
}




void PreviewRenderer::Cleanup (void)
{
    mpView->HideSdrPage();
}




void PreviewRenderer::PaintPage (const SdPage* pPage)
{
    // Paint the page.
    Rectangle aPaintRectangle (Point(0,0), pPage->GetSize());
    Region aRegion (aPaintRectangle);

    // Turn off online spelling and redlining.
    SdrOutliner* pOutliner = NULL;
    ULONG nOriginalControlWord = 0;
    if (mpDocShellOfView!=NULL && mpDocShellOfView->GetDoc()!=NULL)
    {
        pOutliner = &mpDocShellOfView->GetDoc()->GetDrawOutliner();
        nOriginalControlWord = pOutliner->GetControlWord();
        pOutliner->SetControlWord(
            (nOriginalControlWord & ~EE_CNTRL_ONLINESPELLING));
    }

    try
    {
        mpView->CompleteRedraw (mpPreviewDevice.get(), aRegion);
    }
    catch (const ::com::sun::star::uno::Exception&)
    {
        OSL_TRACE("PreviewRenderer::PaintPage: caught exception");
    }

    // Restore the previous online spelling and redlining states.
    if (pOutliner != NULL)
        pOutliner->SetControlWord(nOriginalControlWord);
}




void PreviewRenderer::PaintSubstitutionText (const String& rSubstitutionText)
{
    if (rSubstitutionText.Len() > 0)
    {
        // Set the font size.
        const Font& rOriginalFont (mpPreviewDevice->GetFont());
        Font aFont (mpPreviewDevice->GetSettings().GetStyleSettings().GetAppFont());
        sal_Int32 nHeight (mpPreviewDevice->PixelToLogic(Size(0,snSubstitutionTextSize)).Height());
        aFont.SetHeight(nHeight);
        mpPreviewDevice->SetFont (aFont);

        // Paint the substitution text.
        Rectangle aTextBox (
            Point(0,0),
            mpPreviewDevice->PixelToLogic(
                mpPreviewDevice->GetOutputSizePixel()));
        USHORT nTextStyle =
            TEXT_DRAW_CENTER
            | TEXT_DRAW_VCENTER
            | TEXT_DRAW_MULTILINE
            | TEXT_DRAW_WORDBREAK;
        mpPreviewDevice->DrawText (aTextBox, rSubstitutionText, nTextStyle);

        // Restore the font.
        mpPreviewDevice->SetFont (rOriginalFont);
    }
}




void PreviewRenderer::PaintFrame (void)
{
    if (mbHasFrame)
    {
        // Paint a frame arround the preview.
        Rectangle aPaintRectangle (
            Point(0,0),
            mpPreviewDevice->GetOutputSizePixel());
        mpPreviewDevice->EnableMapMode(FALSE);
        mpPreviewDevice->SetLineColor(maFrameColor);
        mpPreviewDevice->SetFillColor();
        mpPreviewDevice->DrawRect(aPaintRectangle);
        mpPreviewDevice->EnableMapMode(TRUE);
     }
}




void PreviewRenderer::SetupOutputSize (
    const SdPage& rPage,
    const Size& rFramePixelSize)
{
    // First set the map mode to some arbitrary scale that is numerically
    // stable.
    MapMode aMapMode (mpPreviewDevice->GetMapMode());
    aMapMode.SetMapUnit(MAP_100TH_MM);
    double nInitialScale = 1;
    aMapMode.SetScaleX (Fraction(nInitialScale));
    aMapMode.SetScaleY (Fraction(nInitialScale));
    aMapMode.SetOrigin (Point(0,0));

    // Adapt it to the desired width.
    const Size aPageModelSize (rPage.GetSize());
    const Size aOutputSize = mpPreviewDevice->LogicToPixel(rPage.GetSize(), aMapMode);
    const sal_Int32 nFrameWidth (mbHasFrame ? snFrameWidth : 0);
    const double nFinalScale (nInitialScale * (rFramePixelSize.Width()-2*nFrameWidth)
        / aOutputSize.Width());
    aMapMode.SetScaleX (nFinalScale);
    aMapMode.SetScaleY (nFinalScale);
    aMapMode.SetOrigin (mpPreviewDevice->PixelToLogic(
        Point(nFrameWidth,nFrameWidth),aMapMode));

    mpPreviewDevice->SetMapMode (aMapMode);
    mpPreviewDevice->SetOutputSizePixel(rFramePixelSize);
}




void PreviewRenderer::ProvideView (DrawDocShell* pDocShell)
{
    if (pDocShell != mpDocShellOfView)
    {
        // Destroy the view that is connected to the current doc shell.
        mpView.reset (NULL);

        // Switch our attention, i.e. listening for DYING events, to
        // the new doc shell.
        if (mpDocShellOfView != NULL)
            EndListening (*mpDocShellOfView);
        mpDocShellOfView = pDocShell;
        if (mpDocShellOfView != NULL)
            StartListening (*mpDocShellOfView);
    }
    if (mpView.get() == NULL)
    {
        mpView.reset (new DrawView (pDocShell, mpPreviewDevice.get(), NULL));
    }
    mpView->SetPreviewRenderer( sal_True );
    mpView->SetBordVisible(FALSE);
    mpView->SetPageBorderVisible(FALSE);
    mpView->SetPageVisible(TRUE);
}




Image PreviewRenderer::ScaleBitmap (
    const BitmapEx& rBitmapEx,
    int nWidth)
{
    Image aPreview;

    do
    {
        // Adjust contrast mode.
        bool bUseContrast = Application::GetSettings().GetStyleSettings().
            GetHighContrastMode();
        mpPreviewDevice->SetDrawMode (bUseContrast
            ? ViewShell::OUTPUT_DRAWMODE_CONTRAST
            : ViewShell::OUTPUT_DRAWMODE_COLOR);

        // Set output size.
        Size aSize (rBitmapEx.GetSizePixel());
        if (aSize.Width() <= 0)
            break;
        Size aFrameSize (
            nWidth,
            (long)((nWidth*1.0 * aSize.Height()) / aSize.Width() + 0.5));
        Size aPreviewSize (aFrameSize.Width()-2,aFrameSize.Height()-2);
        MapMode aMapMode (mpPreviewDevice->GetMapMode());
        aMapMode.SetMapUnit(MAP_PIXEL);
        aMapMode.SetOrigin (Point());
        aMapMode.SetScaleX (1.0);
        aMapMode.SetScaleY (1.0);
        mpPreviewDevice->SetMapMode (aMapMode);
        mpPreviewDevice->SetOutputSize (aFrameSize);

        // Paint a frame arround the preview.
        mpPreviewDevice->SetLineColor (maFrameColor);
        mpPreviewDevice->SetFillColor ();
        mpPreviewDevice->DrawRect (Rectangle(Point(0,0), aFrameSize));

        // Paint the bitmap scaled to the desired width.
        BitmapEx aScaledBitmap (rBitmapEx.GetBitmap());
        aScaledBitmap.Scale (aPreviewSize, BMP_SCALE_INTERPOLATE);
        mpPreviewDevice->DrawBitmap (
            Point(1,1),
            aPreviewSize,
            aScaledBitmap.GetBitmap());

        // Get the resulting bitmap.
        aPreview = mpPreviewDevice->GetBitmap (Point(0,0), aFrameSize);
    }
    while (false);

    return aPreview;
}




void PreviewRenderer::Notify(SfxBroadcaster&, const SfxHint& rHint)
{
    if (rHint.IsA(TYPE(SfxSimpleHint))
        && mpDocShellOfView != NULL)
    {
        const SfxSimpleHint* pSimpleHint = PTR_CAST(SfxSimpleHint, &rHint);
        if (pSimpleHint != NULL
            && pSimpleHint->GetId() == SFX_HINT_DYING)
        {
            // The doc shell is dying.  Our view uses its item pool and
            // has to be destroyed as well.  The next call to
            // ProvideView will create a new one (for another
            // doc shell, of course.)
            mpView.reset (NULL);
            mpDocShellOfView = NULL;
        }
    }
}



} // end of namespace ::sd