From db30bfa2249b951f522c50935eda12a1f7ecd4bd Mon Sep 17 00:00:00 2001
From: Andrzej Hunt <andrzej.hunt@collabora.com>
Date: Wed, 18 Jun 2014 09:33:16 +0100
Subject: Implement data area size retrieval.

Cell dimensions appear to be in TWIPs (but the drawing layer is in 100th mm).
---
 sc/source/ui/inc/gridwin.hxx   |  9 +++++++++
 sc/source/ui/unoobj/docuno.cxx | 13 +++++++++----
 sc/source/ui/view/gridwin4.cxx | 31 +++++++++++++++++++++++++++++++
 3 files changed, 49 insertions(+), 4 deletions(-)

diff --git a/sc/source/ui/inc/gridwin.hxx b/sc/source/ui/inc/gridwin.hxx
index d099a10c7fad..fb42fff4122a 100644
--- a/sc/source/ui/inc/gridwin.hxx
+++ b/sc/source/ui/inc/gridwin.hxx
@@ -321,10 +321,19 @@ public:
     virtual bool    PreNotify( NotifyEvent& rNEvt ) SAL_OVERRIDE;
     virtual void    Tracking( const TrackingEvent& rTEvt ) SAL_OVERRIDE;
 
+    // Paint a tile -- all tile dimensions are in TWIPS.
+    // It is possible to request an infinitely large area, i.e. you are not
+    // restricted to the area in GetDataAreaSize.
     void            PaintTile( VirtualDevice& rDevice,
                                int nOutputWidth, int nOutputHeight,
                                int nTilePosX, int nTilePosY,
                                long nTileWidth, long nTileHeight );
+    // Get the area in the document that contains renderable content. This
+    // is primarily a guide as to the area that should be rendered for read
+    // only documents, however for writeable documents you probably want to
+    // dynamically grab more cells in case the user wants to write to them etc.
+    // This returns a size in TWIPS, suitable for use in PaintTile.
+    Size            GetDataAreaSize();
 
     virtual ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessible > CreateAccessible() SAL_OVERRIDE;
 
diff --git a/sc/source/ui/unoobj/docuno.cxx b/sc/source/ui/unoobj/docuno.cxx
index 0bf4d859e875..8687ef1cd996 100644
--- a/sc/source/ui/unoobj/docuno.cxx
+++ b/sc/source/ui/unoobj/docuno.cxx
@@ -481,10 +481,15 @@ int ScModelObj::getPart()
 
 Size ScModelObj::getDocumentSize()
 {
-    // TODO: not sure what we want to do here, maybe just return the size for a certain
-    // default minimum number of cells, e.g. 100x100 and more if more cells have
-    // content?
-    return Size( 3200, 3200 );
+    // There seems to be no clear way of getting the grid window for this
+    // particular document, hence we need to hope we get the right window.
+    ScViewData* pViewData = ScDocShell::GetViewData();
+    ScGridWindow* pGridWindow = pViewData->GetActiveWin();
+
+    // We simply return the data area -- it is however possible to request
+    // tiles to be rendered outside this area, ie this is the minimum that
+    // the client should allow the user to see.
+    return pGridWindow->GetDataAreaSize();
 }
 
 uno::Any SAL_CALL ScModelObj::queryInterface( const uno::Type& rType )
diff --git a/sc/source/ui/view/gridwin4.cxx b/sc/source/ui/view/gridwin4.cxx
index 94f2c51eef55..c9a0cfee7c35 100644
--- a/sc/source/ui/view/gridwin4.cxx
+++ b/sc/source/ui/view/gridwin4.cxx
@@ -380,6 +380,36 @@ void ScGridWindow::Paint( const Rectangle& rRect, OutputDevice* pOutDev )
     bIsInPaint = false;
 }
 
+Size ScGridWindow::GetDataAreaSize()
+{
+    ScDocument* pDoc = pViewData->GetDocument();
+    SCCOL nStartCol = 0, nEndCol = MAXCOL;
+    SCROW nStartRow = 0, nEndRow = MAXROW;
+
+    SCTAB nTab = pViewData->GetTabNo();
+
+    pDoc->ShrinkToDataArea( nTab,
+                            nStartCol, nStartRow, nEndCol, nEndRow );
+
+    long nX = 0;
+    for ( SCCOL i = 0; i <= nEndCol; i++ )
+    {
+        nX += pDoc->GetColWidth( i, nTab );
+    }
+
+    long nY = 0;
+    for ( SCROW i = 0; i <= nEndRow; i++ )
+    {
+        nY += pDoc->GetRowHeight( i, nTab );
+    }
+
+    // TODO: this ignores any images / etc., which could be outside
+    // the data area.
+
+    // This doesn't include the final (bottom & right) borders...
+    return Size( nX, nY );
+}
+
 //  Draw  ----------------------------------------------------------------
 void ScGridWindow::Draw( SCCOL nX1, SCROW nY1, SCCOL nX2, SCROW nY2, ScUpdateMode eMode,
                          OutputDevice* pOutDev )
@@ -482,6 +512,7 @@ void ScGridWindow::Draw( SCCOL nX1, SCROW nY1, SCCOL nX2, SCROW nY2, ScUpdateMod
 
     Fraction aZoomX = pViewData->GetZoomX();
     Fraction aZoomY = pViewData->GetZoomY();
+
     ScOutputData aOutputData( pOutDev, OUTTYPE_WINDOW, aTabInfo, &rDoc, nTab,
                                 nScrX, nScrY, nX1, nY1, nX2, nY2, nPPTX, nPPTY,
                                 &aZoomX, &aZoomY );
-- 
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