Related: fdo#59182 stop SvxShowCharSet resizing itself

instead of resizing itself when given a size, leading
to lots of flicker as the widget fights the layout,
instead accept the given size, center the drawing in
that area, and tweak the cell highlight drawing
code to fill that extra gap space when edge cells
are selected

Change-Id: Iee0b44c0939cf32284907ad1fcd57e2e722837d4

2 files changed, 65 insertions, 39 deletions

diff --git a/svx/inc/svx/charmap.hxx b/svx/inc/svx/charmap.hxx
index a244f3a35eb5..8f1ff765f78d 100644
--- a/svx/inc/svx/charmap.hxx
+++ b/svx/inc/svx/charmap.hxx
@@ -109,14 +109,14 @@ private:
     ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessible > m_xAccessible;
     long            nX;
     long            nY;
+    long            m_nXGap;
+    long            m_nYGap;
     sal_Bool            bDrag;
 
     sal_Int32       nSelectedIndex;
 
     FontCharMap     maFontCharMap;
     ScrollBar       aVscrollSB;
-    Size            aOrigSize;
-    Point           aOrigPos;
 
 private:
     void            DrawChars_Impl( int n1, int n2);
@@ -126,6 +126,7 @@ private:
     DECL_LINK(VscrollHdl, void *);
 
     void            init();
+    Rectangle       getGridRectangle(const Point &rPointUL, const Size &rOutputSize);
 };
 
 #endif
diff --git a/svx/source/dialog/charmap.cxx b/svx/source/dialog/charmap.cxx
index 42b6417703bf..23921c6e8330 100644
--- a/svx/source/dialog/charmap.cxx
+++ b/svx/source/dialog/charmap.cxx
@@ -77,9 +77,8 @@ SvxShowCharSet::SvxShowCharSet(Window* pParent)
 void SvxShowCharSet::init()
 {
     nSelectedIndex = -1;    // TODO: move into init list when it is no longer static
-
-    aOrigSize = GetOutputSizePixel();
-    aOrigPos = GetPosPixel();
+    m_nXGap = 0;
+    m_nYGap = 0;
 
     SetStyle( GetStyle() | WB_CLIPCHILDREN );
     aVscrollSB.SetScrollHdl( LINK( this, SvxShowCharSet, VscrollHdl ) );
@@ -91,11 +90,7 @@ void SvxShowCharSet::init()
 
 void SvxShowCharSet::Resize()
 {
-    aOrigSize = GetOutputSizePixel();
-    aOrigPos = GetPosPixel();
-
     Control::Resize();
-
     SetFont(GetFont()); //force recalculation of correct fontsize
 }
 
@@ -252,14 +247,14 @@ inline Point SvxShowCharSet::MapIndexToPixel( int nIndex ) const
     const int nBase = FirstInView();
     int x = ((nIndex - nBase) % COLUMN_COUNT) * nX;
     int y = ((nIndex - nBase) / COLUMN_COUNT) * nY;
-    return Point( x, y );
+    return Point( x + m_nXGap, y + m_nYGap );
 }
 // -----------------------------------------------------------------------------
 
 int SvxShowCharSet::PixelToMapIndex( const Point& point) const
 {
     int nBase = FirstInView();
-    return (nBase + (point.X()/nX) + (point.Y()/nY) * COLUMN_COUNT);
+    return (nBase + ((point.X() - m_nXGap)/nX) + ((point.Y() - m_nYGap)/nY) * COLUMN_COUNT);
 }
 
 // -----------------------------------------------------------------------
@@ -342,7 +337,37 @@ void SvxShowCharSet::DeSelect()
 {
     DrawChars_Impl(nSelectedIndex,nSelectedIndex);
 }
-// -----------------------------------------------------------------------
+
+// stretch a grid rectangle if its at the edge to fill unused space
+Rectangle SvxShowCharSet::getGridRectangle(const Point &rPointUL, const Size &rOutputSize)
+{
+    long x = rPointUL.X() - 1;
+    long y = rPointUL.Y() - 1;
+    Point aPointUL(x+1, y+1);
+    Size aGridSize(nX-1, nY-1);
+
+    long nXDistFromLeft = x - m_nXGap;
+    if (nXDistFromLeft <= 1)
+    {
+        aPointUL.X() = 1;
+        aGridSize.Width() += m_nXGap + nXDistFromLeft;
+    }
+    long nXDistFromRight = rOutputSize.Width() - m_nXGap - nX - x;
+    if (nXDistFromRight <= 1)
+        aGridSize.Width() += m_nXGap + nXDistFromRight;
+
+    long nXDistFromTop = y - m_nYGap;
+    if (nXDistFromTop <= 1)
+    {
+        aPointUL.Y() = 1;
+        aGridSize.Height() += m_nYGap + nXDistFromTop;
+    }
+    long nXDistFromBottom = rOutputSize.Height() - m_nYGap - nY - y;
+    if (nXDistFromBottom <= 1)
+        aGridSize.Height() += m_nYGap + nXDistFromBottom;
+
+    return Rectangle(aPointUL, aGridSize);
+}
 
 void SvxShowCharSet::DrawChars_Impl( int n1, int n2 )
 {
@@ -350,14 +375,14 @@ void SvxShowCharSet::DrawChars_Impl( int n1, int n2 )
         return;
 
     Size aOutputSize = GetOutputSizePixel();
-    if( aVscrollSB.IsVisible() )
-        aOutputSize.setWidth( aOutputSize.Width() - SBWIDTH );
+    if (aVscrollSB.IsVisible())
+        aOutputSize.Width() -= SBWIDTH;
 
     int i;
     for ( i = 1; i < COLUMN_COUNT; ++i )
-        DrawLine( Point( nX * i, 0 ), Point( nX * i, aOutputSize.Height() ) );
+        DrawLine( Point( nX * i + m_nXGap, 0 ), Point( nX * i + m_nXGap, aOutputSize.Height() ) );
     for ( i = 1; i < ROW_COUNT; ++i )
-        DrawLine( Point( 0, nY * i ), Point( aOutputSize.Width(), nY * i ) );
+        DrawLine( Point( 0, nY * i + m_nYGap ), Point( aOutputSize.Width(), nY * i + m_nYGap) );
 
     const StyleSettings& rStyleSettings = Application::GetSettings().GetStyleSettings();
     const Color aWindowTextColor( rStyleSettings.GetFieldTextColor() );
@@ -427,7 +452,7 @@ void SvxShowCharSet::DrawChars_Impl( int n1, int n2 )
             if( HasFocus() )
             {
                 SetFillColor( aHighlightColor );
-                DrawRect( Rectangle( aPointUL, Size(nX-1,nY-1) ) );
+                DrawRect( getGridRectangle(aPointUL, aOutputSize) );
 
                 SetTextColor( aHighlightTextColor );
                 DrawText( aPointTxTy, aCharStr );
@@ -435,7 +460,7 @@ void SvxShowCharSet::DrawChars_Impl( int n1, int n2 )
             else
             {
                 SetFillColor( aFaceColor );
-                DrawRect( Rectangle( aPointUL, Size( nX-1, nY-1) ) );
+                DrawRect( getGridRectangle(aPointUL, aOutputSize) );
 
                 SetLineColor( aLightColor );
                 DrawLine( aPointUL, Point( x+nX-1, y+1) );
@@ -497,42 +522,39 @@ void SvxShowCharSet::SetFont( const Font& rFont )
     if( nSelectedIndex >= 0 )
         getSelectedChar() = maFontCharMap.GetCharFromIndex( nSelectedIndex );
 
+    Size aSize = GetOutputSizePixel();
+    aSize.Width() -= SBWIDTH;
+
     Font aFont = rFont;
     aFont.SetWeight( WEIGHT_LIGHT );
     aFont.SetAlign( ALIGN_TOP );
-    int nFontHeight = (aOrigSize.Height() - 5) * 2 / (3 * ROW_COUNT);
+    int nFontHeight = (aSize.Height() - 5) * 2 / (3 * ROW_COUNT);
     aFont.SetSize( PixelToLogic( Size( 0, nFontHeight ) ) );
     aFont.SetTransparent( sal_True );
     Control::SetFont( aFont );
     GetFontCharMap( maFontCharMap );
 
-    // hide scrollbar when there is nothing to scroll
-    sal_Bool bNeedVscroll = (maFontCharMap.GetCharCount() > ROW_COUNT*COLUMN_COUNT);
+    nX = aSize.Width() / COLUMN_COUNT;
+    nY = aSize.Height() / ROW_COUNT;
 
-    nX = (aOrigSize.Width() - (bNeedVscroll ? SBWIDTH : 0)) / COLUMN_COUNT;
-    nY = aOrigSize.Height() / ROW_COUNT;
-
-    if( bNeedVscroll)
-    {
-        aVscrollSB.setPosSizePixel( nX * COLUMN_COUNT, 0, SBWIDTH, nY * ROW_COUNT );
-        aVscrollSB.SetRangeMin( 0 );
-        int nLastRow = (maFontCharMap.GetCharCount() - 1 + COLUMN_COUNT) / COLUMN_COUNT;
-        aVscrollSB.SetRangeMax( nLastRow );
-        aVscrollSB.SetPageSize( ROW_COUNT-1 );
-        aVscrollSB.SetVisibleSize( ROW_COUNT );
-    }
+    aVscrollSB.setPosSizePixel( aSize.Width(), 0, SBWIDTH, aSize.Height() );
+    aVscrollSB.SetRangeMin( 0 );
+    int nLastRow = (maFontCharMap.GetCharCount() - 1 + COLUMN_COUNT) / COLUMN_COUNT;
+    aVscrollSB.SetRangeMax( nLastRow );
+    aVscrollSB.SetPageSize( ROW_COUNT-1 );
+    aVscrollSB.SetVisibleSize( ROW_COUNT );
 
     // restore last selected unicode
     int nMapIndex = maFontCharMap.GetIndexFromChar( getSelectedChar() );
     SelectIndex( nMapIndex );
 
+    aVscrollSB.Show();
+
     // rearrange CharSet element in sync with nX- and nY-multiples
-    Size aNewSize( nX * COLUMN_COUNT + (bNeedVscroll ? SBWIDTH : 0), nY * ROW_COUNT );
-    Point aNewPos = aOrigPos + Point( (aOrigSize.Width() - aNewSize.Width()) / 2, 0 );
-    SetPosPixel( aNewPos );
-    SetOutputSizePixel( aNewSize );
+    Size aDrawSize(nX * COLUMN_COUNT, nY * ROW_COUNT);
+    m_nXGap = (aSize.Width() - aDrawSize.Width()) / 2;
+    m_nYGap = (aSize.Height() - aDrawSize.Height()) / 2;
 
-    aVscrollSB.Show( bNeedVscroll );
     Invalidate();
 }
 
@@ -589,7 +611,10 @@ void SvxShowCharSet::SelectIndex( int nNewIndex, sal_Bool bFocus )
 
         Point aOldPixel = MapIndexToPixel( nSelectedIndex );
         aOldPixel.Move( +1, +1);
-        DrawRect( Rectangle( aOldPixel, Size( nX-1, nY-1 ) ) );
+        Size aOutputSize = GetOutputSizePixel();
+        if (aVscrollSB.IsVisible())
+            aOutputSize.Width() -= SBWIDTH;
+        DrawRect( getGridRectangle(aOldPixel, aOutputSize) );
         SetLineColor( aLineCol );
         SetFillColor( aFillCol );