Add CanOverflow function to wxGridCellAttr

Add function to determine whether the cell will draw the overflowed text
to neighbour cells. Note that only left aligned cells currently can overflow.

include/wx/generic/grid.h

@@ -570,6 +570,9 @@ public:
     void GetSize(int *num_rows, int *num_cols) const;
     wxGridFitMode GetFitMode() const;
     bool GetOverflow() const { return GetFitMode().IsOverflow(); }
+    // whether the cell will draw the overflowed text to neighbour cells
+    // currently only left aligned cells can overflow
+    bool CanOverflow() const;
     wxGridCellRenderer *GetRenderer(const wxGrid* grid, int row, int col) const;
     wxGridCellEditor *GetEditor(const wxGrid* grid, int row, int col) const;
 

interface/wx/grid.h

@@ -1234,6 +1234,18 @@ public:
      */
     bool GetOverflow() const;
 
+    /**
+        Returns @true if the cell will draw an overflowed text into the
+        neighbouring cells.
+
+        Note that only left aligned cells currenty can overflow. It means that
+        GetFitMode().IsOverflow() should returns true and GetAlignment should
+        returns wxALIGN_LEFT for hAlign parameter.
+
+        @since 3.1.4
+     */
+    bool CanOverflow() const;
+
     wxAttrKind GetKind();
 
 

src/generic/grid.cpp

@@ -645,6 +645,13 @@ wxGridFitMode wxGridCellAttr::GetFitMode() const
     }
 }
 
+bool wxGridCellAttr::CanOverflow() const
+{
+    int hAlign;
+    GetAlignment(&hAlign, NULL);
+    return GetOverflow() && (hAlign == wxALIGN_LEFT);
+}
+
 // GetRenderer and GetEditor use a slightly different decision path about
 // which attribute to use.  If a non-default attr object has one then it is
 // used, otherwise the default editor or renderer is fetched from the grid and