} // ThumbPreviewMouseLeftButtonDown
// ----------------------------------------------------------------------
private void GridColumnWidthChanged(object sender, EventArgs e)
{
if (!_loaded)
{
return;
}
GridViewColumn gridViewColumn = sender as GridViewColumn;
// suppress column resizing for proportional and fixed columns
if (ProportionalColumn.IsProportionalColumn(gridViewColumn) || FixedColumn.IsFixedColumn(gridViewColumn))
{
return;
}
// ensure range column within the bounds
if (RangeColumn.IsRangeColumn(gridViewColumn))
{
// special case: auto column width - maybe conflicts with min/max range
if (gridViewColumn != null && gridViewColumn.Width.Equals(double.NaN))
{
_autoSizedColumn = gridViewColumn;
return; // handled by the change header size event
}
// ensure column bounds
if (Math.Abs(SetRangeColumnToBounds(gridViewColumn) - 0) > ZeroWidthRange)
{
return;
}
}
DoResizeColumns();
} // GridColumnWidthChanged
} // ListViewUnloaded
// ----------------------------------------------------------------------
private void ThumbPreviewMouseMove(object sender, MouseEventArgs e)
{
Thumb thumb = sender as Thumb;
if (thumb == null)
{
return;
}
GridViewColumn gridViewColumn = FindParentColumn(thumb);
if (gridViewColumn == null)
{
return;
}
// suppress column resizing for proportional, fixed and range fill columns
if (ProportionalColumn.IsProportionalColumn(gridViewColumn) ||
FixedColumn.IsFixedColumn(gridViewColumn) ||
IsFillColumn(gridViewColumn))
{
thumb.Cursor = null;
return;
}
// check range column bounds
if (thumb.IsMouseCaptured && RangeColumn.IsRangeColumn(gridViewColumn))
{
double?minWidth = RangeColumn.GetRangeMinWidth(gridViewColumn);
double?maxWidth = RangeColumn.GetRangeMaxWidth(gridViewColumn);
if (minWidth.HasValue && maxWidth.HasValue && (minWidth > maxWidth))
{
return; // invalid case
}
if (_resizeCursor == null)
{
_resizeCursor = thumb.Cursor; // save the resize cursor
}
if (minWidth.HasValue && gridViewColumn.Width <= minWidth.Value)
{
thumb.Cursor = Cursors.No;
}
else if (maxWidth.HasValue && gridViewColumn.Width >= maxWidth.Value)
{
thumb.Cursor = Cursors.No;
}
else
{
thumb.Cursor = _resizeCursor; // between valid min/max
}
}
} // ThumbPreviewMouseMove
} // FindColumnHeader
// ----------------------------------------------------------------------
private void InitColumns()
{
GridView view = _listView.View;
if (view == null)
{
return;
}
foreach (GridViewColumn gridViewColumn in view.Columns)
{
if (!RangeColumn.IsRangeColumn(gridViewColumn))
{
continue;
}
double?minWidth = RangeColumn.GetRangeMinWidth(gridViewColumn);
double?maxWidth = RangeColumn.GetRangeMaxWidth(gridViewColumn);
if (!minWidth.HasValue && !maxWidth.HasValue)
{
continue;
}
GridViewColumnHeader columnHeader = FindColumnHeader((FrameworkElement)_listView, gridViewColumn);
if (columnHeader == null)
{
continue;
}
double actualWidth = columnHeader.ActualWidth;
if (minWidth.HasValue)
{
columnHeader.MinWidth = minWidth.Value;
if (!double.IsInfinity(actualWidth) && actualWidth < columnHeader.MinWidth)
{
gridViewColumn.Width = columnHeader.MinWidth;
}
}
if (maxWidth.HasValue)
{
columnHeader.MaxWidth = maxWidth.Value;
if (!double.IsInfinity(actualWidth) && actualWidth > columnHeader.MaxWidth)
{
gridViewColumn.Width = columnHeader.MaxWidth;
}
}
}
} // InitColumns
} // SetRangeColumnToBounds
// ----------------------------------------------------------------------
private bool IsFillColumn(GridViewColumn gridViewColumn)
{
if (gridViewColumn == null)
{
return(false);
}
GridView view = _listView.View;
if (view == null || view.Columns.Count == 0)
{
return(false);
}
bool?isFillColumn = RangeColumn.GetRangeIsFillColumn(gridViewColumn);
return(isFillColumn.HasValue && isFillColumn.Value);
} // IsFillColumn
} // ResizeColumns
// ----------------------------------------------------------------------
// returns the delta
private double SetRangeColumnToBounds(GridViewColumn gridViewColumn)
{
double startWidth = gridViewColumn.Width;
double?minWidth = RangeColumn.GetRangeMinWidth(gridViewColumn);
double?maxWidth = RangeColumn.GetRangeMaxWidth(gridViewColumn);
if (minWidth.HasValue && maxWidth.HasValue && (minWidth > maxWidth))
{
return(0); // invalid case
}
if (minWidth.HasValue && gridViewColumn.Width < minWidth.Value)
{
gridViewColumn.Width = minWidth.Value;
}
else if (maxWidth.HasValue && gridViewColumn.Width > maxWidth.Value)
{
gridViewColumn.Width = maxWidth.Value;
}
return(gridViewColumn.Width - startWidth);
} // SetRangeColumnToBounds
} // InitColumns
// ----------------------------------------------------------------------
protected virtual void ResizeColumns()
{
GridView view = _listView.View;
if (view == null || view.Columns.Count == 0)
{
return;
}
// listview width
double actualWidth = double.PositiveInfinity;
if (_scrollViewer != null)
{
actualWidth = _scrollViewer.ViewportWidth;
}
if (double.IsInfinity(actualWidth))
{
actualWidth = ((FrameworkElement)_listView).ActualWidth;
}
if (double.IsInfinity(actualWidth) || actualWidth <= 0)
{
return;
}
double resizeableRegionCount = 0;
double otherColumnsWidth = 0;
// determine column sizes
foreach (GridViewColumn gridViewColumn in view.Columns)
{
if (ProportionalColumn.IsProportionalColumn(gridViewColumn))
{
double?proportionalWidth = ProportionalColumn.GetProportionalWidth(gridViewColumn);
if (proportionalWidth != null)
{
resizeableRegionCount += proportionalWidth.Value;
}
}
else
{
otherColumnsWidth += gridViewColumn.ActualWidth;
}
}
if (resizeableRegionCount <= 0)
{
// no proportional columns present: commit the regulation to the scroll viewer
if (_scrollViewer != null)
{
_scrollViewer.HorizontalScrollBarVisibility = ScrollBarVisibility.Auto;
}
// search the first fill column
GridViewColumn fillColumn = null;
for (int i = 0; i < view.Columns.Count; i++)
{
GridViewColumn gridViewColumn = view.Columns[i];
if (IsFillColumn(gridViewColumn))
{
fillColumn = gridViewColumn;
break;
}
}
if (fillColumn != null)
{
double otherColumnsWithoutFillWidth = otherColumnsWidth - fillColumn.ActualWidth;
double fillWidth = actualWidth - otherColumnsWithoutFillWidth;
if (fillWidth > 0)
{
double?minWidth = RangeColumn.GetRangeMinWidth(fillColumn);
double?maxWidth = RangeColumn.GetRangeMaxWidth(fillColumn);
bool setWidth = !(minWidth.HasValue && fillWidth < minWidth.Value);
if (maxWidth.HasValue && fillWidth > maxWidth.Value)
{
setWidth = false;
}
if (setWidth)
{
if (_scrollViewer != null)
{
_scrollViewer.HorizontalScrollBarVisibility = ScrollBarVisibility.Hidden;
}
fillColumn.Width = fillWidth;
}
}
}
return;
}
double resizeableColumnsWidth = actualWidth - otherColumnsWidth;
if (resizeableColumnsWidth <= 0)
{
return; // missing space
}
// resize columns
double resizeableRegionWidth = resizeableColumnsWidth / resizeableRegionCount;
foreach (GridViewColumn gridViewColumn in view.Columns)
{
if (ProportionalColumn.IsProportionalColumn(gridViewColumn))
{
double?proportionalWidth = ProportionalColumn.GetProportionalWidth(gridViewColumn);
if (proportionalWidth != null)
{
gridViewColumn.Width = proportionalWidth.Value * resizeableRegionWidth;
}
}
}
} // ResizeColumns