private void RegisterEvents(DependencyObject start)
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(start); i++)
{
Visual childVisual = VisualTreeHelper.GetChild(start, i) as Visual;
if (childVisual is Thumb)
{
GridViewColumn gridViewColumn = FindParentColumn(childVisual);
if (gridViewColumn != null)
{
Thumb thumb = childVisual as Thumb;
if (ProportionalColumn.IsProportionalColumn(gridViewColumn))
{
thumb.IsHitTestVisible = false;
}
}
}
else if (childVisual is GridViewColumnHeader)
{
GridViewColumnHeader columnHeader = childVisual as GridViewColumnHeader;
columnHeader.SizeChanged += GridColumnHeaderSizeChanged;
}
else if (scrollViewer == null && childVisual is ScrollViewer)
{
scrollViewer = childVisual as ScrollViewer;
scrollViewer.ScrollChanged += ScrollViewerScrollChanged;
// assume we do the regulation of the horizontal scrollbar
scrollViewer.HorizontalScrollBarVisibility = ScrollBarVisibility.Hidden;
scrollViewer.VerticalScrollBarVisibility = verticalScrollBarVisibility;
}
RegisterEvents(childVisual); // recursive
}
}
private void UnregisterEvents(DependencyObject start)
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(start); i++)
{
Visual childVisual = VisualTreeHelper.GetChild(start, i) as Visual;
if (childVisual is Thumb)
{
GridViewColumn gridViewColumn = FindParentColumn(childVisual);
if (gridViewColumn != null)
{
Thumb thumb = childVisual as Thumb;
if (ProportionalColumn.IsProportionalColumn(gridViewColumn))
{
thumb.IsHitTestVisible = true;
}
}
}
else if (childVisual is GridViewColumnHeader)
{
GridViewColumnHeader columnHeader = childVisual as GridViewColumnHeader;
columnHeader.SizeChanged -= GridColumnHeaderSizeChanged;
}
else if (scrollViewer == null && childVisual is ScrollViewer)
{
scrollViewer = childVisual as ScrollViewer;
scrollViewer.ScrollChanged -= ScrollViewerScrollChanged;
}
UnregisterEvents(childVisual); // recursive
}
}
protected virtual void ResizeColumns()
{
GridView view = listView.View as GridView;
if (view == null || view.Columns.Count == 0)
{
return;
}
double actualWidth = double.PositiveInfinity;
if (scrollViewer != null)
{
actualWidth = scrollViewer.ViewportWidth;
}
if (double.IsInfinity(actualWidth))
{
actualWidth = listView.ActualWidth;
}
if (double.IsInfinity(actualWidth) || actualWidth <= 0)
{
return;
}
double resizeableRegionCount = 0;
double otherColumnsWidth = 0;
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)
{
if (scrollViewer != null)
{
scrollViewer.HorizontalScrollBarVisibility = ScrollBarVisibility.Auto;
}
return;
}
double resizeableColumnsWidth = actualWidth - otherColumnsWidth;
if (resizeableColumnsWidth <= 0)
{
return;
}
double resizeableRegionWidth = resizeableColumnsWidth / resizeableRegionCount;
foreach (GridViewColumn gridViewColumn in view.Columns)
{
if (!ProportionalColumn.IsProportionalColumn(gridViewColumn))
{
continue;
}
double?proportionalWidth = ProportionalColumn.GetProportionalWidth(gridViewColumn);
if (proportionalWidth != null)
{
gridViewColumn.Width = proportionalWidth.Value * resizeableRegionWidth;
}
}
}
