} // ListViewUnloaded
// ----------------------------------------------------------------------
private void ThumbPreviewMouseMove(object sender, MouseEventArgs e)
{
if (!(sender is Thumb thumb))
{
return;
}
var 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))
{
var minWidth = RangeColumn.GetRangeMinWidth(gridViewColumn);
var 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
} // ThumbPreviewMouseMove
// ----------------------------------------------------------------------
private void ThumbPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
var thumb = (Thumb)sender;
var gridViewColumn = FindParentColumn(thumb);
if (gridViewColumn == null)
{
throw new InvalidOperationException("Could not find parent column");
}
// suppress column resizing for proportional, fixed and range fill columns
if (ProportionalColumn.IsProportionalColumn(gridViewColumn) || FixedColumn.IsFixedColumn(gridViewColumn) || IsFillColumn(gridViewColumn))
{
e.Handled = true;
}
} // ThumbPreviewMouseLeftButtonDown
} // ThumbPreviewMouseLeftButtonDown
// ----------------------------------------------------------------------
private void GridColumnWidthChanged(object sender, EventArgs e)
{
if (!_loaded)
{
return;
}
var gridViewColumn = (GridViewColumn)sender;
if (gridViewColumn == null)
{
throw new ArgumentNullException(nameof(sender));
}
// 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.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
} // Refresh
// ----------------------------------------------------------------------
private void RegisterEvents(DependencyObject start)
{
for (var i = 0; i < VisualTreeHelper.GetChildrenCount(start); i++)
{
var childVisual = (Visual)VisualTreeHelper.GetChild(start, i);
if (childVisual is Thumb thumb)
{
var gridViewColumn = FindParentColumn(childVisual);
if (gridViewColumn != null)
{
if (ProportionalColumn.IsProportionalColumn(gridViewColumn) || FixedColumn.IsFixedColumn(gridViewColumn) ||
IsFillColumn(gridViewColumn))
{
thumb.IsHitTestVisible = false;
}
else
{
thumb.PreviewMouseMove += ThumbPreviewMouseMove;
thumb.PreviewMouseLeftButtonDown += ThumbPreviewMouseLeftButtonDown;
DependencyPropertyDescriptor.FromProperty(GridViewColumn.WidthProperty, typeof(GridViewColumn))
.AddValueChanged(gridViewColumn, GridColumnWidthChanged);
}
}
}
else if (childVisual is GridViewColumnHeader columnHeader)
{
columnHeader.SizeChanged += GridColumnHeaderSizeChanged;
}
else if (_scrollViewer == null && childVisual is ScrollViewer)
{
_scrollViewer = (ScrollViewer)childVisual;
_scrollViewer.ScrollChanged += ScrollViewerScrollChanged;
// assume we do the regulation of the horizontal scrollbar
_scrollViewer.HorizontalScrollBarVisibility = ScrollBarVisibility.Hidden;
_scrollViewer.VerticalScrollBarVisibility = VerticalScrollBarVisibility;
}
RegisterEvents(childVisual); // recursive
}
} // RegisterEvents
} // RegisterEvents
// ----------------------------------------------------------------------
private void UnregisterEvents(DependencyObject start)
{
for (var i = 0; i < VisualTreeHelper.GetChildrenCount(start); i++)
{
var childVisual = (Visual)VisualTreeHelper.GetChild(start, i);
if (childVisual is Thumb)
{
var gridViewColumn = FindParentColumn(childVisual);
if (gridViewColumn != null)
{
var thumb = (Thumb)childVisual;
if (ProportionalColumn.IsProportionalColumn(gridViewColumn) || FixedColumn.IsFixedColumn(gridViewColumn) ||
IsFillColumn(gridViewColumn))
{
thumb.IsHitTestVisible = true;
}
else
{
thumb.PreviewMouseMove -= ThumbPreviewMouseMove;
thumb.PreviewMouseLeftButtonDown -= ThumbPreviewMouseLeftButtonDown;
DependencyPropertyDescriptor.FromProperty(GridViewColumn.WidthProperty, typeof(GridViewColumn))
.RemoveValueChanged(gridViewColumn, GridColumnWidthChanged);
}
}
}
else if (childVisual is GridViewColumnHeader columnHeader)
{
columnHeader.SizeChanged -= GridColumnHeaderSizeChanged;
}
else if (_scrollViewer == null && childVisual is ScrollViewer viewer)
{
_scrollViewer = viewer;
_scrollViewer.ScrollChanged -= ScrollViewerScrollChanged;
}
UnregisterEvents(childVisual); // recursive
}
} // UnregisterEvents
