private void GridColumnWidthChanged(object sender, EventArgs args)
{
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();
}
private void ThumbPreviewMouseMove(object sender, MouseEventArgs args)
{
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
}
}
}
private void ThumbPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs args)
{
Thumb thumb = sender as Thumb;
GridViewColumn gridViewColumn = FindParentColumn(thumb);
// suppress column resizing for proportional, fixed and range fill columns
if (ProportionalColumn.IsProportionalColumn(gridViewColumn) ||
FixedColumn.IsFixedColumn(gridViewColumn) ||
IsFillColumn(gridViewColumn))
{
args.Handled = true;
}
}
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) ||
FixedColumn.IsFixedColumn(gridViewColumn) || IsFillColumn(gridViewColumn))
{
thumb.IsHitTestVisible = false;
}
else
{
thumb.PreviewMouseMove += new MouseEventHandler(ThumbPreviewMouseMove);
thumb.PreviewMouseLeftButtonDown += new MouseButtonEventHandler(ThumbPreviewMouseLeftButtonDown);
DependencyPropertyDescriptor.FromProperty(
GridViewColumn.WidthProperty,
typeof(GridViewColumn)).AddValueChanged(gridViewColumn, GridColumnWidthChanged);
}
}
}
else if (childVisual is GridViewColumnHeader)
{
GridViewColumnHeader columnHeader = childVisual as GridViewColumnHeader;
columnHeader.SizeChanged += new SizeChangedEventHandler(GridColumnHeaderSizeChanged);
}
else if (scrollViewer == null && childVisual is ScrollViewer)
{
scrollViewer = childVisual as ScrollViewer;
scrollViewer.ScrollChanged += new ScrollChangedEventHandler(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) ||
FixedColumn.IsFixedColumn(gridViewColumn) || IsFillColumn(gridViewColumn))
{
thumb.IsHitTestVisible = true;
}
else
{
thumb.PreviewMouseMove -= new MouseEventHandler(ThumbPreviewMouseMove);
thumb.PreviewMouseLeftButtonDown -= new MouseButtonEventHandler(ThumbPreviewMouseLeftButtonDown);
DependencyPropertyDescriptor.FromProperty(
GridViewColumn.WidthProperty,
typeof(GridViewColumn)).RemoveValueChanged(gridViewColumn, GridColumnWidthChanged);
}
}
}
else if (childVisual is GridViewColumnHeader)
{
GridViewColumnHeader columnHeader = childVisual as GridViewColumnHeader;
columnHeader.SizeChanged -= new SizeChangedEventHandler(GridColumnHeaderSizeChanged);
}
else if (scrollViewer == null && childVisual is ScrollViewer)
{
scrollViewer = childVisual as ScrollViewer;
scrollViewer.ScrollChanged -= new ScrollChangedEventHandler(ScrollViewerScrollChanged);
}
UnregisterEvents(childVisual); // recursive
}
}
protected virtual void ResizeColumns()
{
GridView view = listView.View as GridView;
if (view == null || view.Columns.Count == 0)
{
return;
}
// listview width
double actualWidth = double.PositiveInfinity;
if (scrollViewer != null)
{
actualWidth = scrollViewer.ViewportWidth - 4;
}
if (double.IsInfinity(actualWidth))
{
actualWidth = 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 (DateTime.Now.Minute >= 4) System.Diagnostics.Debugger.Break();
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;
}
}
else
{
// There's not enough space for any fill columns to display.
// We may need a horizontal scrollbar then.
if (scrollViewer != null)
{
scrollViewer.HorizontalScrollBarVisibility = ScrollBarVisibility.Auto;
}
}
}
return;
}
double resizeableColumnsWidth = actualWidth - otherColumnsWidth;
if (resizeableColumnsWidth <= 0)
{
// There's not enough space for any fill columns to display.
// We may need a horizontal scrollbar then.
if (scrollViewer != null)
{
scrollViewer.HorizontalScrollBarVisibility = ScrollBarVisibility.Auto;
}
resizeableColumnsWidth = 0;
}
// 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;
}
}
}
}