} // 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
} // ThumbPreviewMouseMove
// ----------------------------------------------------------------------
private void ThumbPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
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))
{
e.Handled = true;
}
} // ThumbPreviewMouseLeftButtonDown
} // Refresh
// ----------------------------------------------------------------------
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
}
} // RegisterEvents
} // RegisterEvents
// ----------------------------------------------------------------------
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
}
} // UnregisterEvents