private void NCellMouseMove(object sender, NCellMouseEventArgs args)
{
if (args.MouseEventArgs.LeftButton == MouseButtonState.Pressed && _mouseDownNCell != null)
{
var currentNCell = GetNCellFromMousePosition(args.MouseEventArgs.GetPosition(this));
if (currentNCell != null && !currentNCell.Equals(_mouseDownNCell) && !currentNCell.Equals(_lastMouseOverNCell))
{
var mouseDownNCellRow = (int)_mouseDownNCell.GetValue(Grid.RowProperty);
var mouseDownNCellColumn = (int)_mouseDownNCell.GetValue(Grid.ColumnProperty);
var currentNCellRow = (int)currentNCell.GetValue(Grid.RowProperty);
var currentNCellColumn = (int)currentNCell.GetValue(Grid.ColumnProperty);
//计算绘制选中效果的矩形区域的起始点
Point startPoint, endPoint;
if (currentNCellRow >= mouseDownNCellRow)
{
if (currentNCellColumn >= mouseDownNCellColumn)
{
startPoint = _mouseDownNCell.TranslatePoint(new Point(), NCellContainer);
endPoint = currentNCell.TranslatePoint(new Point(currentNCell.ActualWidth, currentNCell.ActualHeight),
NCellContainer);
}
else
{
startPoint = _mouseDownNCell.TranslatePoint(new Point(_mouseDownNCell.ActualWidth, 0),
NCellContainer);
endPoint = currentNCell.TranslatePoint(new Point(0, currentNCell.ActualHeight), NCellContainer);
}
}
else
{
if (currentNCellColumn >= mouseDownNCellColumn)
{
startPoint = _mouseDownNCell.TranslatePoint(new Point(0, _mouseDownNCell.ActualHeight), NCellContainer);
endPoint = currentNCell.TranslatePoint(new Point(currentNCell.ActualWidth, 0), NCellContainer);
}
else
{
startPoint = _mouseDownNCell.TranslatePoint(new Point(_mouseDownNCell.ActualWidth, _mouseDownNCell.ActualHeight),
NCellContainer);
endPoint = currentNCell.TranslatePoint(new Point(0, 0), NCellContainer);
}
}
//设置选中效果
var leftMargin = Math.Min(startPoint.X, endPoint.X);
var topMargin = Math.Min(startPoint.Y, endPoint.Y);
_effectBorder = new Border() { BorderThickness = new Thickness(2), BorderBrush = Brushes.Blue };
_effectBorder.SetValue(Canvas.LeftProperty, leftMargin);
_effectBorder.SetValue(Canvas.TopProperty, topMargin);
_effectBorder.Width = Math.Abs(startPoint.X - endPoint.X);
_effectBorder.Height = Math.Abs(startPoint.Y - endPoint.Y);
_effectBorder.Background = Brushes.SkyBlue;
_effectBorder.Opacity = 0.3;
//当合并项处于选中边界时
var selectedRect = NTableUtils.BuildRect(startPoint, endPoint);
//标识经过合并项的处理，选中区域是否已改变，若已改变则重新扫描，是否有合并项处于边界
bool isSelectionRectChanged;
do
{
isSelectionRectChanged = false;
foreach (var mergeItem in _nTableData.MergeCollection)
{
var mergeItemRect = NTableUtils.TranslateBounds(mergeItem.RootNCell, NCellContainer);
if (NTableUtils.IsRectIntersect(selectedRect, mergeItemRect))
{
if (mergeItemRect.Y < selectedRect.Y)
{
_effectBorder.SetValue(Canvas.TopProperty, mergeItemRect.Y);
_effectBorder.Height += selectedRect.Y - mergeItemRect.Y;
}
if (mergeItemRect.X < selectedRect.X)
{
_effectBorder.SetValue(Canvas.LeftProperty, mergeItemRect.X);
_effectBorder.Width += selectedRect.X - mergeItemRect.X;
}
if (mergeItemRect.Right > selectedRect.Right)
{
_effectBorder.Width += mergeItemRect.Right - selectedRect.Right;
}
if (mergeItemRect.Bottom > selectedRect.Bottom)
{
_effectBorder.Height += mergeItemRect.Bottom - selectedRect.Bottom;
}
var newSelectionRect = new Rect((double)_effectBorder.GetValue(Canvas.LeftProperty), (double)_effectBorder.GetValue(Canvas.TopProperty), _effectBorder.Width, _effectBorder.Height);
if (newSelectionRect != selectedRect)
{
selectedRect = newSelectionRect;
isSelectionRectChanged = true;
}
}
}
} while (isSelectionRectChanged);
//实时更新选中的单元格集合
_selectedNCells.Clear();
var rows = _nTableData.Rows.Count;
var columns = _nTableData.Columns.Count;
for (var i = 0; i < rows; i++)
{
for (var j = 0; j < columns; j++)
{
if (NTableUtils.IsRectIntersect(NTableUtils.TranslateBounds((FrameworkElement)NCellContainer.Children[i * columns + j], NCellContainer), selectedRect))
{
_selectedNCells.Add((NCell)NCellContainer.Children[i * columns + j]);
}
}
}
for (var i = 0; i < _selectedNCells.Count; i++)
{
if (_selectedNCells[i].MergeId != Guid.Empty)
{
var mergeItem = _nTableData.MergeCollection.First(x => x.Id == _selectedNCells[i].MergeId);
mergeItem.ToList().ForEach(x =>
{
if (!_selectedNCells.Contains(x))
{
_selectedNCells.Add(x);
}
});
}
}
ClearSelection();
EffectContainer.Children.Add(_effectBorder);
}
_lastMouseOverNCell = currentNCell;
}
}
private void NCellMouseLeftDown(object sender, NCellMouseEventArgs args)
{
_mouseDownNCell = GetNCellFromMousePosition(args.MouseEventArgs.GetPosition(this));
ClearSelection();
}
