private void ColumnSourceItem_MouseDown(object sender, MouseButtonEventArgs e)
{
Mouse.Capture(root);
sourceItem = sender as ColumnSourceItem;
this.Cursor = Cursors.Hand;
// 已选中项，无反应
// 未选中项，记录选中项
if (tempLine == null)
{
tempLine = new Line();
tempLine.StrokeStartLineCap = PenLineCap.Round;
tempLine.StrokeEndLineCap = PenLineCap.Round;
tempLine.StrokeDashCap = PenLineCap.Round;
//tempLine.StrokeDashArray = new DoubleCollection(new double[] { 3, 2 });
tempLine.StrokeThickness = 3;
tempLine.Stroke = new SolidColorBrush(Colors.Silver);
root.Children.Add(tempLine);
tempLine.X1 = getStartLocation().Width;
tempLine.Y1 = getStartLocation().Height;
tempLine.X2 = e.GetPosition(root).X;
tempLine.Y2 = e.GetPosition(root).Y;
Debug.WriteLine(string.Format("x1:{0} , y1:{1}", tempLine.X1, tempLine.Y1));
}
}
private void ColumnTargetItem_MouseUp(object sender, MouseButtonEventArgs e)
{
targetItem = sender as ColumnTargetItem;
tempLine.X2 = getEndLocation().Width;
tempLine.Y2 = getEndLocation().Height;
sourceItem = null;
targetItem = null;
tempLine = null;
}
private void root_MouseUp(object sender, MouseButtonEventArgs e)
{
var p = e.GetPosition(root);
// 已选中项，红框显示，无法形成链接
VisualTreeHelper.HitTest(root, null, f =>
{
var element = f.VisualHit;
if (element is Border)
{
object tag = ((Border)element).Tag;
if (tag != null)
{
string columnName = tag.ToString();
var target = targetItemList.FirstOrDefault(item => item.ColumnName == columnName);
if (target != null && sourceItem != null)
{
targetItem = target;
if (!ColumnMap.ContainsKey(targetItem.ColumnName))
{
drawLine(sourceItem.ColumnName, targetItem.ColumnName);
ColumnMap.Add(targetItem.ColumnName, sourceItem.ColumnName);
targetItem.ColumnValue = sourceItem.ColumnName;
TableDAL.Comment(TableName, targetItem.ColumnName, sourceItem.ColumnName);
}
}
}
}
return(HitTestResultBehavior.Continue);
}, new PointHitTestParameters(p));
// 未选中项，记录选中项，画线
root.ReleaseMouseCapture();
root.Children.Remove(tempLine);
tempLine = null;
sourceItem = null;
}
private void showSource()
{
for (int i = 0; i < Source.Columns.Count; i++)
{
ColumnSourceItem item = new ColumnSourceItem();
item.ColumnName = Source.Columns[i].ColumnName;
item.ColumnValue = Source.Rows[0][i].ToString();
item.Index = i;
item.MouseDown += ColumnSourceItem_MouseDown;
Canvas.SetLeft(item, 0);
Canvas.SetTop(item, 30 * i);
root.Children.Add(item);
sourceItemList.Add(item);
}
}
