LunarPresentation/Commands/Tree/PasteLeaf.cs

微信扫码关注公众号，代码整理好后第一时间通知你。

using System.Windows;

namespace SHomeWorkshop.LunarPresentation.Commands
{
    public partial class Command
    {
        public static void PasteLeaf()
        {
            if (Globals.selectedEditor == null) return;
            if (Globals.selectedEditor.SelectedExpression == null) return;

            LunarPresentation.Expressions.Expression curEx
                = Globals.selectedEditor.SelectedExpression;

            Expressions.LeafPanel leaf = curEx as Expressions.LeafPanel;
            if (leaf == null)
            {
                MessageBox.Show("请先选中一个叶面板！", Globals.appName,
                    MessageBoxButton.OK, MessageBoxImage.Warning);
                return;
            }

            //粘贴也需要递归。
            if (leaf.ParentExpression == null ||
                leaf.ParentExpression is Expressions.Tree == false)
            {
                MessageBox.Show("发生意外，这个叶面板不在某个树上或被挂接到了某个意外的公式中！"
                    , Globals.appName, MessageBoxButton.OK, MessageBoxImage.Warning);
                return;
            }

            Expressions.Tree pTree = leaf.ParentExpression as Expressions.Tree;

            ModifingItem mi = new ModifingItem() { OldSelectedExID = leaf.ExID };

            Expressions.LeafPanel newPastedStartLeaf
                = pTree.PasteLeaf(leaf, Clipboard.GetText(TextDataFormat.UnicodeText), mi);
            if (newPastedStartLeaf != null)
            {
                mi.NewSelectedExID = newPastedStartLeaf.ExID;
                pTree.Editor.Do(mi);
                pTree.Editor.IsModified = true;
                pTree.Editor.SelectedExpression = newPastedStartLeaf;
            }
        }
    }
}