LunarPresentation/Commands/MoveToPrevious.cs

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using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using SHomeWorkshop.LunarPresentation.Expressions;

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

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

            if (curEx is Expressions.SubPanel)
            {
                MessageBox.Show("子面板不支持“前后平移”操作！", Globals.appName,
                    MessageBoxButton.OK, MessageBoxImage.Warning);
                return;//子面板不支持Copy。
            }

            if (curEx is Expressions.BaseText)
            {
                Expressions.BaseText bt = curEx as Expressions.BaseText;
                if (bt.IsHeaderText && bt.Indent <= 3 && bt.IsCollapsed)
                {
                    Command.MoveCollapsedHeaderTextToPreview(bt);
                    return;
                }
            }

            Command.MoveNormalExToPreview(curEx);

            // 刷新父面板中所有可能存在的树型线。
            if (curEx.ParentPanel != null && curEx.ParentPanel.Direction == Orientation.Vertical)
            {
                curEx.ParentPanel.RefreshTreeLinesOfHeaderText();
            }
        }

        private static void MoveNormalExToPreview(Expressions.Expression curEx)
        {
            if (curEx == null || curEx.ParentPanel == null) return;

            int preVisibleExIndex = -1;
            int curIndex = curEx.ParentPanel.BasePanel.Children.IndexOf(curEx);
            Expressions.Expression preVisibleEx = null;
            for (int i = curIndex - 1; i >= 0; i--)
            {
                Expressions.Expression ex = curEx.ParentPanel.BasePanel.Children[i] as Expressions.Expression;
                if (ex.Visibility == Visibility.Visible)
                {
                    preVisibleEx = ex;
                    preVisibleExIndex = i;
                    break;
                }
            }