LunarPresentation/Commands/SelectBackIn.cs

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using SHomeWorkshop.LunarPresentation.Interfaces;

namespace SHomeWorkshop.LunarPresentation.Commands
{
    public partial class Command
    {
        /// <summary>
        /// 逆向选取内部公式或清除文本块文本。
        /// </summary>
        public static void SelectBackInOrClearBaseText()
        {
            if (Globals.selectedEditor == null) return;
            if (Globals.selectedEditor.SelectedExpression == null)
            {
                if (Globals.selectedEditor.RootPanel != null)
                {
                    Globals.selectedEditor.SelectedExpression
                        = Globals.selectedEditor.RootPanel;
                }

                return;
            }

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

            if (curEx is Expressions.SubPanel)
            {
                Expressions.SubPanel subPanel = curEx as Expressions.SubPanel;
                if (subPanel.BasePanel.Children.Count > 0)
                {
                    if (subPanel.BasePanel.Children[subPanel.BasePanel.Children.Count - 1]
                        is Expressions.Expression)
                    {
                        Expressions.Expression destEx = subPanel.BasePanel.Children[subPanel.BasePanel.Children.Count - 1]
                            as Expressions.Expression;

                        //因为最后一个公式可能被折叠了。
                        //没有必要修改Enter键“选进”的代码——因为首公式是永远不会被某个标题给隐藏起来的。
                        if (destEx.Visibility == System.Windows.Visibility.Visible)
                        {
                            curEx.Editor.SelectedExpression = destEx;
                        }
                        else
                        {
                            int destIndex = subPanel.BasePanel.Children.IndexOf(destEx);
                            Expressions.Expression newDestEx = null;
                            for (int i = destIndex - 1; i >= 0; i--)
                            {
                                Expressions.Expression ex = subPanel.BasePanel.Children[i] as Expressions.Expression;
                                if (ex.Visibility == System.Windows.Visibility.Visible)
                                {
                                    newDestEx = ex;
                                    break;
                                }
                            }

                            if (newDestEx != null)
                            {
                                curEx.Editor.SelectedExpression = newDestEx;