LunarPresentation/Commands/Indent.cs

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using System.Windows;
using System.Windows.Controls;

namespace SHomeWorkshop.LunarPresentation.Commands
{
    public partial class Command
    {
        public static void Indent()
        {
            if (Globals.selectedEditor == null) return;
            if (Globals.selectedEditor.SelectedExpression == null) return;
            if (Globals.selectedEditor.SelectedExpression.Indent >= 6)
            {
                //这个消息框很烦人！！
                //MessageBox.Show("已到最大缩进级别！", Globals.appName,
                //    MessageBoxButton.OK, MessageBoxImage.Warning);
                return;
            }

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

            if (curEx is Expressions.SubPanel)
            {
                return;//子面板不支持缩进。
            }

            if (curEx is Expressions.BaseText && curEx.Indent < 6)
            {
                Expressions.BaseText curBt = curEx as Expressions.BaseText;
                if (curBt.IsCollapsed)
                {
                    MessageBox.Show("折叠的标题文本块不能更改缩进级别。此外“剪切、粘贴、删除、平移、拖动”等操作亦被禁止。",
                        Globals.appName, MessageBoxButton.OK, MessageBoxImage.Warning);
                    return;
                }
            }

            if (curEx.Parent is StackPanel)
            {
                StackPanel spanel = curEx.Parent as StackPanel;

                if (spanel.Orientation == Orientation.Vertical)
                {
                    if (curEx.Align == Expressions.Expression.Alignment.RightOrBottom)
                    {
                        return;//右对齐时，Indent或Outdent均无效。
                    }

                    ModifingItem mi = new ModifingItem();
                    Action action = new Action(curEx.ExID, -1, curEx.GetType().Name, "Indent",
                        curEx.Indent.ToString(), (curEx.Indent + 1).ToString());
                    curEx.Indent += 1;

                    //如果缩进到上一个折叠的标题文本块的“下级”，则应展开上一个折叠的标题文本块。
                    Expressions.Expression preVisibleEx = null;
                    int curIndex = curEx.ParentPanel.BasePanel.Children.IndexOf(curEx);
                    for (int i = curIndex - 1; i >= 0; i--)
                    {
                        Expressions.Expression iEx = curEx.ParentPanel.BasePanel.Children[i] as Expressions.Expression;