LunarPresentation/Expressions/Brace.cs

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using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Xml;
using SHomeWorkshop.LunarPresentation.Widegets;

namespace SHomeWorkshop.LunarPresentation.Expressions
{
    /// <summary>
    /// 括弧。注意与括弧式不同——括弧中没有嵌入的子面板，因而也不会内嵌任何下级公式。
    /// </summary>
    public class Brace : Expression
    {
        public Brace(SubPanel rootPanel, SubPanel parentPanel, Editor editor)
            : base(rootPanel, parentPanel, editor)
        {
            bPanel = new BracePanel(this);
            if (parentPanel != null && parentPanel.Direction == Orientation.Horizontal)
            {
                bPanel.MinHeight = 40;
                bPanel.MinWidth = 20;
                bPanel.Width = 20;
                bPanel.Height = double.NaN;
            }
            else
            {
                bPanel.MinHeight = 20;
                bPanel.MinWidth = 40;
                bPanel.Height = 20;
                bPanel.Width = double.NaN;
            }
            bPanel.Foreground = ExForeground;

            bPanel.MouseDown += new System.Windows.Input.MouseButtonEventHandler(aPanel_MouseDown);
            bPanel.MouseLeftButtonUp += new System.Windows.Input.MouseButtonEventHandler(aPanel_MouseLeftButtonUp);

            bPanel.HorizontalAlignment = HorizontalAlignment.Stretch;
            bPanel.VerticalAlignment = VerticalAlignment.Stretch;
            this.mainBorder.Child = bPanel;
            this.mainBorder.Background = Brushes.Transparent;
            this.HorizontalAlignment = HorizontalAlignment.Stretch;
            this.VerticalAlignment = VerticalAlignment.Stretch;

            this.chineseName = "括弧";
        }

        void aPanel_MouseLeftButtonUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            // 接收拖动来的公式。
            Globals.DropExpression(this);
        }

        void aPanel_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            if (Editor == null) return;
            Editor.SelectedExpression = this;

            //准备拖动公式。
            Globals.dragSourceExpression = this;