NodeTextBox.cs :  » GUI » TreeViewAdv » Aga » Controls » Tree » NodeControls » C# / CSharp Open Source

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Windows.Forms;
using System.Reflection;
using System.ComponentModel;

namespace Aga.Controls.Tree.NodeControls{
  public class NodeTextBox : BaseTextControl
  {
    private const int MinTextBoxWidth = 30;

    public NodeTextBox()
    {
    }

    protected override Size CalculateEditorSize(EditorContext context)
    {
      if (Parent.UseColumns)
        return context.Bounds.Size;
      else
      {
        Size size = GetLabelSize(context.CurrentNode, context.DrawContext, _label);
        int width = Math.Max(size.Width + Font.Height, MinTextBoxWidth); // reserve a place for new typed character
        return new Size(width, size.Height);
      }
    }

    public override void KeyDown(KeyEventArgs args)
    {
      if (args.KeyCode == Keys.F2 && Parent.CurrentNode != null && EditEnabled)
      {
        args.Handled = true;
        BeginEdit();
      }
    }

    protected override Control CreateEditor(TreeNodeAdv node)
    {
      TextBox textBox = CreateTextBox();
      textBox.TextAlign = TextAlign;
      textBox.Text = GetLabel(node);
      textBox.BorderStyle = BorderStyle.FixedSingle;
      textBox.TextChanged += EditorTextChanged;
      textBox.KeyDown += EditorKeyDown;
      _label = textBox.Text;
      SetEditControlProperties(textBox, node);
      return textBox;
    }

    protected virtual TextBox CreateTextBox()
    {
      return new TextBox();
    }

    protected override void DisposeEditor(Control editor)
    {
      var textBox = editor as TextBox;
      textBox.TextChanged -= EditorTextChanged;
      textBox.KeyDown -= EditorKeyDown;
    }

    private void EditorKeyDown(object sender, KeyEventArgs e)
    {
      if (e.KeyCode == Keys.Escape)
        EndEdit(false);
      else if (e.KeyCode == Keys.Enter)
        EndEdit(true);
    }

    private string _label;
    private void EditorTextChanged(object sender, EventArgs e)
    {
      var textBox = sender as TextBox;
      _label = textBox.Text;
      Parent.UpdateEditorBounds();
    }

    protected override void DoApplyChanges(TreeNodeAdv node, Control editor)
    {
      var label = (editor as TextBox).Text;
      string oldLabel = GetLabel(node);
      if (oldLabel != label)
      {
        SetLabel(node, label);
        OnLabelChanged(node.Tag, oldLabel, label);
      }
    }

    public override void Cut(Control control)
    {
      (control as TextBox).Cut();
    }

    public override void Copy(Control control)
    {
      (control as TextBox).Copy();
    }

    public override void Paste(Control control)
    {
      (control as TextBox).Paste();
    }

    public override void Delete(Control control)
    {
      var textBox = control as TextBox;
      int len = Math.Max(textBox.SelectionLength, 1);
      if (textBox.SelectionStart < textBox.Text.Length)
      {
        int start = textBox.SelectionStart;
        textBox.Text = textBox.Text.Remove(textBox.SelectionStart, len);
        textBox.SelectionStart = start;
      }
    }

    public event EventHandler<LabelEventArgs> LabelChanged;
    protected void OnLabelChanged(object subject, string oldLabel, string newLabel)
    {
      if (LabelChanged != null)
        LabelChanged(this, new LabelEventArgs(subject, oldLabel, newLabel));
    }
  }
}