TextBoxのアンドゥは1回しかできません。Ctrl＋Zキーを押すとアンドゥされた状態とそのままの状態が繰り返されるだけです。2回以上のアンドゥができる（もちろんリドゥもできる）TextBoxを自作しました。
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using System.Collections.Generic; using System.Windows.Forms; namespace NamespaceTextBoxEx { class TextBoxEx : TextBox { List<UndoBuf> undoBufs = new List<UndoBuf>(); List<UndoBuf> redoBufs = new List<UndoBuf>(); protected override void OnKeyPress(KeyPressEventArgs e) { e.Handled = true; int i = (int)e.KeyChar; if(i < 0x20 || i > 0x80) return; var str = e.KeyChar.ToString(); SelectedText = str; base.OnKeyPress(e); } protected override void OnKeyDown(KeyEventArgs e) { if(e.KeyCode == Keys.Back) { e.Handled = true; Back(); return; } if(e.KeyCode == Keys.Delete) { e.Handled = true; Delete(); return; } if(e.KeyCode == Keys.Enter) { e.Handled = true; BreakLine(); return; } if(e.KeyCode == Keys.X) { e.Handled = true; Cut(); return; } if(e.KeyCode == Keys.C) { e.Handled = true; Copy(); return; } if((e.KeyCode == Keys.V && e.Modifiers == Keys.Control) || (e.KeyCode == Keys.Insert && e.Modifiers == Keys.Shift)) { e.Handled = true; Paste(); return; } if(e.KeyCode == Keys.Z && e.Modifiers == Keys.Control) { e.Handled = true; Undo(); return; } if(e.KeyCode == Keys.Y && e.Modifiers == Keys.Control) { e.Handled = true; Redo(); return; } if(e.KeyCode == Keys.Tab) { SelectedText = "\t"; return; } } bool IsNextLineBreak() { if(SelectionLength != 0) return false; string s = Text; if(SelectionStart + 2 > TextLength) return false; string s2 = s.Substring(SelectionStart, 2); if(s2 == "\r\n") return true; else return false; } bool IsBeforeLineBreak() { string s = Text; if(SelectionStart - 2 < 0) return false; string s2 = s.Substring(SelectionStart - 2, 2); if(s2 == "\r\n") return true; else return false; } void Back() { if(SelectionLength > 0) { SelectedText = ""; } else { if(SelectionStart != 0) { if(IsBeforeLineBreak()) { SelectionStart -= 2; SelectionLength = 2; SelectedText = ""; } else { SelectionStart--; SelectionLength = 1; SelectedText = ""; } } } } void Delete() { if(SelectionLength > 0) { SelectedText = ""; } else { if(SelectionStart != TextLength) { if(IsNextLineBreak()) { SelectionLength = 2; SelectedText = ""; } else { SelectionLength = 1; SelectedText = ""; } } } } void BreakLine() { SelectedText = "\r\n"; } new string SelectedText { get { return base.SelectedText; } set { UndoBuf buf = new UndoBuf(); buf.DeleteStart = SelectionStart; buf.DeleteLength = SelectionLength; buf.DeleteString = SelectedText; buf.InsertStart = SelectionStart; buf.InsertLength = value.Length; buf.InsertString = value; redoBufs.Clear(); undoBufs.Insert(0, buf); base.SelectedText = value; } } new string Text { get { return base.Text; } set { undoBufs.Clear(); redoBufs.Clear(); base.Text = value; } } new void Undo() { if(undoBufs.Count == 0) return; UndoBuf buf = undoBufs[0]; undoBufs.RemoveAt(0); SelectionStart = buf.InsertStart; SelectionLength = buf.InsertLength; base.SelectedText = ""; SelectionStart = buf.DeleteStart; SelectionLength = 0; base.SelectedText = buf.DeleteString; redoBufs.Insert(0, buf); } void Redo() { if(redoBufs.Count == 0) return; UndoBuf buf = redoBufs[0]; redoBufs.RemoveAt(0); SelectionStart = buf.DeleteStart; SelectionLength = buf.DeleteLength; base.SelectedText = ""; SelectionStart = buf.InsertStart; SelectionLength = 0; base.SelectedText = buf.InsertString; undoBufs.Insert(0, buf); } new void Cut() { Clipboard.SetText(SelectedText); SelectedText = ""; } new void Paste() { string str = Clipboard.GetText(); SelectedText = str; } } public class UndoBuf { internal int DeleteStart { get; set; } = 0; internal int DeleteLength { get; set; } = 0; internal string DeleteString { get; set; } = ""; internal int InsertStart { get; set; } = 0; internal int InsertLength { get; set; } = 0; internal string InsertString { get; set; } = ""; } } |
