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95 lines
2.6 KiB
C#
95 lines
2.6 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Windows.Forms;
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namespace CodeWalker.WinForms
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{
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public partial class TextBoxFix : TextBox
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{
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bool ignoreChange = true;
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List<string> storageUndo;
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List<string> storageRedo;
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public TextBoxFix()
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{
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InitializeComponent();
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}
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protected override void OnPaint(PaintEventArgs pe)
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{
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base.OnPaint(pe);
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}
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protected override void OnCreateControl()
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{
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base.OnCreateControl();
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storageRedo = new List<string>();
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storageUndo = new List<string> { Text };
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ignoreChange = false;
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}
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protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
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{
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//Fix for Ctrl-A/Z/Y not working in multiline textboxes.
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const int WM_KEYDOWN = 0x100;
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var keyCode = (Keys)(msg.WParam.ToInt32() & Convert.ToInt32(Keys.KeyCode));
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if (msg.Msg == WM_KEYDOWN && (ModifierKeys == Keys.Control) && Focused)
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{
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if (keyCode == Keys.A)
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{
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SelectAll();
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return true;
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}
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if (keyCode == Keys.Z)
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{
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Undo();
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return true;
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}
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if (keyCode == Keys.Y)
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{
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Redo();
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return true;
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}
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}
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return base.ProcessCmdKey(ref msg, keyData);
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}
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protected override void OnTextChanged(EventArgs e)
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{
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base.OnTextChanged(e);
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if (!ignoreChange)
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{
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ClearUndo();
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if (storageUndo.Count > 2048) storageUndo.RemoveAt(0);
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if (storageRedo.Count > 2048) storageRedo.RemoveAt(0);
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storageUndo.Add(Text);
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}
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}
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public void Redo()
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{
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if (storageRedo.Count > 0)
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{
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ignoreChange = true;
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Text = storageRedo[storageRedo.Count - 1];
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storageUndo.Add(Text);
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storageRedo.RemoveAt(storageRedo.Count - 1);
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ignoreChange = false;
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}
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}
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public new void Undo()
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{
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if (storageUndo.Count > 1)
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{
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ignoreChange = true;
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Text = storageUndo[storageUndo.Count - 2];
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storageRedo.Add(storageUndo[storageUndo.Count - 1]);
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storageUndo.RemoveAt(storageUndo.Count - 1);
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ignoreChange = false;
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}
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}
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}
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}
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