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source: trunk/sources/HeuristicLab.MainForm.WindowsForms/3.3/Controls/ControlExtensions.cs @ 11662

Last change on this file since 11662 was 11171, checked in by ascheibe, 10 years ago

#2115 merged r11170 (copyright update) into trunk

File size: 2.3 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2014 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Collections.Generic;
24using System.Runtime.InteropServices;
25using System.Windows.Forms;
26
27namespace HeuristicLab.MainForm.WindowsForms {
28  public static class ControlExtensions {
29    [DllImport("user32.dll")]
30    private static extern int SendMessage(IntPtr hWnd, Int32 wMsg, bool wParam, Int32 lParam);
31
32    private const int WM_SETREDRAW = 11;
33
34    public static void SuspendRepaint(this Control control) {
35      if (control.InvokeRequired)
36        control.Invoke(new Action<Control>(c => c.SuspendRepaint()), control);
37      else
38        SendMessage(control.Handle, WM_SETREDRAW, false, 0);
39    }
40    public static void ResumeRepaint(this Control control, bool refresh) {
41      if (control.InvokeRequired)
42        control.Invoke(new Action<Control, bool>((c, b) => c.ResumeRepaint(b)), control, refresh);
43      else {
44        SendMessage(control.Handle, WM_SETREDRAW, true, 0);
45        if (refresh) control.Refresh();
46      }
47    }
48
49    public static IEnumerable<Control> GetNestedControls(this Control control, Func<Control, bool> condition = null) {
50      if (control == null) yield break;
51      if (condition == null) condition = (c) => true;
52
53      Queue<Control> unprocessed = new Queue<Control>();
54      unprocessed.Enqueue(control);
55
56      while (unprocessed.Count > 0) {
57        Control c = unprocessed.Dequeue();
58        if (condition(c)) yield return c;
59        foreach (Control child in c.Controls)
60          unprocessed.Enqueue(child);
61      }
62    }
63  }
64}
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