1 // OpenTween - Client of Twitter
2 // Copyright (c) 2015 kim_upsilon (@kim_upsilon) <https://upsilo.net/~upsilon/>
3 // All rights reserved.
5 // This file is part of OpenTween.
7 // This program is free software; you can redistribute it and/or modify it
8 // under the terms of the GNU General Public License as published by the Free
9 // Software Foundation; either version 3 of the License, or (at your option)
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 // or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 // You should have received a copy of the GNU General Public License along
18 // with this program. If not, see <http://www.gnu.org/licenses/>, or write to
19 // the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
20 // Boston, MA 02110-1301, USA.
23 using System.Collections.Generic;
26 using System.Reflection;
28 using System.Threading.Tasks;
29 using System.Windows.Forms;
34 /// コントロールにフォーカスが当たってなくても無理矢理 MouseWheel イベントを発生させるクラス
36 public class MouseWheelMessageFilter : IMessageFilter
38 private readonly List<Control> controls = new List<Control>();
40 public MouseWheelMessageFilter()
42 Application.AddMessageFilter(this);
45 public void Register(Control target)
47 this.controls.Add(target);
50 public void Unregister(Control target)
52 this.controls.Remove(target);
55 public bool PreFilterMessage(ref Message m)
57 const int WM_MOUSEWHEEL = 0x020A;
59 if (m.Msg == WM_MOUSEWHEEL)
61 foreach (var control in this.controls)
63 // フォーカスが当たっている時は何もしなくても MouseWheel イベントが発生するので無視
67 var screenLocation = new Point((int)m.LParam);
68 var controlRectangle = control.Parent.RectangleToScreen(control.DisplayRectangle);
69 if (controlRectangle.Contains(screenLocation))
71 var clientLocation = control.PointToClient(screenLocation);
72 var wheelDelta = (int)m.WParam >> 16;
74 var ev = new HandledMouseEventArgs(MouseButtons.None, 0, clientLocation.X, clientLocation.Y, wheelDelta);
75 this.RaiseMouseWheelEvent(control, ev);
85 public void RaiseMouseWheelEvent(Control control, MouseEventArgs e)
87 var method = typeof(Control).GetMethod("OnMouseWheel", BindingFlags.Instance | BindingFlags.NonPublic);
88 method.Invoke(control, new[] { e });