source: branches/GeneralizedQAP/HeuristicLab.Problems.GeneralizedQuadraticAssignment.Views/3.3/ToolTipComboBox.cs @ 7523

Last change on this file since 7523 was 7523, checked in by abeham, 8 years ago

#1614

  • sorted operators
  • added crossover defined by Cordeau et al.
  • fixed a few bugs
File size: 7.1 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2012 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.Drawing;
24using System.Windows.Forms;
25using System.Windows.Forms.VisualStyles;
26
27namespace HeuristicLab.Problems.GeneralizedQuadraticAssignment.Views {
28  public partial class ToolTipComboBox : ComboBox {
29
30    private ComboBoxState comboBoxState = ComboBoxState.Normal;
31    private bool mouseOver = false;
32
33    public ToolTipComboBox()
34      : base() {
35      SetStyle(ControlStyles.AllPaintingInWmPaint, true);
36      SetStyle(ControlStyles.UserPaint, true);
37      InitializeComponent();
38      DrawMode = System.Windows.Forms.DrawMode.OwnerDrawVariable;
39      DropDownStyle = ComboBoxStyle.DropDownList;
40    }
41
42    protected override void OnMeasureItem(MeasureItemEventArgs e) {
43      base.OnMeasureItem(e);
44      string text = GetItemText(Items[e.Index]);
45      if (string.IsNullOrEmpty(text)) text = "test";
46      var rect = TextRenderer.MeasureText(text, Font);
47      e.ItemHeight = rect.Height - 2;
48      e.ItemWidth = rect.Width;
49    }
50
51    protected override void OnDrawItem(DrawItemEventArgs e) {
52      base.OnDrawItem(e);
53      var args = new ToolTipRequiredEventArgs(e.Index, e.Index >= 0 ? Items[e.Index] : null);
54      if (e.Index >= 0) OnToolTipRequired(args);
55      if (!e.State.HasFlag(DrawItemState.ComboBoxEdit) && !string.IsNullOrEmpty(args.ToolTip)) {
56        var ttRect = TextRenderer.MeasureText(args.ToolTip, Font);
57        if (RectangleToScreen(e.Bounds).Right + ttRect.Width > Screen.FromControl(this).Bounds.Right)
58          toolTip.Show(args.ToolTip, this, e.Bounds.Left - ttRect.Width, e.Bounds.Bottom);
59        else toolTip.Show(args.ToolTip, this, e.Bounds.Right, e.Bounds.Bottom);
60      } else toolTip.Hide(this);
61      if (!e.State.HasFlag(DrawItemState.ComboBoxEdit))
62        e.DrawBackground();
63      if (e.Index > -1 && Items.Count > 0) {
64        if (!e.State.HasFlag(DrawItemState.ComboBoxEdit) && e.State.HasFlag(DrawItemState.Selected)) {
65          using (var b = new SolidBrush(BackColor)) {
66            e.Graphics.DrawString(GetItemText(Items[e.Index]), Font, b, e.Bounds);
67          }
68        } else if (!e.State.HasFlag(DrawItemState.ComboBoxEdit)) {
69          using (var b = new SolidBrush(ForeColor)) {
70            e.Graphics.DrawString(GetItemText(Items[e.Index]), Font, b, e.Bounds);
71          }
72        } else {
73          using (var b = new SolidBrush(ForeColor)) {
74            Rectangle r = e.Bounds;
75            r.Offset(0, 1);
76            e.Graphics.DrawString(GetItemText(Items[e.Index]), Font, b, r);
77          }
78        }
79      }
80      e.DrawFocusRectangle();
81    }
82
83    protected override void OnPaint(PaintEventArgs e) {
84      base.OnPaint(e);
85      if (Enabled == false) comboBoxState = ComboBoxState.Disabled;
86      Rectangle clip = Bounds; // using e.ClipRectangle leads to strange behavior when maximizing/unmaximizing, just redraw the entire region all the time
87      clip.Offset(-clip.X, -clip.Y); // x and y need to be 0
88      if (VisualStyleInformation.IsSupportedByOS && VisualStyleInformation.IsEnabledByUser) {
89        PushButtonState pb_State = PushButtonState.Normal;
90        if (comboBoxState == ComboBoxState.Disabled)
91          pb_State = PushButtonState.Disabled;
92        else if (comboBoxState == ComboBoxState.Hot)
93          pb_State = PushButtonState.Hot;
94        else if (comboBoxState == ComboBoxState.Pressed)
95          pb_State = PushButtonState.Pressed;
96
97        ButtonRenderer.DrawButton(e.Graphics, clip, pb_State);
98        var r = new Rectangle(clip.Right - SystemInformation.VerticalScrollBarWidth + 2,
99                                    clip.Top,
100                                    SystemInformation.VerticalScrollBarWidth - 4,
101                                    clip.Height);
102        DrawArrow(e.Graphics, r);
103      } else {
104        ComboBoxRenderer.DrawTextBox(e.Graphics, clip, comboBoxState);
105        var r = new Rectangle(clip.Right - SystemInformation.VerticalScrollBarWidth,
106                                    clip.Top,
107                                    SystemInformation.VerticalScrollBarWidth,
108                                    clip.Height);
109        ComboBoxRenderer.DrawDropDownButton(e.Graphics, r, comboBoxState);
110      }
111      Rectangle rect = clip;
112      rect.Inflate(-2, -4);
113      rect.Offset(1, 0);
114      if (SelectedIndex > -1 && Items.Count > 0) {
115        using (var b = new SolidBrush(ForeColor)) {
116          e.Graphics.DrawString(GetItemText(Items[SelectedIndex]), Font, b, rect);
117        }
118      }
119    }
120
121    private void DrawArrow(Graphics g, Rectangle rect) {
122      Point p1 = new Point(rect.X + 3, rect.Y + rect.Height / 2 - 2);
123      Point p2 = new Point(rect.X + rect.Width - 3, rect.Y + rect.Height / 2 - 2);
124      Point p3 = new Point(rect.X + rect.Width / 2, rect.Y + rect.Height / 2 + 2);
125      g.FillPolygon(new SolidBrush(System.Drawing.SystemColors.ControlText), new Point[] { p1, p2, p3 });
126    }
127
128    protected override void OnDropDown(EventArgs e) {
129      base.OnDropDown(e);
130      comboBoxState = ComboBoxState.Pressed;
131      Invalidate();
132    }
133
134    protected override void OnDropDownClosed(EventArgs e) {
135      base.OnDropDownClosed(e);
136      toolTip.Hide(this);
137      comboBoxState = ComboBoxState.Normal;
138      Invalidate();
139    }
140
141    protected override void OnMouseEnter(EventArgs e) {
142      base.OnMouseEnter(e);
143      mouseOver = true;
144      if (comboBoxState == ComboBoxState.Normal) {
145        comboBoxState = ComboBoxState.Hot;
146        Invalidate();
147      }
148    }
149
150    protected override void OnMouseHover(EventArgs e) {
151      base.OnMouseHover(e);
152      if (comboBoxState == ComboBoxState.Normal) {
153        comboBoxState = ComboBoxState.Hot;
154        Invalidate();
155      }
156    }
157
158    protected override void OnMouseLeave(EventArgs e) {
159      base.OnMouseLeave(e);
160      mouseOver = false;
161      if (comboBoxState == ComboBoxState.Hot) {
162        comboBoxState = ComboBoxState.Normal;
163        Invalidate();
164      }
165    }
166
167    protected override void OnMouseDown(MouseEventArgs e) {
168      base.OnMouseDown(e);
169      comboBoxState = ComboBoxState.Pressed;
170      Invalidate();
171    }
172
173    public event EventHandler<ToolTipRequiredEventArgs> ToolTipRequired;
174    protected virtual void OnToolTipRequired(ToolTipRequiredEventArgs args) {
175      var handler = ToolTipRequired;
176      if (handler != null) handler(this, args);
177    }
178  }
179}
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