GroupBox с возможностью сворачивания и разворачивания, реализован по аналогии с проектом найденным на просторах http://www.codeproject.com в который были внесены некоторые изменения:
- Высота свернутого GroupBox’а указывается в дизайнере.
- Состояние GroupBox’а указывается в дизайнере.
- Кнопка сворачивания рисуется как в TreeView.
Исходный код: CollapsibleGroupBoxExample (zip, 6.03 Кб)
Описание класса:
1 using System.ComponentModel;
2 using System.Drawing;
3 using System.Windows.Forms.VisualStyles;
4
5 namespace System.Windows.Forms
6 {
7 /// <summary>
8 /// GroupBox with collapsible feature
9 /// </summary>
10 public partial class CollapsibleGroupBox : GroupBox
11 {
12 #region Members
13
14 private bool m_IsCollapsed = false;
15 private int m_CollapsedHeight = 20;
16 private int m_ExpandedHeight = 20;
17 private Rectangle m_GlyphRect = Rectangle.Empty;
18
19 #endregion
20
21 #region Properties
22
23 /// <summary>
24 /// GroupBox collapsed state
25 /// </summary>
26 [DefaultValue(false)]
27 public bool IsCollapsed
28 {
29 get { return m_IsCollapsed; }
30 set
31 {
32 if (m_IsCollapsed != value)
33 {
34 m_IsCollapsed = value;
35
36 if (m_IsCollapsed)
37 {
38 m_ExpandedHeight = Height;
39 Height = m_CollapsedHeight;
40 }
41 else
42 Height = m_ExpandedHeight;
43
44 foreach (Control control in Controls)
45 control.Visible = !m_IsCollapsed;
46 }
47 }
48 }
49
50 /// <summary>
51 /// GroupBox colapsed height
52 /// </summary>
53 [DefaultValue(20)]
54 public int CollapsedHeight
55 {
56 get { return m_CollapsedHeight; }
57 set
58 {
59 if (m_CollapsedHeight != value)
60 {
61 m_CollapsedHeight = value;
62 if (m_IsCollapsed)
63 Height = m_CollapsedHeight;
64 }
65 }
66 }
67
68 #endregion
69
70 #region Overrides
71
72 /// <summary>
73 /// Change collapsed state in runtime mode
74 /// </summary>
75 /// <param name="e">
76 /// A <seealso cref="System.Windows.Forms.MouseEventArgs"/> that contains the event data
77 /// </param>
78 protected override void OnMouseUp(MouseEventArgs e)
79 {
80 if (m_GlyphRect.Contains(e.Location))
81 IsCollapsed = !IsCollapsed;
82 else
83 base.OnMouseUp(e);
84 }
85
86 /// <summary>
87 /// Change collapsed height in design mode
88 /// </summary>
89 /// <param name="e">
90 /// An <seealso cref="System.EventArgs"/> that contains the event data
91 /// </param>
92 protected override void OnResize(EventArgs e)
93 {
94 if (DesignMode && IsCollapsed)
95 CollapsedHeight = Height;
96 else
97 base.OnResize(e);
98 }
99
100 /// <summary>
101 /// Paint GroupBox with open/close glyph
102 /// </summary>
103 /// <param name="e">
104 /// A <seealso cref="System.Windows.Forms.PaintEventArgs"/> that contains the event data
105 /// </param>
106 protected override void OnPaint(PaintEventArgs e)
107 {
108 // Draw GroupBox
109 Rectangle bounds = new Rectangle(ClientRectangle.X,
ClientRectangle.Y + Font.Height / 2,
ClientRectangle.Width,
ClientRectangle.Height - Font.Height / 2);
110 GroupBoxRenderer.DrawGroupBox(e.Graphics,
bounds,
Enabled ? GroupBoxState.Normal : GroupBoxState.Disabled);
111
112 // Draw GroupBox glyph
113 VisualStyleRenderer glyphRenderer = new VisualStyleRenderer(IsCollapsed ?
VisualStyleElement.TreeView.Glyph.Closed :
VisualStyleElement.TreeView.Glyph.Opened);
114 Size glyphSize = glyphRenderer.GetPartSize(e.Graphics, ThemeSizeType.Draw);
115 m_GlyphRect = new Rectangle(bounds.X + 8,
bounds.Y - glyphSize.Height / 2,
glyphSize.Width,
glyphSize.Height);
116 glyphRenderer.DrawBackground(e.Graphics, m_GlyphRect);
117
118 // Draw GroupBox text
119 Point textPoint = new Point(m_GlyphRect.Right + 2, 0);
120 TextRenderer.DrawText(e.Graphics, Text, Font, textPoint,
Enabled ? SystemColors.ActiveCaption : SystemColors.GrayText, BackColor);
121 }
122
123 #endregion
124 }
125 }
Рубрика: Visual Studio | Помечено: Controls, Visual Studio
