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winform下重画ListBox
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Windows Forms是由Win32 API封装的开发组件，最初是为了替代mfc，但却没有体现与Model View Controller架构对应的特色，进而在.net framework 3.0中推出了wpf，富控件数据显示方面，利用模板功能轻松实现。
在winform下要想自定义一些用户控件，就需要运用的2D绘画类。下图我们为ListBox重新排列了数据显示方式，并为每一个item加入了删除按钮。
首先我们设计一个承载数据的类ListBoxItem。
1
public
class
ListBoxItem : IDisposable
2
{
3
public Guid Id { get; set; }
4 5publicstring Name { get; set; }
6 7publicstring IP { get; set; }
8 9publicstring Mac { get; set; }
1011 [System.ComponentModel.DefaultValue(typeof(System.Drawing.Image), "null")]
12public System.Drawing.Image Image { get; set; }
1314publicbool IsFocus { get; set; }
1516public ListBoxItem() { }
1718public ListBoxItem(Guid id, string name, string ip, string mac, System.Drawing.Image image)
19 {
20this.Id = id;
21this.Name = name;
22this.IP = ip;
23this.Mac = mac;
24this.Image = image;
25this.IsFocus = false;
26 }
2728publicvoid Dispose()
29 {
30this.Image = null;
31 }
32 }
然后我们再为ListBox写一个用于展现数据的数据源ListBoxItemCollection，这里实现了迭代和集合操作接口，可以根据需要扩展数据操作方法。
[System.ComponentModel.ListBindable(false)] publicclass ListBoxItemCollection : IList, ICollection, IEnumerable { private UserListBox m_owner; public ListBoxItemCollection(UserListBox owner) { this.m_owner = owner; } internal UserListBox Owner { get { returnthis.m_owner; } } #region override public ListBoxItem this[int index] { get { return Owner.OldItemSource[index] as ListBoxItem; } set { Owner.OldItemSource[index] = value; } } publicint Count { get { return Owner.OldItemSource.Count; } } publicbool IsReadOnly { get { return Owner.OldItemSource.IsReadOnly; } } publicint Add(ListBoxItem item) { if (item == null) { thrownew ArgumentException("item is null"); } return Owner.OldItemSource.Add(item); } publicvoid AddRange(ListBoxItem[] items) { Owner.OldItemSource.AddRange(items); } publicvoid Clear() { if (Owner.OldItemSource.Count > 0) { Owner.OldItemSource.Clear(); } } publicbool Contains(ListBoxItem item) { bool rst = false; foreach (ListBoxItem oldItem in Owner.OldItemSource) { if (oldItem.Id == item.Id) { rst = true; break; } } return rst; } publicvoid CopyTo(ListBoxItem[] destination, int arrayIndex) { Owner.OldItemSource.CopyTo(destination, arrayIndex); } publicint IndexOf(ListBoxItem item) { return Owner.OldItemSource.IndexOf(item); } publicvoid Insert(int index, ListBoxItem item) { if (item == null) { thrownew ArgumentException("item is null"); } Owner.OldItemSource.Insert(index, item); } publicvoid Remove(ListBoxItem item) { Owner.OldItemSource.Remove(item); } publicvoid RemoveAt(int index) { Owner.OldItemSource.RemoveAt(index); } public IEnumerator GetEnumerator() { return Owner.OldItemSource.GetEnumerator(); } int IList.Add(object value) { if (!(value is ListBoxItem)) { thrownew ArgumentException(); } return Add(value as ListBoxItem); } void IList.Clear() { Clear(); } bool IList.Contains(object value) { return Contains(value as ListBoxItem); } int IList.IndexOf(object value) { return IndexOf(value as ListBoxItem); } void IList.Insert(int index, object value) { if (!(value is ListBoxItem)) { thrownew ArgumentException(); } Insert(index, value as ListBoxItem); } bool IList.IsFixedSize { get { returnfalse; } } bool IList.IsReadOnly { get { return IsReadOnly; } } void IList.Remove(object value) { Remove(value as ListBoxItem); } void IList.RemoveAt(int index) { RemoveAt(index); } object IList.this[int index] { get { returnthis[index]; } set { if (!(value is ListBoxItem)) { thrownew ArgumentException(); } this[index] = value as ListBoxItem; } } void ICollection.CopyTo(Array array, int index) { CopyTo((ListBoxItem[])array, index); } int ICollection.Count { get { return Count; } } bool ICollection.IsSynchronized { get { returnfalse; } } object ICollection.SyncRoot { get { returnfalse; } } IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); } #endregion#region extention public ListBoxItem FindByMac(string mac) { foreach (ListBoxItem item in Owner.OldItemSource) { if (item.Mac == mac) { return item; } } returnnull; } #endregion }
下面可以为工程new一个新项——自定义控件，命名为UserListBox。
这里有几个地方要说明一下，首先在默认构造函数里面的参数：
DrawMode.OwnerDrawVariable启用控件重绘功能。
DoubleBuffer开启后避免复杂绘画造成窗体闪烁，这个缓冲的原理是将绘画操作放在内存里操作，完成后才会复制到图形界面上，进而避免的闪烁。
OnPaint进行了重写，这个方法是根据pc屏幕分辨率刷新频率来执行的，会不断的重复执行，进而持久化图形界面。
Invalidate方法，会立即刷新UI。
Item上的按钮事件，是通过ListBox的click事件，取到鼠标的在界面上的定位，调用相对应的方法。
1
public
partial
class
UserListBox : ListBox
2
{
3
public
ListBoxItem mouseItem;
4
private
ListBoxItemCollection m_Items;
5
6
public UserListBox() : base()
7 {
8 InitializeComponent();
9 10 m_Items = new ListBoxItemCollection(this);
11 12base.DrawMode = DrawMode.OwnerDrawVariable;
13this.SetStyle(ControlStyles.UserPaint, true);
14this.SetStyle(ControlStyles.DoubleBuffer, true); // 双缓冲 15this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true); // 双缓冲 16this.SetStyle(ControlStyles.ResizeRedraw, true); // 调整大小时重绘 17this.SetStyle(ControlStyles.AllPaintingInWmPaint, true); // 禁止擦除背景. 18this.SetStyle(ControlStyles.SupportsTransparentBackColor, true); // 开启控件透明 19 }
20 21publicnew ListBoxItemCollection Items
22 {
23get { return m_Items; }
24 }
25 26internal ListBox.ObjectCollection OldItemSource
27 {
28get { returnbase.Items; }
29 }
30 31protectedoverridevoid OnPaint(PaintEventArgs e)
32 {
33 Graphics g = e.Graphics;
34 35// you can set SeletedItem background 36if (this.Focused && this.SelectedItem != null)
37 {
38 }
39 40for (int i = 0; i < Items.Count; i++)
41 {
42 Rectangle bounds = this.GetItemRectangle(i);
43 44if (mouseItem == Items[i])
45 {
46 Color leftColor = Color.FromArgb(200, 192, 224, 248);
47using (SolidBrush brush = new SolidBrush(leftColor))
48 {
49 g.FillRectangle(brush, new Rectangle(bounds.X, bounds.Y, bounds.Width, bounds.Height));
50 }
51 52 Color rightColor = Color.FromArgb(252, 233, 161);
53using (SolidBrush brush = new SolidBrush(rightColor))
54 {
55 g.FillRectangle(brush, new Rectangle(bounds.Width - 40, bounds.Y, 40, bounds.Height));
56 }
57 }
58 59int fontLeft = bounds.Left + 40 + 15;
60 System.Drawing.Font font = new System.Drawing.Font("微软雅黑", 9);
61 g.DrawString(Items[i].Name, font, new SolidBrush(this.ForeColor), fontLeft, bounds.Top + 5);
62 g.DrawString(Items[i].IP, font, new SolidBrush(Color.FromArgb(128, 128, 128)), fontLeft, bounds.Top + 20);
63 g.DrawString(Items[i].Mac, font, new SolidBrush(Color.FromArgb(128, 128, 128)), fontLeft, bounds.Top + 35);
64 65if (Items[i].Image != null)
66 {
67 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear;
68 g.DrawImage(Items[i].Image, new Rectangle(bounds.X + 5, (bounds.Height - 40) / 2 + bounds.Top, 40, 40));
69 }
70 g.DrawImage(Properties.Resources.error, new Rectangle(bounds.Width - 28, (bounds.Height - 16) / 2 + bounds.Top, 16, 16));
71 }
72base.OnPaint(e);
73 }
74 75protectedoverridevoid OnMeasureItem(MeasureItemEventArgs e)
76 {
77base.OnMeasureItem(e);
78if (Items.Count > 0)
79 {
80 ListBoxItem item = Items[e.Index];
81 e.ItemHeight = 54;
82 }
83 84 }
85 86protectedoverridevoid OnSelectedIndexChanged(EventArgs e)
87 {
88base.OnSelectedIndexChanged(e);
89 }
90 91protectedoverridevoid OnMouseMove(MouseEventArgs e)
92 {
93base.OnMouseMove(e);
94for (int i = 0; i < Items.Count; i++)
95 {
96 Rectangle bounds = this.GetItemRectangle(i);
97 Rectangle deleteBounds = new Rectangle(bounds.Width - 28, (bounds.Height - 16) / 2 + bounds.Top, 16, 16);
98 99if (bounds.Contains(e.X, e.Y))
100 {
101if (Items[i] != mouseItem)
102 {
103 mouseItem = Items[i];
104 }
105106if (deleteBounds.Contains(e.X, e.Y))
107 {
108 mouseItem.IsFocus = true;
109this.Cursor = Cursors.Hand;
110 }
111else112 {
113 mouseItem.IsFocus = false;
114this.Cursor = Cursors.Arrow;
115 }
116117this.Invalidate();
118break;
119 }
120 }
121 }
122123protectedoverridevoid OnMouseClick(MouseEventArgs e)
124 {
125base.OnMouseClick(e);
126if (mouseItem.IsFocus)
127 {
128 ListBoxItem deleteItem = mouseItem;
129if(MessageBox.Show("confirm to delete", "", MessageBoxButtons.OKCancel) == DialogResult.OK)
130 {
131this.Items.Remove(deleteItem);
132 }
133 }
134 }
135136protectedoverridevoid OnMouseLeave(EventArgs e)
137 {
138base.OnMouseLeave(e);
139this.mouseItem = null;
140this.Invalidate();
141 }
142 }
原文：http://www.cnblogs.com/yuefei/p/4062998.html
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