如何在c# ListView中加入按钮
如何在c# ListView中加入按钮
以下代码可以不看直接去新建一个类并且编译，在.net3.5和4下是可以直接编译通过的，然后我们再来讲怎么使用。
代码如下：
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;
namespace PreBrokenXControl
{
public class ListViewExtender : IDisposable
{
private readonly Dictionary
public ListViewExtender(ListView listView)
{
if (listView == null)
throw new ArgumentNullException("listView");
if (listView.View != View.Details)
throw new ArgumentException(null, "listView");
ListView = listView;
ListView.OwnerDraw = true;
ListView.DrawItem += OnDrawItem;
ListView.DrawSubItem += OnDrawSubItem;
ListView.DrawColumnHeader += OnDrawColumnHeader;
ListView.MouseMove += OnMouseMove;
ListView.MouseClick += OnMouseClick;
Font = new Font(ListView.Font.FontFamily,
ListView.Font.Size - 2);
}
public virtual Font Font { get; private set; }
public ListView ListView { get; private set; }
protected virtual void OnMouseClick(object sender, MouseEventArgs e)
{
ListViewItem item;
ListViewItem.ListViewSubItem sub;
ListViewColumn column = GetColumnAt(e.X, e.Y, out item, out sub);
if (column != null)
{
column.MouseClick(e, item, sub);
}
}
public ListViewColumn GetColumnAt(int x, int y, out ListViewItem item, out ListViewItem.ListViewSubItem subItem)
{
subItem = null;
item = ListView.GetItemAt(x, y);
if (item == null)
return null;
subItem = item.GetSubItemAt(x, y);
if (subItem == null)
return null;
for (int i = 0; i < item.SubItems.Count; i++)
{
if (item.SubItems[i] == subItem)
return GetColumn(i);
}
return null;
}
protected virtual void OnMouseMove(object sender, MouseEventArgs e)
{
ListViewItem item;
ListViewItem.ListViewSubItem sub;
ListViewColumn column = GetColumnAt(e.X, e.Y, out item, out sub);
if (column != null)
{
column.Invalidate(item, sub);
return;
}
if (item != null)
{
ListView.Invalidate(item.Bounds);
}
}
protected virtual void OnDrawColumnHeader(object sender, DrawListViewColumnHeaderEventArgs e)
{
e.DrawDefault = true;
}
protected virtual void OnDrawSubItem(object sender, DrawListViewSubItemEventArgs e)
{
ListViewColumn column = GetColumn(e.ColumnIndex);
if (column == null)
{
e.DrawDefault = true;
return;
}
column.Draw(e);
}
protected virtual void OnDrawItem(object sender, DrawListViewItemEventArgs e)
{
// do nothing
}
public void AddColumn(ListViewColumn column)
{
if (column == null)
throw new ArgumentNullException("column");
column.Extender = this;
_columns[column.ColumnIndex] = column;
}
public ListViewColumn GetColumn(int index)
{
ListViewColumn column;
return _columns.TryGetValue(index, out column) ? column : null;
}
public IEnumerable
{
get
{
return _columns.Values;
}
}
public virtual void Dispose()
{
if (Font != null)
{
Font.Dispose();
Font = null;
}
}
}
public abstract class ListViewColumn
{
public event EventHandler
protected ListViewColumn(int columnIndex)
{
if (columnIndex < 0)
throw new ArgumentException(null, "columnIndex");
ColumnIndex = columnIndex;
}
public virtual ListViewExtender Extender { get; protected internal set; }
public int ColumnIndex { get; private set; }
public virtual Font Font
{
get
{
return Extender == null ? null : Extender.Font;
}
}
public ListView ListView
{
get
{
return Extender == null ? null : Extender.ListView;
}
}
public abstract void Draw(DrawListViewSubItemEventArgs e);
public virtual void MouseClick(MouseEventArgs e, ListViewItem item, ListViewItem.ListViewSubItem subItem)
{
if (Click != null)
{
Click(this, new ListViewColumnMouseEventArgs(e, item, subItem));
}
}
public virtual void Invalidate(ListViewItem item, ListViewItem.ListViewSubItem subItem)
{
if (Extender != null)
{
Extender.ListView.Invalidate(subItem.Bounds);
}
}
}
public class ListViewColumnMouseEventArgs : MouseEventArgs
{
public ListViewColumnMouseEventArgs(MouseEventArgs e, ListViewItem item, ListViewItem.ListViewSubItem subItem)
: base(e.Button, e.Clicks, e.X, e.Y, e.Delta)
{
Item = item;
SubItem = subItem;
}
public ListViewItem Item { get; private set; }
public ListViewItem.ListViewSubItem SubItem { get; private set; }
}
public class ListViewButtonColumn : ListViewColumn
{
private Rectangle _hot = Rectangle.Empty;
public ListViewButtonColumn(int columnIndex)
: base(columnIndex)
{
}
public bool FixedWidth { get; set; }
public bool DrawIfEmpty { get; set; }
public override ListViewExtender Extender
{
get
{
return base.Extender;
}
protected internal set
{
base.Extender = value;
if (FixedWidth)
{
base.Extender.ListView.ColumnWidthChanging += OnColumnWidthChanging;
}
}
}
protected virtual void OnColumnWidthChanging(object sender, ColumnWidthChangingEventArgs e)
{
if (e.ColumnIndex == ColumnIndex)
{
e.Cancel = true;
e.NewWidth = ListView.Columns[e.ColumnIndex].Width; }
}
public override void Draw(DrawListViewSubItemEventArgs e) {
if (_hot != Rectangle.Empty)
{
if (_hot != e.Bounds)
{
ListView.Invalidate(_hot);
_hot = Rectangle.Empty;
}
}
if ((!DrawIfEmpty) &&
(string.IsNullOrEmpty(e.SubItem.Text)))
return;
Point mouse =
e.Item.ListView.PointToClient(Control.MousePosition);
if ((ListView.GetItemAt(mouse.X, mouse.Y) == e.Item) && (e.Item.GetSubItemAt(mouse.X, mouse.Y) == e.SubItem))
{
ButtonRenderer.DrawButton(e.Graphics, e.Bounds,
e.SubItem.Text, Font, true, PushButtonState.Hot);
_hot = e.Bounds;
}
else
{
ButtonRenderer.DrawButton(e.Graphics, e.Bounds,
e.SubItem.Text, Font, false, PushButtonState.Default);
}
}
}
}
然后才是关键的，如何使用。这个东西的核心就是把控件里面的列给替换成按钮。嗯……虽然他的函数写的是Add，实际上是替换的操作。添加按钮仅限于Detail模式并且是FullRowSelect。演示代码如下：
//我在这里是把初始化代码放在了一个函数里面
private void InitializeListView()
{
c_listPathFilter.FullRowSelect = true;
c_listPathFilter.GridLines = true;
c_ex = new PreBrokenXControl.ListViewExtender(c_listPathFilter as ListView);//创建了ListViewExtender类
PreBrokenXControl.ListViewButtonColumn colDel = new
PreBrokenXControl.ListViewButtonColumn(0);//创建了一个按钮,0表示这个按钮在列的第0列,当然这个第0列是要确实存在的
colDel.FixedWidth = true;//表示自动适应大小
//这里设置按钮的click方法
colDel.Click += (object sender,
PreBrokenXControl.ListViewColumnMouseEventArgs e) =>
{
//删除
RemoveNotifyColumns(e.Item);
};
c_ex.AddColumn(colDel);//将它添加到列里面去
}
通过上面这个方法，我们就可以把按钮丢到ListView里面去。而添加数据的方法与往常是相同的，只是在这个实例中列的第0项会变成按钮。当然，通过不同的重绘方法和事件注册，也可以添加成进度条什么的。
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