在 WinForms 中将按钮添加到列表视图中 [英] Adding button into a Listview in WinForms
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问题描述
有没有办法将按钮控件添加到 WinForms 应用程序中 ListView 内的单元格?
Is there a way to add a button control to a cell in inside a ListView in a WinForms app?
推荐答案
这里是一个 ListViewExtender 类的代码，你可以重用.它不是 ListView 的派生类，基本上你只是声明一个特定的列显示为按钮而不是文本.按钮的文本是子项的文本.
Here is a code of a class ListViewExtender that you can reuse. It's not a derived class of ListView, basically you just declare that a specific column is displayed as buttons instead of text. The button's text is the subItem's text.
它允许大尺寸的列表视图而不会出现问题，不使用 p/invoke，并且也适用于水平滚动条(作为答案在这里提出的一些代码没有或者非常慢，并且有大量项目).请注意，它需要扩展 ListView 将 FullRowSelect 设置为 true 并将视图类型设置为 Details.
It allows big sized list views without problems, does not use p/invoke, and also works with horizontal scrollbars (some code proposed as answers here don't or are quite slow with a great number of items). Note it requires the extended ListView to have FullRowSelect set to true and view type set to Details.
这是使用它的示例代码:
This is a sample code that uses it:
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent(); // you need to add a listView named listView1 with the designer
listView1.FullRowSelect = true;
ListViewExtender extender = new ListViewExtender(listView1);
// extend 2nd column
ListViewButtonColumn buttonAction = new ListViewButtonColumn(1);
buttonAction.Click += OnButtonActionClick;
buttonAction.FixedWidth = true;
extender.AddColumn(buttonAction);
for (int i = 0; i < 10000; i++)
{
ListViewItem item = listView1.Items.Add("item" + i);
item.SubItems.Add("button " + i);
}
}
private void OnButtonActionClick(object sender, ListViewColumnMouseEventArgs e)
{
MessageBox.Show(this, @"you clicked " + e.SubItem.Text);
}
}
}
这是 ListViewExtender 代码和相关类:
Here is the ListViewExtender code and associated classes:
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;
namespace WindowsFormsApplication1
{
public class ListViewExtender : IDisposable
{
private readonly Dictionary<int, ListViewColumn> _columns = new Dictionary<int, ListViewColumn>();
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<ListViewColumn> Columns
{
get
{
return _columns.Values;
}
}
public virtual void Dispose()
{
if (Font != null)
{
Font.Dispose();
Font = null;
}
}
}
public abstract class ListViewColumn
{
public event EventHandler<ListViewColumnMouseEventArgs> Click;
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);
}
}
}
}
这篇关于在 WinForms 中将按钮添加到列表视图中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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