开始写了一个,关键点是弹出TreeView 控件,但是把TreeView 做成一个窗体,弹出,还是有什么办法,一查VS2005有一个类窗体弹出类(很强大的对象)ToolStripDropDown, 在使用此类的时候需要传递一个ToolStripControlHost类型的对象,还有个问题就是,TreeView 弹出了,会在它的上方出现了一条小白条,这个问题很棘手,不过如果你懂Win32那就一切OK了,好,我们看看这个类吧.
一:ComboBoxTreeView
using System.Data;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication14
{
public class ComboBoxTreeView : ComboBox
{
private const int WM_LBUTTONDOWN = 0x201, WM_LBUTTONDBLCLK = 0x203;
ToolStripControlHost treeViewHost;
ToolStripDropDown dropDown;
public ComboBoxTreeView()
{
TreeView treeView = new TreeView();
treeView.AfterSelect+=new TreeViewEventHandler(treeView_AfterSelect);
treeView.BorderStyle = BorderStyle.None;
treeViewHost = new ToolStripControlHost(treeView);
dropDown = new ToolStripDropDown();
dropDown.Width = this.Width;
dropDown.Items.Add(treeViewHost);
}
public void treeView_AfterSelect(object sender, TreeViewEventArgs e)
{
this.Text=TreeView.SelectedNode.Text;
dropDown.Close();
}
public TreeView TreeView
{
get { return treeViewHost.Control as TreeView; }
}
private void ShowDropDown()
{
if (dropDown != null)
{
treeViewHost.Size =new Size(DropDownWidth-2,DropDownHeight);
dropDown.Show(this, 0, this.Height);
}
}
protected override void WndProc(ref Message m)
{
if (m.Msg == WM_LBUTTONDBLCLK || m.Msg == WM_LBUTTONDOWN)
{
ShowDropDown();
return;
}
base.WndProc(ref m);
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (dropDown != null)
{
dropDown.Dispose();
dropDown = null;
}
}
base.Dispose(disposing);
}
}
}
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication14
{
public class ComboBoxTreeView : ComboBox
{
private const int WM_LBUTTONDOWN = 0x201, WM_LBUTTONDBLCLK = 0x203;
ToolStripControlHost treeViewHost;
ToolStripDropDown dropDown;
public ComboBoxTreeView()
{
TreeView treeView = new TreeView();
treeView.AfterSelect+=new TreeViewEventHandler(treeView_AfterSelect);
treeView.BorderStyle = BorderStyle.None;
treeViewHost = new ToolStripControlHost(treeView);
dropDown = new ToolStripDropDown();
dropDown.Width = this.Width;
dropDown.Items.Add(treeViewHost);
}
public void treeView_AfterSelect(object sender, TreeViewEventArgs e)
{
this.Text=TreeView.SelectedNode.Text;
dropDown.Close();
}
public TreeView TreeView
{
get { return treeViewHost.Control as TreeView; }
}
private void ShowDropDown()
{
if (dropDown != null)
{
treeViewHost.Size =new Size(DropDownWidth-2,DropDownHeight);
dropDown.Show(this, 0, this.Height);
}
}
protected override void WndProc(ref Message m)
{
if (m.Msg == WM_LBUTTONDBLCLK || m.Msg == WM_LBUTTONDOWN)
{
ShowDropDown();
return;
}
base.WndProc(ref m);
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (dropDown != null)
{
dropDown.Dispose();
dropDown = null;
}
}
base.Dispose(disposing);
}
}
}
二:
ToolStrip
工具条中可以插入文本,下拉框,等,如果要插入下拉树的列表框但不可以直接插入ComboBoxTreeView,必须继承上面提到的ToolStripControlHost类,
using System;
using System.Windows;
using System.Windows.Forms;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Design;
using System.Windows.Forms.Design;
namespace WindowsApplication14
{
[DefaultProperty("Items")]
[ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability.ContextMenuStrip | (ToolStripItemDesignerAvailability.MenuStrip | ToolStripItemDesignerAvailability.ToolStrip))]
public class ToolStripComboBoxTreeView : ToolStripControlHost
{
ToolStripComboBoxTreeViewControlToolStripComboBoxTreeViewControlToolStripComboBoxTreeViewControl
public ToolStripComboBoxTreeView()
: base(ToolStripComboBoxTreeView.CreateControlInstance())
{
ToolStripComboBoxTreeView.ToolStripComboBoxTreeViewControl control =
base.Control as ToolStripComboBoxTreeView.ToolStripComboBoxTreeViewControl;
control.Owner = this;
}
private static Control CreateControlInstance()
{
ComboBox comboBox = new ToolStripComboBoxTreeViewControl();
return comboBox;
}
属性属性属性
方法方法方法
事件事件事件
}
}
using System.Windows;
using System.Windows.Forms;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Design;
using System.Windows.Forms.Design;
namespace WindowsApplication14
{
[DefaultProperty("Items")]
[ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability.ContextMenuStrip | (ToolStripItemDesignerAvailability.MenuStrip | ToolStripItemDesignerAvailability.ToolStrip))]
public class ToolStripComboBoxTreeView : ToolStripControlHost
{
ToolStripComboBoxTreeViewControlToolStripComboBoxTreeViewControlToolStripComboBoxTreeViewControl
public ToolStripComboBoxTreeView()
: base(ToolStripComboBoxTreeView.CreateControlInstance())
{
ToolStripComboBoxTreeView.ToolStripComboBoxTreeViewControl control =
base.Control as ToolStripComboBoxTreeView.ToolStripComboBoxTreeViewControl;
control.Owner = this;
}
private static Control CreateControlInstance()
{
ComboBox comboBox = new ToolStripComboBoxTreeViewControl();
return comboBox;
}
属性属性属性
方法方法方法
事件事件事件
}
}
客户端调用方法:
public static void Main(){
toolStripComboBoxTreeView1.TreeView.ImageList = this.imageList1;
TreeNode root = new TreeNode("根节点",1,2);
root.Nodes.Add("节点1");
root.Nodes.Add("节点2");
root.Nodes.Add("节点3");
root.Nodes.Add("节点4");
root.Nodes.Add("节点5");
root.Nodes.Add("节点6");
toolStripComboBoxTreeView1.TreeView.Nodes.Add(root);