TreeView in Winforms and focus problem
- by Marcus
Hi,
Can anyone please explain to my why the form in the code below gets out of focus when selecting a treenode in the tree? What should happen is that the form/button should get the focus when the tree disappears like the listview example but it doesn't.
Code example:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace FocusTest
{
public partial class Form1 : Form
{
#region Generated
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
System.Windows.Forms.ListViewItem listViewItem1 = new System.Windows.Forms.ListViewItem("Item1");
System.Windows.Forms.ListViewItem listViewItem2 = new System.Windows.Forms.ListViewItem("Item2");
System.Windows.Forms.ListViewItem listViewItem3 = new System.Windows.Forms.ListViewItem("Item3");
System.Windows.Forms.TreeNode treeNode1 = new System.Windows.Forms.TreeNode("Node0");
System.Windows.Forms.TreeNode treeNode2 = new System.Windows.Forms.TreeNode("Node1");
System.Windows.Forms.TreeNode treeNode3 = new System.Windows.Forms.TreeNode("Node2");
this.button1 = new System.Windows.Forms.Button();
this.listView1 = new System.Windows.Forms.ListView();
this.button2 = new System.Windows.Forms.Button();
this.treeView1 = new System.Windows.Forms.TreeView();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(12, 12);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(75, 23);
this.button1.TabIndex = 0;
this.button1.Text = "button1";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// listView1
//
this.listView1.Items.AddRange(new System.Windows.Forms.ListViewItem[] {
listViewItem1,
listViewItem2,
listViewItem3
});
this.listView1.Location = new System.Drawing.Point(12, 41);
this.listView1.Name = "listView1";
this.listView1.Size = new System.Drawing.Size(121, 97);
this.listView1.TabIndex = 1;
this.listView1.UseCompatibleStateImageBehavior = false;
this.listView1.Visible = false;
this.listView1.SelectedIndexChanged += new System.EventHandler(this.listView1_SelectedIndexChanged);
this.listView1.View = View.List;
//
// button2
//
this.button2.Location = new System.Drawing.Point(310, 11);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(75, 23);
this.button2.TabIndex = 2;
this.button2.Text = "button2";
this.button2.UseVisualStyleBackColor = true;
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// treeView1
//
this.treeView1.Location = new System.Drawing.Point(310, 41);
this.treeView1.Name = "treeView1";
treeNode1.Name = "Node0";
treeNode1.Text = "Node0";
treeNode2.Name = "Node1";
treeNode2.Text = "Node1";
treeNode3.Name = "Node2";
treeNode3.Text = "Node2";
this.treeView1.Nodes.AddRange(new System.Windows.Forms.TreeNode[] {
treeNode1,
treeNode2,
treeNode3});
this.treeView1.Size = new System.Drawing.Size(121, 97);
this.treeView1.TabIndex = 3;
this.treeView1.Visible = false;
this.treeView1.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.treeView1_AfterSelect);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(760, 409);
this.Controls.Add(this.treeView1);
this.Controls.Add(this.button2);
this.Controls.Add(this.listView1);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.Button button1;
private System.Windows.Forms.ListView listView1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.TreeView treeView1;
#endregion
public Form1()
{
InitializeComponent();
}
#region TreeView
private void button2_Click(object sender, EventArgs e)
{
ToggleTreeView();
}
private void ToggleTreeView()
{
if (treeView1.Visible)
{
Controls.Remove(treeView1);
treeView1.Visible = false;
}
else
{
Controls.Add(treeView1);
treeView1.Size = new Size(300, 400);
treeView1.Location = PointToClient(PointToScreen(new System.Drawing.Point(button2.Location.X, button2.Location.Y + button2.Height)));
this.treeView1.BringToFront();
treeView1.Visible = true;
treeView1.Select();
}
}
private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
{
ToggleTreeView();
}
#endregion
#region ListView
private void button1_Click(object sender, EventArgs e)
{
ToggleListView();
}
private void ToggleListView()
{
if (listView1.Visible)
{
Controls.Remove(listView1);
listView1.Visible = false;
}
else
{
Controls.Add(listView1);
listView1.Size = new Size(300, 400);
listView1.Location = PointToClient(PointToScreen(new System.Drawing.Point(button1.Location.X, button1.Location.Y + button1.Height)));
this.listView1.BringToFront();
listView1.Visible = true;
listView1.Select();
}
}
private void listView1_SelectedIndexChanged(object sender, EventArgs e)
{
if (listView1.Visible)
ToggleListView();
}
#endregion
}
}
