CheckedListBox.SelectedIndexChanged : CheckedListBox « System.Windows.Forms « C# / C Sharp by API

1. C# / C Sharp by API
2. System.Windows.Forms
3. CheckedListBox

CheckedListBox.SelectedIndexChanged

  
using System;
using System.Windows.Forms;
using System.Drawing;
using System.ComponentModel;
 
public class CheckedListBoxDemo:Form{
  CheckedListBox FavLangs;
  GroupBox grpControls;
  Button AddValue;
  Button EditValue;
  Button DeleteValue;
  Button ShowValues;
  TextBox OldValue;
  TextBox NewValue;
  Label OldCaption;
  Label NewCaption;
  CheckBox chkAll;
 
  public CheckedListBoxDemo(){
    grpControls=new GroupBox();
    grpControls.Text="CheckedListBox Demo";
 
    AddValue=new Button();
    AddValue.Text="&Add";
    AddValue.Click+=new EventHandler(Add_Click);
    
    EditValue=new Button();
    EditValue.Text="&Edit";
    EditValue.Click+=new EventHandler(Edit_Click);
    
    DeleteValue=new Button();
    DeleteValue.Text="&Delete";
    DeleteValue.Click+=new EventHandler(Delete_Click);
    
    ShowValues=new Button();
    ShowValues.Text="&Show";
    //ShowValues.Click+=new EventHandler(ShowValues_Click);
    ShowValues.Click+=new EventHandler(Checked_Changed);
    
    OldValue=new TextBox();
    OldValue.ReadOnly=true;
    NewValue=new TextBox();
 
    OldCaption=new Label();
    OldCaption.Text="Old Value:";
    NewCaption=new Label();
    NewCaption.Text="New Value:";

    chkAll=new CheckBox();
    chkAll.Text="Check/UnCheck All";
    chkAll.CheckedChanged+= new EventHandler(Checked_Changed);
    chkAll.Width=175;
 
    OldCaption.Location=new Point(15,15);
    PositionControl(OldCaption,OldValue,true);
    PositionControl(OldCaption,NewCaption,false);
    PositionControl(OldValue,NewValue,false);
    PositionControl(NewCaption,AddValue,false);
    PositionControl(AddValue,EditValue,true);
    PositionControl(EditValue,DeleteValue,true);
    PositionControl(DeleteValue,ShowValues,true);
    PositionControl(AddValue,chkAll,false);
 
    grpControls.Controls.AddRange(new Control[]{OldCaption,OldValue,NewCaption,NewValue,AddValue,EditValue,DeleteValue,ShowValues,chkAll});
    grpControls.Size=new Size(450,200);
 
    FavLangs=new CheckedListBox();
    FavLangs.Location=new Point(10,10);
    FavLangs.SelectedIndexChanged+=new EventHandler(SelectedIndex_Changed);
 
    grpControls.Location=new Point(FavLangs.Left+FavLangs.Width+20,FavLangs.Top);
    this.Controls.AddRange(new Control[]{FavLangs,grpControls});
  }
 
  private void PositionControl(Control source,Control destination,bool CanPlaceHorizontal)
  {
    if(CanPlaceHorizontal){
      destination.Location=new Point(source.Left+source.Width+20,source.Top);
    }else{
      destination.Location=new Point(source.Left,source.Top+source.Height+20);      
    }
  }
 
  private void Add_Click(object sender,EventArgs e){
    ((Button)sender).Text = "aaa";
    
    if(NewValue.Text.Trim()!=""){
      FavLangs.Items.Add(NewValue.Text);
    }else{
      MessageBox.Show("Enter a Value to Add");
    }
  }
 
  private void SelectedIndex_Changed(object sender,EventArgs e){
    OldValue.Text=FavLangs.Items[FavLangs.SelectedIndex].ToString();
  }
 
  private void Edit_Click(object sender,EventArgs e){
    if(FavLangs.SelectedIndex==-1){
      MessageBox.Show("Select a Item to Edit");
    } else{
     if(NewValue.Text.Trim()!=""){
        FavLangs.Items[FavLangs.SelectedIndex]=NewValue.Text;
     }
      else
      {
        MessageBox.Show("Enter a Value to Edit");
      }            
    }
  }
 
  private void Delete_Click(object sender,EventArgs e)
  {
    if(FavLangs.SelectedIndex!=-1)
    {
      FavLangs.Items.RemoveAt(FavLangs.SelectedIndex);
    }
    else
    {
      MessageBox.Show("Select a Item to Delete");
    }
  }
 
  private void ShowValues_Click(object sender,EventArgs e){
    string SelectedValues="The following value(s) are Selected:\n" + new String('-',48) + "\n";
    for(int i=0;i<FavLangs.CheckedItems.Count;i++){
      SelectedValues+=FavLangs.CheckedItems[i].ToString() + "\n";
    }
    MessageBox.Show(SelectedValues);
  }
 
  private void Checked_Changed(object sender,EventArgs e){
      for(int i=0;i<FavLangs.Items.Count;i++){
          FavLangs.SetItemChecked(i,chkAll.Checked);
      }    
  }
 
  public static void Main(){
      Application.Run(new CheckedListBoxDemo());
  }
}

   
    
  

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