ayanova7/source/GZWFControls/GZUltraComboEditor.cs

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;

namespace GZTW.WinForm.Controls
{
	/// <summary>
	/// Summary for needmoredatahandler
	/// </summary>
	public delegate void NeedMoreDataHandler();

	/// <summary>
	/// Summary description for GZUltraComboEditor.
	/// </summary>
	public class GZUltraComboEditor : Infragistics.Win.UltraWinEditors.UltraComboEditor
	{
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;
		public GZUltraComboEditor()
		{
			// This call is required by the Windows.Forms Form Designer.
			InitializeComponent();		

			//Do construction only in runtime
			//if(System.Diagnostics.Process.GetCurrentProcess().ProcessName != "devenv")// OR if (LicenseManager.UsageMode == LicenseUsageMode.Designtime) 
			if (LicenseManager.UsageMode != LicenseUsageMode.Designtime) //seems to be fastest checking method
			{
				
				if(bAllowEmptySelection)
				{
                    //Case 324
					//viEmpty=this.Items.Add(Guid.Empty,"-");
					//viEmpty.Appearance.BackColor=System.Drawing.SystemColors.GrayText;				
					//this.SelectedItem=viEmpty;

                    //10-dec-2008 commented out above and changed to this see emptyvaluelistitem for why
                    Items.Add(EmptyValueListItem);//added later was missing
                    this.SelectedItem = EmptyValueListItem;
				}

                //Case 321
                this.DropDownStyle = Infragistics.Win.DropDownStyle.DropDown;

                this.AutoCompleteMode = Infragistics.Win.AutoCompleteMode.SuggestAppend;
				this.LimitToList=true;
               

				this.SortStyle = Infragistics.Win.ValueListSortStyle.Ascending;
				this.MaxDropDownItems=25;
			}
			
		}

		#region public properties


		private Infragistics.Win.ValueListItem viEmpty=null;
        private Infragistics.Win.UltraWinEditors.UltraComboEditor ultraComboEditor1;

		/// <summary>
		/// Built in default empty value list item
		/// Used to check for selection etc
		/// not visible in property window of designer
		/// </summary>
		[Browsable(false)]
			public Infragistics.Win.ValueListItem EmptyValueListItem
		{
			get
			{
                //10-dec-2008 added this because
                //it was throwing an exception in visual studio forms designer
                //when attempt to change the AllowEmpty property from false to true
                if(viEmpty==null)
                {
                    viEmpty = new Infragistics.Win.ValueListItem(Guid.Empty, "-");
                    viEmpty.Appearance.BackColor = System.Drawing.SystemColors.GrayText;	
                }
				return viEmpty;
			}
		}

		private bool bAllowEmptySelection=true;
		/// <summary>
		/// Allow or disallow guid.empty as an option
		/// </summary>
		[Bindable(true), Category("GZ Options"), 
		DefaultValue(true),
		Description("False=will not offer an empty choice (Guid.Empty) or allow one.  True=will have by default a Guid.Empty selection.")]
		public bool AllowEmptySelection
		{
			get
			{
				return bAllowEmptySelection;
			}
			set
			{
				bAllowEmptySelection=value;
				if(value==false)
				{//remove empty value from list
					if(viEmpty!=null)
                    this.Items.Remove(viEmpty);			
				}
				else
				{//Put empty value back in list if necessary
					if(!this.Items.Contains(viEmpty))
						this.Items.Add(this.viEmpty);
				}
			}
		}
		#endregion

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{


            //this crept up for no apparent reason during development of v7
           //when the clientselector form is disposed of while in a workorder it throws the illegal cross thread call in base.dispose below.

			if( disposing )
			{
				if( components != null )
					components.Dispose();
			}

			base.Dispose( disposing );
		}

		#region Component 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()
		{
            this.ultraComboEditor1 = new Infragistics.Win.UltraWinEditors.UltraComboEditor();
            ((System.ComponentModel.ISupportInitialize)(this.ultraComboEditor1)).BeginInit();
            ((System.ComponentModel.ISupportInitialize)(this)).BeginInit();
            this.SuspendLayout();
            // 
            // ultraComboEditor1
            // 
            this.ultraComboEditor1.Location = new System.Drawing.Point(0, 0);
            this.ultraComboEditor1.Name = "ultraComboEditor1";
            this.ultraComboEditor1.Size = new System.Drawing.Size(144, 21);
            this.ultraComboEditor1.TabIndex = 0;
            this.ultraComboEditor1.Text = "ultraComboEditor1";
            ((System.ComponentModel.ISupportInitialize)(this.ultraComboEditor1)).EndInit();
            ((System.ComponentModel.ISupportInitialize)(this)).EndInit();
            this.ResumeLayout(false);

		}
		#endregion

		protected override void OnPaint(PaintEventArgs pe)
		{
			// 

			// Calling the base class OnPaint
			base.OnPaint(pe);
		}

		


		#region Events and customization
		
		/// <summary>
		/// Get me some data...STAT!
		/// </summary>
		public event NeedMoreDataHandler NeedMoreData;

		/// <summary>
		/// Need more data so get it.
		/// </summary>
		protected virtual void OnNeedMoreData()
		{            
            //case 1484
            if (this.ReadOnly || this.Enabled == false)
                return;

			if(NeedMoreData!=null)
			{NeedMoreData();}

		}


        //Added for infragistics 7.2 upgrade as argument signature of event
        //has apparently changed from what it used to be below
        protected override void OnBeforeDropDown(CancelEventArgs args)
        {
            //case 1484
            if (this.ReadOnly || this.Enabled == false)
                return;

            if (this.Items.Count < 3)
                OnNeedMoreData();
            base.OnBeforeDropDown(args);
        }

        //protected override void OnBeforeDropDown(object sender, CancelEventArgs args)
        //{
        //    if(this.Items.Count < 3)
        //        OnNeedMoreData();

        //    base.OnBeforeDropDown (sender, args);
        //}


		/// <summary>
		/// Override onkeydown
		/// Get rid of leading space so autocomplete will work
		/// Fill list if it's empty
		/// </summary>
		/// <param name="e"></param>
		protected override void OnKeyDown(KeyEventArgs e)
		{
			if(this.ReadOnly || this.Enabled==false) 
				return;

           

			if(e.KeyData!= Keys.Tab)
			{
                //Case 321
                //commented out the following, not required with changes for case 321

				//remove leading space unless that's the character typed
                //if(e.KeyData!=Keys.Space)
                //    this.Text=this.Text.TrimStart(' ');

				if(this.Items.Count < 3)
					OnNeedMoreData();

			}
			else
			{
				if(bAllowEmptySelection)
				{
					//check if the user wiped out all the text thus
					//indicating no selection and if so then 
					//force the empty selection automatically
					if(this.Text=="") 
					{
						this.SelectedItem=this.viEmpty;
					}
				}
			}

			

			base.OnKeyDown (e);
		}


		
/// <summary>
/// Clears all but the default guid empty item from 
/// the value item list unless empty items are not allowed
/// in which case it clears them all
/// </summary>
		public void ClearList()
		{

			this.Items.Clear();
			if(bAllowEmptySelection)
				viEmpty=this.Items.Add(Guid.Empty,"-");//Case 324



		}




		#endregion

      
      




	}
}