RichListBox.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx35 / System.WorkflowServices / System / Workflow / Activities / Design / RichListBox.cs / 1305376 / RichListBox.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.Workflow.Activities.Design 
{
    using System; 
    using System.Collections.Generic; 
    using System.Text;
    using System.Windows.Forms; 
    using System.Drawing;
    using System.Drawing.Drawing2D;
    using System.IO;
    using System.Reflection; 
    using System.ServiceModel;
    using System.Workflow.ComponentModel.Design; 
 

    internal class RichListBox : ListBox 
    {
        ListItemViewControl activeItemDetailViewControl = null;
        ListItemViewControl activeItemViewControl = null;
        private bool editable; 
        Dictionary itemLocations;
        Dictionary listItemBitmapCache = null; 
        Dictionary listItemViewRenderers = null; 
        private IServiceProvider serviceProvider;
 
        public RichListBox()
        {
            this.DrawMode = DrawMode.OwnerDrawVariable;
            listItemBitmapCache = new Dictionary(); 
            listItemViewRenderers = new Dictionary();
            itemLocations = new Dictionary(); 
            this.DoubleBuffered = true; 
        }
 
        public bool Editable
        {
            get { return editable; }
            set { editable = value; } 
        }
 
 
        public ListItemViewControl SelectedItemViewControl
        { 
            get { return activeItemDetailViewControl; }
            set { activeItemDetailViewControl = value; }
        }
 

        public IServiceProvider ServiceProvider 
        { 
            set { serviceProvider = value; }
        } 

        public static Type GetDetailViewType(Type editableListItemType)
        {
            if (editableListItemType == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("editableListItemType"); 
            } 
            if (!typeof(object).IsAssignableFrom(editableListItemType))
            { 
                return null;
            }
            Type viewType = null;
            object[] attribs = editableListItemType.GetCustomAttributes(typeof(ListItemDetailViewAttribute), true); 
            if ((attribs != null) && (attribs.Length > 0))
            { 
                ListItemDetailViewAttribute viewAttribute = attribs[0] as ListItemDetailViewAttribute; 
                if (viewAttribute != null)
                { 
                    viewType = viewAttribute.ViewType;
                }
            }
            return viewType; 
        }
 
 
        public static Type GetItemViewType(Type editableListItemType)
        { 
            if (editableListItemType == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("editableListItemType");
            } 
            if (!typeof(object).IsAssignableFrom(editableListItemType))
            { 
                return null; 
            }
            Type viewType = null; 
            object[] attribs = editableListItemType.GetCustomAttributes(typeof(ListItemViewAttribute), true);
            if ((attribs != null) && (attribs.Length > 0))
            {
                ListItemViewAttribute viewAttribute = attribs[0] as ListItemViewAttribute; 
                if (viewAttribute != null)
                { 
                    viewType = viewAttribute.ViewType; 
                }
            } 
            return viewType;
        }

 
        protected override void OnDrawItem(DrawItemEventArgs e)
        { 
            if (e.Index < 0) 
            {
                return; 
            }
            if (Items.Count < 1)
            {
                return; 
            }
            object itemToDraw = Items[e.Index]; 
            if (itemToDraw == null) 
            {
                return; 
            }
            ListItemViewControl listItemRenderer = GetRenderer(itemToDraw);
            listItemRenderer.DrawItemState = e.State;
            if ((e.State & DrawItemState.Selected) == DrawItemState.Selected) 
            {
                if (Editable) 
                { 
                    if (activeItemViewControl != null)
                    { 
                        activeItemViewControl.Location = e.Bounds.Location;
                        activeItemViewControl.DrawItemState = e.State;
                    }
                } 

            } 
            listItemRenderer.Item = itemToDraw; 
            listItemRenderer.UpdateView();
            listItemRenderer.TabStop = false; 
            listItemRenderer.Parent = this;
            listItemRenderer.Top = -2000;
            Bitmap rendererBitmap = GetRendererBitmap(itemToDraw);
            itemLocations[itemToDraw] = e.Bounds.Location; 
            listItemRenderer.DrawToBitmap(rendererBitmap, new Rectangle(new Point(0, 0), listItemRenderer.Size));
            e.Graphics.DrawImage(rendererBitmap, e.Bounds.Location); 
        } 

        protected override void OnMeasureItem(MeasureItemEventArgs e) 
        {
            base.OnMeasureItem(e);
            if (e.Index < 0)
            { 
                return;
            } 
            if (Items.Count == 0) 
            {
                return; 
            }
            object listItem = this.Items[e.Index];
            if (listItem == null)
            { 
                return;
            } 
            ListItemViewControl listItemRenderer = GetRenderer(listItem); 
            listItemRenderer.Item = listItem;
            listItemRenderer.UpdateView(); 
            listItemRenderer.TabStop = false;
            listItemRenderer.Parent = this;
            listItemRenderer.Top = -2000;
            listItemRenderer.PerformAutoScale(); 
            e.ItemHeight = listItemRenderer.Height;
            e.ItemWidth = listItemRenderer.Width; 
        } 

 
        protected override void OnSelectedIndexChanged(EventArgs e)
        {
            try
            { 
                if (this.SelectedIndex < 0)
                { 
                    return; 
                }
                object selectedItem = Items[this.SelectedIndex]; 
                if (selectedItem == null)
                {
                    return;
                } 
                SelectedItemViewControl = Activator.CreateInstance(GetDetailViewType(selectedItem.GetType())) as ListItemViewControl;
                SelectedItemViewControl.ServiceProvider = this.serviceProvider; 
                SelectedItemViewControl.Item = selectedItem; 
                SelectedItemViewControl.DrawItemState = DrawItemState.Selected;
                SelectedItemViewControl.ItemChanged += new EventHandler(SelectedItemDetailViewControlItemChanged); 
                SelectedItemViewControl.UpdateView();
                if (Editable)
                {
                    if (activeItemViewControl != null) 
                    {
                        this.Controls.Remove(activeItemViewControl); 
                    } 
                    if (selectedItem != null)
                    { 

                        activeItemViewControl = Activator.CreateInstance(GetItemViewType(selectedItem.GetType())) as ListItemViewControl;
                        if (itemLocations.ContainsKey(selectedItem))
                        { 
                            activeItemDetailViewControl.Location = itemLocations[selectedItem];
                        } 
                        activeItemViewControl.DrawItemState = DrawItemState.Selected; 
                        activeItemViewControl.UpdateView();
                        activeItemViewControl.Item = selectedItem; 

                        this.Controls.Add(activeItemViewControl);
                    }
                } 
            }
            catch (Exception exception) 
            { 
                DesignerHelpers.ShowMessage(serviceProvider, exception.Message, DR.GetString(DR.WorkflowDesignerTitle), MessageBoxButtons.OK,
                    MessageBoxIcon.Error, MessageBoxDefaultButton.Button1); 
                throw;
            }
            base.OnSelectedIndexChanged(e);
        } 

        private ListItemViewControl GetRenderer(object listItem) 
        { 
            Type viewType = GetItemViewType(listItem.GetType());
 
            if (!listItemViewRenderers.ContainsKey(viewType.Name))
            {
                listItemViewRenderers.Add(viewType.Name, Activator.CreateInstance(viewType) as ListItemViewControl);
            } 
            ListItemViewControl listItemRenderer = listItemViewRenderers[viewType.Name];
            return listItemRenderer; 
        } 

        private Bitmap GetRendererBitmap(object listItem) 
        {
            Type viewType = GetItemViewType(listItem.GetType());
            ListItemViewControl listItemRenderer = GetRenderer(listItem);
            if (listItemRenderer == null) 
            {
                return null; 
            } 
            if (!listItemBitmapCache.ContainsKey(viewType.Name))
            { 
                listItemBitmapCache.Add(viewType.Name, new Bitmap(listItemRenderer.Size.Width, listItemRenderer.Size.Height));
            }

            Bitmap rendererBitmap = listItemBitmapCache[viewType.Name]; 
            return rendererBitmap;
        } 
 
        void SelectedItemDetailViewControlItemChanged(object sender, EventArgs e)
        { 
            this.Refresh();
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
RichListBox.cs source code in C# .NET

Source code for the .NET framework in C#

Code:

Link Menu
