Merge pull request #19 from skadefro/master

Implement simple intellisense

OpenRPA.ExpressionEditor/AutoCompletionPopup.xaml

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+<ToolTip x:Class="OpenRPA.ExpressionEditor.AutoCompletionPopup"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
+             xmlns:local="clr-namespace:OpenRPA.ExpressionEditor"
+             mc:Ignorable="d" 
+             d:DesignHeight="450" d:DesignWidth="800">
+    <Grid Name="MainGrid" Width="300" Height="200" >
+        <ListBox Name="AutoCompletionListBox" IsTextSearchEnabled="True" 
+        ItemsSource="{Binding Path=.}" VirtualizingStackPanel.IsVirtualizing="True"
+        ScrollViewer.VerticalScrollBarVisibility="Auto"
+        ScrollViewer.HorizontalScrollBarVisibility="Disabled">
+            <ListBox.ItemContainerStyle>
+                <Style TargetType="{x:Type ListBoxItem}">
+                    <EventSetter Event="MouseDoubleClick" Handler="OnListBoxItemDoubleClick" />
+                </Style>
+            </ListBox.ItemContainerStyle>
+            <ListBox.ItemTemplate>
+                <DataTemplate>
+                    <TextBlock Width="Auto" Text="{Binding Path=Name}"
+                ToolTip="{Binding Path=Description}" Margin="2" />
+                </DataTemplate>
+            </ListBox.ItemTemplate>
+        </ListBox>
+    </Grid>
+</ToolTip>

OpenRPA.ExpressionEditor/AutoCompletionPopup.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace OpenRPA.ExpressionEditor
+{
+    /// <summary>
+    /// Interaction logic for AutoCompletionPopup.xaml
+    /// </summary>
+    public partial class AutoCompletionPopup : ToolTip
+    {
+        public AutoCompletionPopup()
+        {
+            InitializeComponent();
+        }
+
+        /// <summary>Occurs when an item in the auto-completion list is double clicked.</summary>
+        public event MouseButtonEventHandler ListBoxItemDoubleClick;
+
+        /// <summary>Gets or sets the selected item in the auto-completion list</summary>
+        public ExpressionNode SelectedItem
+        {
+            get { return (ExpressionNode)this.AutoCompletionListBox.SelectedItem; }
+            set { this.AutoCompletionListBox.SelectedItem = value; }
+        }
+
+        /// <summary>Gets or sets the index of the selected item in the auto-completion list.</summary>
+        public int SelectedIndex
+        {
+            get { return this.AutoCompletionListBox.SelectedIndex; }
+            set
+            {
+                // Protect against the index under- or over-ranging.
+                if (value < -1 || value > this.AutoCompletionListBox.Items.Count - 1) return;
+
+                this.AutoCompletionListBox.SelectedIndex = value;
+                this.AutoCompletionListBox.ScrollIntoView(this.AutoCompletionListBox.SelectedItem);
+            }
+        }
+
+        /// <summary>Gets the number of items in the auto-completion list.</summary>
+        public int Count
+        {
+            get { return this.AutoCompletionListBox.Items.Count; }
+        }
+        /// <summary>Occurs when an item in the auto-completion list is double-clicked.</summary>
+        /// <param name="sender">The object from which the event initiated.</param>
+        /// <param name="e">The object that contains the event data.</param>
+        protected void OnListBoxItemDoubleClick(object sender, MouseButtonEventArgs e)
+        {
+            if (this.ListBoxItemDoubleClick != null) this.ListBoxItemDoubleClick.Invoke(sender, e);
+        }
+    }
+}