From 14422eec4602a979368f85a627c714177c249d62 Mon Sep 17 00:00:00 2001
From: wcko87 <wcko87@gmail.com>
Date: Wed, 10 May 2017 10:47:29 +0800
Subject: [PATCH] Add format preview

---
 rabi_splitter_WPF/MainContext.cs           | 29 ++++++++++++++++++++++
 rabi_splitter_WPF/VariableExportSetting.cs | 13 ++++++++++
 rabi_splitter_WPF/VariableExportTab.xaml   | 20 +++++++++++----
 3 files changed, 57 insertions(+), 5 deletions(-)

diff --git a/rabi_splitter_WPF/MainContext.cs b/rabi_splitter_WPF/MainContext.cs
index db25e70..5e89d7d 100644
--- a/rabi_splitter_WPF/MainContext.cs
+++ b/rabi_splitter_WPF/MainContext.cs
@@ -6,9 +6,38 @@ using System.Linq;
 using System.Text;
 using System.Windows.Data;
 using rabi_splitter_WPF.Annotations;
+using System.Windows;
 
 namespace rabi_splitter_WPF
 {
+    [ValueConversion(typeof(bool), typeof(Visibility))]
+    public class InvertableBooleanToVisibilityConverter : IValueConverter
+    {
+        #region IValueConverter Members
+        // Code taken from http://stackoverflow.com/a/2427307
+        enum Parameter
+        {
+            VisibleWhenTrue, VisibleWhenFalse
+        }
+
+        public object Convert(object value, Type targetType, object parameter,
+            System.Globalization.CultureInfo culture)
+        {
+            var boolValue = (bool)value;
+            var direction = (Parameter)Enum.Parse(typeof(Parameter), (string)parameter);
+
+            if (direction == Parameter.VisibleWhenTrue) return boolValue ? Visibility.Visible : Visibility.Collapsed;
+            else return boolValue ? Visibility.Collapsed : Visibility.Visible;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter,
+            System.Globalization.CultureInfo culture)
+        {
+            return null;
+        }
+        #endregion
+    }
+
     [ValueConversion(typeof(bool), typeof(bool))]
     public class InverseBooleanConverter : IValueConverter
     {
diff --git a/rabi_splitter_WPF/VariableExportSetting.cs b/rabi_splitter_WPF/VariableExportSetting.cs
index 151d81c..8a05764 100644
--- a/rabi_splitter_WPF/VariableExportSetting.cs
+++ b/rabi_splitter_WPF/VariableExportSetting.cs
@@ -59,6 +59,7 @@ namespace rabi_splitter_WPF
         private string _outputFileName;
         private string _outputFormat;
         private bool _isExporting;
+        private bool _isPreviewingFormat;
 
         #region Dictionaries
         private static Dictionary<ExportableVariable, string> _variableCaptions;
@@ -89,6 +90,7 @@ namespace rabi_splitter_WPF
             _outputFileName = "";
             _outputFormat = "";
             _isExporting = false;
+            _isPreviewingFormat = false;
         }
 
         #region Parameters
@@ -126,6 +128,17 @@ namespace rabi_splitter_WPF
             }
         }
 
+        public bool IsPreviewingFormat
+        {
+            get { return _isPreviewingFormat; }
+            set
+            {
+                if (value.Equals(_isPreviewingFormat)) return;
+                _isPreviewingFormat = value;
+                OnPropertyChanged(nameof(IsPreviewingFormat));
+            }
+        }
+
         public bool IsExporting
         {
             get { return _isExporting; }
diff --git a/rabi_splitter_WPF/VariableExportTab.xaml b/rabi_splitter_WPF/VariableExportTab.xaml
index 0b14d67..85a07fd 100644
--- a/rabi_splitter_WPF/VariableExportTab.xaml
+++ b/rabi_splitter_WPF/VariableExportTab.xaml
@@ -6,6 +6,9 @@
              xmlns:local="clr-namespace:rabi_splitter_WPF"
              mc:Ignorable="d" 
              d:DesignHeight="500" d:DesignWidth="540">
+    <UserControl.Resources>
+        <local:InvertableBooleanToVisibilityConverter x:Key="InvertableBooleanToVisibilityConverter"/>
+    </UserControl.Resources>
     <DockPanel>
         <StackPanel>
             <Button Content="Add" Width="40" Height="40" DockPanel.Dock="Right" Click="AddButton_Click"/>
@@ -27,11 +30,18 @@
                         </StackPanel>
                         <DockPanel Grid.Column="1" Margin="15,0,15,0">
                             <DockPanel>
-                                <DockPanel DockPanel.Dock="Top">
-                                    <TextBlock DockPanel.Dock="Left" Text="Format"/>
-                                    <Button DockPanel.Dock="Right" Content="Default Format" Click="DefaultButton_Click" Width="120" HorizontalAlignment="Right"/>
-                                </DockPanel>
-                                <TextBox Margin="0,5,0,5" Text="{Binding Path=OutputFormat, Mode=TwoWay}" AcceptsReturn="True"/>
+                                <Grid DockPanel.Dock="Top">
+                                    <Grid.ColumnDefinitions>
+                                        <ColumnDefinition Width="6*" />
+                                        <ColumnDefinition Width="5*" />
+                                        <ColumnDefinition Width="3*" />
+                                    </Grid.ColumnDefinitions>
+                                    <TextBlock Grid.Column="0" HorizontalAlignment="Left" Text="Format"/>
+                                    <ToggleButton Grid.Column="1" Margin="0,0,5,0" Content="Preview" IsChecked="{Binding Path=IsPreviewingFormat}"/>
+                                    <Button Grid.Column="2" Content="Default" Click="DefaultButton_Click"/>
+                                </Grid>
+                                <TextBox Height="50"  DockPanel.Dock="Top" Margin="0,5,0,5" Text="{Binding Path=OutputFormat, Mode=TwoWay}" AcceptsReturn="True" Visibility="{Binding Path=IsPreviewingFormat, Converter={StaticResource InvertableBooleanToVisibilityConverter}, ConverterParameter=VisibleWhenFalse, FallbackValue=Visible}"/>
+                                <TextBlock Height="50" DockPanel.Dock="Top" Margin="0,5,0,5" Text="{Binding Path=OutputFormat, Mode=TwoWay}" Visibility="{Binding Path=IsPreviewingFormat, Converter={StaticResource InvertableBooleanToVisibilityConverter}, ConverterParameter=VisibleWhenTrue, FallbackValue=Collapsed}"/>
                             </DockPanel>
                         </DockPanel>
                         <DockPanel Grid.Column="2">