add a little progress dialog while downloading the database

EDDB/API.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Threading.Tasks;
 using System.IO;
 using System.Net;
 using System.Collections.Generic;
@@ -17,10 +18,14 @@ namespace NonaBGS.EDDB {
         private string stations_file_short = null;
 
         public delegate void DatabaseAvailableDelegate();
+        public delegate void DatabaseUpdateProgressDelegate();
 
         public event DatabaseAvailableDelegate SystemsAvailable;
         public event DatabaseAvailableDelegate StationsAvailable;
 
+        public event DatabaseUpdateProgressDelegate DatabaseUpdateProgress;
+        public event DatabaseUpdateProgressDelegate DatabaseUpdateFinished;
+
         public string SystemsFile => systems_file;
         public string StationsFile => stations_file;
         public string StationsFileShort => stations_file_short;
@@ -39,14 +44,26 @@ namespace NonaBGS.EDDB {
             systems_file = Path.Combine(this.cache_folder, "systems_populated.json");
             stations_file = Path.Combine(this.cache_folder, "stations.json");
             stations_file_short = Path.Combine(this.cache_folder, "stations_short.json");
+
+            this.StationsAvailable += API_StationsAvailable;
+        }
+
+        private void API_StationsAvailable() {
+            TranslateStations();
+            DatabaseUpdateFinished?.Invoke();
         }
 
         private void DownloadFile(string url, string file, DatabaseAvailableDelegate notifier) {
             WebClient client = new WebClient();
             client.DownloadFileCompleted += Client_DownloadFileCompleted;
+            client.DownloadProgressChanged += Client_DownloadProgressChanged;
             client.DownloadFileAsync(new Uri(url), file, notifier);
         }
 
+        private void Client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e) {
+            DatabaseUpdateProgress?.Invoke();
+        }
+
         private void Client_DownloadFileCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e) {
             DatabaseAvailableDelegate notifier = e.UserState as DatabaseAvailableDelegate;
             notifier?.Invoke();
@@ -69,7 +86,6 @@ namespace NonaBGS.EDDB {
             using (var str = new StreamReader(StationsFile)) {
                 using (var reader = new JsonTextReader(str)) {
                     JArray obj = (JArray)JToken.ReadFrom(reader);
-                    
 
                     foreach (JObject child in obj.Children<JObject>()) {
                         int system_id = child.Value<int>("system_id");
@@ -79,6 +95,8 @@ namespace NonaBGS.EDDB {
                             systems.Add(system_id, new List<string>());
                         }
 
+                        DatabaseUpdateProgress?.Invoke();
+
                         systems[system_id].Add(name);
                     }
                 }

MainWindow.xaml.cs

@@ -236,8 +236,9 @@ namespace NonaBGS {
                 return;
             }
 
-            // Force download
-            api.Download(true);
+            ProgressDialog dialog = new ProgressDialog(api);
+            dialog.StartDownload();
+            dialog.ShowDialog();
         }
     }
 }

ProgressDialog.xaml

@@ -0,0 +1,21 @@
+<Window x:Class="NonaBGS.ProgressDialog"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:NonaBGS"
+        mc:Ignorable="d"
+        Title="Progress" Height="100" Width="450">
+    <Grid>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="*" />
+        </Grid.ColumnDefinitions>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+        </Grid.RowDefinitions>
+        <Label Content="Downloading EDDB databases might take a while, please be patient." Grid.Row="0" Grid.Column="0" HorizontalAlignment="Center" Margin="0,0,0,0" VerticalAlignment="Top"/>
+        <ProgressBar x:Name="progress" Height="25" Margin="10,10" Grid.Row="1" Grid.Column="0" VerticalAlignment="Top" Width="Auto" IsIndeterminate="True"/>
+    </Grid>
+</Window>

ProgressDialog.xaml.cs

@@ -0,0 +1,30 @@
+using System.Windows;
+using NonaBGS.EDDB;
+
+namespace NonaBGS {
+    /// <summary>
+    /// Interaction logic for Window1.xaml
+    /// </summary>
+    public partial class ProgressDialog : Window {
+        private readonly API api = null;
+
+        public ProgressDialog(API api) {
+            InitializeComponent();
+            this.api = api;
+            this.api.DatabaseUpdateFinished += Api_DatabaseUpdateFinished;
+            this.api.DatabaseUpdateProgress += Api_DatabaseUpdateProgress;
+        }
+
+        private void Api_DatabaseUpdateProgress() {
+            progress.Value = (progress.Value + 1) % 100;
+        }
+
+        private void Api_DatabaseUpdateFinished() {
+            Close();
+        }
+
+        public void StartDownload() {
+            api.Download(true);
+        }
+    }
+}

nonabgs.csproj

@@ -86,6 +86,9 @@
     <Compile Include="Util\AppConfig.cs" />
     <Compile Include="Util\Config.cs" />
     <Compile Include="EDDB\API.cs" />
+    <Compile Include="ProgressDialog.xaml.cs">
+      <DependentUpon>ProgressDialog.xaml</DependentUpon>
+    </Compile>
     <Page Include="MainWindow.xaml">
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
@@ -113,6 +116,10 @@
       <DependentUpon>MainWindow.xaml</DependentUpon>
       <SubType>Code</SubType>
     </Compile>
+    <Page Include="ProgressDialog.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Properties\AssemblyInfo.cs">