Main page now uses Frame to change views when selecting items

Backgrounds unified
Menu items can be disabled thanks to custom ListView control

ModernKeePass/Pages/GroupDetailPage.xaml

@@ -37,6 +37,7 @@
             x:Name="groupsGridView"
             AutomationProperties.AutomationId="ItemGridView"
             AutomationProperties.Name="Groups"
+            Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
             TabIndex="1"
             Grid.RowSpan="2"
             Padding="120,126,120,50"

ModernKeePass/Pages/GroupDetailPage.xaml.cs

@@ -59,13 +59,11 @@ namespace ModernKeePass.Pages
         protected override void OnNavigatedTo(NavigationEventArgs e)
         {
             navigationHelper.OnNavigatedTo(e);
-            
-            if (e.Parameter is GroupVm)
-            {
-                DataContext = e.Parameter as GroupVm;
-                groupsGridView.SelectedIndex = -1;
-                entriesListView.SelectedIndex = -1;
-            }
+
+            if (!(e.Parameter is GroupVm)) return;
+            DataContext = (GroupVm) e.Parameter;
+            groupsGridView.SelectedIndex = -1;
+            entriesListView.SelectedIndex = -1;
         }
 
         protected override void OnNavigatedFrom(NavigationEventArgs e)
@@ -78,14 +76,14 @@ namespace ModernKeePass.Pages
         private void groupsGridView_SelectionChanged(object sender, SelectionChangedEventArgs e)
         {
             var gridView = sender as GridView;
-            Frame.Navigate(typeof(GroupDetailPage), gridView.SelectedItem as GroupVm);
+            Frame.Navigate(typeof(GroupDetailPage), gridView?.SelectedItem as GroupVm);
         }
         
 
         private void entriesListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
         {
             var listView = sender as ListView;
-            Frame.Navigate(typeof(EntryDetailPage), listView.SelectedItem as EntryVm);
+            Frame.Navigate(typeof(EntryDetailPage), listView?.SelectedItem as EntryVm);
         }
     }
 }

ModernKeePass/Pages/OpenDatabasePage.xaml

@@ -0,0 +1,37 @@
+<Page
+    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:viewModels="using:ModernKeePass.ViewModels"
+    x:Class="ModernKeePass.Pages.OpenDatabasePage"
+    mc:Ignorable="d">
+    <Page.DataContext>
+        <viewModels:DatabaseVm/>
+    </Page.DataContext>
+
+    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+        <Grid.ChildrenTransitions>
+            <TransitionCollection>
+                <EntranceThemeTransition/>
+            </TransitionCollection>
+        </Grid.ChildrenTransitions>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="150" />
+            <ColumnDefinition Width="*" />
+        </Grid.ColumnDefinitions>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="*" />
+        </Grid.RowDefinitions>
+        <HyperlinkButton Grid.Row="0" Grid.ColumnSpan="2" Content="Browse files..." Click="ButtonBase_OnClick" />
+        <TextBlock Grid.Column="1" Grid.Row="0" HorizontalAlignment="Left" Visibility="{Binding SelectedVisibility}" TextWrapping="Wrap" Text="{Binding Name}" VerticalAlignment="Center" Height="auto" Width="auto" FontSize="16" Margin="10,7,0,6" />
+        <TextBlock Grid.Column="0" Grid.Row="2" HorizontalAlignment="Left" Visibility="{Binding SelectedVisibility}" TextWrapping="Wrap" Text="Password" VerticalAlignment="Center" Height="auto" Width="auto" FontSize="16" Margin="10,7,0,6" />
+        <PasswordBox Grid.Column="1" Grid.Row="2" x:Name="PasswordBox" VerticalAlignment="Top" HorizontalAlignment=" Right"  Visibility="{Binding SelectedVisibility}" Width="500" IsPasswordRevealButtonEnabled="True" Margin="0,0,10,0"/>
+        <TextBlock Grid.Column="1" Grid.Row="3" x:Name="StatusTextBlock"  Visibility="{Binding SelectedVisibility}" Height="auto" Width="auto" Foreground="#FF9E1B1B" FontSize="16" />
+        <Button Grid.Column="1" Grid.Row="4" Content="OK"  Visibility="{Binding SelectedVisibility}" HorizontalAlignment="Right" VerticalAlignment="Top" Click="OpenButton_OnClick" Margin="0,0,7,0" Width="auto"/>
+    </Grid>
+</Page>

ModernKeePass/Pages/OpenDatabasePage.xaml.cs

@@ -0,0 +1,61 @@
+using System;
+using Windows.Storage.Pickers;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Navigation;
+using ModernKeePass.Common;
+using ModernKeePass.ViewModels;
+
+// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
+
+namespace ModernKeePass.Pages
+{
+    /// <summary>
+    /// An empty page that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class OpenDatabasePage : Page
+    {
+        private Frame _mainFrame;
+
+        public OpenDatabasePage()
+        {
+            InitializeComponent();
+            DataContext = new DatabaseVm();
+        }
+
+        protected override void OnNavigatedTo(NavigationEventArgs e)
+        {
+            base.OnNavigatedTo(e);
+            _mainFrame = e.Parameter as Frame;
+        }
+
+        private async void ButtonBase_OnClick(object sender, RoutedEventArgs e)
+        {
+            var picker =
+                new FileOpenPicker
+                {
+                    ViewMode = PickerViewMode.List,
+                    SuggestedStartLocation = PickerLocationId.DocumentsLibrary
+                };
+            picker.FileTypeFilter.Add(".kdbx");
+
+            var file = await picker.PickSingleFileAsync();
+            if (file == null) return;
+            // Application now has read/write access to the picked file
+            ((App)Application.Current).Database = new DatabaseHelper(file);
+            var databaseVm = DataContext as DatabaseVm;
+            if (databaseVm == null) return;
+            databaseVm.SelectedVisibility = Visibility.Visible;
+            databaseVm.Name = file.Name;
+            databaseVm.NotifyPropertyChanged("SelectedVisibility");
+            databaseVm.NotifyPropertyChanged("Name");
+        }
+
+        private void OpenButton_OnClick(object sender, RoutedEventArgs e)
+        {
+            var app = (App)Application.Current;
+            StatusTextBlock.Text = app.Database.Open(PasswordBox.Password);
+            if (string.IsNullOrEmpty(StatusTextBlock.Text)) _mainFrame.Navigate(typeof(GroupDetailPage), app.Database.RootGroup);
+        }
+    }
+}

ModernKeePass/Pages/SaveDatabasePage.xaml

@@ -0,0 +1,28 @@
+<Page
+    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:viewModels="using:ModernKeePass.ViewModels"
+    x:Class="ModernKeePass.Pages.SaveDatabasePage"
+    mc:Ignorable="d">
+
+    <Page.DataContext>
+        <viewModels:DatabaseVm/>
+    </Page.DataContext>
+
+    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+        <Grid.ChildrenTransitions>
+            <TransitionCollection>
+                <EntranceThemeTransition/>
+            </TransitionCollection>
+        </Grid.ChildrenTransitions>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+        </Grid.RowDefinitions>
+        <HyperlinkButton Grid.Row="0" x:Name="SaveButton" Content="Save and close" Click="SaveButton_OnClick" VerticalAlignment="Top" IsEnabled="{Binding IsOpen}" />
+        <HyperlinkButton Grid.Row="1" x:Name="SaveAsButton" Content="Save as..." VerticalAlignment="Top" IsEnabled="{Binding IsOpen}" />
+
+    </Grid>
+</Page>

ModernKeePass/Pages/SaveDatabasePage.xaml.cs

@@ -0,0 +1,39 @@
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Navigation;
+using ModernKeePass.ViewModels;
+
+// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
+
+namespace ModernKeePass.Pages
+{
+    /// <summary>
+    /// An empty page that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class SaveDatabasePage : Page
+    {
+        public SaveDatabasePage()
+        {
+            this.InitializeComponent();
+            DataContext = new DatabaseVm();
+        }
+
+        protected override void OnNavigatedTo(NavigationEventArgs e)
+        {
+            base.OnNavigatedTo(e);
+            var app = (App)Application.Current;
+            if (app.Database == null) return;
+            var databaseVm = DataContext as DatabaseVm;
+            if (databaseVm == null) return;
+            databaseVm.IsOpen = app.Database.IsOpen;
+            databaseVm.NotifyPropertyChanged("IsOpen");
+        }
+
+        private void SaveButton_OnClick(object sender, RoutedEventArgs e)
+        {
+            var app = (App) Application.Current;
+            app.Database.Save();
+            app.Database.Close();
+        }
+    }
+}