Add a button to sort photos by date.

Most of the time they're already in order, but if photos were
added in batches, or from different cameras, they might not be.

Author: adam-azarchs

PhotoTagger.Wpf/PhotoList.xaml.cs

@@ -38,7 +38,7 @@ public ObservableCollection<Photo> Photos {
         }
 
         public static readonly DependencyProperty PhotosProperty =
-            DependencyProperty.Register("Photos",
+            DependencyProperty.Register(nameof(Photos),
                 typeof(ObservableCollection<Photo>), typeof(PhotoList));
 
 

PhotoTagger.Wpf/ValueConverters.cs

@@ -10,31 +10,57 @@
 namespace PhotoTagger.Wpf {
     [ValueConversion(typeof(IReadOnlyList<Photo>), typeof(Visibility))]
     [ValueConversion(typeof(int), typeof(Visibility))]
+    [ValueConversion(typeof(IReadOnlyList<Photo>), typeof(bool))]
+    [ValueConversion(typeof(int), typeof(bool))]
     public class ElementCountToVisibilityValueConverter : IValueConverter {
         public object Convert(object value, Type targetType, object parameter,
               CultureInfo culture) {
             if (value is IReadOnlyList<Photo> list) {
                 if (parameter is int desiredCount) {
                     if (list.Count == desiredCount) {
-                        return Visibility.Visible;
+                        if (targetType == typeof(Visibility)) {
+                            return Visibility.Visible;
+                        } else {
+                            return true;
+                        }
                     }
                 } else if (list.Count > 1) {
-                    return Visibility.Visible;
+                    if (targetType == typeof(Visibility)) {
+                        return Visibility.Visible;
+                    } else {
+                        return true;
+                    }
                 }
             } else if (value is int count) {
                 if (parameter is int desiredCount) {
                     if (count == desiredCount) {
-                        return Visibility.Visible;
+                        if (targetType == typeof(Visibility)) {
+                            return Visibility.Visible;
+                        } else {
+                            return true;
+                        }
                     }
                 } else if (parameter is IConvertible para) {
                     if (para.ToInt32(CultureInfo.InvariantCulture) == count) {
-                        return Visibility.Visible;
+                        if (targetType == typeof(Visibility)) {
+                            return Visibility.Visible;
+                        } else {
+                            return true;
+                        }
                     }
                 } else if (count > 1) {
-                    return Visibility.Visible;
+                    if (targetType == typeof(Visibility)) {
+                        return Visibility.Visible;
+                    } else {
+                        return true;
+                    }
                 }
             }
-            return Visibility.Collapsed;
+            if (targetType == typeof(Visibility)) {
+                return Visibility.Collapsed;
+            } else {
+                return false;
+            }
         }
 
         public object ConvertBack(object value, Type targetType,

PhotoTagger/TaggerWindow.xaml

@@ -51,6 +51,18 @@
             <StackPanel Grid.Row="1">
                 <Button Content="Add images..."
                         Click="addImagesEvent" />
+                <Button Click="sortImagesEvent">
+                    <Button.Content>
+                        Sort by date
+                    </Button.Content>
+                    <Button.IsEnabled>
+                        <Binding Path="Photos.Count"
+                             ElementName="window"
+                             Converter="{StaticResource ElementCountToVisibilityValueConverter}"
+                             Mode="OneWay">
+                        </Binding>
+                    </Button.IsEnabled>
+                </Button>
                 <Button Content="Commit changes" Name="commitButton"
                         IsEnabled="False" Click="commitEvent" />
                 <Button Content="Close" Click="closeSelectedEvent"

PhotoTagger/TaggerWindow.xaml.cs

@@ -22,6 +22,9 @@ public TaggerWindow() {
         }
 
         void photoCollectionChanged(object sender, NotifyCollectionChangedEventArgs e) {
+            if (e.Action == NotifyCollectionChangedAction.Move) {
+                return;
+            }
             if (e.OldItems != null) {
                 foreach (var item in e.OldItems) {
                     if (item is Photo photo) {
@@ -166,5 +169,12 @@ private void onFilesDrop(object sender, DragEventArgs e) {
             }
             addImages(files);
         }
+
+        private void sortImagesEvent(object sender, RoutedEventArgs e) {
+            Photos.CollectionChanged -= photoCollectionChanged;
+            Photos = new ObservableCollection<Photo>(Photos.OrderBy(
+                p => p.DateTaken ?? DateTime.MaxValue));
+            Photos.CollectionChanged += photoCollectionChanged;
+        }
     }
 }