feat(ScaleRevealer): multiple widgets

src/Dialogs/MainWindow.vala

@@ -79,7 +79,7 @@ public class Tuba.Dialogs.MainWindow: Adw.ApplicationWindow, Saveable {
 	) {
 		if (as_is && preview == null) return;
 
-		media_viewer.add_media (url, media_type, preview, pos, as_is, alt_text, user_friendly_url, stream);
+		media_viewer.add_media (url, media_type, preview, pos, as_is, alt_text, user_friendly_url, stream, source_widget);
 
 		if (!is_media_viewer_visible) {
 			media_viewer.reveal (source_widget);

src/Views/MediaViewer.vala

@@ -373,10 +373,15 @@ public class Tuba.Views.MediaViewer : Gtk.Widget, Gtk.Buildable, Adw.Swipeable {
 			enabled = true,
 			allow_mouse_drag = true
 		};
+		swipe_tracker.prepare.connect (on_swipe_tracker_prepare);
 		swipe_tracker.update_swipe.connect (on_update_swipe);
 		swipe_tracker.end_swipe.connect (on_end_swipe);
 	}
 
+	private void on_swipe_tracker_prepare (Adw.NavigationDirection direction) {
+		update_revealer_widget ();
+	}
+
 	private void on_update_swipe (double progress) {
 		this.swipe_children_opacity = 0.0;
 		this.swipe_progress = progress;
@@ -673,6 +678,7 @@ public class Tuba.Views.MediaViewer : Gtk.Widget, Gtk.Buildable, Adw.Swipeable {
 	}
 
 	private void reset_media_viewer () {
+		revealer_widgets.clear ();
 		this.fullscreen = false;
 		todo_items.clear ();
 
@@ -686,6 +692,11 @@ public class Tuba.Views.MediaViewer : Gtk.Widget, Gtk.Buildable, Adw.Swipeable {
 		revealed = false;
 	}
 
+	private void update_revealer_widget () {
+		if (revealed && revealer_widgets.has_key ((int) carousel.position))
+			scale_revealer.source_widget = revealer_widgets.get ((int) carousel.position);
+	}
+
 	private async string download_video (string url) throws Error {
 		return yield Host.download (url);
 	}
@@ -702,6 +713,7 @@ public class Tuba.Views.MediaViewer : Gtk.Widget, Gtk.Buildable, Adw.Swipeable {
 		do_todo_items ();
 	}
 
+	public Gee.HashMap<int, Gtk.Widget> revealer_widgets = new Gee.HashMap<int, Gtk.Widget> ();
 	public void add_media (
 		string url,
 		Tuba.Attachment.MediaType media_type,
@@ -710,11 +722,14 @@ public class Tuba.Views.MediaViewer : Gtk.Widget, Gtk.Buildable, Adw.Swipeable {
 		bool as_is = false,
 		string? alt_text = null,
 		string? user_friendly_url = null,
-		bool stream = false
+		bool stream = false,
+		Gtk.Widget? revealer_widget = null
 	) {
 		Item item;
 		string final_friendly_url = user_friendly_url == null ? url : user_friendly_url;
 		Gdk.Paintable? final_preview = as_is ? null : preview;
+		if (revealer_widget != null)
+			revealer_widgets.set (pos == null ? items.size : pos, revealer_widget);
 
 		if (media_type.is_video ()) {
 			var video = new Gtk.Video ();

src/Widgets/ScaleRevealer.vala

@@ -6,9 +6,29 @@ public class Tuba.Widgets.ScaleRevealer : Adw.Bin {
 
 	public signal void transition_done ();
 	public Adw.TimedAnimation animation { get; construct set; }
-	public Gtk.Widget? source_widget { get; set; }
+	private Gtk.Widget? _source_widget = null;
+	public Gtk.Widget? source_widget {
+		get {
+			return _source_widget;
+		}
+		set {
+			if (_source_widget != null)
+				_source_widget.opacity = 1.0;
+			_source_widget = value;
+			update_source_widget ();
+		}
+	}
 	public Gdk.Texture? source_widget_texture { get; set; }
 
+	private void update_source_widget () {
+		if (this.source_widget == null) {
+			source_widget_texture = null;
+		} else {
+			source_widget_texture = render_widget_to_texture (this.source_widget);
+			this.source_widget.opacity = 0.0;
+		}
+	}
+
 	private bool _reveal_child = false;
 	public bool reveal_child {
 		get {
@@ -22,13 +42,7 @@ public class Tuba.Widgets.ScaleRevealer : Adw.Bin {
 			if (value) {
 				animation.value_to = 1.0;
 				this.visible = true;
-
-				if (source_widget == null) {
-					source_widget_texture = null;
-				} else {
-					source_widget_texture = render_widget_to_texture (this.source_widget);
-					source_widget.opacity = 0.0;
-				}
+				update_source_widget ();
 			} else {
 				animation.value_to = 0.0;
 			}
@@ -119,7 +133,7 @@ public class Tuba.Widgets.ScaleRevealer : Adw.Bin {
 
 		if (source_widget == null) return;
 		if (source_widget_texture == null) {
-			warning ("The source widget texture is None, using child snapshot as fallback");
+			// The source widget texture is None, using child snapshot as fallback
 			this.snapshot_child (this.child, snapshot);
 		} else {
 			if (progress > 0.0) {