initial scaffolding for inverted, custom message list

src/message-list/message-list-view.vala

@@ -0,0 +1,73 @@
+using Adw;
+using Gtk;
+
+public class MessageListView : Adw.Bin
+{
+    private Adw.ToolbarView container;
+
+    private MessageDrawingArea message_drawing_area = new MessageDrawingArea();
+    private ScrolledWindow scrolled_window = new ScrolledWindow();
+
+    public MessageListView(MessageListModel model) {
+        container = new Adw.ToolbarView();
+        set_child(container);
+
+        scrolled_window.set_child(message_drawing_area);
+        scrolled_window.add_css_class("message-list-scroller");
+        container.set_content(scrolled_window);
+
+        var header_bar = new Adw.HeaderBar();
+        header_bar.set_title_widget(new Label("Messages"));
+        container.add_top_bar(header_bar);
+    }
+}
+
+
+private class MessageDrawingArea : Widget {
+    public MessageDrawingArea() {
+    }
+
+    public override SizeRequestMode get_request_mode() {
+        return SizeRequestMode.HEIGHT_FOR_WIDTH;
+    }
+    
+    public override void measure(Orientation orientation, int for_size, out int minimum, out int natural, out int minimum_baseline, out int natural_baseline) {
+        GLib.message("Measure orientation: %s, for_size: %d", orientation.to_string(), for_size);
+
+        if (orientation == Orientation.HORIZONTAL) {
+            // Horizontal, so we take up the full width provided
+            minimum = 0;
+            natural = for_size;
+        } else {
+            GLib.message("Vertical measure for width: %d", for_size);
+            minimum = 1500;
+            natural = 1500;
+        }
+        
+        minimum_baseline = -1;
+        natural_baseline = -1;
+    }
+    
+    public override void snapshot(Snapshot snapshot) {
+        var width = get_width();
+        var height = get_height();
+
+        GLib.message("Snapshot width: %d, height: %d", width, height);
+
+        var rect = Graphene.Rect().init(0, 0, width, height);
+        snapshot.append_color({1.0f, 0.0f, 0.0f, 1.0f}, rect);
+
+        // Create a text layout
+        var layout = create_pango_layout("Hello World!");
+        layout.set_width(width * Pango.SCALE);
+        
+        // Set text attributes
+        var font_desc = Pango.FontDescription.from_string("Sans 14");
+        layout.set_font_description(font_desc);
+
+        // Draw the text in white
+        snapshot.append_layout(layout, Gdk.RGBA() { red = 1.0f, green = 1.0f, blue = 1.0f, alpha = 1.0f });
+    }
+}
+
+