ui pipeline

ui/view.sx

@@ -0,0 +1,30 @@
+#import "ui/types.sx";
+#import "ui/render.sx";
+#import "ui/events.sx";
+
+View :: protocol {
+    // Measure: given a size proposal, return desired size
+    size_that_fits :: (proposal: ProposedSize) -> Size;
+
+    // Place: position children within the given bounds
+    layout :: (bounds: Frame);
+
+    // Render: emit render nodes
+    render :: (ctx: *RenderContext, frame: Frame);
+
+    // Event handling: return true if the event was consumed
+    handle_event :: (event: *Event, frame: Frame) -> bool;
+}
+
+// A child view with its computed frame (set during layout)
+ViewChild :: struct {
+    view: View;
+    computed_frame: Frame;
+
+    make :: (view: View) -> ViewChild {
+        ViewChild.{
+            view = view,
+            computed_frame = Frame.zero()
+        };
+    }
+}