Add Container widget type, use it to make Adapter code less hacky

components/lua_ui/container.cpp

@@ -0,0 +1,35 @@
+#include "container.hpp"
+
+#include <algorithm>
+
+namespace LuaUi
+{
+    void LuaContainer::updateChildren()
+    {
+        WidgetExtension::updateChildren();
+        for (auto w : children())
+        {
+            w->onCoordChange([this](WidgetExtension* child, MyGUI::IntCoord coord)
+                { updateSizeToFit(); });
+        }
+        updateSizeToFit();
+    }
+
+    MyGUI::IntSize LuaContainer::childScalingSize()
+    {
+        return MyGUI::IntSize();
+    }
+
+    void LuaContainer::updateSizeToFit()
+    {
+        MyGUI::IntSize size;
+        for (auto w : children())
+        {
+            MyGUI::IntCoord coord = w->widget()->getCoord();
+            size.width = std::max(size.width, coord.left + coord.width);
+            size.height = std::max(size.height, coord.top + coord.height);
+        }
+        setForcedSize(size);
+        updateCoord();
+    }
+}