Add BoxContainerAlignment

Author: floppyhammer

src/nodes/ui/container/box_container.cpp

@@ -15,6 +15,10 @@ void BoxContainer::adjust_layout() {
 
     // In the first loop, we need to do some calculation.
     for (auto &ui_child : ui_children) {
+        if (!ui_child->get_visibility()) {
+            continue;
+        }
+        
         if (horizontal) {
             if (ui_child->container_sizing.expand_h()) {
                 expanding_children.push_back(ui_child);
@@ -42,10 +46,18 @@ void BoxContainer::adjust_layout() {
     uint32_t expanding_child_count = expanding_children.size();
 
     // FIXME: same expanding space is not optimal.
-    float extra_space_for_each_expanding_child = available_space_for_expanding / (float)expanding_child_count;
+    float extra_space_for_each_expanding_child = 0;
+    if (expanding_child_count > 0) {
+        extra_space_for_each_expanding_child = available_space_for_expanding / (float)expanding_child_count;
+    }
 
     float pos_shift = 0;
 
+    // When there's at least one expanding child, the alignment doesn't matter because there's no space for it to make a difference.
+    if (expanding_child_count == 0 && alignment == BoxContainerAlignment::End) {
+        pos_shift = available_space_for_expanding;
+    }
+
     // In the second loop, we set child sizes and positions.
     for (auto &ui_child : ui_children) {
         auto child_min_size = ui_child->get_effective_minimum_size();
@@ -198,4 +210,8 @@ void BoxContainer::set_separation(float new_separation) {
     separation = new_separation;
 }
 
+void BoxContainer::set_alignment(BoxContainerAlignment new_alignment) {
+    alignment = new_alignment;
+}
+
 } // namespace revector

src/nodes/ui/container/box_container.h

@@ -4,14 +4,22 @@
 
 namespace revector {
 
+enum struct BoxContainerAlignment {
+    Begin,
+    End,
+};
+
 class BoxContainer : public Container {
 public:
+
     void adjust_layout() override;
 
     void calc_minimum_size() override;
 
     void set_separation(float new_separation);
 
+    void set_alignment(BoxContainerAlignment new_alignment);
+
 protected:
     BoxContainer() {
     }
@@ -21,6 +29,8 @@ class BoxContainer : public Container {
 
     /// Direction for organizing UI children.
     bool horizontal = true;
+
+    BoxContainerAlignment alignment = BoxContainerAlignment::Begin;
 };
 
 class HBoxContainer : public BoxContainer {