Add widgets for settings page, add list to auto position widgets

src/gui/List.cpp

@@ -0,0 +1,85 @@
+#include "../../include/gui/List.hpp"
+
+namespace gsr {
+    // TODO: Make this modifiable, multiple by window size.
+    // TODO: Add homogeneous option, using a specified max size of this list.
+    static const mgl::vec2f spacing(30.0f, 10.0f);
+
+    List::List(Orientation orientation) : orientation(orientation) {}
+    
+    bool List::on_event(mgl::Event &event, mgl::Window &window, mgl::vec2f) {
+        if(selected_child_widget) {
+            if(!selected_child_widget->on_event(event, window, mgl::vec2f(0.0f, 0.0f)))
+                return false;
+        }
+
+        // Process widgets by visibility (backwards)
+        for(auto it = widgets.rbegin(), end = widgets.rend(); it != end; ++it) {
+            // Ignore offset because widgets are positioned with offset in ::draw, this solution is simpler
+            if(it->get() != selected_child_widget) {
+                if(!(*it)->on_event(event, window, mgl::vec2f(0.0f, 0.0f)))
+                    return false;
+            }
+        }
+
+        return true;
+    }
+
+    void List::draw(mgl::Window &window, mgl::vec2f offset) {
+        mgl::vec2f draw_pos = position + offset;
+
+        // TODO: Do same vertical/horizontal alignment for items
+        switch(orientation) {
+            case Orientation::VERTICAL: {
+                for(auto &widget : widgets) {
+                    widget->set_position(draw_pos);
+                    if(widget.get() != selected_child_widget)
+                        widget->draw(window, mgl::vec2f(0.0f, 0.0f));
+                    draw_pos.y += widget->get_size().y + spacing.y;
+                }
+                break;
+            }
+            case Orientation::HORIZONTAL: {
+                for(auto &widget : widgets) {
+                    widget->set_position(draw_pos);
+                    if(widget.get() != selected_child_widget)
+                        widget->draw(window, mgl::vec2f(0.0f, 0.0f));
+                    draw_pos.x += widget->get_size().x + spacing.x;
+                }
+                break;
+            }
+        }
+
+        if(selected_child_widget)
+            selected_child_widget->draw(window, mgl::vec2f(0.0f, 0.0f));
+    }
+
+    void List::add_widget(std::unique_ptr<Widget> widget) {
+        widget->parent_widget = this;
+        widgets.push_back(std::move(widget));
+    }
+
+    // TODO: Cache result
+    mgl::vec2f List::get_size() {
+        mgl::vec2f size;
+        switch(orientation) {
+            case Orientation::VERTICAL: {
+                for(auto &widget : widgets) {
+                    const auto widget_size = widget->get_size();
+                    size.x = std::max(size.x, widget_size.x);
+                    size.y += widget_size.y + spacing.y;
+                }
+                break;
+            }
+            case Orientation::HORIZONTAL: {
+                for(auto &widget : widgets) {
+                    const auto widget_size = widget->get_size();
+                    size.x += widget_size.x + spacing.x;
+                    size.y = std::max(size.y, widget_size.y);
+                }
+                break;
+            }
+        }
+        return size;
+    }
+}