Draw and event position relative to parent (for pages)

src/gui/ScrollablePage.cpp

@@ -0,0 +1,53 @@
+#include "../../include/gui/ScrollablePage.hpp"
+#include "../../include/Theme.hpp"
+
+#include <mglpp/graphics/Rectangle.hpp>
+#include <mglpp/window/Window.hpp>
+
+namespace gsr {
+    ScrollablePage::ScrollablePage(mgl::vec2f size) : size(size) {}
+
+    bool ScrollablePage::on_event(mgl::Event &event, mgl::Window &window, mgl::vec2f offset) {
+        const mgl::vec2f draw_pos = position + offset;
+        offset = draw_pos + mgl::vec2f(0.0f, get_border_size(window)).floor();
+
+        // Process widgets by visibility (backwards)
+        for(auto it = widgets.rbegin(), end = widgets.rend(); it != end; ++it) {
+            if(!(*it)->on_event(event, window, offset))
+                return false;
+        }
+
+        return true;
+    }
+
+    void ScrollablePage::draw(mgl::Window &window, mgl::vec2f offset) {
+        const mgl::vec2f draw_pos = position + offset;
+        offset = draw_pos + mgl::vec2f(0.0f, get_border_size(window)).floor();
+
+        mgl::Rectangle background(size);
+        background.set_position(draw_pos);
+        background.set_color(get_theme().scrollable_page_bg_color);
+        window.draw(background);
+
+        mgl::Rectangle border(mgl::vec2f(size.x, get_border_size(window)).floor());
+        border.set_position(draw_pos);
+        border.set_color(get_theme().tint_color);
+        window.draw(border);
+
+        for(auto &widget : widgets) {
+            if(widget->move_to_top) {
+                widget->move_to_top = false;
+                std::swap(widget, widgets.back());
+            }
+            widget->draw(window, offset);
+        }
+
+        for(auto &widget : widgets) {
+            widget->draw(window, offset);
+        }
+    }
+
+    float ScrollablePage::get_border_size(mgl::Window &window) const {
+        return window.get_size().y * 0.004f;
+    }
+}