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src/ScrollContainer.cpp

@@ -0,0 +1,33 @@
+#include "ScrollContainer.hpp"
+#include "src/Styles.hpp"
+#include <iostream>
+#include <memory>
+
+namespace Raven {
+
+void ScrollContainer::on_layout() {
+    if (!m_target)
+        return;
+
+    m_target->rect().set_x(-m_scroll.x());
+    m_target->rect().set_y(-m_scroll.y());
+}
+
+std::shared_ptr<Widget> ScrollContainer::make_target() {
+    m_target = add<Raven::Widget>();
+    m_target->set_style(style());
+    m_target->rect().update();
+
+    return m_target;
+}
+
+void ScrollContainer::on_mouse_button(MouseButtonEvent &event) {
+    if (event.did_scroll_down()) {
+        set_scroll(Point(m_scroll.x(), m_scroll.y() + m_scroll_step));
+    } else if (event.did_scroll_up()) {
+        set_scroll(Point(m_scroll.x(), m_scroll.y() - m_scroll_step));
+    }
+}
+
+}
+

src/ScrollContainer.hpp

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "Widget.hpp"
+#include "src/Point.hpp"
+#include <memory>
+
+namespace Raven {
+
+class ScrollContainer : public Widget {
+public:
+    ScrollContainer()
+        : Widget() {}
+
+    void set_scroll(Point scroll) { m_scroll = scroll; reflow(); }
+    Point &scroll() { return m_scroll; }
+
+    std::shared_ptr<Widget> make_target();
+    void set_target(std::shared_ptr<Widget> target) { m_target = target; }
+    std::shared_ptr<Widget> target() { return m_target; }
+
+    void set_scroll_step(double scroll_step) { m_scroll_step = scroll_step; }
+    double scroll_step() { return m_scroll_step; }
+protected:
+    void on_layout();
+    void on_mouse_button(MouseButtonEvent &event);
+private:
+    double m_scroll_step { 5.0 };
+    Point m_scroll { 0, 0 };
+    std::shared_ptr<Widget> m_target { nullptr };
+};
+
+}
+