rename parent to m_parent and add floating panel class

src/node_panel_floating.cpp

@@ -0,0 +1,68 @@
+#include "pch.h"
+#include "node_panel_floating.h"
+
+Node* NodePanelFloating::clone_instantiate() const
+{
+    return new this_class;
+}
+
+void NodePanelFloating::clone_finalize(Node* dest) const
+{
+    parent::clone_finalize(dest);
+    auto n = static_cast<this_class*>(dest);
+    n->init_controls();
+}
+
+void NodePanelFloating::init()
+{
+    parent::init();
+    init_template("tpl-panel-floating");
+    init_controls();
+}
+
+void NodePanelFloating::init_controls()
+{
+    SetPositioning(YGPositionTypeAbsolute);
+    SetPosition({ 0, 0 });
+    m_mouse_ignore = false;
+    m_flood_events = true;
+    m_capture_children = true;
+    m_container = find("container");
+    m_button_minimize = find<NodeButton>("button-minimize");
+    m_button_minimize->on_click = [this](Node*) {
+        m_container->ToggleVisibility();
+    };
+}
+
+kEventResult NodePanelFloating::handle_event(Event* e)
+{
+    parent::handle_event(e);
+    kEventResult ret = kEventResult::Available;
+    auto me = static_cast<MouseEvent*>(e);
+    switch (e->m_type)
+    {
+    case kEventType::MouseDownL:
+        m_dragging = true;
+        m_drag_start_pos = m_pos;
+        m_drag_start_cur = me->m_pos;
+        mouse_capture();
+        ret = kEventResult::Consumed;
+        break;
+    case kEventType::MouseMove:
+        if (m_dragging)
+        {
+            auto newpos = glm::clamp(m_drag_start_pos + me->m_pos - m_drag_start_cur, { 0, 0 }, root()->m_size - m_size);
+            SetPosition(newpos);
+            ret = kEventResult::Consumed;
+        }
+        break;
+    case kEventType::MouseUpL:
+        m_dragging = false;
+        mouse_release();
+        ret = kEventResult::Consumed;
+        break;
+    default:
+        break;
+    }
+    return ret;
+}