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104 lines
2.1 KiB
C++
104 lines
2.1 KiB
C++
/*
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* \brief Scout GUI parent element
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* \author Norman Feske
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* \date 2006-08-30
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*/
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/*
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* Copyright (C) 2006-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__SCOUT__PARENT_ELEMENT_H_
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#define _INCLUDE__SCOUT__PARENT_ELEMENT_H_
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#include <scout/element.h>
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namespace Scout {
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class Element;
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class Parent_element;
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}
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class Scout::Parent_element : public Element
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{
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private:
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/*
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* Noncopyable
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*/
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Parent_element(Parent_element const &);
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Parent_element &operator = (Parent_element const &);
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protected:
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Element *_first = nullptr;
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Element *_last = nullptr;
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/**
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* Format child element by a given width an horizontal offset
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*/
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int _format_children(int x, int w);
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public:
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/**
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* Constructor
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*/
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Parent_element() { _first = _last = 0; }
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/**
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* Adopt a child element
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*/
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void append(Element *e);
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/**
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* Release child element from parent element
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*/
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void remove(Element const *e);
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/**
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* Dispose references to the specified element
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*
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* The element is not necessarily an immediate child but some element
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* of the element-subtree. This function gets propagated to the root
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* parent (e.g., user state manager), which can reset the mouse focus
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* of the focused element vanishes.
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*/
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virtual void forget(Element const *e);
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/**
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* Element interface
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*/
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void draw(Canvas_base &, Point) override;
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Element *find(Point) override;
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Element *find_by_y(int) override;
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void fill_cache(Canvas_base &) override;
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void flush_cache(Canvas_base &) override;
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void geometry(Rect) override;
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/**
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* Execute function on each child
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*
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* The functor FUNC takes a reference to the element as argument.
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*/
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template <typename FUNC>
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void for_each_child(FUNC func)
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{
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for (Element *e = _first; e; e = e->next)
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func(*e);
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}
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};
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template <typename FUNC>
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void Scout::Element::for_each_sibling(FUNC func)
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{
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if (parent())
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parent()->for_each_child(func);
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}
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#endif /* _INCLUDE__SCOUT__PARENT_ELEMENT_H_ */
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