var_tree.hpp
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上传日期:2020-07-06
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文件大小:6k
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midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * var_tree.hpp
- *****************************************************************************
- * Copyright (C) 2005 the VideoLAN team
- * $Id: ad269bbdfecc20e112de304b29970788214850dc $
- *
- * Authors: Antoine Cellerier <dionoea@videolan.org>
- * Clément Stenac <zorglub@videolan.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- #ifndef VAR_TREE_HPP
- #define VAR_TREE_HPP
- #include <list>
- #include "variable.hpp"
- #include "observer.hpp"
- #include "ustring.hpp"
- #include "var_percent.hpp"
- /// Description of an update to the tree
- typedef struct tree_update
- {
- int i_type;
- int i_parent;
- int i_id;
- bool b_active_item;
- bool b_visible;
- } tree_update;
- /// Tree variable
- class VarTree: public Variable, public Subject<VarTree, tree_update>
- {
- public:
- VarTree( intf_thread_t *pIntf );
- VarTree( intf_thread_t *pIntf, VarTree *pParent, int id,
- const UStringPtr &rcString, bool selected, bool playing,
- bool expanded,bool readonly, void *pData );
- virtual ~VarTree();
- /// Get the variable type
- virtual const string &getType() const { return m_type; }
- /// Add a pointer on string in the children's list
- virtual void add( int id, const UStringPtr &rcString, bool selected,
- bool playing, bool expanded, bool readonly,
- void *pData );
- /// Remove the selected item from the children's list
- virtual void delSelected();
- /// Remove all elements from the children's list
- virtual void clear();
- /// todo Use accessors for these fields ?
- int m_id;
- UStringPtr m_cString;
- bool m_selected;
- bool m_playing;
- bool m_expanded;
- bool m_deleted;
- void *m_pData;
- inline bool isReadonly() { return m_readonly; };
- /// Get the number of children
- int size() const { return m_children.size(); }
- /// Iterators
- typedef list<VarTree>::iterator Iterator;
- typedef list<VarTree>::const_iterator ConstIterator;
- /// Begining of the children's list
- Iterator begin() { return m_children.begin(); }
- ConstIterator begin() const { return m_children.begin(); }
- /// End of children's list
- Iterator end() { return m_children.end(); }
- ConstIterator end() const { return m_children.end(); }
- /// Back of children's list
- VarTree &back() { return m_children.back(); }
- /// Return an iterator on the n'th element of the children's list
- Iterator operator[]( int n );
- ConstIterator operator[]( int n ) const;
- /// Parent node
- VarTree *parent() { return m_pParent; }
- void checkParents( VarTree *pParent );
- /// Get next sibling
- Iterator getNextSibling( Iterator );
- Iterator next_uncle();
- Iterator prev_uncle();
- /// Get root node
- VarTree *root()
- {
- VarTree *parent = this;
- while( parent->parent() != NULL )
- parent = parent->parent();
- return parent;
- }
- /// Get first leaf
- Iterator firstLeaf();
- void removeChild( VarTree::Iterator item )
- {
- m_children.erase( item );
- }
- /// Execute the action associated to this item
- virtual void action( VarTree *pItem ) {}
- /// Get a reference on the position variable
- VarPercent &getPositionVar() const
- { return *((VarPercent*)m_cPosition.get()); }
- /// Get a counted pointer on the position variable
- const VariablePtr &getPositionVarPtr() const { return m_cPosition; }
- /// Count the number of items that should be displayed if the playlist window wasn't limited
- int visibleItems();
- /// Count the number of leafs in the tree
- int countLeafs();
- /// Return iterator to the n'th visible item
- Iterator getVisibleItem( int n );
- /// Return iterator to the n'th leaf
- Iterator getLeaf( int n );
- /// Given an iterator to a visible item, return the next visible item
- Iterator getNextVisibleItem( Iterator it );
- /// Given an it to a visible item, return the previous visible item
- Iterator getPrevVisibleItem( Iterator it );
- /// Given an iterator to an item, return the next item
- Iterator getNextItem( Iterator it );
- /// Given an iterator to an item, return the previous item
- Iterator getPrevItem( Iterator it );
- /// Given an iterator to an item, return the next leaf
- Iterator getNextLeaf( Iterator it );
- /// Given an iterator to an item, return the previous leaf
- Iterator getPrevLeaf( Iterator it );
- /// Find a children node with the given id
- Iterator findById( int id );
- /// Ensure an item is expanded
- void ensureExpanded( VarTree::Iterator );
- /// Get depth (root depth is 0)
- int depth()
- {
- VarTree *parent = this;
- int depth = 0;
- while( ( parent = parent->parent() ) != NULL )
- depth++;
- return depth;
- }
- private:
- /// List of children
- list<VarTree> m_children;
- /// Pointer to parent node
- VarTree *m_pParent;
- bool m_readonly;
- /// Variable type
- static const string m_type;
- /// Position variable
- VariablePtr m_cPosition;
- };
- #endif