/** 
 * @file llfolderview.h
 * @brief Definition of the folder view collection of classes.
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

/**
 *
 * The folder view collection of classes provides an interface for
 * making a 'folder view' similar to the way the a single pane file
 * folder interface works.
 *
 */

#ifndef LL_LLFOLDERVIEW_H
#define LL_LLFOLDERVIEW_H

#include "llfolderviewitem.h"	// because LLFolderView is-a LLFolderViewFolder

#include "lluictrl.h"
#include "v4color.h"
#include "lldepthstack.h"
#include "lleditmenuhandler.h"
#include "llfontgl.h"
#include "llscrollcontainer.h"

class LLFolderViewModelInterface;
class LLFolderViewFolder;
class LLFolderViewItem;
class LLFolderViewFilter;
class LLPanel;
class LLLineEditor;
class LLMenuGL;
class LLUICtrl;
class LLTextBox;

/**
 * Class LLFolderViewScrollContainer
 *
 * A scroll container which provides the information about the height
 * of currently displayed folder view contents.
 * Used for updating vertical scroll bar visibility in inventory panel.
 * See LLScrollContainer::calcVisibleSize().
 */
class LLFolderViewScrollContainer : public LLScrollContainer
{
public:
	/*virtual*/ ~LLFolderViewScrollContainer() {};
	/*virtual*/ const LLRect getScrolledViewRect() const;

protected:
	LLFolderViewScrollContainer(const LLScrollContainer::Params& p);
	friend class LLUICtrlFactory;
};

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLFolderView
//
// The LLFolderView represents the root level folder view object. 
// It manages the screen region of the folder view.
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

class LLFolderView : public LLFolderViewFolder, public LLEditMenuHandler
{
public:
	struct Params : public LLInitParam::Block<Params, LLFolderViewFolder::Params>
	{
		Mandatory<LLPanel*>	    parent_panel;
		Optional<std::string>   title;
		Optional<bool>			use_label_suffix,
								allow_multiselect,
								show_empty_message,
								use_ellipses,
								show_item_link_overlays;
		Mandatory<LLFolderViewModelInterface*>	view_model;
        Mandatory<std::string>   options_menu;


		Params();
	};

	friend class LLFolderViewScrollContainer;
    typedef std::deque<LLFolderViewItem*> selected_items_t;

	LLFolderView(const Params&);
	virtual ~LLFolderView( void );

	virtual BOOL canFocusChildren() const;

	virtual const LLFolderView*	getRoot() const { return this; }
	virtual LLFolderView*	getRoot() { return this; }

	LLFolderViewModelInterface* getFolderViewModel() { return mViewModel; }
	const LLFolderViewModelInterface* getFolderViewModel() const { return mViewModel; }

	typedef boost::signals2::signal<void (const std::deque<LLFolderViewItem*>& items, BOOL user_action)> signal_t;
	void setSelectCallback(const signal_t::slot_type& cb) { mSelectSignal.connect(cb); }
	void setReshapeCallback(const signal_t::slot_type& cb) { mReshapeSignal.connect(cb); }
	
	bool getAllowMultiSelect() { return mAllowMultiSelect; }

	// Close all folders in the view
	void closeAllFolders();
	void openTopLevelFolders();

	virtual void addFolder( LLFolderViewFolder* folder);

	// Find width and height of this object and its children. Also
	// makes sure that this view and its children are the right size.
	virtual S32 arrange( S32* width, S32* height );
	virtual S32 getItemHeight();

	void arrangeAll() { mArrangeGeneration++; }
	S32 getArrangeGeneration() { return mArrangeGeneration; }

	// applies filters to control visibility of items
	virtual void filter( LLFolderViewFilter& filter);

	// Get the last selected item
	virtual LLFolderViewItem* getCurSelectedItem( void );
    selected_items_t& getSelectedItems( void );

	// Record the selected item and pass it down the hierarchy.
	virtual BOOL setSelection(LLFolderViewItem* selection, BOOL openitem,
		BOOL take_keyboard_focus = TRUE);

	// This method is used to toggle the selection of an item. Walks
	// children, and keeps track of selected objects.
	virtual BOOL changeSelection(LLFolderViewItem* selection, BOOL selected);

	virtual std::set<LLFolderViewItem*> getSelectionList() const;

	// Make sure if ancestor is selected, descendants are not
	void sanitizeSelection();
	virtual void clearSelection();
	void addToSelectionList(LLFolderViewItem* item);
	void removeFromSelectionList(LLFolderViewItem* item);

	bool startDrag();
	void setDragAndDropThisFrame() { mDragAndDropThisFrame = TRUE; }
	void setDraggingOverItem(LLFolderViewItem* item) { mDraggingOverItem = item; }
	LLFolderViewItem* getDraggingOverItem() { return mDraggingOverItem; }

	// Deletion functionality
 	void removeSelectedItems();

	void autoOpenItem(LLFolderViewFolder* item);
	void closeAutoOpenedFolders();
	BOOL autoOpenTest(LLFolderViewFolder* item);
	BOOL isOpen() const { return TRUE; } // root folder always open

	// Copy & paste
	virtual BOOL	canCopy() const;
	virtual void	copy();

	virtual BOOL	canCut() const;
	virtual void	cut();

	virtual BOOL	canPaste() const;
	virtual void	paste();

	LLFolderViewItem* getNextUnselectedItem();

	// Public rename functionality - can only start the process
	void startRenamingSelectedItem( void );

	// LLView functionality
	///*virtual*/ BOOL handleKey( KEY key, MASK mask, BOOL called_from_parent );
	/*virtual*/ BOOL handleKeyHere( KEY key, MASK mask );
	/*virtual*/ BOOL handleUnicodeCharHere(llwchar uni_char);
	/*virtual*/ BOOL handleMouseDown( S32 x, S32 y, MASK mask );
	/*virtual*/ BOOL handleDoubleClick( S32 x, S32 y, MASK mask );
	/*virtual*/ BOOL handleRightMouseDown( S32 x, S32 y, MASK mask );
	/*virtual*/ BOOL handleHover( S32 x, S32 y, MASK mask );
	/*virtual*/ BOOL handleDragAndDrop(S32 x, S32 y, MASK mask, BOOL drop,
								   EDragAndDropType cargo_type,
								   void* cargo_data,
								   EAcceptance* accept,
								   std::string& tooltip_msg);
	/*virtual*/ void reshape(S32 width, S32 height, BOOL called_from_parent = TRUE);
	/*virtual*/ void onMouseLeave(S32 x, S32 y, MASK mask) { setShowSelectionContext(FALSE); }
	virtual void draw();
	virtual void deleteAllChildren();

	void scrollToShowSelection();
	void scrollToShowItem(LLFolderViewItem* item, const LLRect& constraint_rect);
	void setScrollContainer( LLScrollContainer* parent ) { mScrollContainer = parent; }
	LLRect getVisibleRect();

	BOOL search(LLFolderViewItem* first_item, const std::string &search_string, BOOL backward);
	void setShowSelectionContext(bool show) { mShowSelectionContext = show; }
	BOOL getShowSelectionContext();
	void setShowSingleSelection(bool show);
	BOOL getShowSingleSelection() { return mShowSingleSelection; }
	F32  getSelectionFadeElapsedTime() { return mMultiSelectionFadeTimer.getElapsedTimeF32(); }
	bool getUseEllipses() { return mUseEllipses; }
	S32 getSelectedCount() { return (S32)mSelectedItems.size(); }

	void	update();						// needs to be called periodically (e.g. once per frame)

	BOOL needsAutoSelect() { return mNeedsAutoSelect && !mAutoSelectOverride; }
	BOOL needsAutoRename() { return mNeedsAutoRename; }
	void setNeedsAutoRename(BOOL val) { mNeedsAutoRename = val; }
	void setPinningSelectedItem(BOOL val) { mPinningSelectedItem = val; }
	void setAutoSelectOverride(BOOL val) { mAutoSelectOverride = val; }

	bool showItemLinkOverlays() { return mShowItemLinkOverlays; }

	void setCallbackRegistrar(LLUICtrl::CommitCallbackRegistry::ScopedRegistrar* registrar) { mCallbackRegistrar = registrar; }

	LLPanel* getParentPanel() { return mParentPanel.get(); }
	// DEBUG only
	void dumpSelectionInformation();

	virtual S32	notify(const LLSD& info) ;
	
	bool useLabelSuffix() { return mUseLabelSuffix; }
	void updateMenu();

    // Note: We may eventually have to move that method up the hierarchy to LLFolderViewItem.
	LLHandle<LLFolderView>	getHandle() const { return getDerivedHandle<LLFolderView>(); }
    
private:
	void updateMenuOptions(LLMenuGL* menu);
	void updateRenamerPosition();

protected:
	LLScrollContainer* mScrollContainer;  // NULL if this is not a child of a scroll container.

	void commitRename( const LLSD& data );
	void onRenamerLost();

	void finishRenamingItem( void );
	void closeRenamer( void );

	bool selectFirstItem();
	bool selectLastItem();
	
	BOOL addNoOptions(LLMenuGL* menu) const;


protected:
	LLHandle<LLView>					mPopupMenuHandle;
	
	selected_items_t				mSelectedItems;
	bool							mKeyboardSelection,
									mAllowMultiSelect,
									mShowEmptyMessage,
									mShowFolderHierarchy,
									mNeedsScroll,
									mPinningSelectedItem,
									mNeedsAutoSelect,
									mAutoSelectOverride,
									mNeedsAutoRename,
									mUseLabelSuffix,
									mDragAndDropThisFrame,
									mShowItemLinkOverlays,
									mShowSelectionContext,
									mShowSingleSelection;

	// Renaming variables and methods
	LLFolderViewItem*				mRenameItem;  // The item currently being renamed
	LLLineEditor*					mRenamer;

	LLRect							mScrollConstraintRect;
	
	LLDepthStack<LLFolderViewFolder>	mAutoOpenItems;
	LLFolderViewFolder*				mAutoOpenCandidate;
	LLFrameTimer					mAutoOpenTimer;
	LLFrameTimer					mSearchTimer;
	std::string						mSearchString;
	LLFrameTimer					mMultiSelectionFadeTimer;
	S32								mArrangeGeneration;

	signal_t						mSelectSignal;
	signal_t						mReshapeSignal;
	S32								mSignalSelectCallback;
	S32								mMinWidth;
	
	LLHandle<LLPanel>               mParentPanel;
	
	LLFolderViewModelInterface*		mViewModel;

	/**
	 * Is used to determine if we need to cut text In LLFolderViewItem to avoid horizontal scroll.
	 * NOTE: For now it's used only to cut LLFolderViewItem::mLabel text for Landmarks in Places Panel.
	 */
	bool							mUseEllipses; // See EXT-719

	/**
	 * Contains item under mouse pointer while dragging
	 */
	LLFolderViewItem*				mDraggingOverItem; // See EXT-719

	LLUICtrl::CommitCallbackRegistry::ScopedRegistrar* mCallbackRegistrar;
	
public:
	static F32 sAutoOpenTime;
	LLTextBox*						mStatusTextBox;

};


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLFolderViewFunctor
//
// Simple abstract base class for applying a functor to folders and
// items in a folder view hierarchy. This is suboptimal for algorithms
// that only work folders or only work on items, but I'll worry about
// that later when it's determined to be too slow.
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class LLFolderViewFunctor
{
public:
	virtual ~LLFolderViewFunctor() {}
	virtual void doFolder(LLFolderViewFolder* folder) = 0;
	virtual void doItem(LLFolderViewItem* item) = 0;
};

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLSelectFirstFilteredItem
//
// This will select the first *item* found in the hierarchy. If no item can be
// selected, the first matching folder will.
// Since doFolder() is done first but we prioritize item selection, we let the 
// first filtered folder set the selection and raise a folder flag.
// The selection might be overridden by the first filtered item in doItem()  
// which checks an item flag. Since doFolder() checks the item flag too, the first
// item will still be selected if items were to be done first and folders second.
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class LLSelectFirstFilteredItem : public LLFolderViewFunctor
{
public:
	LLSelectFirstFilteredItem() : mItemSelected(FALSE), mFolderSelected(FALSE) {}
	virtual ~LLSelectFirstFilteredItem() {}
	virtual void doFolder(LLFolderViewFolder* folder);
	virtual void doItem(LLFolderViewItem* item);
	BOOL wasItemSelected() { return mItemSelected || mFolderSelected; }
protected:
	BOOL mItemSelected;
	BOOL mFolderSelected;
};

class LLOpenFilteredFolders : public LLFolderViewFunctor
{
public:
	LLOpenFilteredFolders()  {}
	virtual ~LLOpenFilteredFolders() {}
	virtual void doFolder(LLFolderViewFolder* folder);
	virtual void doItem(LLFolderViewItem* item);
};

class LLSaveFolderState : public LLFolderViewFunctor
{
public:
	LLSaveFolderState() : mApply(FALSE) {}
	virtual ~LLSaveFolderState() {}
	virtual void doFolder(LLFolderViewFolder* folder);
	virtual void doItem(LLFolderViewItem* item) {}
	void setApply(BOOL apply);
	void clearOpenFolders() { mOpenFolders.clear(); }
protected:
	std::set<LLUUID> mOpenFolders;
	BOOL mApply;
};

class LLOpenFoldersWithSelection : public LLFolderViewFunctor
{
public:
	LLOpenFoldersWithSelection() {}
	virtual ~LLOpenFoldersWithSelection() {}
	virtual void doFolder(LLFolderViewFolder* folder);
	virtual void doItem(LLFolderViewItem* item);
};

// Flags for buildContextMenu()
const U32 SUPPRESS_OPEN_ITEM = 0x1;
const U32 FIRST_SELECTED_ITEM = 0x2;
const U32 ITEM_IN_MULTI_SELECTION = 0x4;

#endif // LL_LLFOLDERVIEW_H