Fix restored columns getting an almost-zero width

[amule.git] / src / MuleListCtrl.h

//
// This file is part of the aMule Project.
//
// Copyright (c) 2003-2008 aMule Team ( admin@amule.org / http://www.amule.org )
// Copyright (c) 2002 Merkur ( devs@emule-project.net / http://www.emule-project.net )
//
// Any parts of this program derived from the xMule, lMule or eMule project,
// or contributed by third-party developers are copyrighted by their
// respective authors.
//
// 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 St, Fifth Floor, Boston, MA  02110-1301, USA
//

#ifndef MULELISTCTRL_H
#define MULELISTCTRL_H

#ifdef _WIN32
#include <wx/msw/winundef.h>
#endif

#include <wx/defs.h> // Do_not_auto_remove (Mac, Win32, and just good practice)
#include "extern/wxWidgets/listctrl.h"

#include <vector>
#include <list>

/**
 * Enhanced wxListCtrl provided custom-drawing among other things.
 *
 * This class provides these features which the original wxListCtrl lacks:
 *  - Automatic sort arrows upon clicks on the column headers
 *  - Custom drawing of items.
 *  - Hiding of columns through auto-generated popup-menu.
 *  - Helper function for inserting items pre-sorted.
 *  - Loading and saving of column properties.
 *  - Selection of items by typing an initial part of the text (TTS).
 */
class CMuleListCtrl : public MuleExtern::wxGenericListCtrl
{
public:
        /**
         * The various ways in which a column can be sorted.
         *
         * If SORT_DES is not set, sorting is taken to be 
         * ascending. If SORT_ALT is not set, sorting is 
         * taken to be normal.
         */
        enum MLOrder
        {
                //! If set, sorting is to be in descending order.
                SORT_DES        = 0x1000,
                
                //! If sorting should use alternate method.
                //! Is specified in with or without DEC.
                SORT_ALT        = 0x2000
        };

        //! Mask which covers the column part of the sort-data.
        static const unsigned COLUMN_MASK = 0xfff;

        //! Mask which covers the sorting part of the sort-data.
        static const unsigned SORTING_MASK = 0x3000;

        /**
         * Constructor.
         * 
         * @see wxGenericListCtrl::wxGenericListCtrl for documentation of parameters.
         */
         CMuleListCtrl(
                       wxWindow *parent,
                       wxWindowID winid = -1,
                       const wxPoint &pos = wxDefaultPosition,
                       const wxSize &size = wxDefaultSize,
                       long style = wxLC_ICON,
                       const wxValidator& validator = wxDefaultValidator,
                       const wxString &name = wxT("mulelistctrl") );

        /**
         * Destructor.
         *
         * If a name for the table has been specified with SetTableName, then 
         * column settings will be saved automatically.
         */ 
        virtual ~CMuleListCtrl();

        /**
         * Saves column settings.
         *
         * Currently saves the width of all columns, hidden columns, the column
         * to sort by and in which direction to sort.
         */
        virtual void SaveSettings();

        /**
         * Loads column settings.
         *
         * Currently loads the width of all columns, hidden columns, the column
         * to sort by and in which direction to sort. This function also ensures
         * that the items are sorted after the settings have been read.
         */
        virtual void LoadSettings();

        /**
         * This function tries to locate the best place to insert an item.
         *
         * @param The userdata of the new item.
         * 
         * This function does a binary type search to locate the best place to
         * insert the new item with the specified userdata. It then returns the 
         * item after this position. To do this, the sorter-function must be set
         * through the SetSortFunc function, otherwise it will just return the 
         * position after the last item.
         */
        long GetInsertPos( wxUIntPtr data );

        /**
         * Sorts the list.
         *
         * Before you can use this function, you will need to specify a sorter
         * function using SetSortFunc. wxListCtrl needs such a function to
         * perform the sort.
         */
        virtual void SortList();

        //! The type of the list of item specific data
        typedef std::vector<wxUIntPtr> ItemDataList;

        /**
         * Returns a list the user-data of all selected items.
         *
         * @return A list of data associated with the selected items.
         *
         * This function will return the user-data for each selected item in a
         * vector, which can then be manipulated with regards to changes made
         * in the current order of the listctrl items.
         */
        ItemDataList GetSelectedItems() const;  

        /**
         * Sets the sorter function.
         *
         * @param func
         *
         * See the documentation on wxListCtrl::SortItems for more information
         * about the expected function type.
         */
        void SetSortFunc(MuleListCtrlCompare func)      { m_sort_func = func; }

        /**
         * Deselects all selected items, but does not change focus.
         */
        void ClearSelection();

        /**
         * Insert a new column.
         *
         * @param[in] col       Column will be inserted at this position.
         * @param[in] heading   Heading text for the column.
         * @param[in] format    Format (alignment) of the column.
         * @param[in] width     The column width.
         * @param[in] name      Internal name of the column.
         *
         * We override this method to allow a name to be specified for each
         * column. The name is used for saving/loading column settings
         * independently of their index. It is necessary to set a unique name
         * for each column, to let column settings be saved/loaded. If you
         * don't set a name for a column, settings for that column won't be
         * saved.
         *
         * Requirements about column names:
         * - they must not contain the ':' (colon) and ',' (comma) characters,
         * - they should be at least one character long.
         *
         * @note Changing the internal name of one column results in width of
         * that column being reset to default, and if sorting was done by that
         * column, sorting being forgotten. If you change the name of a column,
         * don't forget to update the list GetOldColumnOrder() returns, if
         * necessary.
         *
         * For more information refer to the wxWidgets documentation of
         * wxListCtrl::InsertColumn()
         */
        long InsertColumn(
                          long col,
                          const wxString& heading,
                          int format = wxLIST_FORMAT_LEFT,
                          int width = -1,
                          const wxString& name = wxEmptyString
                          );

        /**
         * Clears all items and all columns.
         *
         * Intercepted to clear column name list.
         *
         * For more information see the wxWidgets documentation of
         * wxListCtrl::ClearAll()
         */
        void ClearAll()
        {
                m_column_names.clear();
                MuleExtern::wxGenericListCtrl::ClearAll();
        }

        /**
         * Delete one column from the list.
         *
         * Not implemented yet, intercepted here just as a sanity check.
         */
        bool DeleteColumn(int WXUNUSED(col))    { wxFAIL; return false; }

        /**
         * Indicates if we're in the process of sorting.
         */
        bool IsSorting() const { return m_isSorting; }
        
protected:

        /**
         * Must be overwritten to enable alternate sorting.
         *
         * @param The column being sorted.
         *
         * Subclasses of CMuleListCtrl can allow alternative sorting
         * of columns. This is done by overriding this function and
         * returning true for the columns where alternative sorting
         * is desired. 
         */
        virtual bool AltSortAllowed(unsigned column) const;

        /**
         * Returns the string used when selecting rows via Type-To-Select.
         *
         * @param item The index of the item being examined.
         *
         * By default, this function simply returns the text in the first
         * column for the given item. However, when owner-drawing is
         * enabled, this function _must_ be overriden.
         */
        virtual wxString GetTTSText(unsigned item) const;

        /**
         * Sets the internally used table-name.
         *
         * @param name The new name or an empty string to disable.
         *
         * You need to call this function with a unique name before you can 
         * make use of the LoadSettings/SaveSettings functions. CMuleListCtrl
         * uses the name specified in this command to create unique keynames.
         */
        void SetTableName(const wxString& name)         { m_name = name; }

        /**
         * Return old column order.
         *
         * @return The pre-2.2.2 column order.
         *
         * This function should be overridden in descendant classes to return a
         * comma-separated list of the old column order, when column data was
         * saved/loaded by index. The default implementation returns an empty
         * string, meaning that old settings (if any) should be discarded.
         *
         * @note When you add or remove columns from the list control, DO NOT
         * change this list. This list may only be updated if you changed a
         * column name that is already in this list, to reflect the name
         * change. List order also must be preserved.
         */
        virtual wxString GetOldColumnOrder() const;

        /**
         * Returns the column which is currently used to sort the list.
         */
        unsigned GetSortColumn() const  { return m_sort_orders.front().first; }

        /**
         * Returns the current sorting order, a combination of the DES and ALT flags.
         */
        unsigned GetSortOrder() const   { return m_sort_orders.front().second; }

        /**
         * Set the sort column
         *
         * @param column The column with which the list should be sorted.
         * @param order The order in which to sort the column.
         *
         * Note that attempting to sort a column in an unsupported order
         * is an illegal operation.
         */
        void SetSorting(unsigned column, unsigned order);

        /**
         * Returns true if the item is sorted compared to its neighbours.
         */
        bool IsItemSorted(long item);

        /**
         * Check and fix selection state.
         * 
         * @param event The event which triggered the selection.
         * @return The index of the item selected or -1 if none.
         *
         * This function checks if the clicked item is selected.
         * If not, then the item is selected and all other items
         * are deselected.
         */
        //@{
        long CheckSelection(wxListEvent& event);
        long CheckSelection(wxMouseEvent& event);
        //@}

        /**
         * Event handler for right-clicks on the column headers.
         */
        void OnColumnRClick(wxListEvent& evt);

        /**
         * Event handler for left-clicks on the column headers.
         */
        void OnColumnLClick(wxListEvent& evt);

        /**
         * Event handler for the hide/show menu items.
         */
        void OnMenuSelected(wxCommandEvent& evt);

        /**
         * Event handler for the mouse wheel.
         */
        void OnMouseWheel(wxMouseEvent &event);

        /**
         * Event handler for key-presses, needed by TTS.
         */
        void OnChar(wxKeyEvent& evt);

        /**
         * Event handler for item selection/deletion, needed by TTS.
         */
        void OnItemSelected(wxListEvent& evt);
        void OnItemDeleted(wxListEvent& evt);
        void OnAllItemsDeleted(wxListEvent& evt);

private:
        /**
         * Resets the current TTS session.
         */
        void ResetTTS();

        /**
         * Sets the image of a specific column.
         *
         * @param col The column to change.
         * @param order The sorting order to represent. Zero unsets the image.
         */
        void SetColumnImage(unsigned col, int image);

        //! The name of the table. Used to load/save settings.
        wxString                m_name;

        //! The sorter function needed by wxListCtrl.
        MuleListCtrlCompare     m_sort_func;

        //! Contains the current search string.
        wxString                m_tts_text;

        //! Timestamp for the last TTS event.
        unsigned                m_tts_time;

        //! The index of the last item selected via TTS.
        int                     m_tts_item;

        /**
         * Wrapper around the user-provided sorter function.
         * 
         * This function ensures that items are sorted in the order
         * specified by clicking on column-headers, and also enforces
         * that different entries are never considered equal. This is
         * required for lists that make use of child-items, since
         * otherwise, parents may not end up properly located in
         * relation to child-items.
         */     
        static int wxCALLBACK SortProc(wxUIntPtr item1, wxUIntPtr item2, long sortData);

        /** Compares two items in the list, using the current sort sequence. */
        int CompareItems(wxUIntPtr item1, wxUIntPtr item2);

        //! This pair contains a column number and its sorting order.
        typedef std::pair<unsigned, unsigned> CColPair;
        typedef std::list<CColPair> CSortingList;

        class MuleSortData {
        public:
                MuleSortData(CSortingList sort_orders, MuleListCtrlCompare sort_func) : m_sort_orders(sort_orders), m_sort_func(sort_func) { };
                
                CSortingList m_sort_orders;
                MuleListCtrlCompare m_sort_func;
        };      
        
        //! This list contains in order the columns sequence to sort by.
        CSortingList m_sort_orders;

        /**
         * Get the column name by index.
         *
         * @param[in] column Index of the column whose name we're looking for.
         *
         * @return The column name or an empty string if index is invalid
         * (out of range), or the column name hasn't been set.
         */
        const wxString& GetColumnName(int column) const;

        /**
         * Get the column default width by index.
         *
         * @param[in] column Index of the column whose name we're looking for.
         *
         * @return The column default width or wx default width if index is invalid
         * (out of range), or the column name hasn't been set.
         */
        int GetColumnDefaultWidth(int column) const;

        /**
         * Get column index by name.
         *
         * @param[in] name Internal name of the colunm whose index is needed.
         *
         * @return The column index, or -1 in case the name was invalid.
         */
        int GetColumnIndex(const wxString& name) const;

        /**
         * Find out the new index of the column by the old index.
         *
         * @param[in] oldindex Old column index which we want to turn into a
         * new index.
         *
         * @return The new index of the column, or -1 if an error occured.
         */
        int GetNewColumnIndex(int oldindex) const;

        /**
         * Parses old config entries.
         *
         * @param[in] sortOrders        Old sort orders line.
         * @param[in] columnWidths      Old column widths line.
         */
        void ParseOldConfigEntries(const wxString& sortOrders, const wxString& columnWidths);

        /// This class contains a column index, its default width and its name.
        class ColNameEntry {
        public:
                int index;
                int     defaultWidth;
                wxString name;
                ColNameEntry(int _index, int _defaultWidth, const wxString& _name) 
                        :       index(_index), defaultWidth(_defaultWidth), name(_name) {}
        };

        /// This list contains the colunms' names.
        typedef std::list<ColNameEntry>         ColNameList;

        /// Container for column names, sorted by column index.
        ColNameList     m_column_names;

        // True while sorting.
        bool m_isSorting;
        
        DECLARE_EVENT_TABLE()
};

#endif // MULELISTCTRL_H
// File_checked_for_headers