guiTable.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
 
#pragma once
 
#include <map>
#include <set>
#include <string>
#include <vector>
 
#include "guiScrollBar.h"
 
class ISimpleTextureSource;
 
/*
        A table GUI element for GUIFormSpecMenu.
 
        Sends a EGET_TABLE_CHANGED event to the parent when
        an item is selected or double-clicked.
        Call checkEvent() to get info.
 
        Credits: The interface and implementation of this class are (very)
        loosely based on the Irrlicht classes CGUITable and CGUIListBox.
        CGUITable and CGUIListBox are licensed under the Irrlicht license;
        they are Copyright (C) 2002-2012 Nikolaus Gebhardt
*/
class GUITable : public gui::IGUIElement
{
public:
        /*
                Stores dynamic data that should be preserved
                when updating a formspec
        */
        struct DynamicData
        {
                s32 selected = 0;
                s32 scrollpos = 0;
                s32 keynav_time = 0;
                core::stringw keynav_buffer;
                std::set<s32> opened_trees;
        };
 
        /*
                An option of the form <name>=<value>
        */
        struct Option
        {
                std::string name;
                std::string value;
 
                Option(const std::string &name_, const std::string &value_) :
                        name(name_),
                        value(value_)
                {}
        };
 
        /*
                A list of options that concern the entire table
        */
        typedef std::vector<Option> TableOptions;
 
        /*
                A column with options
        */
        struct TableColumn
        {
                std::string type;
                std::vector<Option> options;
        };
        typedef std::vector<TableColumn> TableColumns;
 
 
        GUITable(gui::IGUIEnvironment *env,
                        gui::IGUIElement *parent, s32 id,
                        core::rect<s32> rectangle,
                        ISimpleTextureSource *tsrc);
 
        virtual ~GUITable();
 
        /* Split a string of the form "name=value" into name and value */
        static Option splitOption(const std::string &str);
 
        /* Set textlist-like options, columns and data */
        void setTextList(const std::vector<std::string> &content,
                        bool transparent);
 
        // Adds empty strings to end of content if there is an incomplete row
        void setTable(const TableOptions &options,
                        const TableColumns &columns,
                        std::vector<std::string> &content);
 
        /* Clear the table */
        void clear();
 
        /* Get info about last event (string such as "CHG:1:2") */
        // Call this after EGET_TABLE_CHANGED
        std::string checkEvent();
 
        /* Get index of currently selected row (first=1; 0 if none selected) */
        s32 getSelected() const;
 
        /* Set currently selected row (first=1; 0 if none selected) */
        // If given index is not visible at the moment, select its parent
        // Autoscroll to make the selected row fully visible
        void setSelected(s32 index);
 
        virtual void setOverrideFont(gui::IGUIFont *font = nullptr);
 
        virtual gui::IGUIFont *getOverrideFont() const;
 
        /* Get selection, scroll position and opened (sub)trees */
        DynamicData getDynamicData() const;
 
        /* Set selection, scroll position and opened (sub)trees */
        void setDynamicData(const DynamicData &dyndata);
 
        /* Must be called when position or size changes */
        virtual void updateAbsolutePosition();
 
        /* Irrlicht draw method */
        virtual void draw();
 
        /* Irrlicht event handler */
        virtual bool OnEvent(const SEvent &event);
 
protected:
        enum ColumnType {
                COLUMN_TYPE_TEXT,
                COLUMN_TYPE_IMAGE,
                COLUMN_TYPE_COLOR,
                COLUMN_TYPE_INDENT,
                COLUMN_TYPE_TREE,
        };
 
        struct Cell {
                s32 xmin;
                s32 xmax;
                s32 xpos;
                ColumnType content_type;
                s32 content_index;
                s32 tooltip_index;
                video::SColor color;
                bool color_defined;
                s32 reported_column;
                f32 image_scale; // only for "image" type columns
        };
 
        struct Row {
                Cell *cells;
                s32 cellcount;
                s32 indent;
                // visible_index >= 0: is index of row in m_visible_rows
                // visible_index == -1: parent open but other ancestor closed
                // visible_index == -2: parent closed
                s32 visible_index;
        };
 
        // Texture source
        ISimpleTextureSource *m_tsrc;
 
        // Table content (including hidden rows)
        std::vector<Row> m_rows;
        // Table content (only visible; indices into m_rows)
        std::vector<s32> m_visible_rows;
        bool m_is_textlist = false;
        bool m_has_tree_column = false;
 
        // Selection status
        s32 m_selected = -1; // index of row (1...n), or 0 if none selected
        s32 m_sel_column = 0;
        bool m_sel_doubleclick = false;
 
        // Keyboard navigation stuff
        u64 m_keynav_time = 0;
        core::stringw m_keynav_buffer = L"";
 
        // Drawing and geometry information
        bool m_border = true;
        video::SColor m_color = video::SColor(255, 255, 255, 255);
        video::SColor m_background = video::SColor(255, 0, 0, 0);
        video::SColor m_highlight = video::SColor(255, 70, 100, 50);
        video::SColor m_highlight_text = video::SColor(255, 255, 255, 255);
        s32 m_rowheight = 1;
        gui::IGUIFont *m_font = nullptr;
        GUIScrollBar *m_scrollbar = nullptr;
 
        // Allocated strings and images
        std::vector<core::stringw> m_strings;
        std::vector<video::ITexture*> m_images;
        std::map<std::string, s32> m_alloc_strings;
        std::map<std::string, s32> m_alloc_images;
 
        s32 allocString(const std::string &text);
        s32 allocImage(const std::string &imagename);
        void allocationComplete();
 
        // Helper for draw() that draws a single cell
        void drawCell(const Cell *cell, video::SColor color,
                        const core::rect<s32> &rowrect,
                        const core::rect<s32> &client_clip);
 
        // Returns the i-th visible row (NULL if i is invalid)
        const Row *getRow(s32 i) const;
 
        // Key navigation helper
        bool doesRowStartWith(const Row *row, const core::stringw &str) const;
 
        // Returns the row at a given screen Y coordinate
        // Returns index i such that m_rows[i] is valid (or -1 on error)
        s32 getRowAt(s32 y, bool &really_hovering) const;
 
        // Returns the cell at a given screen X coordinate within m_rows[row_i]
        // Returns index j such that m_rows[row_i].cells[j] is valid
        // (or -1 on error)
        s32 getCellAt(s32 x, s32 row_i) const;
 
        // Make the selected row fully visible
        void autoScroll();
 
        // Should be called when m_rowcount or m_rowheight changes
        void updateScrollBar();
 
        // Sends EET_GUI_EVENT / EGET_TABLE_CHANGED to parent
        void sendTableEvent(s32 column, bool doubleclick);
 
        // Functions that help deal with hidden rows
        // The following functions take raw row indices (hidden rows not skipped)
        void getOpenedTrees(std::set<s32> &opened_trees) const;
        void setOpenedTrees(const std::set<s32> &opened_trees);
        void openTree(s32 to_open);
        void closeTree(s32 to_close);
        // The following function takes a visible row index (hidden rows skipped)
        // dir: -1 = left (close), 0 = auto (toggle), 1 = right (open)
        void toggleVisibleTree(s32 row_i, int dir, bool move_selection);
 
        // Aligns cell content in column according to alignment specification
        // align = 0: left aligned, 1: centered, 2: right aligned, 3: inline
        static void alignContent(Cell *cell, s32 xmax, s32 content_width,
                        s32 align);
};