ListView.hpp

 
//
// TGUI - Texus' Graphical User Interface
// Copyright (C) 2012-2022 Bruno Van de Velde (vdv_b@tgui.eu)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
//    you must not claim that you wrote the original software.
//    If you use this software in a product, an acknowledgment
//    in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
//    and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
 
 
#ifndef TGUI_LIST_VIEW_HPP
#define TGUI_LIST_VIEW_HPP
 
 
#include <TGUI/CopiedSharedPtr.hpp>
#include <TGUI/Widgets/Scrollbar.hpp>
#include <TGUI/Renderers/ListViewRenderer.hpp>
#include <TGUI/Text.hpp>
#include <set>
 
 
namespace tgui
{
    class TGUI_API ListView : public Widget
    {
      public:
 
        typedef std::shared_ptr<ListView> Ptr; 
        typedef std::shared_ptr<const ListView> ConstPtr; 
 
        enum class ColumnAlignment
        {
            Left,   
            Center, 
            Right   
        };
 
        struct Item
        {
            std::vector<Text> texts;
            Any data;
            Sprite icon;
        };
 
        struct Column
        {
            float width = 0;
            float designWidth = 0;
            float maxItemWidth = 0;
            Text text;
            ColumnAlignment alignment = ColumnAlignment::Left;
        };
 
 
        ListView(const char* typeName = "ListView", bool initRenderer = true);
 
 
        static ListView::Ptr create();
 
 
        static ListView::Ptr copy(ListView::ConstPtr listView);
 
 
        ListViewRenderer* getSharedRenderer();
        const ListViewRenderer* getSharedRenderer() const;
 
        ListViewRenderer* getRenderer();
        const ListViewRenderer* getRenderer() const;
 
 
        void setSize(const Layout2d& size) override;
        using Widget::setSize;
 
 
        std::size_t addColumn(const String& text, float width = 0, ColumnAlignment alignment = ColumnAlignment::Left);
 
 
        void setColumnText(std::size_t index, const String& text);
 
 
        String getColumnText(std::size_t index) const;
 
 
        void setColumnWidth(std::size_t index, float width);
 
 
        float getColumnWidth(std::size_t index) const;
 
 
        void setColumnAlignment(std::size_t columnIndex, ColumnAlignment alignment);
 
 
        ColumnAlignment getColumnAlignment(std::size_t columnIndex) const;
 
 
        void removeAllColumns();
 
 
        std::size_t getColumnCount() const;
 
 
        void setHeaderHeight(float height);
 
 
        float getHeaderHeight() const;
 
 
        float getCurrentHeaderHeight() const;
 
 
        void setHeaderVisible(bool showHeader);
 
 
        bool getHeaderVisible() const;
 
 
        std::size_t addItem(const String& text);
 
 
        std::size_t addItem(const std::vector<String>& item);
 
 
        void addMultipleItems(const std::vector<std::vector<String>>& items);
 
        void insertItem(std::size_t index, const String& text);
 
        void insertItem(std::size_t index, const std::vector<String>& item);
 
        void insertMultipleItems(std::size_t index, const std::vector<std::vector<String>>& items);
 
        bool changeItem(std::size_t index, const std::vector<String>& item);
 
 
        bool changeSubItem(std::size_t index, std::size_t column, const String& item);
 
 
        bool removeItem(std::size_t index);
 
 
        void removeAllItems();
 
 
        void setSelectedItem(std::size_t index);
 
 
        void setSelectedItems(const std::set<std::size_t>& indices);
 
 
        void deselectItems();
 
 
        int getSelectedItemIndex() const;
 
 
        std::set<std::size_t> getSelectedItemIndices() const;
 
 
        void setMultiSelect(bool multiSelect);
 
 
        bool getMultiSelect() const;
 
 
        void setItemData(std::size_t index, Any data);
 
 
        template <typename T>
        T getItemData(std::size_t index) const
        {
            if (index < m_items.size())
                return AnyCast<T>(m_items[index].data);
            else
                throw std::bad_cast();
        }
 
 
        void setItemIcon(std::size_t index, const Texture& texture);
 
 
        Texture getItemIcon(std::size_t index) const;
 
 
        std::size_t getItemCount() const;
 
 
        String getItem(std::size_t index) const;
 
 
        std::vector<String> getItemRow(std::size_t index) const;
 
 
        String getItemCell(std::size_t rowIndex, std::size_t columnIndex) const;
 
 
        std::vector<String> getItems() const;
 
 
        std::vector<std::vector<String>> getItemRows() const;
 
 
        void sort(std::size_t index, const std::function<bool(const String&, const String&)>& cmp);
 
 
        void setItemHeight(unsigned int itemHeight);
 
 
        unsigned int getItemHeight() const;
 
 
        void setTextSize(unsigned int textSize) override;
 
 
        void setHeaderTextSize(unsigned int textSize);
 
 
        unsigned int getHeaderTextSize() const;
 
 
        void setSeparatorWidth(unsigned int width);
 
 
        unsigned int getSeparatorWidth() const;
 
 
        void setHeaderSeparatorHeight(unsigned int height);
 
 
        unsigned int getHeaderSeparatorHeight() const;
 
 
        void setGridLinesWidth(unsigned int width);
 
 
        unsigned int getGridLinesWidth() const;
 
 
        void setAutoScroll(bool autoScroll);
 
 
        bool getAutoScroll() const;
 
 
        void setShowVerticalGridLines(bool showGridLines);
 
 
        bool getShowVerticalGridLines() const;
 
 
        void setShowHorizontalGridLines(bool showGridLines);
 
 
        bool getShowHorizontalGridLines() const;
 
 
        void setExpandLastColumn(bool expand);
 
 
        bool getExpandLastColumn() const;
 
 
        void setVerticalScrollbarPolicy(Scrollbar::Policy policy);
 
 
        Scrollbar::Policy getVerticalScrollbarPolicy() const;
 
 
        void setHorizontalScrollbarPolicy(Scrollbar::Policy policy);
 
 
        Scrollbar::Policy getHorizontalScrollbarPolicy() const;
 
 
        void setVerticalScrollbarValue(unsigned int value);
 
 
        unsigned int getVerticalScrollbarValue() const;
 
 
        void setHorizontalScrollbarValue(unsigned int value);
 
 
        unsigned int getHorizontalScrollbarValue() const;
 
 
        void setFixedIconSize(Vector2f iconSize);
 
 
        Vector2f getFixedIconSize() const;
 
 
        bool isMouseOnWidget(Vector2f pos) const override;
 
        void leftMousePressed(Vector2f pos) override;
 
        void leftMouseReleased(Vector2f pos) override;
 
        void rightMousePressed(Vector2f pos) override;
 
        void mouseMoved(Vector2f pos) override;
 
        bool mouseWheelScrolled(float delta, Vector2f pos) override;
 
        void mouseNoLongerOnWidget() override;
 
        void leftMouseButtonNoLongerDown() override;
 
        void keyPressed(const Event::KeyEvent& event) override;
 
 
        void draw(BackendRenderTargetBase& target, RenderStates states) const override;
 
 
    protected:
 
        Signal& getSignal(String signalName) override;
 
 
        void rendererChanged(const String& property) override;
 
 
        std::unique_ptr<DataIO::Node> save(SavingRenderersMap& renderers) const override;
 
 
        void load(const std::unique_ptr<DataIO::Node>& node, const LoadingRenderersMap& renderers) override;
 
 
        // Returns the size without the borders
        Vector2f getInnerSize() const;
 
 
        // Create a Text object for an item from the given caption, using the preset color, font, text size and opacity
        Text createText(const String& caption);
 
 
        // Create a Text object for a header text from the given caption, using the preset color, font, text size and opacity
        Text createHeaderText(const String& caption);
 
 
        // Changes the color of all Text objects in an item
        virtual void setItemColor(std::size_t index, const Color& color);
 
 
        // Calculate the width of the column based on its caption when no column width was provided
        float calculateAutoColumnWidth(const Text& text);
 
 
        // Update the colors of the selected and hovered items
        void updateSelectedAndhoveredItemColors();
 
 
        // Update the color of all the items
        void updateItemColors();
 
 
        // Changes the color of all header texts
        void updateHeaderTextsColor();
 
 
        // Update on which item the mouse is standing
        void updateHoveredItem(int item);
 
 
        // Update which item is selected
        void updateSelectedItem(int item);
 
 
        // Selects multiple items when multi-select is on and the user selects an item while the shift key is held down
        void selectRangeFromEvent(std::size_t item);
 
 
        // Update the maximum item width of the last column by recalculating all items' widths.
        // Returns whether the max item width was changed.
        bool updateLastColumnMaxItemWidth();
 
 
        // Update the maximum item width of the last column based on the addition of an Item.
        // Returns true if the maximum item width was changed.
        bool updateLastColumnMaxItemWidthWithNewItem(const Item& item);
 
 
        // Update the maximum item width of the last column based on the modification of an Item.
        // Returns true if the maximum item width was changed.
        bool updateLastColumnMaxItemWidthWithModifiedItem(const Item& modifiedItem, float oldDesiredWidthInLastColumn);
 
 
        // Add item to selected set
        void addSelectedItem(int item);
 
 
        // Remove item from selected set
        void removeSelectedItem(std::size_t item);
 
 
        // Update on which item the mouse is standing, given the current mouse position
        void updateHoveredItemByMousePos(Vector2f mousePos);
 
 
        // Returns either the configured separator width or the width of vertical grid lines, whichever is larger.
        unsigned int getTotalSeparatorWidth() const;
 
 
        // Returns the total width an Item takes up at some column, assuming it will not be cut off by the column.
        float getItemTotalWidth(const Item& item, std::size_t columnIndex) const;
 
 
        // Found out which column is located below the mouse. The mouseLeft is relative to the widget position.
        // This function should only be called after checking that the mouse is positioned on top of the header.
        int getColumnIndexBelowMouse(float mouseLeft);
 
 
        // Recalculate the size and viewport size of the scrollbars
        void updateScrollbars();
 
        // Recalculate the maximum value for the vertical scrollbar
        void updateVerticalScrollbarMaximum();
 
        // Recalculate the maximum value for the horizontal scrollbar
        void updateHorizontalScrollbarMaximum();
 
 
        // Draw the header text for a single column
        void drawHeaderText(BackendRenderTargetBase& target, RenderStates states, float columnWidth, float headerHeight, std::size_t column) const;
 
 
        // Draw the texts in a single column
        void drawColumn(BackendRenderTargetBase& target, RenderStates states, std::size_t firstItem, std::size_t lastItem, std::size_t column, float columnWidth) const;
 
 
        // This function is called every frame with the time passed since the last frame.
        bool updateTime(Duration elapsedTime) override;
 
 
        // Makes a copy of the widget
        Widget::Ptr clone() const override
        {
            return std::make_shared<ListView>(*this);
        }
 
 
    public:
 
        SignalInt onItemSelect  = {"ItemSelected"};
 
        SignalInt onDoubleClick = {"DoubleClicked"};  
        SignalInt onRightClick  = {"RightClicked"};   
        SignalInt onHeaderClick = {"HeaderClicked"};  
 
 
    protected:
 
        std::vector<Column> m_columns;
        std::vector<Item>   m_items;
        std::set<std::size_t> m_selectedItems;
 
        int m_hoveredItem = -1;
        int m_firstSelectedItemIndex = -1;
        int m_focusedItemIndex = -1;
 
        float m_requestedHeaderHeight = 0;
        unsigned int m_itemHeight = 0;
        unsigned int m_requestedTextSize = 0;
        unsigned int m_headerTextSize = 0;
        unsigned int m_headerSeparatorHeight = 0;
        unsigned int m_separatorWidth = 1;
        unsigned int m_gridLinesWidth = 1;
        unsigned int m_iconCount = 0;
        float m_maxIconWidth = 0;
        float m_maxItemWidth = 0; // If there are no columns, this is the maximum width from all items
        bool m_headerVisible = true;
        bool m_showHorizontalGridLines = false;
        bool m_showVerticalGridLines = true;
        bool m_expandLastColumn = false;
        bool m_multiSelect = false;
        Vector2f m_fixedIconSize;
 
        CopiedSharedPtr<ScrollbarChildWidget> m_horizontalScrollbar;
        CopiedSharedPtr<ScrollbarChildWidget> m_verticalScrollbar;
        Scrollbar::Policy m_verticalScrollbarPolicy = Scrollbar::Policy::Automatic;
        Scrollbar::Policy m_horizontalScrollbarPolicy = Scrollbar::Policy::Automatic;
 
        int m_mouseOnHeaderIndex = -1; // If the left mouse is down, this contains the index of the column if the mouse went down on the header
        int m_possibleDoubleClick = false; // Will be set to true after the first click, but gets reset to false when the second click does not occur soon after
        bool m_autoScroll = true; // Should the list view scroll to the bottom when a new item is added?
 
        // Cached renderer properties
        Borders   m_bordersCached;
        Borders   m_paddingCached;
        Color     m_borderColorCached;
        Color     m_separatorColorCached;
        Color     m_gridLinesColorCached;
        Color     m_headerTextColorCached;
        Color     m_headerBackgroundColorCached;
        Color     m_backgroundColorCached;
        Color     m_backgroundColorHoverCached;
        Color     m_selectedBackgroundColorCached;
        Color     m_selectedBackgroundColorHoverCached;
        Color     m_textColorCached;
        Color     m_textColorHoverCached;
        Color     m_selectedTextColorCached;
        Color     m_selectedTextColorHoverCached;
 
    };
 
}
 
 
#endif // TGUI_LIST_VIEW_HPP