ListView.hpp

 
//
// TGUI - Texus' Graphical User Interface
// Copyright (C) 2012-2023 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>
 
#if !TGUI_EXPERIMENTAL_USE_STD_MODULE
 #include <set>
 #include <limits>
#endif
 
 
TGUI_MODULE_EXPORT namespace tgui
{
 class TGUI_API ListView : public Widget
 {
 public:
 
 using Ptr = std::shared_ptr<ListView>; 
 using ConstPtr = std::shared_ptr<const ListView>; 
 
 static constexpr const char StaticWidgetType[] = "ListView"; 
 
 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 widestItemWidth = 0;
 std::size_t widestItemIndex = std::numeric_limits<std::size_t>::max();
 Text text;
 ColumnAlignment alignment = ColumnAlignment::Left;
 bool autoResize = false;
 bool expanded = false;
 };
 
 ListView(const char* typeName = StaticWidgetType, bool initRenderer = true);
 
 TGUI_NODISCARD static ListView::Ptr create();
 
 TGUI_NODISCARD static ListView::Ptr copy(const ListView::ConstPtr& listView);
 
 TGUI_NODISCARD ListViewRenderer* getSharedRenderer() override;
 TGUI_NODISCARD const ListViewRenderer* getSharedRenderer() const override;
 
 TGUI_NODISCARD ListViewRenderer* getRenderer() override;
 
 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);
 
 TGUI_NODISCARD String getColumnText(std::size_t index) const;
 
 void setColumnWidth(std::size_t index, float width);
 
 TGUI_NODISCARD float getColumnWidth(std::size_t index) const;
 
 TGUI_NODISCARD float getColumnDesignWidth(std::size_t index) const;
 
 void setColumnAlignment(std::size_t columnIndex, ColumnAlignment alignment);
 
 TGUI_NODISCARD ColumnAlignment getColumnAlignment(std::size_t columnIndex) const;
 
 void setColumnAutoResize(std::size_t index, bool autoResize);
 
 TGUI_NODISCARD bool getColumnAutoResize(std::size_t index) const;
 
 void setColumnExpanded(std::size_t index, bool expand);
 
 TGUI_NODISCARD bool getColumnExpanded(std::size_t index) const;
 
 void removeAllColumns();
 
 TGUI_NODISCARD std::size_t getColumnCount() const;
 
 void setHeaderHeight(float height);
 
 TGUI_NODISCARD float getHeaderHeight() const;
 
 TGUI_NODISCARD float getCurrentHeaderHeight() const;
 
 void setHeaderVisible(bool showHeader);
 
 TGUI_NODISCARD 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;
 
 TGUI_NODISCARD std::set<std::size_t> getSelectedItemIndices() const;
 
 void setMultiSelect(bool multiSelect);
 
 TGUI_NODISCARD bool getMultiSelect() const;
 
 void setItemData(std::size_t index, Any data);
 
 template <typename DataType>
 TGUI_NODISCARD DataType getItemData(std::size_t index) const
 {
 if (index < m_items.size())
 return AnyCast<DataType>(m_items[index].data);
 else
 throw std::bad_cast();
 }
 
 void setItemIcon(std::size_t index, const Texture& texture);
 
 TGUI_NODISCARD Texture getItemIcon(std::size_t index) const;
 
 TGUI_NODISCARD std::size_t getItemCount() const;
 
 TGUI_NODISCARD String getItem(std::size_t index) const;
 
 TGUI_NODISCARD std::vector<String> getItemRow(std::size_t index) const;
 
 TGUI_NODISCARD String getItemCell(std::size_t rowIndex, std::size_t columnIndex) const;
 
 TGUI_NODISCARD std::vector<String> getItems() const;
 
 TGUI_NODISCARD 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);
 
 TGUI_NODISCARD unsigned int getItemHeight() const;
 
 void setHeaderTextSize(unsigned int textSize);
 
 TGUI_NODISCARD unsigned int getHeaderTextSize() const;
 
 void setSeparatorWidth(unsigned int width);
 
 TGUI_NODISCARD unsigned int getSeparatorWidth() const;
 
 void setHeaderSeparatorHeight(unsigned int height);
 
 TGUI_NODISCARD unsigned int getHeaderSeparatorHeight() const;
 
 void setGridLinesWidth(unsigned int width);
 
 TGUI_NODISCARD unsigned int getGridLinesWidth() const;
 
 void setAutoScroll(bool autoScroll);
 
 TGUI_NODISCARD bool getAutoScroll() const;
 
 void setShowVerticalGridLines(bool showGridLines);
 
 TGUI_NODISCARD bool getShowVerticalGridLines() const;
 
 void setShowHorizontalGridLines(bool showGridLines);
 
 TGUI_NODISCARD bool getShowHorizontalGridLines() const;
 
 TGUI_DEPRECATED("Use setColumnAutoExpanded and setColumnAutoResize instead") void setExpandLastColumn(bool expand);
 
 TGUI_DEPRECATED("Use ColumnAutoExpanded and ColumnAutoResize setters and getters instead") TGUI_NODISCARD bool getExpandLastColumn() const;
 
 void setVerticalScrollbarPolicy(Scrollbar::Policy policy);
 
 TGUI_NODISCARD Scrollbar::Policy getVerticalScrollbarPolicy() const;
 
 void setHorizontalScrollbarPolicy(Scrollbar::Policy policy);
 
 TGUI_NODISCARD Scrollbar::Policy getHorizontalScrollbarPolicy() const;
 
 void setVerticalScrollbarValue(unsigned int value);
 
 TGUI_NODISCARD unsigned int getVerticalScrollbarValue() const;
 
 void setHorizontalScrollbarValue(unsigned int value);
 
 TGUI_NODISCARD unsigned int getHorizontalScrollbarValue() const;
 
 void setFixedIconSize(Vector2f iconSize);
 
 TGUI_NODISCARD Vector2f getFixedIconSize() const;
 
 void setResizableColumns(bool resizable);
 
 TGUI_NODISCARD bool getResizableColumns() const;
 
 TGUI_NODISCARD bool isMouseOnWidget(Vector2f pos) const override;
 
 bool leftMousePressed(Vector2f pos) override;
 
 void leftMouseReleased(Vector2f pos) override;
 
 void rightMousePressed(Vector2f pos) override;
 
 void mouseMoved(Vector2f pos) override;
 
 bool scrolled(float delta, Vector2f pos, bool touch) override;
 
 void mouseNoLongerOnWidget() override;
 
 void leftMouseButtonNoLongerDown() override;
 
 void keyPressed(const Event::KeyEvent& event) override;
 
 bool canHandleKeyPress(const Event::KeyEvent& event) override;
 
 void draw(BackendRenderTarget& target, RenderStates states) const override;
 
 protected:
 
 TGUI_NODISCARD Signal& getSignal(String signalName) override;
 
 void rendererChanged(const String& property) override;
 
 TGUI_NODISCARD std::unique_ptr<DataIO::Node> save(SavingRenderersMap& renderers) const override;
 
 void load(const std::unique_ptr<DataIO::Node>& node, const LoadingRenderersMap& renderers) override;
 
 void mouseEnteredWidget() override;
 
 void mouseLeftWidget() override;
 
 void updateTextSize() override;
 
 // Returns the size without the borders
 TGUI_NODISCARD Vector2f getInnerSize() const;
 
 // Create a Text object for an item from the given caption, using the preset color, font, text size and opacity
 TGUI_NODISCARD 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
 TGUI_NODISCARD 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
 TGUI_NODISCARD 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);
 
 // Updates which item is the widest in the given column, by calculating the width of each item
 bool updateWidestItemInColumn(std::size_t columnIndex);
 
 // Updates which item is the widest in the given column, when only one item has changed in width
 bool updateWidestItemInColumn(std::size_t columnIndex, std::size_t itemIndex);
 
 // Updates which item is the widest in all columns, by calculating the width of each item
 bool updateWidestItem();
 
 // Updates which item is the widest in all columns, when only one item has changed in width
 bool updateWidestItem(std::size_t itemIndex);
 
 // This function needs to be called when items are inserted into the list. If the widest item for each column is located
 // below the inserted item then it's index needs to be updated.
 void incrementWidestItemIndices(std::size_t itemIndex);
 
 // Recalculates the width of each column if they don't have a fixed width. For auto-resized columns, the widest item
 // should have already been updated in each column before this function is called.
 void updateColumnWidths();
 
 // Returns whether at least one column potentially has its width expanded to fill the list view
 bool hasExpandedColumn() const;
 
 // 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.
 TGUI_NODISCARD 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.
 TGUI_NODISCARD 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.
 TGUI_NODISCARD int getColumnIndexBelowMouse(float mouseLeft);
 
 // Returns whether the mouse is standing between two columns.
 // If true then columnIndex is set to the index of border below the mouse (1 is the border between first two columns).
 // If false then columnIndex remains unchanged.
 TGUI_NODISCARD bool findBorderBelowMouse(Vector2f pos, std::size_t& columnIndex) const;
 
 // Recalculate the size and viewport size of the scrollbars
 void updateScrollbars();
 
 // Recalculate the maximum value for the vertical scrollbar
 void updateVerticalScrollbarMaximum();
 
 // Draw the header text for a single column
 void drawHeaderText(BackendRenderTarget& target, RenderStates states, float columnWidth, float headerHeight, std::size_t column) const;
 
 // Draw the texts in a single column
 void drawColumn(BackendRenderTarget& 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
 TGUI_NODISCARD Widget::Ptr clone() const override;
 
 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_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_widestItemWidth = 0; // If there are no columns, this is the maximum width from all items
 std::size_t m_widestItemIndex = std::numeric_limits<std::size_t>::max(); // If there are no columns, this is the index of the item with the maximum width
 bool m_headerVisible = true;
 bool m_showHorizontalGridLines = false;
 bool m_showVerticalGridLines = true;
 bool m_expandLastColumn = false; // TGUI_NEXT: Remove this property
 bool m_multiSelect = false;
 bool m_resizableColumns = false;
 Vector2f m_fixedIconSize;
 Cursor::Type m_currentListViewMouseCursor = Cursor::Type::Arrow;
 std::size_t m_resizingColumn = 0;
 float m_resizingColumnLastMouseX = 0;
 
 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?
 
 Sprite m_spriteHeaderBackground;
 Sprite m_spriteBackground;
 
 // 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