TreeView.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_TREE_VIEW_HPP
#define TGUI_TREE_VIEW_HPP
 
#include <TGUI/CopiedSharedPtr.hpp>
#include <TGUI/Widgets/Scrollbar.hpp>
#include <TGUI/Renderers/TreeViewRenderer.hpp>
#include <TGUI/Text.hpp>
 
 
namespace tgui
{
    class TGUI_API TreeView : public Widget
    {
    public:
 
        typedef std::shared_ptr<TreeView> Ptr;
        typedef std::shared_ptr<const TreeView> ConstPtr;
 
        struct ConstNode
        {
            bool expanded;
            String text;
            std::vector<ConstNode> nodes;
        };
 
        struct Node
        {
            Text text;
            unsigned depth = 0;
            bool expanded = true;
            Node* parent = nullptr;
            std::vector<std::shared_ptr<Node>> nodes;
        };
 
 
        TreeView(const char* typeName = "TreeView", bool initRenderer = true);
 
 
        // Copy constructor
        TreeView(const TreeView&);
 
        // Move constructor
        TreeView(TreeView&&) = default;
 
        // Overload of copy assignment operator
        TreeView& operator=(const TreeView&);
 
        // Overload of move assignment operator
        TreeView& operator=(TreeView&&) = default;
 
 
        static TreeView::Ptr create();
 
 
        static TreeView::Ptr copy(TreeView::ConstPtr treeView);
 
 
        TreeViewRenderer* getSharedRenderer();
        const TreeViewRenderer* getSharedRenderer() const;
 
 
        TreeViewRenderer* getRenderer();
        const TreeViewRenderer* getRenderer() const;
 
 
        void setSize(const Layout2d& size) override;
        using Widget::setSize;
 
 
        bool addItem(const std::vector<String>& hierarchy, bool createParents = true);
 
 
        void expand(const std::vector<String>& hierarchy);
 
 
        void expandAll();
 
 
        void collapse(const std::vector<String>& hierarchy);
 
 
        void collapseAll();
 
 
        bool selectItem(const std::vector<String>& hierarchy);
 
 
        void deselectItem();
 
 
        bool removeItem(const std::vector<String>& hierarchy, bool removeParentsWhenEmpty = true);
 
 
        void removeAllItems();
 
 
        std::vector<String> getSelectedItem() const;
 
 
        std::vector<ConstNode> getNodes() const;
 
 
        void setItemHeight(unsigned int itemHeight);
 
 
        unsigned int getItemHeight() const;
 
 
        void setTextSize(unsigned int textSize) override;
 
 
        void setVerticalScrollbarValue(unsigned int value);
 
 
        unsigned int getVerticalScrollbarValue() const;
 
 
        void setHorizontalScrollbarValue(unsigned int value);
 
 
        unsigned int getHorizontalScrollbarValue() 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 markNodesDirty();
 
 
        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;
 
 
        // Updates the bounds of the icons
        void updateIconBounds();
 
 
        // 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<TreeView>(*this);
        }
 
 
        void updateTextColors(std::vector<std::shared_ptr<Node>>& nodes);
 
 
        void createNode(std::vector<std::shared_ptr<Node>>& menus, Node* parent, const String& text);
 
 
        Node* findParentNode(const std::vector<String>& hierarchy, unsigned int parentIndex, std::vector<std::shared_ptr<Node>>& nodes, Node* parent, bool createParents);
 
 
        // Expands or collapses one of the visible items
        void toggleNodeInternal(std::size_t index);
 
 
        // Expands or collapses a node
        bool expandOrCollapse(const std::vector<String>& hierarchy, bool expand);
 
 
        // Helper function to load the items from a text file
        void loadItems(const std::unique_ptr<DataIO::Node>& node, std::vector<std::shared_ptr<Node>>& items, Node* parent);
 
 
        // Rebuilds the list of visible items and positions the texts
        unsigned int updateVisibleNodes(std::vector<std::shared_ptr<Node>>& nodes, Node* selectedNode, float textPadding, unsigned int pos);
 
 
        // Updates the text colors of the selected and hovered items
        void updateSelectedAndHoveringItemColors();
 
 
        // Updates the text color of the hovered item
        void updateHoveredItem(int item);
 
 
        // Updates the text color of the selected item
        void updateSelectedItem(int item);
 
 
    public:
 
        SignalItemHierarchy onItemSelect = {"ItemSelected"};   
        SignalItemHierarchy onDoubleClick = {"DoubleClicked"}; 
        SignalItemHierarchy onExpand = {"Expanded"};           
        SignalItemHierarchy onCollapse = {"Collapsed"};        
        SignalItemHierarchy onRightClick = {"RightClicked"};   
 
    protected:
 
        // This contains the nodes of the tree
        std::vector<std::shared_ptr<Node>> m_nodes;
        std::vector<std::shared_ptr<Node>> m_visibleNodes;
 
        int m_selectedItem = -1;
        int m_hoveredItem = -1;
 
        // The size must be stored
        unsigned int m_itemHeight = 0;
        unsigned int m_requestedTextSize = 0;
        float m_maxRight = 0;
 
        Vector2f m_iconBounds;
 
        CopiedSharedPtr<ScrollbarChildWidget> m_verticalScrollbar;
        CopiedSharedPtr<ScrollbarChildWidget> m_horizontalScrollbar;
 
 
        bool m_possibleDoubleClick = false;
        int m_doubleClickNodeIndex = -1;
 
        Sprite    m_spriteBranchExpanded;
        Sprite    m_spriteBranchCollapsed;
        Sprite    m_spriteLeaf;
 
        // Cached renderer properties
        Borders   m_bordersCached;
        Borders   m_paddingCached;
        Color     m_borderColorCached;
        Color     m_backgroundColorCached;
        Color     m_textColorCached;
        Color     m_textColorHoverCached;
        Color     m_selectedTextColorCached;
        Color     m_selectedTextColorHoverCached;
        Color     m_selectedBackgroundColorCached;
        Color     m_selectedBackgroundColorHoverCached;
        Color     m_backgroundColorHoverCached;
        TextStyles m_textStyleCached;
 
    };
 
}
 
 
#endif // TGUI_TREE_VIEW_HPP