Widget.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_WIDGET_HPP
#define TGUI_WIDGET_HPP
 
 
#include <TGUI/Signal.hpp>
#include <TGUI/Font.hpp>
#include <TGUI/Sprite.hpp>
#include <TGUI/Layout.hpp>
#include <TGUI/String.hpp>
#include <TGUI/Vector2.hpp>
#include <TGUI/Duration.hpp>
#include <TGUI/Cursor.hpp>
#include <TGUI/Event.hpp>
#include <TGUI/Any.hpp>
#include <TGUI/Backend/Renderer/BackendRenderTarget.hpp>
#include <TGUI/Loading/Theme.hpp>
#include <TGUI/Loading/DataIO.hpp>
#include <TGUI/Loading/Serializer.hpp>
#include <TGUI/Loading/Deserializer.hpp>
#include <TGUI/Renderers/WidgetRenderer.hpp>
#include <TGUI/extlibs/Aurora/SmartPtr/CopiedPtr.hpp>
#include <TGUI/extlibs/Aurora/Tools/Downcast.hpp>
 
#include <unordered_set>
 
 
namespace tgui
{
    class BackendGui;
    class Container;
 
    enum class ShowEffectType;
    namespace priv
    {
        class Animation;
    }
 
 
    class TGUI_API Widget : public std::enable_shared_from_this<Widget>
    {
    public:
 
        typedef std::shared_ptr<Widget> Ptr; 
        typedef std::shared_ptr<const Widget> ConstPtr; 
 
 
        Widget(const char* typeName, bool initRenderer);
 
 
        Widget(const Widget&);
 
        Widget(Widget&&);
 
        virtual ~Widget();
 
        Widget& operator=(const Widget&);
 
        Widget& operator=(Widget&&);
 
 
        void setRenderer(std::shared_ptr<RendererData> rendererData);
 
 
        WidgetRenderer* getSharedRenderer();
        const WidgetRenderer* getSharedRenderer() const;
 
        WidgetRenderer* getRenderer();
        const WidgetRenderer* getRenderer() const;
 
 
        virtual void setPosition(const Layout2d& position);
 
 
        void setPosition(Layout x, Layout y)
        {
            setPosition({std::move(x), std::move(y)});
        }
 
 
        Vector2f getPosition() const
        {
            return m_position.getValue();
        }
 
 
        virtual void setSize(const Layout2d& size);
 
 
        void setSize(Layout width, Layout height)
        {
            setSize({std::move(width), std::move(height)});
        }
 
 
        void setWidth(Layout width)
        {
            setSize({std::move(width), m_size.y});
        }
 
 
        void setHeight(Layout height)
        {
            setSize({m_size.x, std::move(height)});
        }
 
 
        Vector2f getSize() const
        {
            return m_size.getValue();
        }
 
 
        virtual Vector2f getFullSize() const;
 
 
        virtual Vector2f getAbsolutePosition() const;
 
 
        virtual Vector2f getWidgetOffset() const;
 
 
        void setOrigin(float x, float y)
        {
            setOrigin({x, y});
        }
 
 
        void setOrigin(Vector2f origin);
 
 
        Vector2f getOrigin() const
        {
            return m_origin;
        }
 
 
        void setScale(Vector2f scaleFactors);
 
 
        void setScale(Vector2f scaleFactors, Vector2f origin);
 
 
 
        void setScale(float scaleFactor)
        {
            setScale({scaleFactor, scaleFactor});
        }
 
 
        void setScale(float scaleFactor, Vector2f origin)
        {
            setScale({scaleFactor, scaleFactor}, origin);
        }
 
 
        Vector2f getScale() const
        {
            return m_scaleFactors;
        }
 
 
        Vector2f getScaleOrigin() const;
 
 
        void setRotation(float angle);
 
 
        void setRotation(float angle, Vector2f origin);
 
 
        float getRotation() const
        {
            return m_rotationDeg;
        }
 
 
        Vector2f getRotationOrigin() const;
 
 
        void showWithEffect(ShowEffectType type, Duration duration);
 
 
        void hideWithEffect(ShowEffectType type, Duration duration);
 
 
        void moveWithAnimation(Layout2d position, Duration duration);
 
 
        void resizeWithAnimation(Layout2d size, Duration duration);
 
 
        virtual void setVisible(bool visible);
 
 
        bool isVisible() const
        {
            return m_visible;
        }
 
 
        virtual void setEnabled(bool enabled);
 
 
        bool isEnabled() const
        {
            return m_enabled;
        }
 
 
        virtual void setFocused(bool focused);
 
 
        bool isFocused() const
        {
            return m_focused;
        }
 
 
        const String& getWidgetType() const;
 
 
        Container* getParent() const
        {
            return m_parent;
        }
 
 
        BackendGui* getParentGui() const
        {
            return m_parentGui;
        }
 
 
        bool isAnimationPlaying() const;
 
 
        void moveToFront();
 
 
        void moveToBack();
 
 
        void setUserData(Any userData)
        {
            m_userData = std::move(userData);
        }
 
        template <typename T>
        T getUserData() const
        {
            return AnyCast<T>(m_userData);
        }
 
 
        void setInheritedFont(const Font& font);
 
 
        const Font& getInheritedFont() const;
 
 
        void setInheritedOpacity(float opacity);
 
 
        float getInheritedOpacity() const;
 
 
        void setTextSize(unsigned int size);
 
 
        unsigned int getTextSize() const;
 
 
        void setToolTip(Widget::Ptr toolTip);
 
 
        Widget::Ptr getToolTip() const;
 
 
        void setWidgetName(const String& name);
 
 
        String getWidgetName() const;
 
 
        void setMouseCursor(Cursor::Type cursor);
 
 
        Cursor::Type getMouseCursor() const;
 
 
        void setFocusable(bool focusable);
 
 
        bool isFocusable() const;
 
 
        void finishAllAnimations();
 
 
        virtual bool canGainFocus() const;
 
 
        bool isContainer() const;
 
 
        bool isDraggableWidget() const;
 
 
        bool isMouseDown() const;
 
 
        virtual Signal& getSignal(String signalName);
 
 
        virtual void setParent(Container* parent);
 
 
        virtual bool updateTime(Duration elapsedTime);
 
 
        virtual bool isMouseOnWidget(Vector2f pos) const = 0;
 
        virtual void leftMousePressed(Vector2f pos);
 
        virtual void leftMouseReleased(Vector2f pos);
 
        virtual void rightMousePressed(Vector2f pos);
 
        virtual void rightMouseReleased(Vector2f pos);
 
        virtual void mousePressed(Event::MouseButton button, Vector2f pos);
 
        virtual void mouseReleased(Event::MouseButton button, Vector2f pos);
 
        virtual void mouseMoved(Vector2f pos);
 
        virtual void keyPressed(const Event::KeyEvent& event);
 
        virtual void textEntered(char32_t key);
 
        virtual bool mouseWheelScrolled(float delta, Vector2f pos);
 
        virtual void mouseNoLongerOnWidget();
 
        virtual void leftMouseButtonNoLongerDown();
 
        virtual void rightMouseButtonNoLongerDown();
 
 
        // Show the tool tip when the widget is located below the mouse.
        // Returns its tool tip or the tool tip from a child widget if the mouse is on top of the widget.
        // A nullptr is returned when the mouse is not on top of the widget or when the tool tip is empty.
        virtual Widget::Ptr askToolTip(Vector2f mousePos);
 
 
        const Layout2d& getPositionLayout() const
        {
            return m_position;
        }
 
 
        const Layout2d& getSizeLayout() const
        {
            return m_size;
        }
 
 
        void bindPositionLayout(Layout* layout);
 
 
        void unbindPositionLayout(Layout* layout);
 
 
        void bindSizeLayout(Layout* layout);
 
 
        void unbindSizeLayout(Layout* layout);
 
 
        virtual void draw(BackendRenderTarget& target, RenderStates states) const = 0;
 
 
        template <typename WidgetType>
        std::shared_ptr<const WidgetType> cast() const
        {
            return std::dynamic_pointer_cast<const WidgetType>(shared_from_this());
        }
 
 
        template <typename WidgetType>
        std::shared_ptr<WidgetType> cast()
        {
            return std::dynamic_pointer_cast<WidgetType>(shared_from_this());
        }
 
 
        virtual Widget::Ptr clone() const = 0;
 
 
    protected:
 
        using SavingRenderersMap = std::map<const Widget*, std::pair<std::unique_ptr<DataIO::Node>, String>>;
        using LoadingRenderersMap = std::map<String, std::shared_ptr<RendererData>>;
 
 
        virtual void rendererChanged(const String& property);
 
 
        virtual std::unique_ptr<DataIO::Node> save(SavingRenderersMap& renderers) const;
 
 
        virtual void load(const std::unique_ptr<DataIO::Node>& node, const LoadingRenderersMap& renderers);
 
 
        virtual void updateTextSize();
 
 
        virtual void mouseEnteredWidget();
 
 
        virtual void mouseLeftWidget();
 
 
    private:
 
        // Callback function which is called on a renderer change and which calls the virtual rendererChanged function
        void rendererChangedCallback(const String& property);
 
 
    public:
 
        SignalVector2f      onPositionChange   = {"PositionChanged"};         
        SignalVector2f      onSizeChange       = {"SizeChanged"};             
        Signal              onFocus            = {"Focused"};                 
        Signal              onUnfocus          = {"Unfocused"};               
        Signal              onMouseEnter       = {"MouseEntered"};            
        Signal              onMouseLeave       = {"MouseLeft"};               
        SignalShowEffect    onShowEffectFinish = {"ShowEffectFinished"};      
 
        SignalAnimationType onAnimationFinish  = {"AnimationFinished"};
 
    protected:
 
        String m_type;
        String m_name;
 
        Layout2d m_position;
        Layout2d m_size;
        unsigned int m_textSize = 0; // This may be overwritten by the renderer, m_textSizeCached contains the actual text size
 
        Vector2f m_origin;
        Optional<Vector2f> m_rotationOrigin;
        Optional<Vector2f> m_scaleOrigin;
        Vector2f m_scaleFactors = {1, 1};
        float m_rotationDeg = 0;
 
        // The previous position and size have to be stored because when setPosition/setSize is called, the layout may already be
        // changed and there would be no way for the widget to detect whether the values changed or not.
        Vector2f m_prevPosition;
        Vector2f m_prevSize;
 
        // Layouts that need to recalculate their value when the position or size of this widget changes
        std::unordered_set<Layout*> m_boundPositionLayouts;
        std::unordered_set<Layout*> m_boundSizeLayouts;
 
        // When a widget is disabled, it will no longer receive events
        bool m_enabled = true;
 
        // Is the widget visible? When it is invisible it will not receive events and it won't be drawn.
        bool m_visible = true;
 
        // This will point to our parent widget. If there is no parent then this will be nullptr.
        Container* m_parent = nullptr;
        BackendGui* m_parentGui = nullptr;
 
        // Is the mouse on top of the widget? Did the mouse go down on the widget?
        bool m_mouseHover = false;
        bool m_mouseDown = false;
 
        // Is the widget focused?
        bool m_focused = false;
 
        // Can the widget be focused?
        bool m_focusable = true;
 
        // Keep track of the elapsed time.
        Duration m_animationTimeElapsed;
 
        // This is set to true for widgets that have something to be dragged around (e.g. sliders and scrollbars)
        bool m_draggableWidget = false;
 
        // This is set to true for widgets that store other widgets inside them
        bool m_containerWidget = false;
 
        // The tool tip connected to the widget
        Widget::Ptr m_toolTip = nullptr;
 
        // Renderer of the widget
        aurora::CopiedPtr<WidgetRenderer> m_renderer = nullptr;
 
        // Show animations
        std::vector<std::shared_ptr<priv::Animation>> m_showAnimations;
 
        // Renderer properties that can be passed from containers to their children
        Font m_inheritedFont;
        float m_inheritedOpacity = 1;
 
        // Cached renderer properties
        Font  m_fontCached = Font::getGlobalFont();
        float m_opacityCached = 1;
        bool m_transparentTextureCached = false;
        unsigned int m_textSizeCached = 0;
 
        Any m_userData;
        Cursor::Type m_mouseCursor = Cursor::Type::Arrow;
 
        std::function<void(const String& property)> m_rendererChangedCallback = [this](const String& property){ rendererChangedCallback(property); };
 
 
 
        friend class Container; // Container accesses save and load functions
    };
 
}
 
 
#endif // TGUI_WIDGET_HPP