Widget.hpp

//
// TGUI - Texus' Graphical User Interface
// Copyright (C) 2012-2020 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/Sprite.hpp>
#include <TGUI/Layout.hpp>
#include <TGUI/String.hpp>
#include <TGUI/Vector2.hpp>
#include <TGUI/Duration.hpp>
#include <TGUI/Any.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/Aurora/SmartPtr/CopiedPtr.hpp>
#include <TGUI/Aurora/Tools/Downcast.hpp>
 
#include <SFML/System/Time.hpp>
#include <SFML/Window/Event.hpp>
#include <SFML/Graphics/RenderTarget.hpp>
 
#include <unordered_set>
 
 
namespace tgui
{
 class Container;
 
 enum class ShowAnimationType;
 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();
 
 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)});
 }
 
 
 Vector2f getSize() const
 {
 return m_size.getValue();
 }
 
 
 virtual Vector2f getFullSize() const;
 
 
 virtual Vector2f getAbsolutePosition() const;
 
 
 virtual Vector2f getWidgetOffset() const;
 
 
 void showWithEffect(ShowAnimationType type, Duration duration);
 
 
 void hideWithEffect(ShowAnimationType type, 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;
 }
 
 
 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;
 
 
 virtual void setTextSize(unsigned int size);
 
 
 virtual unsigned int getTextSize() const;
 
 
 void setToolTip(Widget::Ptr toolTip);
 
 
 Widget::Ptr getToolTip() const;
 
 
 void setWidgetName(const String& name);
 
 
 String getWidgetName() const;
 
 
 void setFocusable(bool focusable);
 
 
 bool isFocusable() const;
 
 
 virtual bool canGainFocus() const;
 
 
 bool isContainer() const;
 
 
 virtual Signal& getSignal(String signalName);
 
 
 virtual void setParent(Container* parent);
 
 
 virtual void update(Duration elapsedTime);
 
 
 virtual bool mouseOnWidget(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(sf::Mouse::Button button, Vector2f pos);
 
 virtual void mouseReleased(sf::Mouse::Button button, Vector2f pos);
 
 virtual void mouseMoved(Vector2f pos);
 
 virtual void keyPressed(const sf::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(sf::RenderTarget& target, sf::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 mouseEnteredWidget();
 
 
 virtual void mouseLeftWidget();
 
 
 // Draw a rectangle shape with the right opacity
 void drawRectangleShape(sf::RenderTarget& target,
 const sf::RenderStates& states,
 Vector2f size,
 Color color) const;
 
 
 // Draw the borders around the widget
 void drawBorders(sf::RenderTarget& target,
 const sf::RenderStates& states,
 const Borders& borders,
 Vector2f size,
 Color color) const;
 
 
 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"}; 
 SignalAnimation onAnimationFinish = {"AnimationFinished"}; 
 
 
 protected:
 
 String m_type;
 String m_name;
 
 Layout2d m_position;
 Layout2d m_size;
 unsigned int m_textSize = 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;
 
 // 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 = aurora::makeCopied<WidgetRenderer>();
 
 // 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 = getGlobalFont();
 float m_opacityCached = 1;
 bool m_transparentTextureCached = false;
 
 Any m_userData;
 
 std::function<void(const String& property)> m_rendererChangedCallback = [this](const String& property){ rendererChangedCallback(property); };
 
 
 
 friend class Container; // Container accesses m_mouseDown, m_draggableWidget, save and load
 };
 
}
 
 
#endif // TGUI_WIDGET_HPP