axmol/cocos/ui/UIWidget.h

/****************************************************************************
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
Copyright (c) 2020 c4games.com.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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****************************************************************************/

#ifndef __UIWIDGET_H__
#define __UIWIDGET_H__

#include "2d/CCProtectedNode.h"
#include "ui/UILayoutParameter.h"
#include "ui/GUIDefine.h"
#include "ui/GUIExport.h"
#include "base/CCMap.h"

/**
 * @addtogroup ui
 * @{
 */
NS_CC_BEGIN

class EventListenerTouchOneByOne;
class Camera;

namespace ui {
    class LayoutComponent;

/**
 *@brief Base class for all ui widgets.
 * This class inherent from `ProtectedNode` and `LayoutParameterProtocol`.
 * If you want to implements your own ui widget, you should subclass it.
 */
class CC_GUI_DLL Widget : public ProtectedNode, public LayoutParameterProtocol
{
public:
    /**
     * Widget focus direction.
     */
    enum class FocusDirection
    {
        LEFT,
        RIGHT,
        UP,
        DOWN
    };
    
    /**
     * Widget position type for layout.
     */
    enum class PositionType
    {
        ABSOLUTE,
        PERCENT
    };
    
    /**
     * Widget size type for layout.
     */
    enum class SizeType
    {
        ABSOLUTE,
        PERCENT
    };
    
    /**
     * Touch event type.
     */
    enum class TouchEventType
    {
        BEGAN,
        MOVED,
        ENDED,
        CANCELED
    };
    
    /**
     * Texture resource type.
     * - LOCAL:  It means the texture is loaded from image.
     * - PLIST: It means the texture is loaded from texture atlas.
     */
    enum class TextureResType
    {
        LOCAL = 0,
        PLIST = 1
    };
    
    /**
     * Widget bright style.
     */
    enum class BrightStyle
    {
        NONE = -1,
        NORMAL,
        HIGHLIGHT
    };

    
    /**
     * Widget touch event callback.
     */
    typedef std::function<void(Ref*,Widget::TouchEventType)> ccWidgetTouchCallback;
    /**
     * Widget click event callback.
     */
    typedef std::function<void(Ref*)> ccWidgetClickCallback;
    /**
     * Widget custom event callback.
     * It is mainly used together with Cocos Studio.
     */
    typedef std::function<void(Ref*, int)> ccWidgetEventCallback;
    /**
     * Default constructor
     * @js ctor
     * @lua new
     */
    Widget();
    
    /**
     * Default destructor
     * @js NA
     * @lua NA
     */
    virtual ~Widget();
    /**
     * Create and return a empty Widget instance pointer.
     */
    static Widget* create();

    /**
     * Sets whether the widget is enabled
     * 
     * true if the widget is enabled, widget may be touched , false if the widget is disabled, widget cannot be touched.
     *
     * Note: If you want to change the widget's appearance  to disabled state, you should also call  `setBright(false)`.
     *
     * The default value is true, a widget is default to enable touch.
     *
     * @param enabled Set to true to enable touch, false otherwise.
     */
    virtual void setEnabled(bool enabled);

    /**
     * Determines if the widget is enabled or not.
     *
     * @return true if the widget is enabled, false if the widget is disabled.
     */
    bool isEnabled() const;

    /**
     * Sets whether the widget is bright
     *
     * The default value is true, a widget is default to bright
     *
     * @param bright   true if the widget is bright, false if the widget is dark.
     */
    void setBright(bool bright);

    /**
     * Determines if the widget is bright
     *
     * @return true if the widget is bright, false if the widget is dark.
     */
    bool isBright() const;

    /**
     * Sets whether the widget is touch enabled.
     *
     * The default value is false, a widget is default to touch disabled.
     *
     * @param enabled   True if the widget is touch enabled, false if the widget is touch disabled.
     */
    virtual void setTouchEnabled(bool enabled);

    /**
     * To set the bright style of widget.
     *
     * @see BrightStyle
     *
     * @param style   BrightStyle::NORMAL means the widget is in normal state, BrightStyle::HIGHLIGHT means the widget is in highlight state.
     */
    void setBrightStyle(BrightStyle style);

    /**
     * Determines if the widget is touch enabled
     *
     * @return true if the widget is touch enabled, false if the widget is touch disabled.
     */
    bool isTouchEnabled() const;

    /**
     * Determines if the widget is highlighted
     *
     * @return true if the widget is highlighted, false if the widget is not highlighted.
     */
    bool isHighlighted() const;

    /**
     * Sets whether the widget is highlighted
     *
     * The default value is false, a widget is default to not highlighted
     *
     * @param highlight   true if the widget is highlighted, false if the widget is not highlighted.
     */
    void setHighlighted(bool highlight);

    /**
     * Gets the left boundary position of this widget in parent's coordination system.
     * @return The left boundary position of this widget.
     */
    float getLeftBoundary() const;

    /**
     * Gets the bottom boundary position of this widget in parent's coordination system.
     * @return The bottom boundary position of this widget.
     */
    float getBottomBoundary() const;

    /**
     * Gets the right boundary position of this widget in parent's coordination system.
     * @return The right boundary position of this widget.
     */
    float getRightBoundary() const;

    /**
     * Gets the top boundary position of this widget in parent's coordination system.
     * @return The top boundary position of this widget.
     */
    float getTopBoundary() const;

    /**
     * @js NA
     */
    virtual void visit(cocos2d::Renderer *renderer, const Mat4 &parentTransform, uint32_t parentFlags) override;

    /**
     * Set a callback to touch vent listener.
     *@param callback  The callback in `ccWidgetEventCallback.`
     */
    void addTouchEventListener(const ccWidgetTouchCallback& callback);
    
    /**
     * Set a click event handler to the widget.
     * @param callback The callback in `ccWidgetClickCallback`.
     */
    void addClickEventListener(const ccWidgetClickCallback& callback);
    /**
     * Set a event handler to the widget in order to use cocostudio editor and framework
     * @param callback The callback in `ccWidgetEventCallback`.
     * @lua NA
     */
    virtual void addCCSEventListener(const ccWidgetEventCallback& callback);
    /**/

    /**
     * Changes the position (x,y) of the widget in OpenGL coordinates
     *
     * Usually we use p(x,y) to compose a Vec2 object.
     * The original point (0,0) is at the left-bottom corner of screen.
     *
     * @param pos  The position (x,y) of the widget in OpenGL coordinates
     */
    virtual void setPosition(const Vec2 &pos) override;

    /**
     * Set the percent(x,y) of the widget in OpenGL coordinates
     *
     * @param percent  The percent (x,y) of the widget in OpenGL coordinates
     */
    void setPositionPercent(const Vec2 &percent);

    /**
     * Gets the percent (x,y) of the widget in OpenGL coordinates
     *
     * @see setPosition(const Vec2&)
     *
     * @return The percent (x,y) of the widget in OpenGL coordinates
     */
    const Vec2& getPositionPercent();

    /**
     * Changes the position type of the widget
     *
     * @see `PositionType`
     *
     * @param type  the position type of widget
     */
    void setPositionType(PositionType type);

    /**
     * Gets the position type of the widget
     *
     * @see `PositionType`
     *
     * @return type  the position type of widget
     */
    PositionType getPositionType() const;

    /**
     * Sets whether the widget should be flipped horizontally or not.
     *
     * @param flippedX true if the widget should be flipped horizontally, false otherwise.
     */
    virtual void setFlippedX(bool flippedX);

    /**
     * Returns the flag which indicates whether the widget is flipped horizontally or not.
     *
     * It not only flips the texture of the widget, but also the texture of the widget's children.
     * Also, flipping relies on widget's anchor point.
     * Internally, it just use setScaleX(-1) to flip the widget.
     *
     * @return true if the widget is flipped horizontally, false otherwise.
     */
    virtual bool isFlippedX()const{return _flippedX;};

    /**
     * Sets whether the widget should be flipped vertically or not.
     *
     * @param flippedY true if the widget should be flipped vertically, false otherwise.
     */
    virtual void setFlippedY(bool flippedY);

    /**
     * Return the flag which indicates whether the widget is flipped vertically or not.
     *
     * It not only flips the texture of the widget, but also the texture of the widget's children.
     * Also, flipping relies on widget's anchor point.
     * Internally, it just use setScaleY(-1) to flip the widget.
     *
     * @return true if the widget is flipped vertically, false otherwise.
     */
    virtual bool isFlippedY()const{return _flippedY;};

    //override the setScale function of Node
    virtual void setScaleX(float scaleX) override;
    virtual void setScaleY(float scaleY) override;
    virtual void setScale(float scale) override;
    virtual void setScale(float scalex, float scaley) override;
    using Node::setScaleZ;
    virtual float getScaleX() const override;
    virtual float getScaleY() const override;
    virtual float getScale() const override;
    using Node::getScaleZ;

    /**
     * Checks a point if in parent's area.
     *
     * @param pt A point in `Vec2`.
     * @return true if the point is in parent's area, false otherwise.
     */
    bool isClippingParentContainsPoint(const Vec2& pt);

    /**
     * Gets the touch began point of widget when widget is selected.
     * @return the touch began point.
     */
    const Vec2& getTouchBeganPosition()const;

    /*
     * Gets the touch move point of widget when widget is selected.
     * @return the touch move point.
     */
    const Vec2& getTouchMovePosition()const;

    /*
     * Gets the touch end point of widget when widget is selected.
     * @return the touch end point.
     */
    const Vec2& getTouchEndPosition()const;

    /**
     * Changes the size that is widget's size
     * @param contentSize A content size in `Size`.
     */
    virtual void setContentSize(const Size& contentSize) override;

    /**
     * Changes the percent that is widget's percent size
     *
     * @param percent that is widget's percent size
     */
    virtual void setSizePercent(const Vec2 &percent);

    /**
     * Changes the size type of widget.
     *
     * @see `SizeType`
     *
     * @param type that is widget's size type
     */
    void setSizeType(SizeType type);

    /**
     * Gets the size type of widget.
     *
     * @see `SizeType`
     */
    SizeType getSizeType() const;
    
    /**
     * Get the user defined widget size.
     *@return User defined size.
     */
    const Size& getCustomSize() const;
    
    /**
     * Get the content size of widget.
     * @warning This API exists mainly for keeping back compatibility.
     * @return 
     */
    virtual const Size& getLayoutSize() {return _contentSize;};

    /**
     * Get size percent of widget.
     *
     * @return Percent size.
     */
    const Vec2& getSizePercent();

    /**
     * Checks a point is in widget's content space.
     * This function is used for determining touch area of widget.
     *
     * @param pt        The point in `Vec2`.
     * @param camera    The camera look at widget, used to convert GL screen point to near/far plane.
     * @param p         Point to a Vec3 for store the intersect point, if don't need them set to nullptr.
     * @return true if the point is in widget's content space, false otherwise.
     */
    virtual bool hitTest(const Vec2 &pt, const Camera* camera, Vec3 *p) const;

    /**
     * A callback which will be called when touch began event is issued.
     *@param touch The touch info.
     *@param unusedEvent The touch event info.
     *@return True if user want to handle touches, false otherwise.
     */
    virtual bool onTouchBegan(Touch *touch, Event *unusedEvent);

    /**
     * A callback which will be called when touch moved event is issued.
     *@param touch The touch info.
     *@param unusedEvent The touch event info.
     */
    virtual void onTouchMoved(Touch *touch, Event *unusedEvent);

    /**
     * A callback which will be called when touch ended event is issued.
     *@param touch The touch info.
     *@param unusedEvent The touch event info.
     */
    virtual void onTouchEnded(Touch *touch, Event *unusedEvent);

    /**
     * A callback which will be called when touch cancelled event is issued.
     *@param touch The touch info.
     *@param unusedEvent The touch event info.
     */
    virtual void onTouchCancelled(Touch *touch, Event *unusedEvent);

    /**
     * Sets a LayoutParameter to widget.
     *
     * @see LayoutParameter
     * @param parameter LayoutParameter pointer
     */
    void setLayoutParameter(LayoutParameter* parameter);

    /**
     * Gets LayoutParameter of widget.
     *
     * @see LayoutParameter
     * @return LayoutParameter
     */
    LayoutParameter* getLayoutParameter()const override;

    /**
     * Toggle whether ignore user defined content size for widget.
     * Set true will ignore user defined content size which means 
     * the widget size is always equal to the return value of `getVirtualRendererSize`.
     *
     * @param ignore set member variable _ignoreSize to ignore
     */
    virtual void ignoreContentAdaptWithSize(bool ignore);

    /**
     * Query whether the widget ignores user defined content size or not
     *
     * @return True means ignore user defined content size, false otherwise.
     */
    bool isIgnoreContentAdaptWithSize() const;

    /**
     * Gets position of widget in world space.
     *
     * @return Position of widget in world space.
     */
    Vec2 getWorldPosition()const;

    /**
     * Gets the inner Renderer node of widget.
     *
     * For example, a button's Virtual Renderer is it's texture renderer.
     *
     * @return Node pointer.
     */
    virtual Node* getVirtualRenderer();


    /**
     *  Get the virtual renderer's size
     *@return Widget virtual renderer size.
     */
    virtual Size getVirtualRendererSize() const;
    

    /**
     * Returns the string representation of widget class name
     * @return get the class description.
     */
    virtual std::string getDescription() const override;

    /**
     * Create a new widget copy of the original one.
     * @return A cloned widget copy of original.
     */
    Widget* clone();
    /**
     * @lua NA
     */
    virtual void onEnter() override;
    
    /**
     * @lua NA
     */
    virtual void onExit() override;

    /**
     * Update all children's contents size and position recursively.
     * @see `updateSizeAndPosition(const Size&)`
     */
    void updateSizeAndPosition();

    /**
     * Update all children's contents size and position recursively.
     */
    void updateSizeAndPosition(const Size& parentSize);
    
    /**
     * Set the tag of action.
     *@param tag  A integer tag value.
     */
    void setActionTag(int tag);

    /**
     * Get the action tag.
     *@return Action tag.
     */
    int getActionTag()const;
    
    /**
     * @brief Allow widget touch events to propagate to its parents. Set false will disable propagation
     * @param isPropagate  True to allow propagation, false otherwise.
     * @since v3.3
     */
    void setPropagateTouchEvents(bool isPropagate);
    
    /**
     * Return whether the widget is propagate touch events to its parents or not
     * @return whether touch event propagation is allowed or not.
     * @since v3.3
     */
     
    bool isPropagateTouchEvents()const;
    
    /**
     * Toggle widget swallow touch option.
     * @brief Specify widget to swallow touches or not
     * @param swallow True to swallow touch, false otherwise.
     * @since v3.3
     */
    void setSwallowTouches(bool swallow);
    
    /**
     * Return whether the widget is swallowing touch or not
     * @return Whether touch is swallowed.
     * @since v3.3
     */
    bool isSwallowTouches()const;
    
    /**
     * Query whether widget is focused or not.
     *@return  whether the widget is focused or not
     */
    bool isFocused()const;
    
    /**
     * Toggle widget focus status.
     *@param focus  pass true to let the widget get focus or pass false to let the widget lose focus
     */
    void setFocused(bool focus);
    
    /**
     * Query widget's focus enable state.
     *@return true represent the widget could accept focus, false represent the widget couldn't accept focus
     */
    bool isFocusEnabled()const;
    
    /**
     * Allow widget to accept focus.
     *@param enable pass true/false to enable/disable the focus ability of a widget
     */
    void setFocusEnabled(bool enable);
    
    /**
     *  When a widget is in a layout, you could call this method to get the next focused widget within a specified direction. 
     *  If the widget is not in a layout, it will return itself
     *@param direction the direction to look for the next focused widget in a layout
     *@param current  the current focused widget
     *@return the next focused widget in a layout
     */
    virtual Widget* findNextFocusedWidget(FocusDirection direction, Widget* current);
    
    /**
     * when a widget calls this method, it will get focus immediately.
     */
    void requestFocus();

    /**
     * Return a current focused widget in your UI scene.
     * No matter what widget object you call this method on , it will return you the exact one focused widget.
     */
    static Widget* getCurrentFocusedWidget();

    /*
     *  Call this method with parameter true to enable the Android Dpad focus navigation feature
     *@param enable  set true to enable dpad focus navigation, otherwise disenable dpad focus navigation
     */
    static void enableDpadNavigation(bool enable);

    /**
     * When a widget lose/get focus, this method will be called. Be Caution when you provide your own version, 
     * you must call widget->setFocused(true/false) to change the focus state of the current focused widget;
     */
    std::function<void(Widget*,Widget*)> onFocusChanged;

    /**
     * use this function to manually specify the next focused widget regards to each direction
     */
    std::function<Widget*(FocusDirection)> onNextFocusedWidget;
    
    /**
     *Toggle use unify size.
     *@param enable True to use unify size, false otherwise.
     */
    void setUnifySizeEnabled(bool enable);

    /**
     * Query whether unify size enable state. 
     *@return true represent the widget use Unify Size, false represent the widget couldn't use Unify Size
     */
    bool isUnifySizeEnabled()const;

    /**
     * Set callback name.
     *@param callbackName A string representation of callback name.
     */
    void setCallbackName(const std::string& callbackName) { _callbackName = callbackName; }


    /**
     * Query callback name.
     *@return The callback name.
     */
    const std::string& getCallbackName() const{ return _callbackName; }
    
    /**
     * Set callback type.
     * @param callbackType A string representation of callback type.
     */
    void setCallbackType(const std::string& callbackType) { _callbackType = callbackType; }

    /**
     * Query callback type.
     *@return Callback type string.
     */
    const std::string& getCallbackType() const{ return _callbackType; }

    /**
     * Toggle layout component enable.
     *@param enable Layout Component of a widget
     */
    void setLayoutComponentEnabled(bool enable);

    /**
     * Query whether layout component is enabled or not. 
     *@return true represent the widget use Layout Component, false represent the widget couldn't use Layout Component.
     */
    bool isLayoutComponentEnabled()const;

CC_CONSTRUCTOR_ACCESS:
    
    friend class PageView;

    //initializes state of widget.
    virtual bool init() override;

    /*
     * @brief Sends the touch event to widget's parent, if a widget wants to handle touch event under another widget, 
     *        it must override this function.
     * @param  event  the touch event type, it could be BEGAN/MOVED/CANCELED/ENDED
     * @param parent
     * @param point
     */
    virtual void interceptTouchEvent(TouchEventType event, Widget* sender, Touch *touch);
    
    /**
     *@brief Propagate touch events to its parents
     */
    void propagateTouchEvent(TouchEventType event, Widget* sender, Touch *touch);
    
    /**
     * This method is called when a focus change event happens
     *@param widgetLostFocus  The widget which lose its focus
     *@param widgetGetFocus  The widget which get its focus
     */
    void onFocusChange(Widget* widgetLostFocus, Widget* widgetGetFocus);
    
    /**
     * Dispatch a EventFocus through a EventDispatcher
     *@param widgetLoseFocus  The widget which lose its focus
     *@param widgetGetFocus he widget which get its focus
     */
    void  dispatchFocusEvent(Widget* widgetLoseFocus, Widget* widgetGetFocus);
    
protected:
    //call back function called when size changed.
    virtual void onSizeChanged();

    //initializes renderer of widget.
    virtual void initRenderer();

    //call back function called widget's state changed to normal.
    virtual void onPressStateChangedToNormal();
    //call back function called widget's state changed to selected.
    virtual void onPressStateChangedToPressed();
    //call back function called widget's state changed to dark.
    virtual void onPressStateChangedToDisabled();

    void pushDownEvent();
    void moveEvent();

    virtual void releaseUpEvent();
    virtual void cancelUpEvent();

    
    virtual void adaptRenderers(){};
    void updateChildrenDisplayedRGBA();
    
    void copyProperties(Widget* model);
    virtual Widget* createCloneInstance();
    virtual void copySpecialProperties(Widget* model);
    virtual void copyClonedWidgetChildren(Widget* model);
    
    Widget* getWidgetParent();
    void updateContentSizeWithTextureSize(const Size& size);
    
    bool isAncestorsEnabled();
    Widget* getAncestorWidget(Node* node);
    bool isAncestorsVisible(Node* node);

    void cleanupWidget();
    LayoutComponent* getOrCreateLayoutComponent();

protected:
    bool _usingLayoutComponent;
    bool _unifySize;
    bool _enabled;
    bool _bright;
    bool _touchEnabled;
    bool _highlight;
    bool _affectByClipping;
    bool _ignoreSize;
    bool _propagateTouchEvents;

    BrightStyle _brightStyle;
    SizeType _sizeType;
    PositionType _positionType;

    //used for search widget by action tag in UIHelper class
    int _actionTag;

    Size _customSize;

    Vec2 _sizePercent;
    Vec2 _positionPercent;

    bool _hitted;
    // weak reference of the camera which made the widget passed the hit test when response touch begin event
    // it's useful in the next touch move/end events
    const Camera *_hittedByCamera;
    EventListenerTouchOneByOne* _touchListener;
    Vec2 _touchBeganPosition;
    Vec2 _touchMovePosition;
    Vec2 _touchEndPosition;

    bool _flippedX;
    bool _flippedY;

    //use map to enable switch back and forth for user layout parameters
    Map<int,LayoutParameter*> _layoutParameterDictionary;
    LayoutParameter::Type _layoutParameterType;

    bool _focused;
    bool _focusEnabled;
    /**
     * store the only one focused widget
     */
    static Widget *_focusedWidget;  //both layout & widget will be stored in this variable

    Ref*       _touchEventListener;
    ccWidgetTouchCallback _touchEventCallback;
    ccWidgetClickCallback _clickEventListener;
    ccWidgetEventCallback _ccEventCallback;
    
    std::string _callbackType;
    std::string _callbackName;
private:
    class FocusNavigationController;
    static FocusNavigationController* _focusNavigationController;
};
}

NS_CC_END
// end of ui group
/// @}

#endif /* defined(__Widget__) */