axmol/cocos/ui/UILayout.h

/****************************************************************************
Copyright (c) 2013-2014 Chukong Technologies Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
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all copies or substantial portions of the Software.

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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#ifndef __LAYOUT_H__
#define __LAYOUT_H__

#include "ui/UIWidget.h"

NS_CC_BEGIN

namespace ui {
    
class LayoutExecutant;
    
class LayoutProtocol
{
public:
    LayoutProtocol(){}
    virtual ~LayoutProtocol(){}
    
    virtual LayoutExecutant* createLayoutExecutant() = 0;
    virtual const Size getLayoutContentSize() = 0;
    virtual const Vector<Node*>& getLayoutElements() = 0;
    virtual void doLayout() = 0;
};

/**
 *  @js NA
 *  @lua NA
 */
    
class Layout : public Widget, public LayoutProtocol
{
    
    DECLARE_CLASS_GUI_INFO
    
public:
    enum class Type
    {
        ABSOLUTE,
        VERTICAL,
        HORIZONTAL,
        RELATIVE
    };
    
    enum class ClippingType
    {
        STENCIL,
        SCISSOR
    };
    
    enum class BackGroundColorType
    {
        NONE,
        SOLID,
        GRADIENT
    };
    
    /**
     * Default constructor
     */
    Layout();
    
    /**
     * Default destructor
     */
    virtual ~Layout();
    
    /**
     * Allocates and initializes a layout.
     */
    static Layout* create();
    
    //background
    /**
     * Sets a background image for layout
     *
     * @param fileName image file path.
     *
     * @param texType @see TextureResType. UI_TEX_TYPE_LOCAL means local file, UI_TEX_TYPE_PLIST means sprite frame.
     */
    void setBackGroundImage(const std::string& fileName,TextureResType texType = TextureResType::LOCAL);
    
    /**
     * Sets a background image capinsets for layout, if the background image is a scale9 render.
     *
     * @param capinsets of background image.
     *
     */
    void setBackGroundImageCapInsets(const Rect& capInsets);
    
    const Rect& getBackGroundImageCapInsets();
    
    /**
     * Sets Color Type for layout.
     *
     * @param type   @see LayoutBackGroundColorType.
     */
    void setBackGroundColorType(BackGroundColorType type);
    
    BackGroundColorType getBackGroundColorType();
    
    /**
     * Sets background iamge use scale9 renderer.
     *
     * @param enabled   true that use scale9 renderer, false otherwise.
     */
    void setBackGroundImageScale9Enabled(bool enabled);
    
    bool isBackGroundImageScale9Enabled();
    
    /**
     * Sets background color for layout, if color type is LAYOUT_COLOR_SOLID
     *
     * @param color
     */
    void setBackGroundColor(const Color3B &color);
    
    const Color3B& getBackGroundColor();
    
    /**
     * Sets background color for layout, if color type is LAYOUT_COLOR_GRADIENT
     *
     * @param start color
     *
     * @param end color
     */
    void setBackGroundColor(const Color3B &startColor, const Color3B &endColor);
    
    const Color3B& getBackGroundStartColor();
    
    const Color3B& getBackGroundEndColor();
    
    /**
     * Sets background opacity layout.
     *
     * @param opacity
     */
    void setBackGroundColorOpacity(GLubyte opacity);
    
    GLubyte getBackGroundColorOpacity();
    
    /**
     * Sets background color vector for layout, if color type is LAYOUT_COLOR_GRADIENT
     *
     * @param vector
     */
    void setBackGroundColorVector(const Vec2 &vector);
    
    const Vec2& getBackGroundColorVector();
    
    void setBackGroundImageColor(const Color3B& color);
    
    void setBackGroundImageOpacity(GLubyte opacity);
    
    const Color3B& getBackGroundImageColor();
    
    GLubyte getBackGroundImageOpacity();
    
    /**
     * Remove the background image of layout.
     */
    void removeBackGroundImage();
    
    /**
     * Gets background image texture size.
     *
     * @return background image texture size.
     */
    const Size& getBackGroundImageTextureSize() const;
    
    /**
     * Changes if layout can clip it's content and child.
     *
     * If you really need this, please enable it. But it would reduce the rendering efficiency. 
     *
     * @param clipping enabled.
     */
    virtual void setClippingEnabled(bool enabled);
    
    void setClippingType(ClippingType type);
    
    ClippingType getClippingType();
    
    /**
     * Gets if layout is clipping enabled.
     *
     * @return if layout is clipping enabled.
     */
    virtual bool isClippingEnabled();
    
    /**
     * Returns the "class name" of widget.
     */
    virtual std::string getDescription() const override;
    

    virtual void setLayoutType(Type type);
    
    virtual  Type getLayoutType() const;

    virtual void addChild(Node * child) override;
    /**
     * Adds a child to the container with a z-order
     *
     * If the child is added to a 'running' node, then 'onEnter' and 'onEnterTransitionDidFinish' will be called immediately.
     *
     * @param child     A child node
     * @param zOrder    Z order for drawing priority. Please refer to setLocalZOrder(int)
     */
    virtual void addChild(Node * child, int zOrder) override;
    /**
     * Adds a child to the container with z order and tag
     *
     * If the child is added to a 'running' node, then 'onEnter' and 'onEnterTransitionDidFinish' will be called immediately.
     *
     * @param child     A child node
     * @param zOrder    Z order for drawing priority. Please refer to setLocalZOrder(int)
     * @param tag       A interger to identify the node easily. Please refer to setTag(int)
     */
    virtual void addChild(Node* child, int zOrder, int tag) override;
    
    virtual void visit(Renderer *renderer, const Mat4 &parentTransform, bool parentTransformUpdated) override;

    virtual void removeChild(Node* child, bool cleanup = true) override;
    
    /**
     * Removes all children from the container with a cleanup.
     *
     * @see `removeAllChildrenWithCleanup(bool)`
     */
    virtual void removeAllChildren() override;
    /**
     * Removes all children from the container, and do a cleanup to all running actions depending on the cleanup parameter.
     *
     * @param cleanup   true if all running actions on all children nodes should be cleanup, false oterwise.
     * @js removeAllChildren
     * @lua removeAllChildren
     */
    virtual void removeAllChildrenWithCleanup(bool cleanup) override;

    virtual void sortAllChildren() override;
    
    void requestDoLayout();
    
    virtual void onEnter() override;
    virtual void onExit() override;
    
    /**
     * If a layout is loop focused which means that the focus movement will be inside the layout
     *@param loop  pass true to let the focus movement loop inside the layout
     */
    void setLoopFocus(bool loop);
    
    /**
     *@return If focus loop is enabled, then it will return true, otherwise it returns false. The default value is false.
     */
    bool isLoopFocus();
    
    /**
     *@param pass To specify whether the layout pass its focus to its child
     */
    void setPassFocusToChild(bool pass);
    
    /**
     * @return To query whether the layout will pass the focus to its children or not. The default value is true
     */
    bool isPassFocusToChild();
    
    /**
     *  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 dir 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) override;
    
    /**
     * To specify a user-defined functor to decide which child widget of the layout should get focused
     * @param FocusDirection the finding direction
     * @param this previous focused widget
     * @return return the index of widget in the layout
     */
    std::function<int(FocusDirection, Widget*)> onPassFocusToChild;

CC_CONSTRUCTOR_ACCESS:
    //override "init" method of widget.
    virtual bool init() override;
    
protected:
    //override "onSizeChanged" method of widget.
    virtual void onSizeChanged() override;
    
    //init background image renderer.
    void addBackGroundImage();
    
    void supplyTheLayoutParameterLackToChild(Widget* child);
    virtual Widget* createCloneInstance() override;
    virtual void copySpecialProperties(Widget* model) override;
    virtual void copyClonedWidgetChildren(Widget* model) override;
    
    void stencilClippingVisit(Renderer *renderer, const Mat4& parentTransform, bool parentTransformUpdated);
    void scissorClippingVisit(Renderer *renderer, const Mat4& parentTransform, bool parentTransformUpdated);
    
    void setStencilClippingSize(const Size& size);
    const Rect& getClippingRect();
    
    virtual void doLayout()override;
    virtual LayoutExecutant* createLayoutExecutant()override;
    virtual const Size getLayoutContentSize()override;
    virtual const Vector<Node*>& getLayoutElements() override;
    
    //clipping
    void onBeforeVisitStencil();
    void onAfterDrawStencil();
    void onAfterVisitStencil();
    
    void onBeforeVisitScissor();
    void onAfterVisitScissor();
    void updateBackGroundImageColor();
    void updateBackGroundImageOpacity();
    void updateBackGroundImageRGBA();
    
    /**
     *get the content size of the layout, it will accumulate all its children's content size
     */
    Size getLayoutAccumulatedSize() const;
    
    /**
     * When the layout get focused, it the layout pass the focus to its child, it will use this method to determine which child 
     * will get the focus.  The current algorithm to determine which child will get focus is nearest-distance-priority algorithm
     *@param dir next focused widget direction
     *@return The index of child widget in the container
     */
     int findNearestChildWidgetIndex(FocusDirection direction, Widget* baseWidget);
    
    /**
     * When the layout get focused, it the layout pass the focus to its child, it will use this method to determine which child
     * will get the focus.  The current algorithm to determine which child will get focus is farest-distance-priority algorithm
     *@param dir next focused widget direction
     *@return The index of child widget in the container
     */
    int findFarestChildWidgetIndex(FocusDirection direction, Widget* baseWidget);
    
    /**
     * caculate the nearest distance between the baseWidget and the children of the layout
     *@param the base widget which will be used to caculate the distance between the layout's children and itself
     *@return return the nearest distance between the baseWidget and the layout's children
     */
    float caculateNearestDistance(Widget* baseWidget);
    
    /**
     * caculate the farest distance between the baseWidget and the children of the layout
     *@param the base widget which will be used to caculate the distance between the layout's children and itself
     *@return return the farest distance between the baseWidget and the layout's children
     */

    float caculateFarestDistance(Widget* baseWidget);
    
    /**
     *  when a layout pass the focus to it's child, use this method to determine which algorithm to use, nearest or farest distance algorithm or not
     */
    void findProperSearchingFunctor(FocusDirection dir, Widget* baseWidget);
    
    /**
     * find the first non-layout widget in this layout
     */
    Widget *findFirstNonLayoutWidget();
    
    /**
     * find the fisrt focus enabled widget index in the layout, it will recusive searching the child widget
     */
    int findFirstFocusEnabledWidgetIndex();
    
    /**
     * find a focus enabled child Widget in the layout by index
     */
    Widget* findFocusEnabledChildWidgetByIndex(ssize_t index);
    
    /**
     * get the center point of a widget in world space
     */
    Vec2 getWorldCenterPoint(Widget* node);
    
    /**
     * this method is called internally by nextFocusedWidget. When the dir is Right/Down, then this method will be called
     *@param dir  the direction.
     *@param current  the current focused widget
     *@return the next focused widget
     */
    Widget* getNextFocusedWidget(FocusDirection direction,Widget *current);
    
    /**
     * this method is called internally by nextFocusedWidget. When the dir is Left/Up, then this method will be called
     *@param dir  the direction.
     *@param current  the current focused widget
     *@return the next focused widget
     */
    Widget* getPreviousFocusedWidget(FocusDirection direction, Widget *current);
    
    /**
     * find the nth elment in the _children array. Only the Widget descendant object will be returned
     *@param index  The index of a element in the _children array
     */
    Widget* getChildWidgetByIndex(ssize_t index);
    /**
     * whether it is the last element according to all their parents
     */
    bool  isLastWidgetInContainer(Widget* widget, FocusDirection direction);
    
    /**Lookup any parent widget with a layout type as the direction,
     * if the layout is loop focused, then return true, otherwise
     * It returns false
     */
    bool  isWidgetAncestorSupportLoopFocus(Widget* widget, FocusDirection direction);
    
    /**
     * pass the focus to the layout's next focus enabled child
     */
    Widget* passFocusToChild(FocusDirection direction, Widget* current);
    
    /**
     * If there are no focus enabled child in the layout, it will return false, otherwise it returns true
     */
    bool checkFocusEnabledChild();
    
protected:
    bool _clippingEnabled;
    
    //background
    bool _backGroundScale9Enabled;
    Node* _backGroundImage;
    std::string _backGroundImageFileName;
    Rect _backGroundImageCapInsets;
    BackGroundColorType _colorType;
    TextureResType _bgImageTexType;
    LayerColor* _colorRender;
    LayerGradient* _gradientRender;
    Color3B _cColor;
    Color3B _gStartColor;
    Color3B _gEndColor;
    Vec2 _alongVector;
    GLubyte _cOpacity;
    Size _backGroundImageTextureSize;
    Type _layoutType;
    ClippingType _clippingType;
    DrawNode* _clippingStencil;
    bool _scissorRectDirty;
    Rect _clippingRect;
    Layout* _clippingParent;
    bool _doLayoutDirty;
    bool _clippingRectDirty;
    
    //clipping

    GLboolean _currentStencilEnabled;
    GLuint _currentStencilWriteMask;
    GLenum _currentStencilFunc;
    GLint _currentStencilRef;
    GLuint _currentStencilValueMask;
    GLenum _currentStencilFail;
    GLenum _currentStencilPassDepthFail;
    GLenum _currentStencilPassDepthPass;
    GLboolean _currentDepthWriteMask;
    
    GLboolean _currentAlphaTestEnabled;
    GLenum _currentAlphaTestFunc;
    GLclampf _currentAlphaTestRef;
    
    
    Color3B _backGroundImageColor;
    GLubyte _backGroundImageOpacity;
    
    GLint _mask_layer_le;
    GroupCommand _groupCommand;
    CustomCommand _beforeVisitCmdStencil;
    CustomCommand _afterDrawStencilCmd;
    CustomCommand _afterVisitCmdStencil;
    CustomCommand _beforeVisitCmdScissor;
    CustomCommand _afterVisitCmdScissor;
    
    //whether enable loop focus or not
    bool _loopFocus;
    //on default, it will pass the focus to the next nearest widget
    bool _passFocusToChild;
     //when finding the next focused widget, use this variable to pass focus between layout & widget
    bool _isFocusPassing;
};
    
}
NS_CC_END
#endif /* defined(__Layout__) */