diff --git a/cocos/ui/UIButton.cpp b/cocos/ui/UIButton.cpp
index ea892828c3..58b0303ca4 100644
--- a/cocos/ui/UIButton.cpp
+++ b/cocos/ui/UIButton.cpp
@@ -191,7 +191,7 @@ void Button::setScale9Enabled(bool able)
     setBright(_bright);
 }
 
-bool Button::isScale9Enabled()
+bool Button::isScale9Enabled()const
 {
     return _scale9Enabled;
 }
@@ -374,7 +374,7 @@ void Button::setCapInsetsNormalRenderer(const Rect &capInsets)
     static_cast<extension::Scale9Sprite*>(_buttonNormalRenderer)->setCapInsets(capInsets);
 }
 
-const Rect& Button::getCapInsetsNormalRenderer()
+const Rect& Button::getCapInsetsNormalRenderer()const
 {
     return _capInsetsNormal;
 }
@@ -389,7 +389,7 @@ void Button::setCapInsetsPressedRenderer(const Rect &capInsets)
     static_cast<extension::Scale9Sprite*>(_buttonClickedRenderer)->setCapInsets(capInsets);
 }
 
-const Rect& Button::getCapInsetsPressedRenderer()
+const Rect& Button::getCapInsetsPressedRenderer()const
 {
     return _capInsetsPressed;
 }
@@ -404,7 +404,7 @@ void Button::setCapInsetsDisabledRenderer(const Rect &capInsets)
     static_cast<extension::Scale9Sprite*>(_buttonDisableRenderer)->setCapInsets(capInsets);
 }
 
-const Rect& Button::getCapInsetsDisabledRenderer()
+const Rect& Button::getCapInsetsDisabledRenderer()const
 {
     return _capInsetsDisabled;
 }
diff --git a/cocos/ui/UIButton.h b/cocos/ui/UIButton.h
index 3f37b4554a..18a1d5dd17 100644
--- a/cocos/ui/UIButton.h
+++ b/cocos/ui/UIButton.h
@@ -126,7 +126,7 @@ public:
      */
     void setCapInsetsNormalRenderer(const Rect &capInsets);
 
-    const Rect& getCapInsetsNormalRenderer();
+    const Rect& getCapInsetsNormalRenderer()const;
 
     /**
      * Sets capinsets for button, if button is using scale9 renderer.
@@ -135,7 +135,7 @@ public:
      */
     void setCapInsetsPressedRenderer(const Rect &capInsets);
 
-    const Rect& getCapInsetsPressedRenderer();
+    const Rect& getCapInsetsPressedRenderer()const;
 
     /**
      * Sets capinsets for button, if button is using scale9 renderer.
@@ -144,7 +144,7 @@ public:
      */
     void setCapInsetsDisabledRenderer(const Rect &capInsets);
 
-    const Rect& getCapInsetsDisabledRenderer();
+    const Rect& getCapInsetsDisabledRenderer()const;
 
     /**
      * Sets if button is using scale9 renderer.
@@ -153,7 +153,7 @@ public:
      */
     virtual void setScale9Enabled(bool able);
 
-    bool isScale9Enabled();
+    bool isScale9Enabled()const;
 
     /**
      * Changes if button can be clicked zoom effect.
diff --git a/cocos/ui/UICheckBox.cpp b/cocos/ui/UICheckBox.cpp
index 75fd2edc1c..4a5d81e873 100644
--- a/cocos/ui/UICheckBox.cpp
+++ b/cocos/ui/UICheckBox.cpp
@@ -343,7 +343,7 @@ void CheckBox::setSelectedState(bool selected)
     _frontCrossRenderer->setVisible(_isSelected);
 }
 
-bool CheckBox::getSelectedState()
+bool CheckBox::getSelectedState()const
 {
     return _isSelected;
 }
diff --git a/cocos/ui/UICheckBox.h b/cocos/ui/UICheckBox.h
index 2e35ed7798..940c3acbbb 100644
--- a/cocos/ui/UICheckBox.h
+++ b/cocos/ui/UICheckBox.h
@@ -170,7 +170,7 @@ public:
      *
      * @return selected    true that checkbox is selected, false otherwise.
      */
-    bool getSelectedState();
+    bool getSelectedState()const;
 
     //add a call back function would called when checkbox is selected or unselected.
     CC_DEPRECATED_ATTRIBUTE void addEventListenerCheckBox(Ref* target,SEL_SelectedStateEvent selector);
diff --git a/cocos/ui/UIImageView.cpp b/cocos/ui/UIImageView.cpp
index d67fe503e3..f37997e1bf 100644
--- a/cocos/ui/UIImageView.cpp
+++ b/cocos/ui/UIImageView.cpp
@@ -230,7 +230,7 @@ void ImageView::setScale9Enabled(bool able)
     setCapInsets(_capInsets);
 }
     
-bool ImageView::isScale9Enabled()
+bool ImageView::isScale9Enabled()const
 {
     return _scale9Enabled;
 }
@@ -254,7 +254,7 @@ void ImageView::setCapInsets(const Rect &capInsets)
     STATIC_CAST_SCALE9SPRITE->setCapInsets(capInsets);
 }
 
-const Rect& ImageView::getCapInsets()
+const Rect& ImageView::getCapInsets()const
 {
     return _capInsets;
 }
diff --git a/cocos/ui/UIImageView.h b/cocos/ui/UIImageView.h
index 26ce344704..867d1c1394 100644
--- a/cocos/ui/UIImageView.h
+++ b/cocos/ui/UIImageView.h
@@ -88,7 +88,7 @@ public:
      */
     void setScale9Enabled(bool able);
 
-    bool isScale9Enabled();
+    bool isScale9Enabled()const;
 
     /**
      * Sets capinsets for imageview, if imageview is using scale9 renderer.
@@ -97,7 +97,7 @@ public:
      */
     void setCapInsets(const Rect &capInsets);
 
-    const Rect& getCapInsets();
+    const Rect& getCapInsets()const;
 
     //override "ignoreContentAdaptWithSize" method of widget.
     virtual void ignoreContentAdaptWithSize(bool ignore) override;
diff --git a/cocos/ui/UILayout.cpp b/cocos/ui/UILayout.cpp
index ded60801cd..61fbf55179 100644
--- a/cocos/ui/UILayout.cpp
+++ b/cocos/ui/UILayout.cpp
@@ -178,7 +178,7 @@ void Layout::removeAllChildrenWithCleanup(bool cleanup)
     _doLayoutDirty = true;
 }
 
-bool Layout::isClippingEnabled()
+bool Layout::isClippingEnabled()const
 {
     return _clippingEnabled;
 }
@@ -445,7 +445,7 @@ void Layout::setClippingType(ClippingType type)
     setClippingEnabled(clippingEnabled);
 }
     
-Layout::ClippingType Layout::getClippingType()
+Layout::ClippingType Layout::getClippingType()const
 {
     return _clippingType;
 }
@@ -465,7 +465,7 @@ void Layout::setStencilClippingSize(const Size &size)
     }
 }
     
-const Rect& Layout::getClippingRect()
+const Rect& Layout::getClippingRect() 
 {
     if (_clippingRectDirty)
     {
@@ -582,7 +582,7 @@ void Layout::setBackGroundImageScale9Enabled(bool able)
     setBackGroundImageCapInsets(_backGroundImageCapInsets);
 }
     
-bool Layout::isBackGroundImageScale9Enabled()
+bool Layout::isBackGroundImageScale9Enabled()const
 {
     return _backGroundScale9Enabled;
 }
@@ -643,7 +643,7 @@ void Layout::setBackGroundImageCapInsets(const Rect &capInsets)
     }
 }
     
-const Rect& Layout::getBackGroundImageCapInsets()
+const Rect& Layout::getBackGroundImageCapInsets()const
 {
     return _backGroundImageCapInsets;
 }
@@ -773,7 +773,7 @@ void Layout::setBackGroundColorType(BackGroundColorType type)
     }
 }
     
-Layout::BackGroundColorType Layout::getBackGroundColorType()
+Layout::BackGroundColorType Layout::getBackGroundColorType()const
 {
     return _colorType;
 }
@@ -787,7 +787,7 @@ void Layout::setBackGroundColor(const Color3B &color)
     }
 }
     
-const Color3B& Layout::getBackGroundColor()
+const Color3B& Layout::getBackGroundColor()const
 {
     return _cColor;
 }
@@ -806,12 +806,12 @@ void Layout::setBackGroundColor(const Color3B &startColor, const Color3B &endCol
     }
 }
     
-const Color3B& Layout::getBackGroundStartColor()
+const Color3B& Layout::getBackGroundStartColor()const
 {
     return _gStartColor;
 }
 
-const Color3B& Layout::getBackGroundEndColor()
+const Color3B& Layout::getBackGroundEndColor()const
 {
     return _gEndColor;
 }
@@ -834,7 +834,7 @@ void Layout::setBackGroundColorOpacity(GLubyte opacity)
     }
 }
     
-GLubyte Layout::getBackGroundColorOpacity()
+GLubyte Layout::getBackGroundColorOpacity()const
 {
     return _cOpacity;
 }
@@ -848,7 +848,7 @@ void Layout::setBackGroundColorVector(const Vec2 &vector)
     }
 }
     
-const Vec2& Layout::getBackGroundColorVector()
+const Vec2& Layout::getBackGroundColorVector()const
 {
     return _alongVector;
 }
@@ -865,12 +865,12 @@ void Layout::setBackGroundImageOpacity(GLubyte opacity)
     updateBackGroundImageOpacity();
 }
 
-const Color3B& Layout::getBackGroundImageColor()
+const Color3B& Layout::getBackGroundImageColor()const
 {
     return _backGroundImageColor;
 }
 
-GLubyte Layout::getBackGroundImageOpacity()
+GLubyte Layout::getBackGroundImageOpacity()const
 {
     return _backGroundImageOpacity;
 }
@@ -932,12 +932,12 @@ void Layout::requestDoLayout()
     _doLayoutDirty = true;
 }
     
-const Size Layout::getLayoutContentSize()
+const Size Layout::getLayoutContentSize()const
 {
     return this->getSize();
 }
     
-const Vector<Node*>& Layout::getLayoutElements()
+const Vector<Node*>& Layout::getLayoutElements()const
 {
     return this->getChildren();
 }
@@ -1020,7 +1020,7 @@ void Layout::setLoopFocus(bool loop)
     _loopFocus = loop;
 }
 
-bool Layout::isLoopFocus()
+bool Layout::isLoopFocus()const
 {
     return _loopFocus;
 }
@@ -1031,7 +1031,7 @@ void Layout::setPassFocusToChild(bool pass)
     _passFocusToChild = pass;
 }
 
-bool Layout::isPassFocusToChild()
+bool Layout::isPassFocusToChild()const
 {
     return _passFocusToChild;
 }
@@ -1073,7 +1073,7 @@ Size Layout::getLayoutAccumulatedSize()const
     return layoutSize;
 }
 
-Vec2 Layout::getWorldCenterPoint(Widget* widget)
+Vec2 Layout::getWorldCenterPoint(Widget* widget)const
 {
     Layout *layout = dynamic_cast<Layout*>(widget);
     //FIXEDME: we don't need to calculate the content size of layout anymore
@@ -1433,7 +1433,7 @@ Widget* Layout::passFocusToChild(FocusDirection dir, cocos2d::ui::Widget *curren
         
 }
 
-bool Layout::checkFocusEnabledChild()
+bool Layout::checkFocusEnabledChild()const
 {
     bool ret = false;
     for(Node* node : _children)
@@ -1448,7 +1448,7 @@ bool Layout::checkFocusEnabledChild()
     return ret;
 }
 
-Widget* Layout::getChildWidgetByIndex(ssize_t index)
+Widget* Layout::getChildWidgetByIndex(ssize_t index)const
 {
     ssize_t size = _children.size();
     int count = 0;
@@ -1671,7 +1671,7 @@ Widget* Layout::getNextFocusedWidget(FocusDirection direction, Widget *current)
     }
 }
 
-bool  Layout::isLastWidgetInContainer(Widget* widget, FocusDirection direction)
+bool  Layout::isLastWidgetInContainer(Widget* widget, FocusDirection direction)const
 {
     Layout* parent = dynamic_cast<Layout*>(widget->getParent());
     if (parent == nullptr)
@@ -1757,7 +1757,7 @@ bool  Layout::isLastWidgetInContainer(Widget* widget, FocusDirection direction)
     return false;
 }
 
-bool  Layout::isWidgetAncestorSupportLoopFocus(Widget* widget, FocusDirection direction)
+bool  Layout::isWidgetAncestorSupportLoopFocus(Widget* widget, FocusDirection direction)const
 {
     Layout* parent = dynamic_cast<Layout*>(widget->getParent());
     if (parent == nullptr)
diff --git a/cocos/ui/UILayout.h b/cocos/ui/UILayout.h
index 94f1bf6c10..e869f4f108 100644
--- a/cocos/ui/UILayout.h
+++ b/cocos/ui/UILayout.h
@@ -40,8 +40,8 @@ public:
     virtual ~LayoutProtocol(){}
     
     virtual LayoutExecutant* createLayoutExecutant() = 0;
-    virtual const Size getLayoutContentSize() = 0;
-    virtual const Vector<Node*>& getLayoutElements() = 0;
+    virtual const Size getLayoutContentSize()const = 0;
+    virtual const Vector<Node*>& getLayoutElements()const = 0;
     virtual void doLayout() = 0;
 };
 
@@ -110,7 +110,7 @@ public:
      */
     void setBackGroundImageCapInsets(const Rect& capInsets);
     
-    const Rect& getBackGroundImageCapInsets();
+    const Rect& getBackGroundImageCapInsets()const;
     
     /**
      * Sets Color Type for layout.
@@ -119,7 +119,7 @@ public:
      */
     void setBackGroundColorType(BackGroundColorType type);
     
-    BackGroundColorType getBackGroundColorType();
+    BackGroundColorType getBackGroundColorType()const;
     
     /**
      * Sets background iamge use scale9 renderer.
@@ -128,7 +128,7 @@ public:
      */
     void setBackGroundImageScale9Enabled(bool enabled);
     
-    bool isBackGroundImageScale9Enabled();
+    bool isBackGroundImageScale9Enabled()const;
     
     /**
      * Sets background color for layout, if color type is LAYOUT_COLOR_SOLID
@@ -137,7 +137,7 @@ public:
      */
     void setBackGroundColor(const Color3B &color);
     
-    const Color3B& getBackGroundColor();
+    const Color3B& getBackGroundColor()const;
     
     /**
      * Sets background color for layout, if color type is LAYOUT_COLOR_GRADIENT
@@ -148,9 +148,9 @@ public:
      */
     void setBackGroundColor(const Color3B &startColor, const Color3B &endColor);
     
-    const Color3B& getBackGroundStartColor();
+    const Color3B& getBackGroundStartColor()const;
     
-    const Color3B& getBackGroundEndColor();
+    const Color3B& getBackGroundEndColor()const;
     
     /**
      * Sets background opacity layout.
@@ -159,7 +159,7 @@ public:
      */
     void setBackGroundColorOpacity(GLubyte opacity);
     
-    GLubyte getBackGroundColorOpacity();
+    GLubyte getBackGroundColorOpacity()const;
     
     /**
      * Sets background color vector for layout, if color type is LAYOUT_COLOR_GRADIENT
@@ -168,15 +168,15 @@ public:
      */
     void setBackGroundColorVector(const Vec2 &vector);
     
-    const Vec2& getBackGroundColorVector();
+    const Vec2& getBackGroundColorVector()const;
     
     void setBackGroundImageColor(const Color3B& color);
     
     void setBackGroundImageOpacity(GLubyte opacity);
     
-    const Color3B& getBackGroundImageColor();
+    const Color3B& getBackGroundImageColor()const;
     
-    GLubyte getBackGroundImageOpacity();
+    GLubyte getBackGroundImageOpacity()const;
     
     /**
      * Remove the background image of layout.
@@ -201,14 +201,14 @@ public:
     
     void setClippingType(ClippingType type);
     
-    ClippingType getClippingType();
+    ClippingType getClippingType()const;
     
     /**
      * Gets if layout is clipping enabled.
      *
      * @return if layout is clipping enabled.
      */
-    virtual bool isClippingEnabled();
+    virtual bool isClippingEnabled()const;
     
     /**
      * Returns the "class name" of widget.
@@ -276,7 +276,7 @@ public:
     /**
      *@return If focus loop is enabled, then it will return true, otherwise it returns false. The default value is false.
      */
-    bool isLoopFocus();
+    bool isLoopFocus()const;
     
     /**
      *@param pass To specify whether the layout pass its focus to its child
@@ -286,7 +286,7 @@ public:
     /**
      * @return To query whether the layout will pass the focus to its children or not. The default value is true
      */
-    bool isPassFocusToChild();
+    bool isPassFocusToChild()const;
     
     /**
      *  When a widget is in a layout, you could call this method to get the next focused widget within a specified direction.
@@ -329,8 +329,8 @@ protected:
     
     virtual void doLayout()override;
     virtual LayoutExecutant* createLayoutExecutant()override;
-    virtual const Size getLayoutContentSize()override;
-    virtual const Vector<Node*>& getLayoutElements() override;
+    virtual const Size getLayoutContentSize()const override;
+    virtual const Vector<Node*>& getLayoutElements()const override;
     
     //clipping
     void onBeforeVisitStencil();
@@ -402,7 +402,7 @@ protected:
     /**
      * get the center point of a widget in world space
      */
-    Vec2 getWorldCenterPoint(Widget* node);
+    Vec2 getWorldCenterPoint(Widget* node)const;
     
     /**
      * this method is called internally by nextFocusedWidget. When the dir is Right/Down, then this method will be called
@@ -424,17 +424,17 @@ protected:
      * 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);
+    Widget* getChildWidgetByIndex(ssize_t index)const;
     /**
      * whether it is the last element according to all their parents
      */
-    bool  isLastWidgetInContainer(Widget* widget, FocusDirection direction);
+    bool  isLastWidgetInContainer(Widget* widget, FocusDirection direction)const;
     
     /**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);
+    bool  isWidgetAncestorSupportLoopFocus(Widget* widget, FocusDirection direction)const;
     
     /**
      * pass the focus to the layout's next focus enabled child
@@ -444,7 +444,7 @@ protected:
     /**
      * If there are no focus enabled child in the layout, it will return false, otherwise it returns true
      */
-    bool checkFocusEnabledChild();
+    bool checkFocusEnabledChild()const;
     
 protected:
     bool _clippingEnabled;
diff --git a/cocos/ui/UILayoutParameter.h b/cocos/ui/UILayoutParameter.h
index 2760e0208b..2308799c0b 100644
--- a/cocos/ui/UILayoutParameter.h
+++ b/cocos/ui/UILayoutParameter.h
@@ -136,7 +136,7 @@ public:
     LayoutParameterProtocol(){}
     virtual ~LayoutParameterProtocol(){}
     
-    virtual LayoutParameter* getLayoutParameter() = 0;
+    virtual LayoutParameter* getLayoutParameter() const= 0;
 };
 
     
diff --git a/cocos/ui/UIListView.cpp b/cocos/ui/UIListView.cpp
index 4923c6af89..b0391bbcb1 100644
--- a/cocos/ui/UIListView.cpp
+++ b/cocos/ui/UIListView.cpp
@@ -353,7 +353,7 @@ void ListView::removeAllItems()
     removeAllChildren();
 }
 
-Widget* ListView::getItem(ssize_t index)
+Widget* ListView::getItem(ssize_t index)const
 {
     if (index < 0 || index >= _items.size())
     {
@@ -396,7 +396,7 @@ void ListView::setItemsMargin(float margin)
     _refreshViewDirty = true;
 }
     
-float ListView::getItemsMargin()
+float ListView::getItemsMargin()const
 {
     return _itemsMargin;
 }
diff --git a/cocos/ui/UIListView.h b/cocos/ui/UIListView.h
index 563f6bfaeb..d053bca7cc 100644
--- a/cocos/ui/UIListView.h
+++ b/cocos/ui/UIListView.h
@@ -130,7 +130,7 @@ public:
      *
      * @return the item widget.
      */
-    Widget* getItem(ssize_t index);
+    Widget* getItem(ssize_t index)const;
     
     /**
      * Returns the item container.
@@ -159,7 +159,7 @@ public:
      */
     void setItemsMargin(float margin);
     
-    float getItemsMargin();
+    float getItemsMargin()const;
     
     virtual void sortAllChildren() override;
     virtual void addChild(Node * child) override;
diff --git a/cocos/ui/UILoadingBar.cpp b/cocos/ui/UILoadingBar.cpp
index fd4395487b..221b266ebf 100644
--- a/cocos/ui/UILoadingBar.cpp
+++ b/cocos/ui/UILoadingBar.cpp
@@ -217,7 +217,7 @@ void LoadingBar::setScale9Enabled(bool enabled)
     setPercent(_percent);
 }
 
-bool LoadingBar::isScale9Enabled()
+bool LoadingBar::isScale9Enabled()const
 {
     return _scale9Enabled;
 }
@@ -232,7 +232,7 @@ void LoadingBar::setCapInsets(const Rect &capInsets)
     static_cast<extension::Scale9Sprite*>(_barRenderer)->setCapInsets(capInsets);
 }
 
-const Rect& LoadingBar::getCapInsets()
+const Rect& LoadingBar::getCapInsets()const
 {
     return _capInsets;
 }
diff --git a/cocos/ui/UILoadingBar.h b/cocos/ui/UILoadingBar.h
index b20c9d0c59..838d2a7af3 100644
--- a/cocos/ui/UILoadingBar.h
+++ b/cocos/ui/UILoadingBar.h
@@ -114,7 +114,7 @@ public:
      */
     void setScale9Enabled(bool enabled);
     
-    bool isScale9Enabled();
+    bool isScale9Enabled()const;
     
     /**
      * Sets capinsets for loadingbar, if loadingbar is using scale9 renderer.
@@ -123,7 +123,7 @@ public:
      */
     void setCapInsets(const Rect &capInsets);
     
-    const Rect& getCapInsets();
+    const Rect& getCapInsets()const;
     
     //override "ignoreContentAdaptWithSize" method of widget.
     virtual void ignoreContentAdaptWithSize(bool ignore) override;
diff --git a/cocos/ui/UIPageView.cpp b/cocos/ui/UIPageView.cpp
index e3e4517092..0d2f42011f 100644
--- a/cocos/ui/UIPageView.cpp
+++ b/cocos/ui/UIPageView.cpp
@@ -181,7 +181,7 @@ void PageView::removePageAtIndex(ssize_t index)
     
 void PageView::removeAllPages()
 {
-    for(auto& node : _pages)
+    for(const auto& node : _pages)
     {
         removeProtectedChild(node);
     }
@@ -200,12 +200,12 @@ void PageView::updateBoundaryPages()
     _rightBoundaryChild = _pages.at(this->getPageCount()-1);
 }
 
-ssize_t PageView::getPageCount()
+ssize_t PageView::getPageCount()const
 {
     return _pages.size();
 }
 
-float PageView::getPositionXByIndex(ssize_t idx)
+float PageView::getPositionXByIndex(ssize_t idx)const
 {
     return (getSize().width * (idx-_curPageIdx));
 }
diff --git a/cocos/ui/UIPageView.h b/cocos/ui/UIPageView.h
index af3ba46f25..bc5d11cb03 100644
--- a/cocos/ui/UIPageView.h
+++ b/cocos/ui/UIPageView.h
@@ -178,8 +178,8 @@ CC_CONSTRUCTOR_ACCESS:
 protected:
 
     Layout* createPage();
-    float getPositionXByIndex(ssize_t idx);
-    ssize_t getPageCount();
+    float getPositionXByIndex(ssize_t idx)const;
+    ssize_t getPageCount()const;
 
     void updateBoundaryPages();
     virtual bool scrollPages(float touchOffset);
diff --git a/cocos/ui/UIScrollView.cpp b/cocos/ui/UIScrollView.cpp
index 23b8ebb34c..97ac197faf 100644
--- a/cocos/ui/UIScrollView.cpp
+++ b/cocos/ui/UIScrollView.cpp
@@ -307,7 +307,7 @@ Node* ScrollView::getChildByTag(int tag) const
     return _innerContainer->getChildByTag(tag);
 }
     
-Widget* ScrollView::getChildByName(const std::string& name)
+Widget* ScrollView::getChildByName(const std::string& name)const
 {
     return _innerContainer->getChildByName(name);
 }
@@ -1709,7 +1709,7 @@ void ScrollView::setDirection(Direction dir)
     _direction = dir;
 }
 
-ScrollView::Direction ScrollView::getDirection()
+ScrollView::Direction ScrollView::getDirection()const
 {
     return _direction;
 }
@@ -1734,7 +1734,7 @@ bool ScrollView::isInertiaScrollEnabled() const
     return _inertiaScrollEnabled;
 }
 
-Layout* ScrollView::getInnerContainer()
+Layout* ScrollView::getInnerContainer()const
 {
     return _innerContainer;
 }
diff --git a/cocos/ui/UIScrollView.h b/cocos/ui/UIScrollView.h
index c2daeb3de1..ff159a27da 100644
--- a/cocos/ui/UIScrollView.h
+++ b/cocos/ui/UIScrollView.h
@@ -118,7 +118,7 @@ public:
      *
      * @return SCROLLVIEW_DIR
      */
-    Direction getDirection();
+    Direction getDirection()const;
     
     /**
      * Gets inner container of scrollview.
@@ -127,7 +127,7 @@ public:
      *
      * @return inner container.
      */
-    Layout* getInnerContainer();
+    Layout* getInnerContainer()const;
     
     /**
      * Scroll inner container to bottom boundary of scrollview.
@@ -274,7 +274,7 @@ public:
     virtual const Vector<Node*>& getChildren() const override;
     virtual ssize_t getChildrenCount() const override;
     virtual Node * getChildByTag(int tag) const override;
-    virtual Widget* getChildByName(const std::string& name) override;
+    virtual Widget* getChildByName(const std::string& name)const override;
     
     //handle touch event
     virtual bool onTouchBegan(Touch *touch, Event *unusedEvent) override;
diff --git a/cocos/ui/UISlider.cpp b/cocos/ui/UISlider.cpp
index 4b6e89f4e3..561c39e891 100644
--- a/cocos/ui/UISlider.cpp
+++ b/cocos/ui/UISlider.cpp
@@ -231,7 +231,7 @@ void Slider::setScale9Enabled(bool able)
     setCapInsetProgressBarRebderer(_capInsetsProgressBarRenderer);
 }
     
-bool Slider::isScale9Enabled()
+bool Slider::isScale9Enabled()const
 {
     return _scale9Enabled;
 }
@@ -261,7 +261,7 @@ void Slider::setCapInsetsBarRenderer(const Rect &capInsets)
     static_cast<extension::Scale9Sprite*>(_barRenderer)->setCapInsets(capInsets);
 }
     
-const Rect& Slider::getCapInsetsBarRenderer()
+const Rect& Slider::getCapInsetsBarRenderer()const
 {
     return _capInsetsBarRenderer;
 }
@@ -276,7 +276,7 @@ void Slider::setCapInsetProgressBarRebderer(const Rect &capInsets)
     static_cast<extension::Scale9Sprite*>(_progressBarRenderer)->setCapInsets(capInsets);
 }
     
-const Rect& Slider::getCapInsetsProgressBarRebderer()
+const Rect& Slider::getCapInsetsProgressBarRebderer()const
 {
     return _capInsetsProgressBarRenderer;
 }
@@ -422,7 +422,7 @@ void Slider::onTouchCancelled(Touch *touch, Event *unusedEvent)
     Widget::onTouchCancelled(touch, unusedEvent);
 }
 
-float Slider::getPercentWithBallPos(float px)
+float Slider::getPercentWithBallPos(float px)const
 {
     return ((px/_barLength)*100.0f);
 }
@@ -449,7 +449,7 @@ void Slider::percentChangedEvent()
     }
 }
 
-int Slider::getPercent()
+int Slider::getPercent()const
 {
     return _percent;
 }
diff --git a/cocos/ui/UISlider.h b/cocos/ui/UISlider.h
index fc2e9af290..76bb7463c4 100644
--- a/cocos/ui/UISlider.h
+++ b/cocos/ui/UISlider.h
@@ -85,7 +85,7 @@ public:
      */
     void setScale9Enabled(bool able);
     
-    bool isScale9Enabled();
+    bool isScale9Enabled()const;
     
     /**
      * Sets capinsets for slider, if slider is using scale9 renderer.
@@ -101,7 +101,7 @@ public:
      */
     void setCapInsetsBarRenderer(const Rect &capInsets);
     
-    const Rect& getCapInsetsBarRenderer();
+    const Rect& getCapInsetsBarRenderer()const;
     
     /**
      * Sets capinsets for slider, if slider is using scale9 renderer.
@@ -110,7 +110,7 @@ public:
      */
     void setCapInsetProgressBarRebderer(const Rect &capInsets);
     
-    const Rect& getCapInsetsProgressBarRebderer();
+    const Rect& getCapInsetsProgressBarRebderer()const;
     
     /**
      * Load textures for slider ball.
@@ -176,7 +176,7 @@ public:
      *
      * @return percent    percent value from 1 to 100.
      */
-    int getPercent();
+    int getPercent()const;
     
     /**
      * Add call back function called when slider's percent has changed to slider.
@@ -210,7 +210,7 @@ CC_CONSTRUCTOR_ACCESS:
 
 protected:
     virtual void initRenderer() override;
-    float getPercentWithBallPos(float location);
+    float getPercentWithBallPos(float location)const;
     void percentChangedEvent();
     virtual void onPressStateChangedToNormal() override;
     virtual void onPressStateChangedToPressed() override;
diff --git a/cocos/ui/UIText.cpp b/cocos/ui/UIText.cpp
index 88b0aafa36..5d4efd57df 100644
--- a/cocos/ui/UIText.cpp
+++ b/cocos/ui/UIText.cpp
@@ -136,7 +136,7 @@ void Text::setFontSize(int size)
     _labelRendererAdaptDirty = true;
 }
     
-int Text::getFontSize()
+int Text::getFontSize()const
 {
     return _fontSize;
 }
@@ -160,7 +160,7 @@ void Text::setFontName(const std::string& name)
     _labelRendererAdaptDirty = true;
 }
     
-const std::string& Text::getFontName()
+const std::string& Text::getFontName()const
 {
     return _fontName;
 }
@@ -177,7 +177,7 @@ void Text::setTextAreaSize(const Size &size)
     _labelRendererAdaptDirty = true;
 }
     
-const Size& Text::getTextAreaSize()
+const Size& Text::getTextAreaSize()const
 {
     return _labelRenderer->getDimensions();
 }
@@ -189,7 +189,7 @@ void Text::setTextHorizontalAlignment(TextHAlignment alignment)
     _labelRendererAdaptDirty = true;
 }
     
-TextHAlignment Text::getTextHorizontalAlignment()
+TextHAlignment Text::getTextHorizontalAlignment()const
 {
     return _labelRenderer->getHorizontalAlignment();
 }
@@ -201,7 +201,7 @@ void Text::setTextVerticalAlignment(TextVAlignment alignment)
     _labelRendererAdaptDirty = true;
 }
     
-TextVAlignment Text::getTextVerticalAlignment()
+TextVAlignment Text::getTextVerticalAlignment()const
 {
     return _labelRenderer->getVerticalAlignment();
 }
@@ -211,7 +211,7 @@ void Text::setTouchScaleChangeEnabled(bool enable)
     _touchScaleChangeEnabled = enable;
 }
     
-bool Text::isTouchScaleChangeEnabled()
+bool Text::isTouchScaleChangeEnabled()const
 {
     return _touchScaleChangeEnabled;
 }
diff --git a/cocos/ui/UIText.h b/cocos/ui/UIText.h
index d0bc342a08..b3cc3bd6b0 100644
--- a/cocos/ui/UIText.h
+++ b/cocos/ui/UIText.h
@@ -104,7 +104,7 @@ public:
      */
     void setFontSize(int size);
 
-    int getFontSize();
+    int getFontSize()const;
 
     /**
      * Sets the font name of label.
@@ -117,7 +117,7 @@ public:
      */
     void setFontName(const std::string& name);
 
-    const std::string& getFontName();
+    const std::string& getFontName()const;
     
     Type getType() const;
 
@@ -133,7 +133,7 @@ public:
      *
      * @return  touch scale enabled of label.
      */
-    bool isTouchScaleChangeEnabled();
+    bool isTouchScaleChangeEnabled()const;
 
     //override "getVirtualRendererSize" method of widget.
     virtual const Size& getVirtualRendererSize() const override;
@@ -148,15 +148,15 @@ public:
 
     void setTextAreaSize(const Size &size);
 
-    const Size& getTextAreaSize();
+    const Size& getTextAreaSize()const;
 
     void setTextHorizontalAlignment(TextHAlignment alignment);
 
-    TextHAlignment getTextHorizontalAlignment();
+    TextHAlignment getTextHorizontalAlignment()const;
 
     void setTextVerticalAlignment(TextVAlignment alignment);
 
-    TextVAlignment getTextVerticalAlignment();
+    TextVAlignment getTextVerticalAlignment()const;
     
 CC_CONSTRUCTOR_ACCESS:
     virtual bool init() override;
diff --git a/cocos/ui/UITextField.cpp b/cocos/ui/UITextField.cpp
index 688ab9a80f..49bc100eb3 100644
--- a/cocos/ui/UITextField.cpp
+++ b/cocos/ui/UITextField.cpp
@@ -246,7 +246,7 @@ void UICCTextField::setMaxLengthEnabled(bool enable)
     _maxLengthEnabled = enable;
 }
 
-bool UICCTextField::isMaxLengthEnabled()
+bool UICCTextField::isMaxLengthEnabled()const
 {
     return _maxLengthEnabled;
 }
@@ -256,12 +256,12 @@ void UICCTextField::setMaxLength(int length)
     _maxLength = length;
 }
 
-int UICCTextField::getMaxLength()
+int UICCTextField::getMaxLength()const
 {
     return _maxLength;
 }
 
-int UICCTextField::getCharCount()
+int UICCTextField::getCharCount()const
 {
     return TextFieldTTF::getCharCount();
 }
@@ -271,7 +271,7 @@ void UICCTextField::setPasswordEnabled(bool enable)
     _passwordEnabled = enable;
 }
 
-bool UICCTextField::isPasswordEnabled()
+bool UICCTextField::isPasswordEnabled()const
 {
     return _passwordEnabled;
 }
@@ -317,7 +317,7 @@ void UICCTextField::setAttachWithIME(bool attach)
     _attachWithIME = attach;
 }
 
-bool UICCTextField::getAttachWithIME()
+bool UICCTextField::getAttachWithIME()const
 {
     return _attachWithIME;
 }
@@ -327,7 +327,7 @@ void UICCTextField::setDetachWithIME(bool detach)
     _detachWithIME = detach;
 }
 
-bool UICCTextField::getDetachWithIME()
+bool UICCTextField::getDetachWithIME()const
 {
     return _detachWithIME;
 }
@@ -337,7 +337,7 @@ void UICCTextField::setInsertText(bool insert)
     _insertText = insert;
 }
 
-bool UICCTextField::getInsertText()
+bool UICCTextField::getInsertText()const
 {
     return _insertText;
 }
@@ -347,7 +347,7 @@ void UICCTextField::setDeleteBackward(bool deleteBackward)
     _deleteBackward = deleteBackward;
 }
 
-bool UICCTextField::getDeleteBackward()
+bool UICCTextField::getDeleteBackward()const
 {
     return _deleteBackward;
 }
@@ -455,7 +455,7 @@ bool TextField::hitTest(const Vec2 &pt)
     return false;
 }
     
-Size TextField::getTouchSize()
+Size TextField::getTouchSize()const
 {
     return Size(_touchWidth, _touchHeight);
 }
@@ -526,7 +526,7 @@ void TextField::setPlaceHolder(const std::string& value)
     updateContentSizeWithTextureSize(_textFieldRenderer->getContentSize());
 }
     
-const std::string& TextField::getPlaceHolder()
+const std::string& TextField::getPlaceHolder()const
 {
     return _textFieldRenderer->getPlaceHolder();
 }
@@ -538,7 +538,7 @@ void TextField::setFontSize(int size)
     updateContentSizeWithTextureSize(_textFieldRenderer->getContentSize());
 }
     
-int TextField::getFontSize()
+int TextField::getFontSize()const
 {
     return _textFieldRenderer->getSystemFontSize();
 }
@@ -550,7 +550,7 @@ void TextField::setFontName(const std::string& name)
     updateContentSizeWithTextureSize(_textFieldRenderer->getContentSize());
 }
     
-const std::string& TextField::getFontName()
+const std::string& TextField::getFontName()const
 {
     return _textFieldRenderer->getSystemFontName();
 }
@@ -560,7 +560,7 @@ void TextField::didNotSelectSelf()
     _textFieldRenderer->detachWithIME();
 }
 
-const std::string& TextField::getStringValue()
+const std::string& TextField::getStringValue()const
 {
     return _textFieldRenderer->getString();
 }
@@ -580,7 +580,7 @@ void TextField::setMaxLengthEnabled(bool enable)
     _textFieldRenderer->setMaxLengthEnabled(enable);
 }
 
-bool TextField::isMaxLengthEnabled()
+bool TextField::isMaxLengthEnabled()const
 {
     return _textFieldRenderer->isMaxLengthEnabled();
 }
@@ -592,7 +592,7 @@ void TextField::setMaxLength(int length)
     setText(getStringValue());
 }
 
-int TextField::getMaxLength()
+int TextField::getMaxLength()const
 {
     return _textFieldRenderer->getMaxLength();
 }
@@ -602,7 +602,7 @@ void TextField::setPasswordEnabled(bool enable)
     _textFieldRenderer->setPasswordEnabled(enable);
 }
 
-bool TextField::isPasswordEnabled()
+bool TextField::isPasswordEnabled()const
 {
     return _textFieldRenderer->isPasswordEnabled();
 }
@@ -616,7 +616,7 @@ void TextField::setPasswordStyleText(const char *styleText)
     setText(getStringValue());
 }
     
-const char* TextField::getPasswordStyleText()
+const char* TextField::getPasswordStyleText()const
 {
     return _passwordStyleText.c_str();
 }
@@ -651,7 +651,7 @@ void TextField::update(float dt)
     }
 }
 
-bool TextField::getAttachWithIME()
+bool TextField::getAttachWithIME()const
 {
     return _textFieldRenderer->getAttachWithIME();
 }
@@ -661,7 +661,7 @@ void TextField::setAttachWithIME(bool attach)
     _textFieldRenderer->setAttachWithIME(attach);
 }
 
-bool TextField::getDetachWithIME()
+bool TextField::getDetachWithIME()const
 {
     return _textFieldRenderer->getDetachWithIME();
 }
@@ -671,7 +671,7 @@ void TextField::setDetachWithIME(bool detach)
     _textFieldRenderer->setDetachWithIME(detach);
 }
 
-bool TextField::getInsertText()
+bool TextField::getInsertText()const
 {
     return _textFieldRenderer->getInsertText();
 }
@@ -681,7 +681,7 @@ void TextField::setInsertText(bool insertText)
     _textFieldRenderer->setInsertText(insertText);
 }
 
-bool TextField::getDeleteBackward()
+bool TextField::getDeleteBackward()const
 {
     return _textFieldRenderer->getDeleteBackward();
 }
diff --git a/cocos/ui/UITextField.h b/cocos/ui/UITextField.h
index 95cc9ca650..8c2ef01c9e 100644
--- a/cocos/ui/UITextField.h
+++ b/cocos/ui/UITextField.h
@@ -59,22 +59,26 @@ public:
     void closeIME();
     
     void setMaxLengthEnabled(bool enable);
-    bool isMaxLengthEnabled();
+    bool isMaxLengthEnabled()const;
     void setMaxLength(int length);
-    int getMaxLength();
-    int getCharCount();
+    int getMaxLength()const;
+    int getCharCount()const;
+    
     void setPasswordEnabled(bool enable);
-    bool isPasswordEnabled();
+    bool isPasswordEnabled()const;
     void setPasswordStyleText(const std::string& styleText);
     void setPasswordText(const std::string& text);
+    
     void setAttachWithIME(bool attach);
-    bool getAttachWithIME();
+    bool getAttachWithIME()const;
     void setDetachWithIME(bool detach);
-    bool getDetachWithIME();
+    bool getDetachWithIME()const;
+    
     void setInsertText(bool insert);
-    bool getInsertText();
+    bool getInsertText()const;
+    
     void setDeleteBackward(bool deleteBackward);
-    bool getDeleteBackward();
+    bool getDeleteBackward()const;
 protected:
     bool _maxLengthEnabled;
     int _maxLength;
@@ -123,36 +127,48 @@ public:
                              const std::string& fontName,
                              int fontSize);
     void setTouchSize(const Size &size);
-    Size getTouchSize();
+    Size getTouchSize()const;
     void setTouchAreaEnabled(bool enable);
     virtual bool hitTest(const Vec2 &pt);
-    void setText(const std::string& text);
+    
     void setPlaceHolder(const std::string& value);
-    const std::string& getPlaceHolder();
+    const std::string& getPlaceHolder()const;
+    
     void setFontSize(int size);
-    int getFontSize();
+    int getFontSize()const;
     void setFontName(const std::string& name);
-    const std::string& getFontName();
+    const std::string& getFontName()const;
+    
     virtual void didNotSelectSelf();
-    const std::string& getStringValue();
+    
+    void setText(const std::string& text);
+    const std::string& getStringValue()const;
+    
     virtual bool onTouchBegan(Touch *touch, Event *unusedEvent) override;
+    
     void setMaxLengthEnabled(bool enable);
-    bool isMaxLengthEnabled();
+    bool isMaxLengthEnabled()const;
     void setMaxLength(int length);
-    int getMaxLength();
+    int getMaxLength()const;
+    
     void setPasswordEnabled(bool enable);
-    bool isPasswordEnabled();
+    bool isPasswordEnabled()const;
     void setPasswordStyleText(const char* styleText);
-    const char* getPasswordStyleText();
+    const char* getPasswordStyleText()const;
+    
     virtual void update(float dt) override;
-    bool getAttachWithIME();
+    
+    bool getAttachWithIME()const;
     void setAttachWithIME(bool attach);
-    bool getDetachWithIME();
+    bool getDetachWithIME()const;
     void setDetachWithIME(bool detach);
-    bool getInsertText();
+    
+    bool getInsertText()const;
     void setInsertText(bool insertText);
-    bool getDeleteBackward();
+    
+    bool getDeleteBackward()const;
     void setDeleteBackward(bool deleteBackward);
+    
     CC_DEPRECATED_ATTRIBUTE void addEventListenerTextField(Ref* target, SEL_TextFieldEvent selecor);
     void addEventListener(const ccTextFieldCallback& callback);
     
@@ -184,6 +200,7 @@ protected:
     virtual void updateTextureOpacity() override;
     virtual void updateTextureRGBA() override;
     void textfieldRendererScaleChangedWithSize();
+    
     virtual Widget* createCloneInstance() override;
     virtual void copySpecialProperties(Widget* model) override;
     virtual void adaptRenderers() override;
diff --git a/cocos/ui/UIVideoPlayer.h b/cocos/ui/UIVideoPlayer.h
index c6dd4b3b79..fa3627b61c 100644
--- a/cocos/ui/UIVideoPlayer.h
+++ b/cocos/ui/UIVideoPlayer.h
@@ -66,10 +66,10 @@ namespace experimental{
             virtual void setVisible(bool visible) override;
 
             virtual void setKeepAspectRatioEnabled(bool enable);
-            virtual bool isKeepAspectRatioEnabled() { return _keepAspectRatioEnabled;}
+            virtual bool isKeepAspectRatioEnabled()const { return _keepAspectRatioEnabled;}
 
             virtual void setFullScreenEnabled(bool enabled);
-            virtual bool isFullScreenEnabled();
+            virtual bool isFullScreenEnabled()const;
 
             virtual void addEventListener(const VideoPlayer::ccVideoPlayerCallback& callback);
 
diff --git a/cocos/ui/UIVideoPlayerAndroid.cpp b/cocos/ui/UIVideoPlayerAndroid.cpp
index ae0b7d50d7..2c8073c68c 100644
--- a/cocos/ui/UIVideoPlayerAndroid.cpp
+++ b/cocos/ui/UIVideoPlayerAndroid.cpp
@@ -242,7 +242,7 @@ void VideoPlayer::setFullScreenEnabled(bool enabled)
     }
 }
 
-bool VideoPlayer::isFullScreenEnabled()
+bool VideoPlayer::isFullScreenEnabled()const
 {
     return _fullScreenEnabled;
 }
diff --git a/cocos/ui/UIVideoPlayerIOS.mm b/cocos/ui/UIVideoPlayerIOS.mm
index 52ee49cb99..a38db66291 100644
--- a/cocos/ui/UIVideoPlayerIOS.mm
+++ b/cocos/ui/UIVideoPlayerIOS.mm
@@ -343,7 +343,7 @@ void VideoPlayer::draw(Renderer* renderer, const Mat4 &transform, bool transform
 #endif
 }
 
-bool VideoPlayer::isFullScreenEnabled()
+bool VideoPlayer::isFullScreenEnabled()const
 {
     return [((UIVideoViewWrapperIos*)_videoView) isFullScreenEnabled];
 }
diff --git a/cocos/ui/UIWidget.cpp b/cocos/ui/UIWidget.cpp
index b1258e77a7..38c3b61770 100644
--- a/cocos/ui/UIWidget.cpp
+++ b/cocos/ui/UIWidget.cpp
@@ -244,7 +244,7 @@ void Widget::setEnabled(bool enabled)
     _enabled = enabled;
 }
 
-Widget* Widget::getChildByName(const std::string& name)
+Widget* Widget::getChildByName(const std::string& name)const
 {
     for (auto& child : _children)
     {
@@ -468,7 +468,7 @@ const Vec2& Widget::getSizePercent() const
     return _sizePercent;
 }
 
-Vec2 Widget::getWorldPosition()
+Vec2 Widget::getWorldPosition()const
 {
     return convertToWorldSpace(Vec2(_anchorPoint.x * _contentSize.width, _anchorPoint.y * _contentSize.height));
 }
@@ -899,8 +899,7 @@ void Widget::setPositionPercent(const Vec2 &percent)
     }
 }
 
-const Vec2& Widget::getPositionPercent()
-{
+const Vec2& Widget::getPositionPercent()const{
     return _positionPercent;
 }
 
@@ -944,17 +943,17 @@ float Widget::getTopBoundary() const
     return getBottomBoundary() + _size.height;
 }
 
-const Vec2& Widget::getTouchStartPos()
+const Vec2& Widget::getTouchStartPos()const
 {
     return _touchStartPos;
 }
 
-const Vec2& Widget::getTouchMovePos()
+const Vec2& Widget::getTouchMovePos()const
 {
     return _touchMovePos;
 }
 
-const Vec2& Widget::getTouchEndPos()
+const Vec2& Widget::getTouchEndPos()const
 {
     return _touchEndPos;
 }
@@ -980,7 +979,7 @@ void Widget::setLayoutParameter(LayoutParameter *parameter)
     _layoutParameterType = parameter->getLayoutType();
 }
 
-LayoutParameter* Widget::getLayoutParameter()
+LayoutParameter* Widget::getLayoutParameter()const
 {
     return dynamic_cast<LayoutParameter*>(_layoutParameterDictionary.at((int)_layoutParameterType));
 }
@@ -1118,7 +1117,7 @@ void Widget::setActionTag(int tag)
 	_actionTag = tag;
 }
 
-int Widget::getActionTag()
+int Widget::getActionTag()const
 {
 	return _actionTag;
 }
@@ -1137,7 +1136,7 @@ void Widget::setFocused(bool focus)
     
 }
 
-bool Widget::isFocused()
+bool Widget::isFocused()const
 {
     return _focused;
 }
@@ -1147,7 +1146,7 @@ void Widget::setFocusEnabled(bool enable)
     _focusEnabled = enable;
 }
 
-bool Widget::isFocusEnabled()
+bool Widget::isFocusEnabled()const
 {
     return _focusEnabled;
 }
@@ -1240,7 +1239,7 @@ void Widget::onFocusChange(Widget* widgetLostFocus, Widget* widgetGetFocus)
     }
 }
 
-Widget* Widget::getCurrentFocusedWidget()
+Widget* Widget::getCurrentFocusedWidget()const
 {
     return _focusedWidget;
 }
diff --git a/cocos/ui/UIWidget.h b/cocos/ui/UIWidget.h
index b730f12bd5..780b34ea1d 100644
--- a/cocos/ui/UIWidget.h
+++ b/cocos/ui/UIWidget.h
@@ -235,7 +235,7 @@ public:
      *
      * @return a Widget object whose name equals to the input parameter
      */
-    virtual Widget* getChildByName(const std::string& name);
+    virtual Widget* getChildByName(const std::string& name) const;
 
     virtual void visit(cocos2d::Renderer *renderer, const Mat4 &parentTransform, bool parentTransformUpdated) override;
 
@@ -274,7 +274,7 @@ public:
      *
      * @return The percent (x,y) of the widget in OpenGL coordinates
      */
-    const Vec2& getPositionPercent();
+    const Vec2& getPositionPercent()const;
 
     /**
      * Changes the position type of the widget
@@ -311,7 +311,7 @@ public:
      *
      * @return true if the widget is flipped horizaontally, false otherwise.
      */
-    virtual bool isFlippedX(){return _flippedX;};
+    virtual bool isFlippedX()const{return _flippedX;};
 
     /**
      * Sets whether the widget should be flipped vertically or not.
@@ -330,7 +330,7 @@ public:
      *
      * @return true if the widget is flipped vertically, flase otherwise.
      */
-    virtual bool isFlippedY(){return _flippedY;};
+    virtual bool isFlippedY()const{return _flippedY;};
     
     virtual void setColor(const Color3B& color) override;
     
@@ -363,21 +363,21 @@ public:
      *
      * @return the touch began point.
      */
-    const Vec2& getTouchStartPos();
+    const Vec2& getTouchStartPos()const;
 
     /*
      * Gets the touch move point of widget when widget is selected.
      *
      * @return the touch move point.
      */
-    const Vec2& getTouchMovePos();
+    const Vec2& getTouchMovePos()const;
 
     /*
      * Gets the touch end point of widget when widget is selected.
      *
      * @return the touch end point.
      */
-    const Vec2& getTouchEndPos();
+    const Vec2& getTouchEndPos()const;
 
     /**
      * Changes the name that is used to identify the widget easily.
@@ -487,7 +487,7 @@ public:
      *
      * @return LayoutParameter
      */
-    LayoutParameter* getLayoutParameter() override;
+    LayoutParameter* getLayoutParameter()const override;
     CC_DEPRECATED_ATTRIBUTE LayoutParameter* getLayoutParameter(LayoutParameter::Type type);
 
 
@@ -510,7 +510,7 @@ public:
      *
      * @return world position of widget.
      */
-    Vec2 getWorldPosition();
+    Vec2 getWorldPosition()const;
 
     /**
      * Gets the Virtual Renderer of widget.
@@ -547,12 +547,12 @@ public:
     
     /*temp action*/
     void setActionTag(int tag);
-	int getActionTag();
+	int getActionTag()const;
     
     /**
      *@return  whether the widget is focused or not
      */
-    bool isFocused();
+    bool isFocused()const;
     
     /**
      *@param focus  pass true to let the widget get focus or pass false to let the widget lose focus
@@ -563,7 +563,7 @@ public:
     /**
      *@return true represent the widget could accept focus, false represent the widget couldn't accept focus
      */
-    bool isFocusEnabled();
+    bool isFocusEnabled()const;
     
     /**
      *@param enable pass true/false to enable/disable the focus ability of a widget
@@ -595,7 +595,7 @@ public:
         return getCurrentFocusedWidget();
     }
 
-    Widget* getCurrentFocusedWidget();
+    Widget* getCurrentFocusedWidget()const;
     static void enableDpadNavigation(bool enable);
 
     std::function<void(Widget*,Widget*)> onFocusChanged;