Ability to get low coupling inheritance (cocos2d#19276)

It is necessary for flexible inheritance from the base class.

Author: gestern

cocos/ui/UIAbstractCheckButton.h

@@ -115,7 +115,7 @@ class CC_GUI_DLL AbstractCheckButton : public Widget
  * Set to true will cause the CheckBox's state to "selected", false otherwise.
  *@param selected Set to true will change CheckBox to selected state, false otherwise.
  */
- void setSelected(bool selected);
+ virtual void setSelected(bool selected);
 
  //override functions
  virtual Size getVirtualRendererSize() const override;
@@ -196,22 +196,22 @@ class CC_GUI_DLL AbstractCheckButton : public Widget
  virtual void onPressStateChangedToPressed() override;
  virtual void onPressStateChangedToDisabled() override;
 
- void setupBackgroundTexture();
+ virtual void setupBackgroundTexture();
  void loadTextureBackGround(SpriteFrame* spriteFrame);
- void setupBackgroundSelectedTexture();
+ virtual void setupBackgroundSelectedTexture();
  void loadTextureBackGroundSelected(SpriteFrame* spriteFrame);
- void setupFrontCrossTexture();
+ virtual void setupFrontCrossTexture();
  void loadTextureFrontCross(SpriteFrame* spriteframe);
- void setupBackgroundDisable();
+ virtual void setupBackgroundDisable();
  void loadTextureBackGroundDisabled(SpriteFrame* spriteframe);
- void setupFrontCrossDisableTexture();
+ virtual void setupFrontCrossDisableTexture();
  void loadTextureFrontCrossDisabled(SpriteFrame* spriteframe);
 
  virtual void dispatchSelectChangedEvent(bool selected) = 0;
 
  virtual void onSizeChanged() override;
 
- void backGroundTextureScaleChangedWithSize();
+ virtual void backGroundTextureScaleChangedWithSize();
  void backGroundSelectedTextureScaleChangedWithSize();
  void frontCrossTextureScaleChangedWithSize();
  void backGroundDisabledTextureScaleChangedWithSize();