[Cocos2dx] Enable UIButton to support disable status

Add a UIButton component in cocostudio. We can see that the following three buttons are usually used: normal, pressed, and disable. however, after we set the disable status, after running the button-> setEnable (false) on a button in our game project, the button is completely lost ?! Solution: Modify the Widget: visit () method and change it to: void Widget: visit () {CCNodeRGBA: visit () ;}, that is, delete the if judgment. modify the Widget: setEnable () method to void Widget: setEnabled (bool enabled) {_ enabled = enabled; if (_ widgetChildren & _ widgetChildren-> count ()> 0) {CCObject * child; CCARRAY_FOREACH (_ widgetChildren, child) {(Widget *) child)-> setEnabled (enabled) ;}} setBright (enabled ); // Add this line}, that is, add setBright (enabled); line. if you want to know why It is an explanation. explain the implementation of the strange rendering Widget: visit (): void Widget: visit () {if (_ enabled) {CCNodeRGBA: visit ();}} if you have no time to carefully read the cocos2dx source code, here is a simple explanation: the visit () method was originally inherited from CCNode. that is to say, any Display object has this method. CCNode: visit () is the rendering function of CCNode. It is the most important function in view rendering. It is similar to the UIView: draw () function in IOS development. the Framework calls this method at each frame, and this method is used to draw the openGL of the current component. let's take a look at the implementation of CCNode: visit () for verification: void CCNode: visit (){... this-> draw ();...} // forget it. This code is a bit long. Some people may not be interested in it for a long time. I put it in the *** appendix. (* ^__ ^ *) when you see this, you must have discovered the problem: Why is rendering only when _ enabled is true? Isn't it a pitfall? Will disable status be ignored? Maybe cocos2dx has another plan. I don't understand it clearly. But since this function does not meet my requirements, I will remove the if. (who makes us a programmer ?). However, the problem is not completely over. Or is the enable of the disable status. Widget not displayed? The UIButton: setEnable () method is relatively short. paste it and see it. void Widget: setEnabled (bool enabled) {_ enabled = enabled; if (_ widgetChildren & _ widgetChildren-> count ()> 0) {CCObject * child; CCARRAY_FOREACH (_ widgetChildren, child) {(Widget *) child)-> setEnabled (enabled );}}} it is found that this Code does nothing except setting the _ enable and all children's _ enable status to false. by viewing the widget code, it is easy to see that the three-state widget is implemented through the following three functions: void Widget: onPressStateChangedToNormal () {} void Widget:: OnPressStateChangedToPressed () {} void Widget: onPressStateChangedToDisabled () {} Yes, they are all empty functions. sub-classes implement these three functions as needed. the following is the implementation of setBright: void Widget: setBright (bool bright) {_ bright = bright; if (_ bright) {_ brightStyle = BRIGHT_NONE; setBrightStyle (BRIGHT_NORMAL );} else {onPressStateChangedToDisabled () ;}} can be seen from the code above. we call setBright (false) to render different images based on the current status of the widget. appendix code snippet 1 CCNode: visit () void CCNode: visit (){/ /Quick return if not visible. children won't be drawn. if (! M_bVisible) {return;} kmGLPushMatrix (); if (m_pGrid & m_pGrid-> isActive () {m_pGrid-> beforeDraw ();} this-> transform (); CCNode * pNode = NULL; unsigned int I = 0; if (m_pChildren & m_pChildren-> count ()> 0) {sortAllChildren (); // draw children zOrder <0 ccArray * arrayData = m_pChildren-> data; for (; I <arrayData-> num; I ++) {pNode = (CCNode *) arrayData-> arr [I]; if (pNode & pNode-> m_nZOrder <0) {pNode-> visit ();} else {break ;}} // self draw this-> draw (); for (; I <arrayData-> num; I ++) {pNode = (CCNode *) arrayData-> arr [I]; if (pNode) {pNode-> visit () ;}} else {this-> draw () ;}// reset for next frame m_uOrderOfArrival = 0; if (m_pGrid & m_pGrid-> isActive () {m_pGrid-> afterDraw (this) ;} kmGLPopMatrix ();}