Qt animation - member doesn't exist

This code:

 QStateMachine *machine = new QStateMachine;

     QState *state1 = new QState(machine->rootState());

I'm 开发者_JAVA百科getting an error:

C:\Users..\Animated_Button\main.cpp:13: error: 'class QStateMachine' has no member named 'rootState'

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Indeed, according to the documentation, QStateMachine has no method named rootState. According to this, it was removed at one point. The article states this:

QStateMachine::rootState() is gone; the state machine now is the root state.

So the code you have comes from an outdated source. You should try doing this:

 QStateMachine *machine = new QStateMachine;

 QState *state1 = new QState(machine);