QStateMachine and dependent properties



  • setting states
    @
    state_downloading_ = new QState(&state_machine_);
    state_downloading_->assignProperty(download_button_, "enabled", false);

    state_download_finished_ = new QState(state_machine_);
    state_download_finished_->assignProperty(download_button_, "enabled", true);

    state_general_ = new QState(&state_machine_);
    state_general_->assignProperty(download_button_, "enabled", true);

    state_loading_theme_ = new QState(&state_machine);
    state_loading_theme_->assignProperty(download_button_, "enabled", false);
    @

    setting transition
    @
    state_downloading_->addTransition(this, SIGNAL(download_finish()), state_download_finish_);
    state_download_finished_->addTransition(loading_button_, SIGNAL(clicked()), state_loading_theme_);

    state_general_->addTransition(download_button_, SIGNAL(clicked()), state_downloading_);
    state_general_->addTransition(loading_button_, SIGNAL(clicked()), state_loading_theme_);

    state_loading_theme_->addTransition(this, SIGNAL(loading_finish()), state_general_);
    @

    The problem is, these states are asynchronous and the properties of
    the download button is dependent on the states
    That means something like

    state_downloading_->disabled button->state_download_finished_->button_enabled
    state_loading_theme_->disabled button--------------------------->still downloading and the button should be disabled

    I could solve this by mutex and without setting the property of the button by assignProperty
    But this is ugly, do I have better choices?Thanks


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