[SOLVED] How to access Graphics Context from another class indirectly?

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22

I want this on a t-shirt.

Listener’s aren’t anything magic, they’re just base classes (or structs) that can be used to inform objects about changes in another object. Here’s a super basic example using JUCE’s ListenerList class:

class MyCoolClass
{
public:
    void setValue(int newValue)
    {
        value = newValue;
        listeners.call([this](Listener& l) {
            l.coolClassValueChanged(*this, value);
        });
    }

    struct Listener
    {
        virtual ~Listener() = default;
        virtual void coolClassValueChanged(MyCoolClass&, int newValue) = 0;
    }

    void addListener(Listener* newListener) { listeners.add(newListener); }
    void removeListener(Listener* listenerToRemove) { listeners.remove(listenerToRemove); }

private:
    int value = 0;
    juce::ListenerList<Listener> listeners;
};

Here’s the juce::Slider::Listener implementation:

23

Thank you James!