Can create a scrollbar on a component without viewport?

1

Hello, I want to create and make a scrollbar appear on the main component
The document says, a viewport can make a scrollbar easily
However, it doesn’t say a viewport is always required
So can I create a scrollbar without using viewports or listbox etc ?
Thanks

2

Yes sure. Just create one. It is a simple component. You can then listen to the ScrollBar and update your model accordingly.

3

Hello, Daniel
Thank you
However, the scrollbar does not appear on my MainComponent
So what will be further required? Should I assign a listener to it ?

4

The same steps as with any Component are required:

class MyComponent : public juce::Component,
                    private juce::ScrollBar::Listener
{
public:
    MyComponent()
    {
        scrollbar.setAutoHide (false);
        addAndMakeVisible (scrollbar);
        scrollbar.addListener (this);
    }

    ~MyComponent() override
    {
        scrollbar.removeListener (this); // just in case
    }

    void resized() override
    {
        auto bounds = getLocalBounds();
        scrollbar.setBounds (bounds.removeFromRight (20);
    }

    void scrollBarMoved (juce::ScrollBar*, double newRangeStart) override
    {
        // do something
    }

private:
    juce::ScrollBar scrollbar { false };
};

and make sure you don’t have another component occlude the scrollbar. Either call addAndMakeVisible last for the scrollbar, or call toFront() at the end of the constructor.

5

Hello, Daniel, now it works all right !
Thank you so much for your kindness
See you

6

I’m glad I could help

7

Good Night, Daniel