How to make mouse listeners independent from nested child components?

General JUCE discussion
1

Hello,
the problem seems to be trivial. I just need mouse enter and exit events for Component which has inside many small child Components. By default it doesn’t work (or I do something wrong).
So to make it work I need for each child call in my parentComponent something like that:

childComponent01.addMouseListener(this, true);
childComponent02.addMouseListener(this, true);
childComponent03.addMouseListener(this, true);
//... and so on

And that would be OK, but the problem is my parentComponent::mouseExit() is called every time I exit from any child Component, even though mouse is still in the parent component bounds.

So I tried to check if:

parentComponent::mouseExit(const MouseEvent& e)
{
    if(!getLocalBounds().contains(e.getEventRelativeTo(this).getPosition()))
    {
        //something that I need to do on mouse exit
    }
}

And it almost work as I expect, but sometimes when I exit mouse with very slow move then if statement is not passed. So I am confused now because it looks like I don’t know how to make mouseExit() work for component which I wish and not dependent on child components.

For any help great thanks in advance.
Best Regards

2

Note that you don’t have to call addMouseListener() for every child. You can register yourself as a listener to all children with a single :

ParentComponent()
{
    addMouseListener (this, true);
}

Regarding the test, i’m not sure if it’s the issue you’re having, but your test would fail to do what you want (if I understood your need correctly) when the mouse goes from a child component to another.
You could try something like that instead:

ParentComponent::mouseExit (const MouseEvent&) override
{
    if (! isMouseOverOrDragging (true)
    {
    }
}
3

Hello lalala, thanks for your answer.
That’s fun I missed I can add mouse listener with one call of addMouseListener. For sure I will use it.

But the main problem is not I need to be notified when mouse enter/exit child Compinents. What I need is to be notified when mouse enter/exit my main Component independently of his child Components.

4

Ha ha ha, actually your suggestion works perfectly but only for mouseExit().

ParentComponent()
{
    addMouseListener (this, true);
}

And:

ParentComponent::mouseExit (const MouseEvent&) override
{
    if (! isMouseOverOrDragging (true)
    {
    }
}

It works perfectly for me. But… Man it’s killing me, ha ha ha. Now I have problems with mouseEnter().

With your code my parentComponent::mouseExit() is called only ones as I expect (I mean it goes only once inside if(! isMouseOverOrDragging (true))). But parentComponent::mouseEnter() is still called as many times as I move mouse on child components. And I can’t handle it.
I tried to call inside parentComponent::mouseEnter():

if (isMouseOverOrDragging (true))

But it is passed every time I enter to any child component, so actually it doesn’t make a difference.
So I tried:

if (isMouseOverOrDragging (false))

But in that case it is never passed.

Hmm… maybe here you have also any super duper advice?
Best regards and great thanks in advance.

5

not sure what you’re trying to achieve and if there’s a smarter way to do it, but you can perhaps just use a boolean:

ParentComponent()
{
    addMouseListener (this, true);
}


void mouseExit (const MouseEvent&) override
{
    if (! isMouseOverOrDragging (true)
    {
         isInside = false;
         ...
    }
}

void mouseEnter (const MouseEvent&) override
{
    if (! isInside && isMouseOverOrDragging (true)
    {
         isInside = true;
         ...
    }
}

bool isInside = false;
6

Great thanks lalala, that’s exactly what I want to achieve, but I was sure I can do that without any new bool variables. But that works for me so it’s perfect. Thanks.