N00b Question - FileTreeComponent, how to attach a listener?


I’m a bit lost on this, how do I know what item was clicked, how to attach a listener to the FileTreeComponent (EX) I’m doing? I know how to do the “dirty” way, but since I plan on making the code public, I rather do the Right way. :oops:



erm… call addListener? (I can’t think of a “dirty” way!)


Hehe, ok, I know that, but I couldn’t figure out HOW to do that. :oops: But don’t worry, I will read more, until I do. :wink:

Ok, here’s the Dirty way. I just add a void pointer variable to the class, something like Owner or edEditor. Then, during startup, I just do

fileTree = new FileTreeComponentEx(…, this)

Now, inside FileTreeComponentEx I just do ((Editor*)owner)->whateverIwantFromTheEditor…

EG: ((Editor*)owner)->LoadNewFileFromTreeview(File file);

Its simple, but its “dirty”. :mrgreen:



Oh, I see - you mean you’re adding your own type of listener, not a juce listener class? Well, just copy the way all the juce classes do their listeners.


Ahhhh, yeah, I will check that, makes sense…

Thanks again Jules.



Ok, I understand now. Here’s some quick examples for N00bs like me, that have a hard time understand the simple things. :oops:

For example, I created my own component that I want to send a message that something was changed to the Plugin / Filter / Owner.

So, in my new component class, I add “public ChangeBroadcaster” to the construction. EX:

class FileTreeMain : public Component, public ButtonListener, public ChangeBroadcaster {

Now, when I want to inform that something was changed, I call:

Now, I also use a public variable that holds what was changed, in this case, the name of the file that was selected from the list. (File newFile)

Now, in my Plugin Editor (GUI), I add public ChangeListener to its construction class:

class EditorComponent : public AudioProcessorEditor, public ChangeListener { public: void changeListenerCallback (void* source);

And in the changeListenerCallback call, I can check if source == the object I created for the file selection class above. EX:

void EditorComponent::changeListenerCallback (void* source) { if (source == (void*)fileTreeMain) { // Here I get the filename - fileTreeMain->loadFile.getFullPathName()); } }

I hope this is handy for those learning things now. 8)