Using TreeViewItem::getOpennessState with a FileTreeComponent

General JUCE discussion
1

I’m attempting to call TreeViewItem::getOpennessState on a FileTreeComponent object, however I’m hitting the assert in the method (“trying to save the openness for an element that has no name”).

As far as I can see, the FileListTreeItem class overrides the TreeViewItem::getUniqueName method to give it a unique name, and FileTreeComponent uses the FileListTreeItem class.

Therefore what am I likely doing wrong to result in this error?

Thanks.

2

I’m no closer to solving this, so thought I’d share some test code so that hopefully someone can spot what I’m missing.

Here is the code from a test FileTreeComponent project - the FileTreeComponent code is exactly the same as the ImagesDemo in the JUCE demo project:

Declarations:

//==============================================================================
    // Your private member variables go here...
    
    WildcardFileFilter imagesWildcardFilter  { "*.jpeg;*.jpg;*.png;*.gif", "*", "Image File Filter"};
    TimeSliceThread directoryThread          { "Image File Scanner Thread" };
    DirectoryContentsList imageList          { &imagesWildcardFilter, directoryThread };
    FileTreeComponent fileTree               { imageList };

Constructor:

 imageList.setDirectory (File::getSpecialLocation (File::userPicturesDirectory), true, true);
    directoryThread.startThread (Thread::Priority::background);

    fileTree.setTitle ("Files");
    fileTree.addListener (this);
    fileTree.setColour (TreeView::backgroundColourId, Colours::grey);
    addAndMakeVisible (fileTree);

void MainComponent::buttonClicked (Button* button)
{
    if (button == &testButton)
    {
        auto opennessState = fileTree.getOpennessState (true); //JUCE Assertion failure in juce_TreeView.cpp:2191
    }
}

Here is the complete project:
FileTreeComponentTest.zip (6.9 KB)

Thanks.

3

FYI I’ve now figured out the solution / fix - the FileTreeComponent object needs to be defined after calling DirectoryContentsList::setDirectory, otherwise the root FileListTreeItem can’t get the directory from DirectoryContentsList which is used to set the unique name.

1 Like