I have a crash using juce::TooltipWindow with two plugins in Ardour

Audio Plugins
1

Hello,
I have a problem with juce::TooltipWindow that i don’t understand please.
I wrote a very basic example of Plugin.
Following the example given in JUCE/examples/GUI/WidgetsDemo.h, in the Editor.h i declare:
an object:
juce::TooltipWindow ttw;
Then in Editor.cpp, for a widget i write:
object->setTooltip("text");
I i use only one instance of the plugin in DAW Ardour, this works fine, but if i use two instances, then if the mouse pass on the widget, the message “text” appears but DAW Ardour crashes. The debugger (gdb) message is :

Thread 1 (Thread 0x7ffff7a3b900 (LWP 41172) "ArdourGUI"):
#0  0x00007fffe91f075b in kill () at ../sysdeps/unix/syscall-template.S:120
#1  0x00007fff9193789c in juce::TooltipWindow::displayTipInternal (this=0x555557c2d4e8, screenPos=..., tip=..., shownManually=juce::TooltipWindow::no) at /home/faure/install/musique/JUCE/modules/juce_gui_basics/windows/juce_TooltipWindow.cpp:141
#2  0x00007fff91937cc0 in operator() (__closure=0x7fffffffcea0) at /home/faure/install/musique/JUCE/modules/juce_gui_basics/windows/juce_TooltipWindow.cpp:230
#3  0x00007fff91938013 in juce::TooltipWindow::timerCallback (this=0x555557c2d4e8) at /home/faure/install/musique/JUCE/modules/juce_gui_basics/windows/juce_TooltipWindow.cpp:249
#4  0x00007fff91778c42 in juce::Timer::TimerThread::callTimers (this=0x55555d00dfc0) at /home/faure/install/musique/JUCE/modules/juce_events/timers/juce_Timer.cpp:115
#5  0x00007fff91778e6b in juce::Timer::TimerThread::CallTimersMessage::messageCallback (this=0x7fff38000b90) at /home/faure/install/musique/JUCE/modules/juce_events/timers/juce_Timer.cpp:181
#6  0x00007fff9177ac07 in juce::InternalMessageQueue::InternalMessageQueue()::{lambda(int)#1}::operator()(int) const (__closure=0x55555aa01da0, fd=46) at /home/faure/install/musique/JUCE/modules/juce_events/native/juce_linux_Messaging.cpp:42

etc

May be i use tooltip in a bad way? Thanks,
Frédéric.

2

If you read your stack trace, the oddly named kill is something generally called to deliberately crash due to an unrecoverable error.

It’s interesting to know why juce::TooltipWindow::displayTipInternal called it. Let’s look at the code in juce_TooltipWindow.cpp line 141:

// Looks like you have more than one TooltipWindow showing the same tip..
// Be careful not to create more than one instance of this class with the
// same parent component!
jassertfalse;

Perhaps that comment above the failed assertion can give you a relevant pointer.

3

Btw I just tested to see if Auto-Align 2 exhibits this problem. It doesn’t.

The only difference from what you describe is that we declare

juce::TooltipWindow tooltipWindow {this};

In the plugin’s editor. So it appears to work fine with the added {this} parameter.

4

Yes, thanks it works fine with

juce::TooltipWindow tooltipWindow {this};

In the plugin’s editor.

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