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Drag and Drop function

General JUCE discussion
#1

Hello everybody !

Here is my problem : I want to add a Drag and Drop feature in my program to allow the drag and drop of MIDI files into Tracktion… I know it’s possible to do this because I have tried to drag and drop a MID between Tracktion and the Windows’ Explorer window…

How can I do this with Juce ? The function I must use is this one but I don’t know how to configure it…

#2

no, that’s only for internal juce-based dragging, it can’t drag things outside into other apps.

Check out PlatformUtilities::canDropFilesAtMousePosition() and dropFilesAtMousePosition(). You can use these in your mouseDrag() and mouseUp() methods, and set the cursor appropriately.

#3

OK, I will check it, thanks for the answers :wink:

(Tracktion 2 Ruuuuuuuules) 8)

#4

its not out yet is it???

or are you a beta tester :twisted: :stuck_out_tongue:

#5

No, a friend was at the NAMM in France and have seen it :lol:

#6

Oops Jules, I think I have found a bug in Juce… First Check what I have written :

[code]void mouseDrag (const MouseEvent& e)
{
dragCours = true;
}

void mouseUp (const MouseEvent& e)
{
StringArray sa;

  if (dragCours)
  {
        sa.add(fileHard->getFullPathName());
                        
        if (PlatformUtilities::canDropFilesAtMousePosition())
              PlatformUtilities::dropFilesAtMousePosition(sa);
  }
  dragCours = false;

}[/code]

As you have understood, that doesn’t work, and if I try for example to drag in the Dev C++ Explorer, it shows me one window for each character in the path, for “C:\Win.mid” it says me :

“Can’t find C”
“Can’t find :”
"Can’t find "
“Can’t find W” etc. etc. etc.

But if i drag and drop from the Windows’ Explorer windows, that works. So maybe a bug in Juce ?

#7

hmm - must be because it’s passing windows a unicode filename… I’ll investigate.

#8

yeah - looks like I messed up. The line in PlatformUtils.cpp that says

pDropFiles->fWide = SystemStats::getOSType() == SystemStats::Win95 || SystemStats::getOSType() == SystemStats::Win98;

should just be:

pDropFiles->fWide = true;

God knows what I was thinking when I wrote that…

#9

Thanks, I will try :wink:

#10

I have modified the line, recompiled the Juce library and the problem is still alive… I precise I’m working with Win98 :cry:

#11

Another question that’s slightly off topic:
Is there any way to have drag and drop between two running instances of the same app?

#12

oh, maybe win98 doesn’t handle the wide char stuff properly. Try setting the value to false and see if that works - I’ll have a proper look at it for the next release…

#13

Thanks :wink:

#14

[quote=“jtxx000”]Another question that’s slightly off topic:
Is there any way to have drag and drop between two running instances of the same app?[/quote]

i guess that’s a no… :stuck_out_tongue:

#15

well you can use the normal drag + drop, like you would between juce and non-juce apps, but not the clever internal drag-and-drop stuff because they don’t live in the same memory-space.

#16

i tried using dropFilesAtMousePosition() but it doesn’t seem to be working for some reason. When i try to drag between two instances of my app canDropoFilesAtMousePosition() returns true but dropFilesAtMousePosition() doesn’t call the filesDropped() method on the other app. if you try to drop a file from my app to windows explorer canDropoFilesAtMousePosition() returns false.

what am i doing wrong?

#17