switch to Spectogram display by code

[jerome42]

Hi,

The whole message cracking of Audacity is quite complex and I haven't found a layout which explains the headlines (if there is one). Therefor this question:

I am looking for a message or a software command or something alike with which I can write C++ code (Windows) to switch between the Waveform and Spectogram display like when you use the mouse to hit those menu entries in the Trackinfo screen of the GuiStereoTrack.
Until now I arrived at the code (TrackPanel::HandleLabelClick(wxMouseEvent & event) ) which causes the popup menu to popup. But in debug mode that popup screen is already gone before I can hit the menu item 'Spectogram' to find out what happens next, or what message is constructed for doing the switching job.

Any help is awfully welcome!
regards,
jerome42

[Gale Andrews]

I am looking for a message or a software command or something alike with which I can write C++ code (Windows) to switch between the Waveform and Spectogram display like when you use the mouse to hit those menu entries in the Trackinfo screen of the GuiStereoTrack.

Just another reminder that no Audacity developers use the Forum.

I would guess Ed (user Edgar) may be able to help you.

Anyhow, does setting a breakpoint after the menu disappears help?

I have not looked, but is there an entry in GetAllMenuCommands in scripting:
http://manual.audacityteam.org/o/man/scripting.html ?


Gale

[steve]

The track drop down menu uses index numbers for each menu option.
Line 7170 of TrackPanel.cpp sets the display mode after an option has been selected in the menu:
Waveform: id=1
Waveform (dB): id=2
Spectrogram: id=3
and so on.

Does that help?

[jerome42]

Just another reminder that no Audacity developers use the Forum.
I would guess Ed (user Edgar) may be able to help you.
Gale

Yes, I remember you warned me earlier, but I didn't find how to access the developers group.

Anyhow, does setting a breakpoint after the menu disappears help?
I have not looked, but is there an entry in GetAllMenuCommands in scripting:
http://manual.audacityteam.org/o/man/scripting.html ?
Gale

No, setting a breakpoint after the menu disappears, doesn't help. As far as my understanding goes for the moment, the popup menu is constructed on the fly by wxWitgets, and I guess, it's wxWitgets which generates the menu driven message that finally activates the switching done by TrackPanel::OnSetDisplay(wxCommandEvent & event). So the whole thing is done and cleared already when the debug execution is stopped at the breakpoint you suggested.

Scripting (from an external source) is also no option, as this switching to Spectrum mode is just one task of several others in my planned C++ code.

Anyhow, thanks for responding,
jerome42

[jerome42]

The track drop down menu uses index numbers for each menu option.
Line 7170 of TrackPanel.cpp sets the display mode after an option has been selected in the menu:
Waveform: id=1
Waveform (dB): id=2
Spectrogram: id=3
and so on.

Does that help?

Hello Steve,

Well, you guided me anyhow some steps in the right direction.
Strange is that we do not seem to have exactly the same sources.
My line 7170 of trackPanel.cpp shows: TrackPanel::OnFormatChange(wxCommandEvent & event) and this code is not touched when switching to Spectrum view.
A few lines earlier on 7125, I found TrackPanel::OnSetDisplay(wxCommandEvent & event), which indeed does the switching.
Invoking this subroutine directly is problematic, because it is a protected routine, not accessible from outside and it also requires a correctly constructed event, although that could be circumvented by a dummy construct.
Both approaches require some changes in the TrackPanel code and that will not match the quality requirements(?) of the Audacity team, I guess.
The best solution remains a message, but how should that look like.
So I am afraid I have to do some diving into the wxWidhets code.

thanks and kind regards,
jerome42

[steve]

TrackPanel::OnSetDisplay(wxCommandEvent & event)

Yes, that's what I was looking at.
In the current svn sourcecode that is line 7160 and line 7170 is wt->SetDisplay(id);
Development work is usually done against svn head so that it's not out of date before you finish

[Gale Andrews]

I didn't find how to access the developers group.

You would have to subscribe to the audacity-devel mailing list:
https://lists.sourceforge.net/lists/lis ... city-devel

however you are very unlikely to get help unless you give them some idea of the purpose of your code changes and how this might be useful to Audacity.

Steve is gradually getting into Widgets and C++ I think (thanks, Steve) but generally there may be many questions you have that you won't find an answer to here.


Gale

[steve]

Steve is gradually getting into Widgets and C++ I think

"Gradually" being the important word Although I've made quite a lot of Nyquist plug-ins I'm a noob with C++ and WxWidgets.

[Edgar]

Hi Jerome42!

I got your PM and apologize for not chiming in the earlier on this thread; the subject matter is way out of my area of familiarity - I've never actually used the Spectrogram display. A quick read through of your PM and this thread leaves me a little bit in the dark (not an uncommon occurrence - I often have a hard time understanding other folk's descriptions when Gale and Steve seem to find them obvious <grin>); I have some spare time for the next couple days so will try to get up to speed and see if I can help you out. More later…

[jerome42]

I have some spare time for the next couple days so will try to get up to speed and see if I can help you out. More later…

Hi Edgar,
You made my day already now, but I think you know best how to keep enough spare time for yourself!
regards, jerome42