[SOLVED] wxWidgets

apoorv569 · 01-22-2021, 10:41 AM

Can someone please explain how looping a media works with wxMediaCtrl. I am fairly new wxWidgets and C++ in general, but not a complete beginner at this point, I'm making a application for browsing and managing audio samples, so far with wxMediaCtrl I'm able to load, play and stop media at will, by simply calling MediaCtrl->Load() or MediaCtrl->Play(), but I can't understand how to loop a media after it finishes playing, reading the documentation and the provided sample from wxWidgets, which is far too long, I do understand that I need to catch wxEVT_MEDIA_FINISHED, and make a function that does when this event is fired. But I can't get it to work. I have a function to play media when a button is pressed like,

Code:

void Browser::OnClickPlay(wxCommandEvent& event)
{
    wxString selection = SampleListView->GetTextValue(SampleListView->GetSelectedRow(), 1);
    wxString sample = db.GetSamplePathByFilename(std::string(selection));

    MediaCtrl->Load(sample);
    MediaCtrl->Play();
}

Where SampleListView is a wxDataViewListCtrl, and db is SQLite3 database from where I'm grabbing the path to the file to load media in, and I have binded all event like,

Code:

    Bind(wxEVT_BUTTON, &Browser::OnClickPlay, this, BCID_Play);
    Bind(wxEVT_TOGGLEBUTTON, &Browser::OnClickLoop, this, BCID_Loop);
    Connect(BCID_Loop, wxEVT_MEDIA_FINISHED, (wxObjectEventFunction)(wxEventFunction)(wxMediaEventFunction) &Browser::OnMediaFinished);
    Bind(wxEVT_DATAVIEW_SELECTION_CHANGED, &Browser::OnClickSampleView, this, BCID_SampleListView);

This works, and I have similar function when a user click on SampleListView row it plays depending on the row number and filename, and I have a toggle button for loop that by it self just toggles a bool Looping to true or false, depending on the state of the button,

Code:

void Browser::OnClickLoop(wxCommandEvent& event)
{
    if (LoopButton->GetValue())
    {
        Looping = true;
    }
    else
    {
        Looping = false;
    }
}

and the function that deals with wxEVT_MEDIA_FINISHED is,

Code:

void Browser::OnMediaFinished(wxMediaEvent& event)
{
    if (Looping)
    {
        if ( !MediaCtrl->Play() )
        {
            wxLogDebug("Could not loop");
            MediaCtrl->Load(db.GetSamplePathByFilename(SampleListView->GetTextValue(SampleListView->GetSelectedRow(), 1).ToStdString()));
            MediaCtrl->Play();
        }
    }
}

I cannot get it work or able to understand how to do it, if someone can maybe write a short example for looping media that would be great help.

apoorv569 · 01-24-2021, 08:44 AM

Quote:

Originally Posted by apoorv569

Can someone please explain how looping a media works with wxMediaCtrl. I am fairly new wxWidgets and C++ in general, but not a complete beginner at this point, I'm making a application for browsing and managing audio samples, so far with wxMediaCtrl I'm able to load, play and stop media at will, by simply calling MediaCtrl->Load() or MediaCtrl->Play(), but I can't understand how to loop a media after it finishes playing, reading the documentation and the provided sample from wxWidgets, which is far too long, I do understand that I need to catch wxEVT_MEDIA_FINISHED, and make a function that does when this event is fired. But I can't get it to work. I have a function to play media when a button is pressed like,

Code:

void Browser::OnClickPlay(wxCommandEvent& event)
{
    wxString selection = SampleListView->GetTextValue(SampleListView->GetSelectedRow(), 1);
    wxString sample = db.GetSamplePathByFilename(std::string(selection));

    MediaCtrl->Load(sample);
    MediaCtrl->Play();
}

Where SampleListView is a wxDataViewListCtrl, and db is SQLite3 database from where I'm grabbing the path to the file to load media in, and I have binded all event like,

Code:

    Bind(wxEVT_BUTTON, &Browser::OnClickPlay, this, BCID_Play);
    Bind(wxEVT_TOGGLEBUTTON, &Browser::OnClickLoop, this, BCID_Loop);
    Connect(BCID_Loop, wxEVT_MEDIA_FINISHED, (wxObjectEventFunction)(wxEventFunction)(wxMediaEventFunction) &Browser::OnMediaFinished);
    Bind(wxEVT_DATAVIEW_SELECTION_CHANGED, &Browser::OnClickSampleView, this, BCID_SampleListView);

This works, and I have similar function when a user click on SampleListView row it plays depending on the row number and filename, and I have a toggle button for loop that by it self just toggles a bool Looping to true or false, depending on the state of the button,

Code:

void Browser::OnClickLoop(wxCommandEvent& event)
{
    if (LoopButton->GetValue())
    {
        Looping = true;
    }
    else
    {
        Looping = false;
    }
}

and the function that deals with wxEVT_MEDIA_FINISHED is,

Code:

void Browser::OnMediaFinished(wxMediaEvent& event)
{
    if (Looping)
    {
        if ( !MediaCtrl->Play() )
        {
            wxLogDebug("Could not loop");
            MediaCtrl->Load(db.GetSamplePathByFilename(SampleListView->GetTextValue(SampleListView->GetSelectedRow(), 1).ToStdString()));
            MediaCtrl->Play();
        }
    }
}

I cannot get it work or able to understand how to do it, if someone can maybe write a short example for looping media that would be great help.

Okay, I was able to fix it, it works now. All of this code above is correct its just I had wrong control ID in the Bind(), I put the ID of Loop button rather than MediaCtrl it self.

astrogeek · 01-24-2021, 01:45 PM

Thanks for updating us with your fix!

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