Pierre Lamot authored 6 months ago and Felix Paul Kühne committed 5 months ago

this allows to handle the part that requires the deleteLater within the MediaLib
class, this will allow us to handle the lifecycle of MediaLib like the other singletons

Pierre Lamot authored 6 months ago and Felix Paul Kühne committed 5 months ago

we don't need to store the image provider inside the medialibray as it's only
useful to the QMLEngine. We only needed it fot crafting URL, but this can be
done with a stateless function.

Fatih Uzunoğlu authored 11 months ago and Steve Lhomme committed 10 months ago

This reverts commit 23e220ab.

Lyndon Brown authored 3 years ago and Hugo Beauzée-Luyssen committed 3 years ago

Note that in some cases they have been changed to forward declarations, and
in some they have been moved, for instance inclusion of `<QUrl>` was moved
from `qt.hpp` to where it was needed.

Pierre Lamot authored 3 years ago and Jean-Baptiste Kempf committed 3 years ago

this allows not depending on vlc_medialibrary_t being present in MLBase

Pierre Lamot authored 3 years ago and Jean-Baptiste Kempf committed 3 years ago

this function allows to run lambdas on the ML thread, this should be used to
perform operation that requires to call vlc_ml_xxx functions as vlc_ml_xxx
should *not* be called from the UI thread

obj: this is the instance of the calling QObject, we ensure that this object is
still live when calling the ui callback, if this object gets destroyed the task
is canceled

mlCb: this callback is executed in a background thread (thread pool), it takes
as arguments the instance of the medialibrary, and a context, the context can be
modified to pass data to the UI callback

uiCB: this callback is executed on the Qt thread, it takes as first argument the
id of the tasks, and as second argument the context that was created for the ML
callback

queue: this allow the task to be ran on a specific thread, when this parameter
isn't provided, the task can be scheduled on any thread.

Ctx is the type of context, this context is created by the runner and passed
sequentially to the ML callback then to UI callback, the ML callback may modify
its properties as a way to pass data to the UI callback

 the ml callback **SHOULD NOT** capture the obj object or point to its
properties by reference, as the obj object may potentially be destroyed when the
function is called

the ui callback **MAY** capture the object obj as we will ensure that the object
still exists before calling the callback

the uiCb **MAY NOT** be called if the object obj is released earlier

anything stored int the context Ctx **MUST** auto release when the context is
destroyed

sample usage:

```
    //structure used to pass data from the ML thread to the UI thread
    struct Ctx {
        bool success;
    };
    m_mediaLib->runOnMLThread<Ctx>(
    //reference to the object making the call, this is used to ensure that
    //the caller still exists before calling the UI callback
    this,
    //ML thread, data needed from the caller are passed in the capture of the lambda
    //capturing this or any of its member is not allowed here
    //the callback have in parametters the ml instance and a context that will be shared with
    //the UI callback
    [url, indexed](vlc_medialibrary_t* ml, Ctx& ctx)
    {
        int res;
        if ( indexed )
            res = vlc_ml_add_folder(  ml, qtu( url ) );
        else
            res = vlc_ml_remove_folder( ml, qtu( url ) );
        ctx.success = (res == VLC_SUCCESS);
    },
    //UI callback, capturing this is allowed, (runOnMLThread will ensure that `this`
    //still exists at this point
    //the callback has as parametters the request id and the shared context
    [this, indexed](quint64, Ctx& ctx){
        if (ctx.success)
        {
            m_indexed = indexed;
            emit isIndexedChanged();
        }
    },
    //allow to specify if the task should be run on a specific thread, null (default) will run on any thread
    "ML_FOLDER_ADD_QUEUE");
```

Pierre Lamot authored 3 years ago and Jean-Baptiste Kempf committed 3 years ago

this ensure that non-empty media list is added to the playlist

fix: #26139

Fatih Uzunoğlu authored 3 years ago and Hugo Beauzée-Luyssen committed 3 years ago

in the qt codebase properties are often used but they are not
overridden by a derived class.

according to the Qt docs, the presence of final attribute can
be used for performance optimizations.

  This is a preparatory commit

Co-authored-by: Romain Vimont <rom1v@videolabs.io>

Prince Gupta authored 4 years ago and Pierre Lamot committed 4 years ago

Signed-off-by: Pierre Lamot <pierre@videolabs.io>

Romain Vimont authored 4 years ago and Pierre Lamot committed 4 years ago

The item id sometimes represents the id of the "current" item, sometimes
the id of the "parent" item. Therefore, the fact that it is a "parent"
id depends on the context, and is not intrinsic to the type.

This caused confusion when getId() returned a MLParentId, representing
the id of the current item.

Rename to MLItemId to clarify.

Signed-off-by: Pierre Lamot <pierre@videolabs.io>

Romain Vimont authored 4 years ago and Pierre Lamot committed 4 years ago

The database queries, initiated by list models, must be executed
asynchronously (on a thread different from the UI thread).

When a list model is destroyed (from the UI thread), some database
queries might still be executing. It would be incorrect for the list
model to wait for them (it would block the UI thread), so they must be
executed on an external thread pool.

Since the queries themselves require the medialib to be executed, they
must not outlive it (or the asynchronous code might crash). Therefore,
the right scope for executing asynchronous queries is the MediaLib
instance.

Signed-off-by: Pierre Lamot <pierre@videolabs.io>

  Recent medias are now stored in the medialibrary.

  grid/list mode is not restricted to medialibrary views

Pierre Lamot authored 5 years ago and Jean-Baptiste Kempf committed 5 years ago

  no functional changes

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Pierre Lamot authored 5 years ago and Jean-Baptiste Kempf committed 5 years ago

this avoids handling the logic in QML

Pierre Lamot authored 6 years ago and Thomas Guillem committed 5 years ago

Signed-off-by: Thomas Guillem <thomas@gllm.fr>