1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 20:17:44 +00:00

LibGUI: Implement persistent indices for models

This patch adds persistent indices to models.  A PersistentModelIndex is
a ModelIndex that will survive most model updates (provided that the
data the PersistentModelIndex points to has not been removed by the
model's data store).  PersistentModelIndex objects can be safely held
by objects outside the model they originated from.
This commit is contained in:
sin-ack 2021-05-13 09:07:43 +00:00 committed by Andreas Kling
parent 1408aa1295
commit d73116e5d5
7 changed files with 221 additions and 1 deletions

View file

@ -6,6 +6,7 @@
#include <LibGUI/AbstractView.h>
#include <LibGUI/Model.h>
#include <LibGUI/PersistentModelIndex.h>
namespace GUI {
@ -71,6 +72,25 @@ void Model::unregister_client(ModelClient& client)
m_clients.remove(&client);
}
WeakPtr<PersistentHandle> Model::register_persistent_index(Badge<PersistentModelIndex>, const ModelIndex& index)
{
if (!index.is_valid())
return {};
auto it = m_persistent_handles.find(index);
// Easy modo: we already have a handle for this model index.
if (it != m_persistent_handles.end()) {
return it->value->make_weak_ptr();
}
// Hard modo: create a new persistent handle.
auto handle = adopt_own(*new PersistentHandle(index));
auto weak_handle = handle->make_weak_ptr();
m_persistent_handles.set(index, move(handle));
return weak_handle;
}
RefPtr<Core::MimeData> Model::mime_data(const ModelSelection& selection) const
{
auto mime_data = Core::MimeData::construct();