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/* Communication module for Android terminals. -*- c-file-style: "GNU" -*-
Copyright (C) 2023 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
package org.gnu.emacs;
import java.util.LinkedList;
import java.util.List;
import android.content.Intent;
import android.util.Log;
/* Code to paper over the differences in lifecycles between
"activities" and windows. There are four interfaces to an instance
of this class:
registerWindowConsumer (WindowConsumer)
registerWindow (EmacsWindow)
removeWindowConsumer (WindowConsumer)
removeWindow (EmacsWindow)
A WindowConsumer is expected to allow an EmacsWindow to be attached
to it, and be created or destroyed.
Every time a window is created, registerWindow checks the list of
window consumers. If a consumer exists and does not currently have
a window of its own attached, it gets the new window. Otherwise,
the window attachment manager starts a new consumer.
Every time a consumer is registered, registerWindowConsumer checks
the list of available windows. If a window exists and is not
currently attached to a consumer, then the consumer gets it.
Finally, every time a window is removed, the consumer is
destroyed. */
public class EmacsWindowAttachmentManager
{
public static EmacsWindowAttachmentManager MANAGER;
private final static String TAG = "EmacsWindowAttachmentManager";
static
{
MANAGER = new EmacsWindowAttachmentManager ();
};
public interface WindowConsumer
{
public void attachWindow (EmacsWindow window);
public EmacsWindow getAttachedWindow ();
public void detachWindow ();
public void destroy ();
};
private List<WindowConsumer> consumers;
private List<EmacsWindow> windows;
public
EmacsWindowAttachmentManager ()
{
consumers = new LinkedList<WindowConsumer> ();
windows = new LinkedList<EmacsWindow> ();
}
public void
registerWindowConsumer (WindowConsumer consumer)
{
Log.d (TAG, "registerWindowConsumer " + consumer);
consumers.add (consumer);
for (EmacsWindow window : windows)
{
if (window.getAttachedConsumer () == null)
{
Log.d (TAG, "registerWindowConsumer: attaching " + window);
consumer.attachWindow (window);
return;
}
}
Log.d (TAG, "registerWindowConsumer: sendWindowAction 0, 0");
EmacsNative.sendWindowAction ((short) 0, 0);
}
public void
registerWindow (EmacsWindow window)
{
Intent intent;
Log.d (TAG, "registerWindow " + window);
windows.add (window);
for (WindowConsumer consumer : consumers)
{
if (consumer.getAttachedWindow () == null)
{
Log.d (TAG, "registerWindow: attaching " + consumer);
consumer.attachWindow (window);
return;
}
}
intent = new Intent (EmacsService.SERVICE,
EmacsMultitaskActivity.class);
intent.addFlags (Intent.FLAG_ACTIVITY_NEW_DOCUMENT
| Intent.FLAG_ACTIVITY_NEW_TASK
| Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
EmacsService.SERVICE.startActivity (intent);
Log.d (TAG, "registerWindow: startActivity");
}
public void
removeWindowConsumer (WindowConsumer consumer)
{
EmacsWindow window;
Log.d (TAG, "removeWindowConsumer " + consumer);
window = consumer.getAttachedWindow ();
if (window != null)
{
Log.d (TAG, "removeWindowConsumer: detaching " + window);
consumer.detachWindow ();
window.onActivityDetached ();
}
Log.d (TAG, "removeWindowConsumer: removing " + consumer);
consumers.remove (consumer);
}
public void
detachWindow (EmacsWindow window)
{
WindowConsumer consumer;
Log.d (TAG, "detachWindow " + window);
if (window.getAttachedConsumer () != null)
{
consumer = window.getAttachedConsumer ();
Log.d (TAG, "detachWindow: removing" + consumer);
consumers.remove (consumer);
consumer.destroy ();
}
}
};
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