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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 android.view.inputmethod.BaseInputConnection;
import android.view.inputmethod.CompletionInfo;
import android.view.inputmethod.ExtractedText;
import android.view.inputmethod.ExtractedTextRequest;
import android.view.inputmethod.InputMethodManager;
import android.view.inputmethod.SurroundingText;
import android.view.KeyEvent;
import android.text.Editable;
import android.util.Log;
/* Android input methods, take number six.
See EmacsEditable for more details. */
public class EmacsInputConnection extends BaseInputConnection
{
private static final String TAG = "EmacsInputConnection";
public EmacsView view;
private EmacsEditable editable;
/* The length of the last string to be committed. */
private int lastCommitLength;
int currentLargeOffset;
public
EmacsInputConnection (EmacsView view)
{
super (view, false);
this.view = view;
this.editable = new EmacsEditable (this);
}
@Override
public Editable
getEditable ()
{
return editable;
}
@Override
public boolean
setComposingText (CharSequence text, int newCursorPosition)
{
editable.compositionStart ();
super.setComposingText (text, newCursorPosition);
return true;
}
@Override
public boolean
setComposingRegion (int start, int end)
{
int i;
if (lastCommitLength != 0)
{
Log.d (TAG, "Restarting composition for: " + lastCommitLength);
for (i = 0; i < lastCommitLength; ++i)
sendKeyEvent (new KeyEvent (KeyEvent.ACTION_DOWN,
KeyEvent.KEYCODE_DEL));
lastCommitLength = 0;
}
editable.compositionStart ();
super.setComposingRegion (start, end);
return true;
}
@Override
public boolean
finishComposingText ()
{
editable.compositionEnd ();
return super.finishComposingText ();
}
@Override
public boolean
beginBatchEdit ()
{
editable.beginBatchEdit ();
return super.beginBatchEdit ();
}
@Override
public boolean
endBatchEdit ()
{
editable.endBatchEdit ();
return super.endBatchEdit ();
}
@Override
public boolean
commitText (CharSequence text, int newCursorPosition)
{
editable.compositionEnd ();
super.commitText (text, newCursorPosition);
/* An observation is that input methods rarely recompose trailing
spaces. Avoid re-setting the commit length in that case. */
if (text.toString ().equals (" "))
lastCommitLength += 1;
else
/* At this point, the editable is now empty.
The input method may try to cancel the edit upon a subsequent
backspace by calling setComposingRegion with a region that is
the length of TEXT.
Record this length in order to be able to send backspace
events to ``delete'' the text in that case. */
lastCommitLength = text.length ();
Log.d (TAG, "commitText: \"" + text + "\"");
return true;
}
/* Return a large offset, cycling through 100000, 30000, 0.
The offset is typically used to force the input method to update
its notion of ``surrounding text'', bypassing any caching that
it might have in progress.
There must be another way to do this, but I can't find it. */
public int
largeSelectionOffset ()
{
switch (currentLargeOffset)
{
case 0:
currentLargeOffset = 100000;
return 100000;
case 100000:
currentLargeOffset = 30000;
return 30000;
case 30000:
currentLargeOffset = 0;
return 0;
}
currentLargeOffset = 0;
return -1;
}
}
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