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package eu.siacs.conversations.ui.widget;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.text.Selection;
import android.text.Spannable;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
public class ListSelectionManager {
private static final int MESSAGE_SEND_RESET = 1;
private static final int MESSAGE_RESET = 2;
private static final int MESSAGE_START_SELECTION = 3;
private static final Handler HANDLER = new Handler(Looper.getMainLooper(), new Handler.Callback() {
@Override
public boolean handleMessage(Message msg) {
switch (msg.what) {
case MESSAGE_SEND_RESET: {
// Skip one more message queue loop
HANDLER.obtainMessage(MESSAGE_RESET, msg.obj).sendToTarget();
return true;
}
case MESSAGE_RESET: {
final ListSelectionManager listSelectionManager = (ListSelectionManager) msg.obj;
listSelectionManager.futureSelectionIdentifier = null;
return true;
}
case MESSAGE_START_SELECTION: {
final StartSelectionHolder holder = (StartSelectionHolder) msg.obj;
holder.listSelectionManager.futureSelectionIdentifier = null;
startSelection(holder.textView, holder.start, holder.end);
return true;
}
}
return false;
}
});
private static class StartSelectionHolder {
public final ListSelectionManager listSelectionManager;
public final TextView textView;
public final int start;
public final int end;
public StartSelectionHolder(ListSelectionManager listSelectionManager, TextView textView,
int start, int end) {
this.listSelectionManager = listSelectionManager;
this.textView = textView;
this.start = start;
this.end = end;
}
}
private ActionMode selectionActionMode;
private Object selectionIdentifier;
private TextView selectionTextView;
private Object futureSelectionIdentifier;
private int futureSelectionStart;
private int futureSelectionEnd;
public void onCreate(TextView textView) {
final CustomCallback callback = new CustomCallback(textView);
textView.setCustomSelectionActionModeCallback(callback);
}
public void onUpdate(TextView textView, Object identifier) {
if (SUPPORTED) {
CustomCallback callback = (CustomCallback) textView.getCustomSelectionActionModeCallback();
callback.identifier = identifier;
if (futureSelectionIdentifier == identifier) {
HANDLER.obtainMessage(MESSAGE_START_SELECTION, new StartSelectionHolder(this,
textView, futureSelectionStart, futureSelectionEnd)).sendToTarget();
}
}
}
public void onBeforeNotifyDataSetChanged() {
if (SUPPORTED) {
HANDLER.removeMessages(MESSAGE_SEND_RESET);
HANDLER.removeMessages(MESSAGE_RESET);
HANDLER.removeMessages(MESSAGE_START_SELECTION);
if (selectionActionMode != null) {
final CharSequence text = selectionTextView.getText();
futureSelectionIdentifier = selectionIdentifier;
futureSelectionStart = Selection.getSelectionStart(text);
futureSelectionEnd = Selection.getSelectionEnd(text);
selectionActionMode.finish();
selectionActionMode = null;
selectionIdentifier = null;
selectionTextView = null;
}
}
}
public void onAfterNotifyDataSetChanged() {
if (SUPPORTED && futureSelectionIdentifier != null) {
HANDLER.obtainMessage(MESSAGE_SEND_RESET, this).sendToTarget();
}
}
private class CustomCallback implements ActionMode.Callback {
private final TextView textView;
public Object identifier;
public CustomCallback(TextView textView) {
this.textView = textView;
}
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
selectionActionMode = mode;
selectionIdentifier = identifier;
selectionTextView = textView;
return true;
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return true;
}
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
return false;
}
@Override
public void onDestroyActionMode(ActionMode mode) {
if (selectionActionMode == mode) {
selectionActionMode = null;
selectionIdentifier = null;
selectionTextView = null;
}
}
}
private static final Field FIELD_EDITOR;
private static final Method METHOD_START_SELECTION;
private static final boolean SUPPORTED;
static {
Field editor;
try {
editor = TextView.class.getDeclaredField("mEditor");
editor.setAccessible(true);
} catch (Exception e) {
editor = null;
}
FIELD_EDITOR = editor;
Method startSelection = null;
if (editor != null) {
String[] startSelectionNames = {"startSelectionActionMode", "startSelectionActionModeWithSelection"};
for (String startSelectionName : startSelectionNames) {
try {
startSelection = editor.getType().getDeclaredMethod(startSelectionName);
startSelection.setAccessible(true);
break;
} catch (Exception e) {
startSelection = null;
}
}
}
METHOD_START_SELECTION = startSelection;
SUPPORTED = FIELD_EDITOR != null && METHOD_START_SELECTION != null;
}
public static boolean isSupported() {
return SUPPORTED;
}
public static void startSelection(TextView textView) {
startSelection(textView, 0, textView.getText().length());
}
public static void startSelection(TextView textView, int start, int end) {
final CharSequence text = textView.getText();
if (SUPPORTED && start >= 0 && end > start && textView.isTextSelectable() && text instanceof Spannable) {
final Spannable spannable = (Spannable) text;
start = Math.min(start, spannable.length());
end = Math.min(end, spannable.length());
Selection.setSelection(spannable, start, end);
try {
final Object editor = FIELD_EDITOR != null ? FIELD_EDITOR.get(textView) : textView;
METHOD_START_SELECTION.invoke(editor);
} catch (Exception e) {
}
}
}
}
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