make list selection manager work with app compat
This commit is contained in:
Daniel Gultsch
parent
f9e1e856d2
commit
11736ce48c
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@ -1,8 +1,5 @@
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package eu.siacs.conversations.ui.widget;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import android.os.Handler;
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import android.os.Looper;
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import android.os.Message;
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@ -13,199 +10,202 @@ import android.view.Menu;
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import android.view.MenuItem;
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import android.widget.TextView;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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public class ListSelectionManager {
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private static final int MESSAGE_SEND_RESET = 1;
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private static final int MESSAGE_RESET = 2;
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private static final int MESSAGE_START_SELECTION = 3;
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private static final int MESSAGE_SEND_RESET = 1;
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private static final int MESSAGE_RESET = 2;
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private static final int MESSAGE_START_SELECTION = 3;
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private static final Field FIELD_EDITOR;
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private static final Method METHOD_START_SELECTION;
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private static final boolean SUPPORTED;
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private static final Handler HANDLER = new Handler(Looper.getMainLooper(), new Handler.Callback() {
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private static final Handler HANDLER = new Handler(Looper.getMainLooper(), new Handler.Callback() {
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@Override
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public boolean handleMessage(Message msg) {
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switch (msg.what) {
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case MESSAGE_SEND_RESET: {
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// Skip one more message queue loop
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HANDLER.obtainMessage(MESSAGE_RESET, msg.obj).sendToTarget();
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return true;
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}
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case MESSAGE_RESET: {
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final ListSelectionManager listSelectionManager = (ListSelectionManager) msg.obj;
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listSelectionManager.futureSelectionIdentifier = null;
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return true;
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}
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case MESSAGE_START_SELECTION: {
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final StartSelectionHolder holder = (StartSelectionHolder) msg.obj;
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holder.listSelectionManager.futureSelectionIdentifier = null;
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startSelection(holder.textView, holder.start, holder.end);
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return true;
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}
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}
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return false;
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}
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});
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@Override
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public boolean handleMessage(Message msg) {
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switch (msg.what) {
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case MESSAGE_SEND_RESET: {
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// Skip one more message queue loop
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HANDLER.obtainMessage(MESSAGE_RESET, msg.obj).sendToTarget();
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return true;
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}
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case MESSAGE_RESET: {
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final ListSelectionManager listSelectionManager = (ListSelectionManager) msg.obj;
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listSelectionManager.futureSelectionIdentifier = null;
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return true;
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}
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case MESSAGE_START_SELECTION: {
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final StartSelectionHolder holder = (StartSelectionHolder) msg.obj;
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holder.listSelectionManager.futureSelectionIdentifier = null;
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startSelection(holder.textView, holder.start, holder.end);
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return true;
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}
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}
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return false;
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}
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});
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static {
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Field editor;
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try {
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editor = TextView.class.getDeclaredField("mEditor");
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editor.setAccessible(true);
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} catch (Exception e) {
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editor = null;
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}
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FIELD_EDITOR = editor;
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Method startSelection = null;
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if (editor != null) {
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String[] startSelectionNames = {"startSelectionActionMode", "startSelectionActionModeWithSelection"};
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for (String startSelectionName : startSelectionNames) {
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try {
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startSelection = editor.getType().getDeclaredMethod(startSelectionName);
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startSelection.setAccessible(true);
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break;
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} catch (Exception e) {
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startSelection = null;
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}
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}
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}
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METHOD_START_SELECTION = startSelection;
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SUPPORTED = FIELD_EDITOR != null && METHOD_START_SELECTION != null;
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}
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private static class StartSelectionHolder {
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private ActionMode selectionActionMode;
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private Object selectionIdentifier;
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private TextView selectionTextView;
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private Object futureSelectionIdentifier;
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private int futureSelectionStart;
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private int futureSelectionEnd;
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public final ListSelectionManager listSelectionManager;
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public final TextView textView;
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public final int start;
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public final int end;
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public static boolean isSupported() {
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return SUPPORTED;
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}
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public StartSelectionHolder(ListSelectionManager listSelectionManager, TextView textView,
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int start, int end) {
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this.listSelectionManager = listSelectionManager;
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this.textView = textView;
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this.start = start;
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this.end = end;
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}
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}
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private static void startSelection(TextView textView, int start, int end) {
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final CharSequence text = textView.getText();
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if (SUPPORTED && start >= 0 && end > start && textView.isTextSelectable() && text instanceof Spannable) {
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final Spannable spannable = (Spannable) text;
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start = Math.min(start, spannable.length());
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end = Math.min(end, spannable.length());
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Selection.setSelection(spannable, start, end);
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try {
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final Object editor = FIELD_EDITOR != null ? FIELD_EDITOR.get(textView) : textView;
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METHOD_START_SELECTION.invoke(editor);
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} catch (Exception e) {
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}
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}
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}
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private ActionMode selectionActionMode;
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private Object selectionIdentifier;
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private TextView selectionTextView;
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public void onCreate(TextView textView, ActionMode.Callback additionalCallback) {
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final CustomCallback callback = new CustomCallback(textView, additionalCallback);
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textView.setCustomSelectionActionModeCallback(callback);
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}
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private Object futureSelectionIdentifier;
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private int futureSelectionStart;
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private int futureSelectionEnd;
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public void onUpdate(TextView textView, Object identifier) {
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if (SUPPORTED) {
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final ActionMode.Callback callback = textView.getCustomSelectionActionModeCallback();
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if (callback instanceof CustomCallback) {
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final CustomCallback customCallback = (CustomCallback) textView.getCustomSelectionActionModeCallback();
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customCallback.identifier = identifier;
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if (futureSelectionIdentifier == identifier) {
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HANDLER.obtainMessage(MESSAGE_START_SELECTION, new StartSelectionHolder(this,
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textView, futureSelectionStart, futureSelectionEnd)).sendToTarget();
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}
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}
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}
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}
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public void onCreate(TextView textView, ActionMode.Callback additionalCallback) {
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final CustomCallback callback = new CustomCallback(textView, additionalCallback);
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textView.setCustomSelectionActionModeCallback(callback);
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}
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public void onBeforeNotifyDataSetChanged() {
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if (SUPPORTED) {
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HANDLER.removeMessages(MESSAGE_SEND_RESET);
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HANDLER.removeMessages(MESSAGE_RESET);
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HANDLER.removeMessages(MESSAGE_START_SELECTION);
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if (selectionActionMode != null) {
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final CharSequence text = selectionTextView.getText();
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futureSelectionIdentifier = selectionIdentifier;
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futureSelectionStart = Selection.getSelectionStart(text);
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futureSelectionEnd = Selection.getSelectionEnd(text);
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selectionActionMode.finish();
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selectionActionMode = null;
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selectionIdentifier = null;
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selectionTextView = null;
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}
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}
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}
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public void onUpdate(TextView textView, Object identifier) {
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if (SUPPORTED) {
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CustomCallback callback = (CustomCallback) textView.getCustomSelectionActionModeCallback();
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callback.identifier = identifier;
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if (futureSelectionIdentifier == identifier) {
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HANDLER.obtainMessage(MESSAGE_START_SELECTION, new StartSelectionHolder(this,
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textView, futureSelectionStart, futureSelectionEnd)).sendToTarget();
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}
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}
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}
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public void onAfterNotifyDataSetChanged() {
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if (SUPPORTED && futureSelectionIdentifier != null) {
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HANDLER.obtainMessage(MESSAGE_SEND_RESET, this).sendToTarget();
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}
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}
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public void onBeforeNotifyDataSetChanged() {
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if (SUPPORTED) {
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HANDLER.removeMessages(MESSAGE_SEND_RESET);
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HANDLER.removeMessages(MESSAGE_RESET);
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HANDLER.removeMessages(MESSAGE_START_SELECTION);
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if (selectionActionMode != null) {
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final CharSequence text = selectionTextView.getText();
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futureSelectionIdentifier = selectionIdentifier;
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futureSelectionStart = Selection.getSelectionStart(text);
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futureSelectionEnd = Selection.getSelectionEnd(text);
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selectionActionMode.finish();
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selectionActionMode = null;
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selectionIdentifier = null;
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selectionTextView = null;
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}
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}
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}
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private static class StartSelectionHolder {
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public void onAfterNotifyDataSetChanged() {
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if (SUPPORTED && futureSelectionIdentifier != null) {
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HANDLER.obtainMessage(MESSAGE_SEND_RESET, this).sendToTarget();
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}
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}
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final ListSelectionManager listSelectionManager;
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final TextView textView;
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public final int start;
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public final int end;
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private class CustomCallback implements ActionMode.Callback {
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StartSelectionHolder(ListSelectionManager listSelectionManager, TextView textView,
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int start, int end) {
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this.listSelectionManager = listSelectionManager;
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this.textView = textView;
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this.start = start;
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this.end = end;
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}
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}
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private final TextView textView;
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private final ActionMode.Callback additionalCallback;
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public Object identifier;
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private class CustomCallback implements ActionMode.Callback {
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public CustomCallback(TextView textView, ActionMode.Callback additionalCallback) {
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this.textView = textView;
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this.additionalCallback = additionalCallback;
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}
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private final TextView textView;
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private final ActionMode.Callback additionalCallback;
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Object identifier;
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@Override
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public boolean onCreateActionMode(ActionMode mode, Menu menu) {
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selectionActionMode = mode;
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selectionIdentifier = identifier;
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selectionTextView = textView;
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if (additionalCallback != null) {
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additionalCallback.onCreateActionMode(mode, menu);
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}
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return true;
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}
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CustomCallback(TextView textView, ActionMode.Callback additionalCallback) {
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this.textView = textView;
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this.additionalCallback = additionalCallback;
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}
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@Override
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public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
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if (additionalCallback != null) {
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additionalCallback.onPrepareActionMode(mode, menu);
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}
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return true;
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}
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@Override
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public boolean onCreateActionMode(ActionMode mode, Menu menu) {
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selectionActionMode = mode;
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selectionIdentifier = identifier;
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selectionTextView = textView;
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if (additionalCallback != null) {
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additionalCallback.onCreateActionMode(mode, menu);
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}
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return true;
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}
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@Override
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public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
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if (additionalCallback != null && additionalCallback.onActionItemClicked(mode, item)) {
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return true;
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}
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return false;
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}
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@Override
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public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
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if (additionalCallback != null) {
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additionalCallback.onPrepareActionMode(mode, menu);
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}
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return true;
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}
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@Override
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public void onDestroyActionMode(ActionMode mode) {
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if (additionalCallback != null) {
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additionalCallback.onDestroyActionMode(mode);
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}
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if (selectionActionMode == mode) {
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selectionActionMode = null;
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selectionIdentifier = null;
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selectionTextView = null;
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}
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}
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}
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@Override
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public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
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if (additionalCallback != null && additionalCallback.onActionItemClicked(mode, item)) {
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return true;
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}
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return false;
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}
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private static final Field FIELD_EDITOR;
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private static final Method METHOD_START_SELECTION;
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private static final boolean SUPPORTED;
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static {
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Field editor;
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try {
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editor = TextView.class.getDeclaredField("mEditor");
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editor.setAccessible(true);
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} catch (Exception e) {
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editor = null;
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}
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FIELD_EDITOR = editor;
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Method startSelection = null;
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if (editor != null) {
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String[] startSelectionNames = {"startSelectionActionMode", "startSelectionActionModeWithSelection"};
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for (String startSelectionName : startSelectionNames) {
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try {
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startSelection = editor.getType().getDeclaredMethod(startSelectionName);
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startSelection.setAccessible(true);
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break;
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} catch (Exception e) {
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startSelection = null;
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}
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}
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}
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METHOD_START_SELECTION = startSelection;
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SUPPORTED = FIELD_EDITOR != null && METHOD_START_SELECTION != null;
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}
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public static boolean isSupported() {
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return SUPPORTED;
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}
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public static void startSelection(TextView textView, int start, int end) {
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final CharSequence text = textView.getText();
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if (SUPPORTED && start >= 0 && end > start && textView.isTextSelectable() && text instanceof Spannable) {
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final Spannable spannable = (Spannable) text;
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start = Math.min(start, spannable.length());
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end = Math.min(end, spannable.length());
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Selection.setSelection(spannable, start, end);
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try {
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final Object editor = FIELD_EDITOR != null ? FIELD_EDITOR.get(textView) : textView;
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METHOD_START_SELECTION.invoke(editor);
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} catch (Exception e) {
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}
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}
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}
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@Override
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public void onDestroyActionMode(ActionMode mode) {
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if (additionalCallback != null) {
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additionalCallback.onDestroyActionMode(mode);
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}
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if (selectionActionMode == mode) {
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selectionActionMode = null;
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selectionIdentifier = null;
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selectionTextView = null;
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}
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}
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}
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}
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