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package de.danoeh.antennapod.adapter;
import android.app.Activity;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import androidx.recyclerview.widget.RecyclerView;
import de.danoeh.antennapod.R;
import java.util.HashSet;
/**
* Used by Recyclerviews that need to provide ability to select items.
*/
abstract class SelectableAdapter<T extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<T> {
private ActionMode actionMode;
private final HashSet<Long> selectedIds = new HashSet<>();
private final Activity activity;
private OnSelectModeListener onSelectModeListener;
public SelectableAdapter(Activity activity) {
this.activity = activity;
}
public void startSelectMode(int pos) {
if (inActionMode()) {
endSelectMode();
}
if (onSelectModeListener != null) {
onSelectModeListener.onStartSelectMode();
}
selectedIds.clear();
selectedIds.add(getItemId(pos));
notifyDataSetChanged();
actionMode = activity.startActionMode(new ActionMode.Callback() {
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.multi_select_options, menu);
return true;
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
updateTitle();
toggleSelectAllIcon(menu.findItem(R.id.select_toggle), false);
return false;
}
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
if (item.getItemId() == R.id.select_toggle) {
boolean allSelected = selectedIds.size() == getItemCount();
setSelected(0, getItemCount(), !allSelected);
toggleSelectAllIcon(item, !allSelected);
updateTitle();
return true;
}
return false;
}
@Override
public void onDestroyActionMode(ActionMode mode) {
callOnEndSelectMode();
actionMode = null;
selectedIds.clear();
notifyDataSetChanged();
}
});
updateTitle();
}
/**
* End action mode if currently in select mode, otherwise do nothing
*/
public void endSelectMode() {
if (inActionMode()) {
callOnEndSelectMode();
actionMode.finish();
}
}
public boolean isSelected(int pos) {
return selectedIds.contains(getItemId(pos));
}
/**
* Set the selected state of item at given position
*
* @param pos the position to select
* @param selected true for selected state and false for unselected
*/
public void setSelected(int pos, boolean selected) {
if (selected) {
selectedIds.add(getItemId(pos));
} else {
selectedIds.remove(getItemId(pos));
}
updateTitle();
}
/**
* Set the selected state of item for a given range
*
* @param startPos start position of range, inclusive
* @param endPos end position of range, inclusive
* @param selected indicates the selection state
* @throws IllegalArgumentException if start and end positions are not valid
*/
public void setSelected(int startPos, int endPos, boolean selected) throws IllegalArgumentException {
for (int i = startPos; i < endPos && i < getItemCount(); i++) {
setSelected(i, selected);
}
notifyItemRangeChanged(startPos, (endPos - startPos));
}
protected void toggleSelection(int pos) {
setSelected(pos, !isSelected(pos));
notifyItemChanged(pos);
if (selectedIds.size() == 0) {
endSelectMode();
}
}
public boolean inActionMode() {
return actionMode != null;
}
public int getSelectedCount() {
return selectedIds.size();
}
private void toggleSelectAllIcon(MenuItem selectAllItem, boolean allSelected) {
if (allSelected) {
selectAllItem.setIcon(R.drawable.ic_select_none);
selectAllItem.setTitle(R.string.deselect_all_label);
} else {
selectAllItem.setIcon(R.drawable.ic_select_all);
selectAllItem.setTitle(R.string.select_all_label);
}
}
private void updateTitle() {
if (actionMode == null) {
return;
}
actionMode.setTitle(activity.getResources()
.getQuantityString(R.plurals.num_selected_label, selectedIds.size(),
selectedIds.size(), getItemCount()));
}
public void setOnSelectModeListener(OnSelectModeListener onSelectModeListener) {
this.onSelectModeListener = onSelectModeListener;
}
private void callOnEndSelectMode() {
if (onSelectModeListener != null) {
onSelectModeListener.onEndSelectMode();
}
}
public interface OnSelectModeListener {
void onStartSelectMode();
void onEndSelectMode();
}
}
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