@Override
public void goBack() {
FragmentManager fragmentManager = getSupportFragmentManager();
if (mDisplayMode == DisplayMode.MESSAGE_VIEW) {
showMessageList();
} else if (fragmentManager.getBackStackEntryCount() > 0) {
fragmentManager.popBackStack();
} else if (mMessageListFragment.isManualSearch()) {
finish();
} else if (!mSingleFolderMode) {
onAccounts();
} else {
onShowFolderList();
}
}
/**
* Hide menu items not appropriate for the current context.
*
* <p><strong>Note:</strong> Please adjust the comments in {@code
* res/menu/message_list_option.xml} if you change the visibility of a menu item in this method.
*
* @param menu The {@link Menu} instance that should be modified. May be {@code null}; in that
* case the method does nothing and immediately returns.
*/
private void configureMenu(Menu menu) {
if (menu == null) {
return;
}
// Set visibility of account/folder settings menu items
if (mMessageListFragment == null) {
menu.findItem(R.id.account_settings).setVisible(false);
menu.findItem(R.id.folder_settings).setVisible(false);
} else {
menu.findItem(R.id.account_settings).setVisible(mMessageListFragment.isSingleAccountMode());
menu.findItem(R.id.folder_settings).setVisible(mMessageListFragment.isSingleFolderMode());
}
/*
* Set visibility of menu items related to the message view
*/
if (mDisplayMode == DisplayMode.MESSAGE_LIST
|| mMessageViewFragment == null
|| !mMessageViewFragment.isInitialized()) {
menu.findItem(R.id.next_message).setVisible(false);
menu.findItem(R.id.previous_message).setVisible(false);
menu.findItem(R.id.delete).setVisible(false);
menu.findItem(R.id.single_message_options).setVisible(false);
menu.findItem(R.id.refile).setVisible(false);
menu.findItem(R.id.toggle_unread).setVisible(false);
menu.findItem(R.id.select_text).setVisible(false);
menu.findItem(R.id.toggle_message_view_theme).setVisible(false);
menu.findItem(R.id.show_headers).setVisible(false);
menu.findItem(R.id.hide_headers).setVisible(false);
} else {
// hide prev/next buttons in split mode
if (mDisplayMode != DisplayMode.MESSAGE_VIEW) {
menu.findItem(R.id.next_message).setVisible(false);
menu.findItem(R.id.previous_message).setVisible(false);
} else {
MessageReference ref = mMessageViewFragment.getMessageReference();
boolean initialized =
(mMessageListFragment != null && mMessageListFragment.isLoadFinished());
boolean canDoPrev = (initialized && !mMessageListFragment.isFirst(ref));
boolean canDoNext = (initialized && !mMessageListFragment.isLast(ref));
MenuItem prev = menu.findItem(R.id.previous_message);
prev.setEnabled(canDoPrev);
prev.getIcon().setAlpha(canDoPrev ? 255 : 127);
MenuItem next = menu.findItem(R.id.next_message);
next.setEnabled(canDoNext);
next.getIcon().setAlpha(canDoNext ? 255 : 127);
}
MenuItem toggleTheme = menu.findItem(R.id.toggle_message_view_theme);
if (K9.useFixedMessageViewTheme()) {
toggleTheme.setVisible(false);
} else {
// Set title of menu item to switch to dark/light theme
if (K9.getK9MessageViewTheme() == K9.Theme.DARK) {
toggleTheme.setTitle(R.string.message_view_theme_action_light);
} else {
toggleTheme.setTitle(R.string.message_view_theme_action_dark);
}
toggleTheme.setVisible(true);
}
// Set title of menu item to toggle the read state of the currently displayed message
if (mMessageViewFragment.isMessageRead()) {
menu.findItem(R.id.toggle_unread).setTitle(R.string.mark_as_unread_action);
} else {
menu.findItem(R.id.toggle_unread).setTitle(R.string.mark_as_read_action);
}
menu.findItem(R.id.copy).setVisible(mMessageViewFragment.isCopyCapable());
// Jellybean has built-in long press selection support
menu.findItem(R.id.select_text).setVisible(Build.VERSION.SDK_INT < 16);
if (mMessageViewFragment.isMoveCapable()) {
menu.findItem(R.id.move).setVisible(true);
menu.findItem(R.id.archive).setVisible(mMessageViewFragment.canMessageBeArchived());
menu.findItem(R.id.spam).setVisible(mMessageViewFragment.canMessageBeMovedToSpam());
} else {
menu.findItem(R.id.move).setVisible(false);
menu.findItem(R.id.archive).setVisible(false);
menu.findItem(R.id.spam).setVisible(false);
}
if (mMessageViewFragment.allHeadersVisible()) {
menu.findItem(R.id.show_headers).setVisible(false);
} else {
menu.findItem(R.id.hide_headers).setVisible(false);
}
}
/*
* Set visibility of menu items related to the message list
*/
// Hide both search menu items by default and enable one when appropriate
menu.findItem(R.id.search).setVisible(false);
menu.findItem(R.id.search_remote).setVisible(false);
if (mDisplayMode == DisplayMode.MESSAGE_VIEW
|| mMessageListFragment == null
|| !mMessageListFragment.isInitialized()) {
menu.findItem(R.id.check_mail).setVisible(false);
menu.findItem(R.id.set_sort).setVisible(false);
menu.findItem(R.id.select_all).setVisible(false);
menu.findItem(R.id.send_messages).setVisible(false);
menu.findItem(R.id.expunge).setVisible(false);
} else {
menu.findItem(R.id.set_sort).setVisible(true);
menu.findItem(R.id.select_all).setVisible(true);
if (!mMessageListFragment.isSingleAccountMode()) {
menu.findItem(R.id.expunge).setVisible(false);
menu.findItem(R.id.check_mail).setVisible(false);
menu.findItem(R.id.send_messages).setVisible(false);
} else {
menu.findItem(R.id.send_messages).setVisible(mMessageListFragment.isOutbox());
if (mMessageListFragment.isRemoteFolder()) {
menu.findItem(R.id.check_mail).setVisible(true);
menu.findItem(R.id.expunge).setVisible(mMessageListFragment.isAccountExpungeCapable());
} else {
menu.findItem(R.id.check_mail).setVisible(false);
menu.findItem(R.id.expunge).setVisible(false);
}
}
// If this is an explicit local search, show the option to search on the server
if (!mMessageListFragment.isRemoteSearch() && mMessageListFragment.isRemoteSearchAllowed()) {
menu.findItem(R.id.search_remote).setVisible(true);
} else if (!mMessageListFragment.isManualSearch()) {
menu.findItem(R.id.search).setVisible(true);
}
}
}