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// Copyright (C) 2011 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gerrit.client.ui;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.user.client.ui.TabPanel;
import com.google.gwt.user.client.ui.Widget;
import java.util.ArrayList;
import java.util.List;
/** A TabPanel which allows entries to be hidden. This class is not yet
* designed to handle removes or any other add methods than the one
* overridden here. It is also not designed to handle anything other
* than text for the tab.
*/
public class MorphingTabPanel extends TabPanel {
// Keep track of the order the widgets/texts should be in when not hidden.
private List<Widget> widgets = new ArrayList<Widget>();
private List<String> texts = new ArrayList<String>();
// currently visible widgets
private List<Widget> visibles = new ArrayList<Widget>();
private int selection;
public MorphingTabPanel() {
addSelectionHandler(new SelectionHandler<Integer>() {
@Override
public void onSelection(SelectionEvent<Integer> ev) {
selection = ev.getSelectedItem();
}
});
}
public int getSelectedIndex() {
return selection;
}
public Widget getSelectedWidget() {
return getWidget(getSelectedIndex());
}
@Override
public void clear() {
super.clear();
widgets.clear();
texts.clear();
visibles.clear();
}
@Override
public void add(Widget w, String tabText) {
addInvisible(w, tabText);
visibles.add(w);
super.add(w, tabText);
}
public void addInvisible(Widget w, String tabText) {
widgets.add(w);
texts.add(tabText);
}
public void setVisible(Widget w, boolean visible) {
if (visible) {
if (visibles.indexOf(w) == -1) {
int origPos = widgets.indexOf(w);
/* Re-insert the widget right after the first visible widget found
when scanning backwards from the current widget */
for (int pos = origPos -1; pos >=0 ; pos--) {
int visiblePos = visibles.indexOf(widgets.get(pos));
if (visiblePos != -1) {
visibles.add(visiblePos + 1, w);
insert(w, texts.get(origPos), visiblePos + 1);
break;
}
}
}
} else {
int i = visibles.indexOf(w);
if (i != -1) {
visibles.remove(i);
remove(i);
}
}
}
}
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