com.google.gerrit.client.ui.MorphingTabPanel.java Source code

Introduction

Here is the source code for com.google.gerrit.client.ui.MorphingTabPanel.java

Source

// 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);
            }
        }
    }
}