com.google.testing.testify.risk.frontend.client.view.widgets.ConstrainedParameterWidget.java Source code

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Here is the source code for com.google.testing.testify.risk.frontend.client.view.widgets.ConstrainedParameterWidget.java

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// Copyright 2010 Google Inc. All Rights Reseved.
//
// 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.testing.testify.risk.frontend.client.view.widgets;

import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.event.shared.HasHandlers;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HasVerticalAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.TextBox;

import java.util.List;

/**
 * Widget a constrained DataRequest parameter, where the key values are fixed.
 *
 * @author chrsmith@google.com (Chris Smith)
 */
public class ConstrainedParameterWidget extends Composite implements DataRequestParameterWidget {
    private final ListBox keyListBox = new ListBox();
    private final TextBox valueTextBox = new TextBox();
    private boolean isDeleted = false;
    private final Image removeParameterImage = new Image("/images/x.png");

    public ConstrainedParameterWidget(List<String> keyValues, String key, String value) {
        keyListBox.clear();
        for (String keyValue : keyValues) {
            keyListBox.addItem(keyValue);
        }

        int startingKeyIndex = -1;
        if (keyValues.contains(key)) {
            startingKeyIndex = keyValues.indexOf(key);
        } else {
            // Initialized with a key not in the key values? Likely a bug somewhere...
            startingKeyIndex = 0;
        }
        keyListBox.setSelectedIndex(startingKeyIndex);
        valueTextBox.setText(value);

        final HasHandlers self = this;
        removeParameterImage.addClickHandler(new ClickHandler() {
            @Override
            public void onClick(ClickEvent arg0) {
                isDeleted = true;
                fireChangeEvent();
            }
        });
        HorizontalPanel panel = new HorizontalPanel();
        panel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE);
        panel.addStyleName("tty-DataRequestParameter");
        panel.add(keyListBox);
        panel.add(valueTextBox);
        panel.add(removeParameterImage);
        initWidget(panel);
    }

    private void fireChangeEvent() {
        NativeEvent event = Document.get().createChangeEvent();
        ChangeEvent.fireNativeEvent(event, this);
    }

    @Override
    public String getParameterKey() {
        if (isDeleted) {
            return null;
        }
        int selectedIndex = keyListBox.getSelectedIndex();
        return keyListBox.getItemText(selectedIndex);
    }

    @Override
    public String getParameterValue() {
        if (isDeleted) {
            return null;
        }
        return valueTextBox.getText();
    }

    @Override
    public boolean isDeleted() {
        return isDeleted;
    }

    @Override
    public HandlerRegistration addChangeHandler(ChangeHandler handler) {
        return addHandler(handler, ChangeEvent.getType());
    }
}