com.qualogy.qafe.gwt.client.component.QChoiceHelper.java Source code

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Here is the source code for com.qualogy.qafe.gwt.client.component.QChoiceHelper.java

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/**
 * Copyright 2008-2015 Qualogy Solutions B.V.
 *
 * 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.qualogy.qafe.gwt.client.component;

import java.util.ArrayList;
import java.util.List;

import com.google.gwt.event.logical.shared.HasValueChangeHandlers;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.user.client.ui.ComplexPanel;
import com.google.gwt.user.client.ui.HasEnabled;
import com.google.gwt.user.client.ui.HasText;
import com.google.gwt.user.client.ui.UIObject;
import com.google.gwt.user.client.ui.Widget;

public class QChoiceHelper {

    private UIObject uiObject;
    private List<DataChangeHandler> dataChangeHandlers = new ArrayList<DataChangeHandler>();
    private boolean enabled;

    public QChoiceHelper(UIObject uiObject) {
        this.uiObject = uiObject;
    }

    public boolean isEnabled() {
        return enabled;
    }

    public void setEnabled(boolean enabled) {
        this.enabled = enabled;
        List<Widget> items = getItems();
        if (items == null) {
            return;
        }
        for (Widget item : items) {
            if (item instanceof HasEnabled) {
                HasEnabled hasEnabled = (HasEnabled) item;
                hasEnabled.setEnabled(enabled);
            }
        }
    }

    public Object getData() {
        List<Widget> items = getItems();
        if (items != null) {
            for (Widget item : items) {
                if (item instanceof QRadioButton) {
                    QRadioButton radioButton = (QRadioButton) item;
                    if (radioButton.getValue()) {
                        return radioButton.getText();
                    }
                }
            }
        }
        return null;
    }

    public void addDataChangeHandler(DataChangeHandler handler) {
        if (handler instanceof DataChangeHandler) {
            dataChangeHandlers.add(handler);
        }
    }

    public boolean removeDataChangeHandler(DataChangeHandler handler) {
        return dataChangeHandlers.remove(handler);
    }

    public void registerItemValueChangeHandler(final Widget item) {
        if (item instanceof HasValueChangeHandlers) {
            HasValueChangeHandlers<Boolean> hasValueChangeHandlers = (HasValueChangeHandlers<Boolean>) item;
            hasValueChangeHandlers.addValueChangeHandler(new ValueChangeHandler<Boolean>() {
                public void onValueChange(ValueChangeEvent<Boolean> event) {
                    doItemValueChange(event);
                }
            });
        }
    }

    private void doItemValueChange(ValueChangeEvent<Boolean> event) {
        Object value = event.getValue();
        UIObject source = (UIObject) event.getSource();
        if (source instanceof HasText) {
            value = ((HasText) source).getText();
        }
        fireDataChange(uiObject, null, value);
    }

    private void fireDataChange(UIObject ui, Object oldValue, Object newValue) {
        for (DataChangeHandler handler : dataChangeHandlers) {
            handler.onDataChange(ui, oldValue, newValue);
        }
    }

    private List<Widget> getItems() {
        List<Widget> items = new ArrayList<Widget>();
        if (uiObject instanceof ComplexPanel) {
            ComplexPanel complexPanel = (ComplexPanel) uiObject;
            int numItems = complexPanel.getWidgetCount();
            for (int i = 0; i < numItems; i++) {
                Widget item = complexPanel.getWidget(i);
                items.add(item);
            }
        }
        return items;
    }
}