com.seanchenxi.gwt.serenity.client.widget.PopupLabelBox.java Source code

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/*******************************************************************************
 * Copyright 2012 Xi CHEN
 *
 * 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.seanchenxi.gwt.serenity.client.widget;

import java.util.Iterator;

import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.logical.shared.HasSelectionHandlers;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.resources.client.ClientBundle;
import com.google.gwt.resources.client.CssResource;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.HasAlignment;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.ui.ScrollPanel;
import com.google.gwt.user.client.ui.Widget;

public class PopupLabelBox extends PopupPanel implements ClickHandler, HasSelectionHandlers<Label> {

    public interface Resources extends ClientBundle {

        public interface Style extends CssResource {
            final static String DEFAULT_CSS = "com/seanchenxi/gwt/serenity/client/resource/widget/PopupLabelBox.css";

            String popLabelBox();

            String popLabelBoxLabel();

            String selected();
        }

        @ClientBundle.Source(Style.DEFAULT_CSS)
        Style style();
    }

    private static Resources resources;

    private FlexTable table;
    private int row = 0, col = 0;
    private int columns;

    private Label selectedLabel;
    private String preSelection;

    public static Resources getResources() {
        if (resources == null) {
            resources = GWT.create(Resources.class);
            resources.style().ensureInjected();
        }
        return resources;
    }

    public PopupLabelBox(int columns) {
        super(true, true);
        this.columns = columns;
        this.table = new FlexTable();
        this.table.setSize("100%", "auto");
        setWidget(new ScrollPanel(table));
        setGlassEnabled(false);
        setAutoHideOnHistoryEventsEnabled(true);
        setStyleName(getResources().style().popLabelBox());
    }

    public void showRelativeTo(Widget w) {
        show();
        int top = w.getAbsoluteTop() - 20;
        int left = w.getAbsoluteLeft() + w.getOffsetWidth();
        setPopupPosition(left, top);
    }

    public void addLabel(String id, String text) {
        Label label = new Label(text);
        label.getElement().setId(id);
        label.setStyleName(getResources().style().popLabelBoxLabel());
        label.addClickHandler(this);
        table.setWidget(row, col, label);
        table.getCellFormatter().setVerticalAlignment(row, col, HasAlignment.ALIGN_MIDDLE);
        col++;
        if (col >= columns) {
            col = 0;
            row++;
        }
    }

    public Label findLabel(String id) {
        if (id == null || id.isEmpty())
            return null;
        for (Iterator<Widget> it = table.iterator(); it.hasNext();) {
            Widget w = it.next();
            if (w instanceof Label && ((Label) w).getElement().getId().equalsIgnoreCase(id)) {
                return (Label) w;
            }
        }
        return null;
    }

    public void clearSelection() {
        select(null);
    }

    public boolean select(Label label) {
        if (label == selectedLabel)
            return false;
        if (selectedLabel != null) {
            selectedLabel.removeStyleName(getResources().style().selected());
        }
        selectedLabel = label;
        if (selectedLabel != null) {
            selectedLabel.addStyleName(getResources().style().selected());
        }
        return true;
    }

    public String getSelectedLabel() {
        return selectedLabel == null ? null : selectedLabel.getElement().getId();
    }

    public void clearLabels() {
        selectedLabel = null;
        table.clear();
        row = 0;
        col = 0;
    }

    public void preSelectLabel(String slug) {
        preSelection = slug;
    }

    public String getPreSelection() {
        return preSelection;
    }

    @Override
    public void onClick(ClickEvent event) {
        final Object o = event.getSource();
        Scheduler.get().scheduleDeferred(new ScheduledCommand() {
            @Override
            public void execute() {
                if (o instanceof Label) {
                    fireSelectionEvent((Label) o);
                }
            }
        });
    }

    @Override
    public HandlerRegistration addSelectionHandler(SelectionHandler<Label> handler) {
        return addHandler(handler, SelectionEvent.getType());
    }

    @Override
    protected void onLoad() {
        super.onLoad();
    }

    private void fireSelectionEvent(final Label label) {
        if (select(label)) {
            SelectionEvent.fire(PopupLabelBox.this, label);
        }
    }
}