org.kaaproject.kaa.sandbox.web.client.mvp.view.widget.ActionsLabel.java Source code

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Here is the source code for org.kaaproject.kaa.sandbox.web.client.mvp.view.widget.ActionsLabel.java

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/**
 *  Copyright 2014-2016 CyberVision, Inc.
 *
 *  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 org.kaaproject.kaa.sandbox.web.client.mvp.view.widget;

import org.kaaproject.kaa.sandbox.web.client.util.Utils;

import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.logical.shared.CloseEvent;
import com.google.gwt.event.logical.shared.CloseHandler;
import com.google.gwt.resources.client.ImageResource;
import com.google.gwt.safecss.shared.SafeStyles;
import com.google.gwt.safecss.shared.SafeStylesBuilder;
import com.google.gwt.safecss.shared.SafeStylesUtils;
import com.google.gwt.safehtml.client.SafeHtmlTemplates;
import com.google.gwt.safehtml.client.SafeHtmlTemplates.Template;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeUri;
import com.google.gwt.uibinder.client.UiConstructor;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.MenuBar;
import com.google.gwt.user.client.ui.MenuItem;
import com.google.gwt.user.client.ui.PopupPanel;

public class ActionsLabel extends Label {

    private static Template template;
    private PopupPanel actionsPopup;

    private MenuBar menu = new MenuBar(true);

    interface Template extends SafeHtmlTemplates {
        @Template("<div tabindex=\"0\" style=\"vertical-align:middle;\">" + "<span style='{0}'></span>"
                + "<span>{1}</span>" + "</div>")
        SafeHtml menuImageItemContent(SafeStyles style, String text);

        @Template("<div tabindex=\"0\" style=\"vertical-align:middle;\">" + "<span>{0}</span>" + "</div>")
        SafeHtml menuItemContent(String text);

    }

    @UiConstructor
    public ActionsLabel(String text, boolean hasPopup) {
        super();
        if (template == null) {
            template = GWT.create(Template.class);
        }
        Element textElement = DOM.createElement("span");
        textElement.setInnerText(text);
        DOM.insertChild(getElement(), textElement, 0);

        if (hasPopup) {
            if (text != null && text.length() > 0) {
                textElement.addClassName(Utils.sandboxStyle.caret());
            }
            actionsPopup = new PopupPanel(true, false);
            actionsPopup.addStyleName(Utils.sandboxStyle.actionPopup());
            actionsPopup.setWidget(menu);
            actionsPopup.addCloseHandler(new CloseHandler<PopupPanel>() {
                @Override
                public void onClose(CloseEvent<PopupPanel> event) {
                    // ActionsLabel.this.setDown(false);
                }
            });

            actionsPopup.addAutoHidePartner(getElement());

            addClickHandler(new ClickHandler() {
                public void onClick(ClickEvent event) {
                    if (!actionsPopup.isShowing()) {
                        // Instantiate the popup and show it.
                        final Element parent = ActionsLabel.this.getElement();
                        actionsPopup.setPopupPositionAndShow(new PopupPanel.PositionCallback() {
                            public void setPosition(int offsetWidth, int offsetHeight) {
                                int left = parent.getAbsoluteLeft();
                                int top = parent.getAbsoluteTop() + parent.getOffsetHeight() + 2;
                                if (left + actionsPopup.getOffsetWidth() > Window.getClientWidth()) {
                                    left = parent.getAbsoluteRight() - actionsPopup.getOffsetWidth();
                                }
                                actionsPopup.setPopupPosition(left, top);
                            }
                        });
                    } else {
                        actionsPopup.hide();
                    }
                }
            });
        }
    }

    public void addMenuItem(String text, final ActionMenuItemListener listener) {
        addMenuItem(null, text, listener);
    }

    public void addMenuItem(ImageResource image, String text, final ActionMenuItemListener listener) {

        SafeHtml html = null;
        if (image != null) {
            SafeUri uri = image.getSafeUri();
            int left = image.getLeft();
            int top = image.getTop();
            int width = image.getWidth();
            int height = image.getHeight();
            int paddingRight = width + 8;

            String background = "url(\"" + uri.asString() + "\") no-repeat " + (-left + "px ") + (-top + "px");

            SafeStylesBuilder builder = new SafeStylesBuilder();
            builder.trustedNameAndValue("background", background).width(width, Unit.PX).height(height, Unit.PX)
                    .paddingRight(paddingRight, Unit.PX);

            SafeStyles style = SafeStylesUtils.fromTrustedString(builder.toSafeStyles().asString());

            html = template.menuImageItemContent(style, text);
        } else {
            html = template.menuItemContent(text);
        }
        MenuItem item = new MenuItem(html, new Command() {

            @Override
            public void execute() {
                if (actionsPopup != null && actionsPopup.isVisible())
                    actionsPopup.hide();
                listener.onMenuItemSelected();
            }

        });

        menu.addItem(item);
    }

    public void clearItems() {
        menu.clearItems();
    }

    public static interface ActionMenuItemListener {
        void onMenuItemSelected();
    }
}