com.sencha.gxt.dnd.core.client.Insert.java Source code

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Here is the source code for com.sencha.gxt.dnd.core.client.Insert.java

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/**
 * Sencha GXT 4.0.0 - Sencha for GWT
 * Copyright (c) 2006-2015, Sencha Inc.
 *
 * licensing@sencha.com
 * http://www.sencha.com/products/gxt/license/
 *
 * ================================================================================
 * Open Source License
 * ================================================================================
 * This version of Sencha GXT is licensed under the terms of the Open Source GPL v3
 * license. You may use this license only if you are prepared to distribute and
 * share the source code of your application under the GPL v3 license:
 * http://www.gnu.org/licenses/gpl.html
 *
 * If you are NOT prepared to distribute and share the source code of your
 * application under the GPL v3 license, other commercial and oem licenses
 * are available for an alternate download of Sencha GXT.
 *
 * Please see the Sencha GXT Licensing page at:
 * http://www.sencha.com/products/gxt/license/
 *
 * For clarification or additional options, please contact:
 * licensing@sencha.com
 * ================================================================================
 *
 *
 * ================================================================================
 * Disclaimer
 * ================================================================================
 * THIS SOFTWARE IS DISTRIBUTED "AS-IS" WITHOUT ANY WARRANTIES, CONDITIONS AND
 * REPRESENTATIONS WHETHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE
 * IMPLIED WARRANTIES AND CONDITIONS OF MERCHANTABILITY, MERCHANTABLE QUALITY,
 * FITNESS FOR A PARTICULAR PURPOSE, DURABILITY, NON-INFRINGEMENT, PERFORMANCE AND
 * THOSE ARISING BY STATUTE OR FROM CUSTOM OR USAGE OF TRADE OR COURSE OF DEALING.
 * ================================================================================
 */
package com.sencha.gxt.dnd.core.client;

import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.resources.client.ClientBundle;
import com.google.gwt.resources.client.CssResource;
import com.google.gwt.resources.client.ImageResource;
import com.google.gwt.resources.client.ImageResource.ImageOptions;
import com.google.gwt.resources.client.ImageResource.RepeatStyle;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.sencha.gxt.core.client.XTemplates;
import com.sencha.gxt.core.client.dom.XDOM;
import com.sencha.gxt.widget.core.client.Component;

/**
 * A custom widget used to show insert locations with drop targets.
 */
public class Insert extends Component {

    public static class DefaultInsertAppearance implements InsertAppearance {

        public interface InsertResources extends ClientBundle {

            ImageResource left();

            @ImageOptions(repeatStyle = RepeatStyle.Horizontal)
            ImageResource mid();

            ImageResource right();

            @Source("Insert.gss")
            InsertStyle style();

        }

        public interface InsertStyle extends CssResource {

            String bar();

            String left();

            String mid();

            String right();

        }

        public interface Template extends XTemplates {
            @XTemplate(source = "Insert.html")
            SafeHtml render(InsertStyle style);
        }

        private InsertStyle style;
        private Template template;

        public DefaultInsertAppearance() {
            this((InsertResources) GWT.create(InsertResources.class));
        }

        public DefaultInsertAppearance(InsertResources resources) {
            this.style = resources.style();
            this.style.ensureInjected();

            this.template = GWT.create(Template.class);
        }

        @Override
        public void render(SafeHtmlBuilder sb) {
            sb.append(template.render(style));
        }

    }

    public interface InsertAppearance {
        void render(SafeHtmlBuilder sb);
    }

    private final InsertAppearance appearance;
    private static final Insert instance = GWT.create(Insert.class);

    public static Insert get() {
        return instance;
    }

    protected Insert() {
        this(GWT.<InsertAppearance>create(InsertAppearance.class));
    }

    protected Insert(InsertAppearance appearance) {
        this.appearance = appearance;

        SafeHtmlBuilder sb = new SafeHtmlBuilder();
        appearance.render(sb);

        setElement((Element) XDOM.create(sb.toSafeHtml()));

        setShadow(false);
        hide();
    }

    public InsertAppearance getAppearance() {
        return appearance;
    }

    public void show(Element c) {
        c.insertBefore(getElement(), null);
        show();
    }

    @Override
    protected void onHide() {
        super.onHide();
        getElement().removeFromParent();
    }

    @Override
    protected void onShow() {
        super.onShow();
        if (!getElement().isConnected()) {
            Document.get().getBody().insertBefore(getElement(), null);
        }
    }

}