SplashDialog.java example

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geogebra-master
package org.geogebra.web.html5.gui;

import org.geogebra.common.GeoGebraConstants;
import org.geogebra.web.html5.css.GuiResourcesSimple;
import org.geogebra.web.html5.gui.util.NoDragImage;

import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Style;
import com.google.gwt.dom.client.Style.Position;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.SimplePanel;

public class SplashDialog extends SimplePanel {

	boolean appLoaded = false;
	boolean timerEllapsed = false;
	boolean isPreviewExists = false;
	private String articleId;

	private Timer t = new Timer() {
		@Override
		public void run() {
			if (appLoaded) {
				hide();
			}
			timerEllapsed = true;
		}
	};

	private final GeoGebraFrameW geogebraFrame;

	public SplashDialog(boolean showLogo, String articleId, GeoGebraFrameW frame) {
		this.articleId = articleId;
		this.geogebraFrame = frame;
		isPreviewExists = checkIfPreviewExists(articleId);

		if (!isPreviewExists) {
			FlowPanel panel = new FlowPanel();
			Style style = panel.getElement().getStyle();
			style.setPosition(Position.ABSOLUTE);
			style.setZIndex(1000000);
			style.setBackgroundColor("white");
			if (showLogo) {
				HTML logo = new HTML(GuiResourcesSimple.INSTANCE
				        .ggbSplashHtml().getText());
				panel.add(logo);
			}
			Image spinner = new NoDragImage(GuiResourcesSimple.INSTANCE
					.getGeoGebraWebSpinner().getSafeUri().asString());
			Style sstyle = spinner.getElement().getStyle();
			// position:absolute; margin-left:-8px; left:50%; bottom:5px;
			sstyle.setLeft(50, Unit.PCT);
			sstyle.setBottom(5, Unit.PX);
			sstyle.setPosition(Position.ABSOLUTE);
			sstyle.setMarginLeft(-8, Unit.PX);

			panel.add(spinner);
			addNativeLoadHandler(spinner.getElement());
			add(panel);
		} else {
			Timer afterConstructor = new Timer() {

				@Override
				public void run() {
					triggerImageLoaded();

				}
			};
			afterConstructor.schedule(0);
		}

		t.schedule(GeoGebraConstants.SPLASH_DIALOG_DELAY);
	}

	protected native void addNativeLoadHandler(Element img) /*-{
		var t = this;
		img.addEventListener("load", function() {
			t.@org.geogebra.web.html5.gui.SplashDialog::triggerImageLoaded()();
		});
	}-*/;

	private void triggerImageLoaded() {
		geogebraFrame.runAsyncAfterSplash();
	}

	private native boolean checkIfPreviewExists(String id) /*-{
		var thisArticle = $doc.getElementById(id);
		if (thisArticle && thisArticle.querySelector(".ggb_preview") !== null) {
			return true;
		}
		if (thisArticle
				&& thisArticle.parentElement
				&& thisArticle.parentElement.querySelector(".ggb_preview") !== null) {
			return true;
		}
		return false;
	}-*/;

	protected void hide() {
		this.removeFromParent();
		removePreviewImg(articleId);

	}

	private native void removePreviewImg(String id) /*-{
		var thisArticle = $doc.getElementById(id), img;
		if (thisArticle) {
			img = thisArticle.querySelector(".ggb_preview");
		}
		if (img) {
			img.parentNode.removeChild(img);
		}
	}-*/;

	public void canNowHide() {
		appLoaded = true;
		if (timerEllapsed) {
			hide();
		}
	}

	public boolean isPreviewExists() {
		return isPreviewExists;
	}

}