ImportFromDropboxDialog.java

package com.lushprojects.circuitjs1.client;

import java.util.Date;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.i18n.client.DateTimeFormat;
import com.google.gwt.user.client.ui.Anchor;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.DialogBox;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.TextArea;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.Window;

public class ImportFromDropboxDialog extends DialogBox {
	
		
	VerticalPanel vp;
	Button cancelButton;
	Button chooserButton;
	Button importButton;
	TextArea ta;
	Label la;
	HorizontalPanel hp;
	ImportFromDropbox importFromDropbox;
	static CirSim sim;
	
	
	static public void setSim(CirSim csim) {
		sim=csim;
	}
	
	static public void doLoadCallback(String s) {
		sim.pushUndo();
		sim.readSetup(s, true);
	}
	
	
	static public final native void doDropboxImport(String link)  /*-{
		try {
			var xhr= new XMLHttpRequest();
		  	xhr.addEventListener("load", function reqListener() { 
	//			console.log(xhr.responseText);
				var text = xhr.responseText;
	       		@com.lushprojects.circuitjs1.client.ImportFromDropboxDialog::doLoadCallback(Ljava/lang/String;)(text);
			});
			xhr.open("GET", link, false);
			xhr.send();
		}
		catch(err) {

		}

 	}-*/;

	static public void doImportDropboxLink(String link, Boolean validateIsDropbox) {
		if (validateIsDropbox && link.indexOf("https://www.dropbox.com/") != 0)
		{
			Window.alert("Dropbox links must start https://www.dropbox.com/");
			return;
		}
		// Work-around to allow CORS access to dropbox links - see
		// https://www.dropboxforum.com/t5/API-support/CORS-issue-when-trying-to-download-shared-file/m-p/82466
		link=link.replace("www.dropbox.com", "dl.dropboxusercontent.com");
		doDropboxImport(link);
			
	}

	public ImportFromDropboxDialog(CirSim csim) {
		super();
		setSim(csim);

		vp=new VerticalPanel();
		setWidget(vp);
		setText(sim.LS("Import from Dropbox"));
		if (ImportFromDropbox.isSupported()) {
			vp.add(new Label(sim.LS("To open a file in your dropbox account using the chooser click below.")));
			chooserButton = new Button(sim.LS("Open Dropbox Chooser"));
			vp.add(chooserButton);
			chooserButton.addClickHandler(new ClickHandler() {
				public void onClick(ClickEvent event) {
					closeDialog();
					importFromDropbox= new ImportFromDropbox(sim);
				}
			});
			la = new Label(sim.LS("To open a shared Dropbox file from a Dropbox link paste the link below..."));
		} else {
			vp.add(new Label("This site, or your browser doesn't support the Dropbox chooser so you can't pick a file from your dropbox account."));
			la = new Label("You can open a shared Dropbox file if you have a link. Paste the Dropbox link below...");
			la.setStyleName("topSpace");
		}
		
		vp.add(la);
		ta=new TextArea();
		ta.setWidth("300px");
		ta.setHeight("200px");
		vp.add(ta);
		hp = new HorizontalPanel();
		hp.setWidth("100%");
		vp.add(hp);
		hp.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_LEFT);
		importButton= new Button(sim.LS("Import From Dropbox Link"));
		importButton.addClickHandler(new ClickHandler() {
			public void onClick(ClickEvent event) {
				closeDialog();
				doImportDropboxLink(ta.getText(), true);
			}
		});
		hp.add(importButton);
		hp.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_RIGHT);
		cancelButton=new Button(sim.LS("Cancel"));
		hp.add(cancelButton);
		cancelButton.addClickHandler(new ClickHandler() {
			public void onClick(ClickEvent event) {
				closeDialog();
			}
		});
		this.center();
	}

	protected void closeDialog()
	{
		this.hide();
	}

}