FileUploadForm.java

package com.akjava.gwt.html5.client.file;

import java.util.ArrayList;
import java.util.List;

import com.akjava.gwt.html5.client.file.ui.DropVerticalPanelBase;
import com.google.common.base.Joiner;
import com.google.common.collect.Iterables;
import com.google.gwt.dom.client.Document;
import com.google.gwt.user.client.ui.FileUpload;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.Panel;

public class FileUploadForm extends FormPanel{
private FileUpload fileUpload;
private DropVerticalPanelBase dropPanel;
private boolean showDragOverBorder;

public static String ACCEPT_IMAGE_JPEG="image/jpeg";
public static String ACCEPT_IMAGE_PNG="image/png";
public static String ACCEPT_IMAGE_GIF="image/gif";
public static String ACCEPT_IMAGE="image/*";
public static String ACCEPT_AUDIO="audio/*";
public static String ACCEPT_VIDEO="video/*";
public static String ACCEPT_ZIP=".zip";
public static String ACCEPT_TXT=".txt";
public static String ACCEPT_JSON=".json";
public static String ACCEPT_CSV=".csv";
public static String ACCEPT_JAVASCRIPT=".js,.json";
public boolean isShowDragOverBorder() {
	return showDragOverBorder;
}

/**
 * show border when file dragging to detect which area is target.(default css-name is html5dragOverBorder)
 * @param showDragOverBorder
 */
public void setShowDragOverBorder(boolean showDragOverBorder) {
	this.showDragOverBorder = showDragOverBorder;
}

/**
 * don't add this directlly panel ,reset would not work
 * @return
 */
public FileUpload getFileUpload() {
	return fileUpload;
}

public void setFileUpload(FileUpload fileUpload) {
	this.fileUpload = fileUpload;
}

public void setEnabled(boolean bool){
	fileUpload.setEnabled(bool);
}

/**
 * set accept file like image/*
 * .zip
 * @param accept
 */
public FileUploadForm setAccept(String accept){
	fileUpload.getElement().setAttribute("accept", accept);
	return this;
}
public FileUploadForm setAccept(String... accepts){
	fileUpload.getElement().setAttribute("accept", Joiner.on(",").join(accepts));
	return this;
}

public FileUploadForm setAccept(List<String> accepts){
	fileUpload.getElement().setAttribute("accept", Joiner.on(",").join(accepts));
	return this;
}

public FileUploadForm insertTo(Panel panel){
	panel.add(this);
	return this;
}

public FileUploadForm(){
	super(Document.get().createFormElement(),false);
	fileUpload = new FileUpload();
	dropPanel = new DropVerticalPanelBase();
	dropPanel.setBorderWidth(0);
	add(dropPanel);
	dropPanel.add(fileUpload);
	dropPanel.setStylePrimaryName("html5dragOverBorder");
}

public void setMultiple(boolean bool){
	if(bool){
		fileUpload.getElement().setAttribute("multiple","multiple");
	}else{
		fileUpload.getElement().removeAttribute("multiple");
	}
}
public DropVerticalPanelBase getDropPanel(){
	return dropPanel;
}
@Override
public void setTitle(String title) {
	fileUpload.setTitle(title);
}

/*
 * basically accept start with . like .jpg.but this set only extension name for compatible others.
 */
public void setAcceptByExtension(List<String> supportExtensions) {
	List<String> accepts=new ArrayList<String>();
	for(String extension:supportExtensions){
		if(!extension.startsWith(".")){
			extension="."+extension;
		}
		if(!extension.isEmpty()){
			accepts.add(extension);
		}
	}
	setAccept(accepts);
}

}