/*
* Copyright 2000-2014 Vaadin Ltd.
*
* 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 com.vaadin.client.ui;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
import com.google.gwt.dom.client.DivElement;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.FormElement;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.ui.FileUpload;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.Hidden;
import com.google.gwt.user.client.ui.Panel;
import com.google.gwt.user.client.ui.SimplePanel;
import com.vaadin.client.ApplicationConnection;
import com.vaadin.client.BrowserInfo;
import com.vaadin.client.VConsole;
import com.vaadin.client.ui.upload.UploadIFrameOnloadStrategy;
/**
*
* Note, we are not using GWT FormPanel as we want to listen submitcomplete
* events even though the upload component is already detached.
*
*/
public class VUpload extends SimplePanel {
private final class MyFileUpload extends FileUpload {
@Override
public void onBrowserEvent(Event event) {
super.onBrowserEvent(event);
if (event.getTypeInt() == Event.ONCHANGE) {
if (immediate && fu.getFilename() != null
&& !"".equals(fu.getFilename())) {
submit();
}
} else if (BrowserInfo.get().isIE()
&& event.getTypeInt() == Event.ONFOCUS) {
// IE and user has clicked on hidden textarea part of upload
// field. Manually open file selector, other browsers do it by
// default.
fireNativeClick(fu.getElement());
// also remove focus to enable hack if user presses cancel
// button
fireNativeBlur(fu.getElement());
}
}
}
public static final String CLASSNAME = "v-upload";
/**
* FileUpload component that opens native OS dialog to select file.
* <p>
* For internal use only. May be removed or replaced in the future.
*/
public FileUpload fu = new MyFileUpload();
Panel panel = new FlowPanel();
UploadIFrameOnloadStrategy onloadstrategy = GWT
.create(UploadIFrameOnloadStrategy.class);
/** For internal use only. May be removed or replaced in the future. */
public ApplicationConnection client;
/** For internal use only. May be removed or replaced in the future. */
public String paintableId;
/**
* Button that initiates uploading.
* <p>
* For internal use only. May be removed or replaced in the future.
*/
public final VButton submitButton;
/**
* When expecting big files, programmer may initiate some UI changes when
* uploading the file starts. Bit after submitting file we'll visit the
* server to check possible changes.
* <p>
* For internal use only. May be removed or replaced in the future.
*/
public Timer t;
/**
* some browsers tries to send form twice if submit is called in button
* click handler, some don't submit at all without it, so we need to track
* if form is already being submitted
*/
private boolean submitted = false;
private boolean enabled = true;
private boolean immediate;
private Hidden maxfilesize = new Hidden();
/** For internal use only. May be removed or replaced in the future. */
public FormElement element;
private com.google.gwt.dom.client.Element synthesizedFrame;
/** For internal use only. May be removed or replaced in the future. */
public int nextUploadId;
public VUpload() {
super(com.google.gwt.dom.client.Document.get().createFormElement());
element = getElement().cast();
setEncoding(getElement(), FormPanel.ENCODING_MULTIPART);
element.setMethod(FormPanel.METHOD_POST);
setWidget(panel);
panel.add(maxfilesize);
panel.add(fu);
submitButton = new VButton();
submitButton.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
if (immediate) {
// fire click on upload (eg. focused button and hit space)
fireNativeClick(fu.getElement());
} else {
submit();
}
}
});
panel.add(submitButton);
setStyleName(CLASSNAME);
}
private static native void setEncoding(Element form, String encoding)
/*-{
form.enctype = encoding;
// For IE8
form.encoding = encoding;
}-*/;
/** For internal use only. May be removed or replaced in the future. */
public void setImmediate(boolean booleanAttribute) {
if (immediate != booleanAttribute) {
immediate = booleanAttribute;
if (immediate) {
fu.sinkEvents(Event.ONCHANGE);
fu.sinkEvents(Event.ONFOCUS);
}
}
setStyleName(getElement(), CLASSNAME + "-immediate", immediate);
}
private static native void fireNativeClick(Element element)
/*-{
element.click();
}-*/;
private static native void fireNativeBlur(Element element)
/*-{
element.blur();
}-*/;
/** For internal use only. May be removed or replaced in the future. */
public void disableUpload() {
setEnabledForSubmitButton(false);
if (!submitted) {
// Cannot disable the fileupload while submitting or the file won't
// be submitted at all
fu.getElement().setPropertyBoolean("disabled", true);
}
enabled = false;
}
/** For internal use only. May be removed or replaced in the future. */
public void enableUpload() {
setEnabledForSubmitButton(true);
fu.getElement().setPropertyBoolean("disabled", false);
enabled = true;
if (submitted) {
/*
* An old request is still in progress (most likely cancelled),
* ditching that target frame to make it possible to send a new
* file. A new target frame is created later."
*/
cleanTargetFrame();
submitted = false;
}
}
private void setEnabledForSubmitButton(boolean enabled) {
submitButton.setEnabled(enabled);
submitButton.setStyleName(ApplicationConnection.DISABLED_CLASSNAME,
!enabled);
}
/**
* Re-creates file input field and populates panel. This is needed as we
* want to clear existing values from our current file input field.
*/
private void rebuildPanel() {
panel.remove(submitButton);
panel.remove(fu);
fu = new MyFileUpload();
fu.setName(paintableId + "_file");
fu.getElement().setPropertyBoolean("disabled", !enabled);
panel.add(fu);
panel.add(submitButton);
if (immediate) {
fu.sinkEvents(Event.ONCHANGE);
}
}
/**
* Called by JSNI (hooked via {@link #onloadstrategy})
*/
private void onSubmitComplete() {
/* Needs to be run dereferred to avoid various browser issues. */
Scheduler.get().scheduleDeferred(new Command() {
@Override
public void execute() {
if (submitted) {
if (client != null) {
if (t != null) {
t.cancel();
}
VConsole.log("VUpload:Submit complete");
client.sendPendingVariableChanges();
}
rebuildPanel();
submitted = false;
enableUpload();
if (!isAttached()) {
/*
* Upload is complete when upload is already abandoned.
*/
cleanTargetFrame();
}
}
}
});
}
ScheduledCommand startUploadCmd = new ScheduledCommand() {
@Override
public void execute() {
element.submit();
submitted = true;
disableUpload();
/*
* Visit server a moment after upload has started to see possible
* changes from UploadStarted event. Will be cleared on complete.
*
* Must get the id here as the upload can finish before the timer
* expires and in that case nextUploadId has been updated and is
* wrong.
*/
final int thisUploadId = nextUploadId;
t = new Timer() {
@Override
public void run() {
// Only visit the server if the upload has not already
// finished
if (thisUploadId == nextUploadId) {
VConsole.log("Visiting server to see if upload started event changed UI.");
client.updateVariable(paintableId, "pollForStart",
thisUploadId, true);
}
}
};
t.schedule(800);
}
};
/** For internal use only. May be removed or replaced in the future. */
public void submit() {
if (submitted || !enabled) {
VConsole.log("Submit cancelled (disabled or already submitted)");
return;
}
if (fu.getFilename().length() == 0) {
VConsole.log("Submitting empty selection (no file)");
}
// flush possibly pending variable changes, so they will be handled
// before upload
client.sendPendingVariableChanges();
// This is done as deferred because sendPendingVariableChanges is also
// deferred and we want to start the upload only after the changes have
// been sent to the server
Scheduler.get().scheduleDeferred(startUploadCmd);
}
/** For internal use only. May be removed or replaced in the future. */
public void disableTitle(boolean disable) {
if (disable) {
// Disable title attribute for upload element.
if (BrowserInfo.get().isChrome()) {
// In Chrome title has to be set to " " to make it invisible
fu.setTitle(" ");
} else if (BrowserInfo.get().isFirefox()) {
// In FF title has to be set to empty string to make it
// invisible
// Method setTitle removes title attribute when it's an empty
// string, so setAttribute() should be used here
fu.getElement().setAttribute("title", "");
}
// For other browsers absent title doesn't show default tooltip for
// input element
} else {
fu.setTitle(null);
}
}
@Override
protected void onAttach() {
super.onAttach();
if (client != null) {
ensureTargetFrame();
}
}
/** For internal use only. May be removed or replaced in the future. */
public void ensureTargetFrame() {
if (synthesizedFrame == null) {
// Attach a hidden IFrame to the form. This is the target iframe to
// which the form will be submitted. We have to create the iframe
// using innerHTML, because setting an iframe's 'name' property
// dynamically doesn't work on most browsers.
DivElement dummy = Document.get().createDivElement();
dummy.setInnerHTML("<iframe src=\"javascript:''\" name='"
+ getFrameName()
+ "' style='position:absolute;width:0;height:0;border:0'>");
synthesizedFrame = dummy.getFirstChildElement();
Document.get().getBody().appendChild(synthesizedFrame);
element.setTarget(getFrameName());
onloadstrategy.hookEvents(synthesizedFrame, this);
}
}
private String getFrameName() {
return paintableId + "_TGT_FRAME";
}
@Override
protected void onDetach() {
super.onDetach();
if (!submitted) {
cleanTargetFrame();
}
}
private void cleanTargetFrame() {
if (synthesizedFrame != null) {
Document.get().getBody().removeChild(synthesizedFrame);
onloadstrategy.unHookEvents(synthesizedFrame);
synthesizedFrame = null;
}
}
}