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/*
@VaadinApache2LicenseForJavaFiles@
*/
package com.vaadin.terminal.gwt.client.ui;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.MediaElement;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.ui.Widget;
import com.vaadin.terminal.gwt.client.ApplicationConnection;
import com.vaadin.terminal.gwt.client.Paintable;
import com.vaadin.terminal.gwt.client.UIDL;
import com.vaadin.terminal.gwt.client.Util;
public abstract class VMediaBase extends Widget implements Paintable {
public static final String ATTR_PAUSE = "pause";
public static final String ATTR_PLAY = "play";
public static final String ATTR_MUTED = "muted";
public static final String ATTR_CONTROLS = "ctrl";
public static final String ATTR_AUTOPLAY = "auto";
public static final String TAG_SOURCE = "src";
public static final String ATTR_RESOURCE = "res";
public static final String ATTR_RESOURCE_TYPE = "type";
public static final String ATTR_HTML = "html";
public static final String ATTR_ALT_TEXT = "alt";
private MediaElement media;
protected ApplicationConnection client;
/**
* Sets the MediaElement that is to receive all commands and properties.
*
* @param element
*/
public void setMediaElement(MediaElement element) {
setElement(element);
media = element;
}
public void updateFromUIDL(UIDL uidl, ApplicationConnection client) {
if (client.updateComponent(this, uidl, true)) {
return;
}
this.client = client;
media.setControls(shouldShowControls(uidl));
media.setAutoplay(shouldAutoplay(uidl));
media.setMuted(isMediaMuted(uidl));
// Add all sources
for (int ix = 0; ix < uidl.getChildCount(); ix++) {
UIDL child = uidl.getChildUIDL(ix);
if (TAG_SOURCE.equals(child.getTag())) {
Element src = Document.get().createElement("source").cast();
src.setAttribute("src", getSourceUrl(child));
src.setAttribute("type", getSourceType(child));
media.appendChild(src);
}
}
setAltText(uidl);
evalPauseCommand(uidl);
evalPlayCommand(uidl);
}
protected boolean shouldShowControls(UIDL uidl) {
return uidl.getBooleanAttribute(ATTR_CONTROLS);
}
private boolean shouldAutoplay(UIDL uidl) {
return uidl.getBooleanAttribute(ATTR_AUTOPLAY);
}
private boolean isMediaMuted(UIDL uidl) {
return uidl.getBooleanAttribute(ATTR_MUTED);
}
/**
* @param uidl
* @return the URL of a resource to be used as a source for the media
*/
private String getSourceUrl(UIDL uidl) {
String url = client.translateVaadinUri(uidl
.getStringAttribute(ATTR_RESOURCE));
if (url == null) {
return "";
}
return url;
}
/**
* @param uidl
* @return the mime type of the media
*/
private String getSourceType(UIDL uidl) {
return uidl.getStringAttribute(ATTR_RESOURCE_TYPE);
}
private void setAltText(UIDL uidl) {
String alt = uidl.getStringAttribute(ATTR_ALT_TEXT);
if (alt == null || "".equals(alt)) {
alt = getDefaultAltHtml();
} else if (!allowHtmlContent(uidl)) {
alt = Util.escapeHTML(alt);
}
media.appendChild(Document.get().createTextNode(alt));
}
private boolean allowHtmlContent(UIDL uidl) {
return uidl.getBooleanAttribute(ATTR_HTML);
}
private void evalPlayCommand(UIDL uidl) {
if (uidl.hasAttribute(ATTR_PLAY)) {
media.play();
}
}
private void evalPauseCommand(UIDL uidl) {
if (uidl.hasAttribute(ATTR_PAUSE)) {
media.pause();
}
}
/**
* @return the default HTML to show users with browsers that do not support
* HTML5 media markup.
*/
protected abstract String getDefaultAltHtml();
}
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