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Vaadin is a web application framework for Rich Internet Applications (RIA).
Vaadin enables easy development and maintenance of fast and
secure rich web
applications with a stunning look and feel and a wide browser support.
It features a server-side architecture with the majority of the logic
running
on the server. Ajax technology is used at the browser-side to ensure a
rich
and interactive user experience.
/*
* Copyright 2010 Google Inc.
*
* 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.google.gwt.cell.client;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.BrowserEvents;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.InputElement;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.safehtml.client.SafeHtmlTemplates;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.google.gwt.text.shared.SafeHtmlRenderer;
/**
* An {@link AbstractCell} used to render a text input.
*/
public class TextInputCell extends
AbstractInputCell {
interface Template extends SafeHtmlTemplates {
@Template("")
SafeHtml input(String value);
}
/**
* The {@code ViewData} for this cell.
*/
public static class ViewData {
/**
* The last value that was updated.
*/
private String lastValue;
/**
* The current value.
*/
private String curValue;
/**
* Construct a ViewData instance containing a given value.
*
* @param value a String value
*/
public ViewData(String value) {
this.lastValue = value;
this.curValue = value;
}
/**
* Return true if the last and current values of this ViewData object
* are equal to those of the other object.
*/
@Override
public boolean equals(Object other) {
if (!(other instanceof ViewData)) {
return false;
}
ViewData vd = (ViewData) other;
return equalsOrNull(lastValue, vd.lastValue)
&& equalsOrNull(curValue, vd.curValue);
}
/**
* Return the current value of the input element.
*
* @return the current value String
* @see #setCurrentValue(String)
*/
public String getCurrentValue() {
return curValue;
}
/**
* Return the last value sent to the {@link ValueUpdater}.
*
* @return the last value String
* @see #setLastValue(String)
*/
public String getLastValue() {
return lastValue;
}
/**
* Return a hash code based on the last and current values.
*/
@Override
public int hashCode() {
return (lastValue + "_*!@HASH_SEPARATOR@!*_" + curValue).hashCode();
}
/**
* Set the current value.
*
* @param curValue the current value
* @see #getCurrentValue()
*/
protected void setCurrentValue(String curValue) {
this.curValue = curValue;
}
/**
* Set the last value.
*
* @param lastValue the last value
* @see #getLastValue()
*/
protected void setLastValue(String lastValue) {
this.lastValue = lastValue;
}
private boolean equalsOrNull(Object a, Object b) {
return (a != null) ? a.equals(b) : ((b == null) ? true : false);
}
}
private static Template template;
/**
* Constructs a TextInputCell that renders its text without HTML markup.
*/
public TextInputCell() {
super(BrowserEvents.CHANGE, BrowserEvents.KEYUP);
if (template == null) {
template = GWT.create(Template.class);
}
}
/**
* Constructs a TextInputCell that renders its text using the given
* {@link SafeHtmlRenderer}.
*
* @param renderer parameter is ignored
* @deprecated the value of a text input is never treated as html
*/
@Deprecated
public TextInputCell(SafeHtmlRenderer renderer) {
this();
}
@Override
public void onBrowserEvent(Context context, Element parent, String value,
NativeEvent event, ValueUpdater valueUpdater) {
super.onBrowserEvent(context, parent, value, event, valueUpdater);
// Ignore events that don't target the input.
InputElement input = getInputElement(parent);
Element target = event.getEventTarget().cast();
if (!input.isOrHasChild(target)) {
return;
}
String eventType = event.getType();
Object key = context.getKey();
if (BrowserEvents.CHANGE.equals(eventType)) {
finishEditing(parent, value, key, valueUpdater);
} else if (BrowserEvents.KEYUP.equals(eventType)) {
// Record keys as they are typed.
ViewData vd = getViewData(key);
if (vd == null) {
vd = new ViewData(value);
setViewData(key, vd);
}
vd.setCurrentValue(input.getValue());
}
}
@Override
public void render(Context context, String value, SafeHtmlBuilder sb) {
// Get the view data.
Object key = context.getKey();
ViewData viewData = getViewData(key);
if (viewData != null && viewData.getCurrentValue().equals(value)) {
clearViewData(key);
viewData = null;
}
String s = (viewData != null) ? viewData.getCurrentValue() : value;
if (s != null) {
sb.append(template.input(s));
} else {
sb.appendHtmlConstant("");
}
}
@Override
protected void finishEditing(Element parent, String value, Object key,
ValueUpdater valueUpdater) {
String newValue = getInputElement(parent).getValue();
// Get the view data.
ViewData vd = getViewData(key);
if (vd == null) {
vd = new ViewData(value);
setViewData(key, vd);
}
vd.setCurrentValue(newValue);
// Fire the value updater if the value has changed.
if (valueUpdater != null && !vd.getCurrentValue().equals(vd.getLastValue())) {
vd.setLastValue(newValue);
valueUpdater.update(newValue);
}
// Blur the element.
super.finishEditing(parent, newValue, key, valueUpdater);
}
@Override
protected InputElement getInputElement(Element parent) {
return super.getInputElement(parent). cast();
}
}