Java tutorial
/* * Copyright 2014 Daniel Kurka * * 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.googlecode.mgwt.ui.client.widget.input; import com.google.gwt.core.client.Scheduler; import com.google.gwt.core.client.Scheduler.ScheduledCommand; import com.google.gwt.event.dom.client.BlurEvent; import com.google.gwt.event.dom.client.BlurHandler; import com.google.gwt.event.dom.client.FocusEvent; import com.google.gwt.event.dom.client.FocusHandler; import com.google.gwt.event.logical.shared.ValueChangeEvent; import com.google.gwt.event.shared.HandlerManager; import com.google.gwt.i18n.client.DateTimeFormat; import com.google.gwt.text.shared.Parser; import com.google.gwt.text.shared.Renderer; import com.google.gwt.user.client.DOM; import com.google.gwt.user.client.ui.ValueBoxBase; import com.googlecode.mgwt.ui.client.MGWT; import com.googlecode.mgwt.ui.client.widget.base.MValueBoxBase; import java.io.IOException; import java.text.ParseException; import java.util.Date; /** * A simple Date input widget. So far it uses <input type="date" /> on iOS with a nice looking * native date picker. * * On other platforms it displays the pattern to use for date input (no picker so far). * * <h2>Date format</h2> * * For iOS there is no need to set a dateformat, since the iOS will automatically display the date * formated according to the locale of the device, while we get the date in the W3C Format. * * On other platforms you can set the format to fit what you like. * * * * @author Daniel Kurka * */ public class MDateBox extends MValueBoxBase<Date> { private static final DateTimeFormat DEFAULT_FORMAT = DateTimeFormat.getFormat("dd/MM/yy"); private static final DateTimeFormat W3C_FORMAT = DateTimeFormat.getFormat("yyyy-MM-dd"); /** * Using ValueBoxBase as a base class for our input element. * * @author Daniel Kurka * */ private static class DateValueBoxBase extends ValueBoxBase<Date> implements HasSource { private final DateRenderer dateRenderer; private final DateParser dateParser; private Object source; protected DateValueBoxBase(DateRenderer dateRenderer, DateParser dateParser) { super(DOM.createInputText(), dateRenderer, dateParser); this.dateRenderer = dateRenderer; this.dateParser = dateParser; } public DateParser getDateParser() { return dateParser; } public DateRenderer getDateRenderer() { return dateRenderer; } @Override protected HandlerManager createHandlerManager() { return new HandlerManager(source); } public void setSource(Object source) { this.source = source; } } public static class DateRenderer implements Renderer<Date> { private DateTimeFormat format; public DateRenderer() { setFormat(DEFAULT_FORMAT); } public void setFormat(DateTimeFormat format) { this.format = format; } @Override public String render(Date object) { if (object == null) { return ""; } return format.format(object); } @Override public void render(Date object, Appendable appendable) throws IOException { if (object != null) { appendable.append(format.format(object)); } } } public static class DateParser implements Parser<Date> { public DateParser() { setFormat(DEFAULT_FORMAT); } private DateTimeFormat format; public void setFormat(DateTimeFormat format) { this.format = format; } @Override public Date parse(CharSequence text) throws ParseException { String string = text.toString(); try { return format.parse(string); } catch (Exception e) { return null; } } } private Date lastValue; private DateTimeFormat format; public MDateBox() { this(InputAppearanceHolder.DEFAULT_APPEARANCE); } public MDateBox(InputAppearance appearance) { super(appearance, new DateValueBoxBase(new DateRenderer(), new DateParser())); format = DEFAULT_FORMAT; setPlaceHolder(DEFAULT_FORMAT.getPattern()); addStyleName(appearance.css().textBox()); // fix ios issue with onchange event if (MGWT.getOsDetection().isAndroid4_4_OrHigher()) { // only set input type to date if there is a native picker impl.setType(box.getElement(), "date"); // use w3c format format = W3C_FORMAT; } if (MGWT.getOsDetection().isRetina()) { // IOS needs a workaround for empty date picker // Since it will not render them properly (iOS7) format = W3C_FORMAT; box.addFocusHandler(new FocusHandler() { @Override public void onFocus(FocusEvent event) { impl.setType(box.getElement(), "date"); } }); box.addBlurHandler(new BlurHandler() { @Override public void onBlur(BlurEvent event) { impl.setType(box.getElement(), "text"); } }); } if (MGWT.getOsDetection().isIPadRetina() || MGWT.getOsDetection().isIPad()) { // for iPad workaround does not work // adding default date, not happy about this impl.setType(box.getElement(), "date"); format = W3C_FORMAT; Scheduler.get().scheduleDeferred(new ScheduledCommand() { @Override public void execute() { box.setValue(new Date()); } }); } // apply format to parsers getBox().getDateParser().setFormat(format); getBox().getDateRenderer().setFormat(format); if (MGWT.getOsDetection().isIOs()) { addBlurHandler(new BlurHandler() { @Override public void onBlur(BlurEvent event) { Scheduler.get().scheduleDeferred(new ScheduledCommand() { @Override public void execute() { Date value = box.getValue(); ValueChangeEvent.fireIfNotEqual(box, lastValue, value); lastValue = value; } }); } }); lastValue = null; } } /** * set the format to use in the datebox. Important: This should only be set on non iOS devices, * since iOS handles locale on dates under the cover. * * See: {@link MDateBox} * * @param pattern */ public void setFormat(String pattern) { format = DateTimeFormat.getFormat(pattern); if (!MGWT.getOsDetection().isIOs() && !MGWT.getOsDetection().isAndroid4_4_OrHigher()) { setPlaceHolder(pattern); } getBox().getDateParser().setFormat(format); getBox().getDateRenderer().setFormat(format); } protected DateValueBoxBase getBox() { return (DateValueBoxBase) box; } }