Java tutorial
// Copyright (C) 2009 The Android Open Source Project // // 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.gerrit.client.ui; import com.google.gerrit.client.AvatarImage; import com.google.gerrit.client.FormatUtil; import com.google.gerrit.client.Gerrit; import com.google.gerrit.client.account.AccountInfo; import com.google.gwt.event.dom.client.BlurEvent; import com.google.gwt.event.dom.client.BlurHandler; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.event.dom.client.DoubleClickEvent; import com.google.gwt.event.dom.client.DoubleClickHandler; import com.google.gwt.event.dom.client.FocusEvent; import com.google.gwt.event.dom.client.FocusHandler; import com.google.gwt.event.dom.client.HasBlurHandlers; import com.google.gwt.event.dom.client.HasDoubleClickHandlers; import com.google.gwt.event.dom.client.HasFocusHandlers; import com.google.gwt.event.shared.HandlerManager; import com.google.gwt.event.shared.HandlerRegistration; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.Composite; import com.google.gwt.user.client.ui.FlexTable; import com.google.gwt.user.client.ui.FlowPanel; import com.google.gwt.user.client.ui.HTML; import com.google.gwt.user.client.ui.HTMLTable.CellFormatter; import com.google.gwt.user.client.ui.HasHorizontalAlignment; import com.google.gwt.user.client.ui.InlineLabel; import com.google.gwt.user.client.ui.Panel; import com.google.gwt.user.client.ui.Widget; import com.google.gwtexpui.safehtml.client.SafeHtml; import com.google.gwtexpui.safehtml.client.SafeHtmlBuilder; import java.util.Date; public class CommentPanel extends Composite implements HasDoubleClickHandlers, HasFocusHandlers, FocusHandler, HasBlurHandlers, BlurHandler { private static final int SUMMARY_LENGTH = 75; private final HandlerManager handlerManager = new HandlerManager(this); private final FlexTable header; private final InlineLabel messageSummary; private final FlowPanel content; private final DoubleClickHTML messageText; private CommentLinkProcessor commentLinkProcessor; private FlowPanel buttons; private boolean recent; public CommentPanel(final AccountInfo author, final Date when, String message, CommentLinkProcessor commentLinkProcessor) { this(commentLinkProcessor); setMessageText(message); setAuthorNameText(author, FormatUtil.name(author)); setDateText(FormatUtil.shortFormatDayTime(when)); final CellFormatter fmt = header.getCellFormatter(); fmt.getElement(0, 1).setTitle(FormatUtil.nameEmail(author)); fmt.getElement(0, 3).setTitle(FormatUtil.mediumFormat(when)); } protected CommentPanel(CommentLinkProcessor commentLinkProcessor) { this.commentLinkProcessor = commentLinkProcessor; final FlowPanel body = new FlowPanel(); initWidget(body); setStyleName(Gerrit.RESOURCES.css().commentPanel()); messageSummary = new InlineLabel(); messageSummary.setStyleName(Gerrit.RESOURCES.css().commentPanelSummary()); header = new FlexTable(); header.setStyleName(Gerrit.RESOURCES.css().commentPanelHeader()); header.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { setOpen(!isOpen()); } }); header.setText(0, 1, ""); header.setWidget(0, 2, messageSummary); header.setText(0, 3, ""); final CellFormatter fmt = header.getCellFormatter(); fmt.setStyleName(0, 1, Gerrit.RESOURCES.css().commentPanelAuthorCell()); fmt.setStyleName(0, 2, Gerrit.RESOURCES.css().commentPanelSummaryCell()); fmt.setStyleName(0, 3, Gerrit.RESOURCES.css().commentPanelDateCell()); fmt.setHorizontalAlignment(0, 3, HasHorizontalAlignment.ALIGN_RIGHT); body.add(header); content = new FlowPanel(); content.setStyleName(Gerrit.RESOURCES.css().commentPanelContent()); content.setVisible(false); body.add(content); messageText = new DoubleClickHTML(); messageText.setStyleName(Gerrit.RESOURCES.css().commentPanelMessage()); content.add(messageText); } @Override public HandlerRegistration addDoubleClickHandler(DoubleClickHandler handler) { return messageText.addDoubleClickHandler(handler); } protected void setMessageText(String message) { if (message == null) { message = ""; } else { message = message.trim(); } messageSummary.setText(summarize(message)); SafeHtml buf = new SafeHtmlBuilder().append(message).wikify(); buf = commentLinkProcessor.apply(buf); SafeHtml.set(messageText, buf); } public void setAuthorNameText(final AccountInfo author, final String nameText) { header.setWidget(0, 0, new AvatarImage(author, 26)); header.setText(0, 1, nameText); } protected void setDateText(final String dateText) { header.setText(0, 3, dateText); } protected void setMessageTextVisible(final boolean show) { messageText.setVisible(show); } protected void addContent(final Widget w) { if (buttons != null) { content.insert(w, content.getWidgetIndex(buttons)); } else { content.add(w); } } /** * Registers a {@link FocusHandler} for this comment panel. * The comment panel is considered as being focused whenever any button in the * comment panel gets focused. * * @param handler the focus handler to be registered */ @Override public HandlerRegistration addFocusHandler(final FocusHandler handler) { return handlerManager.addHandler(FocusEvent.getType(), handler); } /** * Registers a {@link BlurHandler} for this comment panel. * The comment panel is considered as being blurred whenever any button in the * comment panel gets blurred. * * @param handler the blur handler to be registered */ @Override public HandlerRegistration addBlurHandler(final BlurHandler handler) { return handlerManager.addHandler(BlurEvent.getType(), handler); } protected void addButton(final Button button) { // register focus and blur handler for each button, so that we can fire // focus and blur events for the comment panel button.addFocusHandler(this); button.addBlurHandler(this); getButtonPanel().add(button); } private Panel getButtonPanel() { if (buttons == null) { buttons = new FlowPanel(); buttons.setStyleName(Gerrit.RESOURCES.css().commentPanelButtons()); content.add(buttons); } return buttons; } @Override public void onFocus(final FocusEvent event) { // a button was focused -> fire focus event for the comment panel handlerManager.fireEvent(event); } @Override public void onBlur(final BlurEvent event) { // a button was blurred -> fire blur event for the comment panel handlerManager.fireEvent(event); } public void enableButtons(final boolean on) { for (Widget w : getButtonPanel()) { if (w instanceof Button) { ((Button) w).setEnabled(on); } } } private static String summarize(final String message) { if (message.length() < SUMMARY_LENGTH) { return message; } int p = 0; final StringBuilder r = new StringBuilder(); while (r.length() < SUMMARY_LENGTH) { final int e = message.indexOf(' ', p); if (e < 0) { break; } final String word = message.substring(p, e).trim(); if (SUMMARY_LENGTH <= r.length() + word.length() + 1) { break; } if (r.length() > 0) { r.append(' '); } r.append(word); p = e + 1; } r.append(" \u2026"); return r.toString(); } public boolean isOpen() { return content.isVisible(); } public void setOpen(final boolean open) { messageSummary.setVisible(!open); content.setVisible(open); } public boolean isRecent() { return recent; } public void setRecent(final boolean r) { recent = r; } private static class DoubleClickHTML extends HTML implements HasDoubleClickHandlers { public HandlerRegistration addDoubleClickHandler(DoubleClickHandler handler) { return addDomHandler(handler, DoubleClickEvent.getType()); } } }