Java tutorial
// Copyright (C) 2013 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.diff; import com.google.gerrit.client.FormatUtil; import com.google.gerrit.client.change.LocalComments; import com.google.gerrit.client.changes.CommentApi; import com.google.gerrit.client.changes.CommentInfo; import com.google.gerrit.client.rpc.CallbackGroup; import com.google.gerrit.client.rpc.GerritCallback; import com.google.gerrit.client.rpc.RestApi; import com.google.gerrit.client.ui.CommentLinkProcessor; import com.google.gerrit.reviewdb.client.PatchSet; import com.google.gwt.core.client.GWT; import com.google.gwt.core.client.JavaScriptObject; import com.google.gwt.core.client.Scheduler; import com.google.gwt.core.client.Scheduler.ScheduledCommand; import com.google.gwt.dom.client.Element; import com.google.gwt.event.dom.client.BlurEvent; 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.KeyCodes; import com.google.gwt.event.dom.client.KeyDownEvent; import com.google.gwt.event.dom.client.MouseMoveEvent; import com.google.gwt.event.dom.client.MouseMoveHandler; import com.google.gwt.event.dom.client.MouseUpEvent; import com.google.gwt.event.dom.client.MouseUpHandler; import com.google.gwt.uibinder.client.UiBinder; import com.google.gwt.uibinder.client.UiField; import com.google.gwt.uibinder.client.UiHandler; import com.google.gwt.user.client.Timer; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.HTML; import com.google.gwt.user.client.ui.HTMLPanel; import com.google.gwt.user.client.ui.UIObject; import com.google.gwt.user.client.ui.Widget; import com.google.gwtexpui.globalkey.client.NpTextArea; import com.google.gwtexpui.safehtml.client.SafeHtmlBuilder; import net.codemirror.lib.CodeMirror; /** An HtmlPanel for displaying and editing a draft */ class DraftBox extends CommentBox { interface Binder extends UiBinder<HTMLPanel, DraftBox> { } private static final Binder uiBinder = GWT.create(Binder.class); private static final int INITIAL_LINES = 5; private static final int MAX_LINES = 30; private final CommentLinkProcessor linkProcessor; private final PatchSet.Id psId; private final boolean expandAll; private CommentInfo comment; private PublishedBox replyToBox; private Timer expandTimer; private Timer resizeTimer; private int editAreaHeight; private boolean autoClosed; private CallbackGroup pendingGroup; @UiField Widget header; @UiField Element summary; @UiField Element date; @UiField Element p_view; @UiField HTML message; @UiField Button edit; @UiField Button discard1; @UiField Element p_edit; @UiField NpTextArea editArea; @UiField Button save; @UiField Button cancel; @UiField Button discard2; DraftBox(CommentGroup group, CommentLinkProcessor clp, PatchSet.Id id, CommentInfo info, boolean expandAllComments) { super(group, info.range()); linkProcessor = clp; psId = id; expandAll = expandAllComments; initWidget(uiBinder.createAndBindUi(this)); expandTimer = new Timer() { @Override public void run() { expandText(); } }; set(info); header.addDomHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { if (!isEdit()) { if (autoClosed && !isOpen()) { setOpen(true); setEdit(true); } else { setOpen(!isOpen()); } } } }, ClickEvent.getType()); addDomHandler(new DoubleClickHandler() { @Override public void onDoubleClick(DoubleClickEvent event) { if (isEdit()) { editArea.setFocus(true); } else { setOpen(true); setEdit(true); } } }, DoubleClickEvent.getType()); initResizeHandler(); } private void set(CommentInfo info) { autoClosed = !expandAll && info.message() != null && info.message().length() < 70; date.setInnerText(FormatUtil.shortFormatDayTime(info.updated())); if (info.message() != null) { String msg = info.message().trim(); summary.setInnerText(msg); message.setHTML(linkProcessor.apply(new SafeHtmlBuilder().append(msg).wikify())); } comment = info; } @Override CommentInfo getCommentInfo() { return comment; } @Override boolean isOpen() { return UIObject.isVisible(p_view); } @Override void setOpen(boolean open) { UIObject.setVisible(summary, !open); UIObject.setVisible(p_view, open); super.setOpen(open); } private void expandText() { double cols = editArea.getCharacterWidth(); int rows = 2; for (String line : editArea.getValue().split("\n")) { rows += Math.ceil((1.0 + line.length()) / cols); } rows = Math.max(INITIAL_LINES, Math.min(rows, MAX_LINES)); if (editArea.getVisibleLines() != rows) { editArea.setVisibleLines(rows); } editAreaHeight = editArea.getOffsetHeight(); getCommentGroup().resize(); } boolean isEdit() { return UIObject.isVisible(p_edit); } void setEdit(boolean edit) { UIObject.setVisible(summary, false); UIObject.setVisible(p_view, !edit); UIObject.setVisible(p_edit, edit); setRangeHighlight(edit); if (edit) { String msg = comment.message() != null ? comment.message() : ""; editArea.setValue(msg); cancel.setVisible(!isNew()); expandText(); editAreaHeight = editArea.getOffsetHeight(); final int len = msg.length(); Scheduler.get().scheduleDeferred(new ScheduledCommand() { @Override public void execute() { editArea.setFocus(true); if (len > 0) { editArea.setCursorPos(len); } } }); } else { expandTimer.cancel(); resizeTimer.cancel(); } getCommentManager().setUnsaved(this, edit); getCommentGroup().resize(); } PublishedBox getReplyToBox() { return replyToBox; } void setReplyToBox(PublishedBox box) { replyToBox = box; } @Override protected void onUnload() { expandTimer.cancel(); resizeTimer.cancel(); super.onUnload(); } private void removeUI() { if (replyToBox != null) { replyToBox.unregisterReplyBox(); } getCommentManager().setUnsaved(this, false); setRangeHighlight(false); clearRange(); getAnnotation().remove(); getCommentGroup().remove(this); getCm().focus(); } private void restoreSelection() { if (getFromTo() != null && comment.inReplyTo() == null) { getCm().setSelection(getFromTo().from(), getFromTo().to()); } } @UiHandler("message") void onMessageClick(ClickEvent e) { e.stopPropagation(); } @UiHandler("message") void onMessageDoubleClick(@SuppressWarnings("unused") DoubleClickEvent e) { setEdit(true); } @UiHandler("edit") void onEdit(ClickEvent e) { e.stopPropagation(); setEdit(true); } @UiHandler("save") void onSave(ClickEvent e) { e.stopPropagation(); CallbackGroup group = new CallbackGroup(); save(group); group.done(); } void save(CallbackGroup group) { if (pendingGroup != null) { pendingGroup.addListener(group); return; } String message = editArea.getValue().trim(); if (message.length() == 0) { return; } CommentInfo input = CommentInfo.copy(comment); input.message(message); enableEdit(false); pendingGroup = group; final LocalComments lc = new LocalComments(psId); GerritCallback<CommentInfo> cb = new GerritCallback<CommentInfo>() { @Override public void onSuccess(CommentInfo result) { enableEdit(true); pendingGroup = null; set(result); setEdit(false); if (autoClosed) { setOpen(false); } getCommentManager().setUnsaved(DraftBox.this, false); } @Override public void onFailure(Throwable e) { enableEdit(true); pendingGroup = null; if (RestApi.isNotSignedIn(e)) { CommentInfo saved = CommentInfo.copy(comment); saved.message(editArea.getValue().trim()); lc.setInlineComment(saved); } super.onFailure(e); } }; if (input.id() == null) { CommentApi.createDraft(psId, input, group.add(cb)); } else { CommentApi.updateDraft(psId, input.id(), input, group.add(cb)); } CodeMirror cm = getCm(); cm.vim().handleKey("<Esc>"); cm.focus(); } private void enableEdit(boolean on) { editArea.setEnabled(on); save.setEnabled(on); cancel.setEnabled(on); discard2.setEnabled(on); } @UiHandler("cancel") void onCancel(ClickEvent e) { e.stopPropagation(); if (isNew() && !isDirty()) { removeUI(); restoreSelection(); } else { setEdit(false); if (autoClosed) { setOpen(false); } getCm().focus(); } } @UiHandler({ "discard1", "discard2" }) void onDiscard(ClickEvent e) { e.stopPropagation(); if (isNew()) { removeUI(); restoreSelection(); } else { setEdit(false); pendingGroup = new CallbackGroup(); CommentApi.deleteDraft(psId, comment.id(), pendingGroup.addFinal(new GerritCallback<JavaScriptObject>() { @Override public void onSuccess(JavaScriptObject result) { pendingGroup = null; removeUI(); } })); } } @UiHandler("editArea") void onKeyDown(KeyDownEvent e) { resizeTimer.cancel(); if ((e.isControlKeyDown() || e.isMetaKeyDown()) && !e.isAltKeyDown() && !e.isShiftKeyDown()) { switch (e.getNativeKeyCode()) { case 's': case 'S': e.preventDefault(); CallbackGroup group = new CallbackGroup(); save(group); group.done(); return; } } else if (e.getNativeKeyCode() == KeyCodes.KEY_ESCAPE && !isDirty()) { if (isNew()) { removeUI(); restoreSelection(); return; } setEdit(false); if (autoClosed) { setOpen(false); } getCm().focus(); return; } expandTimer.schedule(250); } @UiHandler("editArea") void onBlur(@SuppressWarnings("unused") BlurEvent e) { resizeTimer.cancel(); } private void initResizeHandler() { resizeTimer = new Timer() { @Override public void run() { getCommentGroup().resize(); } }; addDomHandler(new MouseMoveHandler() { @Override public void onMouseMove(MouseMoveEvent event) { int h = editArea.getOffsetHeight(); if (isEdit() && h != editAreaHeight) { getCommentGroup().resize(); resizeTimer.scheduleRepeating(50); editAreaHeight = h; } } }, MouseMoveEvent.getType()); addDomHandler(new MouseUpHandler() { @Override public void onMouseUp(MouseUpEvent event) { resizeTimer.cancel(); getCommentGroup().resize(); } }, MouseUpEvent.getType()); } private boolean isNew() { return comment.id() == null; } private boolean isDirty() { String msg = editArea.getValue().trim(); if (isNew()) { return msg.length() > 0; } return !msg.equals(comment.message() != null ? comment.message().trim() : ""); } }