Java tutorial
/* 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 org.activiti.explorer.ui.task; import java.io.InputStream; import java.util.List; import org.activiti.engine.IdentityService; import org.activiti.engine.ProcessEngines; import org.activiti.engine.TaskService; import org.activiti.engine.identity.Picture; import org.activiti.explorer.Constants; import org.activiti.explorer.ExplorerApp; import org.activiti.explorer.I18nManager; import org.activiti.explorer.Messages; import org.activiti.explorer.ViewManager; import org.activiti.explorer.ui.Images; import org.activiti.explorer.ui.mainlayout.ExplorerLayout; import org.activiti.explorer.util.time.HumanTime; import com.vaadin.event.Action; import com.vaadin.event.Action.Handler; import com.vaadin.event.ShortcutAction; import com.vaadin.terminal.StreamResource; import com.vaadin.terminal.StreamResource.StreamSource; import com.vaadin.ui.Alignment; import com.vaadin.ui.Button; import com.vaadin.ui.Button.ClickEvent; import com.vaadin.ui.Button.ClickListener; import com.vaadin.ui.Embedded; import com.vaadin.ui.GridLayout; import com.vaadin.ui.HorizontalLayout; import com.vaadin.ui.Label; import com.vaadin.ui.Panel; import com.vaadin.ui.TextField; import com.vaadin.ui.VerticalLayout; import com.vaadin.ui.themes.Reindeer; /** * Component containing all events for a given task. * * @author Joram Barrez */ public class TaskEventsPanel extends Panel { private static final long serialVersionUID = 1L; protected transient IdentityService identityService; protected transient TaskService taskService; protected I18nManager i18nManager; protected ViewManager viewManager; protected TaskEventTextResolver taskEventTextResolver; protected String taskId; protected List<org.activiti.engine.task.Event> taskEvents; protected TextField commentInputField; protected GridLayout eventGrid; public TaskEventsPanel() { this.taskService = ProcessEngines.getDefaultProcessEngine().getTaskService(); this.identityService = ProcessEngines.getDefaultProcessEngine().getIdentityService(); this.i18nManager = ExplorerApp.get().getI18nManager(); this.viewManager = ExplorerApp.get().getViewManager(); this.taskEventTextResolver = new TaskEventTextResolver(); ((VerticalLayout) getContent()).setSpacing(true); ((VerticalLayout) getContent()).setMargin(true); setHeight(100, UNITS_PERCENTAGE); addStyleName(ExplorerLayout.STYLE_TASK_EVENT_PANEL); addTitle(); addInputField(); initEventGrid(); addTaskEvents(); } public void refreshTaskEvents() { eventGrid.removeAllComponents(); addTaskEvents(); } /** * Set the task this component is showing the events for. Triggers * an update of the UI. */ public void setTaskId(String taskId) { this.taskId = taskId; refreshTaskEvents(); } protected void addTitle() { Label eventTitle = new Label(i18nManager.getMessage(Messages.EVENT_TITLE)); eventTitle.addStyleName(Reindeer.LABEL_H2); addComponent(eventTitle); } protected void initEventGrid() { eventGrid = new GridLayout(); eventGrid.setColumns(2); eventGrid.setSpacing(true); eventGrid.setMargin(true, false, false, false); eventGrid.setWidth("100%"); eventGrid.setColumnExpandRatio(1, 1.0f); eventGrid.addStyleName(ExplorerLayout.STYLE_TASK_EVENT_GRID); addComponent(eventGrid); } protected void addTaskEvents() { if (taskId != null) { taskEvents = taskService.getTaskEvents(taskId); for (final org.activiti.engine.task.Event event : taskEvents) { addTaskEventPicture(event, eventGrid); addTaskEventText(event, eventGrid); } } } protected void addTaskEventPicture(final org.activiti.engine.task.Event taskEvent, GridLayout eventGrid) { final Picture userPicture = identityService.getUserPicture(taskEvent.getUserId()); Embedded authorPicture = null; if (userPicture != null) { StreamResource imageresource = new StreamResource(new StreamSource() { private static final long serialVersionUID = 1L; public InputStream getStream() { return userPicture.getInputStream(); } }, "event_" + taskEvent.getUserId() + "." + Constants.MIMETYPE_EXTENSION_MAPPING.get(userPicture.getMimeType()), ExplorerApp.get()); authorPicture = new Embedded(null, imageresource); } else { authorPicture = new Embedded(null, Images.USER_50); } authorPicture.setType(Embedded.TYPE_IMAGE); authorPicture.setHeight("48px"); authorPicture.setWidth("48px"); authorPicture.addStyleName(ExplorerLayout.STYLE_TASK_EVENT_PICTURE); eventGrid.addComponent(authorPicture); } protected void addTaskEventText(final org.activiti.engine.task.Event taskEvent, final GridLayout eventGrid) { VerticalLayout layout = new VerticalLayout(); layout.addStyleName(ExplorerLayout.STYLE_TASK_EVENT); layout.setWidth("100%"); eventGrid.addComponent(layout); // Actual text Label text = taskEventTextResolver.resolveText(taskEvent); text.setWidth("100%"); layout.addComponent(text); // Time Label time = new Label(new HumanTime(i18nManager).format(taskEvent.getTime())); time.setSizeUndefined(); time.addStyleName(ExplorerLayout.STYLE_TASK_EVENT_TIME); layout.addComponent(time); } protected void addInputField() { HorizontalLayout layout = new HorizontalLayout(); layout.setSpacing(true); layout.setWidth(100, UNITS_PERCENTAGE); addComponent(layout); Panel textFieldPanel = new Panel(); // Hack: actionHandlers can only be attached to panels or windows textFieldPanel.addStyleName(Reindeer.PANEL_LIGHT); textFieldPanel.setContent(new VerticalLayout()); textFieldPanel.setWidth(100, UNITS_PERCENTAGE); layout.addComponent(textFieldPanel); layout.setExpandRatio(textFieldPanel, 1.0f); commentInputField = new TextField(); commentInputField.setWidth(100, UNITS_PERCENTAGE); textFieldPanel.addComponent(commentInputField); // Hack to catch keyboard 'enter' textFieldPanel.addActionHandler(new Handler() { public void handleAction(Action action, Object sender, Object target) { addNewComment(commentInputField.getValue().toString()); } public Action[] getActions(Object target, Object sender) { return new Action[] { new ShortcutAction("enter", ShortcutAction.KeyCode.ENTER, null) }; } }); Button addCommentButton = new Button(i18nManager.getMessage(Messages.TASK_ADD_COMMENT)); layout.addComponent(addCommentButton); layout.setComponentAlignment(addCommentButton, Alignment.MIDDLE_LEFT); addCommentButton.addListener(new ClickListener() { public void buttonClick(ClickEvent event) { addNewComment(commentInputField.getValue().toString()); } }); } protected void addNewComment(String text) { taskService.addComment(taskId, null, text); refreshTaskEvents(); commentInputField.setValue(""); commentInputField.focus(); } }