/* 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 org.activiti.engine.ProcessEngines;
import org.activiti.engine.TaskService;
import org.activiti.engine.task.Task;
import org.activiti.explorer.ExplorerApp;
import org.activiti.explorer.data.LazyLoadingContainer;
import org.activiti.explorer.data.LazyLoadingQuery;
import org.activiti.explorer.navigation.UriFragment;
import org.activiti.explorer.ui.AbstractTablePage;
import org.activiti.explorer.ui.Images;
import org.activiti.explorer.ui.custom.TaskListHeader;
import org.activiti.explorer.ui.custom.ToolBar;
import org.activiti.explorer.ui.mainlayout.ExplorerLayout;
import org.activiti.explorer.ui.util.ThemeImageColumnGenerator;
import com.vaadin.data.Item;
import com.vaadin.data.Property;
import com.vaadin.data.Property.ValueChangeEvent;
import com.vaadin.data.Property.ValueChangeListener;
import com.vaadin.ui.Component;
import com.vaadin.ui.Table;
/**
* Abstract super class for all task pages (inbox, queued, archived, etc.),
* Builds up the default UI: task list on the left, central panel and events on the right.
*
* @author Joram Barrez
*/
public abstract class TaskPage extends AbstractTablePage {
private static final long serialVersionUID = 1L;
protected transient TaskService taskService;
protected String taskId;
protected Table taskTable;
protected LazyLoadingContainer taskListContainer;
protected LazyLoadingQuery lazyLoadingQuery;
protected TaskEventsPanel taskEventPanel;
public TaskPage() {
taskService = ProcessEngines.getDefaultProcessEngine().getTaskService();
}
public TaskPage(String taskId) {
this();
this.taskId = taskId;
}
@Override
protected void initUi() {
super.initUi();
if (taskId == null) {
selectElement(0);
} else {
int index = taskListContainer.getIndexForObjectId(taskId);
selectElement(index);
}
if (taskListContainer.size() == 0) {
ExplorerApp.get().setCurrentUriFragment(getUriFragment(null));
}
}
@Override
protected ToolBar createMenuBar() {
return new TaskMenuBar();
}
@Override
protected Table createList() {
taskTable = new Table();
taskTable.addStyleName(ExplorerLayout.STYLE_TASK_LIST);
taskTable.addStyleName(ExplorerLayout.STYLE_SCROLLABLE);
// Listener to change right panel when clicked on a task
taskTable.addListener(getListSelectionListener());
this.lazyLoadingQuery = createLazyLoadingQuery();
this.taskListContainer = new LazyLoadingContainer(lazyLoadingQuery, 30);
taskTable.setContainerDataSource(taskListContainer);
// Create column header
taskTable.addGeneratedColumn("icon", new ThemeImageColumnGenerator(Images.TASK_22));
taskTable.setColumnWidth("icon", 22);
taskTable.addContainerProperty("name", String.class, null);
taskTable.setColumnHeaderMode(Table.COLUMN_HEADER_MODE_HIDDEN);
return taskTable;
}
protected ValueChangeListener getListSelectionListener() {
return new Property.ValueChangeListener() {
private static final long serialVersionUID = 1L;
public void valueChange(ValueChangeEvent event) {
Item item = taskTable.getItem(event.getProperty().getValue()); // the value of the property is the itemId of the table entry
if(item != null) {
String id = (String) item.getItemProperty("id").getValue();
setDetailComponent(createDetailComponent(id));
UriFragment taskFragment = getUriFragment(id);
ExplorerApp.get().setCurrentUriFragment(taskFragment);
} else {
// Nothing is selected
setDetailComponent(null);
ExplorerApp.get().setCurrentUriFragment(getUriFragment(null));
}
}
};
}
protected Component createDetailComponent(String id) {
Task task = taskService.createTaskQuery().taskId(id).singleResult();
Component detailComponent = new TaskDetailPanel(task, TaskPage.this);
taskEventPanel.setTaskId(task.getId());
return detailComponent;
}
@Override
protected Component getEventComponent() {
return getTaskEventPanel();
}
public TaskEventsPanel getTaskEventPanel() {
if(taskEventPanel == null) {
taskEventPanel = new TaskEventsPanel();
}
return taskEventPanel;
}
@Override
public Component getSearchComponent() {
return new TaskListHeader();
}
@Override
public void refreshSelectNext() {
// Selects new element in the table
super.refreshSelectNext();
// Update the counts in the header
addMenuBar();
}
protected abstract LazyLoadingQuery createLazyLoadingQuery();
protected abstract UriFragment getUriFragment(String taskId);
}