Java tutorial
/******************************************************************************* * Copyright (c) 2004, 2010 Tasktop Technologies and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Tasktop Technologies - initial API and implementation *******************************************************************************/ package org.eclipse.mylyn.internal.tasks.ui; import java.lang.reflect.InvocationTargetException; import java.util.Collections; import java.util.Set; import org.apache.commons.lang.reflect.MethodUtils; import org.eclipse.jface.action.IMenuListener; import org.eclipse.jface.action.IMenuManager; import org.eclipse.jface.action.MenuManager; import org.eclipse.jface.viewers.ISelectionProvider; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.mylyn.commons.ui.SelectionProviderAdapter; import org.eclipse.mylyn.internal.tasks.core.ITaskListChangeListener; import org.eclipse.mylyn.internal.tasks.core.TaskContainerDelta; import org.eclipse.mylyn.internal.tasks.ui.actions.RepositoryElementActionGroup; import org.eclipse.mylyn.internal.tasks.ui.util.TasksUiInternal; import org.eclipse.mylyn.internal.tasks.ui.views.TaskListView; import org.eclipse.mylyn.tasks.core.ITask; import org.eclipse.mylyn.tasks.core.ITaskActivationListener; import org.eclipse.mylyn.tasks.core.TaskActivationAdapter; import org.eclipse.mylyn.tasks.ui.TasksUi; import org.eclipse.swt.SWT; import org.eclipse.swt.events.MenuDetectEvent; import org.eclipse.swt.events.MenuDetectListener; import org.eclipse.swt.events.MouseAdapter; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Menu; import org.eclipse.ui.IWorkbenchPart; import org.eclipse.ui.forms.events.HyperlinkAdapter; import org.eclipse.ui.forms.events.HyperlinkEvent; import org.eclipse.ui.internal.ObjectActionContributorManager; import org.eclipse.ui.menus.WorkbenchWindowControlContribution; /** * @author Mik Kersten * @author Leo Dos Santos */ public class TaskTrimWidget extends WorkbenchWindowControlContribution { public static String ID_CONTAINER = "org.eclipse.mylyn.tasks.ui.trim.container"; //$NON-NLS-1$ public static String ID_CONTROL = "org.eclipse.mylyn.tasks.ui.trim.control"; //$NON-NLS-1$ private Composite composite; private ITask activeTask; private MenuManager menuManager; private Menu menu; private TaskScalingHyperlink activeTaskLabel; private final ITaskActivationListener taskActivationListener = new TaskActivationAdapter() { @Override public void taskActivated(ITask task) { activeTask = task; indicateActiveTask(); } @Override public void taskDeactivated(ITask task) { activeTask = null; indicateNoActiveTask(); } }; private final ITaskListChangeListener taskListListener = new ITaskListChangeListener() { public void containersChanged(Set<TaskContainerDelta> containers) { // update label in case task changes if (activeTask != null) { for (TaskContainerDelta taskContainerDelta : containers) { if (activeTask.equals(taskContainerDelta.getElement())) { if (taskContainerDelta.getKind().equals(TaskContainerDelta.Kind.CONTENT)) { Display.getDefault().asyncExec(new Runnable() { public void run() { if (activeTask != null && activeTask.isActive()) { indicateActiveTask(); } } }); return; } } } } } }; private SelectionProviderAdapter activeTaskSelectionProvider; private RepositoryElementActionGroup actionGroup; public TaskTrimWidget() { TasksUi.getTaskActivityManager().addActivationListener(taskActivationListener); TasksUiPlugin.getTaskList().addChangeListener(taskListListener); hookContextMenu(); } @Override public void dispose() { if (composite != null && !composite.isDisposed()) { composite.dispose(); } composite = null; if (menuManager != null) { menuManager.removeAll(); menuManager.dispose(); } menuManager = null; if (menu != null && !menu.isDisposed()) { menu.dispose(); } menu = null; actionGroup.setSelectionProvider(null); TasksUi.getTaskActivityManager().removeActivationListener(taskActivationListener); TasksUiPlugin.getTaskList().removeChangeListener(taskListListener); } @Override protected Control createControl(Composite parent) { composite = new Composite(parent, SWT.NONE); GridLayout layout = new GridLayout(); layout.numColumns = 1; layout.horizontalSpacing = 0; layout.marginHeight = 0; layout.marginLeft = 0; layout.marginRight = 0; composite.setLayout(layout); //composite.setLayoutData(new GridData(SWT.LEFT, SWT.CENTER, false, true)); createStatusComposite(composite); return composite; } private Composite createStatusComposite(final Composite container) { GC gc = new GC(container); Point p = gc.textExtent("WWWWWWWWWWWWWWW"); //$NON-NLS-1$ gc.dispose(); activeTaskLabel = new TaskScalingHyperlink(container, SWT.RIGHT); // activeTaskLabel.setLayoutData(new GridData(p.x, SWT.DEFAULT)); GridData gridData = new GridData(SWT.LEFT, SWT.CENTER, false, true); gridData.widthHint = p.x; gridData.minimumWidth = p.x; gridData.horizontalIndent = 0; activeTaskLabel.setLayoutData(gridData); activeTaskLabel.setText(Messages.TaskTrimWidget__no_task_active_); activeTask = TasksUi.getTaskActivityManager().getActiveTask(); if (activeTask != null) { indicateActiveTask(); } activeTaskLabel.addMenuDetectListener(new MenuDetectListener() { public void menuDetected(MenuDetectEvent e) { if (menu != null) { menu.dispose(); } menu = menuManager.createContextMenu(container); menu.setVisible(true); } }); activeTaskLabel.addHyperlinkListener(new HyperlinkAdapter() { @Override public void linkActivated(HyperlinkEvent e) { TaskListView taskListView = TaskListView.getFromActivePerspective(); if (taskListView != null && taskListView.getDrilledIntoCategory() != null) { taskListView.goUpToRoot(); } TasksUiInternal.refreshAndOpenTaskListElement((TasksUi.getTaskActivityManager().getActiveTask())); } }); activeTaskLabel.addMouseListener(new MouseAdapter() { @Override public void mouseDown(MouseEvent e) { // only handle left clicks, context menu is handled by platform if (e.button == 1) { if (activeTask == null) { return; } TaskListView taskListView = TaskListView.getFromActivePerspective(); if (taskListView != null && taskListView.getDrilledIntoCategory() != null) { taskListView.goUpToRoot(); } TasksUiInternal.refreshAndOpenTaskListElement(activeTask); } } }); return activeTaskLabel; } private void hookContextMenu() { activeTaskSelectionProvider = new SelectionProviderAdapter(); actionGroup = new RepositoryElementActionGroup(); actionGroup.setSelectionProvider(activeTaskSelectionProvider); menuManager = new MenuManager("#PopupMenu"); //$NON-NLS-1$ menuManager.setRemoveAllWhenShown(true); menuManager.addMenuListener(new IMenuListener() { public void menuAboutToShow(IMenuManager manager) { actionGroup.fillContextMenu(manager); // trims do not have a workbench part so there is no simple way of registering the // context menu if (!contributeObjectActionsOld(manager)) { contributeObjectActionsNew(manager); } } }); } public void indicateActiveTask() { if (activeTaskLabel == null || activeTaskLabel.isDisposed()) { return; } //activeTaskLabel.setText(shortenText(activeTask.getSummary())); activeTaskLabel.setText(activeTask.getSummary()); activeTaskLabel.setUnderlined(true); activeTaskLabel.setToolTipText(activeTask.getSummary()); activeTaskSelectionProvider.setSelection(new StructuredSelection(activeTask)); } public void indicateNoActiveTask() { if (activeTaskLabel == null || activeTaskLabel.isDisposed()) { return; } activeTaskLabel.setText(Messages.TaskTrimWidget__no_active_task_); activeTaskLabel.setUnderlined(false); activeTaskLabel.setToolTipText(""); //$NON-NLS-1$ activeTaskSelectionProvider.setSelection(StructuredSelection.EMPTY); } private boolean contributeObjectActionsOld(IMenuManager manager) { try { MethodUtils.invokeExactMethod(ObjectActionContributorManager.getManager(), "contributeObjectActions", //$NON-NLS-1$ new Object[] { null, manager, activeTaskSelectionProvider }, new Class[] { IWorkbenchPart.class, IMenuManager.class, ISelectionProvider.class }); } catch (NoSuchMethodException e) { return false; } catch (IllegalAccessException e) { return false; } catch (InvocationTargetException e) { return false; } return true; } private boolean contributeObjectActionsNew(IMenuManager manager) { try { MethodUtils.invokeExactMethod(ObjectActionContributorManager.getManager(), "contributeObjectActions", //$NON-NLS-1$ new Object[] { null, manager, activeTaskSelectionProvider, Collections.EMPTY_SET }, new Class[] { IWorkbenchPart.class, IMenuManager.class, ISelectionProvider.class, Set.class }); } catch (NoSuchMethodException e) { return false; } catch (IllegalAccessException e) { return false; } catch (InvocationTargetException e) { return false; } return true; } // // From PerspectiveBarContributionItem // private String shortenText(String taskLabel) { // if (taskLabel == null || composite == null || composite.isDisposed()) { // return null; // } // // String returnText = taskLabel; // GC gc = new GC(composite); // int maxWidth = p.x; // // if (gc.textExtent(taskLabel).x > maxWidth) { // for (int i = taskLabel.length(); i > 0; i--) { // String test = taskLabel.substring(0, i); // test = test + "..."; // if (gc.textExtent(test).x < maxWidth) { // returnText = test; // break; // } // } // } // // gc.dispose(); // return returnText; // } }