Java tutorial
/* ********************************************************************** ** ** Copyright notice ** ** ** ** (c) 2005-2009 RSSOwl Development Team ** ** http://www.rssowl.org/ ** ** ** ** 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.rssowl.org/legal/epl-v10.html ** ** ** ** A copy is found in the file epl-v10.html and important notices to the ** ** license from the team is found in the textfile LICENSE.txt distributed ** ** in this package. ** ** ** ** This copyright notice MUST APPEAR in all copies of the file! ** ** ** ** Contributors: ** ** RSSOwl Development Team - initial API and implementation ** ** ** ** ********************************************************************** */ package org.rssowl.ui.internal.dialogs; import org.eclipse.core.runtime.SafeRunner; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.TitleAreaDialog; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.resource.LocalResourceManager; import org.eclipse.jface.util.LocalSelectionTransfer; import org.eclipse.jface.viewers.DoubleClickEvent; import org.eclipse.jface.viewers.IDoubleClickListener; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.Viewer; import org.eclipse.jface.viewers.ViewerComparator; import org.eclipse.jface.viewers.ViewerDropAdapter; import org.eclipse.osgi.util.NLS; import org.eclipse.swt.SWT; import org.eclipse.swt.dnd.DND; import org.eclipse.swt.dnd.Transfer; import org.eclipse.swt.dnd.TransferData; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; import org.rssowl.core.persist.IBookMark; import org.rssowl.core.persist.IFolder; import org.rssowl.core.persist.IFolderChild; import org.rssowl.core.persist.IMark; import org.rssowl.core.persist.INewsBin; import org.rssowl.core.persist.ISearchMark; import org.rssowl.core.persist.dao.DynamicDAO; import org.rssowl.core.persist.dao.IFolderDAO; import org.rssowl.core.persist.event.FolderAdapter; import org.rssowl.core.persist.event.FolderEvent; import org.rssowl.core.util.CoreUtils; import org.rssowl.core.util.LoggingSafeRunnable; import org.rssowl.core.util.ReparentInfo; import org.rssowl.ui.internal.ApplicationWorkbenchWindowAdvisor; import org.rssowl.ui.internal.OwlUI; import org.rssowl.ui.internal.actions.DeleteTypesAction; import org.rssowl.ui.internal.actions.EntityPropertyDialogAction; import org.rssowl.ui.internal.actions.NewFolderAction; import org.rssowl.ui.internal.util.JobRunner; import org.rssowl.ui.internal.util.LayoutUtils; import java.util.ArrayList; import java.util.Collection; import java.util.List; import java.util.Set; /** * The <code>ManageSetsDialog</code> allows to manage bookmark-sets. These are * root-leveld Folders containing other Folders and Marks. * * @author bpasero */ public class ManageSetsDialog extends TitleAreaDialog { /* Keep the visible instance saved */ private static ManageSetsDialog fgVisibleInstance; private LocalResourceManager fResources; private TableViewer fViewer; private Label fStatusLabel; private Button fEditButton; private Button fDeleteButton; private IFolder fSelectedSet; private FolderAdapter fFolderListener; /** * @param parentShell * @param selectedSet */ public ManageSetsDialog(Shell parentShell, IFolder selectedSet) { super(parentShell); fSelectedSet = selectedSet; fResources = new LocalResourceManager(JFaceResources.getResources()); } /** * @return Returns an instance of <code>ManageSetsDialog</code> or * <code>NULL</code> in case no instance is currently open. */ public static ManageSetsDialog getVisibleInstance() { return fgVisibleInstance; } /* * @see org.eclipse.jface.window.Window#open() */ @Override public int open() { fgVisibleInstance = this; registerListeners(); return super.open(); } private void registerListeners() { fFolderListener = new FolderAdapter() { @Override public void entitiesAdded(final Set<FolderEvent> events) { JobRunner.runInUIThread(fViewer.getControl(), new Runnable() { public void run() { for (FolderEvent folderEvent : events) { IFolder folder = folderEvent.getEntity(); if (folder.getParent() == null) { fViewer.add(folder); fViewer.setSelection(new StructuredSelection(folder)); } } } }); } }; DynamicDAO.addEntityListener(IFolder.class, fFolderListener); } /* * @see org.eclipse.jface.dialogs.TitleAreaDialog#close() */ @Override public boolean close() { unregisterListeners(); fgVisibleInstance = null; fResources.dispose(); return super.close(); } private void unregisterListeners() { DynamicDAO.removeEntityListener(IFolder.class, fFolderListener); } /* * @see org.eclipse.jface.window.Window#configureShell(org.eclipse.swt.widgets.Shell) */ @Override protected void configureShell(Shell shell) { super.configureShell(shell); shell.setText(Messages.ManageSetsDialog_MANAGE_SETS); } /* * @see org.eclipse.jface.dialogs.TitleAreaDialog#createDialogArea(org.eclipse.swt.widgets.Composite) */ @Override protected Control createDialogArea(Composite parent) { /* Title */ setTitle(Messages.ManageSetsDialog_SETS); /* Title Image */ setTitleImage(OwlUI.getImage(fResources, "icons/wizban/bkmrk_set_title.gif")); //$NON-NLS-1$ /* Title Message */ showInfo(); /* Separator */ new Label(parent, SWT.SEPARATOR | SWT.HORIZONTAL) .setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false)); /* Composite to hold all components */ Composite composite = new Composite(parent, SWT.NONE); composite.setLayout(LayoutUtils.createGridLayout(2, 5, 10)); composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false)); /* TableViewer to display Bookmark Sets */ fViewer = new TableViewer(composite, SWT.BORDER); fViewer.getTable().setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false)); ((GridData) fViewer.getTable().getLayoutData()).heightHint = fViewer.getTable().getItemHeight() * 7; fViewer.getTable().setData(ApplicationWorkbenchWindowAdvisor.FOCUSLESS_SCROLL_HOOK, new Object()); /* Drag and Drop */ initDragAndDrop(); /* ContentProvider returns Root-Folders */ fViewer.setContentProvider(new IStructuredContentProvider() { public Object[] getElements(Object inputElement) { return CoreUtils.loadRootFolders().toArray(); } public void dispose() { } public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { } }); /* Simple LabelProvider */ fViewer.setLabelProvider(new LabelProvider() { @Override public String getText(Object element) { return ((IFolder) element).getName(); } @Override public Image getImage(Object element) { return OwlUI.getImage(fResources, OwlUI.BOOKMARK_SET); } }); /* Sort by ID to show latest Set at bottom */ fViewer.setComparator(new ViewerComparator() { @Override public int compare(Viewer viewer, Object e1, Object e2) { IFolder folder1 = (IFolder) e1; IFolder folder2 = (IFolder) e2; return folder1.getId().compareTo(folder2.getId()); } }); /* Edit on Doubleclick */ fViewer.addDoubleClickListener(new IDoubleClickListener() { public void doubleClick(DoubleClickEvent event) { onEdit(); } }); /* Set input (ignored by ContentProvider anyways) */ fViewer.setInput(this); /* Container for the Buttons to Manage Sets */ Composite buttonContainer = new Composite(composite, SWT.None); buttonContainer.setLayout(LayoutUtils.createGridLayout(1, 0, 0)); buttonContainer.setLayoutData(new GridData(SWT.BEGINNING, SWT.FILL, false, false)); /* Adds a new Bookmark Set */ Button addButton = new Button(buttonContainer, SWT.PUSH); addButton.setText(Messages.ManageSetsDialog_NEW); applyDialogFont(addButton); setButtonLayoutData(addButton); addButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { onAdd(); } }); /* Edits a selected Bookmark Set */ fEditButton = new Button(buttonContainer, SWT.PUSH); fEditButton.setText(Messages.ManageSetsDialog_EDIT); applyDialogFont(fEditButton); setButtonLayoutData(fEditButton); fEditButton.setEnabled(false); fEditButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { onEdit(); } }); /* Deletes the selected Bookmark Set */ fDeleteButton = new Button(buttonContainer, SWT.PUSH); fDeleteButton.setText(Messages.ManageSetsDialog_DELETE); applyDialogFont(fDeleteButton); setButtonLayoutData(fDeleteButton); ((GridData) fDeleteButton.getLayoutData()).verticalAlignment = SWT.END; ((GridData) fDeleteButton.getLayoutData()).grabExcessVerticalSpace = true; fDeleteButton.setEnabled(false); fDeleteButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { onDelete(); } }); /* Container for the status-message */ Composite statusContainer = new Composite(composite, SWT.None); statusContainer.setLayout(LayoutUtils.createGridLayout(1, 5, 0)); statusContainer.setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, false, false, 2, 1)); fStatusLabel = new Label(statusContainer, SWT.NONE); fStatusLabel.setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false)); /* Update Status Label when selection changes */ fViewer.addSelectionChangedListener(new ISelectionChangedListener() { public void selectionChanged(SelectionChangedEvent event) { onSelectionChange(); } }); /* Pre-Select the current visible Set */ Collection<IFolder> rootFolders = DynamicDAO.getDAO(IFolderDAO.class).loadRoots(); for (IFolder rootFolder : rootFolders) { if (rootFolder.equals(fSelectedSet)) { fViewer.setSelection(new StructuredSelection(rootFolder)); break; } } /* Separator */ new Label(parent, SWT.SEPARATOR | SWT.HORIZONTAL) .setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false)); applyDialogFont(composite); return composite; } private void initDragAndDrop() { int ops = DND.DROP_COPY | DND.DROP_MOVE; Transfer[] transfers = new Transfer[] { LocalSelectionTransfer.getTransfer() }; ViewerDropAdapter dropAdapter = new ViewerDropAdapter(fViewer) { @Override public boolean validateDrop(final Object target, int operation, TransferData transferType) { if (LocalSelectionTransfer.getTransfer().isSupportedType(transferType)) { final boolean[] result = new boolean[] { false }; SafeRunner.run(new LoggingSafeRunnable() { public void run() throws Exception { ISelection selection = LocalSelectionTransfer.getTransfer().getSelection(); if (selection instanceof IStructuredSelection) { List<?> draggedObjects = ((IStructuredSelection) selection).toList(); result[0] = isValidDrop(draggedObjects, target); } } }); return result[0]; } return false; } @Override public boolean performDrop(final Object data) { if (data instanceof IStructuredSelection) { SafeRunner.run(new LoggingSafeRunnable() { public void run() throws Exception { IStructuredSelection selection = (IStructuredSelection) data; List<?> draggedObjects = selection.toList(); perfromDrop(draggedObjects, getCurrentTarget()); } }); return true; } return false; } }; dropAdapter.setFeedbackEnabled(false); fViewer.addDropSupport(ops, transfers, dropAdapter); } private boolean isValidDrop(List<?> draggedObjects, Object dropTarget) { /* Require Folder as Target */ if (!(dropTarget instanceof IFolder)) return false; /* Check validity for each dragged Object */ IFolder dropFolder = (IFolder) dropTarget; for (Object draggedObject : draggedObjects) { /* Dragged Folder */ if (draggedObject instanceof IFolder) { IFolder draggedFolder = (IFolder) draggedObject; if (CoreUtils.hasChildRelation(dropFolder, draggedFolder)) return false; } /* Dragged Mark */ else if (draggedObject instanceof IMark) { IMark draggedMark = (IMark) draggedObject; if (CoreUtils.hasChildRelation(dropFolder, draggedMark)) return false; } } return true; } private void perfromDrop(List<?> draggedObjects, Object dropTarget) { /* Require a Folder as drop target */ if (!(dropTarget instanceof IFolder) || draggedObjects.isEmpty()) return; IFolder dropFolder = (IFolder) dropTarget; List<ReparentInfo<IFolderChild, IFolder>> reparenting = new ArrayList<ReparentInfo<IFolderChild, IFolder>>( draggedObjects.size()); /* For each dragged Object */ for (Object object : draggedObjects) { if (object instanceof IFolder || object instanceof IMark) { IFolderChild draggedFolderChild = (IFolderChild) object; reparenting.add(ReparentInfo.create(draggedFolderChild, dropFolder, null, null)); } } /* Perform reparenting */ CoreUtils.reparentWithProperties(reparenting); fViewer.setSelection(fViewer.getSelection()); } private void onAdd() { showInfo(); NewFolderAction newFolderAction = new NewFolderAction(getShell(), null, null); newFolderAction.setRootMode(true); newFolderAction.run(null); fViewer.refresh(); /* Select and Focus the added Set */ Table table = fViewer.getTable(); Object lastItem = table.getItem(table.getItemCount() - 1).getData(); fViewer.setSelection(new StructuredSelection(lastItem)); table.setFocus(); } private void onEdit() { showInfo(); IStructuredSelection selection = (IStructuredSelection) fViewer.getSelection(); if (!selection.isEmpty()) { new EntityPropertyDialogAction(this, fViewer).run(); fViewer.refresh(); } } private void onDelete() { showInfo(); /* Require at least 1 Set to remain undeleted */ if (fViewer.getTable().getItemCount() == 1) { setErrorMessage(Messages.ManageSetsDialog_DELETE_LAST_SET_ERROR); return; } IStructuredSelection selection = (IStructuredSelection) fViewer.getSelection(); if (!selection.isEmpty()) { DeleteTypesAction deleteAction = new DeleteTypesAction(getShell(), selection); deleteAction.run(); if (deleteAction.isConfirmed()) fViewer.remove(selection.getFirstElement()); } } private void onSelectionChange() { updateStatusLabel(); ISelection selection = fViewer.getSelection(); fEditButton.setEnabled(!selection.isEmpty()); fDeleteButton.setEnabled(!selection.isEmpty()); } /* * @see org.eclipse.jface.window.Window#getShellStyle() */ @Override protected int getShellStyle() { int style = SWT.TITLE | SWT.BORDER | SWT.CLOSE | getDefaultOrientation(); return style; } /* * @see org.eclipse.jface.dialogs.Dialog#createButtonsForButtonBar(org.eclipse.swt.widgets.Composite) */ @Override protected void createButtonsForButtonBar(Composite parent) { createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true); } /* * @see org.eclipse.jface.dialogs.Dialog#initializeBounds() */ @Override protected void initializeBounds() { super.initializeBounds(); Shell shell = getShell(); /* Minimum Size */ int minWidth = convertHorizontalDLUsToPixels(OwlUI.MIN_DIALOG_WIDTH_DLU); int minHeight = shell.computeSize(minWidth, SWT.DEFAULT).y; /* Required Size */ Point requiredSize = shell.computeSize(SWT.DEFAULT, SWT.DEFAULT); shell.setSize(Math.max(minWidth, requiredSize.x), Math.max(minHeight, requiredSize.y)); LayoutUtils.positionShell(shell); } private void showInfo() { setErrorMessage(null); setMessage(Messages.ManageSetsDialog_SELECT_SET); } private void updateStatusLabel() { IStructuredSelection selection = (IStructuredSelection) fViewer.getSelection(); if (selection.isEmpty()) fStatusLabel.setText(""); //$NON-NLS-1$ else { IFolder bookmarkSet = (IFolder) selection.getFirstElement(); int counter[] = new int[4]; count(bookmarkSet, counter); StringBuilder itemBuilder = new StringBuilder(); if (counter[0] > 0) itemBuilder.append(counter[0] == 1 ? Messages.ManageSetsDialog_1_FOLDER : (NLS.bind(Messages.ManageSetsDialog_N_FOLDERS, counter[0]))).append(", "); //$NON-NLS-1$ if (counter[1] > 0) itemBuilder.append(counter[1] == 1 ? Messages.ManageSetsDialog_1_BOOKMARK : (NLS.bind(Messages.ManageSetsDialog_N_BOOKMARKS, counter[1]))).append(", "); //$NON-NLS-1$ if (counter[2] > 0) itemBuilder.append(counter[2] == 1 ? Messages.ManageSetsDialog_1_SEARCH : (NLS.bind(Messages.ManageSetsDialog_N_SEARCHES, counter[2]))).append(", "); //$NON-NLS-1$ if (counter[3] > 0) itemBuilder.append(counter[3] == 1 ? Messages.ManageSetsDialog_1_BIN : (NLS.bind(Messages.ManageSetsDialog_N_BINS, counter[3]))).append(", "); //$NON-NLS-1$ /* Set is Empty */ if (counter[0] == 0 && counter[1] == 0 && counter[2] == 0 && counter[3] == 0) itemBuilder = new StringBuilder(Messages.ManageSetsDialog_EMPTY_SET); else if (itemBuilder.length() > 0) itemBuilder.delete(itemBuilder.length() - 2, itemBuilder.length()); fStatusLabel.setText( NLS.bind(Messages.ManageSetsDialog_SET_CONTENT, bookmarkSet.getName(), itemBuilder.toString())); } } private void count(IFolder folder, int[] counter) { /* Count Marks */ List<IMark> marks = folder.getMarks(); for (IMark mark : marks) { if (mark instanceof IBookMark) counter[1]++; else if (mark instanceof ISearchMark) counter[2]++; else if (mark instanceof INewsBin) counter[3]++; } /* Count in Sub-Folders */ List<IFolder> childs = folder.getFolders(); counter[0] += childs.size(); for (IFolder child : childs) count(child, counter); } }