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Efficient Viewer Development with SWT/JFace Tools

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flaviar
34 diapositives · 392 Views · Nov 06, 2019

Learn to create, customize, and manage SWT/JFace viewers like ComboViewer, TableViewer, and ListViewer with proper content and label providers. Develop desired features and interactions seamlessly.

#efficient viewer development with swt/jface tools #efficient viewer development with swt/jface tools ppt #powerpoint #presentation
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Efficient Viewer Development with SWT/JFace Tools
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  1. Eclipse Plug-in Development SWT/JFace Development Part 4 Viewers Soyatec (http://www.soyatec.com)

  2. Contents • Introducing the JFace Viewers • Viewers in JFace • ComboViewer • ListViewer • TableViewer • Filter • Cell Editor • TreeViewer • Filter • Cell Editor Soyatec (http://www.soyatec.com)

  3. Viewers • Content provider • IStructuredContentProvider • List elements of domain • Controls • List • Combo • Table • ArrayContentProvider • Array • Collection • ITreeContentProvider • List children • Determine parent • Tree Soyatec (http://www.soyatec.com)

  4. Viewers • Label provider • ILabelProvider • Used for Lists and Trees • Defines icon and label for each element • CellLabelProvider • Used for Tables • Defines a label provider per column • ITableLabelProvider • Used for Tables • Provide the text and/or image for each column of a given element Soyatec (http://www.soyatec.com)

  5. Viewers • Input • Domain model • Null to clear contents Soyatec (http://www.soyatec.com)

  6. Viewer • Creating a Viewer • Initialize • Set content provider • Set label provider • Set input • Manage Selections • ISelectionChangeListener • IStructuredSelection • Set selection and reveal Soyatec (http://www.soyatec.com)

  7. Viewers • Custom a Viewer • create SWT controls for viewer (in constructor) (optional) • initialize SWT controls from input (inputChanged) • define viewer-specific update methods • support selections (setSelection, getSelection) Soyatec (http://www.soyatec.com)

  8. ComboViewer • Initialize • Default • With Combo or CCombo control • ComboViewerviewer1 = newComboViewer(parent, SWT.READ_ONLY); • CComboccombo = newCCombo(parent, SWT.READ_ONLY); • ComboViewer viewer2 = newComboViewer(ccombo); • Combo combo = new Combo(parent, SWT.READ_ONLY); • ComboViewer viewer3 = newComboViewer(combo); Soyatec (http://www.soyatec.com)

  9. ListViewer • Initialize • Default • With List control • ListViewer viewer1 = newListViewer(parent); • ListViewer viewer2 = newListViewer(parent, SWT.MULTI | SWT.BORDER); • List list = new List(parent, SWT.MULTI | SWT.BORDER); • ListViewer viewer3 = newListViewer(list); Soyatec (http://www.soyatec.com)

  10. TableViewer • Initialize • Default • With Table control • TableViewer viewer1 = newTableViewer(parent); • TableViewer viewer2 = newTableViewer(parent, SWT.FULL_SELECTION|SWT.BORDER); • Table table = new Table(parent, SWT.FULL_SELECTION|SWT.BORDER); • TableViewer viewer3 = newTableViewer(table); Soyatec (http://www.soyatec.com)

  11. Table Viewer • Domain model • Try to list all books for a library • Library library = new Library("Center Public Library"); • library.addBook(new Book("Children Education, 3-6 years old", • new Author("Ben Jermain", 34))); • library.addBook(new Book("Children Education, 6-12 years old", • new Author("Ben Jermain", 34))); • library.addBook(new Book("Baby Names Book", new Author("QuanJia", 56))); • library.addBook(new Book("Java Development", new Author("Van Jondon", • 43))); Soyatec (http://www.soyatec.com)

  12. Table Viewer • Content Provider • privatestaticclass MyContentProvicer1 implements • IStructuredContentProvider { • publicvoid dispose() { • } • publicvoidinputChanged(Viewer viewer, Object oldInput, Object newInput) { • } • publicObject[] getElements(Object inputElement) { • if(inputElementinstanceof Library) { • return((Library) inputElement).getBooks().toArray(); • } • returnnew Object[0]; • } • } Soyatec (http://www.soyatec.com)

  13. Table Viewer • Label provider • privatestaticclass MyLabelProvider1 extendsLabelProvider { • publicString getText(Object element) { • if(elementinstanceof Model) { • return((Model) element).getName(); • } • returnsuper.getText(element); • } • } Soyatec (http://www.soyatec.com)

  14. Table Viewer • Set Input • TableViewerviewer = newTableViewer(shell); • viewer.setContentProvider(new MyContentProvicer1()); • viewer.setLabelProvider(new MyLabelProvider1()); • viewer.setInput(library); Soyatec (http://www.soyatec.com)

  15. Table Viewer • Add columns • viewer.getTable().setHeaderVisible(true); • TableViewerColumnnameColumn = newTableViewerColumn(viewer, SWT.NONE); • nameColumn.getColumn().setText("Name"); • nameColumn.getColumn().setWidth(200); • TableViewerColumnauthorColumn = newTableViewerColumn(viewer, SWT.NONE); • authorColumn.getColumn().setText("Author"); • authorColumn.getColumn().setWidth(100); Soyatec (http://www.soyatec.com)

  16. Table Viewer • Update label provider for Author column • privatestaticclass MyLabelProvider2 extendsLabelProviderimplements • ITableLabelProvider { • publicImage getColumnImage(Object element, intcolumnIndex) { • returnnull; • } • publicString getColumnText(Object element, intcolumnIndex) { • if(elementinstanceof Book) { • if(columnIndex == 0) { • return((Book) element).getName(); • } elseif (columnIndex == 1) { • Author author = ((Book) element).getAuthor(); • if(author != null) { • returnauthor.getName(); • } • } • } • returnnull; • } • } • } Soyatec (http://www.soyatec.com)

  17. Table Viewer • CellLableProvider • ColumnLabelProvider • nameColumn.setLabelProvider(newColumnLabelProvider() { • publicString getText(Object element) { • if(elementinstanceof Book) { • return((Book) element).getName(); • } • returnsuper.getText(element); • } • publicColor getForeground(Object element) { • returndisplay.getSystemColor(SWT.COLOR_BLUE); • } • }); Soyatec (http://www.soyatec.com)

  18. Table Viewer • CellLabelProvider • ColumnLabelProvider • authorColumn.setLabelProvider(newColumnLabelProvider() { • publicString getText(Object element) { • if(elementinstanceof Book) { • Author author = ((Book) element).getAuthor(); • if(author != null) { • returnauthor.getName(); • } • } • returnsuper.getText(element); • } • publicColor getBackground(Object element) { • returndisplay.getSystemColor(SWT.COLOR_CYAN); • } • }); Soyatec (http://www.soyatec.com)

  19. Table Viewer • CellLabelProvider • OwnerDrawLabelProvider • viewer.setLabelProvider(newOwnerDrawLabelProvider() { • protectedvoid measure(Event event, Object element) { • LineEntryline = (LineEntry) element; • Point size = event.gc.textExtent(line.line); • event.width= viewer.getTable().getColumn(event.index).getWidth(); • intlines = size.x / event.width + 1; • event.height= size.y * lines; • } • protectedvoid paint(Event event, Object element) { • LineEntryentry = (LineEntry) element; • event.gc.drawText(entry.line, event.x, event.y, true); • } • }); Soyatec (http://www.soyatec.com)

  20. Table Viewer • Cell Editor • viewer.setColumnProperties(COLUMN_PROPERYIES); • viewer.setCellEditors(newCellEditor[] { • newTextCellEditor(viewer.getTable()), null}); • viewer.setCellModifier(newICellModifier() { • … • }); publicvoid modify(Object element, String property, Object value) { if(COLUMN_PROPERYIES[0].equals(property)) { if(elementinstanceofTableItem) { element= ((TableItem) element).getData(); } if(elementinstanceof Book) { ((Book) element).setName(value.toString()); } } viewer.update(element, new String[] { property }); } public Object getValue(Object element, String property) { if(COLUMN_PROPERYIES[0].equals(property)) { if(elementinstanceof Book) { return((Book) element).getName(); } } returnnull; } publicbooleancanModify(Object element, String property) { returnCOLUMN_PROPERYIES[0].equals(property); } Soyatec (http://www.soyatec.com)

  21. Table Viewer • Cell Editor with EditingSupport • SWT.FULL_SELECTION • authorColumn.setEditingSupport(newEditingSupport(viewer) { • … • }); protectedbooleancanEdit(Object element) { returntrue; } protectedCellEditorgetCellEditor(Object element) { returnnewDialogCellEditor(viewer.getTable()) { protectedObject openDialogBox(Control cellEditorWindow) { InputDialogdialog = newInputDialog(cellEditorWindow .getShell(), "Author Name", "Change the name of Author", (String) getValue(), null); dialog.open(); returndialog.getValue(); } }; } protectedvoidsetValue(Object element, Object value) { if(elementinstanceof Book) { Author author = ((Book) element).getAuthor(); if(author != null) { author.setName(value.toString()); } } viewer.update(element, null); } protected Object getValue(Object element) { if(elementinstanceof Book) { Author author = ((Book) element).getAuthor(); returnauthor.getName(); } returnnull; } Soyatec (http://www.soyatec.com)

  22. Table Viewer • CellEditors • TextCellEditor • ColorCellEditor • ComboBoxCellEditor • CheckboxCellEditor • DialogCellEditor Soyatec (http://www.soyatec.com)

  23. Table Viewer • ViewerFilter • viewer.addFilter(newViewerFilter() { • publicboolean select(Viewer viewer, Object parentElement, • Object element) { • if(elementinstanceof Book) { • Author author = ((Book) element).getAuthor(); • if(author != null && author.getAge() < 40) { • returnfalse; • } • } • returntrue; • } • }); Soyatec (http://www.soyatec.com)

  24. Table Viewer • ViewerComparator • viewer.getTable().setSortColumn(nameColumn.getColumn()); • nameColumn.getColumn().addSelectionListener(newSelectionAdapter() { • publicvoidwidgetSelected(SelectionEvente) { • viewer.setComparator(newViewerComparator() { • publicint compare(Viewer viewer, Object e1, Object e2) { • String n1 = ((Book) e1).getName(); • String n2 = ((Book) e2).getName(); • intvalue = Collator.getInstance().compare(n1, n2); • intsort = ((TableViewer) viewer).getTable() • .getSortDirection(); • if((sort & SWT.DOWN) != 0) { • return-value; • } elseif ((sort & SWT.UP) != 0) { • returnvalue; • } • return0; • } • }); • intsort = viewer.getTable().getSortDirection(); • viewer.getTable().setSortDirection( • (SWT.UP & sort) != 0 ? SWT.DOWN : SWT.UP); • } • }); Soyatec (http://www.soyatec.com)

  25. Table Viewer • Virtual Table & ILazyContentProvider • TableViewer viewer = new TableViewer(shell, SWT.VIRTUAL); • viewer.setContentProvider(new LazyContentProvider()); • viewer.setLabelProvider(new LabelProvider()); • String[] inputs = new String[100000]; • for (inti = 0; i < inputs.length; i++) { • inputs[i] = "Value " + i; • } • viewer.setItemCount(inputs.length); • viewer.setUseHashlookup(true); • viewer.setInput(inputs); privatestaticclassLazyContentProviderimplementsILazyContentProvider { privateTableViewerviewer; privateString[] elements; publicvoid dispose() { } publicvoidinputChanged(Viewer viewer, Object oldInput, Object newInput) { this.viewer= (TableViewer) viewer; elements= (String[]) newInput; } publicvoidupdateElement(intindex) { viewer.replace(elements[index], index); } } Soyatec (http://www.soyatec.com)

  26. Table Viewer • TableEditor • nameColumn.setLabelProvider(newCellLabelProvider() { • publicvoid update(ViewerCellcell) { • TableItemitem = (TableItem) cell.getItem(); • if(item.getData("EDITOR") != null) { • TableEditoreditor = (TableEditor) item.getData("EDITOR"); • editor.getEditor().dispose(); • editor.dispose(); • } • TableEditoreditor = newTableEditor(item.getParent()); • Composite control = new Composite(item.getParent(), SWT.NONE); • control.setBackground(item.getParent().getBackground()); • control.setBackgroundMode(SWT.INHERIT_DEFAULT); • RowLayoutlayout = newRowLayout(SWT.HORIZONTAL); • control.setLayout(layout); • Button button = new Button(control, SWT.RADIO); • button.setText(((Book) cell.getElement()).getName()); • editor.grabHorizontal= true; • editor.setEditor(control, item, 0); • item.setData("EDITOR", editor); • } • }); Soyatec (http://www.soyatec.com)

  27. TreeViewer • Initialize • Default • With Tree control • TreeViewer viewer1 = newTreeViewer(parent); • TreeViewer viewer2 = newTreeViewer(parent, SWT.FULL_SELECTION|SWT.BORDER); • Tree tree = new Tree(parent, SWT.FULL_SELECTION|SWT.BORDER); • TreeViewer viewer3 = newTreeViewer(tree); Soyatec (http://www.soyatec.com)

  28. TreeViewer • Content Provider • ITreeContentProvider public Object[] getChildren(Object parentElement) { if(parentElementinstanceof Library) { Set<Author> authors = authorMap.get(parentElement); if(authors == null) { authors= newHashSet<Author>(); List<Book> books = ((Library) parentElement).getBooks(); for(Book book : books) { Author author = book.getAuthor(); if(author == null) { continue; } authors.add(author); } authorMap.put((Library) parentElement, authors); } returnauthors.toArray(); } elseif (parentElementinstanceof Author) { return((Author) parentElement).getBooks().toArray(); } returnnew Object[0]; } public Object[] getElements(Object inputElement) { if(inputElementinstanceof List<?>) { return((List<?>) inputElement).toArray(); } returnnew Object[0]; } public Object getParent(Object element) { if(elementinstanceof Book) { return((Book) element).getAuthor(); } returnnull; } publicbooleanhasChildren(Object element) { returngetChildren(element).length != 0; } Soyatec (http://www.soyatec.com)

  29. Tree Viewer • Expand and Collapse • setAutoExpandLevel(int level) // 0, 1 … ALL_LEVELS • setExpandedElements(Object[] elements) • setExpandedState(Object elementOrTreePath, boolean expanded) • setExpandedTreePaths(TreePath[] treePaths) • setExpandPreCheckFilters(booleancheckFilters) • expandAll() • collapseAll() Soyatec (http://www.soyatec.com)

  30. TreeViewer • TreePath • ITreePathContentProvider • ITreePathLabelProvider Soyatec (http://www.soyatec.com)

  31. TreeViewer • Virtual Tree • ILazyTreeContentProvider • ILazyTreePathContentProvider Soyatec (http://www.soyatec.com)

  32. Column Viewer • ColumnViewerEditorActivationStrategy • FocusCellHighlighter • FocusCellOwnerDrawHighlighter • ColumnViewerToolTipSupport Soyatec (http://www.soyatec.com)

  33. Any Questions? Skype: jin.liu.soyatec Email: jin.liu@soyatec.com Soyatec (http://www.soyatec.com)

  34. The end Soyatec (http://www.soyatec.com)