List of usage examples for org.eclipse.swt.widgets Tree Tree
public Tree(Composite parent, int style)
From source file:org.eclipse.swt.snippets.Snippet226.java
public static void main(String[] args) { final Display display = new Display(); Shell shell = new Shell(display); shell.setText("Custom gradient selection for Tree"); shell.setLayout(new FillLayout()); final Tree tree = new Tree(shell, SWT.MULTI | SWT.FULL_SELECTION); tree.setHeaderVisible(true);//from www . java 2s . c o m tree.setLinesVisible(true); int columnCount = 4; for (int i = 0; i < columnCount; i++) { TreeColumn column = new TreeColumn(tree, SWT.NONE); column.setText("Column " + i); } int itemCount = 3; for (int i = 0; i < itemCount; i++) { TreeItem item1 = new TreeItem(tree, SWT.NONE); item1.setText("item " + i); for (int c = 1; c < columnCount; c++) { item1.setText(c, "item [" + i + "-" + c + "]"); } for (int j = 0; j < itemCount; j++) { TreeItem item2 = new TreeItem(item1, SWT.NONE); item2.setText("item [" + i + " " + j + "]"); for (int c = 1; c < columnCount; c++) { item2.setText(c, "item [" + i + " " + j + "-" + c + "]"); } for (int k = 0; k < itemCount; k++) { TreeItem item3 = new TreeItem(item2, SWT.NONE); item3.setText("item [" + i + " " + j + " " + k + "]"); for (int c = 1; c < columnCount; c++) { item3.setText(c, "item [" + i + " " + j + " " + k + "-" + c + "]"); } } } } /* * NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly. * Therefore, it is critical for performance that these methods be * as efficient as possible. */ tree.addListener(SWT.EraseItem, event -> { event.detail &= ~SWT.HOT; if ((event.detail & SWT.SELECTED) != 0) { GC gc = event.gc; Rectangle area = tree.getClientArea(); /* * If you wish to paint the selection beyond the end of * last column, you must change the clipping region. */ int columnCount1 = tree.getColumnCount(); if (event.index == columnCount1 - 1 || columnCount1 == 0) { int width = area.x + area.width - event.x; if (width > 0) { Region region = new Region(); gc.getClipping(region); region.add(event.x, event.y, width, event.height); gc.setClipping(region); region.dispose(); } } gc.setAdvanced(true); if (gc.getAdvanced()) gc.setAlpha(127); Rectangle rect = event.getBounds(); Color foreground = gc.getForeground(); Color background = gc.getBackground(); gc.setForeground(display.getSystemColor(SWT.COLOR_RED)); gc.setBackground(display.getSystemColor(SWT.COLOR_LIST_BACKGROUND)); gc.fillGradientRectangle(0, rect.y, 500, rect.height, false); // restore colors for subsequent drawing gc.setForeground(foreground); gc.setBackground(background); event.detail &= ~SWT.SELECTED; } }); for (int i = 0; i < columnCount; i++) { tree.getColumn(i).pack(); } tree.setSelection(tree.getItem(0)); shell.setSize(500, 200); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }
From source file:org.eclipse.swt.snippets.Snippet227.java
public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setText("Multiple lines in a TreeItem"); shell.setLayout(new FillLayout()); final Tree tree = new Tree(shell, SWT.MULTI | SWT.FULL_SELECTION); tree.setHeaderVisible(true);/*from ww w .j a v a 2s.com*/ tree.setLinesVisible(true); int columnCount = 4; for (int i = 0; i < columnCount; i++) { TreeColumn column = new TreeColumn(tree, SWT.NONE); column.setText("Column " + i); column.setWidth(100); } int itemCount = 3; for (int i = 0; i < itemCount; i++) { TreeItem item1 = new TreeItem(tree, SWT.NONE); item1.setText("item " + i); for (int c = 1; c < columnCount; c++) { item1.setText(c, "item [" + i + "-" + c + "]"); } for (int j = 0; j < itemCount; j++) { TreeItem item2 = new TreeItem(item1, SWT.NONE); item2.setText("item [" + i + " " + j + "]"); for (int c = 1; c < columnCount; c++) { item2.setText(c, "item [" + i + " " + j + "-" + c + "]"); } for (int k = 0; k < itemCount; k++) { TreeItem item3 = new TreeItem(item2, SWT.NONE); item3.setText("item [" + i + " " + j + " " + k + "]"); for (int c = 1; c < columnCount; c++) { item3.setText(c, "item [" + i + " " + j + " " + k + "-" + c + "]"); } } } } /* * NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly. * Therefore, it is critical for performance that these methods be * as efficient as possible. */ Listener paintListener = new Listener() { @Override public void handleEvent(Event event) { switch (event.type) { case SWT.MeasureItem: { TreeItem item = (TreeItem) event.item; String text = getText(item, event.index); Point size = event.gc.textExtent(text); event.width = size.x; event.height = Math.max(event.height, size.y); break; } case SWT.PaintItem: { TreeItem item = (TreeItem) event.item; String text = getText(item, event.index); Point size = event.gc.textExtent(text); int offset2 = event.index == 0 ? Math.max(0, (event.height - size.y) / 2) : 0; event.gc.drawText(text, event.x, event.y + offset2, true); break; } case SWT.EraseItem: { event.detail &= ~SWT.FOREGROUND; break; } } } String getText(TreeItem item, int column) { String text = item.getText(column); if (column != 0) { TreeItem parent = item.getParentItem(); int index = parent == null ? tree.indexOf(item) : parent.indexOf(item); if ((index + column) % 3 == 1) { text += "\nnew line"; } if ((index + column) % 3 == 2) { text += "\nnew line\nnew line"; } } return text; } }; tree.addListener(SWT.MeasureItem, paintListener); tree.addListener(SWT.PaintItem, paintListener); tree.addListener(SWT.EraseItem, paintListener); shell.setSize(600, 400); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }
From source file:org.eclipse.swt.snippets.Snippet266.java
public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setText("Snippet 266"); shell.setLayout(new GridLayout(2, true)); TabFolder tabFolder = new TabFolder(shell, SWT.NONE); tabFolder.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 2, 1)); TabItem item = new TabItem(tabFolder, SWT.NONE); item.setText("Widget"); Composite composite = new Composite(tabFolder, SWT.NONE); composite.setLayout(new GridLayout()); Tree tree = new Tree(composite, SWT.BORDER); item.setControl(composite);//from ww w . j a va 2 s . co m tree.setHeaderVisible(true); tree.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); TreeColumn column1 = new TreeColumn(tree, SWT.NONE); column1.setText("Standard"); TreeColumn column2 = new TreeColumn(tree, SWT.NONE); column2.setText("Widget"); TreeItem branch = new TreeItem(tree, SWT.NONE); branch.setText(new String[] { "Efficient", "Portable" }); TreeItem leaf = new TreeItem(branch, SWT.NONE); leaf.setText(new String[] { "Cross", "Platform" }); branch.setExpanded(true); branch = new TreeItem(tree, SWT.NONE); branch.setText(new String[] { "Native", "Controls" }); leaf = new TreeItem(branch, SWT.NONE); leaf.setText(new String[] { "Cross", "Platform" }); branch = new TreeItem(tree, SWT.NONE); branch.setText(new String[] { "Cross", "Platform" }); column1.pack(); column2.pack(); item = new TabItem(tabFolder, SWT.NONE); item.setText("Toolkit"); Button button = new Button(shell, SWT.CHECK); button.setText("Totally"); button.setSelection(true); button.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, false, false)); button = new Button(shell, SWT.PUSH); button.setText("Awesome"); button.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, false, false)); shell.pack(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }
From source file:TreeItemLines.java
public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setText("Multiple lines in a TreeItem"); shell.setLayout(new FillLayout()); final Tree tree = new Tree(shell, SWT.MULTI | SWT.FULL_SELECTION); tree.setHeaderVisible(true);// w w w . j a va 2 s. co m tree.setLinesVisible(true); int columnCount = 4; for (int i = 0; i < columnCount; i++) { TreeColumn column = new TreeColumn(tree, SWT.NONE); column.setText("Column " + i); column.setWidth(100); } int itemCount = 3; for (int i = 0; i < itemCount; i++) { TreeItem item1 = new TreeItem(tree, SWT.NONE); item1.setText("item " + i); for (int c = 1; c < columnCount; c++) { item1.setText(c, "item [" + i + "-" + c + "]"); } for (int j = 0; j < itemCount; j++) { TreeItem item2 = new TreeItem(item1, SWT.NONE); item2.setText("item [" + i + " " + j + "]"); for (int c = 1; c < columnCount; c++) { item2.setText(c, "item [" + i + " " + j + "-" + c + "]"); } for (int k = 0; k < itemCount; k++) { TreeItem item3 = new TreeItem(item2, SWT.NONE); item3.setText("item [" + i + " " + j + " " + k + "]"); for (int c = 1; c < columnCount; c++) { item3.setText(c, "item [" + i + " " + j + " " + k + "-" + c + "]"); } } } } /* * NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly. * Therefore, it is critical for performance that these methods be as * efficient as possible. */ Listener paintListener = new Listener() { public void handleEvent(Event event) { switch (event.type) { case SWT.MeasureItem: { TreeItem item = (TreeItem) event.item; String text = getText(item, event.index); Point size = event.gc.textExtent(text); event.width = size.x; event.height = Math.max(event.height, size.y); break; } case SWT.PaintItem: { TreeItem item = (TreeItem) event.item; String text = getText(item, event.index); Point size = event.gc.textExtent(text); int offset2 = event.index == 0 ? Math.max(0, (event.height - size.y) / 2) : 0; event.gc.drawText(text, event.x, event.y + offset2, true); break; } case SWT.EraseItem: { event.detail &= ~SWT.FOREGROUND; break; } } } String getText(TreeItem item, int column) { String text = item.getText(column); if (column != 0) { TreeItem parent = item.getParentItem(); int index = parent == null ? tree.indexOf(item) : parent.indexOf(item); if ((index + column) % 3 == 1) { text += "\nnew line"; } if ((index + column) % 3 == 2) { text += "\nnew line\nnew line"; } } return text; } }; tree.addListener(SWT.MeasureItem, paintListener); tree.addListener(SWT.PaintItem, paintListener); tree.addListener(SWT.EraseItem, paintListener); shell.setSize(600, 400); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }
From source file:org.eclipse.swt.snippets.Snippet296.java
public static void main(String[] args) { final Display display = new Display(); Shell shell = new Shell(display); shell.setText("Snippet 296"); shell.setBounds(10, 10, 300, 300);// www .j av a 2 s . co m final ScrolledComposite sc = new ScrolledComposite(shell, SWT.VERTICAL); sc.setBounds(10, 10, 280, 200); final int clientWidth = sc.getClientArea().width; final Tree tree = new Tree(sc, SWT.NONE); for (int i = 0; i < 99; i++) { TreeItem item = new TreeItem(tree, SWT.NONE); item.setText("item " + i); new TreeItem(item, SWT.NONE).setText("child"); } sc.setContent(tree); int prefHeight = tree.computeSize(SWT.DEFAULT, SWT.DEFAULT).y; tree.setSize(clientWidth, prefHeight); /* * The following listener ensures that the Tree is always large * enough to not need to show its own vertical scrollbar. */ tree.addTreeListener(new TreeListener() { @Override public void treeExpanded(TreeEvent e) { int prefHeight = tree.computeSize(SWT.DEFAULT, SWT.DEFAULT).y; tree.setSize(clientWidth, prefHeight); } @Override public void treeCollapsed(TreeEvent e) { int prefHeight = tree.computeSize(SWT.DEFAULT, SWT.DEFAULT).y; tree.setSize(clientWidth, prefHeight); } }); /* * The following listener ensures that a newly-selected item * in the Tree is always visible. */ tree.addSelectionListener(widgetSelectedAdapter(e -> { TreeItem[] selectedItems = tree.getSelection(); if (selectedItems.length > 0) { Rectangle itemRect = selectedItems[0].getBounds(); Rectangle area = sc.getClientArea(); Point origin = sc.getOrigin(); if (itemRect.x < origin.x || itemRect.y < origin.y || itemRect.x + itemRect.width > origin.x + area.width || itemRect.y + itemRect.height > origin.y + area.height) { sc.setOrigin(itemRect.x, itemRect.y); } } })); /* * The following listener scrolls the Tree one item at a time * in response to MouseWheel events. */ tree.addListener(SWT.MouseWheel, event -> { Point origin = sc.getOrigin(); if (event.count < 0) { origin.y = Math.min(origin.y + tree.getItemHeight(), tree.getSize().y); } else { origin.y = Math.max(origin.y - tree.getItemHeight(), 0); } sc.setOrigin(origin); }); Button downButton = new Button(shell, SWT.PUSH); downButton.setBounds(10, 220, 120, 30); downButton.setText("Down 10px"); downButton.addListener(SWT.Selection, event -> sc.setOrigin(0, sc.getOrigin().y + 10)); Button upButton = new Button(shell, SWT.PUSH); upButton.setBounds(140, 220, 120, 30); upButton.setText("Up 10px"); upButton.addListener(SWT.Selection, event -> sc.setOrigin(0, sc.getOrigin().y - 10)); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }
From source file:TreeTableBarChart.java
public static void main(String[] args) { final Display display = new Display(); Shell shell = new Shell(display); shell.setLayout(new FillLayout()); shell.setText("Show results as a bar chart in Tree"); final Tree tree = new Tree(shell, SWT.BORDER); tree.setHeaderVisible(true);//from w w w . j a v a2 s .com tree.setLinesVisible(true); TreeColumn column1 = new TreeColumn(tree, SWT.NONE); column1.setText("Bug Status"); column1.setWidth(100); final TreeColumn column2 = new TreeColumn(tree, SWT.NONE); column2.setText("Percent"); column2.setWidth(200); String[] states = new String[] { "Resolved", "New", "Won't Fix", "Invalid" }; String[] teams = new String[] { "UI", "SWT", "OSGI" }; for (int i = 0; i < teams.length; i++) { TreeItem item = new TreeItem(tree, SWT.NONE); item.setText(teams[i]); for (int j = 0; j < states.length; j++) { TreeItem subItem = new TreeItem(item, SWT.NONE); subItem.setText(states[j]); } } /* * NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly. * Therefore, it is critical for performance that these methods be as * efficient as possible. */ tree.addListener(SWT.PaintItem, new Listener() { int[] percents = new int[] { 50, 30, 5, 15 }; public void handleEvent(Event event) { if (event.index == 1) { TreeItem item = (TreeItem) event.item; TreeItem parent = item.getParentItem(); if (parent != null) { GC gc = event.gc; int index = parent.indexOf(item); int percent = percents[index]; Color foreground = gc.getForeground(); Color background = gc.getBackground(); gc.setForeground(display.getSystemColor(SWT.COLOR_RED)); gc.setBackground(display.getSystemColor(SWT.COLOR_YELLOW)); int width = (column2.getWidth() - 1) * percent / 100; gc.fillGradientRectangle(event.x, event.y, width, event.height, true); Rectangle rect2 = new Rectangle(event.x, event.y, width - 1, event.height - 1); gc.drawRectangle(rect2); gc.setForeground(display.getSystemColor(SWT.COLOR_LIST_FOREGROUND)); String text = percent + "%"; Point size = event.gc.textExtent(text); int offset = Math.max(0, (event.height - size.y) / 2); gc.drawText(text, event.x + 2, event.y + offset, true); gc.setForeground(background); gc.setBackground(foreground); } } } }); shell.pack(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }
From source file:org.eclipse.swt.snippets.Snippet220.java
public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setText("Snippet 220"); shell.setBounds(10, 10, 350, 200);/*from ww w . j a va 2 s.co m*/ Image xImage = new Image(display, 16, 16); GC gc = new GC(xImage); gc.setForeground(display.getSystemColor(SWT.COLOR_RED)); gc.drawLine(1, 1, 14, 14); gc.drawLine(1, 14, 14, 1); gc.drawOval(2, 2, 11, 11); gc.dispose(); final int IMAGE_MARGIN = 2; final Tree tree = new Tree(shell, SWT.CHECK); tree.setBounds(10, 10, 300, 150); TreeItem item = new TreeItem(tree, SWT.NONE); item.setText("root item"); for (int i = 0; i < 4; i++) { TreeItem newItem = new TreeItem(item, SWT.NONE); newItem.setText("descendent " + i); if (i % 2 == 0) newItem.setData(xImage); item.setExpanded(true); item = newItem; } /* * NOTE: MeasureItem and PaintItem are called repeatedly. Therefore it is * critical for performance that these methods be as efficient as possible. */ tree.addListener(SWT.MeasureItem, event -> { TreeItem item1 = (TreeItem) event.item; Image trailingImage = (Image) item1.getData(); if (trailingImage != null) { event.width += trailingImage.getBounds().width + IMAGE_MARGIN; } }); tree.addListener(SWT.PaintItem, event -> { TreeItem item1 = (TreeItem) event.item; Image trailingImage = (Image) item1.getData(); if (trailingImage != null) { int x = event.x + event.width + IMAGE_MARGIN; int itemHeight = tree.getItemHeight(); int imageHeight = trailingImage.getBounds().height; int y = event.y + (itemHeight - imageHeight) / 2; event.gc.drawImage(trailingImage, x, y); } }); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } xImage.dispose(); display.dispose(); }
From source file:TreeEventMeasurePaintErase.java
public static void main(String[] args) { Display display = new Display(); final Image image = display.getSystemImage(SWT.ICON_INFORMATION); Shell shell = new Shell(display); shell.setText("Images on the right side of the TreeItem"); shell.setLayout(new FillLayout()); Tree tree = new Tree(shell, SWT.MULTI | SWT.FULL_SELECTION); tree.setHeaderVisible(true);/*ww w .j a v a 2s . com*/ tree.setLinesVisible(true); int columnCount = 4; for (int i = 0; i < columnCount; i++) { TreeColumn column = new TreeColumn(tree, SWT.NONE); column.setText("Column " + i); } int itemCount = 3; for (int i = 0; i < itemCount; i++) { TreeItem item1 = new TreeItem(tree, SWT.NONE); item1.setText("item " + i); for (int c = 1; c < columnCount; c++) { item1.setText(c, "item [" + i + "-" + c + "]"); } for (int j = 0; j < itemCount; j++) { TreeItem item2 = new TreeItem(item1, SWT.NONE); item2.setText("item [" + i + " " + j + "]"); for (int c = 1; c < columnCount; c++) { item2.setText(c, "item [" + i + " " + j + "-" + c + "]"); } for (int k = 0; k < itemCount; k++) { TreeItem item3 = new TreeItem(item2, SWT.NONE); item3.setText("item [" + i + " " + j + " " + k + "]"); for (int c = 1; c < columnCount; c++) { item3.setText(c, "item [" + i + " " + j + " " + k + "-" + c + "]"); } } } } /* * NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly. * Therefore, it is critical for performance that these methods be as * efficient as possible. */ Listener paintListener = new Listener() { public void handleEvent(Event event) { switch (event.type) { case SWT.MeasureItem: { Rectangle rect = image.getBounds(); event.width += rect.width; event.height = Math.max(event.height, rect.height + 2); break; } case SWT.PaintItem: { int x = event.x + event.width; Rectangle rect = image.getBounds(); int offset = Math.max(0, (event.height - rect.height) / 2); event.gc.drawImage(image, x, event.y + offset); break; } } } }; tree.addListener(SWT.MeasureItem, paintListener); tree.addListener(SWT.PaintItem, paintListener); for (int i = 0; i < columnCount; i++) { tree.getColumn(i).pack(); } shell.setSize(500, 200); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } if (image != null) image.dispose(); display.dispose(); }
From source file:TreeTableGradient.java
public static void main(String[] args) { final Display display = new Display(); Shell shell = new Shell(display); shell.setText("Custom gradient selection for Tree"); shell.setLayout(new FillLayout()); final Tree tree = new Tree(shell, SWT.MULTI | SWT.FULL_SELECTION); tree.setHeaderVisible(true);/*from w w w . j a v a2s . co m*/ tree.setLinesVisible(true); int columnCount = 4; for (int i = 0; i < columnCount; i++) { TreeColumn column = new TreeColumn(tree, SWT.NONE); column.setText("Column " + i); } int itemCount = 3; for (int i = 0; i < itemCount; i++) { TreeItem item1 = new TreeItem(tree, SWT.NONE); item1.setText("item " + i); for (int c = 1; c < columnCount; c++) { item1.setText(c, "item [" + i + "-" + c + "]"); } for (int j = 0; j < itemCount; j++) { TreeItem item2 = new TreeItem(item1, SWT.NONE); item2.setText("item [" + i + " " + j + "]"); for (int c = 1; c < columnCount; c++) { item2.setText(c, "item [" + i + " " + j + "-" + c + "]"); } for (int k = 0; k < itemCount; k++) { TreeItem item3 = new TreeItem(item2, SWT.NONE); item3.setText("item [" + i + " " + j + " " + k + "]"); for (int c = 1; c < columnCount; c++) { item3.setText(c, "item [" + i + " " + j + " " + k + "-" + c + "]"); } } } } /* * NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly. * Therefore, it is critical for performance that these methods be as * efficient as possible. */ tree.addListener(SWT.EraseItem, new Listener() { public void handleEvent(Event event) { if ((event.detail & SWT.SELECTED) != 0) { GC gc = event.gc; Rectangle area = tree.getClientArea(); /* * If you wish to paint the selection beyond the end of last column, * you must change the clipping region. */ int columnCount = tree.getColumnCount(); if (event.index == columnCount - 1 || columnCount == 0) { int width = area.x + area.width - event.x; if (width > 0) { Region region = new Region(); gc.getClipping(region); region.add(event.x, event.y, width, event.height); gc.setClipping(region); region.dispose(); } } gc.setAdvanced(true); if (gc.getAdvanced()) gc.setAlpha(127); Rectangle rect = event.getBounds(); Color foreground = gc.getForeground(); Color background = gc.getBackground(); gc.setForeground(display.getSystemColor(SWT.COLOR_RED)); gc.setBackground(display.getSystemColor(SWT.COLOR_LIST_BACKGROUND)); gc.fillGradientRectangle(0, rect.y, 500, rect.height, false); // restore colors for subsequent drawing gc.setForeground(foreground); gc.setBackground(background); event.detail &= ~SWT.SELECTED; } } }); for (int i = 0; i < columnCount; i++) { tree.getColumn(i).pack(); } tree.setSelection(tree.getItem(0)); shell.setSize(500, 200); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }
From source file:org.eclipse.swt.snippets.Snippet322.java
public static void main(String[] args) { final Display display = new Display(); Shell shell = new Shell(display); shell.setText("Snippet 322"); shell.setBounds(10, 10, 300, 300);// www. j a v a2s. c om final ScrolledComposite sc = new ScrolledComposite(shell, SWT.VERTICAL); sc.setBounds(10, 10, 280, 200); final int clientWidth = sc.getClientArea().width; final Tree tree = new Tree(sc, SWT.NONE); for (int i = 0; i < 99; i++) { TreeItem item = new TreeItem(tree, SWT.NONE); item.setText("item " + i); new TreeItem(item, SWT.NONE).setText("child"); } sc.setContent(tree); int prefHeight = tree.computeSize(SWT.DEFAULT, SWT.DEFAULT).y; tree.setSize(clientWidth, prefHeight); /* * The following listener ensures that the Tree is always large * enough to not need to show its own vertical scrollbar. */ tree.addTreeListener(new TreeListener() { @Override public void treeExpanded(TreeEvent e) { int prefHeight = tree.computeSize(SWT.DEFAULT, SWT.DEFAULT).y; tree.setSize(clientWidth, prefHeight); } @Override public void treeCollapsed(TreeEvent e) { int prefHeight = tree.computeSize(SWT.DEFAULT, SWT.DEFAULT).y; tree.setSize(clientWidth, prefHeight); } }); /* * The following listener ensures that a newly-selected item * in the Tree is always visible. */ tree.addSelectionListener(widgetSelectedAdapter(e -> { TreeItem[] selectedItems = tree.getSelection(); if (selectedItems.length > 0) { Rectangle itemRect = selectedItems[0].getBounds(); Rectangle area = sc.getClientArea(); Point origin = sc.getOrigin(); if (itemRect.x < origin.x || itemRect.y < origin.y || itemRect.x + itemRect.width > origin.x + area.width || itemRect.y + itemRect.height > origin.y + area.height) { sc.setOrigin(itemRect.x, itemRect.y); } } })); /* * The following listener scrolls the Tree one item at a time * in response to MouseWheel events. */ tree.addListener(SWT.MouseWheel, event -> { Point origin = sc.getOrigin(); if (event.count < 0) { origin.y = Math.min(origin.y + tree.getItemHeight(), tree.getSize().y); } else { origin.y = Math.max(origin.y - tree.getItemHeight(), 0); } sc.setOrigin(origin); }); Button disableButton = new Button(shell, SWT.PUSH); disableButton.setBounds(10, 220, 120, 30); disableButton.setText("Disable"); disableButton.addListener(SWT.Selection, event -> tree.setEnabled(false)); Button enableButton = new Button(shell, SWT.PUSH); enableButton.setBounds(140, 220, 120, 30); enableButton.setText("Enable"); enableButton.addListener(SWT.Selection, event -> tree.setEnabled(true)); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }