List of usage examples for org.eclipse.swt.widgets Tree computeSize
public Point computeSize(int wHint, int hHint)
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);// w ww . jav a 2 s .c o 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: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);// w w w.j a v a 2s . 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(); }
From source file:org.eclipse.swt.snippets.Snippet8.java
public static void main(String[] args) { final Display display = new Display(); final Shell shell = new Shell(display); shell.setText("Lazy Tree"); shell.setLayout(new FillLayout()); final Tree tree = new Tree(shell, SWT.BORDER); File[] roots = File.listRoots(); for (int i = 0; i < roots.length; i++) { TreeItem root = new TreeItem(tree, 0); root.setText(roots[i].toString()); root.setData(roots[i]);// w ww . ja v a 2 s. c o m new TreeItem(root, 0); } tree.addListener(SWT.Expand, event -> { final TreeItem root = (TreeItem) event.item; TreeItem[] items = root.getItems(); for (int i1 = 0; i1 < items.length; i1++) { if (items[i1].getData() != null) return; items[i1].dispose(); } File file = (File) root.getData(); File[] files = file.listFiles(); if (files == null) return; for (int i2 = 0; i2 < files.length; i2++) { TreeItem item = new TreeItem(root, 0); item.setText(files[i2].getName()); item.setData(files[i2]); if (files[i2].isDirectory()) { new TreeItem(item, 0); } } }); Point size = tree.computeSize(300, SWT.DEFAULT); int width = Math.max(300, size.x); int height = Math.max(300, size.y); shell.setSize(shell.computeSize(width, height)); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }
From source file:Snippet8.java
public static void main(String[] args) { final Display display = new Display(); final Shell shell = new Shell(display); shell.setText("Lazy Tree"); shell.setLayout(new FillLayout()); final Tree tree = new Tree(shell, SWT.BORDER); File[] roots = File.listRoots(); for (int i = 0; i < roots.length; i++) { TreeItem root = new TreeItem(tree, 0); root.setText(roots[i].toString()); root.setData(roots[i]);/*from w w w . ja va2 s . com*/ new TreeItem(root, 0); } tree.addListener(SWT.Expand, new Listener() { public void handleEvent(final Event event) { final TreeItem root = (TreeItem) event.item; TreeItem[] items = root.getItems(); for (int i = 0; i < items.length; i++) { if (items[i].getData() != null) return; items[i].dispose(); } File file = (File) root.getData(); File[] files = file.listFiles(); if (files == null) return; for (int i = 0; i < files.length; i++) { TreeItem item = new TreeItem(root, 0); item.setText(files[i].getName()); item.setData(files[i]); if (files[i].isDirectory()) { new TreeItem(item, 0); } } } }); Point size = tree.computeSize(300, SWT.DEFAULT); int width = Math.max(300, size.x); int height = Math.max(300, size.y); shell.setSize(shell.computeSize(width, height)); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }