List of usage examples for org.eclipse.swt.widgets Tree getItemHeight
public int getItemHeight()
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);/* w w w . j av a 2 s .c o 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: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);/*from w w w .j a v 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: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);/* ww w .ja va2 s . 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.Snippet221.java
static void Scroll(Tree tree, int x, int y) { TreeItem item = tree.getItem(new Point(x, y)); if (item == null) return;/*from w w w .ja va 2 s .co m*/ Rectangle area = tree.getClientArea(); int headerHeight = tree.getHeaderHeight(); int itemHeight = tree.getItemHeight(); TreeItem nextItem = null; if (y < area.y + headerHeight + 2 * itemHeight) { nextItem = PreviousItem(tree, item); } if (y > area.y + area.height - 2 * itemHeight) { nextItem = NextItem(tree, item); } if (nextItem != null) tree.showItem(nextItem); }