List of usage examples for org.eclipse.swt.widgets Tree getTopItem
public TreeItem getTopItem()
From source file:org.eclipse.swt.snippets.Snippet254.java
public static void main(String[] args) { final Display display = new Display(); final Shell shell = new Shell(display); shell.setText("Snippet 254"); RowLayout layout = new RowLayout(SWT.VERTICAL); layout.fill = true;//from w ww . j av a 2 s . c om layout.wrap = false; shell.setLayout(layout); final Tree tree = new Tree(shell, SWT.NONE); for (int i = 0; i < 32; i++) { TreeItem item0 = new TreeItem(tree, SWT.NONE); item0.setText("Item " + i + " is quite long"); for (int j = 0; j < 3; j++) { TreeItem item1 = new TreeItem(item0, SWT.NONE); item1.setText("Item " + i + " " + j + " is quite long"); for (int k = 0; k < 3; k++) { TreeItem item2 = new TreeItem(item1, SWT.NONE); item2.setText("Item " + i + " " + j + " " + k + " is quite long"); for (int l = 0; l < 3; l++) { TreeItem item3 = new TreeItem(item2, SWT.NONE); item3.setText("Item " + i + " " + j + " " + k + " " + l + " is quite long"); } } } } tree.setLayoutData(new RowData(200, 200)); final Button button = new Button(shell, SWT.PUSH); button.setText("Visible Items []"); button.addListener(SWT.Selection, e -> { int visibleCount = 0; Rectangle rect = tree.getClientArea(); TreeItem item = tree.getTopItem(); while (item != null) { visibleCount++; Rectangle itemRect = item.getBounds(); if (itemRect.y + itemRect.height > rect.y + rect.height) { break; } item = nextItem(tree, item); } button.setText("Visible Items [" + visibleCount + "]"); }); shell.pack(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }
From source file:org.eclipse.swt.snippets.Snippet360.java
public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setText("Snippet 360"); shell.setLayout(new GridLayout()); // create a a tree with 3 columns and fill with data final Tree tree = new Tree(shell, SWT.BORDER | SWT.MULTI | SWT.FULL_SELECTION); tree.setLayoutData(new GridData(GridData.FILL_BOTH)); tree.setHeaderVisible(true);/*from w w w . jav a 2 s. com*/ TreeColumn column1 = new TreeColumn(tree, SWT.NONE); TreeColumn column2 = new TreeColumn(tree, SWT.NONE); TreeColumn column3 = new TreeColumn(tree, SWT.NONE); for (int i = 0; i < 9; i++) { TreeItem item = new TreeItem(tree, SWT.NONE); item.setText(new String[] { "root " + i + " 0", "root " + i + " 1", "root " + i + " 2" }); for (int j = 0; j < 9; j++) { TreeItem item2 = new TreeItem(item, SWT.NONE); item2.setText(new String[] { "child " + j + " 0", "child " + j + " 1", "child " + j + " 2" }); TreeItem current = item2; for (int k = 0; k < 5; k++) { TreeItem item3 = new TreeItem(current, SWT.NONE); item3.setText(new String[] { "descendent " + k + " 0", "descendent " + k + " 1", "descendent " + k + " 2" }); current = item3; } } } column1.setWidth(200); column2.setWidth(100); column3.setWidth(100); // create a TreeCursor to navigate around the tree final TreeCursor cursor = new TreeCursor(tree, SWT.NONE); // create an editor to edit the cell when the user hits "ENTER" // while over a cell in the tree final ControlEditor editor = new ControlEditor(cursor); editor.grabHorizontal = true; editor.grabVertical = true; cursor.addSelectionListener(new SelectionAdapter() { // when the TreeEditor is over a cell, select the corresponding row // in the tree @Override public void widgetSelected(SelectionEvent e) { tree.setSelection(new TreeItem[] { cursor.getRow() }); } // when the user hits "ENTER" in the TreeCursor, pop up a text // editor so that they can change the text of the cell @Override public void widgetDefaultSelected(SelectionEvent e) { final Text text = new Text(cursor, SWT.NONE); TreeItem row = cursor.getRow(); int column = cursor.getColumn(); text.setText(row.getText(column)); text.addKeyListener(keyPressedAdapter(event -> { // close the text editor and copy the data over // when the user hits "ENTER" if (event.character == SWT.CR) { TreeItem localRow = cursor.getRow(); int localColumn = cursor.getColumn(); localRow.setText(localColumn, text.getText()); text.dispose(); } // close the text editor when the user hits "ESC" if (event.character == SWT.ESC) { text.dispose(); } })); editor.setEditor(text); text.setFocus(); } }); // Hide the TreeCursor when the user hits the "MOD1" or "MOD2" key. // This allows the user to select multiple items in the tree. cursor.addKeyListener(keyPressedAdapter(e -> { if (e.keyCode == SWT.MOD1 || e.keyCode == SWT.MOD2 || (e.stateMask & SWT.MOD1) != 0 || (e.stateMask & SWT.MOD2) != 0) { cursor.setVisible(false); } })); // Show the TreeCursor when the user releases the "MOD2" or "MOD1" key. // This signals the end of the multiple selection task. tree.addKeyListener(new KeyListener() { @Override public void keyReleased(KeyEvent e) { if (e.keyCode == SWT.MOD1 && (e.stateMask & SWT.MOD2) != 0) return; if (e.keyCode == SWT.MOD2 && (e.stateMask & SWT.MOD1) != 0) return; if (e.keyCode != SWT.MOD1 && (e.stateMask & SWT.MOD1) != 0) return; if (e.keyCode != SWT.MOD2 && (e.stateMask & SWT.MOD2) != 0) return; TreeItem[] selection = tree.getSelection(); TreeItem row = (selection.length == 0) ? tree.getItem(tree.indexOf(tree.getTopItem())) : selection[0]; tree.showItem(row); cursor.setSelection(row, cursor.getColumn()); cursor.setVisible(true); cursor.setFocus(); } @Override public void keyPressed(KeyEvent e) { switch (e.keyCode) { case SWT.ARROW_LEFT: case SWT.ARROW_RIGHT: { if ((e.stateMask & SWT.MOD1) != 0) { TreeItem[] selection = tree.getSelection(); if (selection.length > 0) { selection[0].setExpanded(e.keyCode == SWT.ARROW_RIGHT); } break; } } } } }); shell.pack(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }