| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.custom; |
| |
| |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.widgets.*; |
| |
| /** |
| * |
| * A TableEditor is a manager for a Control that appears above a cell in a Table and tracks with the |
| * moving and resizing of that cell. It can be used to display a text widget above a cell |
| * in a Table so that the user can edit the contents of that cell. It can also be used to display |
| * a button that can launch a dialog for modifying the contents of the associated cell. |
| * |
| * <p> Here is an example of using a TableEditor: |
| * <code><pre> |
| * Table table = new Table(parent, SWT.FULL_SELECTION); |
| * TableEditor editor = new TableEditor (table); |
| * table.addSelectionListener (new SelectionAdapter() { |
| * public void widgetSelected(SelectionEvent e) { |
| * |
| * // Clean up any previous editor control |
| * Control oldEditor = editor.getEditor(); |
| * if (oldEditor != null) |
| * oldEditor.dispose(); |
| * |
| * // Identify the selected row |
| * int index = table.getSelectionIndex (); |
| * if (index == -1) return; |
| * TableItem item = table.getItem (index); |
| * |
| * // The control that will be the editor must be a child of the Table |
| * Text text = new Text(table, SWT.NONE); |
| * |
| * //The text editor must have the same size as the cell and must |
| * //not be any smaller than 50 pixels. |
| * editor.horizontalAlignment = SWT.LEFT; |
| * editor.grabHorizontal = true; |
| * editor.minimumWidth = 50; |
| * |
| * // Open the text editor in the second column of the selected row. |
| * editor.setEditor (text, item, 1); |
| * |
| * // Assign focus to the text control |
| * text.setFocus (); |
| * } |
| * }); |
| * </pre></code> |
| */ |
| public class TableEditor extends ControlEditor { |
| |
| Table table; |
| TableItem item; |
| int column = -1; |
| Listener columnListener; |
| /** |
| * Creates a TableEditor for the specified Table. |
| * |
| * @param table the Table Control above which this editor will be displayed |
| * |
| */ |
| public TableEditor (Table table) { |
| super(table); |
| this.table = table; |
| |
| columnListener = new Listener() { |
| public void handleEvent(Event e) { |
| resize (); |
| } |
| }; |
| |
| } |
| Rectangle computeBounds () { |
| if (item == null || column == -1 || item.isDisposed()) return new Rectangle(0, 0, 0, 0); |
| |
| Rectangle cell = item.getBounds(column); |
| Rectangle editorRect = new Rectangle(cell.x, cell.y, minimumWidth, cell.height); |
| Rectangle area = table.getClientArea(); |
| if (cell.x < area.x + area.width) { |
| if (cell.x + cell.width > area.x + area.width) { |
| cell.width = area.width - cell.x; |
| } |
| } |
| |
| if (grabHorizontal){ |
| editorRect.width = Math.max(cell.width, minimumWidth); |
| } |
| |
| if (horizontalAlignment == SWT.RIGHT) { |
| editorRect.x += cell.width - editorRect.width; |
| } else if (horizontalAlignment == SWT.LEFT) { |
| // do nothing - cell.x is the right answer |
| } else { // default is CENTER |
| editorRect.x += (cell.width - editorRect.width)/2; |
| } |
| |
| return editorRect; |
| } |
| /** |
| * Removes all associations between the TableEditor and the cell in the table. The |
| * Table and the editor Control are <b>not</b> disposed. |
| */ |
| public void dispose () { |
| |
| if (this.column > -1 && this.column < table.getColumnCount()){ |
| TableColumn tableColumn = table.getColumn(this.column); |
| tableColumn.removeListener(SWT.Resize, columnListener); |
| tableColumn.removeListener(SWT.Move, columnListener); |
| } |
| columnListener = null; |
| table = null; |
| item = null; |
| column = -1; |
| |
| super.dispose(); |
| } |
| /** |
| * Returns the zero based index of the column of the cell being tracked by this editor. |
| * |
| * @return the zero based index of the column of the cell being tracked by this editor |
| */ |
| public int getColumn () { |
| return column; |
| } |
| /** |
| * Returns the TableItem for the row of the cell being tracked by this editor. |
| * |
| * @return the TableItem for the row of the cell being tracked by this editor |
| */ |
| public TableItem getItem () { |
| return item; |
| } |
| public void setColumn(int column) { |
| |
| int columnCount = table.getColumnCount(); |
| // Separately handle the case where the table has no TableColumns. |
| // In this situation, there is a single default column. |
| if (columnCount == 0) { |
| this.column = (column == 0) ? 0 : -1; |
| resize(); |
| return; |
| } |
| |
| if (this.column > -1 && this.column < columnCount){ |
| TableColumn tableColumn = table.getColumn(this.column); |
| tableColumn.removeListener(SWT.Resize, columnListener); |
| tableColumn.removeListener(SWT.Move, columnListener); |
| this.column = -1; |
| } |
| |
| if (column < 0 || column >= table.getColumnCount()) return; |
| |
| this.column = column; |
| TableColumn tableColumn = table.getColumn(this.column); |
| tableColumn.addListener(SWT.Resize, columnListener); |
| tableColumn.addListener(SWT.Move, columnListener); |
| resize(); |
| } |
| public void setItem (TableItem item) { |
| this.item = item; |
| resize(); |
| } |
| |
| /** |
| * Specify the Control that is to be displayed and the cell in the table that it is to be positioned above. |
| * |
| * <p>Note: The Control provided as the editor <b>must</b> be created with its parent being the Table control |
| * specified in the TableEditor constructor. |
| * |
| * @param editor the Control that is displayed above the cell being edited |
| * @param item the TableItem for the row of the cell being tracked by this editor |
| * @param column the zero based index of the column of the cell being tracked by this editor |
| */ |
| public void setEditor (Control editor, TableItem item, int column) { |
| setItem(item); |
| setColumn(column); |
| setEditor(editor); |
| } |
| void resize () { |
| if (table.isDisposed()) return; |
| if (item == null || item.isDisposed()) return; |
| int columnCount = table.getColumnCount(); |
| if (columnCount == 0 && column != 0) return; |
| if (columnCount > 0 && (column < 0 || column >= columnCount)) return; |
| super.resize(); |
| } |
| } |