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package org.eclipse.swt.custom;
/*
* Copyright (c) 2000, 2002 IBM Corp. All rights reserved.
* This file is 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
*/
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.events.*;
/**
*
* A TableTreeEditor is a manager for a Control that appears above a cell in a TableTree
* and tracks with the moving and resizing of that cell. It can be used to display a
* text widget above a cell in a TableTree 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 TableTreeEditor:
* <code><pre>
* public static void main (String [] args) {
* Display display = new Display ();
* Shell shell = new Shell (display);
* final TableTree tableTree = new TableTree(shell, SWT.FULL_SELECTION);
* Table table = tableTree.getTable();
* table.setLinesVisible(true);
* TableColumn column1 = new TableColumn(table, SWT.NONE);
* column1.setText("column 1");
* TableColumn column2 = new TableColumn(table, SWT.NONE);
* column2.setText("column 2");
* for (int i = 0; i < 40; i++) {
* TableTreeItem item = new TableTreeItem(tableTree, SWT.NONE);
* item.setText(0, "table tree item"+i);
* item.setText(1, "value "+i);
* }
* column1.pack();
* column2.pack();
* final TableTreeEditor editor = new TableTreeEditor (tableTree);
* tableTree.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
* TableTreeItem[] selection = tableTree.getSelection();
* if (selection.length == 0) return;
* TableTreeItem item = selection[0];
* // The control that will be the editor must be a child of the Table
* // that underlies the TableTree
* Text text = new Text(tableTree.getTable(), SWT.NONE);
* //text.moveAbove(tableTree);
* //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 ();
* }
* });
* tableTree.setBounds(10, 10, 200, 400);
* shell.open ();
* while (!shell.isDisposed ()) {
* if (!display.readAndDispatch ()) display.sleep ();
* }
* display.dispose ();
* }
* </pre></code>
*/
public class TableTreeEditor extends ControlEditor {
TableTree tableTree;
TableTreeItem item;
int column = -1;
ControlListener columnListener;
TreeListener treeListener;
/**
* Creates a TableEditor for the specified Table.
*
* @param table the Table Control above which this editor will be displayed
*
*/
public TableTreeEditor (TableTree tableTree) {
super(tableTree.getTable());
this.tableTree = tableTree;
treeListener = new TreeListener () {
final Runnable runnable = new Runnable() {
public void run() {
if (TableTreeEditor.this.tableTree.isDisposed() || editor == null) return;
resize();
editor.setVisible(true);
}
};
public void treeCollapsed(TreeEvent e) {
if (editor == null) return;
editor.setVisible(false);
Display display = TableTreeEditor.this.tableTree.getDisplay();
display.asyncExec(runnable);
}
public void treeExpanded(TreeEvent e) {
if (editor == null) return;
editor.setVisible(false);
Display display = TableTreeEditor.this.tableTree.getDisplay();
display.asyncExec(runnable);
}
};
tableTree.addTreeListener(treeListener);
columnListener = new ControlListener() {
public void controlMoved(ControlEvent e){
resize ();
}
public void controlResized(ControlEvent e){
resize ();
}
};
}
Rectangle computeBounds () {
if (item == null || column == -1 || item.isDisposed() || item.tableItem == null) 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 = tableTree.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 (treeListener != null)
tableTree.removeTreeListener(treeListener);
treeListener = null;
Table table = tableTree.getTable();
if (this.column > -1 && this.column < table.getColumnCount()){
TableColumn tableColumn = table.getColumn(this.column);
tableColumn.removeControlListener(columnListener);
}
tableTree = 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;
}
public void setColumn(int column) {
Table table = tableTree.getTable();
if (this.column > -1 && this.column < table.getColumnCount()){
TableColumn tableColumn = table.getColumn(this.column);
tableColumn.removeControlListener(columnListener);
this.column = -1;
}
if (column < 0 || column >= table.getColumnCount()) return;
this.column = column;
TableColumn tableColumn = table.getColumn(this.column);
tableColumn.addControlListener(columnListener);
resize();
}
/**
* 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 TableTreeItem getItem () {
return item;
}
public void setItem (TableTreeItem 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, TableTreeItem item, int column) {
setItem(item);
setColumn(column);
super.setEditor(editor);
}
void resize () {
if (tableTree.isDisposed()) return;
if (item == null || item.isDisposed()) return;
Table table = tableTree.getTable();
if (column < 0 || column >= table.getColumnCount()) return;
super.resize();
}
}
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