在TableViewer或TreeViewer編輯時候，Eclipse提供了基本的CellEditor，如TextCellEditor、CheckboxCellEditor、ComboBoxCellEditor、DialogCellEditor等，但在實際應用過程中，我們通常有特殊需要，如下圖類型的單元格編輯器：
實現的方式相當簡單，我組合了ComboBoxCellEditor、DialogCellEditor，其中ComboBox支持手工輸入，返回為String類型值(原ComboBoxCellEditor為Integer類型)，貼下具體代碼吧：
package com.test.ui.properties.invoke;
import java.text.MessageFormat;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CCombo;
import org.eclipse.swt.events.FocusAdapter;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.FocusListener;
import org.eclipse.swt.events.KeyAdapter;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.TraverseEvent;
import org.eclipse.swt.events.TraverseListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Layout;
public abstract class ComboBoxDialogCellEditor extends CellEditor 
{
//Combo Items
private String[] items;
private Composite editor;
private CCombo comboBox;
private Control contents;
private Button button;
private FocusListener buttonFocusListener;
private ModifyListener modifyListener;
private Object value = null;
/** *//**
* Internal class for laying out the dialog.
*/
private class DialogCellLayout extends Layout {
public void layout(Composite editor, boolean force) {
Rectangle bounds = editor.getClientArea();
Point size = button.computeSize(SWT.DEFAULT, SWT.DEFAULT, force);
if (contents != null) {
contents.setBounds(0, 0, bounds.width - size.x, bounds.height);
}
button.setBounds(bounds.width - size.x, 0, size.x, bounds.height);
}
public Point computeSize(Composite editor, int wHint, int hHint,
boolean force) {
if (wHint != SWT.DEFAULT && hHint != SWT.DEFAULT) {
return new Point(wHint, hHint);
}
Point contentsSize = contents.computeSize(SWT.DEFAULT, SWT.DEFAULT,
force);
Point buttonSize = button.computeSize(SWT.DEFAULT, SWT.DEFAULT,
force);
// Just return the button width to ensure the button is not clipped
// if the label is long.
// The label will just use whatever extra width there is
Point result = new Point(buttonSize.x, Math.max(contentsSize.y,
buttonSize.y));
return result;
}
}
//Combo default style
private static final int defaultStyle = SWT.NONE;
public ComboBoxDialogCellEditor() {
setStyle(defaultStyle);
}
public ComboBoxDialogCellEditor(Composite parent, String[] items) {
this(parent, items, defaultStyle);
}
public ComboBoxDialogCellEditor(Composite parent, String[] items, int style) {
super(parent, style);
setItems(items);
}
public String[] getItems() {
return items;
}
public void setItems(String[] items) {
Assert.isNotNull(items);
this.items = items;
populateComboBoxItems();
}
protected Button createButton(Composite parent) {
Button result = new Button(parent, SWT.DOWN);
result.setText(""); //$NON-NLS-1$
return result;
}
protected Control createContents(Composite cell) {
comboBox = new CCombo(cell, getStyle());
comboBox.setFont(cell.getFont());
populateComboBoxItems();
comboBox.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
keyReleaseOccured(e);
}
});
comboBox.addModifyListener(getModifyListener());
comboBox.addSelectionListener(new SelectionAdapter() {
public void widgetDefaultSelected(SelectionEvent event) {
applyEditorValueAndDeactivate();
}
public void widgetSelected(SelectionEvent event) {
value = comboBox.getText();
}
});
comboBox.addTraverseListener(new TraverseListener() {
public void keyTraversed(TraverseEvent e) {
if (e.detail == SWT.TRAVERSE_ESCAPE
|| e.detail == SWT.TRAVERSE_RETURN) {
e.doit = false;
}
}
});
comboBox.addFocusListener(new FocusAdapter() {
public void focusLost(FocusEvent e) {
if(!button.isFocusControl()) {
ComboBoxDialogCellEditor.this.focusLost();
}
}
});
return comboBox;
}
@Override
protected Control createControl(Composite parent) {
Font font = parent.getFont();
Color bg = parent.getBackground();
editor = new Composite(parent, getStyle());
editor.setFont(font);
editor.setBackground(bg);
editor.setLayout(new DialogCellLayout());
contents = createContents(editor);
updateContents(value);
button = createButton(editor);
button.setFont(font);
button.addKeyListener(new KeyAdapter() {
public void keyReleased(KeyEvent e) {
if (e.character == '\u001b') { // Escape
fireCancelEditor();
}
}
});
button.addFocusListener(getButtonFocusListener());
button.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
button.removeFocusListener(getButtonFocusListener());
Object newValue = openDialogBox(editor);
button.addFocusListener(getButtonFocusListener());
if (newValue != null) {
boolean newValidState = isCorrect(newValue);
if (newValidState) {
markDirty();
doSetValue(newValue);
} else {
setErrorMessage(MessageFormat.format(getErrorMessage(),
new Object[] { newValue.toString() }));
}
fireApplyEditorValue();
}
}
});
setValueValid(true);
return editor;
}
public void deactivate() {
if (button != null && !button.isDisposed()) {
button.removeFocusListener(getButtonFocusListener());
}
super.deactivate();
}
@Override
protected Object doGetValue() {
return value;
}
@Override
protected void doSetFocus() {
if (comboBox != null)
comboBox.setFocus();
}
@Override
protected void doSetValue(Object value) {
this.value = value;
updateContents(value);
}
private void populateComboBoxItems() {
if (comboBox != null && items != null) {
comboBox.removeAll();
for (int i = 0; i < items.length; i++) {
comboBox.add(items[i], i);
}
comboBox.setText("");
}
}
void applyEditorValueAndDeactivate() {
Object newValue = comboBox.getText();
if (newValue != null && !newValue.equals(value.toString())) {
boolean newValidState = isCorrect(newValue);
if (newValidState) {
markDirty();
doSetValue(newValue);
} else {
setErrorMessage(MessageFormat.format(getErrorMessage(),
new Object[] { newValue.toString() }));
}
}
fireApplyEditorValue();
deactivate();
}
/**//*
* (non-Javadoc)
* @see org.eclipse.jface.viewers.CellEditor#focusLost()
*/
protected void focusLost() {
if (isActivated()) {
applyEditorValueAndDeactivate();
}
}
/**//*
* (non-Javadoc)
* @see org.eclipse.jface.viewers.CellEditor#keyReleaseOccured(org.eclipse.swt.events.KeyEvent)
*/
protected void keyReleaseOccured(KeyEvent keyEvent) {
if (keyEvent.character == '\r') { // Return key
if (comboBox != null && !comboBox.isDisposed())
fireCancelEditor();
} else if (keyEvent.character == '\t') { // tab key
applyEditorValueAndDeactivate();
}
}
protected void editOccured(ModifyEvent e) {
String value = comboBox.getText();
if (value == null) {
value = "";//$NON-NLS-1$
}
Object typedValue = value;
boolean oldValidState = isValueValid();
boolean newValidState = isCorrect(typedValue);
if (typedValue == null && newValidState) {
Assert.isTrue(false,
"Validator isn't limiting the cell editor's type range");//$NON-NLS-1$
}
if (!newValidState) {
// try to insert the current value into the error message.
setErrorMessage(MessageFormat.format(getErrorMessage(),
new Object[] { value }));
}
valueChanged(oldValidState, newValidState);
}
private ModifyListener getModifyListener() {
if (modifyListener == null) {
modifyListener = new ModifyListener() {
public void modifyText(ModifyEvent e) {
editOccured(e);
}
};
}
return modifyListener;
}
private FocusListener getButtonFocusListener() {
if (buttonFocusListener == null) {
buttonFocusListener = new FocusListener() {
public void focusGained(FocusEvent e) {};
public void focusLost(FocusEvent e) {
ComboBoxDialogCellEditor.this.focusLost();
}
};
};
return buttonFocusListener;
}
private void updateContents(Object value) {
Assert.isTrue(comboBox != null);
if (value != null && value instanceof String) {
comboBox.removeModifyListener(getModifyListener());
comboBox.setText((String) value);
comboBox.addModifyListener(getModifyListener());
}
}
protected abstract Object openDialogBox(Control cellEditorWindow);
}
posted on 2008-06-02 13:46
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