/*
* (C) Copyright IBM Corp. 1998-2004. All Rights Reserved.
*
* The program is provided "as is" without any warranty express or
* implied, including the warranty of non-infringement and the implied
* warranties of merchantibility and fitness for a particular purpose.
* IBM will not be liable for any damages suffered by you as a result
* of using the Program. In no event will IBM be liable for any
* special, indirect or consequential damages or lost profits even if
* IBM has been advised of the possibility of their occurrence. IBM
* will not be liable for any third party claims against you.
*/
package com.ibm.richtext.uiimpl;
import java.util.EventObject;
import com.ibm.richtext.textpanel.MTextPanel;
import com.ibm.richtext.textpanel.TextPanelEvent;
import com.ibm.richtext.uiimpl.resources.MenuData;
public abstract class CommandMenuItem extends MenuItemSet {
static final String COPYRIGHT =
"(C) Copyright IBM Corp. 1998-1999 - All Rights Reserved";
private /*final*/ MItem fItem;
protected abstract boolean isEnabled();
protected abstract void performAction();
protected CommandMenuItem(MenuData data) {
this(data, false);
}
protected CommandMenuItem(MenuData data, boolean enableByDefault) {
fItem = MItem.createItem(data);
fItem.addListener(new EventListener() {
public void eventOccurred(EventObject event) {
performAction();
}
});
fItem.setEnabled(enableByDefault);
}
protected void textPanelChanged() {
MTextPanel textPanel = getTextPanel();
if (textPanel == null) {
fItem.setEnabled(false);
}
else {
fItem.setEnabled(isEnabled());
}
}
public final void textEventOccurred(TextPanelEvent event) {
fItem.setEnabled(isEnabled());
}
public static final class CutCopyClear extends CommandMenuItem {
public static final int CUT = 0;
public static final int COPY = 1;
public static final int CLEAR = 2;
private final int fKind;
public CutCopyClear(MenuData menuData, int kind) {
super(menuData);
if (kind != CUT && kind != COPY && kind != CLEAR) {
throw new IllegalArgumentException("Invalid menu kind");
}
fKind = kind;
}
protected boolean isEnabled() {
MTextPanel panel = getTextPanel();
return panel.getSelectionStart() != panel.getSelectionEnd();
}
public boolean respondsToEventType(int type) {
return type == TextPanelEvent.SELECTION_EMPTY_CHANGED;
}
protected void performAction() {
MTextPanel panel = getTextPanel();
switch (fKind) {
case CUT:
panel.cut();
break;
case COPY:
panel.copy();
break;
case CLEAR:
panel.clear();
break;
}
}
}
public static final class UndoRedo extends CommandMenuItem {
public static final boolean UNDO = true;
public static final boolean REDO = false;
private boolean fKind;
public UndoRedo(MenuData menuData, boolean kind) {
super(menuData);
fKind = kind;
}
protected boolean isEnabled() {
MTextPanel panel = getTextPanel();
if (fKind == UNDO) {
return panel.canUndo();
}
else {
return panel.canRedo();
}
}
public boolean respondsToEventType(int type) {
return type == TextPanelEvent.UNDO_STATE_CHANGED;
}
protected void performAction() {
MTextPanel panel = getTextPanel();
if (fKind == UNDO) {
panel.undo();
}
else {
panel.redo();
}
}
}
public static final class Paste extends CommandMenuItem {
public Paste(MenuData menuData) {
super(menuData);
}
protected boolean isEnabled() {
return getTextPanel().clipboardNotEmpty();
}
public boolean respondsToEventType(int type) {
return type == TextPanelEvent.CLIPBOARD_CHANGED;
}
protected void performAction() {
getTextPanel().paste();
}
}
public static final class SelectAll extends CommandMenuItem {
public SelectAll(MenuData menuData) {
super(menuData);
}
protected boolean isEnabled() {
return true;
}
public boolean respondsToEventType(int type) {
return false;
}
protected void performAction() {
getTextPanel().selectAll();
}
}
}