/*******************************************************************************
* Copyright (c) 2006, 2007 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui.menus;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Map;
import org.eclipse.core.commands.Command;
import org.eclipse.core.commands.CommandEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.ICommandListener;
import org.eclipse.core.commands.IParameter;
import org.eclipse.core.commands.NotEnabledException;
import org.eclipse.core.commands.NotHandledException;
import org.eclipse.core.commands.Parameterization;
import org.eclipse.core.commands.ParameterizedCommand;
import org.eclipse.core.commands.common.NotDefinedException;
import org.eclipse.jface.action.ContributionItem;
import org.eclipse.jface.action.IMenuListener;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.bindings.TriggerSequence;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.resource.LocalResourceManager;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;
import org.eclipse.swt.widgets.Widget;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPartSite;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.commands.ICommandService;
import org.eclipse.ui.commands.IElementReference;
import org.eclipse.ui.handlers.IHandlerService;
import org.eclipse.ui.internal.WorkbenchPlugin;
import org.eclipse.ui.internal.commands.ICommandImageService;
import org.eclipse.ui.keys.IBindingService;
import org.eclipse.ui.services.IServiceLocator;
/**
* A contribution item which delegates to a command. It can be used in
* {@link AbstractContributionFactory#createContributionItems(IServiceLocator, IContributionRoot)}.
* <p>
* It currently supports placement in menus and toolbars.
* </p>
* <p>
* This class may be instantiated; it is not intended to be subclassed.
* </p>
*
* @since 3.3
*/
public final class CommandContributionItem extends ContributionItem {
/**
* A push button tool item or menu item.
*/
public static final int STYLE_PUSH = SWT.PUSH;
/**
* A checked tool item or menu item.
*/
public static final int STYLE_CHECK = SWT.CHECK;
/**
* A radio-button style menu item.
*/
public static final int STYLE_RADIO = SWT.RADIO;
/**
* A ToolBar pulldown item.
*/
public static final int STYLE_PULLDOWN = SWT.DROP_DOWN;
private LocalResourceManager localResourceManager;
private Listener menuItemListener;
private Widget widget;
private IMenuService menuService;
private ICommandService commandService;
private IHandlerService handlerService;
private IBindingService bindingService;
private ParameterizedCommand command;
private ImageDescriptor icon;
private String label;
private String tooltip;
private ImageDescriptor disabledIcon;
private ImageDescriptor hoverIcon;
private String mnemonic;
private IElementReference elementRef;
private boolean checkedState;
private int style;
private ICommandListener commandListener;
private String dropDownMenuOverride;
/**
* Create a CommandContributionItem to place in a ContributionManager.
*
* @param serviceLocator
* a service locator that is most appropriate for this
* contribution. Typically the local {@link IWorkbenchWindow} or
* {@link IWorkbenchPartSite} will be sufficient.
* @param id
* The id for this item. May be <code>null</code>. Items
* without an id cannot be referenced later.
* @param commandId
* A command id for a defined command. Must not be
* <code>null</code>.
* @param parameters
* A map of strings to strings which represent parameter names to
* values. The parameter names must match those in the command
* definition.
* @param icon
* An icon for this item. May be <code>null</code>.
* @param disabledIcon
* A disabled icon for this item. May be <code>null</code>.
* @param hoverIcon
* A hover icon for this item. May be <code>null</code>.
* @param label
* A label for this item. May be <code>null</code>.
* @param mnemonic
* A mnemonic for this item to be applied to the label. May be
* <code>null</code>.
* @param tooltip
* A tooltip for this item. May be <code>null</code>. Tooltips
* are currently only valid for toolbar contributions.
* @param style
* The style of this menu contribution. See the STYLE_* contants.
*/
public CommandContributionItem(IServiceLocator serviceLocator, String id,
String commandId, Map parameters, ImageDescriptor icon,
ImageDescriptor disabledIcon, ImageDescriptor hoverIcon,
String label, String mnemonic, String tooltip, int style) {
super(id);
this.icon = icon;
this.disabledIcon = disabledIcon;
this.hoverIcon = hoverIcon;
this.label = label;
this.mnemonic = mnemonic;
this.tooltip = tooltip;
this.style = style;
menuService = (IMenuService) serviceLocator
.getService(IMenuService.class);
commandService = (ICommandService) serviceLocator
.getService(ICommandService.class);
handlerService = (IHandlerService) serviceLocator
.getService(IHandlerService.class);
bindingService = (IBindingService) serviceLocator
.getService(IBindingService.class);
createCommand(commandId, parameters);
if (command != null) {
try {
UIElement callback = new UIElement(serviceLocator) {
public void setChecked(boolean checked) {
CommandContributionItem.this.setChecked(checked);
}
public void setDisabledIcon(ImageDescriptor desc) {
CommandContributionItem.this.setDisabledIcon(desc);
}
public void setHoverIcon(ImageDescriptor desc) {
CommandContributionItem.this.setHoverIcon(desc);
}
public void setIcon(ImageDescriptor desc) {
CommandContributionItem.this.setIcon(desc);
}
public void setText(String text) {
CommandContributionItem.this.setText(text);
}
public void setTooltip(String text) {
CommandContributionItem.this.setTooltip(text);
}
public void setDropDownId(String id) {
dropDownMenuOverride = id;
}
};
elementRef = commandService.registerElementForCommand(command,
callback);
command.getCommand().addCommandListener(getCommandListener());
setImages(serviceLocator);
} catch (NotDefinedException e) {
WorkbenchPlugin.log("Unable to register menu item \"" + getId() //$NON-NLS-1$
+ "\", command \"" + commandId + "\" not defined"); //$NON-NLS-1$ //$NON-NLS-2$
}
}
}
private void setImages(IServiceLocator locator) {
if (icon == null) {
ICommandImageService service = (ICommandImageService) locator
.getService(ICommandImageService.class);
icon = service.getImageDescriptor(command.getId(),
ICommandImageService.TYPE_DEFAULT);
disabledIcon = service.getImageDescriptor(command.getId(),
ICommandImageService.TYPE_DISABLED);
hoverIcon = service.getImageDescriptor(command.getId(),
ICommandImageService.TYPE_HOVER);
}
}
/**
* @return
*/
private ICommandListener getCommandListener() {
if (commandListener == null) {
commandListener = new ICommandListener() {
public void commandChanged(CommandEvent commandEvent) {
if (commandEvent.isHandledChanged()
|| commandEvent.isEnabledChanged()
|| commandEvent.isDefinedChanged()) {
if (commandEvent.isHandledChanged()) {
dropDownMenuOverride = null;
}
if (commandEvent.getCommand().isDefined()) {
update(null);
}
}
}
};
}
return commandListener;
}
ParameterizedCommand getCommand() {
return command;
}
void createCommand(String commandId, Map parameters) {
if (commandId == null) {
WorkbenchPlugin.log("Unable to create menu item \"" + getId() //$NON-NLS-1$
+ "\", no command id"); //$NON-NLS-1$
return;
}
Command cmd = commandService.getCommand(commandId);
if (!cmd.isDefined()) {
WorkbenchPlugin.log("Unable to create menu item \"" + getId() //$NON-NLS-1$
+ "\", command \"" + commandId + "\" not defined"); //$NON-NLS-1$ //$NON-NLS-2$
return;
}
if (parameters == null || parameters.size() == 0) {
command = new ParameterizedCommand(cmd, null);
return;
}
try {
ArrayList parmList = new ArrayList();
Iterator i = parameters.entrySet().iterator();
while (i.hasNext()) {
Map.Entry entry = (Map.Entry) i.next();
String parmName = (String) entry.getKey();
IParameter parm;
parm = cmd.getParameter(parmName);
if (parm == null) {
WorkbenchPlugin
.log("Unable to create menu item \"" + getId() //$NON-NLS-1$
+ "\", parameter \"" + parmName + "\" for command \"" //$NON-NLS-1$ //$NON-NLS-2$
+ commandId + "\" is not defined"); //$NON-NLS-1$
return;
}
parmList.add(new Parameterization(parm, (String) entry
.getValue()));
}
command = new ParameterizedCommand(cmd,
(Parameterization[]) parmList
.toArray(new Parameterization[parmList.size()]));
} catch (NotDefinedException e) {
// this shouldn't happen as we checked for !defined, but we
// won't take the chance
WorkbenchPlugin.log("Failed to create menu item " //$NON-NLS-1$
+ getId(), e);
}
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.action.ContributionItem#fill(org.eclipse.swt.widgets.Menu,
* int)
*/
public void fill(Menu parent, int index) {
if (command == null) {
return;
}
if (widget != null || parent == null) {
return;
}
// Menus don't support the pulldown style
int tmpStyle = style;
if (tmpStyle == STYLE_PULLDOWN)
tmpStyle = STYLE_PUSH;
MenuItem item = null;
if (index >= 0) {
item = new MenuItem(parent, tmpStyle, index);
} else {
item = new MenuItem(parent, tmpStyle);
}
item.setData(this);
item.addListener(SWT.Dispose, getItemListener());
item.addListener(SWT.Selection, getItemListener());
widget = item;
String helpContextId = null;
try {
helpContextId = commandService.getHelpContextId(command
.getCommand().getId());
} catch (NotDefinedException e) {
// No helpContextId
}
IWorkbench workbench = PlatformUI.getWorkbench();
if (workbench != null && helpContextId != null) {
workbench.getHelpSystem().setHelp(item, helpContextId);
}
update(null);
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.action.ContributionItem#fill(org.eclipse.swt.widgets.ToolBar,
* int)
*/
public void fill(ToolBar parent, int index) {
if (command == null) {
return;
}
if (widget != null || parent == null) {
return;
}
ToolItem item = null;
if (index >= 0) {
item = new ToolItem(parent, style, index);
} else {
item = new ToolItem(parent, style);
}
item.setData(this);
item.addListener(SWT.Selection, getItemListener());
item.addListener(SWT.Dispose, getItemListener());
widget = item;
update(null);
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.action.ContributionItem#update()
*/
public void update() {
update(null);
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.action.ContributionItem#update(java.lang.String)
*/
public void update(String id) {
if (widget != null) {
if (widget instanceof MenuItem) {
MenuItem item = (MenuItem) widget;
String text = label;
if (text == null) {
if (command != null) {
try {
text = command.getCommand().getName();
} catch (NotDefinedException e) {
WorkbenchPlugin.log("Update item failed " //$NON-NLS-1$
+ getId(), e);
}
}
}
text = updateMnemonic(text);
String keyBindingText = null;
if (command != null) {
TriggerSequence[] bindings = bindingService
.getActiveBindingsFor(command);
if (bindings.length > 0) {
keyBindingText = bindings[0].format();
}
}
if (text != null) {
if (keyBindingText == null) {
item.setText(text);
} else {
item.setText(text + '\t' + keyBindingText);
}
}
updateIcons();
if (item.getSelection() != checkedState) {
item.setSelection(checkedState);
}
boolean shouldBeEnabled = isEnabled();
if (item.getEnabled() != shouldBeEnabled) {
item.setEnabled(shouldBeEnabled);
}
} else if (widget instanceof ToolItem) {
ToolItem item = (ToolItem) widget;
if (icon != null) {
updateIcons();
} else if (label != null) {
item.setText(label);
}
if (tooltip != null)
item.setToolTipText(tooltip);
else {
String text = label;
if (text == null) {
if (command != null) {
try {
text = command.getCommand().getName();
} catch (NotDefinedException e) {
WorkbenchPlugin.log("Update item failed " //$NON-NLS-1$
+ getId(), e);
}
}
}
if (text != null) {
item.setToolTipText(text);
}
}
if (item.getSelection() != checkedState) {
item.setSelection(checkedState);
}
boolean shouldBeEnabled = isEnabled();
if (item.getEnabled() != shouldBeEnabled) {
item.setEnabled(shouldBeEnabled);
}
}
}
}
private String updateMnemonic(String s) {
if (mnemonic==null || s==null) {
return s;
}
int idx = s.indexOf(mnemonic);
if (idx==-1) {
return s;
}
return s.substring(0, idx) + '&' + s.substring(idx);
}
private void handleWidgetDispose(Event event) {
if (event.widget == widget) {
widget.removeListener(SWT.Selection, getItemListener());
widget.removeListener(SWT.Dispose, getItemListener());
widget = null;
disposeOldImages();
}
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.action.ContributionItem#dispose()
*/
public void dispose() {
if (elementRef != null) {
commandService.unregisterElement(elementRef);
elementRef = null;
}
if (commandListener != null) {
command.getCommand().removeCommandListener(commandListener);
commandListener = null;
}
command = null;
commandService = null;
disposeOldImages();
super.dispose();
}
private void disposeOldImages() {
if (localResourceManager != null) {
localResourceManager.dispose();
localResourceManager = null;
}
}
private Listener getItemListener() {
if (menuItemListener == null) {
menuItemListener = new Listener() {
public void handleEvent(Event event) {
switch (event.type) {
case SWT.Dispose:
handleWidgetDispose(event);
break;
case SWT.Selection:
if (event.widget != null) {
handleWidgetSelection(event);
}
break;
}
}
};
}
return menuItemListener;
}
private void handleWidgetSelection(Event event) {
// Special check for ToolBar dropdowns...
if (openDropDownMenu(event))
return;
if ((style & (SWT.TOGGLE | SWT.CHECK)) != 0) {
if (event.widget instanceof ToolItem) {
checkedState = ((ToolItem)event.widget).getSelection();
} else if (event.widget instanceof MenuItem) {
checkedState = ((MenuItem)event.widget).getSelection();
}
}
try {
handlerService.executeCommand(command, event);
} catch (ExecutionException e) {
WorkbenchPlugin.log("Failed to execute item " //$NON-NLS-1$
+ getId(), e);
} catch (NotDefinedException e) {
WorkbenchPlugin.log("Failed to execute item " //$NON-NLS-1$
+ getId(), e);
} catch (NotEnabledException e) {
WorkbenchPlugin.log("Failed to execute item " //$NON-NLS-1$
+ getId(), e);
} catch (NotHandledException e) {
WorkbenchPlugin.log("Failed to execute item " //$NON-NLS-1$
+ getId(), e);
}
}
/**
* Determines if the selection was on the dropdown affordance and, if so,
* opens the drop down menu (populated using the same id as this item...
*
* @param event
* The <code>SWT.Selection</code> event to be tested
*
* @return <code>true</code> iff a drop down menu was opened
*/
private boolean openDropDownMenu(Event event) {
Widget item = event.widget;
if (item != null) {
int style = item.getStyle();
if ((style & SWT.DROP_DOWN) != 0) {
if (event.detail == 4) { // on drop-down button
ToolItem ti = (ToolItem) item;
final MenuManager menuManager = new MenuManager();
Menu menu = menuManager.createContextMenu(ti.getParent());
String helpContextId = null;
try {
helpContextId = commandService.getHelpContextId(command
.getCommand().getId());
} catch (NotDefinedException e) {
// No helpContextId
}
IWorkbench workbench = PlatformUI.getWorkbench();
if (workbench != null && helpContextId != null) {
workbench.getHelpSystem().setHelp(menu, helpContextId);
}
menuManager.addMenuListener(new IMenuListener() {
public void menuAboutToShow(IMenuManager manager) {
String id = getId();
if (dropDownMenuOverride != null) {
id = dropDownMenuOverride;
}
menuService.populateContributionManager(
menuManager, "menu:" + id); //$NON-NLS-1$
}
});
// position the menu below the drop down item
Rectangle b = ti.getBounds();
Point p = ti.getParent().toDisplay(
new Point(b.x, b.y + b.height));
menu.setLocation(p.x, p.y); // waiting for SWT
// 0.42
menu.setVisible(true);
return true; // we don't fire the action
}
}
}
return false;
}
private void setIcon(ImageDescriptor desc) {
icon = desc;
updateIcons();
}
private void updateIcons() {
if (widget instanceof MenuItem) {
MenuItem item = (MenuItem) widget;
LocalResourceManager m = new LocalResourceManager(JFaceResources
.getResources());
item.setImage(icon == null ? null : m.createImage(icon));
disposeOldImages();
localResourceManager = m;
} else if (widget instanceof ToolItem) {
ToolItem item = (ToolItem) widget;
LocalResourceManager m = new LocalResourceManager(JFaceResources
.getResources());
item.setDisabledImage(disabledIcon == null ? null : m
.createImage(disabledIcon));
item.setHotImage(hoverIcon == null ? null : m
.createImage(hoverIcon));
item.setImage(icon == null ? null : m.createImage(icon));
disposeOldImages();
localResourceManager = m;
}
}
private void setText(String text) {
label = text;
update(null);
}
private void setChecked(boolean checked) {
if (checkedState == checked) {
return;
}
checkedState = checked;
if (widget instanceof MenuItem) {
((MenuItem) widget).setSelection(checkedState);
} else if (widget instanceof ToolItem) {
((ToolItem) widget).setSelection(checkedState);
}
}
private void setTooltip(String text) {
tooltip = text;
if (widget instanceof ToolItem) {
((ToolItem) widget).setToolTipText(text);
}
}
private void setDisabledIcon(ImageDescriptor desc) {
disabledIcon = desc;
updateIcons();
}
private void setHoverIcon(ImageDescriptor desc) {
hoverIcon = desc;
updateIcons();
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.action.ContributionItem#isEnabled()
*/
public boolean isEnabled() {
if (command != null) {
return command.getCommand().isEnabled();
}
return false;
}
}