| /******************************************************************************* |
| * Copyright (c) 2002, 2011 Innoopract Informationssysteme GmbH 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: |
| * Innoopract Informationssysteme GmbH - initial API and implementation |
| * EclipseSource - ongoing development |
| ******************************************************************************/ |
| package org.eclipse.swt.widgets; |
| |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.SWTException; |
| import org.eclipse.swt.events.ArmListener; |
| import org.eclipse.swt.events.DisposeEvent; |
| import org.eclipse.swt.events.DisposeListener; |
| import org.eclipse.swt.events.HelpEvent; |
| import org.eclipse.swt.events.HelpListener; |
| import org.eclipse.swt.events.SelectionEvent; |
| import org.eclipse.swt.events.SelectionListener; |
| import org.eclipse.swt.graphics.Image; |
| import org.eclipse.swt.internal.widgets.ItemHolder; |
| |
| |
| /** |
| * Instances of this class represent a selectable user interface object |
| * that issues notification when pressed and released. |
| * <dl> |
| * <dt><b>Styles:</b></dt> |
| * <dd>CHECK, CASCADE, PUSH, RADIO, SEPARATOR</dd> |
| * <dt><b>Events:</b></dt> |
| * <dd>Arm, Help, Selection</dd> |
| * </dl> |
| * <p> |
| * Note: Only one of the styles CHECK, CASCADE, PUSH, RADIO and SEPARATOR |
| * may be specified. |
| * </p><p> |
| * IMPORTANT: This class is <em>not</em> intended to be subclassed. |
| * </p> |
| */ |
| public class MenuItem extends Item { |
| |
| private final Menu parent; |
| private Menu menu; |
| private DisposeListener menuDisposeListener; |
| private boolean selection; |
| private int userId; |
| |
| /** |
| * Constructs a new instance of this class given its parent |
| * (which must be a <code>Menu</code>) and a style value |
| * describing its behavior and appearance. The item is added |
| * to the end of the items maintained by its parent. |
| * <p> |
| * The style value is either one of the style constants defined in |
| * class <code>SWT</code> which is applicable to instances of this |
| * class, or must be built by <em>bitwise OR</em>'ing together |
| * (that is, using the <code>int</code> "|" operator) two or more |
| * of those <code>SWT</code> style constants. The class description |
| * lists the style constants that are applicable to the class. |
| * Style bits are also inherited from superclasses. |
| * </p> |
| * |
| * @param parent a menu control which will be the parent of the new instance (cannot be null) |
| * @param style the style of control to construct |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> |
| * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li> |
| * </ul> |
| * |
| * @see SWT#CHECK |
| * @see SWT#CASCADE |
| * @see SWT#PUSH |
| * @see SWT#RADIO |
| * @see SWT#SEPARATOR |
| * @see Widget#checkSubclass |
| * @see Widget#getStyle |
| */ |
| public MenuItem( Menu parent, int style ) { |
| super( parent, checkStyle( style ) ); |
| this.parent = parent; |
| ItemHolder.getItemHolder( parent ).add( this ); |
| } |
| |
| /** |
| * Constructs a new instance of this class given its parent |
| * (which must be a <code>Menu</code>), a style value |
| * describing its behavior and appearance, and the index |
| * at which to place it in the items maintained by its parent. |
| * <p> |
| * The style value is either one of the style constants defined in |
| * class <code>SWT</code> which is applicable to instances of this |
| * class, or must be built by <em>bitwise OR</em>'ing together |
| * (that is, using the <code>int</code> "|" operator) two or more |
| * of those <code>SWT</code> style constants. The class description |
| * lists the style constants that are applicable to the class. |
| * Style bits are also inherited from superclasses. |
| * </p> |
| * |
| * @param parent a menu control which will be the parent of the new instance (cannot be null) |
| * @param style the style of control to construct |
| * @param index the zero-relative index to store the receiver in its parent |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> |
| * <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> |
| * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li> |
| * </ul> |
| * |
| * @see SWT#CHECK |
| * @see SWT#CASCADE |
| * @see SWT#PUSH |
| * @see SWT#RADIO |
| * @see SWT#SEPARATOR |
| * @see Widget#checkSubclass |
| * @see Widget#getStyle |
| */ |
| public MenuItem( Menu parent, int style, int index ) { |
| super( parent, checkStyle( style ) ); |
| this.parent = parent; |
| ItemHolder.getItemHolder( parent ).insert( this, index ); |
| } |
| |
| /** |
| * Returns the receiver's parent, which must be a <code>Menu</code>. |
| * |
| * @return the receiver's parent |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public Menu getParent() { |
| checkWidget(); |
| return parent; |
| } |
| |
| /** |
| * Sets the receiver's pull down menu to the argument. |
| * Only <code>CASCADE</code> menu items can have a |
| * pull down menu. The sequence of key strokes, button presses |
| * and/or button releases that are used to request a pull down |
| * menu is platform specific. |
| * <p> |
| * Note: Disposing of a menu item that has a pull down menu |
| * will dispose of the menu. To avoid this behavior, set the |
| * menu to null before the menu item is disposed. |
| * </p> |
| * |
| * @param menu the new pull down menu |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_MENU_NOT_DROP_DOWN - if the menu is not a drop down menu</li> |
| * <li>ERROR_MENUITEM_NOT_CASCADE - if the menu item is not a <code>CASCADE</code></li> |
| * <li>ERROR_INVALID_ARGUMENT - if the menu has been disposed</li> |
| * <li>ERROR_INVALID_PARENT - if the menu is not in the same widget tree</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public void setMenu( Menu menu ) { |
| checkWidget(); |
| if( this.menu != menu ) { |
| if( ( style & SWT.CASCADE ) == 0 ) { |
| SWT.error( SWT.ERROR_MENUITEM_NOT_CASCADE ); |
| } |
| if( menu != null ) { |
| if( menu.isDisposed() ) { |
| SWT.error( SWT.ERROR_INVALID_ARGUMENT ); |
| } |
| if( ( menu.getStyle() & SWT.DROP_DOWN ) == 0 ) { |
| SWT.error( SWT.ERROR_MENU_NOT_DROP_DOWN ); |
| } |
| if( menu.getParent() != getParent().getParent() ) { |
| SWT.error( SWT.ERROR_INVALID_PARENT ); |
| } |
| } |
| removeMenuDisposeListener(); |
| /* Assign the new menu */ |
| if( this.menu != null ) { |
| this.menu.cascade = null; |
| } |
| this.menu = menu; |
| if( menu != null ) { |
| menu.cascade = this; |
| } |
| addMenuDisposeListener(); |
| } |
| } |
| |
| /** |
| * Returns the receiver's cascade menu if it has one or null |
| * if it does not. Only <code>CASCADE</code> menu items can have |
| * a pull down menu. The sequence of key strokes, button presses |
| * and/or button releases that are used to request a pull down |
| * menu is platform specific. |
| * |
| * @return the receiver's menu |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public Menu getMenu() { |
| checkWidget(); |
| return menu; |
| } |
| |
| /** |
| * Sets the identifier associated with the receiver to the argument. |
| * |
| * @param id the new identifier. This must be a non-negative value. System-defined identifiers are negative values. |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * <li>ERROR_INVALID_ARGUMENT - if called with an negative-valued argument.</li> |
| * </ul> |
| * |
| * @since 1.4 |
| */ |
| public void setID( int id ) { |
| checkWidget(); |
| if( id < 0 ) { |
| error( SWT.ERROR_INVALID_ARGUMENT ); |
| } |
| userId = id; |
| } |
| |
| /** |
| * Gets the identifier associated with the receiver. |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @since 1.4 |
| */ |
| public int getID() { |
| checkWidget(); |
| return userId; |
| } |
| |
| /** |
| * Sets the image the receiver will display to the argument. |
| * <p> |
| * Note: This operation is a hint and is not supported on |
| * platforms that do not have this concept (for example, Windows NT). |
| * </p> |
| * |
| * @param image the image to display |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public void setImage( Image image ) { |
| checkWidget(); |
| if( ( style & SWT.SEPARATOR ) == 0 ) { |
| super.setImage( image ); |
| } |
| } |
| |
| ////////// |
| // Enabled |
| |
| /** |
| * Enables the receiver if the argument is <code>true</code>, |
| * and disables it otherwise. A disabled menu item is typically |
| * not selectable from the user interface and draws with an |
| * inactive or "grayed" look. |
| * |
| * @param enabled the new enabled state |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public void setEnabled( boolean enabled ) { |
| checkWidget(); |
| state &= ~DISABLED; |
| if( !enabled ) { |
| state |= DISABLED; |
| } |
| } |
| |
| /** |
| * Returns <code>true</code> if the receiver is enabled, and |
| * <code>false</code> otherwise. A disabled menu item is typically |
| * not selectable from the user interface and draws with an |
| * inactive or "grayed" look. |
| * |
| * @return the receiver's enabled state |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @see #isEnabled |
| */ |
| public boolean getEnabled() { |
| checkWidget(); |
| return ( state & DISABLED ) == 0; |
| } |
| |
| /** |
| * Returns <code>true</code> if the receiver is enabled and all |
| * of the receiver's ancestors are enabled, and <code>false</code> |
| * otherwise. A disabled menu item is typically not selectable from the |
| * user interface and draws with an inactive or "grayed" look. |
| * |
| * @return the receiver's enabled state |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @see #getEnabled |
| */ |
| public boolean isEnabled() { |
| return getEnabled() && parent.isEnabled(); |
| } |
| |
| //////////// |
| // Selection |
| |
| /** |
| * Returns <code>true</code> if the receiver is selected, |
| * and false otherwise. |
| * <p> |
| * When the receiver is of type <code>CHECK</code> or <code>RADIO</code>, |
| * it is selected when it is checked. |
| * |
| * @return the selection state |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public boolean getSelection() { |
| checkWidget(); |
| return selection; |
| } |
| |
| /** |
| * Sets the selection state of the receiver. |
| * <p> |
| * When the receiver is of type <code>CHECK</code> or <code>RADIO</code>, |
| * it is selected when it is checked. |
| * |
| * @param selection the new selection state |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public void setSelection( boolean selection ) { |
| checkWidget(); |
| if( ( style & ( SWT.CHECK | SWT.RADIO ) ) != 0 ) { |
| this.selection = selection; |
| } |
| } |
| |
| /////////////////////// |
| // Listener maintenance |
| |
| /** |
| * Adds the listener to the collection of listeners who will |
| * be notified when the menu item is selected, by sending |
| * it one of the messages defined in the <code>SelectionListener</code> |
| * interface. |
| * <p> |
| * When <code>widgetSelected</code> is called, the stateMask field of the event object is valid. |
| * <code>widgetDefaultSelected</code> is not called. |
| * </p> |
| * |
| * @param listener the listener which should be notified |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @see SelectionListener |
| * @see #removeSelectionListener |
| * @see SelectionEvent |
| */ |
| public void addSelectionListener( SelectionListener listener ) { |
| checkWidget(); |
| SelectionEvent.addListener( this, listener ); |
| } |
| |
| /** |
| * Removes the listener from the collection of listeners who will |
| * be notified when the control is selected. |
| * |
| * @param listener the listener which should no longer be notified |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @see SelectionListener |
| * @see #addSelectionListener |
| */ |
| public void removeSelectionListener( SelectionListener listener ) { |
| checkWidget(); |
| SelectionEvent.removeListener( this, listener ); |
| } |
| |
| /** |
| * Adds the listener to the collection of listeners who will |
| * be notified when the help events are generated for the control, by sending |
| * it one of the messages defined in the <code>HelpListener</code> |
| * interface. |
| * |
| * @param listener the listener which should be notified |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @see HelpListener |
| * @see #removeHelpListener |
| * @since 1.3 |
| */ |
| public void addHelpListener( HelpListener listener ) { |
| checkWidget(); |
| HelpEvent.addListener( this, listener ); |
| } |
| |
| /** |
| * Removes the listener from the collection of listeners who will |
| * be notified when the help events are generated for the control. |
| * |
| * @param listener the listener which should no longer be notified |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @see HelpListener |
| * @see #addHelpListener |
| * @since 1.3 |
| */ |
| public void removeHelpListener( HelpListener listener ) { |
| checkWidget(); |
| HelpEvent.removeListener( this, listener ); |
| } |
| |
| /** |
| * Adds the listener to the collection of listeners who will |
| * be notified when the arm events are generated for the control, by sending |
| * it one of the messages defined in the <code>ArmListener</code> |
| * interface. |
| * |
| * @param listener the listener which should be notified |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @see ArmListener |
| * @see #removeArmListener |
| * @since 1.3 |
| */ |
| public void addArmListener( ArmListener listener ) { |
| checkWidget(); |
| if( listener == null ) { |
| error( SWT.ERROR_NULL_ARGUMENT ); |
| } |
| TypedListener typedListener = new TypedListener( listener ); |
| addListener( SWT.Arm, typedListener ); |
| } |
| |
| /** |
| * Removes the listener from the collection of listeners who will |
| * be notified when the arm events are generated for the control. |
| * |
| * @param listener the listener which should no longer be notified |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @see ArmListener |
| * @see #addArmListener |
| * @since 1.3 |
| */ |
| public void removeArmListener( ArmListener listener ) { |
| checkWidget(); |
| removeListener( SWT.Arm, listener ); |
| } |
| |
| ////////////////// |
| // Item overrides |
| |
| final void releaseChildren() { |
| if( menu != null ) { |
| removeMenuDisposeListener(); |
| menu.dispose(); |
| menu = null; |
| } |
| } |
| |
| final void releaseParent() { |
| super.releaseParent(); |
| ItemHolder.getItemHolder( parent ).remove( this ); |
| } |
| |
| String getNameText() { |
| String result; |
| if( ( style & SWT.SEPARATOR ) != 0 ) { |
| result = "|"; |
| } else { |
| result = super.getNameText(); |
| } |
| return result; |
| } |
| |
| /////////////////////////////////////////////////////// |
| // Helping methods to observe the disposal of the menu |
| |
| private void addMenuDisposeListener() { |
| if( menu != null ) { |
| if( menuDisposeListener == null ) { |
| menuDisposeListener = new DisposeListener() { |
| |
| public void widgetDisposed( DisposeEvent event ) { |
| MenuItem.this.menu = null; |
| } |
| }; |
| } |
| menu.addDisposeListener( menuDisposeListener ); |
| } |
| } |
| |
| private void removeMenuDisposeListener() { |
| if( menu != null ) { |
| menu.removeDisposeListener( menuDisposeListener ); |
| } |
| } |
| |
| /////////////////////////////////////// |
| // Helping methods to verify arguments |
| |
| private static int checkStyle( int style ) { |
| return checkBits( style, |
| SWT.PUSH, |
| SWT.CHECK, |
| SWT.RADIO, |
| SWT.SEPARATOR, |
| SWT.CASCADE, |
| 0 ); |
| } |
| |
| /////////////////// |
| // Skinning support |
| |
| void reskinChildren( int flags ) { |
| if( menu != null ) { |
| menu.reskin( flags ); |
| } |
| super.reskinChildren( flags ); |
| } |
| } |