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org.eclipse.swt.widgets.Menu Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2002, 2015 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.rap.rwt.internal.lifecycle.WidgetLCA;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.events.HelpListener;
import org.eclipse.swt.events.MenuListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.internal.widgets.IItemHolderAdapter;
import org.eclipse.swt.internal.widgets.IMenuAdapter;
import org.eclipse.swt.internal.widgets.ItemHolder;
import org.eclipse.swt.internal.widgets.MenuHolder;
import org.eclipse.swt.internal.widgets.menukit.MenuLCA;
/**
* Instances of this class are user interface objects that contain
* menu items.
*
* Styles: BAR, DROP_DOWN, POP_UP, NO_RADIO_GROUP
* LEFT_TO_RIGHT, RIGHT_TO_LEFT
* Events: Help, Hide, Show
*
*
* Note: Only one of BAR, DROP_DOWN and POP_UP may be specified.
* Only one of LEFT_TO_RIGHT or RIGHT_TO_LEFT may be specified.
*
* IMPORTANT: This class is not intended to be subclassed.
*
*/
public class Menu extends Widget {
private transient IMenuAdapter menuAdapter;
private final ItemHolder itemHolder;
private final Decorations parent;
private int x;
private int y;
private boolean visible = false;
private boolean hasLocation = false;
MenuItem cascade;
/**
* Constructs a new instance of this class given its parent
* (which must be a Menu) and sets the style
* for the instance so that the instance will be a drop-down
* menu on the given parent's parent.
*
* @param menu a menu which will be the parent of the new instance (cannot be null)
*
* @exception IllegalArgumentException
* ERROR_NULL_ARGUMENT - if the parent is null
*
* @exception SWTException
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
* ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
*
*
* @see SWT#DROP_DOWN
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public Menu( Menu menu ) {
this( checkNull( menu ).parent, SWT.DROP_DOWN );
}
/**
* Constructs a new instance of this class given its parent
* (which must be a MenuItem) and sets the style
* for the instance so that the instance will be a drop-down
* menu on the given parent's parent menu.
*
* @param parent a menu item which will be the parent of the new instance (cannot be null)
*
* @exception IllegalArgumentException
* ERROR_NULL_ARGUMENT - if the parent is null
*
* @exception SWTException
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
* ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
*
*
* @see SWT#DROP_DOWN
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public Menu( MenuItem parent ) {
this( checkNull( parent ).getParent().getParent(), SWT.DROP_DOWN );
}
/**
* Constructs a new instance of this class given its parent,
* and sets the style for the instance so that the instance
* will be a popup menu on the given parent's shell.
*
* @param parent a control which will be the parent of the new instance (cannot be null)
*
* @exception IllegalArgumentException
* ERROR_NULL_ARGUMENT - if the parent is null
*
* @exception SWTException
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
* ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
*
*
* @see SWT#POP_UP
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public Menu( Control parent ) {
this( checkNull( parent ).getShell(), SWT.POP_UP );
}
/**
* Constructs a new instance of this class given its parent
* (which must be a Decorations) and a style value
* describing its behavior and appearance.
*
* The style value is either one of the style constants defined in
* class SWT which is applicable to instances of this
* class, or must be built by bitwise OR 'ing together
* (that is, using the int "|" operator) two or more
* of those SWT style constants. The class description
* lists the style constants that are applicable to the class.
* Style bits are also inherited from superclasses.
*
*
* @param parent a decorations control which will be the parent of the new instance (cannot be null)
* @param style the style of menu to construct
*
* @exception IllegalArgumentException
* ERROR_NULL_ARGUMENT - if the parent is null
*
* @exception SWTException
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
* ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
*
*
* @see SWT#BAR
* @see SWT#DROP_DOWN
* @see SWT#POP_UP
* @see SWT#NO_RADIO_GROUP
* @see SWT#LEFT_TO_RIGHT
* @see SWT#RIGHT_TO_LEFT
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public Menu( Decorations parent, int style ) {
super( parent, checkStyle( style ) );
this.parent = parent;
itemHolder = new ItemHolder<>( MenuItem.class );
parent.getAdapter( MenuHolder.class ).addMenu( this );
checkOrientation( parent );
}
/**
* Returns the receiver's parent, which must be a Decorations.
*
* @return the receiver's parent
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public Decorations getParent() {
checkWidget();
return parent;
}
/**
* Returns the receiver's parent item, which must be a
* MenuItem or null when the receiver is a
* root.
*
* @return the receiver's parent item
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public MenuItem getParentItem() {
checkWidget ();
return cascade;
}
/**
* Returns the receiver's parent item, which must be a
* Menu or null when the receiver is a
* root.
*
* @return the receiver's parent item
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public Menu getParentMenu() {
checkWidget();
if( cascade != null ) {
return cascade.getParent();
}
return null;
}
@Override
@SuppressWarnings("unchecked")
public T getAdapter( Class adapter ) {
if( adapter == IItemHolderAdapter.class ) {
return ( T )itemHolder;
}
if( adapter == IMenuAdapter.class ) {
if( menuAdapter == null ) {
menuAdapter = new IMenuAdapter() {
@Override
public Point getLocation() {
return new Point( x, y );
}
};
}
return ( T )menuAdapter;
}
if( adapter == WidgetLCA.class ) {
return ( T )MenuLCA.INSTANCE;
}
return super.getAdapter( adapter );
}
/**
* Sets the location of the receiver, which must be a popup,
* to the point specified by the arguments which are relative
* to the display.
*
* Note that this is different from most widgets where the
* location of the widget is relative to the parent.
*
* Note that the platform window manager ultimately has control
* over the location of popup menus.
*
*
* @param x the new x coordinate for the receiver
* @param y the new y coordinate for the receiver
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public void setLocation( int x, int y ) {
checkWidget();
if( ( style & ( SWT.BAR | SWT.DROP_DOWN ) ) == 0 ) {
this.x = x;
this.y = y;
hasLocation = true;
}
}
/**
* Sets the location of the receiver, which must be a popup,
* to the point specified by the argument which is relative
* to the display.
*
* Note that this is different from most widgets where the
* location of the widget is relative to the parent.
*
* Note that the platform window manager ultimately has control
* over the location of popup menus.
*
*
* @param location the new location for the receiver
*
* @exception IllegalArgumentException
* ERROR_NULL_ARGUMENT - if the point is null
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @since 1.0
*/
public void setLocation( Point location ) {
checkWidget();
if( location == null ) {
SWT.error( SWT.ERROR_NULL_ARGUMENT );
}
setLocation( location.x, location.y );
}
/**
* Returns the receiver's shell. For all controls other than
* shells, this simply returns the control's nearest ancestor
* shell. Shells return themselves, even if they are children
* of other shells.
*
* @return the receiver's shell
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @see #getParent
*/
public Shell getShell() {
checkWidget();
return parent.getShell();
}
/**
* Sets the orientation of the receiver, which must be one
* of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.
*
* @param orientation new orientation style
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @since 1.4
*/
public void setOrientation( int orientation ) {
checkWidget();
if( ( style & ( SWT.BAR | SWT.DROP_DOWN ) ) == 0 ) {
int flags = SWT.RIGHT_TO_LEFT | SWT.LEFT_TO_RIGHT;
if( ( orientation & flags ) == 0 || ( orientation & flags ) == flags ) {
return;
}
style &= ~flags;
style |= orientation & flags;
}
}
/**
* Returns the orientation of the receiver, which will be one of the
* constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.
*
* @return the orientation style
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @since 1.4
*/
public int getOrientation() {
checkWidget();
return style & ( SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT );
}
///////////
// Visible
/**
* Marks the receiver as visible if the argument is true,
* and marks it invisible otherwise.
*
* If one of the receiver's ancestors is not visible or some
* other condition makes the receiver not visible, marking
* it visible may not actually cause it to be displayed.
*
*
* @param visible the new visibility state
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public void setVisible( boolean visible ) {
checkWidget();
if( ( style & ( SWT.BAR | SWT.DROP_DOWN ) ) == 0 ) {
if( this.visible != visible ) {
this.visible = visible;
if( visible ) {
if ( !hasLocation ) {
setLocation( getDisplay().getCursorLocation() );
}
hasLocation = false;
notifyListeners( SWT.Show, new Event() );
}
}
}
}
/**
* Returns true if the receiver is visible, and
* false otherwise.
*
* If one of the receiver's ancestors is not visible or some
* other condition makes the receiver not visible, this method
* may still indicate that it is considered visible even though
* it may not actually be showing.
*
*
* @return the receiver's visibility state
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public boolean getVisible() {
checkWidget();
boolean result;
if( ( style & SWT.BAR ) != 0 ) {
result = ( this == parent.getMenuBar() );
} else if( ( style & SWT.POP_UP ) != 0 ) {
result = visible;
} else {
// we don't know which menus are currently visible on the client
result = false;
}
return result;
}
/**
* Returns true if the receiver is visible and all
* of the receiver's ancestors are visible and false
* otherwise.
*
* @return the receiver's visibility state
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @see #getVisible
*/
public boolean isVisible (){
checkWidget();
return getVisible();
}
///////////
// Enabled
/**
* Enables the receiver if the argument is true,
* and disables it otherwise. A disabled menu is typically
* not selectable from the user interface and draws with an
* inactive or "grayed" look.
*
* @param enabled the new enabled state
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public void setEnabled( boolean enabled ) {
checkWidget();
removeState( DISABLED );
if( !enabled ) {
addState( DISABLED );
}
}
/**
* Returns true if the receiver is enabled, and
* false otherwise. A disabled menu is typically
* not selectable from the user interface and draws with an
* inactive or "grayed" look.
*
* @return the receiver's enabled state
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @see #isEnabled
*/
public boolean getEnabled() {
checkWidget();
return !hasState( DISABLED );
}
/**
* Returns true if the receiver is enabled and all
* of the receiver's ancestors are enabled, and false
* otherwise. A disabled menu is typically not selectable from the
* user interface and draws with an inactive or "grayed" look.
*
* @return the receiver's enabled state
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @see #getEnabled
*/
public boolean isEnabled() {
checkWidget();
Menu parentMenu = getParentMenu();
if( parentMenu == null ) {
return getEnabled();
}
return getEnabled() && parentMenu.isEnabled();
}
////////////////////////////
// Management of menu items
/**
* Returns the number of items contained in the receiver.
*
* @return the number of items
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public int getItemCount() {
checkWidget();
return itemHolder.size();
}
/**
* Returns a (possibly empty) array of MenuItems which
* are the items in the receiver.
*
* Note: This is not the actual structure used by the receiver
* to maintain its list of items, so modifying the array will
* not affect the receiver.
*
*
* @return the items in the receiver
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public MenuItem[] getItems() {
checkWidget();
return itemHolder.getItems();
}
/**
* Returns the item at the given, zero-relative index in the
* receiver. Throws an exception if the index is out of range.
*
* @param index the index of the item to return
* @return the item at the given index
*
* @exception IllegalArgumentException
* ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public MenuItem getItem( int index ) {
checkWidget();
return itemHolder.getItem( index );
}
/**
* Searches the receiver's list starting at the first item
* (index 0) until an item is found that is equal to the
* argument, and returns the index of that item. If no item
* is found, returns -1.
*
* @param menuItem the search item
* @return the index of the item
*
* @exception IllegalArgumentException
* ERROR_NULL_ARGUMENT - if the string is null
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public int indexOf( MenuItem menuItem ) {
checkWidget();
if( menuItem == null ) {
SWT.error( SWT.ERROR_NULL_ARGUMENT );
}
if( menuItem.isDisposed() ) {
SWT.error( SWT.ERROR_INVALID_ARGUMENT );
}
return itemHolder.indexOf( menuItem );
}
/**
* Sets the default menu item to the argument or removes
* the default emphasis when the argument is null.
*
* @param item the default menu item or null
*
* @exception IllegalArgumentException
* ERROR_INVALID_ARGUMENT - if the menu item has been disposed
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @since 1.4
*/
public void setDefaultItem( MenuItem item ) {
checkWidget();
}
/**
* Returns the default menu item or null if none has
* been previously set.
*
* @return the default menu item.
*
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @since 1.4
*/
public MenuItem getDefaultItem() {
checkWidget();
return null;
}
////////////////////
// Widget overrides
// TODO [rh] disposal of Menu and its items not yet completely implemented
@Override
final void releaseChildren() {
MenuItem[] menuItems = itemHolder.getItems();
for( int i = 0; i < menuItems.length; i++ ) {
menuItems[ i ].dispose();
}
super.releaseChildren();
}
@Override
final void releaseWidget() {
parent.getAdapter( MenuHolder.class ).removeMenu( this );
super.releaseWidget();
}
@Override
String getNameText() {
String result = "";
MenuItem[] items = getItems();
int length = items.length;
if( length > 0 ) {
for( int i = 0; i < length - 1; i++ ) {
result = result + items[ i ].getNameText() + ", ";
}
result = result + items[ length - 1 ].getNameText();
}
return result;
}
///////////////////////////////////////
// Listener registration/deregistration
/**
* Adds the listener to the collection of listeners who will
* be notified when menus are hidden or shown, by sending it
* one of the messages defined in the MenuListener
* interface.
*
* @param listener the listener which should be notified
*
* @exception IllegalArgumentException
* ERROR_NULL_ARGUMENT - if the listener is null
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @see MenuListener
* @see #removeMenuListener
*/
public void addMenuListener( MenuListener listener ) {
checkWidget();
if( listener == null ) {
error( SWT.ERROR_NULL_ARGUMENT );
}
TypedListener typedListener = new TypedListener( listener );
addListener( SWT.Show, typedListener );
addListener( SWT.Hide, typedListener );
}
/**
* Removes the listener from the collection of listeners who will
* be notified when the menu events are generated for the control.
*
* @param listener the listener which should no longer be notified
*
* @exception IllegalArgumentException
* ERROR_NULL_ARGUMENT - if the listener is null
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @see MenuListener
* @see #addMenuListener
*/
public void removeMenuListener( MenuListener listener ) {
checkWidget();
if( listener == null ) {
error( SWT.ERROR_NULL_ARGUMENT );
}
removeListener( SWT.Show, listener );
removeListener( SWT.Hide, 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 HelpListener
* interface.
*
* @param listener the listener which should be notified
*
* @exception IllegalArgumentException
* ERROR_NULL_ARGUMENT - if the listener is null
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @see HelpListener
* @see #removeHelpListener
* @since 1.3
*/
public void addHelpListener( HelpListener listener ) {
checkWidget();
if( listener == null ) {
error( SWT.ERROR_NULL_ARGUMENT );
}
TypedListener typedListener = new TypedListener( listener );
addListener( SWT.Help, typedListener );
}
/**
* 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
* ERROR_NULL_ARGUMENT - if the listener is null
*
* @exception SWTException
* ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @see HelpListener
* @see #addHelpListener
* @since 1.3
*/
public void removeHelpListener( HelpListener listener ) {
checkWidget();
if( listener == null ) {
error( SWT.ERROR_NULL_ARGUMENT );
}
removeListener( SWT.Help, listener );
}
//////////////////
// Helping methods
private static Control checkNull( Control control ) {
if( control == null ) {
SWT.error( SWT.ERROR_NULL_ARGUMENT );
}
return control;
}
private static Menu checkNull( Menu menu ) {
if( menu == null ) {
SWT.error( SWT.ERROR_NULL_ARGUMENT );
}
return menu;
}
private static MenuItem checkNull( MenuItem item ) {
if( item == null ) {
SWT.error( SWT.ERROR_NULL_ARGUMENT );
}
return item;
}
private static int checkStyle( int style ) {
return checkBits( style, SWT.POP_UP, SWT.BAR, SWT.DROP_DOWN, 0, 0, 0 );
}
///////////////////
// Skinning support
@Override
void reskinChildren( int flags ) {
MenuItem[] items = getItems();
for( int i = 0; i < items.length; i++ ) {
MenuItem item = items[ i ];
item.reskin( flags );
}
super.reskinChildren( flags );
}
}
