/*******************************************************************************
* Copyright (c) 2000, 2007 IBM Corporation and others.
* Portion Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
* 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
* Nokia Corporation - Qt implementation
*******************************************************************************/
package org.eclipse.swt.widgets;
import org.eclipse.swt.internal.qt.OS;
import org.eclipse.swt.internal.qt.WidgetState;
import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
/**
* Instances of this class are user interface objects that contain
* menu items.
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>BAR, DROP_DOWN, POP_UP, NO_RADIO_GROUP</dd>
* <dd>LEFT_TO_RIGHT, RIGHT_TO_LEFT</dd>
* <dt><b>Events:</b></dt>
* <dd>Hide, Show </dd>
* </dl>
* <p>
* 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.
* </p><p>
* IMPORTANT: This class is <em>not</em> intended to be subclassed.
* </p>
*/
public class Menu extends Widget {
//Handle for the QActionGroup used for SWT.RADIO style menus.
int actionGroupHandle;
int x, y;
int itemCount;
boolean hasLocation;
MenuItem cascade;
Decorations parent;
/**
* 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 <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#POP_UP
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public Menu (Control parent) {
this (checkNull (parent).menuShell (), SWT.POP_UP);
}
/**
* Constructs a new instance of this class given its parent
* (which must be a <code>Decorations</code>) and a style value
* describing its behavior and appearance.
* <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 decorations control which will be the parent of the new instance (cannot be null)
* @param style the style of menu 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#BAR
* @see SWT#DROP_DOWN
* @see SWT#POP_UP
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public Menu (Decorations parent, int style) {
super (parent, checkStyle (style));
this.parent = parent;
createWidget (0);
}
/**
* Constructs a new instance of this class given its parent
* (which must be a <code>Menu</code>) and sets the style
* for the instance so that the instance will be a drop-down
* menu on the given parent's parent.
*
* @param parentMenu a menu which will be the parent of the new instance (cannot be null)
*
* @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#DROP_DOWN
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public Menu (Menu parentMenu) {
this (checkNull (parentMenu).parent, SWT.DROP_DOWN);
}
/**
* Constructs a new instance of this class given its parent
* (which must be a <code>MenuItem</code>) 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 parentItem a menu item which will be the parent of the new instance (cannot be null)
*
* @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#DROP_DOWN
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public Menu (MenuItem parentItem) {
this (checkNull (parentItem).parent);
}
static Control checkNull (Control control) {
if (control == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
return control;
}
static Menu checkNull (Menu menu) {
if (menu == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
return menu;
}
static MenuItem checkNull (MenuItem item) {
if (item == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
return item;
}
static int checkStyle (int style) {
return checkBits (style, SWT.POP_UP, SWT.BAR, SWT.DROP_DOWN, 0, 0, 0);
}
/**
* 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 <code>MenuListener</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 MenuListener
* @see #removeMenuListener
*/
public void addMenuListener (MenuListener listener) {
checkWidget();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
TypedListener typedListener = new TypedListener (listener);
addListener (SWT.Hide,typedListener);
addListener (SWT.Show,typedListener);
}
void createHandle_pp (int index) {
if ((style & SWT.BAR) != 0) {
handle = OS.QMenuBar_new( parent.topHandle );
} else {
handle = OS.QMenu_new( parent.handle );
}
if((style & SWT.RIGHT_TO_LEFT) != 0) {
OS.QWidget_setLayoutDirection(handle, OS.QT_RIGHTTOLEFT);
} else {
OS.QWidget_setLayoutDirection(handle, OS.QT_LEFTTORIGHT);
}
topHandle = handle;
state |= WidgetState.HANDLE;
}
void createWidget (int index) {
checkOrientation (parent);
super.createWidget (index);
parent.addMenu (this);
}
void fixMenus (Decorations newParent) {
// Commented for now, needed for the reparenting of the Controls.
//
// MenuItem [] items = getItems ();
// for (int i=0; i<items.length; i++) {
// items [i].fixMenus (newParent);
// }
// parent.removeMenu (this);
// newParent.addMenu (this);
// this.parent = newParent;
}
/**
* Returns the default menu item or null if none has
* been previously set.
*
* @return the default menu item.
*
* </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 MenuItem getDefaultItem () {
checkWidget();
int actionHandle = OS.QMenu_defaultAction( handle );
Widget widget = Display.getWidget( actionHandle );
if( widget != null){
if (MenuItem.class.isInstance( widget ))
return (MenuItem)widget;
}
return null;
}
/**
* Returns <code>true</code> if the receiver is enabled, and
* <code>false</code> 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 <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 OS.QWidget_isEnabled( handle );
}
/**
* 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 <ul>
* <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</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 MenuItem getItem (int index) {
checkWidget();
if(index < 0) error (SWT.ERROR_INVALID_RANGE);
int[] actions = OS.QWidget_actions(handle);
int indexOfLastMenuItem = -1;
MenuItem itemAtIndex = null;
for(int i = 0; i < actions.length; ++i) {
Widget widget = Display.getWidget(actions[i]);
if(widget != null && widget instanceof MenuItem) {
if(++indexOfLastMenuItem == index) {
itemAtIndex = (MenuItem)widget;
break;
}
}
}
if(index > indexOfLastMenuItem) {
error (SWT.ERROR_INVALID_RANGE);
}
return itemAtIndex;
}
/**
* Returns the number of items contained in the receiver.
*
* @return the number of items
*
* @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 int getItemCount () {
checkWidget();
return itemCount;
}
/**
* Returns a (possibly empty) array of <code>MenuItem</code>s which
* are the items in the receiver.
* <p>
* 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.
* </p>
*
* @return the items in 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>
*/
public MenuItem [] getItems () {
checkWidget();
int[] handles = OS.QWidget_actions( handle );
int count = handles.length;
if (count == 0) return new MenuItem [0];
MenuItem [] children = new MenuItem [count];
int items = 0;
for( int i = 0; i < count; ++i) {
int handle = handles[i];
if (handle != 0) {
Widget widget = Display.getWidget (handle);
if (widget != null && widget != this) {
if (widget instanceof MenuItem) {
children [items++] = (MenuItem) widget;
}
}
}
}
if (items == count) return children;
MenuItem [] newChildren = new MenuItem [items];
System.arraycopy (children, 0, newChildren, 0, items);
return newChildren;
}
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;
}
/**
* Returns the receiver's parent, which must be a <code>Decorations</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 Decorations getParent () {
checkWidget();
return parent;
}
/**
* Returns the receiver's parent item, which must be a
* <code>MenuItem</code> or null when the receiver is a
* root.
*
* @return the receiver's parent item
*
* @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 MenuItem getParentItem () {
checkWidget();
return cascade;
}
/**
* Returns the receiver's parent item, which must be a
* <code>Menu</code> or null when the receiver is a
* root.
*
* @return the receiver's parent item
*
* @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 getParentMenu () {
checkWidget();
if (cascade == null) return null;
return cascade.getParent ();
}
/**
* 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 <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 #getParent
*/
public Shell getShell () {
checkWidget();
return parent.getShell ();
}
/**
* Returns <code>true</code> if the receiver is visible, and
* <code>false</code> otherwise.
* <p>
* 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.
* </p>
*
* @return the receiver's visibility 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 getVisible () {
checkWidget();
return (!OS.QWidget_isHidden( handle ));
}
void qt_signal_aboutToHide() {
sendEvent (SWT.Hide);
}
void qt_signal_aboutToShow() {
sendEvent (SWT.Show);
}
void hookEvents_pp () {
super.hookEvents_pp ();
if ((style & SWT.BAR) == 0) {
int aboutToHideProxy = OS.SignalHandler_new(handle, OS.QSIGNAL_ABOUTTOHIDE);
OS.QObject_connectOrThrow(handle, "aboutToHide()", aboutToHideProxy, "widgetSignal()", OS.QT_AUTOCONNECTION);
int aboutToShowProxy = OS.SignalHandler_new(handle, OS.QSIGNAL_ABOUTTOSHOW);
OS.QObject_connectOrThrow(handle, "aboutToShow()", aboutToShowProxy, "widgetSignal()", OS.QT_AUTOCONNECTION);
}
}
/**
* 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 item the search item
* @return the index of the item
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the item 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>
*/
public int indexOf (MenuItem item) {
checkWidget();
if (item == null) error (SWT.ERROR_NULL_ARGUMENT);
MenuItem [] items = getItems ();
for (int i=0; i<items.length; i++) {
if (items [i] == item) return i;
}
return -1;
}
/**
* 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 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 () {
checkWidget();
Menu parentMenu = getParentMenu ();
if (parentMenu == null) {
return getEnabled () && parent.isEnabled ();
}
return getEnabled () && parentMenu.isEnabled ();
}
/**
* Returns <code>true</code> if the receiver is visible and all
* of the receiver's ancestors are visible and <code>false</code>
* otherwise.
*
* @return the receiver's visibility 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 #getVisible
*/
public boolean isVisible () {
checkWidget();
return OS.QWidget_isVisible( handle );
}
void menuItemAdded() {
itemCount++;
}
void menuItemRemoved() {
itemCount = Math.max(--itemCount, 0);
}
void releaseChildren_pp (boolean destroy) {
MenuItem [] items = getItems ();
for (int i=0; i<items.length; i++) {
MenuItem item = items [i];
if (item != null && !item.isDisposed ()) {
item.release (false);
}
}
super.releaseChildren_pp (destroy);
}
void releaseParent_pp () {
super.releaseParent_pp ();
if (cascade != null) cascade.setMenu (null);
if ((style & SWT.BAR) != 0 && this == parent.menuBar) {
parent.setMenuBar (null);
}
}
void releaseWidget_pp () {
super.releaseWidget_pp ();
if (parent != null) parent.removeMenu (this);
parent = null;
cascade = null;
}
/**
* 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 <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 MenuListener
* @see #addMenuListener
*/
public void removeMenuListener (MenuListener listener) {
checkWidget();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
if (eventTable == null) return;
eventTable.unhook (SWT.Hide, listener);
eventTable.unhook (SWT.Show, listener);
}
/**
* Sets the default menu item to the argument or removes
* the default emphasis when the argument is <code>null</code>.
*
* @param item the default menu item or null
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the menu item has been disposed</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 setDefaultItem (MenuItem item) {
checkWidget();
if (item != null) {
if (item.isDisposed()) error(SWT.ERROR_INVALID_ARGUMENT);
if (item.parent != this) return;
OS.QMenu_setDefaultAction( handle, item.handle);
}
else{
OS.QMenu_setDefaultAction(handle, 0);
}
}
/**
* Enables the receiver if the argument is <code>true</code>,
* 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 <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();
OS.QWidget_setEnabled( handle, enabled );
}
/**
* Sets the location of the receiver, which must be a popup,
* to the point specified by the arguments which are relative
* to the display.
* <p>
* Note that this is different from most widgets where the
* location of the widget is relative to the parent.
* </p><p>
* Note that the platform window manager ultimately has control
* over the location of popup menus.
* </p>
*
* @param x the new x coordinate for the receiver
* @param y the new y coordinate for 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>
*/
public void setLocation (int x, int y) {
checkWidget();
if ((style & (SWT.BAR | SWT.DROP_DOWN)) != 0) return;
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.
* <p>
* Note that this is different from most widgets where the
* location of the widget is relative to the parent.
* </p><p>
* Note that the platform window manager ultimately has control
* over the location of popup menus.
* </p>
*
* @param location the new location for the receiver
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the point 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>
*
* @since 2.1
*/
public void setLocation (Point location) {
checkWidget();
if (location == null) error (SWT.ERROR_NULL_ARGUMENT);
setLocation (location.x, location.y);
}
/**
* Marks the receiver as visible if the argument is <code>true</code>,
* and marks it invisible otherwise.
* <p>
* 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.
* </p>
*
* @param visible the new visibility 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 setVisible (boolean visible) {
checkWidget();
if ((style & (SWT.BAR | SWT.DROP_DOWN)) != 0) return;
if (visible) {
OS.QMenu_popup(handle, x, y, 0);
} else {
OS.QWidget_setVisible(handle, visible);
}
}
}