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|
/*******************************************************************************
* Copyright (c) 2000, 2009 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.swt.widgets;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.photon.*;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.events.*;
/**
* 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>
*
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
* @noextend This class is not intended to be subclassed by clients.
*/
public class MenuItem extends Item {
Menu parent, menu;
int accelerator;
/**
* 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;
createWidget (parent.getItemCount ());
}
/**
* 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;
createWidget (index);
}
void addAccelerator () {
if (accelerator == 0) return;
int keyMods = 0;
if ((accelerator & SWT.ALT) != 0) keyMods |= OS.Pk_KM_Alt;
if ((accelerator & SWT.SHIFT) != 0) keyMods |= OS.Pk_KM_Shift;
if ((accelerator & SWT.CONTROL) != 0) keyMods |= OS.Pk_KM_Ctrl;
int key = (accelerator & ~(SWT.ALT | SWT.SHIFT | SWT.CONTROL));
int keyCode = Display.untranslateKey (key);
if (keyCode != 0) key = keyCode;
else key = Character.toLowerCase ((char)key);
Shell shell = parent.getShell ();
OS.PtAddHotkeyHandler(shell.shellHandle, key, keyMods, (short)0, handle, display.hotkeyProc);
}
/**
* 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
*/
public void addArmListener (ArmListener listener) {
checkWidget();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
TypedListener typedListener = new TypedListener (listener);
addListener (SWT.Arm, typedListener);
}
/**
* 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
*/
public void addHelpListener (HelpListener listener) {
checkWidget();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
TypedListener typedListener = new TypedListener (listener);
addListener (SWT.Help, typedListener);
}
/**
* Adds the listener to the collection of listeners who will
* be notified when the menu item is selected by the user, 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 when the menu item is selected by the user
*
* @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();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
TypedListener typedListener = new TypedListener(listener);
addListener (SWT.Selection,typedListener);
addListener (SWT.DefaultSelection,typedListener);
}
protected void checkSubclass () {
if (!isValidSubclass ()) error (SWT.ERROR_INVALID_SUBCLASS);
}
static int checkStyle (int style) {
return checkBits (style, SWT.PUSH, SWT.CHECK, SWT.RADIO, SWT.SEPARATOR, SWT.CASCADE, 0);
}
void createHandle (int index) {
state |= HANDLE;
int count = parent.getItemCount();
if (!(0 <= index && index <= count)) error (SWT.ERROR_INVALID_RANGE);
int parentHandle = parent.handle;
if ((style & SWT.SEPARATOR) != 0) {
handle = OS.PtCreateWidget (OS.PtSeparator (), parentHandle, 0, null);
} else if ((style & (SWT.CHECK | SWT.RADIO)) != 0) {
int [] args = {
OS.Pt_ARG_INDICATOR_TYPE, (style & SWT.CHECK) != 0 ? OS.Pt_N_OF_MANY : OS.Pt_ONE_OF_MANY, 0
};
handle = OS.PtCreateWidget (OS.PtToggleButton (), parentHandle, args.length / 3, args);
} else {
handle = OS.PtCreateWidget (OS.PtMenuButton (), parentHandle, 0, null);
}
if (handle == 0) error (SWT.ERROR_NO_HANDLES);
if (index != count) {
int i = 0;
int child = OS.PtWidgetChildBack (parentHandle);
/*
* Feature in Photon. Menu bars have an extra widget which
* is the parent of all menu items. PtValidParent() can not be
* used, since it does not return that widget.
*/
if (child != 0 && (parent.style & SWT.BAR) != 0) child = OS.PtWidgetChildBack (child);
while (i != index && child != 0) {
child = OS.PtWidgetBrotherInFront (child);
i++;
}
OS.PtWidgetInsert (topHandle (), child, 1);
}
if (OS.PtWidgetIsRealized (parentHandle)) {
OS.PtRealizeWidget (topHandle ());
}
}
/**
* Returns the widget accelerator. An accelerator is the bit-wise
* OR of zero or more modifier masks and a key. Examples:
* <code>SWT.CONTROL | SWT.SHIFT | 'T', SWT.ALT | SWT.F2</code>.
* The default value is zero, indicating that the menu item does
* not have an accelerator.
*
* @return the accelerator or 0
*
* </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 getAccelerator () {
checkWidget();
return accelerator;
}
/**
* 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 ();
/*
* Bug in Photon. The Pt_BLOCKED flag of a menu item is cleared
* when its parent menu is realized. The fix is to remember
* the menu item state and reset it when the menu item is
* realized.
*/
// int topHandle = topHandle ();
// return (OS.PtWidgetFlags (topHandle) & OS.Pt_BLOCKED) == 0;
return (state & DISABLED) == 0;
}
/**
* 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;
}
String getNameText () {
if ((style & SWT.SEPARATOR) != 0) return "|";
return super.getNameText ();
}
/**
* 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;
}
/**
* 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();
if ((style & (SWT.CHECK | SWT.RADIO | SWT.TOGGLE)) == 0) return false;
return (OS.PtWidgetFlags (handle) & OS.Pt_SET) != 0;
}
void hookEvents () {
if ((style & SWT.SEPARATOR) != 0) return;
int windowProc = display.windowProc;
if ((style & SWT.CASCADE) != 0) {
OS.PtAddCallback (handle, OS.Pt_CB_ARM, windowProc, OS.Pt_CB_ARM);
}
OS.PtAddCallback (handle, OS.Pt_CB_ACTIVATE, windowProc, OS.Pt_CB_ACTIVATE);
if ((parent.style & SWT.BAR) == 0) {
OS.PtAddCallback (handle, OS.Pt_CB_REALIZED, windowProc, OS.Pt_CB_REALIZED);
}
}
int hotkeyProc (int widget, int data, int info) {
showMenu ();
return OS.Pt_CONTINUE;
}
/**
* 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 ();
}
int Pt_CB_ACTIVATE (int widget, int info) {
if ((style & SWT.CASCADE) != 0 && menu != null) {
return OS.Pt_CONTINUE;
}
Event event = new Event ();
if (info != 0) {
PtCallbackInfo_t cbinfo = new PtCallbackInfo_t ();
OS.memmove (cbinfo, info, PtCallbackInfo_t.sizeof);
if (cbinfo.event != 0) {
PhEvent_t ev = new PhEvent_t ();
OS.memmove (ev, cbinfo.event, PhEvent_t.sizeof);
int data = OS.PhGetData (cbinfo.event);
if (data != 0) {
switch (ev.type) {
case OS.Ph_EV_KEY:
PhKeyEvent_t ke = new PhKeyEvent_t ();
OS.memmove (ke, data, PhKeyEvent_t.sizeof);
setInputState (event, SWT.Selection, ke.key_mods, ke.button_state);
break;
case OS.Ph_EV_BUT_PRESS:
case OS.Ph_EV_BUT_RELEASE:
PhPointerEvent_t pe = new PhPointerEvent_t ();
OS.memmove (pe, data, PhPointerEvent_t.sizeof);
setInputState (event, SWT.Selection, pe.key_mods, pe.button_state);
break;
}
}
}
}
if ((style & SWT.RADIO) != 0) {
if ((parent.getStyle () & SWT.NO_RADIO_GROUP) == 0) {
selectRadio ();
}
}
postEvent (SWT.Selection, event);
return OS.Pt_CONTINUE;
}
int Pt_CB_ARM (int widget, int info) {
sendEvent (SWT.Arm);
showMenu ();
return OS.Pt_CONTINUE;
}
int Pt_CB_REALIZED (int widget, int info) {
/*
* Bug in Photon. The Pt_BLOCKED flag of a menu item is cleared
* when its parent menu is realized. The fix is to remember
* the menu item state and reset it when the menu item is
* realized.
*/
int topHandle = topHandle ();
int flags = (state & DISABLED) != 0 ? OS.Pt_BLOCKED | OS.Pt_GHOST : 0;
OS.PtSetResource (topHandle, OS.Pt_ARG_FLAGS, flags, OS.Pt_BLOCKED | OS.Pt_GHOST);
return OS.Pt_CONTINUE;
}
void releaseChildren (boolean destroy) {
if (menu != null && !menu.isDisposed ()) {
menu.release (false);
menu = null;
}
super.releaseChildren (destroy);
}
void releaseParent () {
super.releaseParent ();
if (menu != null) menu.dispose ();
menu = null;
}
void releaseWidget () {
super.releaseWidget ();
if (accelerator != 0) removeAccelerator ();
accelerator = 0;
parent = null;
}
/**
* 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
*/
public void removeArmListener (ArmListener listener) {
checkWidget();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
if (eventTable == null) return;
eventTable.unhook (SWT.Arm, 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
*/
public void removeHelpListener (HelpListener listener) {
checkWidget();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
if (eventTable == null) return;
eventTable.unhook (SWT.Help, listener);
}
void removeAccelerator () {
if (accelerator == 0) return;
int keyMods = 0;
if ((accelerator & SWT.ALT) != 0) keyMods |= OS.Pk_KM_Alt;
if ((accelerator & SWT.SHIFT) != 0) keyMods |= OS.Pk_KM_Shift;
if ((accelerator & SWT.CONTROL) != 0) keyMods |= OS.Pk_KM_Ctrl;
int key = (accelerator & ~(SWT.ALT | SWT.SHIFT | SWT.CONTROL));
int keyCode = Display.untranslateKey (key);
if (keyCode != 0) key = keyCode;
else key = Character.toLowerCase ((char)key);
Shell shell = parent.getShell ();
OS.PtRemoveHotkeyHandler(shell.shellHandle, key, keyMods, (short)0, handle, display.hotkeyProc);
}
/**
* Removes the listener from the collection of listeners who will
* be notified when the control is selected by the user.
*
* @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();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
if (eventTable == null) return;
eventTable.unhook (SWT.Selection, listener);
eventTable.unhook (SWT.DefaultSelection,listener);
}
void reskinChildren (int flags) {
if (menu != null) {
menu.reskin (flags);
}
super.reskinChildren (flags);
}
void selectRadio () {
int index = 0;
MenuItem [] items = parent.getItems ();
while (index < items.length && items [index] != this) index++;
int i = index - 1;
while (i >= 0 && items [i].setRadioSelection (false)) --i;
int j = index + 1;
while (j < items.length && items [j].setRadioSelection (false)) j++;
setSelection (true);
}
/**
* Sets the widget accelerator. An accelerator is the bit-wise
* OR of zero or more modifier masks and a key. Examples:
* <code>SWT.MOD1 | SWT.MOD2 | 'T', SWT.MOD3 | SWT.F2</code>.
* <code>SWT.CONTROL | SWT.SHIFT | 'T', SWT.ALT | SWT.F2</code>.
* The default value is zero, indicating that the menu item does
* not have an accelerator.
*
* @param accelerator an integer that is the bit-wise OR of masks and a key
*
* </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 setAccelerator (int accelerator) {
checkWidget();
if (this.accelerator == accelerator) return;
removeAccelerator ();
this.accelerator = accelerator;
addAccelerator ();
}
/**
* 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 ();
if (enabled) {
state &= ~DISABLED;
} else {
state |= DISABLED;
}
int topHandle = topHandle ();
int flags = (state & DISABLED) != 0 ? OS.Pt_BLOCKED | OS.Pt_GHOST : 0;
OS.PtSetResource (topHandle, OS.Pt_ARG_FLAGS, flags, OS.Pt_BLOCKED | OS.Pt_GHOST);
}
/**
* 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).
* Furthermore, some platforms (such as GTK), cannot display both
* a check box and an image at the same time. Instead, they hide
* the image and display the check box.
* </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) return;
if (this.image == image) return;
super.setImage (image);
if ((style & (SWT.CHECK | SWT.RADIO)) != 0) return;
int imageHandle = 0;
int type = OS.Pt_Z_STRING;
if (image != null) {
imageHandle = copyPhImage (image.handle);
if (text.length () != 0) type = OS.Pt_TEXT_IMAGE;
else type = OS.Pt_IMAGE;
} else {
/*
* Bug in Photon. Photon will segment fault, if Pt_ARG_LABEL_IMAGE
* is set to NULL. This means that after setting an image into a
* PtMenuButton, it can never be removed. The fix is to set it to
* a small blank image.
*/
imageHandle = copyPhImage (display.nullImage);
}
int [] args = {
OS.Pt_ARG_LABEL_IMAGE, imageHandle, 0,
OS.Pt_ARG_LABEL_TYPE, type, 0,
};
OS.PtSetResources (handle, args.length / 3, args);
if (imageHandle != 0) OS.free (imageHandle);
/*
* Bug on Photon. When a the text is set on a menu
* item that is realized, the menu item does not resize
* to show the new text. The fix is to force the item
* to recalculate the size.
*/
if (OS.PtWidgetIsRealized (handle)) OS.PtExtentWidgetFamily (parent.handle);
}
/**
* 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 ((style & SWT.CASCADE) == 0) {
error (SWT.ERROR_MENUITEM_NOT_CASCADE);
}
if (menu != null) {
if (menu.isDisposed()) error(SWT.ERROR_INVALID_ARGUMENT);
if ((menu.style & SWT.DROP_DOWN) == 0) {
error (SWT.ERROR_MENU_NOT_DROP_DOWN);
}
if (menu.parent != parent.parent) {
error (SWT.ERROR_INVALID_PARENT);
}
}
Menu oldMenu = this.menu;
if (oldMenu == menu) return;
this.menu = menu;
if (oldMenu != null) {
oldMenu.cascade = null;
if ((parent.style & SWT.BAR) == 0) {
OS.PtSetResource (handle, OS.Pt_ARG_BUTTON_TYPE, OS.Pt_MENU_TEXT, 0);
}
}
if (menu != null) {
menu.cascade = this;
if ((parent.style & SWT.BAR) == 0) {
OS.PtSetResource (handle, OS.Pt_ARG_BUTTON_TYPE, OS.Pt_MENU_RIGHT, 0);
}
}
}
boolean setRadioSelection (boolean value) {
if ((style & SWT.RADIO) == 0) return false;
if (getSelection () != value) {
setSelection (value);
postEvent (SWT.Selection);
}
return true;
}
/**
* 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 selected 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 selected) {
checkWidget();
if ((style & (SWT.CHECK | SWT.RADIO | SWT.TOGGLE)) == 0) return;
OS.PtSetResource (handle, OS.Pt_ARG_FLAGS, selected ? OS.Pt_SET : 0, OS.Pt_SET);
}
/**
* Sets the receiver's text. The string may include
* the mnemonic character and accelerator text.
* <p>
* Mnemonics are indicated by an '&' that causes the next
* character to be the mnemonic. When the user presses a
* key sequence that matches the mnemonic, a selection
* event occurs. On most platforms, the mnemonic appears
* underlined but may be emphasised in a platform specific
* manner. The mnemonic indicator character '&' can be
* escaped by doubling it in the string, causing a single
* '&' to be displayed.
* </p>
* <p>
* Accelerator text is indicated by the '\t' character.
* On platforms that support accelerator text, the text
* that follows the '\t' character is displayed to the user,
* typically indicating the key stroke that will cause
* the item to become selected. On most platforms, the
* accelerator text appears right aligned in the menu.
* Setting the accelerator text does not install the
* accelerator key sequence. The accelerator key sequence
* is installed using #setAccelerator.
* </p>
*
* @param string the new text
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the text 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 #setAccelerator
*/
public void setText (String string) {
checkWidget();
if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
super.setText (string);
char [] text = new char [string.length ()];
string.getChars (0, text.length, text, 0);
boolean accel = false;
int i=0, j=0;
char mnemonic=0;
while (i < text.length) {
if (text [i] == '\t') {accel = true; break;}
if ((text [j++] = text [i++]) == '&') {
if (i == text.length) {continue;}
if (text [i] == '&') {i++; continue;}
if (mnemonic == 0) mnemonic = text [i];
j--;
}
}
int keyMods = 0;
byte [] buffer2 = new byte [1];
if (accel && ++i < text.length) {
int start = i;
// while (i < text.length) {
// if (text [i] == '+') {
// String str = new String (text, start, i - start);
// if (str.equals ("Ctrl")) keyMods |= OS.Pk_KM_Ctrl;
// if (str.equals ("Shift")) keyMods |= OS.Pk_KM_Shift;
// if (str.equals ("Alt")) keyMods |= OS.Pk_KM_Alt;
// start = i + 1;
// }
// i++;
// }
if (start < text.length) {
char [] accelText = new char [text.length - start];
System.arraycopy (text, start, accelText, 0, accelText.length);
buffer2 = Converter.wcsToMbcs (null, accelText, true);
}
}
while (j < text.length) text [j++] = 0;
byte [] buffer1 = Converter.wcsToMbcs (null, text, true);
int ptr1 = OS.malloc (buffer1.length);
OS.memmove (ptr1, buffer1, buffer1.length);
int ptr2 = OS.malloc (buffer2.length);
OS.memmove (ptr2, buffer2, buffer2.length);
int ptr3 = 0;
if (mnemonic != 0) {
byte [] buffer3 = Converter.wcsToMbcs (null, new char []{mnemonic}, true);
ptr3 = OS.malloc (buffer3.length);
OS.memmove (ptr3, buffer3, buffer3.length);
}
if ((parent.style & SWT.BAR) != 0) {
replaceMnemonic (mnemonic, false, true);
}
int type = OS.Pt_Z_STRING;
if ((style & SWT.PUSH) != 0) {
if (image != null) type = OS.Pt_TEXT_IMAGE;
}
int [] args = {
OS.Pt_ARG_TEXT_STRING, ptr1, 0,
OS.Pt_ARG_ACCEL_TEXT, ptr2, 0,
OS.Pt_ARG_MODIFIER_KEYS, keyMods, keyMods,
OS.Pt_ARG_ACCEL_KEY, ptr3, 0,
OS.Pt_ARG_LABEL_TYPE, type, 0,
};
OS.PtSetResources (handle, args.length / 3, args);
OS.free (ptr1);
OS.free (ptr2);
OS.free (ptr3);
/*
* Bug on Photon. When a the text is set on a menu
* item that is realized, the menu item does not resize
* to show the new text. The fix is to force the item
* to recalculate the size.
*/
if (OS.PtWidgetIsRealized (handle)) OS.PtExtentWidgetFamily (parent.handle);
}
void showMenu() {
if (menu == null) return;
int menuHandle = menu.handle;
if (!OS.PtWidgetIsRealized (menuHandle)) {
if ((parent.style & SWT.BAR) == 0) {
OS.PtSetResource (menuHandle, OS.Pt_ARG_MENU_FLAGS, OS.Pt_MENU_CHILD, OS.Pt_MENU_CHILD);
}
OS.PtReParentWidget (menuHandle, handle);
/*
* Bug in Photon. PtPositionMenu does not position the menu
* properly when the menu is a direct child a menu bar item.
* The fix is to position the menu ourselfs.
*/
if ((parent.style & SWT.BAR) != 0) {
PhPoint_t pt = new PhPoint_t ();
short [] x = new short [1], y = new short [1];
OS.PtGetAbsPosition (handle, x, y);
pt.x = x [0];
pt.y = y [0];
int [] args = {OS.Pt_ARG_HEIGHT, 0, 0};
OS.PtGetResources (handle, args.length / 3, args);
pt.y += args [1];
int ptr = OS.malloc (PhPoint_t.sizeof);
OS.memmove (ptr, pt, PhPoint_t.sizeof);
OS.PtSetResource (menuHandle, OS.Pt_ARG_POS, ptr, 0);
OS.free (ptr);
} else {
OS.PtPositionMenu (menuHandle, null);
}
menu.sendEvent (SWT.Show);
OS.PtRealizeWidget (menuHandle);
}
}
}
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