/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.widgets;
import org.eclipse.swt.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.graphics.*;
/**
* Instances of this class represent a selectable user interface object
* corresponding to a tab for a page in a tab folder.
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>(none)</dd>
* <dt><b>Events:</b></dt>
* <dd>(none)</dd>
* </dl>
* <p>
* IMPORTANT: This class is <em>not</em> intended to be subclassed.
* </p>
*/
public class TabItem extends Item {
int /*long*/ labelHandle, imageHandle, pageHandle;
Control control;
TabFolder parent;
String toolTipText;
/**
* Constructs a new instance of this class given its parent
* (which must be a <code>TabFolder</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 composite 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
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public TabItem (TabFolder parent, int style) {
super (parent, style);
this.parent = parent;
createWidget (parent.getItemCount ());
}
/**
* Constructs a new instance of this class given its parent
* (which must be a <code>TabFolder</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 composite control which will be the parent of the new instance (cannot be null)
* @param style the style of control to construct
* @param index the 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 either negative or greater than the parent's current tab count</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
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public TabItem (TabFolder parent, int style, int index) {
super (parent, style);
this.parent = parent;
createWidget (index);
}
void createWidget (int index) {
parent.createItem (this, index);
hookEvents ();
register ();
text = "";
}
void deregister() {
super.deregister ();
if (labelHandle != 0) display.removeWidget (labelHandle);
}
/**
* Returns the control that is used to fill the client area of
* the tab folder when the user selects the tab item. If no
* control has been set, return <code>null</code>.
* <p>
* @return the control
*
* @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 Control getControl () {
checkWidget ();
return control;
}
/**
* Returns the receiver's parent, which must be a <code>TabFolder</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 TabFolder getParent () {
checkWidget ();
return parent;
}
/**
* Returns the receiver's tool tip text, or null if it has
* not been set.
*
* @return the receiver's tool tip text
*
* @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 String getToolTipText () {
checkWidget ();
return toolTipText;
}
int /*long*/ gtk_mnemonic_activate (int /*long*/ widget, int /*long*/ arg1) {
return parent.gtk_mnemonic_activate (widget, arg1);
}
void hookEvents () {
super.hookEvents ();
if (labelHandle != 0) OS.g_signal_connect (labelHandle, OS.mnemonic_activate, display.windowProc3, MNEMONIC_ACTIVATE);
}
void register () {
super.register ();
if (labelHandle != 0) display.addWidget (labelHandle, this);
}
void releaseChild () {
super.releaseChild ();
int index = parent.indexOf (this);
if (index == parent.getSelectionIndex ()) {
if (control != null) control.setVisible (false);
}
parent.destroyItem (this);
}
void releaseHandle () {
super.releaseHandle ();
pageHandle = labelHandle = imageHandle = 0;
}
void releaseWidget () {
super.releaseWidget ();
parent = null;
}
/**
* Sets the control that is used to fill the client area of
* the tab folder when the user selects the tab item.
* <p>
* @param control the new control (or null)
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the control has been disposed</li>
* <li>ERROR_INVALID_PARENT - if the control 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 setControl (Control control) {
checkWidget ();
if (control != null) {
if (control.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT);
if (control.parent != parent) error (SWT.ERROR_INVALID_PARENT);
}
Control oldControl = this.control, newControl = control;
this.control = control;
int index = parent.indexOf (this);
if (index != parent.getSelectionIndex ()) {
if (newControl != null) newControl.setVisible (false);
return;
}
if (newControl != null) {
newControl.setBounds (parent.getClientArea ());
newControl.setVisible (true);
}
if (oldControl != null) oldControl.setVisible (false);
}
void setFontDescription (int /*long*/ font) {
OS.gtk_widget_modify_font (labelHandle, font);
OS.gtk_widget_modify_font (imageHandle, font);
}
void setForegroundColor (GdkColor color) {
OS.gtk_widget_modify_fg (labelHandle, OS.GTK_STATE_NORMAL, color);
OS.gtk_widget_modify_fg (imageHandle, OS.GTK_STATE_NORMAL, color);
}
public void setImage (Image image) {
checkWidget ();
super.setImage (image);
if (image != null) {
OS.gtk_image_set_from_pixmap (imageHandle, image.pixmap, image.mask);
OS.gtk_widget_show (imageHandle);
} else {
OS.gtk_image_set_from_pixmap (imageHandle, 0, 0);
OS.gtk_widget_hide (imageHandle);
}
parent.fixPage ();
}
/**
* Sets the receiver's text. The string may include
* the mnemonic character.
* </p>
* <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>
*
* @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>
*
*/
public void setText (String string) {
checkWidget ();
if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
super.setText (string);
char [] chars = fixMnemonic (string);
byte [] buffer = Converter.wcsToMbcs (null, chars, true);
OS.gtk_label_set_text_with_mnemonic (labelHandle, buffer);
if (string.length () != 0) {
OS.gtk_widget_show (labelHandle);
} else {
OS.gtk_widget_hide (labelHandle);
}
parent.fixPage ();
}
/**
* Sets the receiver's tool tip text to the argument, which
* may be null indicating that no tool tip text should be shown.
*
* @param string the new tool tip text (or null)
*
* @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 setToolTipText (String string) {
checkWidget ();
toolTipText = string;
}
}
