/*******************************************************************************
* 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.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.carbon.OS;
import org.eclipse.swt.internal.carbon.ControlTabInfoRecV1;
import org.eclipse.swt.internal.carbon.ControlButtonContentInfo;
import org.eclipse.swt.internal.carbon.Rect;
/**
* 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>
*
* @see <a href="http://www.eclipse.org/swt/snippets/#tabfolder">TabFolder, TabItem snippets</a>
* @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 TabItem extends Item {
TabFolder parent;
Control control;
String toolTipText;
static final int EXTRA_WIDTH = 25;
/**
* 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;
parent.createItem (this, 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 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
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public TabItem (TabFolder parent, int style, int index) {
super (parent, style);
this.parent = parent;
parent.createItem (this, index);
}
int calculateWidth (GC gc) {
int width = 0;
Image image = getImage ();
String text = getText ();
if (image != null) width = image.getBounds ().width + 2;
if (text != null && text.length () > 0) width += gc.stringExtent (text).x;
return width + EXTRA_WIDTH;
}
protected void checkSubclass () {
if (!isValidSubclass ()) error (SWT.ERROR_INVALID_SUBCLASS);
}
void destroyWidget () {
parent.destroyItem (this);
releaseHandle ();
}
/**
* Returns a rectangle describing the receiver's size and location
* relative to its parent.
*
* @return the receiver's bounding rectangle
*
* @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 3.4
*/
public Rectangle getBounds() {
checkWidget ();
int index = parent.indexOf (this);
if (index == -1) return new Rectangle (0, 0, 0, 0);
int rgnHandle = OS.NewRgn ();
OS.GetControlRegion (parent.handle, (short) (index + 1), rgnHandle);
Rect rect = new Rect ();
OS.GetRegionBounds (rgnHandle, rect);
OS.DisposeRgn (rgnHandle);
return new Rectangle (rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top);
}
/**
* 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;
}
void releaseHandle () {
super.releaseHandle ();
parent = null;
}
void releaseParent () {
super.releaseParent ();
int index = parent.indexOf (this);
if (index == parent.getSelectionIndex ()) {
if (control != null) control.setVisible (false);
}
}
void releaseWidget () {
super.releaseWidget ();
control = 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);
}
if (this.control != null && this.control.isDisposed ()) {
this.control = null;
}
Control oldControl = this.control, newControl = control;
this.control = control;
int index = parent.indexOf (this), selectionIndex = parent.getSelectionIndex();
if (index != selectionIndex) {
if (newControl != null) {
if (selectionIndex != -1) {
Control selectedControl = parent.getItem(selectionIndex).getControl();
if (selectedControl == newControl) return;
}
newControl.setVisible(false);
return;
}
}
if (newControl != null) {
newControl.setBounds (parent.getClientArea ());
newControl.setVisible (true);
}
if (oldControl != null) oldControl.setVisible (false);
}
public void setImage (Image image) {
checkWidget ();
int index = parent.indexOf (this);
if (index == -1) return;
super.setImage (image);
ControlButtonContentInfo inContent = new ControlButtonContentInfo ();
if (image == null) {
inContent.contentType = (short)OS.kControlContentTextOnly;
} else {
inContent.contentType = (short)OS.kControlContentCGImageRef;
inContent.iconRef = image.handle;
}
OS.SetControlData (parent.handle, index+1, OS.kControlTabImageContentTag, ControlButtonContentInfo.sizeof, inContent);
parent.redraw ();
}
/**
* 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);
int index = parent.indexOf (this);
if (index == -1) return;
super.setText (string);
char [] buffer = new char [text.length ()];
text.getChars (0, buffer.length, buffer, 0);
int length = fixMnemonic (buffer);
int ptr = OS.CFStringCreateWithCharacters (OS.kCFAllocatorDefault, buffer, length);
if (ptr == 0) error (SWT.ERROR_CANNOT_SET_TEXT);
ControlTabInfoRecV1 tab = new ControlTabInfoRecV1 ();
tab.version= (short) OS.kControlTabInfoVersionOne;
tab.iconSuiteID = 0;
tab.name = ptr;
OS.SetControlData (parent.handle, index+1, OS.kControlTabInfoTag, ControlTabInfoRecV1.sizeof, tab);
OS.CFRelease (ptr);
if (image != null) {
ControlButtonContentInfo inContent = new ControlButtonContentInfo ();
inContent.contentType = (short)OS.kControlContentCGImageRef;
inContent.iconRef = image.handle;
OS.SetControlData (parent.handle, index+1, OS.kControlTabImageContentTag, ControlButtonContentInfo.sizeof, inContent);
}
}
/**
* Sets the receiver's tool tip text to the argument, which
* may be null indicating that the default tool tip for the
* control will be shown. For a control that has a default
* tool tip, such as the Tree control on Windows, setting
* the tool tip text to an empty string replaces the default,
* causing no tool tip text to be shown.
* <p>
* The mnemonic indicator (character '&') is not displayed in a tool tip.
* To display a single '&' in the tool tip, the character '&' can be
* escaped by doubling it in the string.
* </p>
*
* @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;
}
void update () {
setText (text);
setImage (image);
setToolTipText (toolTipText);
}
}