/*******************************************************************************
* Copyright (c) 2012 Laurent CARON. 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: Laurent CARON (laurent.caron at gmail dot com) - initial API and implementation
*******************************************************************************/
package org.mihalis.opal.roundedToolbar;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Item;
import org.eclipse.swt.widgets.Widget;
import org.mihalis.opal.utils.AdvancedPath;
import org.mihalis.opal.utils.SWTGraphicUtil;
/**
* Instances of this class represent a selectable user interface object that
* represents a button in a rounded tool bar.
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>(none)</dd>
* <dt><b>Events:</b></dt>
* <dd>Selection</dd>
* </dl>
*
* @see <a href="http://www.eclipse.org/swt/snippets/#toolbar">ToolBar, ToolItem
* snippets</a>
*/
public class RoundedToolItem extends Item {
private static final int MARGIN = 4;
private static Color START_GRADIENT_COLOR = SWTGraphicUtil.getColorSafely(70, 70, 70);
private static Color END_GRADIENT_COLOR = SWTGraphicUtil.getColorSafely(116, 116, 116);
private final RoundedToolbar parentToolbar;
private final List<SelectionListener> selectionListeners;
private Rectangle bounds;
private boolean enabled;
private boolean selection;
private int width;
private int height;
private Image disabledImage;
private Image selectionImage;
private int alignment;
private int verticalAlignment;
private Color textColorSelected;
private Color textColor;
private String tooltipText;
private GC gc;
private int toolbarHeight;
private boolean isLast;
/**
* Constructs a new instance of this class given its parent (which must be a
* <code>ToolBar</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)
*
* @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 Widget#getStyle
*/
public RoundedToolItem(final RoundedToolbar parent) {
this(parent, SWT.NONE);
}
/**
* Constructs a new instance of this class given its parent (which must be a
* <code>ToolBar</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 Widget#getStyle
*/
public RoundedToolItem(final RoundedToolbar parent, final int style) {
super(parent, style);
parent.addItem(this);
parentToolbar = parent;
textColor = parent.getDisplay().getSystemColor(SWT.COLOR_BLACK);
textColorSelected = parent.getDisplay().getSystemColor(SWT.COLOR_WHITE);
enabled = true;
alignment = SWT.CENTER;
verticalAlignment = SWT.CENTER;
selectionListeners = new CopyOnWriteArrayList<SelectionListener>();
width = -1;
height = -1;
}
/**
* Adds the listener to the collection of listeners who will be notified
* when the control is selected by the user, by sending it one of the
* messages defined in the <code>SelectionListener</code> interface.
* <p>
* <code>widgetDefaultSelected</code> is not called.
* </p>
*
* @param listener the listener which should be notified when the control 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(final SelectionListener listener) {
checkWidget();
if (listener == null) {
SWT.error(SWT.ERROR_NULL_ARGUMENT);
}
selectionListeners.add(listener);
}
/**
* @return the default size of the item
*/
Point computeDefaultSize() {
final Point sizeOfTextAndImages = computeSizeOfTextAndImages();
return new Point(2 * MARGIN + sizeOfTextAndImages.x, 2 * MARGIN + sizeOfTextAndImages.y);
}
private Point computeSizeOfTextAndImages() {
int width = 0, height = 0;
final boolean textNotEmpty = getText() != null && !getText().equals("");
if (textNotEmpty) {
final GC gc = new GC(parentToolbar);
final Point extent = gc.stringExtent(getText());
gc.dispose();
width += extent.x;
height = extent.y;
}
final Point imageSize = new Point(-1, -1);
computeImageSize(getImage(), imageSize);
computeImageSize(selectionImage, imageSize);
computeImageSize(disabledImage, imageSize);
if (imageSize.x != -1) {
width += imageSize.x;
height = Math.max(imageSize.y, height);
if (textNotEmpty) {
width += MARGIN;
}
}
return new Point(width, height);
}
private void computeImageSize(final Image image, final Point imageSize) {
if (image == null) {
return;
}
final Rectangle imageBounds = image.getBounds();
imageSize.x = Math.max(imageBounds.width, imageSize.x);
imageSize.y = Math.max(imageBounds.height, imageSize.y);
}
/**
* @see org.eclipse.swt.widgets.Widget#dispose()
*/
@Override
public void dispose() {
selectionListeners.clear();
getParent().removeItem(this);
bounds = null;
disabledImage = null;
selectionImage = null;
textColor = null;
textColorSelected = null;
super.dispose();
}
void drawButton(final GC gc, final int x, final int toolbarHeight, final boolean isLast) {
this.gc = gc;
this.toolbarHeight = toolbarHeight;
this.isLast = isLast;
if (selection) {
drawBackground(x);
}
if (!isLast) {
drawRightLine(x);
}
int xPosition = computeHorizontalPosition(x);
xPosition += drawImage(x + xPosition);
drawText(x + xPosition);
bounds = new Rectangle(x, 0, getWidth(), toolbarHeight);
}
private void drawBackground(final int x) {
final AdvancedPath path = new AdvancedPath(getDisplay());
final boolean isFirst = getParent().indexOf(this) == 0;
if (isFirst) {
path.addRoundRectangleStraightRight(x, 0, getWidth(), toolbarHeight, parentToolbar.getCornerRadius(), parentToolbar.getCornerRadius());
} else if (isLast) {
path.addRoundRectangleStraightLeft(x, 0, getWidth(), toolbarHeight, parentToolbar.getCornerRadius(), parentToolbar.getCornerRadius());
} else {
path.addRectangle(x, 0, getWidth(), toolbarHeight);
}
gc.setClipping(path);
gc.setForeground(START_GRADIENT_COLOR);
gc.setBackground(END_GRADIENT_COLOR);
gc.fillGradientRectangle(x, 0, getWidth() + parentToolbar.getCornerRadius(), toolbarHeight, true);
gc.setClipping((Rectangle) null);
}
private void drawRightLine(final int x) {
gc.setForeground(RoundedToolbar.BORDER_COLOR);
gc.drawLine(x + getWidth(), 0, x + getWidth(), toolbarHeight);
}
private int computeHorizontalPosition(final int x) {
final int widthOfTextAndImage = computeSizeOfTextAndImages().x;
switch (alignment) {
case SWT.CENTER:
return (getWidth() - widthOfTextAndImage) / 2;
case SWT.RIGHT:
return getWidth() - widthOfTextAndImage - MARGIN;
default:
return MARGIN;
}
}
private int computeVerticalPosition(final int height) {
switch (verticalAlignment) {
case SWT.CENTER:
return (toolbarHeight - height) / 2;
case SWT.TOP:
return MARGIN;
default:
return toolbarHeight - height - MARGIN;
}
}
void fireSelectionEvent() {
final Event event = new Event();
event.widget = parentToolbar;
event.display = getDisplay();
event.item = this;
event.type = SWT.Selection;
for (final SelectionListener selectionListener : selectionListeners) {
selectionListener.widgetSelected(new SelectionEvent(event));
}
}
private int drawImage(final int xPosition) {
Image image;
if (!isEnabled()) {
image = disabledImage;
} else if (selection) {
image = selectionImage;
} else {
image = getImage();
}
if (image == null) {
return 0;
}
final int yPosition = computeVerticalPosition(image.getBounds().height);
gc.drawImage(image, xPosition, yPosition);
return image.getBounds().width + MARGIN;
}
private void drawText(final int xPosition) {
gc.setFont(parentToolbar.getFont());
if (selection) {
gc.setForeground(textColorSelected);
} else {
gc.setForeground(textColor);
}
final Point textSize = gc.stringExtent(getText());
final int yPosition = computeVerticalPosition(textSize.y);
gc.drawText(getText(), xPosition, yPosition, true);
}
/**
* Returns a value which describes the position of the text in the receiver.
* The value will be one of <code>LEFT</code>, <code>RIGHT</code> or
* <code>CENTER</code>.
*
* @return the alignment
*
* @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 getAlignment() {
checkWidget();
return alignment;
}
/**
* Returns a rectangle describing the receiver's size and location relative
* to its parent (or its display if its parent is null), unless the receiver
* is a shell. In this case, the location is relative to the display.
*
* @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>
*/
public Rectangle getBounds() {
checkWidget();
return bounds;
}
/**
* @return the image displayed when the button is disabled
*
* @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 Image getDisabledImage() {
checkWidget();
return disabledImage;
}
/**
* Returns <code>true</code> if the receiver is enabled, and
* <code>false</code> otherwise. A disabled control 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 enabled;
}
/**
* Returns the whole height of the widget.
*
* @return the receiver's height
*
* @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 getHeight() {
checkWidget();
if (height == -1) {
return computeDefaultSize().y;
}
return height;
}
/**
* Returns the receiver's parent, which must be a
* <code>RoundedToolBar</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 RoundedToolbar getParent() {
checkWidget();
return parentToolbar;
}
/**
* Returns <code>true</code> if the receiver is selected, and false
* otherwise.
*
* @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();
return selection;
}
/**
* @return the image displayed when the button is selected
*
* @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 Image getSelectionImage() {
checkWidget();
return selectionImage;
}
/**
* Returns the color of the text when the button is enabled and not
* selected.
*
* @return the receiver's text color
*
* @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 Color getTextColor() {
checkWidget();
return textColor;
}
/**
* Returns the color of the text when the button is not selected.
*
* @return the receiver's text color
*
* @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 Color getTextColorSelected() {
checkWidget();
return textColorSelected;
}
/**
* 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;
}
/**
* Returns a value which describes the position of the text in the receiver.
* The value will be one of <code>TOP</code>, <code>BOTTOM</code> or
* <code>CENTER</code>.
*
* @return the alignment
*
* @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 getVerticalAlignment() {
checkWidget();
return verticalAlignment;
}
/**
* Returns the whole height of the widget.
*
* @return the receiver's height
*
* @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 getWidth() {
checkWidget();
if (width == -1) {
return computeDefaultSize().x;
}
return width;
}
/**
* Returns <code>true</code> if the receiver is enabled, and
* <code>false</code> otherwise. A disabled control 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();
return enabled;
}
/**
* 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(final SelectionListener listener) {
checkWidget();
if (listener == null) {
SWT.error(SWT.ERROR_NULL_ARGUMENT);
}
selectionListeners.remove(listener);
}
/**
* Controls how text will be displayed in the receiver. The argument should
* be one of <code>LEFT</code>, <code>RIGHT</code> or <code>CENTER</code>.
*
* @param alignment the new alignment
*
* @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 setAlignment(final int alignment) {
checkWidget();
this.alignment = alignment;
}
/**
* Sets the receiver's size and location to the rectangular area specified
* by the argument. The <code>x</code> and <code>y</code> fields of the
* rectangle are relative to the receiver's parent (or its display if its
* parent is null).
* <p>
* Note: Attempting to set the width or height of the receiver to a negative
* number will cause that value to be set to zero instead.
* </p>
*
* @param rect the new bounds 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 setBounds(final Rectangle rectangle) {
checkWidget();
if (bounds == null) {
SWT.error(SWT.ERROR_NULL_ARGUMENT);
}
bounds = new Rectangle(Math.max(0, rectangle.x), //
Math.max(0, rectangle.y), //
Math.max(0, rectangle.width), //
Math.max(0, rectangle.height));
}
/**
* Sets the receiver's image to the argument when this is one is disabled,
* which may be null indicating that no image should be displayed.
*
* @param image the image to display on the receiver (may be null)
*
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_INVALID_ARGUMENT - if the image 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 setDisabledImage(final Image image) {
checkWidget();
disabledImage = image;
}
/**
* Enables the receiver if the argument is <code>true</code>, and disables
* it otherwise.
* <p>
* A disabled control is typically not selectable from the user interface
* and draws with an inactive or "grayed" look.
* </p>
*
* @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(final boolean enabled) {
checkWidget();
this.enabled = enabled;
}
/**
* Sets the height of the receiver.
* <p>
* Note: Attempting to set the width or height of the receiver to a negative
* number will cause that value to be set to zero instead.
* </p>
* @param height the new width
*
* @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 setHeight(final int height) {
checkWidget();
this.height = Math.max(height, 0);
}
/**
* Sets the selection state of the receiver.
*
* @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(final boolean selected) {
checkWidget();
selection = selected;
}
/**
* Sets the receiver's image to the argument when this one is selected,
* which may be null indicating that no image should be displayed.
*
* @param image the image to display on the receiver (may be null)
*
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_INVALID_ARGUMENT - if the image 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 setSelectionImage(final Image image) {
checkWidget();
selectionImage = image;
}
/**
* Sets the receiver's text color to the argument, which may be null
* indicating that no image should be displayed.
*
* @param textColor the text color to display on the receiver (may be null)
*
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_INVALID_ARGUMENT - if the image 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 setTextColor(final Color textColor) {
checkWidget();
this.textColor = textColor;
}
/**
* Sets the receiver's text color to the argument when this one is selected,
* which may be null indicating that no image should be displayed.
*
* @param textColor the text color to display on the receiver (may be null)
*
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_INVALID_ARGUMENT - if the image 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 setTextColorSelected(final Color textColor) {
checkWidget();
textColorSelected = textColor;
}
/**
* 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(final String string) {
checkWidget();
tooltipText = string == null ? "" : string;
}
/**
* Controls how text will be displayed in the receiver. The argument should
* be one of <code>TOP</code>, <code>BOTTOM</code> or <code>CENTER</code>.
*
* @param alignment the new alignment
*
* @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 setVerticalAlignment(final int verticalAlignment) {
checkWidget();
this.verticalAlignment = verticalAlignment;
}
/**
* Sets the width of the receiver.
* <p>
* Note: Attempting to set the width or height of the receiver to a negative
* number will cause that value to be set to zero instead.
* </p>
* @param width the new width
*
* @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 setWidth(final int width) {
checkWidget();
this.width = Math.max(0, width);
}
}