/*******************************************************************************
* 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.events.*;
import org.eclipse.swt.graphics.*;
/**
* Instances of this class represent a column in a tree widget.
* <p><dl>
* <dt><b>Styles:</b></dt>
* <dd>LEFT, RIGHT, CENTER</dd>
* <dt><b>Events:</b></dt>
* <dd> Move, Resize, Selection</dd>
* </dl>
* </p><p>
* Note: Only one of the styles LEFT, RIGHT and CENTER 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/snippets/#tree">Tree, TreeItem, TreeColumn snippets</a>
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*
* @since 3.1
* @noextend This class is not intended to be subclassed by clients.
*/
public class TreeColumn extends Item {
Tree parent;
String displayText = "";
int width, itemImageWidth;
boolean moveable, resizable = true;
int sort = SWT.NONE;
String toolTipText;
/**
* Constructs a new instance of this class given its parent
* (which must be a <code>Tree</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#LEFT
* @see SWT#RIGHT
* @see SWT#CENTER
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public TreeColumn (Tree parent, int style) {
this (parent, style, checkNull (parent).columns.length);
}
/**
* Constructs a new instance of this class given its parent
* (which must be a <code>Tree</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>
* <p>
* Note that due to a restriction on some platforms, the first column
* is always left aligned.
* </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#LEFT
* @see SWT#RIGHT
* @see SWT#CENTER
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public TreeColumn (Tree parent, int style, int index) {
super (parent, checkStyle (style), index);
if (!(0 <= index && index <= parent.columns.length)) error (SWT.ERROR_INVALID_RANGE);
this.parent = parent;
parent.createItem (this, index);
}
/**
* Adds the listener to the collection of listeners who will
* be notified when the control is moved or resized, by sending
* it one of the messages defined in the <code>ControlListener</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 ControlListener
* @see #removeControlListener
*/
public void addControlListener (ControlListener listener) {
checkWidget ();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
TypedListener typedListener = new TypedListener (listener);
addListener (SWT.Resize, typedListener);
addListener (SWT.Move, typedListener);
}
/**
* 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>widgetSelected</code> is called when the column header is selected.
* <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 (SelectionListener listener) {
checkWidget ();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
TypedListener typedListener = new TypedListener (listener);
addListener (SWT.Selection, typedListener);
addListener (SWT.DefaultSelection, typedListener);
}
static Tree checkNull (Tree tree) {
if (tree == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
return tree;
}
static int checkStyle (int style) {
return checkBits (style, SWT.LEFT, SWT.CENTER, SWT.RIGHT, 0, 0, 0);
}
protected void checkSubclass () {
if (!isValidSubclass ()) error (SWT.ERROR_INVALID_SUBCLASS);
}
void computeDisplayText (GC gc) {
int availableWidth = width - 2 * parent.getHeaderPadding ();
if (image != null) {
availableWidth -= image.getBounds ().width;
availableWidth -= Tree.MARGIN_IMAGE;
}
if (sort != SWT.NONE) {
availableWidth -= parent.arrowBounds.width;
availableWidth -= Tree.MARGIN_IMAGE;
}
String text = this.text;
int textWidth = gc.textExtent (text, SWT.DRAW_MNEMONIC).x;
if (textWidth <= availableWidth) {
displayText = text;
return;
}
/* Ellipsis will be needed, so subtract their width from the available text width */
int ellipsisWidth = gc.stringExtent (Tree.ELLIPSIS).x;
availableWidth -= ellipsisWidth;
if (availableWidth <= 0) {
displayText = Tree.ELLIPSIS;
return;
}
/* Make initial guess. */
int index = Math.min (availableWidth / gc.getFontMetrics ().getAverageCharWidth (), text.length ());
textWidth = gc.textExtent (text.substring (0, index), SWT.DRAW_MNEMONIC).x;
/* Initial guess is correct. */
if (availableWidth == textWidth) {
displayText = text.substring (0, index) + Tree.ELLIPSIS;
return;
}
/* Initial guess is too high, so reduce until fit is found. */
if (availableWidth < textWidth) {
do {
index--;
if (index < 0) {
displayText = Tree.ELLIPSIS;
return;
}
text = text.substring (0, index);
textWidth = gc.textExtent (text, SWT.DRAW_MNEMONIC).x;
} while (availableWidth < textWidth);
displayText = text + Tree.ELLIPSIS;
return;
}
/* Initial guess is too low, so increase until overrun is found. */
while (textWidth < availableWidth) {
index++;
textWidth = gc.textExtent (text.substring (0, index), SWT.DRAW_MNEMONIC).x;
}
displayText = text.substring (0, index - 1) + Tree.ELLIPSIS;
}
public void dispose () {
if (isDisposed ()) return;
Rectangle parentBounds = parent.clientArea;
int x = getX ();
Tree parent = this.parent;
dispose (true);
int width = parentBounds.width - x;
parent.redraw (x, 0, width, parentBounds.height, false);
if (parent.drawCount <= 0 && parent.getHeaderVisible ()) {
parent.header.redraw (x, 0, width, parent.getHeaderHeight (), false);
}
}
void dispose (boolean notifyParent) {
super.dispose (); /* super is intentional here */
if (notifyParent) parent.destroyItem (this);
parent = null;
}
/**
* Returns a value which describes the position of the
* text or image 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 ();
if ((style & SWT.CENTER) != 0) return SWT.CENTER;
if ((style & SWT.RIGHT) != 0) return SWT.RIGHT;
return SWT.LEFT;
}
/*
* Returns the width of the header's content
* (image + text + sort arrow + internal margins)
*/
int getContentWidth (GC gc, boolean useDisplayText) {
int contentWidth = 0;
String text = useDisplayText ? displayText : this.text;
if (text.length () > 0) {
contentWidth += gc.textExtent (text, SWT.DRAW_MNEMONIC).x;
}
if (image != null) {
contentWidth += image.getBounds ().width;
if (text.length () > 0) contentWidth += Tree.MARGIN_IMAGE;
}
if (sort != SWT.NONE) {
contentWidth += parent.arrowBounds.width;
if (text.length () > 0 || image != null) {
contentWidth += Tree.MARGIN_IMAGE;
}
}
return contentWidth;
}
int getIndex () {
TreeColumn[] columns = parent.columns;
for (int i = 0; i < columns.length; i++) {
if (columns [i] == this) return i;
}
return -1;
}
/**
* Gets the moveable attribute. A column that is
* not moveable cannot be reordered by the user
* by dragging the header but may be reordered
* by the programmer.
*
* @return the moveable attribute
*
* @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 Tree#getColumnOrder()
* @see Tree#setColumnOrder(int[])
* @see TreeColumn#setMoveable(boolean)
* @see SWT#Move
*
* @since 3.2
*/
public boolean getMoveable () {
checkWidget ();
return moveable;
}
int getOrderIndex () {
TreeColumn[] orderedColumns = parent.orderedColumns;
if (orderedColumns == null) return getIndex ();
for (int i = 0; i < orderedColumns.length; i++) {
if (orderedColumns [i] == this) return i;
}
return -1;
}
/**
* Returns the receiver's parent, which must be a <code>Tree</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 Tree getParent () {
checkWidget ();
return parent;
}
int getPreferredWidth () {
if (!parent.getHeaderVisible ()) return 0;
GC gc = new GC (parent);
int result = getContentWidth (gc, false);
gc.dispose ();
return result + 2 * parent.getHeaderPadding ();
}
/**
* Gets the resizable attribute. A column that is
* not resizable cannot be dragged by the user but
* may be resized by the programmer.
*
* @return the resizable attribute
*
* @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 getResizable () {
checkWidget ();
return resizable;
}
/**
* 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>
*
* @since 3.2
*/
public String getToolTipText () {
checkWidget ();
return toolTipText;
}
/**
* Gets the width of the receiver.
*
* @return the 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 int getWidth () {
checkWidget ();
return width;
}
int getX () {
TreeColumn[] orderedColumns = parent.getOrderedColumns ();
int index = getOrderIndex ();
int result = -parent.horizontalOffset;
for (int i = 0; i < index; i++) {
result += orderedColumns [i].width;
}
return result;
}
void paint (GC gc) {
int padding = parent.getHeaderPadding ();
int x = getX ();
int startX = x + padding;
if (getOrderIndex () != 0 && (style & SWT.LEFT) == 0) {
int contentWidth = getContentWidth (gc, true);
if ((style & SWT.RIGHT) != 0) {
startX = Math.max (startX, x + width - padding - contentWidth);
} else { /* SWT.CENTER */
startX = Math.max (startX, x + (width - contentWidth) / 2);
}
}
int headerHeight = parent.getHeaderHeight ();
/* restrict the clipping region to the header cell */
gc.setClipping (
x + padding,
padding,
width - 2 * padding,
headerHeight - 2 * padding);
if (image != null) {
Rectangle imageBounds = image.getBounds ();
int drawHeight = Math.min (imageBounds.height, headerHeight - 2 * padding);
gc.drawImage (
image,
0, 0,
imageBounds.width, imageBounds.height,
startX, (headerHeight - drawHeight) / 2,
imageBounds.width, drawHeight);
startX += imageBounds.width;
startX += Tree.MARGIN_IMAGE;
}
if (displayText.length () > 0) {
gc.setForeground (display.getSystemColor (SWT.COLOR_BLACK));
int fontHeight = parent.fontHeight;
gc.drawText (displayText, startX, (headerHeight - fontHeight) / 2, SWT.DRAW_MNEMONIC);
startX += gc.textExtent (displayText, SWT.DRAW_MNEMONIC).x + Tree.MARGIN_IMAGE;
}
if (sort != SWT.NONE) {
Image image = sort == SWT.DOWN ? parent.getArrowDownImage () : parent.getArrowUpImage ();
int y = (headerHeight - parent.arrowBounds.height) / 2;
gc.drawImage (image, startX, y);
}
}
/**
* Causes the receiver to be resized to its preferred size.
* For a composite, this involves computing the preferred size
* from its layout, if there is one.
*
* @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 pack () {
checkWidget ();
TreeItem[] availableItems = parent.availableItems;
int index = getIndex ();
int newWidth = getPreferredWidth ();
for (int i = 0; i < parent.availableItemsCount; i++) {
int width = availableItems [i].getPreferredWidth (index);
/* ensure that receiver and parent were not disposed in a callback */
if (parent.isDisposed () || isDisposed ()) return;
if (!availableItems [i].isDisposed ()) {
newWidth = Math.max (newWidth, width);
}
}
if (newWidth != width) parent.updateColumnWidth (this, newWidth);
}
/**
* Removes the listener from the collection of listeners who will
* be notified when the control is moved or resized.
*
* @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 ControlListener
* @see #addControlListener
*/
public void removeControlListener (ControlListener listener) {
checkWidget ();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
if (eventTable == null) return;
eventTable.unhook (SWT.Move, listener);
eventTable.unhook (SWT.Resize, listener);
}
/**
* 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);
removeListener (SWT.Selection, listener);
removeListener (SWT.DefaultSelection, listener);
}
/**
* Controls how text and images will be displayed in the receiver.
* The argument should be one of <code>LEFT</code>, <code>RIGHT</code>
* or <code>CENTER</code>.
* <p>
* Note that due to a restriction on some platforms, the first column
* is always left aligned.
* </p>
* @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 (int alignment) {
checkWidget ();
if ((alignment & (SWT.LEFT | SWT.RIGHT | SWT.CENTER)) == 0) return;
alignment = checkBits (alignment, SWT.LEFT, SWT.CENTER, SWT.RIGHT, 0, 0, 0);
if ((style & alignment) != 0) return; /* same value */
style &= ~(SWT.LEFT | SWT.CENTER | SWT.RIGHT);
style |= alignment;
if (getOrderIndex () == 0) return; /* no update needed since first ordered column appears left-aligned */
int x = getX ();
parent.redraw (x, 0, width, parent.clientArea.height, false);
if (parent.drawCount <= 0 && parent.getHeaderVisible ()) {
/* don't damage the header's drawn borders */
parent.header.redraw (x, 1, width - 2, parent.getHeaderHeight () - 3, false);
}
}
public void setImage (Image value) {
checkWidget ();
if (value == image) return;
if (value != null && value.equals (image)) return; /* same value */
super.setImage (value);
/* An image width change may affect the space available for the column's displayText. */
GC gc = new GC (parent);
computeDisplayText (gc);
gc.dispose ();
/*
* If this is the first image being put into the header then the header
* height may be adjusted, in which case a full redraw is needed.
*/
if (parent.headerImageHeight == 0) {
int oldHeaderHeight = parent.getHeaderHeight ();
parent.setHeaderImageHeight (value.getBounds ().height);
if (oldHeaderHeight != parent.getHeaderHeight ()) {
/* parent header height changed */
if (parent.drawCount <= 0 && parent.getHeaderVisible ()) {
parent.header.redraw ();
}
parent.redraw ();
return;
}
}
if (parent.drawCount <= 0 && parent.getHeaderVisible ()) {
/* don't damage the header's drawn borders */
parent.header.redraw (getX (), 1, width - 2, parent.getHeaderHeight () - 3, false);
}
}
/**
* Sets the moveable attribute. A column that is
* moveable can be reordered by the user by dragging
* the header. A column that is not moveable cannot be
* dragged by the user but may be reordered
* by the programmer.
*
* @param moveable the moveable attribute
*
* @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 Tree#setColumnOrder(int[])
* @see Tree#getColumnOrder()
* @see TreeColumn#getMoveable()
* @see SWT#Move
*
* @since 3.2
*/
public void setMoveable (boolean moveable) {
checkWidget ();
this.moveable = moveable;
}
/**
* Sets the resizable attribute. A column that is
* not resizable cannot be dragged by the user but
* may be resized by the programmer.
*
* @param resizable the resize attribute
*
* @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 setResizable (boolean value) {
checkWidget ();
resizable = value;
}
void setSortDirection (int value) {
if (value == sort) return;
boolean widthChange = value == SWT.NONE || sort == SWT.NONE;
sort = value;
if (widthChange) {
/*
* adding/removing the sort arrow decreases/increases the width that is
* available for the column's header text, so recompute the display text
*/
GC gc = new GC (parent);
computeDisplayText (gc);
gc.dispose ();
}
if (parent.drawCount <= 0 && parent.getHeaderVisible ()) {
/* don't damage the header's drawn borders */
parent.header.redraw (getX (), 1, width - 2, parent.getHeaderHeight () - 3, false);
}
}
public void setText (String value) {
checkWidget ();
if (value == null) error (SWT.ERROR_NULL_ARGUMENT);
if (value.equals (text)) return; /* same value */
super.setText (value);
GC gc = new GC (parent);
computeDisplayText (gc);
gc.dispose ();
if (parent.drawCount <= 0 && parent.getHeaderVisible ()) {
/* don't damage the header's drawn borders */
parent.header.redraw (getX (), 1, width - 2, parent.getHeaderHeight () - 3, false);
}
}
/**
* 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>
*
* @since 3.2
*/
public void setToolTipText (String string) {
checkWidget ();
if (toolTipText == string) return;
if (toolTipText != null && toolTipText.equals (string)) return;
toolTipText = string;
if (parent.toolTipShell == null) return; /* tooltip not currently showing */
if (((Integer) parent.toolTipShell.getData ()).intValue () != getIndex ()) return; /* tooltip showing for different column */
parent.headerUpdateToolTip (getX () + (width / 2)); /* update the tooltip text */
}
/**
* Sets the width of the receiver.
*
* @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 (int value) {
checkWidget ();
if (value < 0) return;
if (width == value) return; /* same value */
parent.updateColumnWidth (this, value);
}
/*
* Perform any internal changes necessary to reflect a changed width.
*/
void updateWidth (GC gc) {
String oldDisplayText = displayText;
computeDisplayText (gc);
/* the header must be damaged if the display text has changed or if the alignment is not LEFT */
if (parent.getHeaderVisible ()) {
if ((style & SWT.LEFT) == 0 || !oldDisplayText.equals (displayText)) {
int padding = parent.getHeaderPadding ();
parent.header.redraw (getX () + padding, 0, width - padding, parent.getHeaderHeight (), false);
}
}
}
void updateFont (GC gc) {
computeDisplayText (gc);
}
}