org.eclipse.swt.widgets.Link Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of org.eclipse.swt.gtk.linux.ppc64le Show documentation
Standard Widget Toolkit for GTK on ppc64le
The newest version!
/*******************************************************************************
 * Copyright (c) 2000, 2018 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Conrad Groth - Bug 401015 - [CSS] Add support for styling hyperlinks in Links
 *******************************************************************************/
package org.eclipse.swt.widgets;

import org.eclipse.swt.*;
import org.eclipse.swt.accessibility.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.internal.gtk3.*;
import org.eclipse.swt.internal.gtk4.*;

/**
 * Instances of this class represent a selectable
 * user interface object that displays a text with
 * links.
 * 
 * Styles:
 * (none)
 * Events:
 * Selection
 * 
 * 
 * IMPORTANT: This class is not intended to be subclassed.
 * 
 *
 * @see Link snippets
 * @see SWT Example: ControlExample
 * @see Sample code and further information
 *
 * @since 3.1
 * @noextend This class is not intended to be subclassed by clients.
 */
public class Link extends Control {
	String text;
	TextLayout layout;
	Color linkColor, disabledColor;
	Point [] offsets;
	Point selection;
	String [] ids;
	int [] mnemonics;

	/**
	 * Index of the currently focused link in the text.
	 * Equals -1, if the text has not been set through setText
	 */
	int focusIndex;

	static final RGB LINK_DISABLED_FOREGROUND = new RGB (172, 168, 153);

/**
 * Constructs a new instance of this class given its parent
 * and a style value describing its behavior and appearance.
 * 
 * The style value is either one of the style constants defined in
 * class SWT which is applicable to instances of this
 * class, or must be built by bitwise OR'ing together
 * (that is, using the int "|" operator) two or more
 * of those SWT style constants. The class description
 * lists the style constants that are applicable to the class.
 * Style bits are also inherited from superclasses.
 * 
 *
 * @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 
 *    ERROR_NULL_ARGUMENT - if the parent is null
 * 
 * @exception SWTException 
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
 *    ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
 * 
 *
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public Link (Composite parent, int style) {
	super (parent, style);
}

/**
 * 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 SelectionListener
 * interface.
 * 
 * widgetSelected is called when the control is selected by the user.
 * widgetDefaultSelected is not called.
 * 
 *
 * @param listener the listener which should be notified
 *
 * @exception IllegalArgumentException 
 *    ERROR_NULL_ARGUMENT - if the listener is null
 * 
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 *
 * @see SelectionListener
 * @see #removeSelectionListener
 * @see SelectionEvent
 */
public void addSelectionListener (SelectionListener listener) {
	addTypedListener(listener, SWT.Selection, SWT.DefaultSelection);
}

@Override
Point computeSizeInPixels (int wHint, int hHint, boolean changed) {
	checkWidget ();
	if (wHint != SWT.DEFAULT && wHint < 0) wHint = 0;
	if (hHint != SWT.DEFAULT && hHint < 0) hHint = 0;
	int width, height;
	int layoutWidth = layout.getWidth ();
	//TEMPORARY CODE
	if (wHint == 0) {
		layout.setWidth (1);
		Rectangle rect = DPIUtil.autoScaleUp(layout.getBounds ());
		width = 0;
		height = rect.height;
	} else {
		layout.setWidth (DPIUtil.autoScaleDown(wHint));
		Rectangle rect = DPIUtil.autoScaleUp(layout.getBounds ());
		width = rect.width;
		height = rect.height;
	}
	layout.setWidth (layoutWidth);
	if (wHint != SWT.DEFAULT) width = wHint;
	if (hHint != SWT.DEFAULT) height = hHint;
	int border = getBorderWidthInPixels ();
	width += border * 2;
	height += border * 2;
	return new Point (width, height);
}

@Override
void createHandle(int index) {
	state |= HANDLE | THEME_BACKGROUND;

	handle = OS.g_object_new(display.gtk_fixed_get_type(), 0);
	if (handle == 0) error(SWT.ERROR_NO_HANDLES);
	if (GTK.GTK4) {
		GTK4.gtk_widget_set_focusable(handle, true);
	} else {
		GTK3.gtk_widget_set_has_window(handle, true);
	}
	GTK.gtk_widget_set_can_focus(handle, true);

	layout = new TextLayout (display);
	disabledColor = new Color (LINK_DISABLED_FOREGROUND);
	offsets = new Point [0];
	ids = new String [0];
	mnemonics = new int [0];
	selection = new Point (-1, -1);
	focusIndex = -1;
}

@Override
void createWidget (int index) {
	super.createWidget (index);
	layout.setFont (getFont ());
	text = "";
	initAccessible ();
}

@Override
void drawWidget(GC gc) {
	int selStart = selection.x;
	int selEnd = selection.y;
	if (selStart > selEnd) {
		selStart = selection.y;
		selEnd = selection.x;
	}
	// temporary code to disable text selection
	selStart = selEnd = -1;
	if ((state & DISABLED) != 0) gc.setForeground (disabledColor);
	layout.draw (gc, 0, 0, selStart, selEnd, null, null);
	if (hasFocus () && focusIndex != -1) {
		Rectangle [] rects = getRectanglesInPixels (focusIndex);
		for (int i = 0; i < rects.length; i++) {
			Rectangle rect = DPIUtil.autoScaleDown(rects [i]);
			gc.drawFocus (rect.x, rect.y, rect.width, rect.height);
		}
	}
}

@Override
void enableWidget (boolean enabled) {
	super.enableWidget (enabled);
	if (isDisposed ()) return;
	styleLinkParts();
	redraw ();
}

@Override
void fixStyle () {
	fixStyle (handle);
}

void initAccessible () {
	if (GTK.GTK4) return;

	Accessible accessible = getAccessible ();
	accessible.addAccessibleListener (new AccessibleAdapter () {
		@Override
		public void getName (AccessibleEvent e) {
			e.result = parse (text);
		}
	});

	accessible.addAccessibleControlListener (new AccessibleControlAdapter () {
		@Override
		public void getChildAtPoint (AccessibleControlEvent e) {
			e.childID = ACC.CHILDID_SELF;
		}

		@Override
		public void getLocation (AccessibleControlEvent e) {
			Rectangle rect = display.map (getParent (), null, getBounds ());
			e.x = rect.x;
			e.y = rect.y;
			e.width = rect.width;
			e.height = rect.height;
		}

		@Override
		public void getChildCount (AccessibleControlEvent e) {
			e.detail = 0;
		}

		@Override
		public void getRole (AccessibleControlEvent e) {
			e.detail = ACC.ROLE_LINK;
		}

		@Override
		public void getState (AccessibleControlEvent e) {
			e.detail = ACC.STATE_FOCUSABLE;
			if (hasFocus ()) e.detail |= ACC.STATE_FOCUSED;
		}

		@Override
		public void getDefaultAction (AccessibleControlEvent e) {
			e.result = SWT.getMessage ("SWT_Press"); //$NON-NLS-1$
		}

		@Override
		public void getSelection (AccessibleControlEvent e) {
			if (hasFocus ()) e.childID = ACC.CHILDID_SELF;
		}

		@Override
		public void getFocus (AccessibleControlEvent e) {
			if (hasFocus ()) e.childID = ACC.CHILDID_SELF;
		}
	});
}

/**
 * Returns the link foreground color.
 *
 * @return the receiver's link foreground color.
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 * @since 3.105
 */
public Color getLinkForeground () {
	checkWidget ();
	return linkColor != null ? linkColor : display.getSystemColor(SWT.COLOR_LINK_FOREGROUND);
}

@Override
String getNameText () {
	return getText ();
}

Rectangle [] getRectanglesInPixels (int linkIndex) {
	int lineCount = layout.getLineCount ();
	Rectangle [] rects = new Rectangle [lineCount];
	int [] lineOffsets = layout.getLineOffsets ();
	Point point = offsets [linkIndex];
	int lineStart = 1;
	while (point.x > lineOffsets [lineStart]) lineStart++;
	int lineEnd = 1;
	while (point.y > lineOffsets [lineEnd]) lineEnd++;
	int index = 0;
	if (lineStart == lineEnd) {
		rects [index++] = DPIUtil.autoScaleUp (layout.getBounds (point.x, point.y));
	} else {
		rects [index++] = DPIUtil.autoScaleUp (layout.getBounds (point.x, lineOffsets [lineStart]-1));
		rects [index++] = DPIUtil.autoScaleUp (layout.getBounds (lineOffsets [lineEnd-1], point.y));
		if (lineEnd - lineStart > 1) {
			for (int i = lineStart; i < lineEnd - 1; i++) {
				rects [index++] = DPIUtil.autoScaleUp (layout.getLineBounds (i));
			}
		}
	}
	if (rects.length != index) {
		Rectangle [] tmp = new Rectangle [index];
		System.arraycopy (rects, 0, tmp, 0, index);
		rects = tmp;
	}
	return rects;
}

/**
 * Returns the receiver's text, which will be an empty
 * string if it has never been set.
 *
 * @return the receiver's text
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
public String getText () {
	checkWidget ();
	return text;
}

@Override
long gtk_button_press_event (long widget, long event) {
	long result = super.gtk_button_press_event (widget, event);
	if (result != 0) return result;

	int eventType = GDK.gdk_event_get_event_type(event);
	eventType = fixGdkEventTypeValues(eventType);

	int [] eventButton = new int [1];
	if (GTK.GTK4) {
		eventButton[0] = GDK.gdk_button_event_get_button(event);
	} else {
		GDK.gdk_event_get_button(event, eventButton);
	}

	double [] eventX = new double [1];
	double [] eventY = new double [1];
	if (GTK.GTK4) {
		GDK.gdk_event_get_position(event, eventX, eventY);
	} else {
		GDK.gdk_event_get_coords(event, eventX, eventY);
	}

	if (eventButton[0] == 1 && eventType == GDK.GDK_BUTTON_PRESS) {
		if (focusIndex != -1) setFocus ();
		int x = (int) eventX[0];
		int y = (int) eventY[0];
		if ((style & SWT.MIRRORED) != 0) x = getClientWidth () - x;
		int offset = DPIUtil.autoScaleUp(layout.getOffset (x, y, null));
		int oldSelectionX = selection.x;
		int oldSelectionY = selection.y;
		selection.x = offset;
		selection.y = -1;
		if (oldSelectionX != -1 && oldSelectionY != -1) {
			if (oldSelectionX > oldSelectionY) {
				int temp = oldSelectionX;
				oldSelectionX = oldSelectionY;
				oldSelectionY = temp;
			}
			Rectangle rect = DPIUtil.autoScaleUp(layout.getBounds (oldSelectionX, oldSelectionY));
			redrawInPixels (rect.x, rect.y, rect.width, rect.height, false);
		}
		for (int j = 0; j < offsets.length; j++) {
			Rectangle [] rects = getRectanglesInPixels (j);
			for (int i = 0; i < rects.length; i++) {
				Rectangle rect = rects [i];
				if (rect.contains (x, y)) {
					focusIndex = j;
					redraw ();
					return result;
				}
			}
		}
	}
	return result;
}

@Override
long gtk_button_release_event (long widget, long event) {
	long result = super.gtk_button_release_event (widget, event);
	if (result != 0) return result;
	if (focusIndex == -1) return result;

	int [] eventButton = new int [1];
	if (GTK.GTK4) {
		eventButton[0] = GDK.gdk_button_event_get_button(event);
	} else {
		GDK.gdk_event_get_button(event, eventButton);
	}

	double [] eventX = new double [1];
	double [] eventY = new double [1];
	if (GTK.GTK4) {
		GDK.gdk_event_get_position(event, eventX, eventY);
	} else {
		GDK.gdk_event_get_coords(event, eventX, eventY);
	}

	if (eventButton[0] == 1) {
		int x = (int) eventX[0];
		int y = (int) eventY[0];
		if ((style & SWT.MIRRORED) != 0) x = getClientWidth () - x;
		Rectangle [] rects = getRectanglesInPixels (focusIndex);
		for (int i = 0; i < rects.length; i++) {
			Rectangle rect = rects [i];
			if (rect.contains (x, y)) {
				Event ev = new Event ();
				ev.text = ids [focusIndex];
				sendSelectionEvent (SWT.Selection, ev, true);
				return result;
			}
		}
	}
	return result;
}

@Override
long gtk_draw (long widget, long cairo) {
	long context = GTK.gtk_widget_get_style_context(widget);
	GtkAllocation allocation = new GtkAllocation();
	GTK.gtk_widget_get_allocation (widget, allocation);
	int width = (state & ZERO_WIDTH) != 0 ? 0 : allocation.width;
	int height = (state & ZERO_HEIGHT) != 0 ? 0 : allocation.height;
	// We specify a 0 value for x & y as we want the whole widget to be
	// colored, not some portion of it.
	GTK.gtk_render_background(context, cairo, 0, 0, width, height);
	return super.gtk_draw(widget, cairo);
}

@Override
long gtk_event_after (long widget, long gdkEvent) {
	long result = super.gtk_event_after (widget, gdkEvent);
	int eventType = GDK.gdk_event_get_event_type(gdkEvent);
	switch (eventType) {
		case GDK.GDK_FOCUS_CHANGE:
			redraw ();
			break;
	}
	return result;
}

@Override
boolean gtk4_key_press_event(long controller, int keyval, int keycode, int state, long event) {
	boolean handled = super.gtk4_key_press_event(controller, keyval, keycode, state, event);
	if (!handled && focusIndex != -1) {
		switch (keyval) {
			case GDK.GDK_Return:
			case GDK.GDK_KP_Enter:
			case GDK.GDK_space:
				Event jEvent = new Event();
				jEvent.text = ids[focusIndex];
				sendSelectionEvent(SWT.Selection, jEvent, true);
				break;
			case GDK.GDK_Tab:
				if (focusIndex < offsets.length - 1) {
					focusIndex++;
					redraw();
				}
				break;
			case GDK.GDK_ISO_Left_Tab:
				if (focusIndex > 0) {
					focusIndex--;
					redraw();
				}
				break;
		}
	}

	return handled;
}

@Override
long gtk_key_press_event (long widget, long eventPtr) {
	long result = super.gtk_key_press_event (widget, eventPtr);
	if (result != 0) return result;
	if (focusIndex == -1) return result;

	int [] key = new int [1];
	GDK.gdk_event_get_keyval(eventPtr, key);

	switch (key[0]) {
		case GDK.GDK_Return:
		case GDK.GDK_KP_Enter:
		case GDK.GDK_space:
			Event event = new Event ();
			event.text = ids [focusIndex];
			sendSelectionEvent (SWT.Selection, event, true);
			break;
		case GDK.GDK_Tab:
			if (focusIndex < offsets.length - 1) {
				focusIndex++;
				redraw ();
			}
			break;
		case GDK.GDK_ISO_Left_Tab:
			if (focusIndex > 0) {
				focusIndex--;
				redraw ();
			}
			break;
	}
	return result;
}

@Override
long gtk_motion_notify_event (long widget, long event) {
	long result = super.gtk_motion_notify_event (widget, event);
	if (result != 0) return result;

	double [] eventX = new double [1];
	double [] eventY = new double [1];

	int [] state = new int [1];
	if (GTK.GTK4) {
		GDK.gdk_event_get_position(event, eventX, eventY);
		state[0] = GDK.gdk_event_get_modifier_state(event);
	} else {
		GDK.gdk_event_get_coords(event, eventX, eventY);
		GDK.gdk_event_get_state(event, state);
	}

	int x = (int) eventX[0];
	int y = (int) eventY[0];

	if ((style & SWT.MIRRORED) != 0) x = getClientWidth () - x;
	if ((state[0] & GDK.GDK_BUTTON1_MASK) != 0) {
		int oldSelection = selection.y;
		selection.y = DPIUtil.autoScaleUp(layout.getOffset (x, y, null));
		if (selection.y != oldSelection) {
			int newSelection = selection.y;
			if (oldSelection > newSelection) {
				int temp = oldSelection;
				oldSelection = newSelection;
				newSelection = temp;
			}
			Rectangle rect = layout.getBounds (oldSelection, newSelection);
			redrawInPixels (rect.x, rect.y, rect.width, rect.height, false);
		}
	} else {
		for (int j = 0; j < offsets.length; j++) {
			Rectangle [] rects = getRectanglesInPixels (j);
			for (int i = 0; i < rects.length; i++) {
				Rectangle rect = rects [i];
				if (rect.contains (x, y)) {
					setCursor (display.getSystemCursor (SWT.CURSOR_HAND));
					return result;
				}
			}
		}
		setCursor (null);
	}
	return result;
}

@Override
boolean hooksPaint () {
	return true;
}

@Override
boolean mnemonicHit (char key) {
	char uckey = Character.toUpperCase (key);
	String parsedText = layout.getText();
	for (int i = 0; i < mnemonics.length - 1; i++) {
		if (mnemonics[i] != -1) {
			char mnemonic = parsedText.charAt(mnemonics[i]);
			if (uckey == Character.toUpperCase (mnemonic)) {
				if (!setFocus ()) return false;
				focusIndex = i;
				redraw ();
				return  true;
			}
		}
	}
	return false;
}

@Override
boolean mnemonicMatch (char key) {
	char uckey = Character.toUpperCase (key);
	String parsedText = layout.getText();
	for (int i = 0; i < mnemonics.length - 1; i++) {
		if (mnemonics[i] != -1) {
			char mnemonic = parsedText.charAt(mnemonics[i]);
			if (uckey == Character.toUpperCase (mnemonic)) {
				return true;
			}
		}
	}
	return false;
}


@Override
void releaseWidget () {
	super.releaseWidget ();
	if (layout != null)	layout.dispose ();
	layout = null;
	linkColor = null;
	disabledColor = null;
	offsets = null;
	ids = null;
	mnemonics = null;
	text = null;
}

/**
 * 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 
 *    ERROR_NULL_ARGUMENT - if the listener is null
 * 
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 *
 * @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);
}

String parse (String string) {
	int length = string.length ();
	offsets = new Point [length / 4];
	ids = new String [length / 4];
	mnemonics = new int [length / 4 + 1];
	StringBuilder result = new StringBuilder ();
	StringBuilder buffer = new StringBuilder(string);
	int index = 0, state = 0, linkIndex = 0;
	int start = 0, tagStart = 0, linkStart = 0, endtagStart = 0, refStart = 0;
	while (index < length) {
		char c = Character.toLowerCase (buffer.charAt(index));

		// escape < or > with \\< or \\>
		if (c == '\\' && index + 1 < length) {
			char c2 = Character.toLowerCase(buffer.charAt(index + 1));
			if (c2 == '<' || c2 == '>') {
				buffer.deleteCharAt(index);
				length--;
			}
		}

		switch (state) {
			case 0:
				if (c == '<') {
					tagStart = index;
					state++;
				}
				break;
			case 1:
				if (c == 'a') state++;
				break;
			case 2:
				switch (c) {
					case 'h':
						state = 7;
						break;
					case '>':
						linkStart = index  + 1;
						state++;
						break;
					default:
						if (Character.isWhitespace(c)) break;
						else state = 13;
				}
				break;
			case 3:
				if (c == '<') {
					endtagStart = index;
					state++;
				}
				break;
			case 4:
				state = c == '/' ? state + 1 : 3;
				break;
			case 5:
				state = c == 'a' ? state + 1 : 3;
				break;
			case 6:
				if (c == '>') {
					mnemonics [linkIndex] = parseMnemonics (buffer.toString().toCharArray(), start, tagStart, result);
					int offset = result.length ();
					parseMnemonics (buffer.toString().toCharArray(), linkStart, endtagStart, result);
					offsets [linkIndex] = new Point (offset, result.length () - 1);
					if (ids [linkIndex] == null) {
						ids [linkIndex] = new String (buffer.toString().toCharArray(), linkStart, endtagStart - linkStart);
					}
					linkIndex++;
					start = tagStart = linkStart = endtagStart = refStart = index + 1;
					state = 0;
				} else {
					state = 3;
				}
				break;
			case 7:
				state = c == 'r' ? state + 1 : 0;
				break;
			case 8:
				state = c == 'e' ? state + 1 : 0;
				break;
			case 9:
				state = c == 'f' ? state + 1 : 0;
				break;
			case 10:
				state = c == '=' ? state + 1 : 0;
				break;
			case 11:
				if (c == '"') {
					state++;
					refStart = index + 1;
				} else {
					state = 0;
				}
				break;
			case 12:
				if (c == '"') {
					ids[linkIndex] = new String (buffer.toString().toCharArray(), refStart, index - refStart);
					state = 2;
				}
				break;
			case 13:
				if (Character.isWhitespace (c)) {
					state = 0;
				} else if (c == '='){
					state++;
				}
				break;
			case 14:
				state = c == '"' ? state + 1 : 0;
				break;
			case 15:
				if (c == '"') state = 2;
				break;
			default:
				state = 0;
				break;
		}
		index++;
	}
	if (start < length) {
		int tmp = parseMnemonics (buffer.toString().toCharArray(), start, tagStart, result);
		int mnemonic = parseMnemonics (buffer.toString().toCharArray(), Math.max (tagStart, linkStart), length, result);
		if (mnemonic == -1) mnemonic = tmp;
		mnemonics [linkIndex] = mnemonic;
	} else {
		mnemonics [linkIndex] = -1;
	}
	if (offsets.length != linkIndex) {
		Point [] newOffsets = new Point [linkIndex];
		System.arraycopy (offsets, 0, newOffsets, 0, linkIndex);
		offsets = newOffsets;
		String [] newIDs = new String [linkIndex];
		System.arraycopy (ids, 0, newIDs, 0, linkIndex);
		ids = newIDs;
		int [] newMnemonics = new int [linkIndex + 1];
		System.arraycopy (mnemonics, 0, newMnemonics, 0, linkIndex + 1);
		mnemonics = newMnemonics;
	}
	return result.toString ();
}

int parseMnemonics (char[] buffer, int start, int end, StringBuilder result) {
	int mnemonic = -1, index = start;
	while (index < end) {
		if (buffer [index] == '&') {
			if (index + 1 < end && buffer [index + 1] == '&') {
				result.append (buffer [index]);
				index++;
			} else {
				mnemonic = result.length();
			}
		} else {
			result.append (buffer [index]);
		}
		index++;
	}
	return mnemonic;
}

@Override
int setBounds(int x, int y, int width, int height, boolean move, boolean resize) {
	int result = super.setBounds (x, y, width,height, move, resize);
	if ((result & RESIZED) != 0) {
		layout.setWidth (DPIUtil.autoScaleDown((width > 0 ? width : -1)));
		redraw ();
	}
	return result;
}

@Override
void setFontDescription (long font) {
	super.setFontDescription (font);
	layout.setFont (Font.gtk_new (display, font));
}

/**
 * Sets the link foreground color to the color specified
 * by the argument, or to the default system color for the link
 * if the argument is null.
 * 
 * Note: This operation is a hint and may be overridden by the platform.
 * 
 * @param color the new color (or null)
 *
 * @exception IllegalArgumentException 
 *    ERROR_INVALID_ARGUMENT - if the argument has been disposed
 * 
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 * @since 3.105
 */
public void setLinkForeground (Color color) {
	checkWidget();
	if (color != null) {
		if (color.isDisposed ()) error(SWT.ERROR_INVALID_ARGUMENT);
		if (color.equals(linkColor)) return;
	} else if (linkColor == null) return;
	linkColor = color;
	if (getEnabled()) {
		styleLinkParts();
		redraw();
	}
}

@Override
void setOrientation (boolean create) {
	super.setOrientation (create);
	layout.setOrientation (style & (SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT));
	if (!create) redraw (true);
}

/**
 * Sets the receiver's text.
 * 
 * The string can contain both regular text and hyperlinks.  A hyperlink
 * is delimited by an anchor tag, <a> and </a>.  Within an
 * anchor, a single HREF attribute is supported.  When a hyperlink is
 * selected, the text field of the selection event contains either the
 * text of the hyperlink or the value of its HREF, if one was specified.
 * In the rare case of identical hyperlinks within the same string, the
 * HREF attribute can be used to distinguish between them.  The string may
 * include the mnemonic character and line delimiters. The only delimiter
 * the HREF attribute supports is the quotation mark ("). Text containing
 * angle-bracket characters < or > may be escaped using \\, however
 * this operation is a hint and varies from platform to platform.
 * 
 * 
 * Mnemonics are indicated by an '&' that causes the next
 * character to be the mnemonic. The receiver can have a
 * mnemonic in the text preceding each link. When the user presses a
 * key sequence that matches the mnemonic, focus is assigned
 * to the link that follows the text. Mnemonics in links and in
 * the trailing text are ignored. 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.
 * 
 *
 * @param string the new text
 *
 * @exception IllegalArgumentException 
 *    ERROR_NULL_ARGUMENT - if the text is null
 * 
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
public void setText (String string) {
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (string.equals (text)) return;
	text = string;
	layout.setText (parse (string));
	focusIndex = offsets.length > 0 ? 0 : -1;
	selection.x = selection.y = -1;
	styleLinkParts();
	int [] bidiSegments = new int [offsets.length*2];
	for (int i = 0; i < offsets.length; i++) {
		Point point = offsets [i];
		bidiSegments[i*2] = point.x;
		bidiSegments[i*2+1] = point.y+1;
	}
	layout.setSegments (bidiSegments);
	TextStyle mnemonicStyle = new TextStyle (null, null, null);
	mnemonicStyle.underline = true;
	for (int i = 0; i < mnemonics.length; i++) {
		int mnemonic  = mnemonics [i];
		if (mnemonic != -1) {
			layout.setStyle (mnemonicStyle, mnemonic, mnemonic);
		}
	}
	redraw ();
}

@Override
void showWidget () {
	super.showWidget ();
	fixStyle (handle);
}

void styleLinkParts() {
	boolean enabled = (state & DISABLED) == 0;
	TextStyle linkStyle = new TextStyle (null, enabled ? getLinkForeground() : disabledColor, null);
	linkStyle.underline = true;
	for (int i = 0; i < offsets.length; i++) {
		Point point = offsets [i];
		layout.setStyle (linkStyle, point.x, point.y);
	}
}

@Override
int traversalCode(int key, long event) {
	if (offsets.length == 0) return 0;
	int bits = super.traversalCode (key, event);
	if (key == GDK.GDK_Tab && focusIndex < offsets.length - 1) {
		return bits & ~SWT.TRAVERSE_TAB_NEXT;
	}
	if (key == GDK.GDK_ISO_Left_Tab && focusIndex > 0) {
		return bits & ~SWT.TRAVERSE_TAB_PREVIOUS;
	}
	return bits;
}
}