bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/misc/ActivatorItem.java - platform/eclipse.platform.ui - Git at Google

 package org.eclipse.ui.internal.misc;

 /*
  * (c) Copyright IBM Corp. 2000, 2001.
  * All Rights Reserved.
  */
 import org.eclipse.jface.resource.ImageDescriptor;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.*;
 import org.eclipse.swt.graphics.*;
 import org.eclipse.swt.widgets.Canvas;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.ui.internal.IWorkbenchGraphicConstants;
 import org.eclipse.ui.internal.WorkbenchImages;


 /**
  * A Label which supports aligned text and/or an image and different border styles.
  * If there is not enough space a SmartLabel uses the following strategy to fit the information into the
  * available space:
  * <pre>
  * - ignores the indent in left align mode
  * - ignores the image and the gap
  * - shortens the text by replacing the center portion of the label with an ellipsis
  * - shortens the text by removing the center portion of the label
  * </pre>
  */
 public class ActivatorItem extends Canvas implements PaintListener,
 	MouseListener, DisposeListener
 {

 	protected String fText;
 	protected Image fImage;
 	static protected Image fCloseImage;
 	static protected int fInstanceCount;
 	protected ActivatorBar fParent;
 	protected boolean fPressed = false;
 	final static int GAP = 5;
 	/**
 	 * Create a SmartLabel with the given borderStyle as a child of parent.
 	 */
 	public ActivatorItem(ActivatorBar parent) {
 		super(parent, 0);
 		addInstance();
 		fParent = parent;
 		addPaintListener(this);
 		addMouseListener(this);
 		addDisposeListener(this);
 		fParent.addItem(this);
 	}
 /**
  * Add an instance.  Create the close image.
  */
 static private void addInstance() {
 	if (fInstanceCount == 0) {
 		ImageDescriptor desc = WorkbenchImages.getImageDescriptor(
 			IWorkbenchGraphicConstants.IMG_LCL_CLOSE_VIEW);
 		if (desc != null)
 			fCloseImage = desc.createImage();
 	}
 	++ fInstanceCount;
 }
 	//---- layout

 	/**
 	 * Compute the size.
  	 * @private
 	 */
 	public Point computeSize(int wHint, int hHint, boolean changed) {
 		Point e= getMinimumSize();
 		if (wHint != SWT.DEFAULT)
 			e.x= wHint;
 		if (hHint != SWT.DEFAULT)
 			e.y= hHint;
 		return e;
 	}
 	/**
 	 * Dispose the control.
 	 */
 	public void dispose() {
 		super.dispose();
 		fParent.removeItem(this);
 	}
 	//---- private stuff

 	/**
 	 * Draw a rectangle in the given colors.
 	 * @private
 	 */
 	private static void drawBevelRect(GC gc, int x, int y, int w, int h, Color topleft, Color bottomright) {

 		gc.setForeground(topleft);
 		gc.drawLine(x, y, x+w-1, y);
 		gc.drawLine(x, y, x, y+h-1);

 		gc.setForeground(bottomright);
 		gc.drawLine(x+w, y, x+w, y+h);
 		gc.drawLine(x, y+h, x+w, y+h);
 	}
 	/**
 	 * Return the SmartLabel's image or <code>null</code>.
 	 */
 	public Image getImage() {
 		return fImage;
 	}
 	/**
 	 * Compute the minimum size.
  	 * @private
 	 */
 	public Point getMinimumSize() {
 		Point size= new Point(0, 22);

 		// get image extent.
 		if (fImage != null) {
 			Rectangle r= fImage.getBounds();
 			size.x = r.width;
 		}

 		// get text extent.
 		if (fText != null && fText.length() > 0) {
 			GC gc= new GC(this);
 			Point e= gc.textExtent(fText);
 			size.x += e.x + 2 * GAP;
 			gc.dispose();
 		}

 		// get close button extent.
 		if (fCloseImage != null) {
 			Rectangle r= fCloseImage.getBounds();
 			size.x += r.width + 2;
 		}

 		return size;
 	}
 	//---- setters & getters

 	/**
 	 * Return the SmartLabel's label text.
 	 */
 	public String getText() {
 		return fText;
 	}
 /**
  * mouseDoubleClick method comment.
  */
 public void mouseDoubleClick(org.eclipse.swt.events.MouseEvent e) {}
 /**
  * mouseDown method comment.
  */
 public void mouseDown(org.eclipse.swt.events.MouseEvent e) {
 	if (e.button == 1) {
 		int textExtent = 100000;
 		if (fPressed && (fCloseImage != null))
 			textExtent = getClientArea().width - fCloseImage.getBounds().width - 4;
 		if (e.x < textExtent)
 			fParent.itemSelected(this);
 		else
 			fParent.itemClosePressed(this);
 	}
 }
 /**
  * mouseUp method comment.
  */
 public void mouseUp(org.eclipse.swt.events.MouseEvent e) {}
 	/**
 	 * Paint the Label's border.
 	 */
 	protected void paintBorder(GC gc, Rectangle r) {

 		Display disp= getDisplay();

 		Color c1= null;
 		Color c2= null;

 		if (fPressed) {
 			c1= disp.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
 			c2= disp.getSystemColor(SWT.COLOR_WIDGET_HIGHLIGHT_SHADOW);
 		} else {
 			c1= disp.getSystemColor(SWT.COLOR_WIDGET_LIGHT_SHADOW);
 			c2= disp.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
 		}

 		if (c1 != null && c2 != null) {
 			gc.setLineWidth(1);
 			drawBevelRect(gc, r.x, r.y, r.width-1, r.height-1, c1, c2);
 		}
 	}
 	/**
 	 * Paint the Label's border.
 	 */
 	protected void paintBorder(GC gc, Rectangle r, boolean bPressed) {

 		Display disp= getDisplay();

 		Color c1= null;
 		Color c2= null;

 		if (bPressed) {
 			c1= disp.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
 			c2= disp.getSystemColor(SWT.COLOR_WIDGET_HIGHLIGHT_SHADOW);
 		} else {
 			c1= disp.getSystemColor(SWT.COLOR_WIDGET_LIGHT_SHADOW);
 			c2= disp.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
 		}

 		if (c1 != null && c2 != null) {
 			gc.setLineWidth(1);
 			drawBevelRect(gc, r.x, r.y, r.width-1, r.height-1, c1, c2);
 		}
 	}
 	//---- painting

 	/**
  	 * Implements PaintListener.
  	 * @private
  	 */
 	public void paintControl(PaintEvent event) {

 		GC gc= event.gc;
 		Rectangle r= getClientArea();

 		// Draw background.
 		if (fPressed) {
 			gc.setBackground(getDisplay().getSystemColor(SWT.COLOR_WHITE));
 			gc.fillRectangle(r);
 		} else
 			ActivatorBar.paintGradient(getDisplay(), gc, r);

 		// Draw border.
 		paintBorder(gc, r);

 		// Get image extent.
 		int imageWidth = 0;
 		Image image= fImage;
 		Rectangle imageBounds = null;
 		if (image != null) {
 			imageBounds = image.getBounds();
 			imageWidth = image.getBounds().width;
 		}

 		// Get text extent.
 		Point textExtent = null;
 		if (fText != null && fText.length() > 0)
 			textExtent= gc.textExtent(fText);

 		// Get close button extent.
 		Rectangle closeBox = new Rectangle(0, 0, 0, 0);
 		if (fCloseImage != null) {
 			int width = fCloseImage.getBounds().width + 2;
 			closeBox = new Rectangle(r.x + r.width - width, r.y,
 				width, r.height);
 		}

 		// Shorten text as required.
 		boolean shortenText= false;
 		if (fText != null) {
 			int availableWidth= r.width - 2 * GAP - imageWidth - closeBox.width;
 			if (textExtent.x > availableWidth) {
 				image = null;
 				imageWidth = 0;
 				availableWidth= r.width - 2 * GAP - imageWidth - closeBox.width;
 				if (textExtent.x > availableWidth) {
 					shortenText= true;
 				}
 			}
 		}
 		String t= fText;
 		if (shortenText) {
 			int availableWidth= r.width - 2 * GAP - imageWidth - closeBox.width;
 			t= shortenText(gc, fText, availableWidth);
 			textExtent.x= gc.textExtent(t).x;
 			setToolTipText(fText);
 		} else {
 			setToolTipText(null);
 		}

 		// draw the image
 		int x= r.x;
 		if (image != null) {
 			gc.drawImage(image, 0, 0, imageBounds.width, imageBounds.height,
 				x, (r.height-imageBounds.height)/2, imageBounds.width, imageBounds.height);
 			x+= imageBounds.width;
 		}

 		// draw the text
 		if (t != null) {
 			x+= GAP;
 			gc.setForeground(getDisplay().getSystemColor(SWT.COLOR_BLACK));
 			gc.drawText(t, x, r.y + (r.height - textExtent.y) / 2, true);
 		}

 		// draw the close box.
 		if (fPressed && (fCloseImage != null)) {
 			closeBox.x += 1;
 			closeBox.width -= 2;
 			closeBox.y += 1;
 			closeBox.height -= 2;
 			gc.setBackground(getDisplay().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND));
 			gc.fillRectangle(closeBox);
 			Rectangle imgBounds = fCloseImage.getBounds();
 			gc.drawImage(fCloseImage, 0, 0, imgBounds.width, imgBounds.height,
 				closeBox.x + (closeBox.width-imgBounds.width) / 2,
 				closeBox.y + (closeBox.height-imgBounds.height) / 2,
 				imgBounds.width, imgBounds.height);
 			paintBorder(gc, closeBox, false);
 		}
 	}
 /**
  * Remove an instance.  Dispose the close image.
  */
 static private void removeInstance() {
 	-- fInstanceCount;
 	if (fInstanceCount <= 0) {
 	    if (fCloseImage != null) {
 			fCloseImage.dispose();
 			fCloseImage = null;
 	    }
 	}
 }
 	/**
 	 * Sets the widget's font to the given value and forces
 	 * a redraw of the widget.
 	 */
 	public void setFont(Font font) {
 		super.setFont(font);
 		redraw();
 	}
 	/**
 	 * Set the SmartLabel's Image.
 	 * The value <code>null</code> clears it.
 	 */
 	public void setImage(Image image) {
 		if (image != fImage) {
 			fImage= image;
 			redraw();
 		}
 	}
 	/**
 	 * Sets the control state.
 	 */
 	public void setPressed(boolean pressed) {
 		fPressed = pressed;
 		redraw();
 	}
 	/**
 	 * Set the SmartLabel's label text.
 	 * The value <code>null</code> clears it.
 	 */
 	public void setText(String text) {
 		if (text == null)
 			text= "";//$NON-NLS-1$
 		if (!text.equals(fText)) {
 			fText= text;
 		}
 		fParent.layout();
 		redraw();
 	}
 	/**
 	 * Shorten the given text <code>t</code> so that its length doesn't exceed
 	 * the given width. The default implementation replaces characters in the
 	 * center of the original string with an ellipsis ("...").
 	 * Override if you need a different strategy.
 	 */
 	protected String shortenText(GC gc, String t, int width) {
 		String ellipsis= "...";//$NON-NLS-1$
 		int w= gc.textExtent(ellipsis).x;
 		int l= t.length();
 		int pivot= l/2;
 		int s= pivot;
 		int e= pivot+1;
 		while (s >= 0 && e < l) {
 			String s1= t.substring(0, s);
 			String s2= t.substring(e, l);
 			int l1= gc.textExtent(s1).x;
 			int l2= gc.textExtent(s2).x;
 			if (l1+w+l2 < width) {
 				t= s1 + ellipsis + s2;
 				break;
 			}
 			s--;
 			e++;
 		}
 		return t;
 	}
 /**
  * widgetDisposed method comment.
  */
 public void widgetDisposed(org.eclipse.swt.events.DisposeEvent e) {
 	if (fImage != null)
 		fImage.dispose();
 	removeInstance();
 }
 }
	package org.eclipse.ui.internal.misc;

	/*
	* (c) Copyright IBM Corp. 2000, 2001.
	* All Rights Reserved.
	*/
	import org.eclipse.jface.resource.ImageDescriptor;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.*;
	import org.eclipse.swt.graphics.*;
	import org.eclipse.swt.widgets.Canvas;
	import org.eclipse.swt.widgets.Display;
	import org.eclipse.ui.internal.IWorkbenchGraphicConstants;
	import org.eclipse.ui.internal.WorkbenchImages;


	/**
	* A Label which supports aligned text and/or an image and different border styles.
	* If there is not enough space a SmartLabel uses the following strategy to fit the information into the
	* available space:
	* <pre>
	* - ignores the indent in left align mode
	* - ignores the image and the gap
	* - shortens the text by replacing the center portion of the label with an ellipsis
	* - shortens the text by removing the center portion of the label
	* </pre>
	*/
	public class ActivatorItem extends Canvas implements PaintListener,
	MouseListener, DisposeListener
	{

	protected String fText;
	protected Image fImage;
	static protected Image fCloseImage;
	static protected int fInstanceCount;
	protected ActivatorBar fParent;
	protected boolean fPressed = false;
	final static int GAP = 5;
	/**
	* Create a SmartLabel with the given borderStyle as a child of parent.
	*/
	public ActivatorItem(ActivatorBar parent) {
	super(parent, 0);
	addInstance();
	fParent = parent;
	addPaintListener(this);
	addMouseListener(this);
	addDisposeListener(this);
	fParent.addItem(this);
	}
	/**
	* Add an instance. Create the close image.
	*/
	static private void addInstance() {
	if (fInstanceCount == 0) {
	ImageDescriptor desc = WorkbenchImages.getImageDescriptor(
	IWorkbenchGraphicConstants.IMG_LCL_CLOSE_VIEW);
	if (desc != null)
	fCloseImage = desc.createImage();
	}
	++ fInstanceCount;
	}
	//---- layout

	/**
	* Compute the size.
	* @private
	*/
	public Point computeSize(int wHint, int hHint, boolean changed) {
	Point e= getMinimumSize();
	if (wHint != SWT.DEFAULT)
	e.x= wHint;
	if (hHint != SWT.DEFAULT)
	e.y= hHint;
	return e;
	}
	/**
	* Dispose the control.
	*/
	public void dispose() {
	super.dispose();
	fParent.removeItem(this);
	}
	//---- private stuff

	/**
	* Draw a rectangle in the given colors.
	* @private
	*/
	private static void drawBevelRect(GC gc, int x, int y, int w, int h, Color topleft, Color bottomright) {

	gc.setForeground(topleft);
	gc.drawLine(x, y, x+w-1, y);
	gc.drawLine(x, y, x, y+h-1);

	gc.setForeground(bottomright);
	gc.drawLine(x+w, y, x+w, y+h);
	gc.drawLine(x, y+h, x+w, y+h);
	}
	/**
	* Return the SmartLabel's image or <code>null</code>.
	*/
	public Image getImage() {
	return fImage;
	}
	/**
	* Compute the minimum size.
	* @private
	*/
	public Point getMinimumSize() {
	Point size= new Point(0, 22);

	// get image extent.
	if (fImage != null) {
	Rectangle r= fImage.getBounds();
	size.x = r.width;
	}

	// get text extent.
	if (fText != null && fText.length() > 0) {
	GC gc= new GC(this);
	Point e= gc.textExtent(fText);
	size.x += e.x + 2 * GAP;
	gc.dispose();
	}

	// get close button extent.
	if (fCloseImage != null) {
	Rectangle r= fCloseImage.getBounds();
	size.x += r.width + 2;
	}

	return size;
	}
	//---- setters & getters

	/**
	* Return the SmartLabel's label text.
	*/
	public String getText() {
	return fText;
	}
	/**
	* mouseDoubleClick method comment.
	*/
	public void mouseDoubleClick(org.eclipse.swt.events.MouseEvent e) {}
	/**
	* mouseDown method comment.
	*/
	public void mouseDown(org.eclipse.swt.events.MouseEvent e) {
	if (e.button == 1) {
	int textExtent = 100000;
	if (fPressed && (fCloseImage != null))
	textExtent = getClientArea().width - fCloseImage.getBounds().width - 4;
	if (e.x < textExtent)
	fParent.itemSelected(this);
	else
	fParent.itemClosePressed(this);
	}
	}
	/**
	* mouseUp method comment.
	*/
	public void mouseUp(org.eclipse.swt.events.MouseEvent e) {}
	/**
	* Paint the Label's border.
	*/
	protected void paintBorder(GC gc, Rectangle r) {

	Display disp= getDisplay();

	Color c1= null;
	Color c2= null;

	if (fPressed) {
	c1= disp.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
	c2= disp.getSystemColor(SWT.COLOR_WIDGET_HIGHLIGHT_SHADOW);
	} else {
	c1= disp.getSystemColor(SWT.COLOR_WIDGET_LIGHT_SHADOW);
	c2= disp.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
	}

	if (c1 != null && c2 != null) {
	gc.setLineWidth(1);
	drawBevelRect(gc, r.x, r.y, r.width-1, r.height-1, c1, c2);
	}
	}
	/**
	* Paint the Label's border.
	*/
	protected void paintBorder(GC gc, Rectangle r, boolean bPressed) {

	Display disp= getDisplay();

	Color c1= null;
	Color c2= null;

	if (bPressed) {
	c1= disp.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
	c2= disp.getSystemColor(SWT.COLOR_WIDGET_HIGHLIGHT_SHADOW);
	} else {
	c1= disp.getSystemColor(SWT.COLOR_WIDGET_LIGHT_SHADOW);
	c2= disp.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
	}

	if (c1 != null && c2 != null) {
	gc.setLineWidth(1);
	drawBevelRect(gc, r.x, r.y, r.width-1, r.height-1, c1, c2);
	}
	}
	//---- painting

	/**
	* Implements PaintListener.
	* @private
	*/
	public void paintControl(PaintEvent event) {

	GC gc= event.gc;
	Rectangle r= getClientArea();

	// Draw background.
	if (fPressed) {
	gc.setBackground(getDisplay().getSystemColor(SWT.COLOR_WHITE));
	gc.fillRectangle(r);
	} else
	ActivatorBar.paintGradient(getDisplay(), gc, r);

	// Draw border.
	paintBorder(gc, r);

	// Get image extent.
	int imageWidth = 0;
	Image image= fImage;
	Rectangle imageBounds = null;
	if (image != null) {
	imageBounds = image.getBounds();
	imageWidth = image.getBounds().width;
	}

	// Get text extent.
	Point textExtent = null;
	if (fText != null && fText.length() > 0)
	textExtent= gc.textExtent(fText);

	// Get close button extent.
	Rectangle closeBox = new Rectangle(0, 0, 0, 0);
	if (fCloseImage != null) {
	int width = fCloseImage.getBounds().width + 2;
	closeBox = new Rectangle(r.x + r.width - width, r.y,
	width, r.height);
	}

	// Shorten text as required.
	boolean shortenText= false;
	if (fText != null) {
	int availableWidth= r.width - 2 * GAP - imageWidth - closeBox.width;
	if (textExtent.x > availableWidth) {
	image = null;
	imageWidth = 0;
	availableWidth= r.width - 2 * GAP - imageWidth - closeBox.width;
	if (textExtent.x > availableWidth) {
	shortenText= true;
	}
	}
	}
	String t= fText;
	if (shortenText) {
	int availableWidth= r.width - 2 * GAP - imageWidth - closeBox.width;
	t= shortenText(gc, fText, availableWidth);
	textExtent.x= gc.textExtent(t).x;
	setToolTipText(fText);
	} else {
	setToolTipText(null);
	}

	// draw the image
	int x= r.x;
	if (image != null) {
	gc.drawImage(image, 0, 0, imageBounds.width, imageBounds.height,
	x, (r.height-imageBounds.height)/2, imageBounds.width, imageBounds.height);
	x+= imageBounds.width;
	}

	// draw the text
	if (t != null) {
	x+= GAP;
	gc.setForeground(getDisplay().getSystemColor(SWT.COLOR_BLACK));
	gc.drawText(t, x, r.y + (r.height - textExtent.y) / 2, true);
	}

	// draw the close box.
	if (fPressed && (fCloseImage != null)) {
	closeBox.x += 1;
	closeBox.width -= 2;
	closeBox.y += 1;
	closeBox.height -= 2;
	gc.setBackground(getDisplay().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND));
	gc.fillRectangle(closeBox);
	Rectangle imgBounds = fCloseImage.getBounds();
	gc.drawImage(fCloseImage, 0, 0, imgBounds.width, imgBounds.height,
	closeBox.x + (closeBox.width-imgBounds.width) / 2,
	closeBox.y + (closeBox.height-imgBounds.height) / 2,
	imgBounds.width, imgBounds.height);
	paintBorder(gc, closeBox, false);
	}
	}
	/**
	* Remove an instance. Dispose the close image.
	*/
	static private void removeInstance() {
	-- fInstanceCount;
	if (fInstanceCount <= 0) {
	if (fCloseImage != null) {
	fCloseImage.dispose();
	fCloseImage = null;
	}
	}
	}
	/**
	* Sets the widget's font to the given value and forces
	* a redraw of the widget.
	*/
	public void setFont(Font font) {
	super.setFont(font);
	redraw();
	}
	/**
	* Set the SmartLabel's Image.
	* The value <code>null</code> clears it.
	*/
	public void setImage(Image image) {
	if (image != fImage) {
	fImage= image;
	redraw();
	}
	}
	/**
	* Sets the control state.
	*/
	public void setPressed(boolean pressed) {
	fPressed = pressed;
	redraw();
	}
	/**
	* Set the SmartLabel's label text.
	* The value <code>null</code> clears it.
	*/
	public void setText(String text) {
	if (text == null)
	text= "";//$NON-NLS-1$
	if (!text.equals(fText)) {
	fText= text;
	}
	fParent.layout();
	redraw();
	}
	/**
	* Shorten the given text <code>t</code> so that its length doesn't exceed
	* the given width. The default implementation replaces characters in the
	* center of the original string with an ellipsis ("...").
	* Override if you need a different strategy.
	*/
	protected String shortenText(GC gc, String t, int width) {
	String ellipsis= "...";//$NON-NLS-1$
	int w= gc.textExtent(ellipsis).x;
	int l= t.length();
	int pivot= l/2;
	int s= pivot;
	int e= pivot+1;
	while (s >= 0 && e < l) {
	String s1= t.substring(0, s);
	String s2= t.substring(e, l);
	int l1= gc.textExtent(s1).x;
	int l2= gc.textExtent(s2).x;
	if (l1+w+l2 < width) {
	t= s1 + ellipsis + s2;
	break;
	}
	s--;
	e++;
	}
	return t;
	}
	/**
	* widgetDisposed method comment.
	*/
	public void widgetDisposed(org.eclipse.swt.events.DisposeEvent e) {
	if (fImage != null)
	fImage.dispose();
	removeInstance();
	}
	}