Java Code Examples for org.eclipse.swt.graphics.FontMetrics#getAscent()

/**
 * Returns the difference between the baseline of the widget and the
 * baseline as specified by the font for <code>gc</code>. When drawing
 * line numbers, the returned bias should be added to obtain text lined up
 * on the correct base line of the text widget.
 *
 * @param gc the <code>GC</code> to get the font metrics from
 * @param widgetLine the widget line
 * @return the baseline bias to use when drawing text that is lined up with
 *         <code>fCachedTextWidget</code>
 * @since 3.2
 */
private int getBaselineBias(GC gc, int widgetLine) {
	/*
	 * https://bugs.eclipse.org/bugs/show_bug.cgi?id=62951
	 * widget line height may be more than the font height used for the
	 * line numbers, since font styles (bold, italics...) can have larger
	 * font metrics than the simple font used for the numbers.
	 */
	int offset= fCachedTextWidget.getOffsetAtLine(widgetLine);
	int widgetBaseline= fCachedTextWidget.getBaseline(offset);

	FontMetrics fm= gc.getFontMetrics();
	int fontBaseline= fm.getAscent() + fm.getLeading();
	int baselineBias= widgetBaseline - fontBaseline;
	return Math.max(0, baselineBias);
}
 

private PrintPiece internalNext(int width, int height) {
	FontMetrics fm = gc.getFontMetrics();

	final int lineHeight = fm.getHeight();
	if (height < lineHeight)
		return null;

	final int maxLines = height / lineHeight;
	String[] nextLines = nextLines(width, maxLines);
	if (nextLines.length == 0)
		return null;

	int maxWidth = maxExtent(nextLines).x;
	Point size = new Point(maxWidth, nextLines.length * lineHeight);
	int ascent = fm.getAscent() + fm.getLeading();

	return new TextPiece(device, style, nextLines, size, ascent);
}
 

private int getBaselineBias(GC gc, int widgetLine) {
    /*
     * https://bugs.eclipse.org/bugs/show_bug.cgi?id=62951
     * widget line height may be more than the font height used for the
     * line numbers, since font styles (bold, italics...) can have larger
     * font metrics than the simple font used for the numbers.
     */
    int offset= fCachedTextWidget.getOffsetAtLine(widgetLine);
    int widgetBaseline= fCachedTextWidget.getBaseline(offset);

    FontMetrics fm= gc.getFontMetrics();
    int fontBaseline= fm.getAscent() + fm.getLeading();
    int baselineBias= widgetBaseline - fontBaseline;
    return Math.max(0, baselineBias);
}
 

/**
 * Draw string at widget offset.
 * 
 * @param gc
 * @param offset
 *            the widget offset
 * @param s
 *            the string to be drawn
 * @param fg
 *            the foreground color
 */
private void draw(GC gc, int offset, String s, Color fg)
{
	// Compute baseline delta (see
	// https://bugs.eclipse.org/bugs/show_bug.cgi?id=165640)
	int baseline = fTextWidget.getBaseline(offset);
	FontMetrics fontMetrics = gc.getFontMetrics();
	int fontBaseline = fontMetrics.getAscent() + fontMetrics.getLeading();
	int baslineDelta = baseline - fontBaseline;

	Point pos = fTextWidget.getLocationAtOffset(offset);
	gc.setForeground(fg);
	gc.drawString(s, pos.x, pos.y + baslineDelta, true);
}
 

@Override
public void paint(GC gc, Rectangle area) {
	if (!this.state.isRendering()) {
		return;
	}

	FontMetrics metrics = gc.getFontMetrics();
	FontMetrics metricsToUse = metrics;
	int baseline = metrics.getAscent() + metrics.getLeading();

	int yAdvance = 0;
	if (this.state.getCurrentLineHeight() > metrics.getHeight()) {
		int biggerBaseline = this.state.getCurrentBiggestFontMetrics().getAscent() + this.state.getCurrentBiggestFontMetrics().getLeading();
		yAdvance = biggerBaseline - baseline;

		metricsToUse = this.state.getCurrentBiggestFontMetrics();
	}

	Point pointer = this.state.getPointer();

	// on alignment justify render word by word
	int textLength = 0;
	if (TextAlignment.JUSTIFY.equals(this.state.getTextAlignment())) {
		LinePainter line = this.state.getCurrentLine();
		for (String word : this.words) {
			gc.drawText(word, pointer.x, pointer.y + yAdvance, (!this.state.hasPreviousBgColor()));
			int length = gc.textExtent(word).x + line.getNextJustifySpace();
			pointer.x += length;
			textLength += length;
		}
	} else {
		textLength = getTextLength(gc);
		gc.drawText(text, pointer.x, pointer.y + yAdvance, (!this.state.hasPreviousBgColor()));
	}

	if (this.state.isUnderlineActive()) {
		int underlineY = pointer.y + baseline + yAdvance + (metricsToUse.getDescent() / 2);
		gc.drawLine(pointer.x, underlineY, pointer.x + textLength, underlineY);
	}
	if (this.state.isStrikethroughActive()) {
		int strikeY = pointer.y + yAdvance + (metrics.getHeight() / 2) + (metrics.getLeading() / 2);
		gc.drawLine(pointer.x, strikeY, pointer.x + textLength, strikeY);
	}

	if (!TextAlignment.JUSTIFY.equals(this.state.getTextAlignment())) {
		pointer.x += textLength;
	}
}
 

public void paint(final GC gc, final int x, final int y) {
	Font oldFont = gc.getFont();
	Color oldForeground = gc.getForeground();
	Color oldBackground = gc.getBackground();

	final int width = getSize().x;
	final int align = style.getAlignment();

	try {
		boolean transparent = initGC(gc);

		FontMetrics fm = gc.getFontMetrics();
		int lineHeight = fm.getHeight();

		boolean strikeout = style.getStrikeout();
		boolean underline = style.getUnderline();
		int lineThickness = Math.max(1, fm.getDescent() / 3);
		int strikeoutOffset = fm.getLeading() + fm.getAscent() / 2;
		int underlineOffset = ascent + lineThickness;

		for (int i = 0; i < lines.length; i++) {
			String line = lines[i];
			int lineWidth = gc.stringExtent(line).x;
			int offset = getHorzAlignmentOffset(align, lineWidth, width);

			gc.drawString(lines[i], x + offset, y + lineHeight * i,
					transparent);
			if (strikeout || underline) {
				Color saveBackground = gc.getBackground();
				gc.setBackground(gc.getForeground());
				if (strikeout)
					gc.fillRectangle(x + offset, y + lineHeight * i
							+ strikeoutOffset, lineWidth, lineThickness);
				if (underline)
					gc.fillRectangle(x + offset, y + lineHeight * i
							+ underlineOffset, lineWidth, lineThickness);
				gc.setBackground(saveBackground);
			}
		}
	} finally {
		restoreGC(gc, oldFont, oldForeground, oldBackground);
	}
}
 

public float getFMAscent(){
	this.setAdvanced(false);
	
	FontMetrics fm = this.getControl().getFontMetrics();
	return (fm.getAscent() + fm.getLeading());
}