import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Insets;
-import java.awt.Shape;
-import java.awt.font.FontRenderContext;
-import java.awt.font.LineMetrics;
-import java.awt.geom.AffineTransform;
+import java.awt.Point;
+import java.awt.Rectangle;
+import javax.swing.SwingUtilities;
import javax.swing.UIManager;
public void paintBorder(Component c, Graphics g,
int x, int y, int width, int height)
{
- Measurements mes = getMeasurements(c);
- Font oldFont = g.getFont();
- Color oldColor = g.getColor();
-
- /**
- * A local helper class for painting the border without changing
- * any pixels inside the rectangle of the title text.
- */
- class BorderPainter
- {
- private Component c;
- private Border b;
- private int x, y, width, height;
-
- /**
- * Constructs a BorderPainter.
- *
- * @param c the component whose border is being painted.
- * @param b the border object.
- * @param x the x coordinate of the rectangle delimiting the border.
- * @param y the y coordinate of the rectangle delimiting the border.
- * @param width the width of the rectangle delimiting the border.
- * @param height the width of the rectangle delimiting the border.
- */
- public BorderPainter(Component c, Border b,
- int x, int y, int width, int height)
- {
- this.c = c;
- this.b = b;
- this.x = x;
- this.y = y;
- this.width = width;
- this.height = height;
- }
+ Rectangle borderRect = new Rectangle(x + EDGE_SPACING, y + EDGE_SPACING,
+ width - (EDGE_SPACING * 2),
+ height - (EDGE_SPACING * 2));
+ Point textLoc = new Point();
+
+ // Save color and font.
+ Color savedColor = g.getColor();
+ Font savedFont = g.getFont();
+
+ // The font metrics.
+ Font font = getFont(c);
+ g.setFont(font);
+ FontMetrics fm = c.getFontMetrics(font);
+
+ layoutBorderWithTitle(c, fm, borderRect, textLoc);
+ paintBorderWithTitle(c, g, x, y, width, height, borderRect, textLoc, fm);
+
+ g.setColor(getTitleColor());
+ g.drawString(getTitle(), textLoc.x, textLoc.y);
+ g.setFont(savedFont);
+ g.setColor(savedColor);
+ }
+ /**
+ * Calculates the bounding box of the inner border and the location of the
+ * title string.
+ *
+ * @param c the component on which to paint the border
+ * @param fm the font metrics
+ * @param borderRect output parameter, holds the bounding box of the inner
+ * border on method exit
+ * @param textLoc output parameter, holds the location of the title text
+ * on method exit
+ */
+ private void layoutBorderWithTitle(Component c, FontMetrics fm,
+ Rectangle borderRect,
+ Point textLoc)
+ {
+ Border b = getBorder();
+
+ // The font metrics.
+ int fontHeight = fm.getHeight();
+ int fontDescent = fm.getDescent();
+ int fontAscent = fm.getAscent();
+ int titleWidth = fm.stringWidth(getTitle());
+
+ // The base insets.
+ Insets insets;
+ if (b == null)
+ insets = new Insets(0, 0, 0, 0);
+ else
+ insets = b.getBorderInsets(c);
- /**
- * Paints the entire border.
- */
- public void paint(Graphics g)
- {
- if (b != null)
- b.paintBorder(c, g, x, y, width, height);
- }
+ // The offset of the border rectangle, dependend on the title placement.
+ int offset;
+ // Layout border and text vertically.
+ int titlePosition = getTitlePosition();
+ switch (titlePosition)
+ {
+ case ABOVE_BOTTOM:
+ textLoc.y = borderRect.y + borderRect.height - insets.bottom
+ - fontDescent - TEXT_SPACING;
+ break;
+ case BOTTOM:
+ borderRect.height -= fontHeight / 2;
+ textLoc.y = borderRect.y + borderRect.height - fontDescent
+ + (fontAscent + fontDescent - insets.bottom) / 2;
+ break;
+ case BELOW_BOTTOM:
+ borderRect.height -= fontHeight;
+ textLoc.y = borderRect.y + borderRect.height + fontAscent
+ + TEXT_SPACING;
+ break;
+ case ABOVE_TOP:
+ offset = fontAscent + fontDescent
+ + Math.max(EDGE_SPACING, TEXT_SPACING * 2) - EDGE_SPACING;
+ borderRect.y += offset;
+ borderRect.height -= offset;
+ textLoc.y = borderRect.y - (fontDescent + TEXT_SPACING);
+ break;
+ case BELOW_TOP:
+ textLoc.y = borderRect.y + insets.top + fontAscent + TEXT_SPACING;
+ break;
+ case TOP:
+ case DEFAULT_POSITION:
+ default:
+ offset = Math.max(0, ((fontAscent / 2) + TEXT_SPACING) - EDGE_SPACING);
+ borderRect.y += offset;
+ borderRect.height -= offset;
+ textLoc.y = borderRect.y - fontDescent
+ + (insets.top + fontAscent + fontDescent) / 2;
+ break;
+ }
- /**
- * Paints the border, clipping the drawing operation to a
- * given rectangular area.
- */
- private void paint(Graphics g,
- int clipX, int clipY, int clipWidth, int clipHeight)
+ // Layout border and text horizontally.
+ int justification = getTitleJustification();
+ // Adjust justification for LEADING and TRAILING depending on the direction
+ // of the component.
+ if (c.getComponentOrientation().isLeftToRight())
{
- Shape oldClip = g.getClip();
- try
- {
- g.clipRect(clipX, clipY, clipWidth, clipHeight);
- paint(g);
- }
- finally
- {
- g.setClip(oldClip);
- }
+ if (justification == LEADING || justification == DEFAULT_JUSTIFICATION)
+ justification = LEFT;
+ else if (justification == TRAILING)
+ justification = RIGHT;
}
-
-
- /**
- * Paints the border without affecting a given rectangular area.
- * This is used for painting the border without drawing anything
- * underneath the title text.
- *
- * <p>Since we do not want to introduce unnecessary dependencies
- * on Java 2D, we perform the clipping without constructive geometry
- * (provided by java.awt.geom.Area). Instead, the border’s
- * bounding rectangle is split into smaller parts, which are then
- * clipped and painted individually.:
- *
- * <p><pre>
- * +--------------------+ +--------------------+
- * | | | 1 |
- * | +--------+ | +---+--------+-------+
- * | | hole | | |====> | 2 | hole | 3 |
- * | +--------+ | |---+--------+-------+
- * | | | 4 |
- * +--------------------+ +--------------------+</pre>
- *
- */
- public void paintExcept(Graphics g,
- int holeX, int holeY, int holeWidth, int holeHeight)
+ else
{
- int stripeHeight;
-
- stripeHeight = holeY - y;
- if (stripeHeight > 0)
- paint(g, x, y, width, stripeHeight); // patch #1 in the image above
-
- stripeHeight = holeHeight;
- if (stripeHeight > 0)
- {
- paint(g, x, holeY, holeX - x, stripeHeight); // patches #2 and #3
- paint(g, holeX + holeWidth, holeY, x + width - (holeX + holeWidth), stripeHeight);
- }
-
- stripeHeight = height - (holeY - y + holeHeight);
- if (stripeHeight > 0)
- paint(g, x, y + height - stripeHeight, width, stripeHeight); // #4
+ if (justification == LEADING || justification == DEFAULT_JUSTIFICATION)
+ justification = RIGHT;
+ else if (justification == TRAILING)
+ justification = LEFT;
}
- };
-
- BorderPainter bp;
- int textX, textY, borderWidth, borderHeight;
-
- borderWidth = width - (mes.outerSpacing.left + mes.outerSpacing.right);
- borderHeight = height - (mes.outerSpacing.top + mes.outerSpacing.bottom);
- bp = new BorderPainter(c, getBorder(),
- x + mes.outerSpacing.left, y + mes.outerSpacing.top,
- borderWidth, borderHeight);
- switch (getRealTitleJustification(c))
+ switch (justification)
{
- case LEFT:
- textX = x + EDGE_SPACING + TEXT_INSET_H;
- break;
-
- case CENTER:
- textX = x + (borderWidth - mes.textWidth) / 2;
- break;
-
- case RIGHT:
- textX = x + borderWidth - (mes.textWidth + TEXT_INSET_H);
- break;
-
- default:
- throw new IllegalStateException();
+ case CENTER:
+ textLoc.x = borderRect.x + (borderRect.width - titleWidth) / 2;
+ break;
+ case RIGHT:
+ textLoc.x = borderRect.x + borderRect.width - titleWidth
+ - TEXT_INSET_H - insets.right;
+ break;
+ case LEFT:
+ default:
+ textLoc.x = borderRect.x + TEXT_INSET_H + insets.left;
}
+ }
- switch (titlePosition)
- {
- case ABOVE_TOP:
- textY = y + EDGE_SPACING;
- break;
-
- case TOP:
- case DEFAULT_POSITION:
- default:
- textY = y + mes.outerSpacing.top + mes.borderInsets.top - mes.textAscent
- + mes.lineHeight;
- break;
-
- case BELOW_TOP:
- textY = y + mes.outerSpacing.top + mes.borderInsets.top + TEXT_SPACING;
- break;
-
- case ABOVE_BOTTOM:
- textY = y + height - mes.outerSpacing.bottom - mes.borderInsets.bottom
- - TEXT_SPACING - (mes.textAscent + mes.textDescent);
- break;
-
- case BOTTOM:
- case BELOW_BOTTOM:
- textY = y + height - (mes.textAscent + mes.textDescent);
- break;
- }
+ /**
+ * Paints the border with the title.
+ *
+ * @param c the component to paint on
+ * @param g the graphics context used for paintin
+ * @param x the upper left corner of the whole border
+ * @param y the upper left corner of the whole border
+ * @param width the width of the whole border
+ * @param height the width of the whole border
+ * @param borderRect the bounding box of the inner border
+ * @param textLoc the location of the border title
+ * @param fm the font metrics of the title
+ */
+ private void paintBorderWithTitle(Component c, Graphics g, int x, int y,
+ int width, int height,
+ Rectangle borderRect, Point textLoc,
+ FontMetrics fm)
+ {
+ Border b = getBorder();
+ int fontDescent = fm.getDescent();
+ int fontAscent = fm.getAscent();
+ int titleWidth = fm.stringWidth(getTitle());
- if (mes.trimmedText == null)
- bp.paint(g);
- else
- {
- try
+ if (b != null)
{
- g.setFont(mes.font);
- g.setColor(getTitleColor());
- g.drawString(mes.trimmedText, textX, textY + mes.textAscent);
+ // Paint border in segments, when the title is painted above the
+ // border.
+ if (((titlePosition == TOP || titlePosition == DEFAULT_POSITION)
+ && (borderRect.y > textLoc.y - fontAscent))
+ || (titlePosition == BOTTOM
+ && borderRect.y + borderRect.height < textLoc.y + fontDescent))
+ {
+ Rectangle clip = new Rectangle();
+ Rectangle saved = g.getClipBounds();
+
+ // Paint border left from the text.
+ clip.setBounds(saved);
+ SwingUtilities.computeIntersection(x, y, textLoc.x - x - 1,
+ height, clip);
+ if (! clip.isEmpty())
+ {
+ g.setClip(clip);
+ b.paintBorder(c, g, borderRect.x, borderRect.y,
+ borderRect.width,
+ borderRect.height);
+ }
+ // Paint border right from the text.
+ clip.setBounds(saved);
+ SwingUtilities.computeIntersection(textLoc.x + titleWidth + 1, y,
+ x + width - (textLoc.x + titleWidth + 1), height, clip);
+ if (! clip.isEmpty())
+ {
+ g.setClip(clip);
+ b.paintBorder(c, g, borderRect.x, borderRect.y,
+ borderRect.width,
+ borderRect.height);
+ }
+
+ if (titlePosition == TOP || titlePosition == DEFAULT_POSITION)
+ {
+ // Paint border below the text.
+ clip.setBounds(saved);
+ SwingUtilities.computeIntersection(textLoc.x - 1,
+ textLoc.y + fontDescent,
+ titleWidth + 2,
+ y + height - textLoc.y - fontDescent,
+ clip);
+ if (! clip.isEmpty())
+ {
+ g.setClip(clip);
+ b.paintBorder(c, g, borderRect.x, borderRect.y,
+ borderRect.width,
+ borderRect.height);
+ }
+
+ }
+ else
+ {
+ // Paint border above the text.
+ clip.setBounds(saved);
+ SwingUtilities.computeIntersection(textLoc.x - 1, y,
+ titleWidth + 2,
+ textLoc.y - fontDescent - y,
+ clip);
+ if (! clip.isEmpty())
+ {
+ g.setClip(clip);
+ b.paintBorder(c, g, borderRect.x, borderRect.y,
+ borderRect.width,
+ borderRect.height);
+ }
+
+ }
+ g.setClip(saved);
+ }
+ else
+ {
+ b.paintBorder(c, g, borderRect.x, borderRect.y, borderRect.width,
+ borderRect.height);
+ }
}
- finally
- {
- g.setFont(oldFont);
- g.setColor(oldColor);
- }
- bp.paintExcept(g, textX, textY,
- mes.textWidth, mes.textAscent + mes.textDescent);
- }
}
-
-
+
/**
* Measures the width of this border.
*
*/
public Insets getBorderInsets(Component c, Insets insets)
{
- return getMeasurements(c).getContentInsets(insets);
+ // Initialize insets with the insets from our border.
+ Border border = getBorder();
+ if (border != null)
+ {
+ if (border instanceof AbstractBorder)
+ {
+ AbstractBorder aBorder = (AbstractBorder) border;
+ aBorder.getBorderInsets(c, insets);
+ }
+ else
+ {
+ Insets i = border.getBorderInsets(c);
+ insets.top = i.top;
+ insets.bottom = i.bottom;
+ insets.left = i.left;
+ insets.right = i.right;
+ }
+ }
+ else
+ {
+ insets.top = 0;
+ insets.bottom = 0;
+ insets.left = 0;
+ insets.right = 0;
+ }
+
+ // Add spacing.
+ insets.top += EDGE_SPACING + TEXT_SPACING;
+ insets.bottom += EDGE_SPACING + TEXT_SPACING;
+ insets.left += EDGE_SPACING + TEXT_SPACING;
+ insets.right += EDGE_SPACING + TEXT_SPACING;
+
+ String title = getTitle();
+ if (c != null && title != null && !title.equals(""))
+ {
+ Font font = getFont(c);
+ FontMetrics fm = c.getFontMetrics(font);
+ int ascent = fm.getAscent();
+ int descent = fm.getDescent();
+ int height = fm.getHeight();
+ switch (getTitlePosition())
+ {
+ case ABOVE_BOTTOM:
+ insets.bottom += ascent + descent + TEXT_SPACING;
+ break;
+ case BOTTOM:
+ insets.bottom += ascent + descent;
+ break;
+ case BELOW_BOTTOM:
+ insets.bottom += height;
+ break;
+ case ABOVE_TOP:
+ insets.top += ascent + descent +
+ Math.max(EDGE_SPACING, TEXT_SPACING * 2)
+ - EDGE_SPACING;
+ break;
+ case BELOW_TOP:
+ insets.top += ascent + descent + TEXT_SPACING;
+ break;
+ case TOP:
+ case DEFAULT_POSITION:
+ default:
+ insets.top += ascent + descent;
+ }
+ }
+ return insets;
}
*/
public Dimension getMinimumSize(Component c)
{
- return getMeasurements(c).getMinimumSize();
+ Insets i = getBorderInsets(c);
+ Dimension minSize = new Dimension(i.left + i.right, i.top + i.bottom);
+ Font font = getFont(c);
+ FontMetrics fm = c.getFontMetrics(font);
+ int titleWidth = fm.stringWidth(getTitle());
+ switch (getTitlePosition())
+ {
+ case ABOVE_TOP:
+ case BELOW_BOTTOM:
+ minSize.width = Math.max(minSize.width, titleWidth);
+ break;
+ case BELOW_TOP:
+ case ABOVE_BOTTOM:
+ case TOP:
+ case BOTTOM:
+ case DEFAULT_POSITION:
+ default:
+ minSize.width += titleWidth;
+ }
+ return minSize;
}
return new Font("Dialog", Font.PLAIN, 12);
}
-
- /**
- * Returns the horizontal alignment of the title text in relation to
- * the border, mapping the component-dependent alignment constants
- * {@link #LEADING}, {@link #TRAILING} and {@link #DEFAULT_JUSTIFICATION}
- * to the correct value according to the embedded component’s
- * orientation.
- *
- * @param c the Component for which this TitledBorder is the border.
- *
- * @return one of the values {@link #LEFT}, {@link #CENTER}, or {@link
- * #RIGHT}.
- */
- private int getRealTitleJustification(Component c)
- {
- switch (titleJustification)
- {
- case DEFAULT_JUSTIFICATION:
- case LEADING:
- if ((c == null) || c.getComponentOrientation().isLeftToRight())
- return LEFT;
- else
- return RIGHT;
-
- case TRAILING:
- if ((c == null) || c.getComponentOrientation().isLeftToRight())
- return RIGHT;
- else
- return LEFT;
-
- default:
- return titleJustification;
- }
- }
-
-
- /**
- * Performs various measurements for the current state of this TitledBorder
- * and the given Component.
- *
- * @param c the component (<code>null</code> not permitted).
- *
- * @return Various measurements.
- */
- private Measurements getMeasurements(Component c)
- {
- Measurements m = new Measurements();
- FontMetrics fmet;
-
- m.font = getFont(c);
- fmet = c.getFontMetrics(m.font);
- m.border = getBorder();
- if (m.border != null)
- m.borderInsets = m.border.getBorderInsets(c);
- else
- m.borderInsets = new Insets(0, 0, 0, 0);
-
- if (title != null)
- {
- m.trimmedText = title.trim();
- if (m.trimmedText.length() == 0)
- m.trimmedText = null;
- }
-
- if (m.trimmedText != null)
- {
- m.textAscent = fmet.getAscent();
- m.textDescent = fmet.getDescent() + fmet.getLeading();
-
- FontRenderContext frc = new FontRenderContext(new AffineTransform(),
- false, false);
- LineMetrics lmet = m.font.getLineMetrics(m.trimmedText, 0,
- m.trimmedText.length(), frc);
- m.lineHeight = (int) lmet.getStrikethroughOffset();
-
- // Fallback in case that LineMetrics is not available/working.
- if (m.lineHeight == 0)
- m.lineHeight = (int) (0.3333 * (double) m.textAscent);
- m.textWidth = fmet.stringWidth(m.trimmedText) + 3;
- }
- else
- {
- m.textAscent = 0;
- m.textDescent = 0;
- }
-
- m.innerSpacing = new Insets(EDGE_SPACING, EDGE_SPACING, EDGE_SPACING,
- EDGE_SPACING);
- m.outerSpacing = new Insets(EDGE_SPACING, EDGE_SPACING, EDGE_SPACING,
- EDGE_SPACING);
-
- switch (titlePosition)
- {
- case ABOVE_TOP:
- m.outerSpacing.top += m.textAscent + m.textDescent + TEXT_SPACING;
- break;
-
- case TOP:
- m.outerSpacing.top += m.textDescent + m.lineHeight;
- m.innerSpacing.top += m.textAscent - m.lineHeight;
- break;
-
- case BELOW_TOP:
- m.innerSpacing.top += m.textAscent + m.textDescent + TEXT_SPACING;
- break;
-
- case ABOVE_BOTTOM:
- m.innerSpacing.bottom += m.textAscent + m.textDescent + TEXT_SPACING;
- break;
-
- case BOTTOM:
- m.innerSpacing.bottom += Math.max(m.textAscent - m.lineHeight, 0);
- m.outerSpacing.bottom += m.textDescent + m.lineHeight;
- break;
-
- case BELOW_BOTTOM:
- m.outerSpacing.bottom += m.textAscent + m.textDescent;
- break;
-
- default:
- m.outerSpacing.top += m.textAscent;
- }
-
- return m;
- }
-
-
- /**
- * A private helper class for holding the result of measuring the
- * distances of a TitledBorder. While it would be possible to cache
- * these objects, it does not seem to be worth the effort. Note that
- * invalidating the cache would be tricky, especially since there is
- * no notification mechanism that would inform the cache when
- * border has changed, so it would return different insets.
- */
- private static class Measurements
- {
- /**
- * The font used for displaying the title text. Note that it can
- * well be that the TitledBorder’s font is <code>null</code>,
- * which means that the font is to be retrieved from the current
- * LookAndFeel. In this case, this <code>font</code> field will
- * contain the result of the retrieval. Therefore, it is safe
- * to assume that this <code>font</code> field will never have
- * a <code>null</code> value.
- */
- Font font;
-
-
- /**
- * The number of pixels between the base line and the top of the
- * text box.
- */
- int textAscent;
-
-
- /**
- * The number of pixels between the base line and the bottom of
- * the text box.
- */
- int textDescent;
-
- /**
- * The number of pixels between the base line and the height where
- * a strike-through would be drawn.
- */
- int lineHeight;
-
- /**
- * The title text after removing leading and trailing white space
- * characters. If the title consists only of white space, the
- * value of <code>trimmedText</code> will be <code>null</code>.
- */
- String trimmedText;
-
-
- /**
- * The width of the trimmed title text in pixels.
- */
- int textWidth;
-
-
- /**
- * The border that constitutes the interior border
- * underneath the title text.
- */
- Border border;
-
-
- /**
- * The distance between the TitledBorder and the interior border.
- */
- Insets outerSpacing;
-
- /**
- * The width of the interior border, as returned by
- * <code>border.getBorderInsets()</code>.
- */
- Insets borderInsets;
-
-
- /**
- * The distance between the interior border and the nested
- * Component for which this TitledBorder is a border.
- */
- Insets innerSpacing;
-
-
- /**
- * Determines the insets of the nested component when it has a
- * TitledBorder as its border. Used by {@link
- * TitledBorder#getBorderInsets(Component, Insets)}.
- *
- * @param i an Insets object for storing the results into, or
- * <code>null</code> to cause the creation of a
- * new instance.
- *
- * @return the <code>i</code> object, or a new Insets object
- * if <code>null</code> was passed for <code>i</code>.
- */
- public Insets getContentInsets(Insets i)
- {
- if (i == null)
- i = new Insets(0, 0, 0, 0);
- i.left = outerSpacing.left + borderInsets.left + innerSpacing.left;
- i.right = outerSpacing.right + borderInsets.right + innerSpacing.right;
- i.top = outerSpacing.top + borderInsets.top + innerSpacing.top;
- i.bottom = outerSpacing.bottom + borderInsets.bottom + innerSpacing.bottom;
- return i;
- }
-
-
- /**
- * Calculates the minimum size needed for displaying the border
- * and its title. Used by {@link TitledBorder#getMinimumSize(Component)}.
- *
- * @return The minimum size.
- */
- public Dimension getMinimumSize()
- {
- int width;
- Insets insets;
-
- insets = getContentInsets(null);
- width = Math.max(insets.left + insets.right, textWidth + 2
- * TEXT_INSET_H);
- return new Dimension(width, insets.top + insets.bottom);
- }
- }
}
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