basicsliderui.java

java jdk 1.4的源码

    protected void calculateTrackBuffer() {
        if ( slider.getPaintLabels() && slider.getLabelTable()  != null ) {
            Component highLabel = getHighestValueLabel();
            Component lowLabel = getLowestValueLabel();

            if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
                trackBuffer = Math.max( highLabel.getBounds().width, lowLabel.getBounds().width ) / 2;
                trackBuffer = Math.max( trackBuffer, thumbRect.width / 2 );
            }
            else {
                trackBuffer = Math.max( highLabel.getBounds().height, lowLabel.getBounds().height ) / 2;
                trackBuffer = Math.max( trackBuffer, thumbRect.height / 2 );
            }
        }
        else {
            if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
                trackBuffer = thumbRect.width / 2;
            }
            else {
                trackBuffer = thumbRect.height / 2;
            }
        }
    }

  
    protected void calculateTrackRect() {
	int centerSpacing = 0; // used to center sliders added using BorderLayout.CENTER (bug 4275631)
        if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
	    centerSpacing = thumbRect.height;
	    if ( slider.getPaintTicks() ) centerSpacing += getTickLength();
	    if ( slider.getPaintLabels() ) centerSpacing += getHeightOfTallestLabel();
	    trackRect.x = contentRect.x + trackBuffer;
	    trackRect.y = contentRect.y + (contentRect.height - centerSpacing - 1)/2;
	    trackRect.width = contentRect.width - (trackBuffer * 2);
	    trackRect.height = thumbRect.height;
	}
	else {
	    centerSpacing = thumbRect.width;
	    if (BasicGraphicsUtils.isLeftToRight(slider)) {
		if ( slider.getPaintTicks() ) centerSpacing += getTickLength();
	    	if ( slider.getPaintLabels() ) centerSpacing += getWidthOfWidestLabel();
	    } else {
	        if ( slider.getPaintTicks() ) centerSpacing -= getTickLength();
	    	if ( slider.getPaintLabels() ) centerSpacing -= getWidthOfWidestLabel();
	    }
	    trackRect.x = contentRect.x + (contentRect.width - centerSpacing - 1)/2;
	    trackRect.y = contentRect.y + trackBuffer;
	    trackRect.width = thumbRect.width;
	    trackRect.height = contentRect.height - (trackBuffer * 2);
	}

    }

    /**
     * Gets the height of the tick area for horizontal sliders and the width of the
     * tick area for vertical sliders.  BasicSliderUI uses the returned value to
     * determine the tick area rectangle.  If you want to give your ticks some room,
     * make this larger than you need and paint your ticks away from the sides in paintTicks().
     */
    protected int getTickLength() {
        return 8;
    }

    protected void calculateTickRect() {
	if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
	    tickRect.x = trackRect.x;
	    tickRect.y = trackRect.y + trackRect.height;
	    tickRect.width = trackRect.width;
	    tickRect.height = getTickLength();
	    
	    if ( !slider.getPaintTicks() ) {
	        --tickRect.y;
		tickRect.height = 0;
	    }
	}
	else {
	    if(BasicGraphicsUtils.isLeftToRight(slider)) {
	        tickRect.x = trackRect.x + trackRect.width;
		tickRect.width = getTickLength();
	    }
	    else {
	        tickRect.width = getTickLength();
	        tickRect.x = trackRect.x - tickRect.width;
	    }
	    tickRect.y = trackRect.y;
	    tickRect.height = trackRect.height;

	    if ( !slider.getPaintTicks() ) {
	        --tickRect.x;
		tickRect.width = 0;
	    }
	}
    }

    protected void calculateLabelRect() {
        if ( slider.getPaintLabels() ) {
	    if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
	        labelRect.x = tickRect.x - trackBuffer;
		labelRect.y = tickRect.y + tickRect.height;
		labelRect.width = tickRect.width + (trackBuffer * 2);
                labelRect.height = getHeightOfTallestLabel();
            }
            else {
	        if(BasicGraphicsUtils.isLeftToRight(slider)) {
		    labelRect.x = tickRect.x + tickRect.width;
		    labelRect.width = getWidthOfWidestLabel();
		}
		else {
		    labelRect.width = getWidthOfWidestLabel();
		    labelRect.x = tickRect.x - labelRect.width;
		}
		labelRect.y = tickRect.y - trackBuffer;
		labelRect.height = tickRect.height + (trackBuffer * 2);
            }
        }
        else {
            if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
	        labelRect.x = tickRect.x;
		labelRect.y = tickRect.y + tickRect.height;
		labelRect.width = tickRect.width;
		labelRect.height = 0;
            }
            else {
	        if(BasicGraphicsUtils.isLeftToRight(slider)) {
		    labelRect.x = tickRect.x + tickRect.width;
		}
		else {
		    labelRect.x = tickRect.x;
		}
		labelRect.y = tickRect.y;
		labelRect.width = 0;
		labelRect.height = tickRect.height;
            }
        }
    }

    protected Dimension getThumbSize() {
        Dimension size = new Dimension();

        if ( slider.getOrientation() == JSlider.VERTICAL ) {
	    size.width = 20;
	    size.height = 11;
	}
	else {
	    size.width = 11;
	    size.height = 20;
	}

	return size;
    }

    public class PropertyChangeHandler implements PropertyChangeListener {
        public void propertyChange( PropertyChangeEvent e ) {
	    String propertyName = e.getPropertyName();
             if (propertyName.equals( "orientation" ) ||
                 propertyName.equals( "inverted" ) ||
		 propertyName.equals( "labelTable" )  ||
		 propertyName.equals( "majorTickSpacing" )  ||
		 propertyName.equals( "minorTickSpacing" )  ||
		 propertyName.equals( "paintTicks" )  ||
		 propertyName.equals( "paintTrack" )  ||
		 propertyName.equals( "paintLabels" ) ) {
	      
	        calculateGeometry();
                slider.repaint();
	    }
	    else if (propertyName.equals( "componentOrientation" )) {
		calculateGeometry();
		slider.repaint();

		InputMap km = getInputMap(JComponent.WHEN_FOCUSED);
		SwingUtilities.replaceUIInputMap(slider,
						 JComponent.WHEN_FOCUSED, km);
	    }
	    else if ( propertyName.equals( "model" ) ) {
	        ((BoundedRangeModel)e.getOldValue()).removeChangeListener( changeListener );
		((BoundedRangeModel)e.getNewValue()).addChangeListener( changeListener );
	        calculateThumbLocation();
		slider.repaint();
	    }
	}
    }

    protected int getWidthOfWidestLabel() {
        Dictionary dictionary = slider.getLabelTable();
        int widest = 0;
        if ( dictionary != null ) {
            Enumeration keys = dictionary.keys();
            while ( keys.hasMoreElements() ) {
                Component label = (Component)dictionary.get( keys.nextElement() );
                widest = Math.max( label.getPreferredSize().width, widest );
            }
        }
        return widest;
    }

    protected int getHeightOfTallestLabel() {
        Dictionary dictionary = slider.getLabelTable();
        int tallest = 0;
        if ( dictionary != null ) {
            Enumeration keys = dictionary.keys();
            while ( keys.hasMoreElements() ) {
                Component label = (Component)dictionary.get( keys.nextElement() );
                tallest = Math.max( label.getPreferredSize().height, tallest );
            }
        }
        return tallest;
    }

    protected int getWidthOfHighValueLabel() {
        Component label = getHighestValueLabel();
        int width = 0;

        if ( label != null ) {
            width = label.getPreferredSize().width;
        }

        return width;
    }

    protected int getWidthOfLowValueLabel() {
        Component label = getLowestValueLabel();
        int width = 0;

        if ( label != null ) {
            width = label.getPreferredSize().width;
        }

        return width;
    }

    protected int getHeightOfHighValueLabel() {
        Component label = getHighestValueLabel();
        int height = 0;

        if ( label != null ) {
            height = label.getPreferredSize().height;
        }

        return height;
    }

    protected int getHeightOfLowValueLabel() {
        Component label = getLowestValueLabel();
        int height = 0;

        if ( label != null ) {
            height = label.getPreferredSize().height;
        }

        return height;
    }

    protected boolean drawInverted() {
        if (slider.getOrientation()==JSlider.HORIZONTAL) {
	    if(BasicGraphicsUtils.isLeftToRight(slider)) {
	        return slider.getInverted();
	    } else {
	        return !slider.getInverted();
	    }
	} else {
	    return slider.getInverted();
	}
    }

    /**
     * Returns the label that corresponds to the highest slider value in the label table.
     * @see JSlider#setLabelTable
     */
    protected Component getLowestValueLabel() {
        Dictionary dictionary = slider.getLabelTable();
        Component label = null;

        if ( dictionary != null ) {
            Enumeration keys = dictionary.keys();
            if ( keys.hasMoreElements() ) {
                int lowestValue = ((Integer)keys.nextElement()).intValue();

                while ( keys.hasMoreElements() ) {
                    int value = ((Integer)keys.nextElement()).intValue();
                    lowestValue = Math.min( value, lowestValue );
                }

                label = (Component)dictionary.get( new Integer( lowestValue ) );
            }
        }

        return label;
    }

    /**
     * Returns the label that corresponds to the lowest slider value in the label table.
     * @see JSlider#setLabelTable
     */
    protected Component getHighestValueLabel() {
        Dictionary dictionary = slider.getLabelTable();
        Component label = null;

        if ( dictionary != null ) {
            Enumeration keys = dictionary.keys();
            if ( keys.hasMoreElements() ) {
                int highestValue = ((Integer)keys.nextElement()).intValue();

                while ( keys.hasMoreElements() ) {
                    int value = ((Integer)keys.nextElement()).intValue();
                    highestValue = Math.max( value, highestValue );
                }

                label = (Component)dictionary.get( new Integer( highestValue ) );
            }
        }

        return label;
    }

    public void paint( Graphics g, JComponent c )   {
        recalculateIfInsetsChanged();
	recalculateIfOrientationChanged();
	Rectangle clip = g.getClipBounds();

	if ( !clip.intersects(trackRect) && slider.getPaintTrack())
	    calculateGeometry();

	if ( slider.getPaintTrack() && clip.intersects( trackRect ) ) {
	    paintTrack( g );
	}
        if ( slider.getPaintTicks() && clip.intersects( tickRect ) ) {
            paintTicks( g );
        }
        if ( slider.getPaintLabels() && clip.intersects( labelRect ) ) {
            paintLabels( g );
        }
	if ( slider.hasFocus() && clip.intersects( focusRect ) ) {
	    paintFocus( g );      
	}
	if ( clip.intersects( thumbRect ) ) {
	    paintThumb( g );
	}
    }

    protected void recalculateIfInsetsChanged() {
        Insets newInsets = slider.getInsets();
        if ( !newInsets.equals( insetCache ) ) {
	    insetCache = newInsets;
	    calculateGeometry();
	}
    }

    protected void recalculateIfOrientationChanged() {
        boolean ltr = BasicGraphicsUtils.isLeftToRight(slider);
        if ( ltr!=leftToRightCache ) {
	    leftToRightCache = ltr;
	    calculateGeometry();
	}
    }

    public void paintFocus(Graphics g)  {        
	g.setColor( getFocusColor() );

	BasicGraphicsUtils.drawDashedRect( g, focusRect.x, focusRect.y,
					   focusRect.width, focusRect.height );
    }

    public void paintTrack(Graphics g)  {        
        int cx, cy, cw, ch;
        int pad;

        Rectangle trackBounds = trackRect;

        if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
            pad = trackBuffer;
            cx = pad;
            cy = (trackBounds.height / 2) - 2;
            cw = trackBounds.width;

            g.translate(trackBounds.x, trackBounds.y + cy);

            g.setColor(getShadowColor());
            g.drawLine(0, 0, cw - 1, 0);
            g.drawLine(0, 1, 0, 2);
            g.setColor(getHighlightColor());
            g.drawLine(0, 3, cw, 3);
            g.drawLine(cw, 0, cw, 3);
            g.setColor(Color.black);
            g.drawLine(1, 1, cw-2, 1);

            g.translate(-trackBounds.x, -(trackBounds.y + cy));
        }
        else {
            pad = trackBuffer;
            cx = (trackBounds.width / 2) - 2;
            cy = pad;
            ch = trackBounds.height;

            g.translate(trackBounds.x + cx, trackBounds.y);

            g.setColor(getShadowColor());
            g.drawLine(0, 0, 0, ch - 1);
            g.drawLine(1, 0, 2, 0);
            g.setColor(getHighlightColor());
            g.drawLine(3, 0, 3, ch);
            g.drawLine(0, ch, 3, ch);
            g.setColor(Color.black);
            g.drawLine(1, 1, 1, ch-2);

            g.translate(-(trackBounds.x + cx), -trackBounds.y);
        }
    }

    public void paintTicks(Graphics g)  {        
        Rectangle tickBounds = tickRect;
        int i;
        int maj, min, max;
        int w = tickBounds.width;
        int h = tickBounds.height;
        int centerEffect, tickHeight;

        g.setColor(slider.getBackground());
        g.fillRect(tickBounds.x, tickBounds.y, tickBounds.width, tickBounds.height);  
        g.setColor(Color.black);