basicscrollbarui.java

JAVA 所有包

     * @see #getMinimumSize
     */
    public Dimension getPreferredSize(JComponent c) {
	return (scrollbar.getOrientation() == JScrollBar.VERTICAL)
	    ? new Dimension(scrollBarWidth, 48)
	    : new Dimension(48, scrollBarWidth);
    }


    /**
     * @param c The JScrollBar that's delegating this method to us.
     * @return new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);
     * @see #getMinimumSize
     * @see #getPreferredSize
     */
    public Dimension getMaximumSize(JComponent c) {
        return new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);
    }
    	    
    protected JButton createDecreaseButton(int orientation)  {
        return new BasicArrowButton(orientation, 
				    UIManager.getColor("ScrollBar.thumb"),
				    UIManager.getColor("ScrollBar.thumbShadow"),
				    UIManager.getColor("ScrollBar.thumbDarkShadow"),
				    UIManager.getColor("ScrollBar.thumbHighlight"));
    }

    protected JButton createIncreaseButton(int orientation)  {
        return new BasicArrowButton(orientation,
				    UIManager.getColor("ScrollBar.thumb"),
				    UIManager.getColor("ScrollBar.thumbShadow"),
				    UIManager.getColor("ScrollBar.thumbDarkShadow"),
				    UIManager.getColor("ScrollBar.thumbHighlight"));
    }
          		  

    protected void paintDecreaseHighlight(Graphics g)
    {
	Insets insets = scrollbar.getInsets();
	Rectangle thumbR = getThumbBounds();
	g.setColor(trackHighlightColor);

	if (scrollbar.getOrientation() == JScrollBar.VERTICAL) {
	    int x = insets.left;
	    int y = decrButton.getY() + decrButton.getHeight();
	    int w = scrollbar.getWidth() - (insets.left + insets.right);
	    int h = thumbR.y - y;
	    g.fillRect(x, y, w, h);
	} 
	else	{
	    int x, w;
	    if (scrollbar.getComponentOrientation().isLeftToRight()) {
		x = decrButton.getX() + decrButton.getWidth();
		w = thumbR.x - x;
	    } else {
		x = thumbR.x + thumbR.width;
		w = decrButton.getX() - x;
	    }
	    int y = insets.top;
	    int h = scrollbar.getHeight() - (insets.top + insets.bottom);
	    g.fillRect(x, y, w, h);
	}
    }      
	

    protected void paintIncreaseHighlight(Graphics g)
    {
	Insets insets = scrollbar.getInsets();
	Rectangle thumbR = getThumbBounds();
	g.setColor(trackHighlightColor);

	if (scrollbar.getOrientation() == JScrollBar.VERTICAL) {
	    int x = insets.left;
	    int y = thumbR.y + thumbR.height;
	    int w = scrollbar.getWidth() - (insets.left + insets.right);
	    int h = incrButton.getY() - y;
	    g.fillRect(x, y, w, h);
	} 
	else {
	    int x, w;
	    if (scrollbar.getComponentOrientation().isLeftToRight()) {
		x = thumbR.x + thumbR.width;
		w = incrButton.getX() - x;
	    } else {
		x = incrButton.getX() + incrButton.getWidth();
		w = thumbR.x - x;
	    }
	    int y = insets.top;
	    int h = scrollbar.getHeight() - (insets.top + insets.bottom);
	    g.fillRect(x, y, w, h);
	}
    }      


    protected void paintTrack(Graphics g, JComponent c, Rectangle trackBounds)  
    {
        g.setColor(trackColor);
        g.fillRect(trackBounds.x, trackBounds.y, trackBounds.width, trackBounds.height);	

	if(trackHighlight == DECREASE_HIGHLIGHT)	{
	    paintDecreaseHighlight(g);
	} 
	else if(trackHighlight == INCREASE_HIGHLIGHT)		{
	    paintIncreaseHighlight(g);
	}
    }

	
    protected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds)  
    {
	if(thumbBounds.isEmpty() || !scrollbar.isEnabled())	{
	    return;
	}

        int w = thumbBounds.width;
        int h = thumbBounds.height;		

	g.translate(thumbBounds.x, thumbBounds.y);

	g.setColor(thumbDarkShadowColor);
	g.drawRect(0, 0, w-1, h-1);    
	g.setColor(thumbColor);
	g.fillRect(0, 0, w-1, h-1);
        
        g.setColor(thumbHighlightColor);
        g.drawLine(1, 1, 1, h-2);
        g.drawLine(2, 1, w-3, 1);
        
        g.setColor(thumbLightShadowColor);
        g.drawLine(2, h-2, w-2, h-2);
        g.drawLine(w-2, 1, w-2, h-3);

	g.translate(-thumbBounds.x, -thumbBounds.y);
    }


    /** 
     * Return the smallest acceptable size for the thumb.  If the scrollbar
     * becomes so small that this size isn't available, the thumb will be
     * hidden.  
     * <p>
     * <b>Warning </b>: the value returned by this method should not be
     * be modified, it's a shared static constant.
     *
     * @return The smallest acceptable size for the thumb.
     * @see #getMaximumThumbSize
     */
    protected Dimension getMinimumThumbSize() { 
	return minimumThumbSize;
    }

    /** 
     * Return the largest acceptable size for the thumb.  To create a fixed 
     * size thumb one make this method and <code>getMinimumThumbSize</code> 
     * return the same value.
     * <p>
     * <b>Warning </b>: the value returned by this method should not be
     * be modified, it's a shared static constant.
     *
     * @return The largest acceptable size for the thumb.
     * @see #getMinimumThumbSize
     */
    protected Dimension getMaximumThumbSize()	{ 
	return maximumThumbSize;
    }


    /*
     * LayoutManager Implementation
     */

    public void addLayoutComponent(String name, Component child) {}
    public void removeLayoutComponent(Component child) {}
    
    public Dimension preferredLayoutSize(Container scrollbarContainer)  {
        return getPreferredSize((JComponent)scrollbarContainer);
    }
    
    public Dimension minimumLayoutSize(Container scrollbarContainer) {
        return getMinimumSize((JComponent)scrollbarContainer);
    }
    
    private int getValue(JScrollBar sb) {
	return (useCachedValue) ? scrollBarValue : sb.getValue();
    }

    protected void layoutVScrollbar(JScrollBar sb)  
    {
        Dimension sbSize = sb.getSize();
        Insets sbInsets = sb.getInsets();

	/*
	 * Width and left edge of the buttons and thumb.
	 */
	int itemW = sbSize.width - (sbInsets.left + sbInsets.right);
	int itemX = sbInsets.left;
        
        /* Nominal locations of the buttons, assuming their preferred
	 * size will fit.
	 */
        boolean squareButtons = DefaultLookup.getBoolean(
            scrollbar, this, "ScrollBar.squareButtons", false);
        int decrButtonH = squareButtons ? itemW :
                          decrButton.getPreferredSize().height;
        int decrButtonY = sbInsets.top;
        
        int incrButtonH = squareButtons ? itemW :
                          incrButton.getPreferredSize().height;
        int incrButtonY = sbSize.height - (sbInsets.bottom + incrButtonH);
        
        /* The thumb must fit within the height left over after we
	 * subtract the preferredSize of the buttons and the insets.
	 */
        int sbInsetsH = sbInsets.top + sbInsets.bottom;
        int sbButtonsH = decrButtonH + incrButtonH;
        float trackH = sbSize.height - (sbInsetsH + sbButtonsH);
        
        /* Compute the height and origin of the thumb.   The case
	 * where the thumb is at the bottom edge is handled specially 
	 * to avoid numerical problems in computing thumbY.  Enforce
	 * the thumbs min/max dimensions.  If the thumb doesn't
	 * fit in the track (trackH) we'll hide it later.
	 */
	float min = sb.getMinimum();
	float extent = sb.getVisibleAmount();
	float range = sb.getMaximum() - min;
	float value = getValue(sb);

        int thumbH = (range <= 0) 
	    ? getMaximumThumbSize().height : (int)(trackH * (extent / range));
	thumbH = Math.max(thumbH, getMinimumThumbSize().height);
	thumbH = Math.min(thumbH, getMaximumThumbSize().height);
        
	int thumbY = incrButtonY - thumbH;  
	if (value < (sb.getMaximum() - sb.getVisibleAmount())) {
	    float thumbRange = trackH - thumbH;
	    thumbY = (int)(0.5f + (thumbRange * ((value - min) / (range - extent))));
	    thumbY +=  decrButtonY + decrButtonH;
	}

        /* If the buttons don't fit, allocate half of the available 
	 * space to each and move the lower one (incrButton) down.
	 */
        int sbAvailButtonH = (sbSize.height - sbInsetsH);
        if (sbAvailButtonH < sbButtonsH) {
            incrButtonH = decrButtonH = sbAvailButtonH / 2;
            incrButtonY = sbSize.height - (sbInsets.bottom + incrButtonH);
        }
        decrButton.setBounds(itemX, decrButtonY, itemW, decrButtonH);
        incrButton.setBounds(itemX, incrButtonY, itemW, incrButtonH);

	/* Update the trackRect field.
	 */	
	int itrackY = decrButtonY + decrButtonH;
	int itrackH = incrButtonY - itrackY;
	trackRect.setBounds(itemX, itrackY, itemW, itrackH);
	
	/* If the thumb isn't going to fit, zero it's bounds.  Otherwise
	 * make sure it fits between the buttons.  Note that setting the
	 * thumbs bounds will cause a repaint.
	 */
	if(thumbH >= (int)trackH)	{
	    setThumbBounds(0, 0, 0, 0);
	}
	else {
	    if ((thumbY + thumbH) > incrButtonY) {
		thumbY = incrButtonY - thumbH;
	    }
	    if (thumbY  < (decrButtonY + decrButtonH)) {
		thumbY = decrButtonY + decrButtonH + 1;
	    }
	    setThumbBounds(itemX, thumbY, itemW, thumbH);
	}
    }
    

    protected void layoutHScrollbar(JScrollBar sb)  
    {
        Dimension sbSize = sb.getSize();
        Insets sbInsets = sb.getInsets();
        
	/* Height and top edge of the buttons and thumb.
	 */
	int itemH = sbSize.height - (sbInsets.top + sbInsets.bottom);
	int itemY = sbInsets.top;

        boolean ltr = sb.getComponentOrientation().isLeftToRight();

        /* Nominal locations of the buttons, assuming their preferred
	 * size will fit.
	 */
        boolean squareButtons = DefaultLookup.getBoolean(
            scrollbar, this, "ScrollBar.squareButtons", false);
        int leftButtonW = squareButtons ? itemH :
                          decrButton.getPreferredSize().width;
        int rightButtonW = squareButtons ? itemH :
                          incrButton.getPreferredSize().width;
        if (!ltr) {
            int temp = leftButtonW;
            leftButtonW = rightButtonW;
            rightButtonW = temp;
        }
        int leftButtonX = sbInsets.left;        
        int rightButtonX = sbSize.width - (sbInsets.right + rightButtonW);

        /* The thumb must fit within the width left over after we
	 * subtract the preferredSize of the buttons and the insets.
	 */
        int sbInsetsW = sbInsets.left + sbInsets.right;
        int sbButtonsW = leftButtonW + rightButtonW;
        float trackW = sbSize.width - (sbInsetsW + sbButtonsW);
        
        /* Compute the width and origin of the thumb.  Enforce
	 * the thumbs min/max dimensions.  The case where the thumb 
	 * is at the right edge is handled specially to avoid numerical 
	 * problems in computing thumbX.  If the thumb doesn't
	 * fit in the track (trackH) we'll hide it later.
	 */
        float min = sb.getMinimum();
        float max = sb.getMaximum();
        float extent = sb.getVisibleAmount();
        float range = max - min;
        float value = getValue(sb);

        int thumbW = (range <= 0) 
	    ? getMaximumThumbSize().width : (int)(trackW * (extent / range));
        thumbW = Math.max(thumbW, getMinimumThumbSize().width);
        thumbW = Math.min(thumbW, getMaximumThumbSize().width);
        
	int thumbX = ltr ? rightButtonX - thumbW : leftButtonX + leftButtonW;
	if (value < (max - sb.getVisibleAmount())) {
	    float thumbRange = trackW - thumbW;
            if( ltr ) {
                thumbX = (int)(0.5f + (thumbRange * ((value - min) / (range - extent))));
            } else {
                thumbX = (int)(0.5f + (thumbRange * ((max - extent - value) / (range - extent))));
            }
	    thumbX +=  leftButtonX + leftButtonW;
	}

        /* If the buttons don't fit, allocate half of the available 
         * space to each and move the right one over.
         */
        int sbAvailButtonW = (sbSize.width - sbInsetsW);
        if (sbAvailButtonW < sbButtonsW) {
            rightButtonW = leftButtonW = sbAvailButtonW / 2;
            rightButtonX = sbSize.width - (sbInsets.right + rightButtonW);
        }
        
        (ltr ? decrButton : incrButton).setBounds(leftButtonX, itemY, leftButtonW, itemH);
        (ltr ? incrButton : decrButton).setBounds(rightButtonX, itemY, rightButtonW, itemH);

	/* Update the trackRect field.
	 */	
	int itrackX = leftButtonX + leftButtonW;
	int itrackW = rightButtonX - itrackX;
	trackRect.setBounds(itrackX, itemY, itrackW, itemH);

	/* Make sure the thumb fits between the buttons.  Note 
	 * that setting the thumbs bounds causes a repaint.
	 */
	if (thumbW >= (int)trackW) {
	    setThumbBounds(0, 0, 0, 0);
	}
	else {
	    if (thumbX + thumbW > rightButtonX) {
		thumbX = rightButtonX - thumbW;
	    }
	    if (thumbX  < leftButtonX + leftButtonW) {
		thumbX = leftButtonX + leftButtonW + 1;
	    }
	    setThumbBounds(thumbX, itemY, thumbW, itemH);
	}
    }

    public void layoutContainer(Container scrollbarContainer) 
    {
	/* If the user is dragging the value, we'll assume that the 
	 * scrollbars layout is OK modulo the thumb which is being 
	 * handled by the dragging code.
	 */
	if (isDragging) {
	    return;
	}