basicprogressbarui.java

来自「java jdk 1.4的源码」· Java 代码 · 共 1,340 行 · 第 1/4 页

        }
    }

    /**
     * Stores the position and size of
     * the bouncing box that would be painted for the current animation index
     * in <code>r</code> and returns <code>r</code>.
     * Subclasses that add to the painting performed
     * in this class's implementation of <code>paintIndeterminate</code> --
     * to draw an outline around the bouncing box, for example --
     * can use this method to get the location of the bouncing
     * box that was just painted.
     * By overriding this method,
     * you have complete control over the size and position 
     * of the bouncing box,
     * without having to reimplement <code>paintIndeterminate</code>.
     *
     * @param r  the Rectangle instance to be modified;
     *           may be <code>null</code>
     * @return   <code>null</code> if no box should be drawn;
     *           otherwise, returns the passed-in rectangle
     *           (if non-null)
     *           or a new rectangle
     *
     * @see #setAnimationIndex
     * @since 1.4
     */
    protected Rectangle getBox(Rectangle r) {
        int currentFrame = getAnimationIndex();
        int middleFrame = numFrames/2;

        if (DEBUGALL) {
            System.out.println("----begin getBox----");
            System.out.println("    getBox argument: " + r);
            System.out.println("    currentFrame = " + currentFrame);
            System.out.println("    middleFrame = " + middleFrame);
        }

        if (sizeChanged() || delta == 0.0 || maxPosition == 0.0) {
            updateSizes();
        }

        r = getGenericBox(r); 

        if (r == null) {
            if (DEBUGALL) {
                System.out.println("    Exiting because r is null");
            }
            return null;
        }
        if (middleFrame <= 0) {
            if (DEBUGALL) {
                System.out.println("    Exiting because middleFrame <= 0.");
            }
            return null;
        }

        //assert currentFrame >= 0 && currentFrame < numFrames
        if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
            if (currentFrame < middleFrame) {
                r.x = componentInnards.x
                      + (int)Math.round(delta * (double)currentFrame);
            } else {
                r.x = maxPosition
                      - (int)Math.round(delta * 
                                        (currentFrame - middleFrame));
            }
        } else { //VERTICAL indeterminate progress bar
            if (currentFrame < middleFrame) {
                r.y = componentInnards.y
                      + (int)Math.round(delta * currentFrame);
            } else {
                r.y = maxPosition
                      - (int)Math.round(delta *
                                        (currentFrame - middleFrame));
            }
        }

        if (DEBUGALL) {
            System.out.println("    getBox return value: " + r);
            System.out.println("----end getBox----");
        }
        return r;
    }

    /**
     * Updates delta, max position.
     * Assumes componentInnards is correct (e.g. call after sizeChanged()).
     */
    private void updateSizes() {
        if (DEBUGALL) {
            System.out.println("----begin updateSizes----");
        }

        int length = 0;

        if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
            length = getBoxLength(componentInnards.width,
                                  componentInnards.height);
            maxPosition = componentInnards.x + componentInnards.width
                          - length;

        } else { //VERTICAL progress bar
            length = getBoxLength(componentInnards.height,
                                  componentInnards.width);
            maxPosition = componentInnards.y + componentInnards.height
                          - length;
        }

        //If we're doing bouncing-box animation, update delta.
        if (DEBUGALL) {
            System.out.println("    Updating delta.");
        }

        delta = 2.0 * (double)maxPosition/(double)numFrames;

        if (BASICDEBUG) {
            System.out.println("    delta: " + delta);
            System.out.println("    maxPosition: " + maxPosition);
        }
        if (DEBUGALL) {
            System.out.println("----end updateSizes----");
        }

        return; 
    }

    /**
     * Assumes that the component innards, max position, etc. are up-to-date.
     */
    private Rectangle getGenericBox(Rectangle r) {
        if (DEBUGALL) {
            System.out.println("----begin getGenericBox----");
            System.out.println("    argument: " + r);
        }

        if (r == null) {
            r = new Rectangle();
        }

        if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
            r.width = getBoxLength(componentInnards.width,
                                   componentInnards.height);
            if (r.width < 0) {
                r = null;
            } else {
                r.height = componentInnards.height;
                r.y = componentInnards.y;
            }
          // end of HORIZONTAL

        } else { //VERTICAL progress bar
            r.height = getBoxLength(componentInnards.height,
                                    componentInnards.width);
            if (r.height < 0) {
                r = null;
            } else {
                r.width = componentInnards.width;
                r.x = componentInnards.x;
            }
        } // end of VERTICAL

        if (DEBUGALL) {
            System.out.println("    getGenericBox returns: " + r);
            System.out.println("----end getGenericBox----");
        }
        return r;
    }

    /**
     * Returns the length
     * of the "bouncing box" to be painted.
     * This method is invoked by the 
     * default implementation of <code>paintIndeterminate</code>
     * to get the width (if the progress bar is horizontal)
     * or height (if vertical) of the box.
     * For example:
     * <blockquote>
     * <pre>
     *boxRect.width = getBoxLength(componentInnards.width,
     *                             componentInnards.height);
     * </pre>
     * </blockquote>
     *
     * <p>
     * By default, this method returns the available length
     * divided by 6.  Another possibility might
     * be to make the bouncing box a square, 
     * which you could implement by overriding this method as follows:
     * <blockquote>
     * <pre>
     *protected double getBoxLength(int availableLength,
     *                              int otherDimension) {
     *    return Math.min(availableLength, otherDimension);
     *}
     * </blockquote>
     * </pre>
     *
     * @param availableLength  the amount of space available
     *                         for the bouncing box to move in;
     *                         for a horizontal progress bar,
     *                         for example,
     *                         this should be
     *                         the inside width of the progress bar
     *                         (the component width minus borders)
     * @param otherDimension   for a horizontal progress bar, this should be
     *                         the inside height of the progress bar; this
     *                         value might be used to constrain or determine
     *                         the return value 
     *
     * @return the size of the box dimension being determined; 
     *         must be no larger than <code>availableLength</code>
     *
     * @see javax.swing.SwingUtilities#calculateInnerArea
     * @since 1.4
     */
    private int getBoxLength(int availableLength, int otherDimension) {
        return (int)Math.round(availableLength/6.0);
    }

    /**
     * All purpose paint method that should do the right thing for all
     * linear bouncing-box progress bars. 
     * Override this if you are making another kind of 
     * progress bar.
     *
     * @see #paintDeterminate
     *
     * @since 1.4
     */
    protected void paintIndeterminate(Graphics g, JComponent c) {
        if (!(g instanceof Graphics2D)) {
            return;
        }

	Insets b = progressBar.getInsets(); // area for border
	int barRectWidth = progressBar.getWidth() - (b.right + b.left);
	int barRectHeight = progressBar.getHeight() - (b.top + b.bottom);

        Graphics2D g2 = (Graphics2D)g;
        if (DEBUGALL) {
            System.out.println();
            System.out.println("basic: paintIndeterminate");
        }

        // Paint the bouncing box.
        boxRect = getBox(boxRect);
        if (boxRect != null) {
            g2.setColor(progressBar.getForeground());
            g2.fillRect(boxRect.x, boxRect.y,
                       boxRect.width, boxRect.height);
        } else if (DEBUGALL) {
            //we're not initialized yet
            System.out.println("boxRect == null; returning");
        }

	// Deal with possible text painting
	if (progressBar.isStringPainted()) {
            if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
                paintString(g2, b.left, b.top,
                            barRectWidth, barRectHeight,
                            boxRect.x, boxRect.width, b);
            }
            else {
                paintString(g2, b.left, b.top,
                            barRectWidth, barRectHeight,
                            boxRect.y, boxRect.height, b);
            }
        }
    }


    /**
     * All purpose paint method that should do the right thing for almost
     * all linear, determinate progress bars. By setting a few values in
     * the defaults
     * table, things should work just fine to paint your progress bar.
     * Naturally, override this if you are making a circular or
     * semi-circular progress bar.
     * 
     * @see #paintIndeterminate
     *
     * @since 1.4
     */
    protected void paintDeterminate(Graphics g, JComponent c) {
        if (!(g instanceof Graphics2D)) {
            return;
        }

	Insets b = progressBar.getInsets(); // area for border
	int barRectWidth = progressBar.getWidth() - (b.right + b.left);
	int barRectHeight = progressBar.getHeight() - (b.top + b.bottom);

        int cellLength = getCellLength();
        int cellSpacing = getCellSpacing();
	// amount of progress to draw
	int amountFull = getAmountFull(b, barRectWidth, barRectHeight);
	
        Graphics2D g2 = (Graphics2D)g;
	g2.setColor(progressBar.getForeground());

	if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
	    // draw the cells
	    if (cellSpacing == 0 && amountFull > 0) {
                // draw one big Rect because there is no space between cells
                g2.setStroke(new BasicStroke((float)barRectHeight,
                        BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
	    } else {
                // draw each individual cell
                g2.setStroke(new BasicStroke((float)barRectHeight,
                        BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL,
                        0.f, new float[] { cellLength, cellSpacing }, 0.f));
            }

            if (BasicGraphicsUtils.isLeftToRight(c)) {
                g2.drawLine(b.left, (barRectHeight/2) + b.top,
                        amountFull + b.left, (barRectHeight/2) + b.top);
            } else {
                g2.drawLine((barRectWidth + b.left),
                        (barRectHeight/2) + b.top,
                        barRectWidth + b.left - amountFull,
                        (barRectHeight/2) + b.top);
            }
            
	} else { // VERTICAL
	    // draw the cells
	    if (cellSpacing == 0 && amountFull > 0) {
                // draw one big Rect because there is no space between cells
                g2.setStroke(new BasicStroke((float)barRectWidth,
                        BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
	    } else {
                // draw each individual cell
                g2.setStroke(new BasicStroke((float)barRectWidth,
                        BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL,
                        0f, new float[] { cellLength, cellSpacing }, 0f));