flowarrangement.java

来自「JfreeChart 常用图表例子」· Java 代码 · 共 449 行 · 第 1/2 页

    
    /**
     * Arranges the blocks in the container with a fixed width and a range
     * constraint on the height.
     * 
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     * 
     * @return The size following the arrangement.
     */
    protected Size2D arrangeFR(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        Size2D s = arrangeFN(container, g2, constraint);
        if (constraint.getHeightRange().contains(s.height)) {
            return s;   
        }
        else {
            RectangleConstraint c = constraint.toFixedHeight(
                constraint.getHeightRange().constrain(s.getHeight())
            );
            return arrangeFF(container, g2, c);
        }
    }

    /**
     * Arranges the blocks in the container with the overall height and width
     * specified as fixed constraints.
     * 
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     * 
     * @return The size following the arrangement.
     */
    protected Size2D arrangeFF(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        // TODO: implement this properly
        return arrangeFN(container, g2, constraint);
    }

    /**
     * Arranges the blocks with the overall width and height to fit within 
     * specified ranges.
     * 
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     * 
     * @return The size after the arrangement.
     */
    protected Size2D arrangeRR(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        // first arrange without constraints, and see if this fits within
        // the required ranges...
        Size2D s1 = arrangeNN(container, g2);
        if (constraint.getWidthRange().contains(s1.width)) {
            return s1;  // TODO: we didn't check the height yet
        }
        else {
            RectangleConstraint c = constraint.toFixedWidth(
                constraint.getWidthRange().getUpperBound()
            );
            return arrangeFR(container, g2, c);
        }
    }
    
    /**
     * Arranges the blocks in the container with a range constraint on the
     * width and a fixed height.
     * 
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     * 
     * @return The size following the arrangement.
     */
    protected Size2D arrangeRF(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        Size2D s = arrangeNF(container, g2, constraint);
        if (constraint.getWidthRange().contains(s.width)) {
            return s;   
        }
        else {
            RectangleConstraint c = constraint.toFixedWidth(
                constraint.getWidthRange().constrain(s.getWidth())
            );
            return arrangeFF(container, g2, c);
        }
    }

    /**
     * Arranges the block with a range constraint on the width, and no 
     * constraint on the height.
     * 
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     * 
     * @return The size following the arrangement.
     */
    protected Size2D arrangeRN(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {
        // first arrange without constraints, then see if the width fits
        // within the required range...if not, call arrangeFN() at max width
        Size2D s1 = arrangeNN(container, g2);
        if (constraint.getWidthRange().contains(s1.width)) {
            return s1;   
        }
        else {
            RectangleConstraint c = constraint.toFixedWidth(
                constraint.getWidthRange().getUpperBound()
            );
            return arrangeFN(container, g2, c);
        }
    }
    
    /**
     * Arranges the blocks without any constraints.  This puts all blocks
     * into a single row.
     * 
     * @param container  the container.
     * @param g2  the graphics device.
     * 
     * @return The size after the arrangement.
     */
    protected Size2D arrangeNN(BlockContainer container, Graphics2D g2) {
        double x = 0.0;
        double width = 0.0;
        double maxHeight = 0.0;
        List blocks = container.getBlocks();
        int blockCount = blocks.size();
        if (blockCount > 0) {
            Size2D[] sizes = new Size2D[blocks.size()];
            for (int i = 0; i < blocks.size(); i++) {
                Block block = (Block) blocks.get(i);
                sizes[i] = block.arrange(g2, RectangleConstraint.NONE);
                width = width + sizes[i].getWidth();
                maxHeight = Math.max(sizes[i].height, maxHeight);
                block.setBounds(
                    new Rectangle2D.Double(
                        x, 0.0, sizes[i].width, sizes[i].height
                    )
                );
                x = x + sizes[i].width + this.horizontalGap;
            }
            if (blockCount > 1) {
                width = width + this.horizontalGap * (blockCount - 1);   
            }
            if (this.verticalAlignment != VerticalAlignment.TOP) {
                for (int i = 0; i < blocks.size(); i++) {
                    Block b = (Block) blocks.get(i);
                    if (this.verticalAlignment == VerticalAlignment.CENTER) {
                        //TODO: shift block down by half
                    }
                    else if (this.verticalAlignment 
                            == VerticalAlignment.BOTTOM) {
                        //TODO: shift block down to bottom
                    }
                }            
            }
        }
        return new Size2D(width, maxHeight);
    }
    
    /**
     * Arranges the blocks with no width constraint and a fixed height 
     * constraint.  This puts all blocks into a single row.
     * 
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     * 
     * @return The size after the arrangement.
     */
    protected Size2D arrangeNF(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {
        // TODO: for now we are ignoring the height constraint
        return arrangeNN(container, g2);
    }
    
    /**
     * Clears any cached information.
     */
    public void clear() {
        // no action required.
    }
    
    /**
     * Tests this instance for equality with an arbitrary object.
     * 
     * @param obj  the object (<code>null</code> permitted).
     * 
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;   
        }
        if (!(obj instanceof FlowArrangement)) {
            return false;   
        }
        FlowArrangement that = (FlowArrangement) obj;
        if (this.horizontalAlignment != that.horizontalAlignment) {
            return false;
        }
        if (this.verticalAlignment != that.verticalAlignment) {
            return false;
        }
        if (this.horizontalGap != that.horizontalGap) {
            return false;   
        }
        if (this.verticalGap != that.verticalGap) {
            return false;   
        }
        return true;
    }
    
}