layoutstyle.java

JMule是一个基于Java开发

                }
                return 6;
            }
            return 6;
        }
        throw new IllegalArgumentException("Invalid type");
    }

    /**
     * Returns the amount of space to position a component inside its
     * parent.
     *
     * @param component the <code>Component</code> being positioned
     * @param position the position <code>component</code> is being placed 
     *        relative to its parent; one of
     *        <code>SwingConstants.NORTH</code>,
     *        <code>SwingConstants.SOUTH</code>,
     *        <code>SwingConstants.EAST</code> or
     *        <code>SwingConstants.WEST</code>
     * @param parent the parent of <code>component</code>; this may differ
     *        from the actual parent and may be null
     * @return the amount of space to place between the component and specified
     *         edge
     * @throws IllegalArgumentException if <code>position</code> is not
     *         one of <code>SwingConstants.NORTH</code>,
     *         <code>SwingConstants.SOUTH</code>,
     *         <code>SwingConstants.EAST</code> or 
     *         <code>SwingConstants.WEST</code>;
     *         or <code>component</code> is null
     */
    public int getContainerGap(JComponent component, int position,
            Container parent) {
        if (position != SwingConstants.NORTH &&
              position != SwingConstants.SOUTH &&
              position != SwingConstants.WEST &&
              position != SwingConstants.EAST) {
            throw new IllegalArgumentException("Invalid position");
        }
        if (component == null) {
            throw new IllegalArgumentException("Component must be non-null");
        }
        return 12;
    }

    /**
     * Returns true if <code>component</code> should be treated as a dialog.
     */
    boolean isDialog(JComponent component) {
        // PENDING: tag the content pane to make this easier to check for
        String name = component.getName();
        return (name != null && name.endsWith(".contentPane"));
    }

    /**
     * For some look and feels check boxs and radio buttons have an empty
     * border around them.  Look and feel guidelines generally don't include
     * this space.  Use this method to subtract this space from the specified
     * components.
     *
     * @param source First component
     * @param target Second component
     * @param position Position doing layout along.
     * @param offset Ideal offset, not including border/margin
     * @return offset - border/margin around the component.
     */
    int getCBRBPadding(JComponent source, JComponent target, int position,
                       int offset) {
        offset -= getCBRBPadding(source, position);
        if (offset > 0) {
            offset -= getCBRBPadding(target, flipDirection(position));
        }
        if (offset < 0) {
            return 0;
        }
        return offset;
    }

    /**
     * For some look and feels check boxs and radio buttons have an empty
     * border around them.  Look and feel guidelines generally don't include
     * this space.  Use this method to subtract this space from the specified
     * components.
     *
     * @param source Component
     * @param position Position doing layout along.
     * @param offset Ideal offset, not including border/margin
     * @return offset - border/margin around the component.
     */
    int getCBRBPadding(JComponent source, int position, int offset) {
        offset -= getCBRBPadding(source, position);
        return Math.max(offset, 0);
    }

    int flipDirection(int position) {
        switch(position) {
        case SwingConstants.NORTH:
            return SwingConstants.SOUTH;
        case SwingConstants.SOUTH:
            return SwingConstants.NORTH;
        case SwingConstants.EAST:
            return SwingConstants.WEST;
        case SwingConstants.WEST:
            return SwingConstants.EAST;
        }
        assert false;
        return 0;
    }

    private int getCBRBPadding(JComponent c, int position) {
        if (c.getUIClassID() == "CheckBoxUI" ||
              c.getUIClassID() == "RadioButtonUI") {
            Border border = c.getBorder();
            if (border instanceof UIResource) {
                return getInset(c, position);
            }
        }
        return 0;
    }

    private int getInset(JComponent c, int position) {
        Insets insets = c.getInsets();
        switch(position) {
        case SwingConstants.NORTH:
            return insets.top;
        case SwingConstants.SOUTH:
            return insets.bottom;
        case SwingConstants.EAST:
            return insets.right;
        case SwingConstants.WEST:
            return insets.left;
        }
        assert false;
        return 0;
    }

    private boolean isLeftAligned(AbstractButton button, int position) {
        if (position == SwingConstants.WEST) {
            boolean ltr = button.getComponentOrientation().isLeftToRight();
            int hAlign = button.getHorizontalAlignment();
            return ((ltr && (hAlign == SwingConstants.LEFT ||
                             hAlign == SwingConstants.LEADING)) ||
                    (!ltr && (hAlign == SwingConstants.TRAILING)));
        }
        return false;
    }

    private boolean isRightAligned(AbstractButton button, int position) {
        if (position == SwingConstants.EAST) {
            boolean ltr = button.getComponentOrientation().isLeftToRight();
            int hAlign = button.getHorizontalAlignment();
            return ((ltr && (hAlign == SwingConstants.RIGHT ||
                             hAlign == SwingConstants.TRAILING)) ||
                    (!ltr && (hAlign == SwingConstants.LEADING)));
        }
        return false;
    }

    private Icon getIcon(AbstractButton button) {
        Icon icon = button.getIcon();
        if (icon != null) {
            return icon;
        }
        String key = null;
        if (button instanceof JCheckBox) {
            key = "CheckBox.icon";
        } else if (button instanceof JRadioButton) {
            key = "RadioButton.icon";
        }
        if (key != null) {
            Object oIcon = UIManager.get(key);
            if (oIcon instanceof Icon) {
                return (Icon)oIcon;
            }
        }
        return null;
    }

    /**
     * Returns the amount to indent the specified component if it's
     * a JCheckBox or JRadioButton.  If the component is not a JCheckBox or
     * JRadioButton, 0 will be returned.
     */
    int getButtonChildIndent(JComponent c, int position) {
        if ((c instanceof JRadioButton) || (c instanceof JCheckBox)) {
            AbstractButton button = (AbstractButton)c;
            Insets insets = c.getInsets();
            Icon icon = getIcon(button);
            int gap = button.getIconTextGap();
            if (isLeftAligned(button, position)) {
                return insets.left + icon.getIconWidth() + gap;
            } else if (isRightAligned(button, position)) {
                return insets.right + icon.getIconWidth() + gap;
            }
        }
        return 0;
    }
}