package com.itmill.toolkit.ui;

import com.itmill.toolkit.terminal.PaintException;
import com.itmill.toolkit.terminal.PaintTarget;
import com.itmill.toolkit.terminal.Sizeable;
import com.itmill.toolkit.terminal.gwt.client.ui.MarginInfo;

/**
 * An abstract class that defines default implementation for the {@link Layout}
 * interface.
 * 
 * @author IT Mill Ltd.
 * @version
 * @VERSION@
 * @since 5.0
 */
public abstract class AbstractLayout extends AbstractComponentContainer
        implements Layout {

    protected MarginInfo margins = new MarginInfo(false, false, false, false);

    /**
     * Height of the layout. Set to -1 for undefined height.
     */
    private int height = -1;

    /**
     * Height unit.
     * 
     * @see com.itmill.toolkit.terminal.Sizeable.UNIT_SYMBOLS;
     */
    private int heightUnit = UNITS_PIXELS;

    /**
     * Width of the layout. Set to -1 for undefined width.
     */
    private int width = -1;

    /**
     * Width unit.
     * 
     * @see com.itmill.toolkit.terminal.Sizeable.UNIT_SYMBOLS;
     */
    private int widthUnit = UNITS_PIXELS;

    /*
     * (non-Javadoc)
     * 
     * @see com.itmill.toolkit.ui.AbstractComponent#getTag()
     */
    public abstract String getTag();

    /*
     * (non-Javadoc)
     * 
     * @see com.itmill.toolkit.ui.Layout#setMargin(boolean)
     */
    public void setMargin(boolean enabled) {
        margins.setMargins(enabled);
        requestRepaint();
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.itmill.toolkit.ui.Layout#setMargin(boolean, boolean, boolean,
     *      boolean)
     */
    public void setMargin(boolean topEnabled, boolean rightEnabled,
            boolean bottomEnabled, boolean leftEnabled) {
        margins
                .setMargins(topEnabled, rightEnabled, bottomEnabled,
                        leftEnabled);
        requestRepaint();
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.itmill.toolkit.terminal.Sizeable#getHeight()
     */
    public int getHeight() {
        return height;
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.itmill.toolkit.terminal.Sizeable#getHeightUnits()
     */
    public int getHeightUnits() {
        return heightUnit;
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.itmill.toolkit.terminal.Sizeable#getWidth()
     */
    public int getWidth() {
        return width;
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.itmill.toolkit.terminal.Sizeable#getWidthUnits()
     */
    public int getWidthUnits() {
        return widthUnit;
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.itmill.toolkit.terminal.Sizeable#setHeight(int)
     */
    public void setHeight(int height) {
        this.height = height;
        requestRepaint();
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.itmill.toolkit.terminal.Sizeable#setHeightUnits(int)
     */
    public void setHeightUnits(int units) {
        heightUnit = units;
        requestRepaint();
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.itmill.toolkit.terminal.Sizeable#setSizeFull()
     */
    public void setSizeFull() {
        height = 100;
        width = 100;
        heightUnit = UNITS_PERCENTAGE;
        widthUnit = UNITS_PERCENTAGE;
        requestRepaint();
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.itmill.toolkit.terminal.Sizeable#setSizeUndefined()
     */
    public void setSizeUndefined() {
        height = -1;
        width = -1;
        heightUnit = UNITS_PIXELS;
        widthUnit = UNITS_PIXELS;
        requestRepaint();
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.itmill.toolkit.terminal.Sizeable#setWidth(int)
     */
    public void setWidth(int width) {
        this.width = width;
        requestRepaint();
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.itmill.toolkit.terminal.Sizeable#setWidthUnits(int)
     */
    public void setWidthUnits(int units) {
        widthUnit = units;
        requestRepaint();
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.itmill.toolkit.ui.AbstractComponent#paintContent(com.itmill.toolkit.terminal.PaintTarget)
     */
    public void paintContent(PaintTarget target) throws PaintException {

        // Add margin info. Defaults to false.
        target.addAttribute("margins", margins.getBitMask());

        // Size
        if (getHeight() >= 0) {
            target.addAttribute("height", "" + getHeight()
                    + Sizeable.UNIT_SYMBOLS[getHeightUnits()]);
        }
        if (getWidth() >= 0) {
            target.addAttribute("width", "" + getWidth()
                    + Sizeable.UNIT_SYMBOLS[getWidthUnits()]);
        }
    }

}