/*
 * Java-Gnome Bindings Library
 *
 * Copyright 1998-2004 the Java-Gnome Team, all rights reserved.
 *
 * The Java-Gnome bindings library is free software distributed under
 * the terms of the GNU Library General Public License version 2.
 */

package org.gnu.gtk;

import org.gnu.glib.Type;
import org.gnu.glib.Handle;

/**
 * A Viewport is a container that does not resize to fit in the space allocated
 * to it. Instead, it adds scrollbars as necessary so you can view any part of
 * the window.
 */
public class Viewport extends Bin {
    /**
     * Construct a new Viewport with the given Adjustments.
     * 
     * @param hadj
     *            The horizontal Adjustment to use for the Viewport.
     * @param vadj
     *            The vertical Adjustment to use for the Viewport.
     */
    public Viewport(Adjustment hadj, Adjustment vadj) {
        super(init(hadj, vadj));
    }

    private static Handle init(Adjustment hadj, Adjustment vadj) {
        Handle horizontal = null;
        Handle vertical = null;
        if (null != hadj) {
            horizontal = hadj.getHandle();
        }
        if (null != vadj) {
            vertical = vadj.getHandle();
        }
        return gtk_viewport_new(horizontal, vertical);
    }

    /**
     * Construct a Viewport using a handle to a native resource.
     */
    public Viewport(Handle handle) {
        super(handle);
    }

    /**
     * Internal static factory method to be used by Java-Gnome only.
     */
    public static Viewport getViewport(Handle handle) {
        if (handle == null)
            return null;

        Viewport obj = (Viewport) getGObjectFromHandle(handle);
        if (obj == null)
            obj = new Viewport(handle);

        return obj;
    }

    /**
     * Returns the horizontal Viewport's Adjustment. This can be used to connect
     * the horizontal scrollbar to the child Widget's horizontal scroll
     * functionality.
     * 
     * @return The horizontal Viewport's Adjustment.
     */
    public Adjustment getHAdjustment() {
        Handle hndl = gtk_viewport_get_hadjustment(getHandle());
        return Adjustment.getAdjustment(hndl);
    }

    /**
     * Sets the horizontal Viewport's Adjustment.
     * 
     * @param hadj
     *            The horizontal Adjustment.
     */
    public void setHAdjustment(Adjustment hadj) {
        Viewport.gtk_viewport_set_hadjustment(getHandle(), hadj.getHandle());
    }

    /**
     * Returns the vertical Viewport's Adjustment. This can be used to connect
     * the vertical scrollbar to the child Widget's vertical scroll
     * functionality.
     * 
     * @return The vertical Viewport's Adjustment.
     */
    public Adjustment getVAdjustment() {
        Handle hndl = gtk_viewport_get_vadjustment(getHandle());
        return Adjustment.getAdjustment(hndl);
    }

    /**
     * Sets the vertical Viewport's Adjustment.
     * 
     * @param vadj
     *            The vertical Adjustment.
     */
    public void setVAdjustment(Adjustment vadj) {
        Viewport.gtk_viewport_set_vadjustment(getHandle(), vadj.getHandle());
    }

    /**
     * Retrieve the runtime type used by the GLib library.
     */
    public static Type getType() {
        return new Type(gtk_viewport_get_type());
    }

    native static final protected int gtk_viewport_get_type();

    native static final protected Handle gtk_viewport_new(Handle hadjustment,
            Handle vadjustment);

    native static final protected Handle gtk_viewport_get_hadjustment(
            Handle viewport);

    native static final protected void gtk_viewport_set_hadjustment(
            Handle viewport, Handle adjustment);

    native static final protected Handle gtk_viewport_get_vadjustment(
            Handle viewport);

    native static final protected void gtk_viewport_set_vadjustment(
            Handle viewport, Handle adjustment);

    native static final protected void gtk_viewport_set_shadow_type(
            Handle viewport, int type);

    native static final protected int gtk_viewport_get_shadow_type(
            Handle viewport);
}