/*

 * Copyright 2002-2006 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package sun.awt.X11;

import java.awt.*;

import java.awt.event.*;

import java.awt.peer.*;

class XScrollbarPeer extends XComponentPeer implements ScrollbarPeer, XScrollbarClient {

    private static final int DEFAULT_LENGTH = 50;

    private static final int DEFAULT_WIDTH_SOLARIS = 19;

    private static final int DEFAULT_WIDTH_LINUX;

    XScrollbar tsb;

    static {

        DEFAULT_WIDTH_LINUX = XToolkit.getUIDefaults().getInt("ScrollBar.defaultWidth");

    }

    public void preInit(XCreateWindowParams params) {

        super.preInit(params);

        Scrollbar target = (Scrollbar) this.target;

        if (target.getOrientation() == Scrollbar.VERTICAL) {

            tsb = new XVerticalScrollbar(this);

        } else {

            tsb = new XHorizontalScrollbar(this);

        }

        int min = target.getMinimum();

        int max = target.getMaximum();

        int vis = target.getVisibleAmount();

        int val = target.getValue();

        int line = target.getLineIncrement();

        int page = target.getPageIncrement();

        tsb.setValues(val, vis, min, max, line, page);

    }

    /**

     * Create a scrollbar.

     */

    XScrollbarPeer(Scrollbar target) {

        super(target);

        this.target = target;

        xSetVisible(true);

    }

    /**

     * Returns default size of scrollbar on the platform

     * Currently uses hardcoded values

     */

    private int getDefaultDimension() {

        if (System.getProperty("os.name").equals("Linux")) {

            return DEFAULT_WIDTH_LINUX;

        } else {

            return DEFAULT_WIDTH_SOLARIS;

        }

    }

    /**

     * Compute the minimum size for the scrollbar.

     */

    public Dimension getMinimumSize() {

        Scrollbar sb = (Scrollbar)target;

        return (sb.getOrientation() == Scrollbar.VERTICAL)

            ? new Dimension(getDefaultDimension(), DEFAULT_LENGTH)

                : new Dimension(DEFAULT_LENGTH, getDefaultDimension());

    }

    public void repaint() {

        Graphics g = getGraphics();

        if (g != null) paint(g);

    }

    /**

     * Paint the scrollbar.

     */

    public void paint(Graphics g) {

        Scrollbar sb = (Scrollbar)target;

        Color colors[] = getGUIcolors();

        g.setColor(colors[BACKGROUND_COLOR]);

        tsb.paint(g, colors, true);

        // paint the whole scrollbar

    }

    public void repaintScrollbarRequest(XScrollbar sb) {

     repaint();

    }

    /**

     * The value has changed.

     */

    public void notifyValue(XScrollbar obj, int type, int value, boolean isAdjusting) {

        Scrollbar sb = (Scrollbar)target;

        sb.setValue(value);

        postEvent( new AdjustmentEvent(sb, AdjustmentEvent.ADJUSTMENT_VALUE_CHANGED, type, value, isAdjusting));

    }

    /**

     *

     * @see java.awt.event.MouseEvent

     * MouseEvent.MOUSE_CLICKED

     * MouseEvent.MOUSE_PRESSED

     * MouseEvent.MOUSE_RELEASED

     * MouseEvent.MOUSE_MOVED

     * MouseEvent.MOUSE_ENTERED

     * MouseEvent.MOUSE_EXITED

     * MouseEvent.MOUSE_DRAGGED

     */

    public void handleJavaMouseEvent( MouseEvent mouseEvent ) {

        super.handleJavaMouseEvent(mouseEvent);

        int x = mouseEvent.getX();

        int y = mouseEvent.getY();

        int modifiers = mouseEvent.getModifiers();

        int id = mouseEvent.getID();

        if ((mouseEvent.getModifiers() & InputEvent.BUTTON1_MASK) == 0) {

            return;

        }

        switch (mouseEvent.getID()) {

          case MouseEvent.MOUSE_PRESSED:

              target.requestFocus();

              tsb.handleMouseEvent(id, modifiers,x,y);

              break;

          case MouseEvent.MOUSE_RELEASED:

              tsb.handleMouseEvent(id, modifiers,x,y);

              break;

          case MouseEvent.MOUSE_DRAGGED:

              tsb.handleMouseEvent(id, modifiers,x,y);

              break;

        }

    }

    public void handleJavaKeyEvent(KeyEvent event) {

        super.handleJavaKeyEvent(event);

        if (!(event.isConsumed()) && event.getID() == KeyEvent.KEY_RELEASED) {

            switch(event.getKeyCode()) {

            case KeyEvent.VK_UP:

                log.finer("Scrolling up");

                tsb.notifyValue(tsb.getValue() - tsb.getUnitIncrement());

                break;

            case KeyEvent.VK_DOWN:

                log.finer("Scrolling down");

                tsb.notifyValue(tsb.getValue() + tsb.getUnitIncrement());

                break;

            case KeyEvent.VK_LEFT:

                log.finer("Scrolling up");

                tsb.notifyValue(tsb.getValue() - tsb.getUnitIncrement());

                break;

            case KeyEvent.VK_RIGHT:

                log.finer("Scrolling down");

                tsb.notifyValue(tsb.getValue() + tsb.getUnitIncrement());

                break;

            case KeyEvent.VK_PAGE_UP:

                log.finer("Scrolling page up");

                tsb.notifyValue(tsb.getValue() - tsb.getBlockIncrement());

                break;

            case KeyEvent.VK_PAGE_DOWN:

                log.finer("Scrolling page down");

                tsb.notifyValue(tsb.getValue() + tsb.getBlockIncrement());

                break;

            case KeyEvent.VK_HOME:

                log.finer("Scrolling to home");

                tsb.notifyValue(0);

                break;

            case KeyEvent.VK_END:

                log.finer("Scrolling to end");

                tsb.notifyValue(tsb.getMaximum());

                break;

            }

        }

    }

    public void setValue(int value) {

        tsb.setValue(value);

        repaint();

    }

    public void setValues(int value, int visible, int minimum, int maximum) {

        tsb.setValues(value, visible, minimum, maximum);

        repaint();

    }

    public void setLineIncrement(int l) {

        tsb.setUnitIncrement(l);

    }

    public void setPageIncrement(int p) {

        tsb.setBlockIncrement(p);

    }

    public void layout() {

        super.layout();

        tsb.setSize(width, height);

    }

}