/*
 * Copyright (c) 2002, 2014, Oracle and/or its affiliates. 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.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.*;
import sun.util.logging.PlatformLogger;

class XScrollbarPeer extends XComponentPeer implements ScrollbarPeer, XScrollbarClient {
    private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.X11.XScrollbarPeer");

    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");
    }

    @SuppressWarnings("deprecation")
    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.
/** * 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
/** * 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.
/** * 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()); }
Paint the scrollbar.
/** * Paint the scrollbar. */
@Override void paintPeer(final Graphics g) { final 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.
/** * 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 Also:
  • MouseEvent.MOUSE_CLICKED MouseEvent.MOUSE_PRESSED MouseEvent.MOUSE_RELEASED MouseEvent.MOUSE_MOVED MouseEvent.MOUSE_ENTERED MouseEvent.MOUSE_EXITED MouseEvent.MOUSE_DRAGGED
/** * * @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 */
@SuppressWarnings("deprecation") 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 (log.isLoggable(PlatformLogger.Level.FINER)) { log.finer("KeyEvent on scrollbar: " + 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); } }