author | chegar |
Mon, 17 Jun 2013 14:09:25 +0100 | |
changeset 18178 | ee71c923891d |
parent 11093 | e753252dc8a9 |
child 23010 | 6dadb192ad81 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
5506 | 2 |
* Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved. |
2 | 3 |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 |
* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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5506 | 7 |
* published by the Free Software Foundation. Oracle designates this |
2 | 8 |
* particular file as subject to the "Classpath" exception as provided |
5506 | 9 |
* by Oracle in the LICENSE file that accompanied this code. |
2 | 10 |
* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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5506 | 21 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
22 |
* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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2 | 24 |
*/ |
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package sun.awt.X11; |
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import java.awt.*; |
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29 |
import java.awt.event.MouseEvent; |
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30 |
import java.awt.event.MouseWheelEvent; |
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31 |
import java.awt.event.AdjustmentEvent; |
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import java.util.ArrayList; |
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import java.util.Iterator; |
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6879044: Eliminate the dependency on logging from the AWT/2D/Swing classes
mchung
parents:
2
diff
changeset
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34 |
import sun.util.logging.PlatformLogger; |
2 | 35 |
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// FIXME: implement multi-select |
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37 |
/* |
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* Class to paint a list of items, possibly with scrollbars |
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* This class paints all items with the same font |
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40 |
* For now, this class manages the list of items and painting thereof, but not |
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41 |
* posting of Item or ActionEvents |
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42 |
*/ |
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43 |
public class ListHelper implements XScrollbarClient { |
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3938
ef327bd847c0
6879044: Eliminate the dependency on logging from the AWT/2D/Swing classes
mchung
parents:
2
diff
changeset
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44 |
private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.X11.ListHelper"); |
2 | 45 |
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46 |
private final int FOCUS_INSET = 1; |
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47 |
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48 |
private final int BORDER_WIDTH; // Width of border drawn around the list |
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49 |
// of items |
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private final int ITEM_MARGIN; // Margin between the border of the list |
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// of items and and item's bg, and between |
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// items |
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private final int TEXT_SPACE; // Space between the edge of an item and |
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// the text |
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55 |
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56 |
private final int SCROLLBAR_WIDTH; // Width of a scrollbar |
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57 |
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private java.util.List items; // List of items |
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59 |
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60 |
// TODO: maybe this would be better as a simple int[] |
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private java.util.List selected; // List of selected items |
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private boolean multiSelect; // Can multiple items be selected |
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// at once? |
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private int focusedIndex; |
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65 |
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66 |
private int maxVisItems; // # items visible without a vsb |
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private XVerticalScrollbar vsb; // null if unsupported |
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private boolean vsbVis; |
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private XHorizontalScrollbar hsb; // null if unsupported |
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private boolean hsbVis; |
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private Font font; |
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private FontMetrics fm; |
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74 |
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private XWindow peer; // So far, only needed for painting |
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76 |
// on notifyValue() |
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private Color[] colors; // Passed in for painting on notifyValue() |
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78 |
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// Holds the true if mouse is dragging outside of the area of the list |
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// The flag is used at the moment of the dragging and releasing mouse |
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// See 6243382 for more information |
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boolean mouseDraggedOutVertically = false; |
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private volatile boolean vsbVisibilityChanged = false; |
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84 |
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85 |
/* |
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* Comment |
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*/ |
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public ListHelper(XWindow peer, |
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Color[] colors, |
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int initialSize, |
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boolean multiSelect, |
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boolean scrollVert, |
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boolean scrollHoriz, |
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Font font, |
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int maxVisItems, |
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int SPACE, |
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int MARGIN, |
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int BORDER, |
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int SCROLLBAR) { |
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this.peer = peer; |
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this.colors = colors; |
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this.multiSelect = multiSelect; |
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items = new ArrayList(initialSize); |
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selected = new ArrayList(1); |
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selected.add(Integer.valueOf(-1)); |
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106 |
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107 |
this.maxVisItems = maxVisItems; |
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108 |
if (scrollVert) { |
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109 |
vsb = new XVerticalScrollbar(this); |
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vsb.setValues(0, 0, 0, 0, 1, maxVisItems - 1); |
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} |
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if (scrollHoriz) { |
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hsb = new XHorizontalScrollbar(this); |
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hsb.setValues(0, 0, 0, 0, 1, 1); |
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} |
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116 |
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setFont(font); |
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TEXT_SPACE = SPACE; |
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ITEM_MARGIN = MARGIN; |
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BORDER_WIDTH = BORDER; |
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SCROLLBAR_WIDTH = SCROLLBAR; |
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} |
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123 |
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public Component getEventSource() { |
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return peer.getEventSource(); |
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} |
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127 |
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/**********************************************************************/ |
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129 |
/* List management methods */ |
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/**********************************************************************/ |
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131 |
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public void add(String item) { |
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items.add(item); |
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updateScrollbars(); |
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} |
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137 |
public void add(String item, int index) { |
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items.add(index, item); |
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updateScrollbars(); |
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} |
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public void remove(String item) { |
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143 |
// FIXME: need to clean up select list, too? |
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items.remove(item); |
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updateScrollbars(); |
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146 |
// Is vsb visible now? |
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} |
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148 |
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149 |
public void remove(int index) { |
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150 |
// FIXME: need to clean up select list, too? |
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items.remove(index); |
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updateScrollbars(); |
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// Is vsb visible now? |
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} |
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156 |
public void removeAll() { |
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157 |
items.removeAll(items); |
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158 |
updateScrollbars(); |
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} |
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160 |
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161 |
public void setMultiSelect(boolean ms) { |
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162 |
multiSelect = ms; |
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} |
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164 |
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165 |
/* |
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166 |
* docs.....definitely docs |
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167 |
* merely keeps internal track of which items are selected for painting |
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168 |
* dealing with target Components happens elsewhere |
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169 |
*/ |
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170 |
public void select(int index) { |
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171 |
if (index > getItemCount() - 1) { |
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index = (isEmpty() ? -1 : 0); |
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} |
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if (multiSelect) { |
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assert false : "Implement ListHelper.select() for multiselect"; |
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} |
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177 |
else if (getSelectedIndex() != index) { |
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selected.remove(0); |
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selected.add(Integer.valueOf(index)); |
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makeVisible(index); |
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} |
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} |
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/* docs */ |
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public void deselect(int index) { |
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assert(false); |
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} |
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/* docs */ |
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/* if called for multiselect, return -1 */ |
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public int getSelectedIndex() { |
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if (!multiSelect) { |
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Integer val = (Integer)selected.get(0); |
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return val.intValue(); |
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} |
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return -1; |
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} |
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int[] getSelectedIndexes() { assert(false); return null;} |
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/* |
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* A getter method for XChoicePeer. |
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* Returns vsbVisiblityChanged value and sets it to false. |
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*/ |
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public boolean checkVsbVisibilityChangedAndReset(){ |
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boolean returnVal = vsbVisibilityChanged; |
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vsbVisibilityChanged = false; |
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return returnVal; |
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} |
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public boolean isEmpty() { |
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return items.isEmpty(); |
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} |
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public int getItemCount() { |
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return items.size(); |
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} |
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public String getItem(int index) { |
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return (String) items.get(index); |
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} |
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/**********************************************************************/ |
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/* GUI-related methods */ |
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/**********************************************************************/ |
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public void setFocusedIndex(int index) { |
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focusedIndex = index; |
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} |
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public boolean isFocusedIndex(int index) { |
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return index == focusedIndex; |
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} |
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public void setFont(Font newFont) { |
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if (newFont != font) { |
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font = newFont; |
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fm = Toolkit.getDefaultToolkit().getFontMetrics(font); |
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// Also cache stuff like fontHeight? |
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} |
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} |
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/* |
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* Returns width of the text of the longest item |
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*/ |
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public int getMaxItemWidth() { |
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int m = 0; |
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int end = getItemCount(); |
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for(int i = 0 ; i < end ; i++) { |
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int l = fm.stringWidth(getItem(i)); |
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m = Math.max(m, l); |
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} |
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return m; |
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} |
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256 |
/* |
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* Height of an item (this doesn't include ITEM_MARGIN) |
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*/ |
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int getItemHeight() { |
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return fm.getHeight() + (2*TEXT_SPACE); |
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} |
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public int y2index(int y) { |
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18178
ee71c923891d
8016747: Replace deprecated PlatformLogger isLoggable(int) with isLoggable(Level)
chegar
parents:
11093
diff
changeset
|
264 |
if (log.isLoggable(PlatformLogger.Level.FINE)) { |
2 | 265 |
log.fine("y=" + y +", firstIdx=" + firstDisplayedIndex() +", itemHeight=" + getItemHeight() |
266 |
+ ",item_margin=" + ITEM_MARGIN); |
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} |
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// See 6243382 for more information |
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269 |
int newIdx = firstDisplayedIndex() + ((y - 2*ITEM_MARGIN) / (getItemHeight() + 2*ITEM_MARGIN)); |
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return newIdx; |
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} |
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273 |
/* write these |
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int index2y(int); |
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public int numItemsDisplayed() {} |
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*/ |
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278 |
public int firstDisplayedIndex() { |
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if (vsbVis) { |
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return vsb.getValue(); |
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} |
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return 0; |
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} |
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285 |
public int lastDisplayedIndex() { |
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// FIXME: need to account for horiz scroll bar |
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if (hsbVis) { |
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assert false : "Implement for horiz scroll bar"; |
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} |
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return vsbVis ? vsb.getValue() + maxVisItems - 1: getItemCount() - 1; |
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} |
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293 |
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294 |
/* |
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295 |
* If the given index is not visible in the List, scroll so that it is. |
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296 |
*/ |
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297 |
public void makeVisible(int index) { |
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298 |
if (vsbVis) { |
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299 |
if (index < firstDisplayedIndex()) { |
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300 |
vsb.setValue(index); |
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} |
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else if (index > lastDisplayedIndex()) { |
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vsb.setValue(index - maxVisItems + 1); |
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} |
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} |
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} |
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307 |
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308 |
// FIXME: multi-select needs separate focused index |
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public void up() { |
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int curIdx = getSelectedIndex(); |
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int numItems = getItemCount(); |
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int newIdx; |
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313 |
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314 |
assert curIdx >= 0; |
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315 |
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316 |
if (curIdx == 0) { |
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newIdx = numItems - 1; |
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} |
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else { |
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320 |
newIdx = --curIdx; |
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321 |
} |
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// focus(newIdx); |
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323 |
select(newIdx); |
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} |
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325 |
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326 |
public void down() { |
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327 |
int newIdx = (getSelectedIndex() + 1) % getItemCount(); |
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328 |
select(newIdx); |
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329 |
} |
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330 |
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331 |
public void pageUp() { |
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332 |
// FIXME: for multi-select, move the focused item, not the selected item |
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333 |
if (vsbVis && firstDisplayedIndex() > 0) { |
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334 |
if (multiSelect) { |
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335 |
assert false : "Implement pageUp() for multiSelect"; |
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336 |
} |
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337 |
else { |
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338 |
int selectionOffset = getSelectedIndex() - firstDisplayedIndex(); |
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339 |
// the vsb does bounds checking |
|
340 |
int newIdx = firstDisplayedIndex() - vsb.getBlockIncrement(); |
|
341 |
vsb.setValue(newIdx); |
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342 |
select(firstDisplayedIndex() + selectionOffset); |
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343 |
} |
|
344 |
} |
|
345 |
} |
|
346 |
public void pageDown() { |
|
347 |
if (vsbVis && lastDisplayedIndex() < getItemCount() - 1) { |
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348 |
if (multiSelect) { |
|
349 |
assert false : "Implement pageDown() for multiSelect"; |
|
350 |
} |
|
351 |
else { |
|
352 |
int selectionOffset = getSelectedIndex() - firstDisplayedIndex(); |
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353 |
// the vsb does bounds checking |
|
354 |
int newIdx = lastDisplayedIndex(); |
|
355 |
vsb.setValue(newIdx); |
|
356 |
select(firstDisplayedIndex() + selectionOffset); |
|
357 |
} |
|
358 |
} |
|
359 |
} |
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360 |
public void home() {} |
|
361 |
public void end() {} |
|
362 |
||
363 |
||
364 |
public boolean isVSBVisible() { return vsbVis; } |
|
365 |
public boolean isHSBVisible() { return hsbVis; } |
|
366 |
||
367 |
public XVerticalScrollbar getVSB() { return vsb; } |
|
368 |
public XHorizontalScrollbar getHSB() { return hsb; } |
|
369 |
||
370 |
public boolean isInVertSB(Rectangle bounds, int x, int y) { |
|
371 |
if (vsbVis) { |
|
372 |
assert vsb != null : "Vert scrollbar is visible, yet is null?"; |
|
373 |
int sbHeight = hsbVis ? bounds.height - SCROLLBAR_WIDTH : bounds.height; |
|
374 |
return (x <= bounds.width) && |
|
375 |
(x >= bounds.width - SCROLLBAR_WIDTH) && |
|
376 |
(y >= 0) && |
|
377 |
(y <= sbHeight); |
|
378 |
} |
|
379 |
return false; |
|
380 |
} |
|
381 |
||
382 |
public boolean isInHorizSB(Rectangle bounds, int x, int y) { |
|
383 |
if (hsbVis) { |
|
384 |
assert hsb != null : "Horiz scrollbar is visible, yet is null?"; |
|
385 |
||
386 |
int sbWidth = vsbVis ? bounds.width - SCROLLBAR_WIDTH : bounds.width; |
|
387 |
return (x <= sbWidth) && |
|
388 |
(x >= 0) && |
|
389 |
(y >= bounds.height - SCROLLBAR_WIDTH) && |
|
390 |
(y <= bounds.height); |
|
391 |
} |
|
392 |
return false; |
|
393 |
} |
|
394 |
||
395 |
public void handleVSBEvent(MouseEvent e, Rectangle bounds, int x, int y) { |
|
396 |
int sbHeight = hsbVis ? bounds.height - SCROLLBAR_WIDTH : bounds.height; |
|
397 |
||
398 |
vsb.handleMouseEvent(e.getID(), |
|
399 |
e.getModifiers(), |
|
400 |
x - (bounds.width - SCROLLBAR_WIDTH), |
|
401 |
y); |
|
402 |
} |
|
403 |
||
404 |
/* |
|
405 |
* Called when items are added/removed. |
|
406 |
* Update whether the scrollbar is visible or not, scrollbar values |
|
407 |
*/ |
|
408 |
void updateScrollbars() { |
|
409 |
boolean oldVsbVis = vsbVis; |
|
410 |
vsbVis = vsb != null && items.size() > maxVisItems; |
|
411 |
if (vsbVis) { |
|
412 |
vsb.setValues(vsb.getValue(), getNumItemsDisplayed(), |
|
413 |
vsb.getMinimum(), items.size()); |
|
414 |
} |
|
415 |
||
416 |
// 6405689. If Vert Scrollbar gets disappeared from the dropdown menu we should repaint whole dropdown even if |
|
417 |
// no actual resize gets invoked. This is needed because some painting artifacts remained between dropdown items |
|
418 |
// but draw3DRect doesn't clear the area inside. Instead it just paints lines as borders. |
|
419 |
vsbVisibilityChanged = (vsbVis != oldVsbVis); |
|
420 |
// FIXME: check if added item makes a hsb necessary (if supported, that of course) |
|
421 |
} |
|
422 |
||
423 |
public int getNumItemsDisplayed() { |
|
424 |
return items.size() > maxVisItems ? maxVisItems : items.size(); |
|
425 |
} |
|
426 |
||
427 |
public void repaintScrollbarRequest(XScrollbar sb) { |
|
428 |
Graphics g = peer.getGraphics(); |
|
429 |
Rectangle bounds = peer.getBounds(); |
|
430 |
if ((sb == vsb) && vsbVis) { |
|
431 |
paintVSB(g, XComponentPeer.getSystemColors(), bounds); |
|
432 |
} |
|
433 |
else if ((sb == hsb) && hsbVis) { |
|
434 |
paintHSB(g, XComponentPeer.getSystemColors(), bounds); |
|
435 |
} |
|
436 |
g.dispose(); |
|
437 |
} |
|
438 |
||
439 |
public void notifyValue(XScrollbar obj, int type, int v, boolean isAdjusting) { |
|
440 |
if (obj == vsb) { |
|
441 |
int oldScrollValue = vsb.getValue(); |
|
442 |
vsb.setValue(v); |
|
443 |
boolean needRepaint = (oldScrollValue != vsb.getValue()); |
|
444 |
// See 6243382 for more information |
|
445 |
if (mouseDraggedOutVertically){ |
|
446 |
int oldItemValue = getSelectedIndex(); |
|
447 |
int newItemValue = getSelectedIndex() + v - oldScrollValue; |
|
448 |
select(newItemValue); |
|
449 |
needRepaint = needRepaint || (getSelectedIndex() != oldItemValue); |
|
450 |
} |
|
451 |
||
452 |
// FIXME: how are we going to paint!? |
|
453 |
Graphics g = peer.getGraphics(); |
|
454 |
Rectangle bounds = peer.getBounds(); |
|
455 |
int first = v; |
|
456 |
int last = Math.min(getItemCount() - 1, |
|
457 |
v + maxVisItems); |
|
458 |
if (needRepaint) { |
|
459 |
paintItems(g, colors, bounds, first, last); |
|
460 |
} |
|
461 |
g.dispose(); |
|
462 |
||
463 |
} |
|
464 |
else if ((XHorizontalScrollbar)obj == hsb) { |
|
465 |
hsb.setValue(v); |
|
466 |
// FIXME: how are we going to paint!? |
|
467 |
} |
|
468 |
} |
|
469 |
||
470 |
public void updateColors(Color[] newColors) { |
|
471 |
colors = newColors; |
|
472 |
} |
|
473 |
||
474 |
/* |
|
475 |
public void paintItems(Graphics g, |
|
476 |
Color[] colors, |
|
477 |
Rectangle bounds, |
|
478 |
Font font, |
|
479 |
int first, |
|
480 |
int last, |
|
481 |
XVerticalScrollbar vsb, |
|
482 |
XHorizontalScrollbar hsb) { |
|
483 |
*/ |
|
484 |
public void paintItems(Graphics g, |
|
485 |
Color[] colors, |
|
486 |
Rectangle bounds) { |
|
487 |
// paint border |
|
488 |
// paint items |
|
489 |
// paint scrollbars |
|
490 |
// paint focus? |
|
491 |
||
492 |
} |
|
493 |
public void paintAllItems(Graphics g, |
|
494 |
Color[] colors, |
|
495 |
Rectangle bounds) { |
|
496 |
paintItems(g, colors, bounds, |
|
497 |
firstDisplayedIndex(), lastDisplayedIndex()); |
|
498 |
} |
|
499 |
public void paintItems(Graphics g, |
|
500 |
Color[] colors, |
|
501 |
Rectangle bounds, |
|
502 |
int first, |
|
503 |
int last) { |
|
504 |
peer.flush(); |
|
505 |
int x = BORDER_WIDTH + ITEM_MARGIN; |
|
506 |
int width = bounds.width - 2*ITEM_MARGIN - 2*BORDER_WIDTH - (vsbVis ? SCROLLBAR_WIDTH : 0); |
|
507 |
int height = getItemHeight(); |
|
508 |
int y = BORDER_WIDTH + ITEM_MARGIN; |
|
509 |
||
510 |
for (int i = first; i <= last ; i++) { |
|
511 |
paintItem(g, colors, getItem(i), |
|
512 |
x, y, width, height, |
|
513 |
isItemSelected(i), |
|
514 |
isFocusedIndex(i)); |
|
515 |
y += height + 2*ITEM_MARGIN; |
|
516 |
} |
|
517 |
||
518 |
if (vsbVis) { |
|
519 |
paintVSB(g, XComponentPeer.getSystemColors(), bounds); |
|
520 |
} |
|
521 |
if (hsbVis) { |
|
522 |
paintHSB(g, XComponentPeer.getSystemColors(), bounds); |
|
523 |
} |
|
524 |
peer.flush(); |
|
525 |
// FIXME: if none of the items were focused, paint focus around the |
|
526 |
// entire list. This is how java.awt.List should work. |
|
527 |
} |
|
528 |
||
529 |
/* |
|
530 |
* comment about what is painted (i.e. the focus rect |
|
531 |
*/ |
|
532 |
public void paintItem(Graphics g, |
|
533 |
Color[] colors, |
|
534 |
String string, |
|
535 |
int x, int y, int width, int height, |
|
536 |
boolean selected, |
|
537 |
boolean focused) { |
|
538 |
//System.out.println("LP.pI(): x="+x+" y="+y+" w="+width+" h="+height); |
|
539 |
//g.setColor(colors[BACKGROUND_COLOR]); |
|
540 |
||
541 |
// FIXME: items shouldn't draw into the scrollbar |
|
542 |
||
543 |
if (selected) { |
|
544 |
g.setColor(colors[XComponentPeer.FOREGROUND_COLOR]); |
|
545 |
} |
|
546 |
else { |
|
547 |
g.setColor(colors[XComponentPeer.BACKGROUND_COLOR]); |
|
548 |
} |
|
549 |
g.fillRect(x, y, width, height); |
|
550 |
||
551 |
if (focused) { |
|
552 |
//g.setColor(colors[XComponentPeer.FOREGROUND_COLOR]); |
|
553 |
g.setColor(Color.BLACK); |
|
554 |
g.drawRect(x + FOCUS_INSET, |
|
555 |
y + FOCUS_INSET, |
|
556 |
width - 2*FOCUS_INSET, |
|
557 |
height - 2*FOCUS_INSET); |
|
558 |
} |
|
559 |
||
560 |
if (selected) { |
|
561 |
g.setColor(colors[XComponentPeer.BACKGROUND_COLOR]); |
|
562 |
} |
|
563 |
else { |
|
564 |
g.setColor(colors[XComponentPeer.FOREGROUND_COLOR]); |
|
565 |
} |
|
566 |
g.setFont(font); |
|
567 |
//Rectangle clip = g.getClipBounds(); |
|
568 |
//g.clipRect(x, y, width, height); |
|
569 |
//g.drawString(string, x + TEXT_SPACE, y + TEXT_SPACE + ITEM_MARGIN); |
|
570 |
||
571 |
int fontAscent = fm.getAscent(); |
|
572 |
int fontDescent = fm.getDescent(); |
|
573 |
||
574 |
g.drawString(string, x + TEXT_SPACE, y + (height + fm.getMaxAscent() - fm.getMaxDescent())/2); |
|
575 |
//g.clipRect(clip.x, clip.y, clip.width, clip.height); |
|
576 |
} |
|
577 |
||
578 |
boolean isItemSelected(int index) { |
|
579 |
Iterator itr = selected.iterator(); |
|
580 |
while (itr.hasNext()) { |
|
581 |
Integer val = (Integer)itr.next(); |
|
582 |
if (val.intValue() == index) { |
|
583 |
return true; |
|
584 |
} |
|
585 |
} |
|
586 |
return false; |
|
587 |
} |
|
588 |
||
589 |
public void paintVSB(Graphics g, Color colors[], Rectangle bounds) { |
|
590 |
int height = bounds.height - 2*BORDER_WIDTH - (hsbVis ? (SCROLLBAR_WIDTH-2) : 0); |
|
591 |
Graphics ng = g.create(); |
|
592 |
||
593 |
g.setColor(colors[XComponentPeer.BACKGROUND_COLOR]); |
|
594 |
try { |
|
595 |
ng.translate(bounds.width - BORDER_WIDTH - SCROLLBAR_WIDTH, |
|
596 |
BORDER_WIDTH); |
|
597 |
// Update scrollbar's size |
|
598 |
vsb.setSize(SCROLLBAR_WIDTH, bounds.height); |
|
599 |
vsb.paint(ng, colors, true); |
|
600 |
} finally { |
|
601 |
ng.dispose(); |
|
602 |
} |
|
603 |
} |
|
604 |
||
605 |
public void paintHSB(Graphics g, Color colors[], Rectangle bounds) { |
|
606 |
||
607 |
} |
|
608 |
||
609 |
/* |
|
610 |
* Helper method for Components with integrated scrollbars. |
|
611 |
* Pass in the vertical and horizontal scroll bar (or null for none/hidden) |
|
612 |
* and the MouseWheelEvent, and the appropriate scrollbar will be scrolled |
|
613 |
* correctly. |
|
614 |
* Returns whether or not scrolling actually took place. This will indicate |
|
615 |
* whether or not repainting is required. |
|
616 |
*/ |
|
617 |
static boolean doWheelScroll(XVerticalScrollbar vsb, |
|
618 |
XHorizontalScrollbar hsb, |
|
619 |
MouseWheelEvent e) { |
|
620 |
XScrollbar scroll = null; |
|
621 |
int wheelRotation; |
|
622 |
||
623 |
// Determine which, if any, sb to scroll |
|
624 |
if (vsb != null) { |
|
625 |
scroll = vsb; |
|
626 |
} |
|
627 |
else if (hsb != null) { |
|
628 |
scroll = hsb; |
|
629 |
} |
|
630 |
else { // Neither scrollbar is showing |
|
631 |
return false; |
|
632 |
} |
|
633 |
||
634 |
wheelRotation = e.getWheelRotation(); |
|
635 |
||
636 |
// Check if scroll is necessary |
|
637 |
if ((wheelRotation < 0 && scroll.getValue() > scroll.getMinimum()) || |
|
638 |
(wheelRotation > 0 && scroll.getValue() < scroll.getMaximum()) || |
|
639 |
wheelRotation != 0) { |
|
640 |
||
641 |
int type = e.getScrollType(); |
|
642 |
int incr; |
|
643 |
if (type == MouseWheelEvent.WHEEL_BLOCK_SCROLL) { |
|
644 |
incr = wheelRotation * scroll.getBlockIncrement(); |
|
645 |
} |
|
646 |
else { // type is WHEEL_UNIT_SCROLL |
|
647 |
incr = e.getUnitsToScroll() * scroll.getUnitIncrement(); |
|
648 |
} |
|
649 |
scroll.setValue(scroll.getValue() + incr); |
|
650 |
return true; |
|
651 |
} |
|
652 |
return false; |
|
653 |
} |
|
654 |
||
655 |
/* |
|
656 |
* Helper method for XChoicePeer with integrated vertical scrollbar. |
|
657 |
* Start or stop vertical scrolling when mouse dragged in / out the area of the list if it's required |
|
658 |
* Restoring Motif behavior |
|
659 |
* See 6243382 for more information |
|
660 |
*/ |
|
661 |
void trackMouseDraggedScroll(int mouseX, int mouseY, int listWidth, int listHeight){ |
|
662 |
||
663 |
if (!mouseDraggedOutVertically){ |
|
664 |
if (vsb.beforeThumb(mouseX, mouseY)) { |
|
665 |
vsb.setMode(AdjustmentEvent.UNIT_DECREMENT); |
|
666 |
} else { |
|
667 |
vsb.setMode(AdjustmentEvent.UNIT_INCREMENT); |
|
668 |
} |
|
669 |
} |
|
670 |
||
671 |
if(!mouseDraggedOutVertically && (mouseY < 0 || mouseY >= listHeight)){ |
|
672 |
mouseDraggedOutVertically = true; |
|
673 |
vsb.startScrollingInstance(); |
|
674 |
} |
|
675 |
||
676 |
if (mouseDraggedOutVertically && mouseY >= 0 && mouseY < listHeight && mouseX >= 0 && mouseX < listWidth){ |
|
677 |
mouseDraggedOutVertically = false; |
|
678 |
vsb.stopScrollingInstance(); |
|
679 |
} |
|
680 |
} |
|
681 |
||
682 |
/* |
|
683 |
* Helper method for XChoicePeer with integrated vertical scrollbar. |
|
684 |
* Stop vertical scrolling when mouse released in / out the area of the list if it's required |
|
685 |
* Restoring Motif behavior |
|
686 |
* see 6243382 for more information |
|
687 |
*/ |
|
688 |
void trackMouseReleasedScroll(){ |
|
689 |
||
690 |
if (mouseDraggedOutVertically){ |
|
691 |
mouseDraggedOutVertically = false; |
|
692 |
vsb.stopScrollingInstance(); |
|
693 |
} |
|
694 |
||
695 |
} |
|
696 |
} |