Java example source code file (XListPeer.java)
The XListPeer.java Java example source code
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* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
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*
* 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.
*
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// Very much based on XListPeer from javaos
package sun.awt.X11;
import java.awt.*;
import java.awt.event.*;
import java.awt.peer.*;
import java.util.Objects;
import java.util.Vector;
import java.awt.image.*;
import sun.util.logging.PlatformLogger;
// TODO: some input actions should do nothing if Shift or Control are down
class XListPeer extends XComponentPeer implements ListPeer, XScrollbarClient {
private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.X11.XListPeer");
public final static int MARGIN = 2;
public final static int SPACE = 1;
public final static int SCROLLBAR_AREA = 17; // Area reserved for the
// scrollbar
public final static int SCROLLBAR_WIDTH = 13; // Actual width of the
// scrollbar
public final static int NONE = -1;
public final static int WINDOW = 0;
public final static int VERSCROLLBAR = 1;
public final static int HORSCROLLBAR = 2;
public final static int DEFAULT_VISIBLE_ROWS = 4; // From java.awt.List,
public final static int HORIZ_SCROLL_AMT = 10;
private final static int PAINT_VSCROLL = 2;
private final static int PAINT_HSCROLL = 4;
private final static int PAINT_ITEMS = 8;
private final static int PAINT_FOCUS = 16;
private final static int PAINT_BACKGROUND = 32;
private final static int PAINT_HIDEFOCUS = 64;
private final static int PAINT_ALL =
PAINT_VSCROLL | PAINT_HSCROLL | PAINT_ITEMS | PAINT_FOCUS | PAINT_BACKGROUND;
private final static int COPY_AREA = 128;
XVerticalScrollbar vsb;
XHorizontalScrollbar hsb;
ListPainter painter;
// TODO: ick - Vector?
Vector items;
boolean multipleSelections;
int active = NONE;
// Holds the array of the indexes of the elements which is selected
// This array should be kept sorted, low to high.
int selected[];
int fontHeight;
int fontAscent;
int fontLeading;
// Holds the index of the item used in the previous operation (selectItem, deselectItem)
// Adding of an item or clearing of the list sets this index to -1
// The index is used at the moment of the post of ACTION_PERFORMED event after the mouse double click event.
int currentIndex = -1;
// Used for tracking selection/deselection between mousePress/Release
// and for ItemEvents
int eventIndex = -1;
int eventType = NONE;
// Holds the index of the item that receive focus
// This variable is reasonable only for multiple list
// since 'focusIndex' and 'selected[0]' are equal for single-selection list
int focusIndex;
int maxLength;
boolean vsbVis; // visibility of scrollbars
boolean hsbVis;
int listWidth; // Width of list portion of List
int listHeight; // Height of list portion of List
// (i.e. without scrollbars)
private int firstTimeVisibleIndex = 0;
// Motif Lists don't seem to inherit the background color from their
// parent when an app is first started up. So, we track if the colors have
// been set. See getListBackground()/getListForeground().
boolean bgColorSet;
boolean fgColorSet;
// Holds the true if mouse is dragging outside of the area of the list
// The flag is used at the moment of the dragging and releasing mouse
// See 6243382 for more information
boolean mouseDraggedOutHorizontally = false;
boolean mouseDraggedOutVertically = false;
// Holds the true if a mouse event was originated on the scrollbar
// See 6300527 for more information
boolean isScrollBarOriginated = false;
// This variable is set to true after the "mouse pressed" event and to false after the "mouse released" event
// Fixed 6293432: Key events ('SPACE', 'UP', 'DOWN') aren't blocked if mouse is kept in 'PRESSED' state for List, XAWT
boolean isMousePressed = false;
/**
* Create a list
*/
XListPeer(List target) {
super(target);
}
/**
* Overridden from XWindow
*/
public void preInit(XCreateWindowParams params) {
super.preInit(params);
// Stuff that must be initialized before layout() is called
items = new Vector();
createVerScrollbar();
createHorScrollbar();
painter = new ListPainter();
// See 6246467 for more information
bgColorSet = target.isBackgroundSet();
fgColorSet = target.isForegroundSet();
}
public void postInit(XCreateWindowParams params) {
super.postInit(params);
initFontMetrics();
// TODO: more efficient way?
// do we really want/need a copy of all the items?
// get all items from target
List l = (List)target;
int stop = l.getItemCount();
for (int i = 0 ; i < stop; i++) {
items.addElement(l.getItem(i));
}
/* make the visible position visible. */
int index = l.getVisibleIndex();
if (index >= 0) {
// Can't call makeVisible since it check scroll bar,
// initialize scroll bar instead
vsb.setValues(index, 0, 0, items.size());
}
// NOTE: needs to have target set
maxLength = maxLength();
// get the index containing all indexes to selected items
int sel[] = l.getSelectedIndexes();
selected = new int[sel.length];
// TODO: shouldn't this be arraycopy()?
for (int i = 0 ; i < sel.length ; i ++) {
selected[i] = sel[i];
}
// The select()ed item should become the focused item, but we don't
// get the select() call because the peer generally hasn't yet been
// created during app initialization.
// TODO: For multi-select lists, it should be the highest selected index
if (sel.length > 0) {
setFocusIndex(sel[sel.length - 1]);
}
else {
setFocusIndex(0);
}
multipleSelections = l.isMultipleMode();
}
/**
* add Vertical Scrollbar
*/
void createVerScrollbar() {
vsb = new XVerticalScrollbar(this);
vsb.setValues(0, 0, 0, 0, 1, 1);
}
/**
* add Horizontal scrollbar
*/
void createHorScrollbar() {
hsb = new XHorizontalScrollbar(this);
hsb.setValues(0, 0, 0, 0, HORIZ_SCROLL_AMT, HORIZ_SCROLL_AMT);
}
/* New method name for 1.1 */
public void add(String item, int index) {
addItem(item, index);
}
/* New method name for 1.1 */
public void removeAll() {
clear();
maxLength = 0;
}
/* New method name for 1.1 */
public void setMultipleMode (boolean b) {
setMultipleSelections(b);
}
/* New method name for 1.1 */
public Dimension getPreferredSize(int rows) {
return preferredSize(rows);
}
/* New method name for 1.1 */
public Dimension getMinimumSize(int rows) {
return minimumSize(rows);
}
/**
* Minimum size.
*/
public Dimension minimumSize() {
return minimumSize(DEFAULT_VISIBLE_ROWS);
}
/**
* return the preferredSize
*/
public Dimension preferredSize(int v) {
return minimumSize(v);
}
/**
* return the minimumsize
*/
public Dimension minimumSize(int v) {
FontMetrics fm = getFontMetrics(getFont());
initFontMetrics();
return new Dimension(20 + fm.stringWidth("0123456789abcde"),
getItemHeight() * v + (2*MARGIN));
}
/**
* Calculate font metrics
*/
void initFontMetrics() {
FontMetrics fm = getFontMetrics(getFont());
fontHeight = fm.getHeight();
fontAscent = fm.getAscent();
fontLeading = fm.getLeading();
}
/**
* return the length of the largest item in the list
*/
int maxLength() {
FontMetrics fm = getFontMetrics(getFont());
int m = 0;
int end = items.size();
for(int i = 0 ; i < end ; i++) {
int l = fm.stringWidth(((String)items.elementAt(i)));
m = Math.max(m, l);
}
return m;
}
/**
* Calculates the width of item's label
*/
int getItemWidth(int i) {
FontMetrics fm = getFontMetrics(getFont());
return fm.stringWidth((String)items.elementAt(i));
}
/**
* return the on-screen width of the given string "str"
*/
int stringLength(String str) {
FontMetrics fm = getFontMetrics(target.getFont());
return fm.stringWidth(str);
}
public void setForeground(Color c) {
fgColorSet = true;
super.setForeground(c);
}
public void setBackground(Color c) {
bgColorSet = true;
super.setBackground(c);
}
/**
* Returns the color that should be used to paint the background of
* the list of items. Note that this is not the same as
* target.getBackground() which is the color of the scrollbars, and the
* lower-right corner of the Component when the scrollbars are displayed.
*/
private Color getListBackground(Color[] colors) {
if (bgColorSet) {
return colors[BACKGROUND_COLOR];
}
else {
return SystemColor.text;
}
}
/**
* Returns the color that should be used to paint the list item text.
*/
private Color getListForeground(Color[] colors) {
if (fgColorSet) {
return colors[FOREGROUND_COLOR];
}
else {
return SystemColor.textText;
}
}
Rectangle getVScrollBarRec() {
return new Rectangle(width - (SCROLLBAR_WIDTH), 0, SCROLLBAR_WIDTH+1, height);
}
Rectangle getHScrollBarRec() {
return new Rectangle(0, height - SCROLLBAR_WIDTH, width, SCROLLBAR_WIDTH);
}
int getFirstVisibleItem() {
if (vsbVis) {
return vsb.getValue();
} else {
return 0;
}
}
int getLastVisibleItem() {
if (vsbVis) {
return Math.min(items.size()-1, vsb.getValue() + itemsInWindow() -1);
} else {
return Math.min(items.size()-1, itemsInWindow()-1);
}
}
public void repaintScrollbarRequest(XScrollbar scrollbar) {
if (scrollbar == hsb) {
repaint(PAINT_HSCROLL);
}
else if (scrollbar == vsb) {
repaint(PAINT_VSCROLL);
}
}
/**
* Overridden for performance
*/
public void repaint() {
repaint(getFirstVisibleItem(), getLastVisibleItem(), PAINT_ALL);
}
private void repaint(int options) {
repaint(getFirstVisibleItem(), getLastVisibleItem(), options);
}
private void repaint(int firstItem, int lastItem, int options) {
repaint(firstItem, lastItem, options, null, null);
}
/**
* In most cases the entire area of the component doesn't have
* to be repainted. The method repaints the particular areas of
* the component. The areas to repaint is specified by the option
* parameter. The possible values of the option parameter are:
* PAINT_VSCROLL, PAINT_HSCROLL, PAINT_ITEMS, PAINT_FOCUS,
* PAINT_HIDEFOCUS, PAINT_BACKGROUND, PAINT_ALL, COPY_AREA.
*
* Note that the COPY_AREA value initiates copy of a source area
* of the component by a distance by means of the copyArea method
* of the Graphics class.
*
* @param firstItem the position of the first item of the range to repaint
* @param lastItem the position of the last item of the range to repaint
* @param options specifies the particular area of the component to repaint
* @param source the area of the component to copy
* @param distance the distance to copy the source area
*/
private void repaint(int firstItem, int lastItem, int options, Rectangle source, Point distance) {
final Graphics g = getGraphics();
if (g != null) {
try {
painter.paint(g, firstItem, lastItem, options, source, distance);
postPaintEvent(target, 0, 0, getWidth(), getHeight());
} finally {
g.dispose();
}
}
}
@Override
void paintPeer(final Graphics g) {
painter.paint(g, getFirstVisibleItem(), getLastVisibleItem(), PAINT_ALL);
}
public boolean isFocusable() { return true; }
// TODO: share/promote the Focus methods?
public void focusGained(FocusEvent e) {
super.focusGained(e);
repaint(PAINT_FOCUS);
}
public void focusLost(FocusEvent e) {
super.focusLost(e);
repaint(PAINT_FOCUS);
}
/**
* Layout the sub-components of the List - that is, the scrollbars and the
* list of items.
*/
public void layout() {
int vis, maximum;
boolean vsbWasVisible;
int origVSBVal;
assert(target != null);
// Start with assumption there is not a horizontal scrollbar,
// see if we need a vertical scrollbar
// Bug: If the list DOES have a horiz scrollbar and the value is set to
// the very bottom value, value is reset in setValues() because it isn't
// a valid value for cases when the list DOESN'T have a horiz scrollbar.
// This is currently worked-around with origVSGVal.
origVSBVal = vsb.getValue();
vis = itemsInWindow(false);
maximum = items.size() < vis ? vis : items.size();
vsb.setValues(vsb.getValue(), vis, vsb.getMinimum(), maximum);
vsbVis = vsbWasVisible = vsbIsVisible(false);
listHeight = height;
// now see if we need a horizontal scrollbar
listWidth = getListWidth();
vis = listWidth - ((2 * SPACE) + (2 * MARGIN));
maximum = maxLength < vis ? vis : maxLength;
hsb.setValues(hsb.getValue(), vis, hsb.getMinimum(), maximum);
hsbVis = hsbIsVisible(vsbVis);
if (hsbVis) {
// do need a horizontal scrollbar, so recalculate height of
// vertical s crollbar
listHeight = height - SCROLLBAR_AREA;
vis = itemsInWindow(true);
maximum = items.size() < vis ? vis : items.size();
vsb.setValues(origVSBVal, vis, vsb.getMinimum(), maximum);
vsbVis = vsbIsVisible(true);
}
// now check to make sure we haven't changed need for vertical
// scrollbar - if we have, we need to
// recalculate horizontal scrollbar width - then we're done...
if (vsbWasVisible != vsbVis) {
listWidth = getListWidth();
vis = listWidth - ((2 * SPACE) + (2 * MARGIN));
maximum = maxLength < vis ? 0 : maxLength;
hsb.setValues(hsb.getValue(), vis, hsb.getMinimum(), maximum);
hsbVis = hsbIsVisible(vsbVis);
}
vsb.setSize(SCROLLBAR_WIDTH, listHeight);
hsb.setSize(listWidth, SCROLLBAR_WIDTH);
vsb.setBlockIncrement(itemsInWindow());
hsb.setBlockIncrement(width - ((2 * SPACE) + (2 * MARGIN) + (vsbVis ? SCROLLBAR_AREA : 0)));
}
int getItemWidth() {
return width - ((2 * MARGIN) + (vsbVis ? SCROLLBAR_AREA : 0));
}
/* Returns height of an item in the list */
int getItemHeight() {
return (fontHeight - fontLeading) + (2*SPACE);
}
int getItemX() {
return MARGIN + SPACE;
}
int getItemY(int item) {
return index2y(item);
}
int getFocusIndex() {
return focusIndex;
}
void setFocusIndex(int value) {
focusIndex = value;
}
/**
* Update and return the focus rectangle.
* Focus is around the focused item, if it is visible, or
* around the border of the list if the focused item is scrolled off the top
* or bottom of the list.
*/
Rectangle getFocusRect() {
Rectangle focusRect = new Rectangle();
// width is always only based on presence of vert sb
focusRect.x = 1;
focusRect.width = getListWidth() - 3;
// if focused item is not currently displayed in the list, paint
// focus around entire list (not including scrollbars)
if (isIndexDisplayed(getFocusIndex())) {
// focus rect is around the item
focusRect.y = index2y(getFocusIndex()) - 2;
focusRect.height = getItemHeight()+1;
} else {
// focus rect is around the list
focusRect.y = 1;
focusRect.height = hsbVis ? height - SCROLLBAR_AREA : height;
focusRect.height -= 3;
}
return focusRect;
}
public void handleConfigureNotifyEvent(XEvent xev) {
super.handleConfigureNotifyEvent(xev);
// Update buffer
painter.invalidate();
}
public boolean handlesWheelScrolling() { return true; }
// FIXME: need to support MouseWheel scrolling, too
void handleJavaMouseEvent(MouseEvent e) {
super.handleJavaMouseEvent(e);
int i = e.getID();
switch (i) {
case MouseEvent.MOUSE_PRESSED:
mousePressed(e);
break;
case MouseEvent.MOUSE_RELEASED:
mouseReleased(e);
break;
case MouseEvent.MOUSE_DRAGGED:
mouseDragged(e);
break;
}
}
void handleJavaMouseWheelEvent(MouseWheelEvent e) {
if (ListHelper.doWheelScroll(vsbVis ? vsb : null,
hsbVis ? hsb : null, e)) {
repaint();
}
}
void mousePressed(MouseEvent mouseEvent) {
if (log.isLoggable(PlatformLogger.Level.FINER)) {
log.finer(mouseEvent.toString() + ", hsb " + hsbVis + ", vsb " + vsbVis);
}
if (isEnabled() && mouseEvent.getButton() == MouseEvent.BUTTON1) {
if (inWindow(mouseEvent.getX(), mouseEvent.getY())) {
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine("Mouse press in items area");
}
active = WINDOW;
int i = y2index(mouseEvent.getY());
if (i >= 0) {
if (multipleSelections) {
if (isSelected(i)) {
// See 6243382 for more information
deselectItem(i);
eventIndex = i;
eventType = ItemEvent.DESELECTED;
}
else {
selectItem(i);
eventIndex = i;
eventType = ItemEvent.SELECTED;
}
}
// Backward-compatible bug: even if a single-select
// item is already selected, we send an ITEM_STATE_CHANGED/
// SELECTED event. Engineer's Toolbox appears to rely on
// this.
//else if (!isSelected(i)) {
else {
selectItem(i);
eventIndex = i;
eventType = ItemEvent.SELECTED;
}
// Restoring Windows behaviour
// We should update focus index after "mouse pressed" event
setFocusIndex(i);
repaint(PAINT_FOCUS);
} else {
// 6426186: reset variable to prevent action event
// if user clicks on unoccupied area of list
currentIndex = -1;
}
} else if (inVerticalScrollbar(mouseEvent.getX(), mouseEvent.getY())) {
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine("Mouse press in vertical scrollbar");
}
active = VERSCROLLBAR;
vsb.handleMouseEvent(mouseEvent.getID(),
mouseEvent.getModifiers(),
mouseEvent.getX() - (width - SCROLLBAR_WIDTH),
mouseEvent.getY());
} else if (inHorizontalScrollbar(mouseEvent.getX(), mouseEvent.getY())) {
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine("Mouse press in horizontal scrollbar");
}
active = HORSCROLLBAR;
hsb.handleMouseEvent(mouseEvent.getID(),
mouseEvent.getModifiers(),
mouseEvent.getX(),
mouseEvent.getY() - (height - SCROLLBAR_WIDTH));
}
isMousePressed = true;
}
}
void mouseReleased(MouseEvent mouseEvent) {
if (isEnabled() && mouseEvent.getButton() == MouseEvent.BUTTON1) {
//winReleaseCursorFocus();
int clickCount = mouseEvent.getClickCount();
if (active == VERSCROLLBAR) {
vsb.handleMouseEvent(mouseEvent.getID(),
mouseEvent.getModifiers(),
mouseEvent.getX()-(width-SCROLLBAR_WIDTH),
mouseEvent.getY());
} else if(active == HORSCROLLBAR) {
hsb.handleMouseEvent(mouseEvent.getID(),
mouseEvent.getModifiers(),
mouseEvent.getX(),
mouseEvent.getY()-(height-SCROLLBAR_WIDTH));
} else if ( ( currentIndex >= 0 ) && ( clickCount >= 2 ) &&
( clickCount % 2 == 0 ) ) {
postEvent(new ActionEvent(target,
ActionEvent.ACTION_PERFORMED,
(String)items.elementAt(currentIndex),
mouseEvent.getWhen(),
mouseEvent.getModifiers())); // No ext mods
} else if (active == WINDOW) {
// See 6243382 for more information
trackMouseReleasedScroll();
if (eventType == ItemEvent.DESELECTED) {
assert multipleSelections : "Shouldn't get a deselect for a single-select List";
// Paint deselection the release
deselectItem(eventIndex);
}
if (eventType != NONE) {
postEvent(new ItemEvent((List)target,
ItemEvent.ITEM_STATE_CHANGED,
Integer.valueOf(eventIndex),
eventType));
}
}
active = NONE;
eventIndex = -1;
eventType = NONE;
isMousePressed = false;
}
}
void mouseDragged(MouseEvent mouseEvent) {
// TODO: can you drag w/ any other buttons? what about multiple buttons?
if (isEnabled() &&
(mouseEvent.getModifiersEx() & InputEvent.BUTTON1_DOWN_MASK) != 0) {
if ((active == VERSCROLLBAR)) {
vsb.handleMouseEvent(mouseEvent.getID(),
mouseEvent.getModifiers(),
mouseEvent.getX()-(width-SCROLLBAR_WIDTH),
mouseEvent.getY());
} else if ((active == HORSCROLLBAR)) {
hsb.handleMouseEvent(mouseEvent.getID(),
mouseEvent.getModifiers(),
mouseEvent.getX(),
mouseEvent.getY()-(height-SCROLLBAR_WIDTH));
} else if (active == WINDOW) {
int i = y2index(mouseEvent.getY());
if (multipleSelections) {
// Multi-select only:
// If a selected item was pressed on and then dragged off
// of, cancel the pending deselect.
if (eventType == ItemEvent.DESELECTED) {
if (i != eventIndex) {
eventType = NONE;
eventIndex = -1;
}
}
}
else if (eventType == ItemEvent.SELECTED) {
// Single-select only:
// If an unselected item was pressed on, track the drag
// and select the item under the mouse
// See 6243382 for more information
trackMouseDraggedScroll(mouseEvent);
if (i >= 0 && !isSelected(i)) {
int oldSel = eventIndex;
selectItem(i);
eventIndex = i;
repaint(oldSel, eventIndex, PAINT_ITEMS);
}
}
// Restoring Windows behaviour
// We should update focus index after "mouse dragged" event
if (i >= 0) {
setFocusIndex(i);
repaint(PAINT_FOCUS);
}
}
}
}
/*
* Helper method for XListPeer with integrated vertical scrollbar.
* Start or stop vertical scrolling when mouse dragged in / out the area of the list if it's required
* Restoring Motif behavior
* See 6243382 for more information
*/
void trackMouseDraggedScroll(MouseEvent mouseEvent){
if (vsb.beforeThumb(mouseEvent.getX(), mouseEvent.getY())) {
vsb.setMode(AdjustmentEvent.UNIT_DECREMENT);
} else {
vsb.setMode(AdjustmentEvent.UNIT_INCREMENT);
}
if(mouseEvent.getY() < 0 || mouseEvent.getY() >= listHeight){
if (!mouseDraggedOutVertically){
mouseDraggedOutVertically = true;
vsb.startScrollingInstance();
}
}else{
if (mouseDraggedOutVertically){
mouseDraggedOutVertically = false;
vsb.stopScrollingInstance();
}
}
if (hsb.beforeThumb(mouseEvent.getX(), mouseEvent.getY())) {
hsb.setMode(AdjustmentEvent.UNIT_DECREMENT);
} else {
hsb.setMode(AdjustmentEvent.UNIT_INCREMENT);
}
if (mouseEvent.getX() < 0 || mouseEvent.getX() >= listWidth) {
if (!mouseDraggedOutHorizontally){
mouseDraggedOutHorizontally = true;
hsb.startScrollingInstance();
}
}else{
if (mouseDraggedOutHorizontally){
mouseDraggedOutHorizontally = false;
hsb.stopScrollingInstance();
}
}
}
/*
* Helper method for XListPeer with integrated vertical scrollbar.
* Stop vertical scrolling when mouse released in / out the area of the list if it's required
* Restoring Motif behavior
* see 6243382 for more information
*/
void trackMouseReleasedScroll(){
if (mouseDraggedOutVertically){
mouseDraggedOutVertically = false;
vsb.stopScrollingInstance();
}
if (mouseDraggedOutHorizontally){
mouseDraggedOutHorizontally = false;
hsb.stopScrollingInstance();
}
}
void handleJavaKeyEvent(KeyEvent e) {
switch(e.getID()) {
case KeyEvent.KEY_PRESSED:
if (!isMousePressed){
keyPressed(e);
}
break;
}
}
void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode();
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine(e.toString());
}
switch(keyCode) {
case KeyEvent.VK_UP:
case KeyEvent.VK_KP_UP: // TODO: I assume we also want this, too
if (getFocusIndex() > 0) {
setFocusIndex(getFocusIndex()-1);
repaint(PAINT_HIDEFOCUS);
// If single-select, select the item
if (!multipleSelections) {
selectItem(getFocusIndex());
postEvent(new ItemEvent((List)target,
ItemEvent.ITEM_STATE_CHANGED,
Integer.valueOf(getFocusIndex()),
ItemEvent.SELECTED));
}
if (isItemHidden(getFocusIndex())) {
makeVisible(getFocusIndex());
}
else {
repaint(PAINT_FOCUS);
}
}
break;
case KeyEvent.VK_DOWN:
case KeyEvent.VK_KP_DOWN: // TODO: I assume we also want this, too
if (getFocusIndex() < items.size() - 1) {
setFocusIndex(getFocusIndex()+1);
repaint(PAINT_HIDEFOCUS);
// If single-select, select the item
if (!multipleSelections) {
selectItem(getFocusIndex());
postEvent(new ItemEvent((List)target,
ItemEvent.ITEM_STATE_CHANGED,
Integer.valueOf(getFocusIndex()),
ItemEvent.SELECTED));
}
if (isItemHidden(getFocusIndex())) {
makeVisible(getFocusIndex());
}
else {
repaint(PAINT_FOCUS);
}
}
break;
case KeyEvent.VK_PAGE_UP: {
// Assumes that scrollbar does its own bounds-checking
int previousValue = vsb.getValue();
vsb.setValue(vsb.getValue() - vsb.getBlockIncrement());
int currentValue = vsb.getValue();
// 6190768 pressing pg-up on AWT multiple selection lists the items but no item event is triggered, on XToolkit
// Restoring Motif behavior
if (previousValue!=currentValue) {
setFocusIndex(Math.max(getFocusIndex()-itemsInWindow(), 0));
if (!multipleSelections){
selectItem(getFocusIndex());
postEvent(new ItemEvent((List)target,
ItemEvent.ITEM_STATE_CHANGED,
Integer.valueOf(getFocusIndex()),
ItemEvent.SELECTED));
}
}
repaint();
break;
}
case KeyEvent.VK_PAGE_DOWN: {
// Assumes that scrollbar does its own bounds-checking
int previousValue = vsb.getValue();
vsb.setValue(vsb.getValue() + vsb.getBlockIncrement());
int currentValue = vsb.getValue();
// 6190768 pressing pg-down on AWT multiple selection list selects the items but no item event is triggered, on XToolkit
// Restoring Motif behavior
if (previousValue!=currentValue) {
setFocusIndex(Math.min(getFocusIndex() + itemsInWindow(), items.size()-1));
if (!multipleSelections){
selectItem(getFocusIndex());
postEvent(new ItemEvent((List)target,
ItemEvent.ITEM_STATE_CHANGED,
Integer.valueOf(getFocusIndex()),
ItemEvent.SELECTED));
}
}
repaint();
break;
}
case KeyEvent.VK_LEFT:
case KeyEvent.VK_KP_LEFT:
if (hsbVis & hsb.getValue() > 0) {
hsb.setValue(hsb.getValue() - HORIZ_SCROLL_AMT);
repaint();
}
break;
case KeyEvent.VK_RIGHT:
case KeyEvent.VK_KP_RIGHT:
if (hsbVis) { // Should check if already at end
hsb.setValue(hsb.getValue() + HORIZ_SCROLL_AMT);
repaint();
}
break;
// 6190778 CTRL + HOME, CTRL + END keys do not work properly for list on XToolkit
// Restoring Motif behavior
case KeyEvent.VK_HOME:
if (!e.isControlDown() || ((List)target).getItemCount() <= 0)
break;
if (vsbVis) {
vsb.setValue(vsb.getMinimum());
}
setFocusIndex(0);
if (!multipleSelections) {
selectItem(getFocusIndex());
postEvent(new ItemEvent((List)target,
ItemEvent.ITEM_STATE_CHANGED,
Integer.valueOf(getFocusIndex()),
ItemEvent.SELECTED));
}
repaint();
break;
case KeyEvent.VK_END:
if (!e.isControlDown() || ((List)target).getItemCount() <= 0)
break;
if (vsbVis) {
vsb.setValue(vsb.getMaximum());
}
setFocusIndex(items.size()-1);
if (!multipleSelections) {
selectItem(getFocusIndex());
postEvent(new ItemEvent((List)target,
ItemEvent.ITEM_STATE_CHANGED,
Integer.valueOf(getFocusIndex()),
ItemEvent.SELECTED));
}
repaint();
break;
case KeyEvent.VK_SPACE:
// Fixed 6299853: XToolkit: Pressing space triggers ItemStateChanged event after List.removeAll called
// If getFocusIndex() is less than 0, the event will not be triggered when space pressed
if (getFocusIndex() < 0 || ((List)target).getItemCount() <= 0) {
break;
}
boolean isSelected = isSelected(getFocusIndex());
// Spacebar only deselects for multi-select Lists
if (multipleSelections && isSelected) {
deselectItem(getFocusIndex());
postEvent(new ItemEvent((List)target,
ItemEvent.ITEM_STATE_CHANGED,
Integer.valueOf(getFocusIndex()),
ItemEvent.DESELECTED));
}
else if (!isSelected) { // Note: this changes the Solaris/Linux
// behavior to match that of win32.
// That is, pressing space bar on a
// single-select list when the focused
// item is already selected does NOT
// send an ItemEvent.SELECTED event.
selectItem(getFocusIndex());
postEvent(new ItemEvent((List)target,
ItemEvent.ITEM_STATE_CHANGED,
Integer.valueOf(getFocusIndex()),
ItemEvent.SELECTED));
}
break;
case KeyEvent.VK_ENTER:
// It looks to me like there are bugs as well as inconsistencies
// in the way the Enter key is handled by both Solaris and Windows.
// So for now in XAWT, I'm going to simply go by what the List docs
// say: "AWT also generates an action event when the user presses
// the return key while an item in the list is selected."
if (selected.length > 0) {
postEvent(new ActionEvent((List)target,
ActionEvent.ACTION_PERFORMED,
(String)items.elementAt(getFocusIndex()),
e.getWhen(),
e.getModifiers())); // ActionEvent doesn't have
// extended modifiers.
}
break;
}
}
/**
* return value from the scrollbar
*/
public void notifyValue(XScrollbar obj, int type, int v, boolean isAdjusting) {
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine("Notify value changed on " + obj + " to " + v);
}
int value = obj.getValue();
if (obj == vsb) {
scrollVertical(v - value);
// See 6243382 for more information
int oldSel = eventIndex;
int newSel = eventIndex+v-value;
if (mouseDraggedOutVertically && !isSelected(newSel)){
selectItem(newSel);
eventIndex = newSel;
repaint(oldSel, eventIndex, PAINT_ITEMS);
// Scrolling select() should also set the focus index
// Otherwise, the updating of the 'focusIndex' variable will be incorrect
// if user drag mouse out of the area of the list
setFocusIndex(newSel);
repaint(PAINT_FOCUS);
}
} else if ((XHorizontalScrollbar)obj == hsb) {
scrollHorizontal(v - value);
}
}
/**
* deselect all items in List
*/
private void deselectAllItems() {
selected = new int [0];
repaint(PAINT_ITEMS);
}
/**
* set multiple selections
*/
public void setMultipleSelections(boolean v) {
if (multipleSelections != v) {
if ( !v) {
int selPos = ( isSelected( focusIndex )) ? focusIndex: -1;
deselectAllItems();
if (selPos != -1){
selectItem(selPos);
}
}
multipleSelections = v;
}
}
/**
* add an item
* if the index of the item is < 0 or >= than items.size()
* then add the item to the end of the list
*/
public void addItem(String item, int i) {
int oldMaxLength = maxLength;
boolean hsbWasVis = hsbVis;
boolean vsbWasVis = vsbVis;
int addedIndex = 0; // Index where the new item ended up
if (i < 0 || i >= items.size()) {
i = -1;
}
// Why we set this variable to -1 in spite of the fact that selected[] is changed in other way?
// It's not clear how to reproduce incorrect behaviour based on this assignment
// since before using this variable (mouseReleased) we certainly update it to correct value
// So we don't modify this behaviour now
currentIndex = -1;
if (i == -1) {
items.addElement(item);
i = 0; // fix the math for the paintItems test
addedIndex = items.size() - 1;
} else {
items.insertElementAt(item, i);
addedIndex = i;
for (int j = 0 ; j < selected.length ; j++) {
if (selected[j] >= i) {
selected[j] += 1;
}
}
}
if (log.isLoggable(PlatformLogger.Level.FINER)) {
log.finer("Adding item '" + item + "' to " + addedIndex);
}
// Update maxLength
boolean repaintItems = !isItemHidden(addedIndex);
maxLength = Math.max(maxLength, getItemWidth(addedIndex));
layout();
int options = 0;
if (vsbVis != vsbWasVis || hsbVis != hsbWasVis) {
// Scrollbars are being added or removed, so we must repaint all
options = PAINT_ALL;
}
else {
options = (repaintItems ? (PAINT_ITEMS):0)
| ((maxLength != oldMaxLength || (hsbWasVis ^ hsbVis))?(PAINT_HSCROLL):0)
| ((vsb.needsRepaint())?(PAINT_VSCROLL):0);
}
if (log.isLoggable(PlatformLogger.Level.FINEST)) {
log.finest("Last visible: " + getLastVisibleItem() +
", hsb changed : " + (hsbWasVis ^ hsbVis) + ", items changed " + repaintItems);
}
repaint(addedIndex, getLastVisibleItem(), options);
}
/**
* delete items starting with s (start position) to e (end position) including s and e
* if s < 0 then s = 0
* if e >= items.size() then e = items.size() - 1
*/
public void delItems(int s, int e) {
// save the current state of the scrollbars
boolean hsbWasVisible = hsbVis;
boolean vsbWasVisible = vsbVis;
int oldLastDisplayed = lastItemDisplayed();
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine("Deleting from " + s + " to " + e);
}
if (log.isLoggable(PlatformLogger.Level.FINEST)) {
log.finest("Last displayed item: " + oldLastDisplayed + ", items in window " + itemsInWindow() +
", size " + items.size());
}
if (items.size() == 0) {
return;
}
// if user passed in flipped args, reverse them
if (s > e) {
int tmp = s;
s = e;
e = tmp;
}
// check for starting point less than zero
if (s < 0) {
s = 0;
}
// check for end point greater than the size of the list
if (e >= items.size()) {
e = items.size() - 1;
}
// determine whether we're going to delete any visible elements
// repaint must also be done if scrollbars appear/disappear, which
// can happen from removing a non-showing list item
/*
boolean repaintNeeded =
((s <= lastItemDisplayed()) && (e >= vsb.getValue()));
*/
boolean repaintNeeded = (s >= getFirstVisibleItem() && s <= getLastVisibleItem());
// delete the items out of the items list and out of the selected list
for (int i = s ; i <= e ; i++) {
items.removeElementAt(s);
int j = posInSel(i);
if (j != -1) {
int newsel[] = new int[selected.length - 1];
System.arraycopy(selected, 0, newsel, 0, j);
System.arraycopy(selected, j + 1, newsel, j, selected.length - (j + 1));
selected = newsel;
}
}
// update the indexes in the selected array
int diff = (e - s) + 1;
for (int i = 0 ; i < selected.length ; i++) {
if (selected[i] > e) {
selected[i] -= diff;
}
}
int options = PAINT_VSCROLL;
// focusedIndex updating according to native (Window, Motif) behaviour
if (getFocusIndex() > e) {
setFocusIndex(getFocusIndex() - (e - s + 1));
options |= PAINT_FOCUS;
} else if (getFocusIndex() >= s && getFocusIndex() <= e) {
// Fixed 6299858: PIT. Focused border not shown on List if selected item is removed, XToolkit
// We should set focus to new first item if the current first item was removed
// except if the list is empty
int focusBound = (items.size() > 0) ? 0 : -1;
setFocusIndex(Math.max(s-1, focusBound));
options |= PAINT_FOCUS;
}
if (log.isLoggable(PlatformLogger.Level.FINEST)) {
log.finest("Multiple selections: " + multipleSelections);
}
// update vsb.val
if (vsb.getValue() >= s) {
if (vsb.getValue() <= e) {
vsb.setValue(e+1 - diff);
} else {
vsb.setValue(vsb.getValue() - diff);
}
}
int oldMaxLength = maxLength;
maxLength = maxLength();
if (maxLength != oldMaxLength) {
// Width of the items changed affecting the range of
// horizontal scrollbar
options |= PAINT_HSCROLL;
}
layout();
repaintNeeded |= (vsbWasVisible ^ vsbVis) || (hsbWasVisible ^ hsbVis); // If scrollbars visibility changed
if (repaintNeeded) {
options |= PAINT_ALL;
}
repaint(s, oldLastDisplayed, options);
}
/**
* ListPeer method
*/
public void select(int index) {
// Programmatic select() should also set the focus index
setFocusIndex(index);
repaint(PAINT_FOCUS);
selectItem(index);
}
/**
* select the index
* redraw the list to the screen
*/
void selectItem(int index) {
// NOTE: instead of recalculating and the calling repaint(), painting
// is done immediately
// 6190746 List does not trigger ActionEvent when double clicking a programmatically selected item, XToolkit
// If we invoke select(int) before setVisible(boolean), then variable currentIndex will equals -1. At the same time isSelected may be true.
// Restoring Motif behavior
currentIndex = index;
if (isSelected(index)) {
return;
}
if (!multipleSelections) {
if (selected.length == 0) { // No current selection
selected = new int[1];
selected[0] = index;
}
else {
int oldSel = selected[0];
selected[0] = index;
if (!isItemHidden(oldSel)) {
// Only bother painting if item is visible (4895367)
repaint(oldSel, oldSel, PAINT_ITEMS);
}
}
} else {
// insert "index" into the selection array
int newsel[] = new int[selected.length + 1];
int i = 0;
while (i < selected.length && index > selected[i]) {
newsel[i] = selected[i];
i++;
}
newsel[i] = index;
System.arraycopy(selected, i, newsel, i+1, selected.length - i);
selected = newsel;
}
if (!isItemHidden(index)) {
// Only bother painting if item is visible (4895367)
repaint(index, index, PAINT_ITEMS);
}
}
/**
* ListPeer method
* focusedIndex isn't updated according to native (Window, Motif) behaviour
*/
public void deselect(int index) {
deselectItem(index);
}
/**
* deselect the index
* redraw the list to the screen
*/
void deselectItem(int index) {
if (!isSelected(index)) {
return;
}
if (!multipleSelections) {
// TODO: keep an int[0] and int[1] around and just use them instead
// creating new ones all the time
selected = new int[0];
} else {
int i = posInSel(index);
int newsel[] = new int[selected.length - 1];
System.arraycopy(selected, 0, newsel, 0, i);
System.arraycopy(selected, i+1, newsel, i, selected.length - (i+1));
selected = newsel;
}
currentIndex = index;
if (!isItemHidden(index)) {
// Only bother repainting if item is visible
repaint(index, index, PAINT_ITEMS);
}
}
/**
* ensure that the given index is visible, scrolling the List
* if necessary, or doing nothing if the item is already visible.
* The List must be repainted for changes to be visible.
*/
public void makeVisible(int index) {
if (index < 0 || index >= items.size()) {
return;
}
if (isItemHidden(index)) { // Do I really need to call this?
// If index is above the top, scroll up
if (index < vsb.getValue()) {
scrollVertical(index - vsb.getValue());
}
// If index is below the bottom, scroll down
else if (index > lastItemDisplayed()) {
int val = index - lastItemDisplayed();
scrollVertical(val);
}
}
}
/**
* clear
*/
public void clear() {
selected = new int[0];
items = new Vector();
currentIndex = -1;
// Fixed 6291736: ITEM_STATE_CHANGED triggered after List.removeAll(), XToolkit
// We should update 'focusIndex' variable more carefully
setFocusIndex(-1);
vsb.setValue(0);
maxLength = 0;
layout();
repaint();
}
/**
* return the selected indexes
*/
public int[] getSelectedIndexes() {
return selected;
}
/**
* return the y value of the given index "i".
* the y value represents the top of the text
* NOTE: index can be larger than items.size as long
* as it can fit the window
*/
int index2y(int index) {
int h = getItemHeight();
//if (index < vsb.getValue() || index > vsb.getValue() + itemsInWindow()) {
return MARGIN + ((index - vsb.getValue()) * h) + SPACE;
}
/* return true if the y is a valid y coordinate for
* a VISIBLE list item, otherwise returns false
*/
boolean validY(int y) {
int shown = itemsDisplayed();
int lastY = shown * getItemHeight() + MARGIN;
if (shown == itemsInWindow()) {
lastY += MARGIN;
}
if (y < 0 || y >= lastY) {
return false;
}
return true;
}
/**
* return the position of the index in the selected array
* if the index isn't in the array selected return -1;
*/
int posInSel(int index) {
for (int i = 0 ; i < selected.length ; i++) {
if (index == selected[i]) {
return i;
}
}
return -1;
}
boolean isIndexDisplayed(int idx) {
int lastDisplayed = lastItemDisplayed();
return idx <= lastDisplayed &&
idx >= Math.max(0, lastDisplayed - itemsInWindow() + 1);
}
/**
* returns index of last item displayed in the List
*/
int lastItemDisplayed() {
int n = itemsInWindow();
return (Math.min(items.size() - 1, (vsb.getValue() + n) - 1));
}
/**
* returns whether the given index is currently scrolled off the top or
* bottom of the List.
*/
boolean isItemHidden(int index) {
return index < vsb.getValue() ||
index >= vsb.getValue() + itemsInWindow();
}
/**
* returns the width of the list portion of the component (accounts for
* presence of vertical scrollbar)
*/
int getListWidth() {
return vsbVis ? width - SCROLLBAR_AREA : width;
}
/**
* returns number of items actually displayed in the List
*/
int itemsDisplayed() {
return (Math.min(items.size()-vsb.getValue(), itemsInWindow()));
}
/**
* scrollVertical
* y is the number of items to scroll
*/
void scrollVertical(int y) {
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine("Scrolling vertically by " + y);
}
int itemsInWin = itemsInWindow();
int h = getItemHeight();
int pixelsToScroll = y * h;
if (vsb.getValue() < -y) {
y = -vsb.getValue();
}
vsb.setValue(vsb.getValue() + y);
Rectangle source = null;
Point distance = null;
int firstItem = 0, lastItem = 0;
int options = PAINT_HIDEFOCUS | PAINT_ITEMS | PAINT_VSCROLL | PAINT_FOCUS;
if (y > 0) {
if (y < itemsInWin) {
source = new Rectangle(MARGIN, MARGIN + pixelsToScroll, width - SCROLLBAR_AREA, h * (itemsInWin - y - 1)-1);
distance = new Point(0, -pixelsToScroll);
options |= COPY_AREA;
}
firstItem = vsb.getValue() + itemsInWin - y - 1;
lastItem = vsb.getValue() + itemsInWin - 1;
} else if (y < 0) {
if (y + itemsInWindow() > 0) {
source = new Rectangle(MARGIN, MARGIN, width - SCROLLBAR_AREA, h * (itemsInWin + y));
distance = new Point(0, -pixelsToScroll);
options |= COPY_AREA;
}
firstItem = vsb.getValue();
lastItem = Math.min(getLastVisibleItem(), vsb.getValue() + -y);
}
repaint(firstItem, lastItem, options, source, distance);
}
/**
* scrollHorizontal
* x is the number of pixels to scroll
*/
void scrollHorizontal(int x) {
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine("Scrolling horizontally by " + y);
}
int w = getListWidth();
w -= ((2 * SPACE) + (2 * MARGIN));
int h = height - (SCROLLBAR_AREA + (2 * MARGIN));
hsb.setValue(hsb.getValue() + x);
int options = PAINT_ITEMS | PAINT_HSCROLL;
Rectangle source = null;
Point distance = null;
if (x < 0) {
source = new Rectangle(MARGIN + SPACE, MARGIN, w + x, h);
distance = new Point(-x, 0);
options |= COPY_AREA;
} else if (x > 0) {
source = new Rectangle(MARGIN + SPACE + x, MARGIN, w - x, h);
distance = new Point(-x, 0);
options |= COPY_AREA;
}
repaint(vsb.getValue(), lastItemDisplayed(), options, source, distance);
}
/**
* return the index
*/
int y2index(int y) {
if (!validY(y)) {
return -1;
}
int i = (y - MARGIN) / getItemHeight() + vsb.getValue();
int last = lastItemDisplayed();
if (i > last) {
i = last;
}
return i;
}
/**
* is the index "index" selected
*/
boolean isSelected(int index) {
if (eventType == ItemEvent.SELECTED && index == eventIndex) {
return true;
}
for (int i = 0 ; i < selected.length ; i++) {
if (selected[i] == index) {
return true;
}
}
return false;
}
/**
* return the number of items that can fit
* in the current window
*/
int itemsInWindow(boolean scrollbarVisible) {
int h;
if (scrollbarVisible) {
h = height - ((2 * MARGIN) + SCROLLBAR_AREA);
} else {
h = height - 2*MARGIN;
}
return (h / getItemHeight());
}
int itemsInWindow() {
return itemsInWindow(hsbVis);
}
/**
* return true if the x and y position is in the horizontal scrollbar
*/
boolean inHorizontalScrollbar(int x, int y) {
int w = getListWidth();
int h = height - SCROLLBAR_WIDTH;
return (hsbVis && (x >= 0) && (x <= w) && (y > h));
}
/**
* return true if the x and y position is in the verticalscrollbar
*/
boolean inVerticalScrollbar(int x, int y) {
int w = width - SCROLLBAR_WIDTH;
int h = hsbVis ? height - SCROLLBAR_AREA : height;
return (vsbVis && (x > w) && (y >= 0) && (y <= h));
}
/**
* return true if the x and y position is in the window
*/
boolean inWindow(int x, int y) {
int w = getListWidth();
int h = hsbVis ? height - SCROLLBAR_AREA : height;
return ((x >= 0) && (x <= w)) && ((y >= 0) && (y <= h));
}
/**
* return true if vertical scrollbar is visible and false otherwise;
* hsbVisible is the visibility of the horizontal scrollbar
*/
boolean vsbIsVisible(boolean hsbVisible){
return (items.size() > itemsInWindow(hsbVisible));
}
/**
* return true if horizontal scrollbar is visible and false otherwise;
* vsbVisible is the visibility of the vertical scrollbar
*/
boolean hsbIsVisible(boolean vsbVisible){
int w = width - ((2*SPACE) + (2*MARGIN) + (vsbVisible ? SCROLLBAR_AREA : 0));
return (maxLength > w);
}
/*
* Returns true if the event has been handled and should not be
* posted to Java
*/
boolean prePostEvent(final AWTEvent e) {
if (e instanceof MouseEvent) {
return prePostMouseEvent((MouseEvent)e);
}
return super.prePostEvent(e);
}
/*
* Fixed 6240151: XToolkit: Dragging the List scrollbar initiates DnD
* To be compatible with Motif, MouseEvent originated on the scrollbar
* should be sent into Java in this way:
* - post: MOUSE_ENTERED, MOUSE_EXITED, MOUSE_MOVED
* - don't post: MOUSE_PRESSED, MOUSE_RELEASED, MOUSE_CLICKED, MOUSE_DRAGGED
*/
boolean prePostMouseEvent(final MouseEvent me){
if (getToplevelXWindow().isModalBlocked()) {
return false;
}
int eventId = me.getID();
if (eventId == MouseEvent.MOUSE_MOVED)
{
// only for performance improvement
}else if((eventId == MouseEvent.MOUSE_DRAGGED ||
eventId == MouseEvent.MOUSE_RELEASED) &&
isScrollBarOriginated)
{
if (eventId == MouseEvent.MOUSE_RELEASED) {
isScrollBarOriginated = false;
}
handleJavaMouseEventOnEDT(me);
return true;
}else if ((eventId == MouseEvent.MOUSE_PRESSED ||
eventId == MouseEvent.MOUSE_CLICKED) &&
(inVerticalScrollbar(me.getX(), me.getY()) ||
inHorizontalScrollbar(me.getX(), me.getY())))
{
if (eventId == MouseEvent.MOUSE_PRESSED) {
isScrollBarOriginated = true;
}
handleJavaMouseEventOnEDT(me);
return true;
}
return false;
}
/*
* Do handleJavaMouseEvent on EDT
*/
void handleJavaMouseEventOnEDT(final MouseEvent me){
InvocationEvent ev = new InvocationEvent(target, new Runnable() {
public void run() {
handleJavaMouseEvent(me);
}
});
postEvent(ev);
}
/*
* Fixed 5010944: List's rows overlap one another
* The bug is due to incorrent caching of the list item size
* So we should recalculate font metrics on setFont
*/
public void setFont(Font f) {
if (!Objects.equals(getFont(), f)) {
super.setFont(f);
initFontMetrics();
layout();
repaint();
}
}
/**
* Sometimes painter is called on Toolkit thread, so the lock sequence is:
* awtLock -> Painter -> awtLock
* Sometimes it is called on other threads:
* Painter -> awtLock
* Since we can't guarantee the sequence, use awtLock.
*/
class ListPainter {
VolatileImage buffer;
Color[] colors;
private Color getListForeground() {
if (fgColorSet) {
return colors[FOREGROUND_COLOR];
}
else {
return SystemColor.textText;
}
}
private Color getListBackground() {
if (bgColorSet) {
return colors[BACKGROUND_COLOR];
}
else {
return SystemColor.text;
}
}
private Color getDisabledColor() {
Color backgroundColor = getListBackground();
Color foregroundColor = getListForeground();
return (backgroundColor.equals(Color.BLACK)) ? foregroundColor.darker() : backgroundColor.darker();
}
private boolean createBuffer() {
VolatileImage localBuffer = null;
XToolkit.awtLock();
try {
localBuffer = buffer;
} finally {
XToolkit.awtUnlock();
}
if (localBuffer == null) {
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine("Creating buffer " + width + "x" + height);
}
// use GraphicsConfig.cCVI() instead of Component.cVI(),
// because the latter may cause a deadlock with the tree lock
localBuffer =
graphicsConfig.createCompatibleVolatileImage(width+1,
height+1);
}
XToolkit.awtLock();
try {
if (buffer == null) {
buffer = localBuffer;
return true;
}
} finally {
XToolkit.awtUnlock();
}
return false;
}
public void invalidate() {
XToolkit.awtLock();
try {
if (buffer != null) {
buffer.flush();
}
buffer = null;
} finally {
XToolkit.awtUnlock();
}
}
private void paint(Graphics listG, int firstItem, int lastItem, int options) {
paint(listG, firstItem, lastItem, options, null, null);
}
private void paint(Graphics listG, int firstItem, int lastItem, int options,
Rectangle source, Point distance) {
if (log.isLoggable(PlatformLogger.Level.FINER)) {
log.finer("Repaint from " + firstItem + " to " + lastItem + " options " + options);
}
if (firstItem > lastItem) {
int t = lastItem;
lastItem = firstItem;
firstItem = t;
}
if (firstItem < 0) {
firstItem = 0;
}
colors = getGUIcolors();
VolatileImage localBuffer = null;
do {
XToolkit.awtLock();
try {
if (createBuffer()) {
// First time created buffer should be painted over at full.
options = PAINT_ALL;
}
localBuffer = buffer;
} finally {
XToolkit.awtUnlock();
}
switch (localBuffer.validate(getGraphicsConfiguration())) {
case VolatileImage.IMAGE_INCOMPATIBLE:
invalidate();
options = PAINT_ALL;
continue;
case VolatileImage.IMAGE_RESTORED:
options = PAINT_ALL;
}
Graphics g = localBuffer.createGraphics();
// Note that the order of the following painting operations
// should not be modified
try {
g.setFont(getFont());
// hiding the focus rectangle must be done prior to copying
// area and so this is the first action to be performed
if ((options & (PAINT_HIDEFOCUS)) != 0) {
paintFocus(g, PAINT_HIDEFOCUS);
}
/*
* The shift of the component contents occurs while someone
* scrolls the component, the only purpose of the shift is to
* increase the painting performance. The shift should be done
* prior to painting any area (except hiding focus) and actually
* it should never be done jointly with erase background.
*/
if ((options & COPY_AREA) != 0) {
g.copyArea(source.x, source.y, source.width, source.height,
distance.x, distance.y);
}
if ((options & PAINT_BACKGROUND) != 0) {
paintBackground(g);
// Since we made full erase update items
firstItem = getFirstVisibleItem();
lastItem = getLastVisibleItem();
}
if ((options & PAINT_ITEMS) != 0) {
paintItems(g, firstItem, lastItem, options);
}
if ((options & PAINT_VSCROLL) != 0 && vsbVis) {
g.setClip(getVScrollBarRec());
paintVerScrollbar(g, true);
}
if ((options & PAINT_HSCROLL) != 0 && hsbVis) {
g.setClip(getHScrollBarRec());
paintHorScrollbar(g, true);
}
if ((options & (PAINT_FOCUS)) != 0) {
paintFocus(g, PAINT_FOCUS);
}
} finally {
g.dispose();
}
} while (localBuffer.contentsLost());
listG.drawImage(localBuffer, 0, 0, null);
}
private void paintBackground(Graphics g) {
g.setColor(SystemColor.window);
g.fillRect(0, 0, width, height);
g.setColor(getListBackground());
g.fillRect(0, 0, listWidth, listHeight);
draw3DRect(g, getSystemColors(), 0, 0, listWidth - 1, listHeight - 1, false);
}
private void paintItems(Graphics g, int firstItem, int lastItem, int options) {
if (log.isLoggable(PlatformLogger.Level.FINER)) {
log.finer("Painting items from " + firstItem + " to " + lastItem + ", focused " + focusIndex + ", first " + getFirstVisibleItem() + ", last " + getLastVisibleItem());
}
firstItem = Math.max(getFirstVisibleItem(), firstItem);
if (firstItem > lastItem) {
int t = lastItem;
lastItem = firstItem;
firstItem = t;
}
firstItem = Math.max(getFirstVisibleItem(), firstItem);
lastItem = Math.min(lastItem, items.size()-1);
if (log.isLoggable(PlatformLogger.Level.FINER)) {
log.finer("Actually painting items from " + firstItem + " to " + lastItem +
", items in window " + itemsInWindow());
}
for (int i = firstItem; i <= lastItem; i++) {
paintItem(g, i);
}
}
private void paintItem(Graphics g, int index) {
if (log.isLoggable(PlatformLogger.Level.FINEST)) {
log.finest("Painting item " + index);
}
// 4895367 - only paint items which are visible
if (!isItemHidden(index)) {
Shape clip = g.getClip();
int w = getItemWidth();
int h = getItemHeight();
int y = getItemY(index);
int x = getItemX();
if (log.isLoggable(PlatformLogger.Level.FINEST)) {
log.finest("Setting clip " + new Rectangle(x, y, w - (SPACE*2), h-(SPACE*2)));
}
g.setClip(x, y, w - (SPACE*2), h-(SPACE*2));
// Always paint the background so that focus is unpainted in
// multiselect mode
if (isSelected(index)) {
if (log.isLoggable(PlatformLogger.Level.FINEST)) {
log.finest("Painted item is selected");
}
g.setColor(getListForeground());
} else {
g.setColor(getListBackground());
}
if (log.isLoggable(PlatformLogger.Level.FINEST)) {
log.finest("Filling " + new Rectangle(x, y, w, h));
}
g.fillRect(x, y, w, h);
if (index <= getLastVisibleItem() && index < items.size()) {
if (!isEnabled()){
g.setColor(getDisabledColor());
} else if (isSelected(index)) {
g.setColor(getListBackground());
} else {
g.setColor(getListForeground());
}
String str = (String)items.elementAt(index);
g.drawString(str, x - hsb.getValue(), y + fontAscent);
} else {
// Clear the remaining area around the item - focus area and the rest of border
g.setClip(x, y, listWidth, h);
g.setColor(getListBackground());
g.fillRect(x, y, listWidth, h);
}
g.setClip(clip);
}
}
void paintScrollBar(XScrollbar scr, Graphics g, int x, int y, int width, int height, boolean paintAll) {
if (log.isLoggable(PlatformLogger.Level.FINEST)) {
log.finest("Painting scrollbar " + scr + " width " +
width + " height " + height + ", paintAll " + paintAll);
}
g.translate(x, y);
scr.paint(g, getSystemColors(), paintAll);
g.translate(-x, -y);
}
/**
* Paint the horizontal scrollbar to the screen
*
* @param g the graphics context to draw into
* @param colors the colors used to draw the scrollbar
* @param paintAll paint the whole scrollbar if true, just the thumb if false
*/
void paintHorScrollbar(Graphics g, boolean paintAll) {
int w = getListWidth();
paintScrollBar(hsb, g, 0, height - (SCROLLBAR_WIDTH), w, SCROLLBAR_WIDTH, paintAll);
}
/**
* Paint the vertical scrollbar to the screen
*
* @param g the graphics context to draw into
* @param colors the colors used to draw the scrollbar
* @param paintAll paint the whole scrollbar if true, just the thumb if false
*/
void paintVerScrollbar(Graphics g, boolean paintAll) {
int h = height - (hsbVis ? (SCROLLBAR_AREA-2) : 0);
paintScrollBar(vsb, g, width - SCROLLBAR_WIDTH, 0, SCROLLBAR_WIDTH - 2, h, paintAll);
}
private Rectangle prevFocusRect;
private void paintFocus(Graphics g, int options) {
boolean paintFocus = (options & PAINT_FOCUS) != 0;
if (paintFocus && !hasFocus()) {
paintFocus = false;
}
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine("Painting focus, focus index " + getFocusIndex() + ", focus is " +
(isItemHidden(getFocusIndex())?("invisible"):("visible")) + ", paint focus is " + paintFocus);
}
Shape clip = g.getClip();
g.setClip(0, 0, listWidth, listHeight);
if (log.isLoggable(PlatformLogger.Level.FINEST)) {
log.finest("Setting focus clip " + new Rectangle(0, 0, listWidth, listHeight));
}
Rectangle rect = getFocusRect();
if (prevFocusRect != null) {
// Erase focus rect
if (log.isLoggable(PlatformLogger.Level.FINEST)) {
log.finest("Erasing previous focus rect " + prevFocusRect);
}
g.setColor(getListBackground());
g.drawRect(prevFocusRect.x, prevFocusRect.y, prevFocusRect.width, prevFocusRect.height);
prevFocusRect = null;
}
if (paintFocus) {
// Paint new
if (log.isLoggable(PlatformLogger.Level.FINEST)) {
log.finest("Painting focus rect " + rect);
}
g.setColor(getListForeground()); // Focus color is always black on Linux
g.drawRect(rect.x, rect.y, rect.width, rect.height);
prevFocusRect = rect;
}
g.setClip(clip);
}
}
}
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