| /* |
| * Copyright (c) 1999, 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. |
| * |
| * 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 test.java.awt.event.helpers.lwcomponents; |
| |
| import java.awt.*; |
| import java.awt.event.*; |
| import java.util.Vector; |
| import java.util.Enumeration; |
| |
| /** |
| * Remarks : Source for LightWeight component - List. |
| * |
| * Scroll bar support is not available for this component, so if the |
| * items exceeds visibility those items will be truncated. Also, here |
| * double buffering is not used so there will be little bit flickering |
| * while it repaints. Item listener support is not enabled in this |
| * component. Listeners handled were Mouse, Key and Focus. |
| * |
| * @author R.Govindarajan (govind@siptech.co.in), G.N.V.Sekhar (sekharv@siptech.co.in) |
| */ |
| |
| public class LWList extends LWComponent implements ItemSelectable { |
| |
| // Constants used for component size |
| private final int MIN_WIDTH = 100; |
| private final int MIN_HEIGHT = 100; |
| private final int PREF_WIDTH = 100; |
| private final int PREF_HEIGHT = 100; |
| |
| // Constants used for setting color for component |
| private final Color BACK_COLOR = Color.white; |
| private final Color FRONT_COLOR = Color.black; |
| private final Color BORDER_COLOR = Color.darkGray; |
| private final Color FOCUS_COLOR = Color.blue; |
| private final Color FOCUS_FORECOLOR = Color.white; |
| private final Color FOCUS_ENABLED_COLOR = Color.red; |
| private final int BORDER_WIDTH = 2; |
| |
| private Vector stringList; // List of items |
| private Vector selList; // List of selected items |
| private int rows; // Visible rows |
| private int focusIndex, prevfocusIndex; |
| private Dimension minSize; |
| private Dimension prefSize; |
| private boolean pressed, eventOccurred, focusEnabled; |
| private boolean multipleMode; |
| |
| // Listeners handled for this component |
| private ActionListener actionListener; |
| private KeyListener keyListener; |
| private FocusListener focusListener; |
| private ItemListener itemListener; |
| |
| private static int nameCounter = 0; |
| |
| /** |
| * Creates a new list. |
| */ |
| public LWList() { |
| this(0); |
| } |
| |
| /** |
| * Creates a new list with the specified number of rows; |
| * multiple selection mode is disabled. |
| * |
| * @param i the number of rows |
| */ |
| public LWList(int i) { |
| this(i, false); |
| } |
| |
| /** |
| * Creates a new list with the specified number of rows and multiple selection mode. |
| * |
| * @param rows the number of rows |
| * @param flag determines whether the list allows multiple selections |
| */ |
| public LWList(int rows, boolean flag) { |
| multipleMode = flag; |
| this.rows = rows; |
| minSize = new Dimension(MIN_WIDTH, MIN_HEIGHT); |
| prefSize = new Dimension(PREF_WIDTH, PREF_HEIGHT); |
| stringList = new Vector(); |
| selList = new Vector(); |
| selList.addElement(0); |
| focusIndex = -1; |
| prevfocusIndex = focusIndex; |
| enableEvents(AWTEvent.MOUSE_EVENT_MASK); |
| enableEvents(AWTEvent.KEY_EVENT_MASK); |
| enableEvents(AWTEvent.FOCUS_EVENT_MASK); |
| enableEvents(AWTEvent.ITEM_EVENT_MASK); |
| setName(makeComponentName()); // set the name to the component |
| } |
| |
| String makeComponentName() { |
| String s = "LWList" + nameCounter++; |
| return s; |
| } |
| |
| /** |
| * Set whether the component is enabled or not. |
| * @param enabled if {@code true}, the component is to be enabled |
| */ |
| @Override |
| public void setEnabled(boolean enabled) { |
| super.setEnabled(enabled); |
| |
| if (enabled) { |
| enableEvents(AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK); |
| } else { |
| disableEvents(AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK); |
| } |
| repaint(1); |
| } |
| |
| /** |
| * Set the selection mode. |
| * |
| * @param flag determines whether the list allows multiple selections |
| */ |
| public void setSelectionMode(boolean flag) { |
| multipleMode = flag; |
| } |
| |
| /** |
| * Check if the list allows multiple selections. |
| * |
| * @return {@code true} if the list allows multiple selections |
| */ |
| public boolean isMultipleMode() { |
| return multipleMode; |
| } |
| |
| /** |
| * Add the specified item. |
| * |
| * @param listItem the item |
| */ |
| public void add(String listItem) { |
| stringList.addElement(listItem); |
| invalidate(); |
| repaint(); |
| } |
| |
| /** |
| * Get minimum dimension for the list. |
| * |
| * @return the minimum dimensions for displaying |
| */ |
| @Override |
| public Dimension getMinimumSize() { |
| return minSize; |
| } |
| |
| /** |
| * Get the preferred size of the list. |
| * |
| * @return the preferred dimensions for displaying |
| */ |
| @Override |
| public Dimension getPreferredSize() { |
| return prefSize; |
| } |
| |
| /** |
| * Get the background color for the component. |
| * |
| * @return the background color for the component |
| */ |
| @Override |
| public Color getBackground() { |
| return BACK_COLOR; |
| } |
| |
| /** |
| * Get the foreground color for the component. |
| * |
| * @return the foreground color for the component |
| */ |
| @Override |
| public Color getForeground() { |
| return FRONT_COLOR; |
| } |
| |
| /** |
| * Get the border color for the component. |
| * |
| * @return the border color for the component |
| */ |
| public Color getBorder() { |
| return BORDER_COLOR; |
| } |
| |
| /** |
| * Get background color for the selected item. |
| * |
| * @return the color for the selected item |
| */ |
| public Color getFocusColor() { |
| return FOCUS_COLOR; |
| } |
| |
| /** |
| * Get foreground color for the selected item. |
| * |
| * @return the foreground color for the selected item |
| */ |
| public Color getFocusForeColor() { |
| return FOCUS_FORECOLOR; |
| } |
| |
| /** |
| * Get a "focus enabled" color - a small rectangle around the item |
| * should be drawn when the component got the focus. |
| * |
| * @return the "focus enabled" color |
| */ |
| public Color getFocusEnabledColor() { |
| return FOCUS_ENABLED_COLOR; |
| } |
| |
| /** |
| * Get border width. |
| * |
| * @return the border width |
| */ |
| public int getBorderWidth() { |
| return BORDER_WIDTH; |
| } |
| |
| /** |
| * Get the list item count. |
| * |
| * @return the count of items |
| */ |
| public int getItemCount() { |
| return stringList.size(); |
| } |
| |
| /** |
| * Get the specified item from the list. |
| * |
| * @param index the index |
| * @return the item string |
| */ |
| public String getItem(int index) { |
| return (String)stringList.elementAt(index); |
| } |
| |
| /** |
| * Get array of items from the list. |
| * |
| * @return the array of item strings |
| */ |
| public String[] getItems() { |
| String str[] = new String[getItemCount()]; |
| int count = 0; |
| for (Enumeration e = stringList.elements(); e.hasMoreElements(); ) { |
| str[count++] = (String)e.nextElement(); |
| } |
| return str; |
| } |
| |
| /** |
| * Check whether the component can be a focus owner (explicitly enabled here). |
| * |
| * @return {@code true} if the component is focusable |
| */ |
| @Override |
| public boolean isFocusTraversable() { |
| return true; |
| } |
| |
| /** |
| * Check whether mouse click point lies within the list of items. |
| * |
| * @param pt the click point |
| * @return {@code true} if the click point lies within the list of items |
| */ |
| @Override |
| public boolean contains(Point pt) { |
| Rectangle rect = new Rectangle(); |
| Dimension d = getSize(); |
| rect.x = getBorderWidth(); |
| rect.y = getBorderWidth(); |
| rect.width = d.width - (getBorderWidth() * 2); |
| rect.height = d.height - (getBorderWidth() * 2); |
| return rect.contains(pt); |
| } |
| |
| /** |
| * Given a click point the item that has to be selected is found from the list |
| * and focusIndex variable is set accordingly. |
| * |
| * @param pt the click point |
| */ |
| private void findSelectedIndex(Point pt) { |
| Font f = getFont(); |
| FontMetrics fm = getFontMetrics(f); |
| focusIndex = pt.y / fm.getHeight() - 1; |
| if (multipleMode) { |
| Integer fi = focusIndex; |
| if (selList.contains(fi)) { |
| int i = selList.indexOf(fi); |
| selList.removeElementAt(i); |
| } else { |
| selList.addElement(fi); |
| } |
| } |
| } |
| |
| /** |
| * Set index of the selected item. |
| * |
| * @param index the index |
| */ |
| public void setSelectedIndex(int index) { |
| prevfocusIndex = focusIndex; |
| focusIndex = index; |
| } |
| |
| /** |
| * Get the selected item index. |
| * |
| * @return the selected item index. |
| */ |
| public int getSelectedIndex() { |
| return focusIndex; |
| } |
| |
| /** |
| * Get an array of the selected Objects. |
| * |
| * @return array of the Objects |
| */ |
| @Override |
| public Object[] getSelectedObjects() { |
| int ai[] = getSelectedIndexes(); |
| Object aobj[] = new Object[selList.size()]; |
| for (int i = 0; i < selList.size(); i++) { |
| aobj[i] = stringList.elementAt(ai[i]); |
| } |
| return aobj; |
| } |
| |
| /** |
| * Get an array of the selected item indices. |
| * |
| * @return the array of the indices |
| */ |
| public int[] getSelectedIndexes() { |
| int ai[] = new int[selList.size()]; |
| for (int i = 0; i < selList.size(); i++) { |
| ai[i] = ((Integer)selList.elementAt(i)); |
| } |
| return ai; |
| } |
| |
| /** |
| * Add the specified item listener to receive item events from the list. |
| * |
| * @param itemlistener the item listener |
| */ |
| @Override |
| public synchronized void addItemListener(ItemListener itemlistener) { |
| itemListener = AWTEventMulticaster.add(itemListener, itemlistener); |
| enableEvents(AWTEvent.ITEM_EVENT_MASK); |
| } |
| |
| /** |
| * Remove the specified item listener so |
| * that it no longer receives item events from this list. |
| * |
| * @param itemlistener the item listener |
| */ |
| @Override |
| public synchronized void removeItemListener(ItemListener itemlistener) { |
| itemListener = AWTEventMulticaster.remove(itemListener, itemlistener); |
| } |
| |
| /** |
| * Add the specified action listener to receive action events from this list. |
| * |
| * @param listener the action listener |
| */ |
| public synchronized void addActionListener(ActionListener listener) { |
| actionListener = AWTEventMulticaster.add(actionListener, listener); |
| enableEvents(AWTEvent.MOUSE_EVENT_MASK); |
| } |
| |
| /** |
| * Remove the specified action listener so |
| * that it no longer receives action events from this list. |
| * |
| * @param listener the action listener |
| */ |
| public synchronized void removeActionListener(ActionListener listener) { |
| actionListener = AWTEventMulticaster.remove(actionListener, listener); |
| } |
| |
| /** |
| * Add the specified key listener to receive key events from this component. |
| * |
| * @param listener the key listener |
| */ |
| @Override |
| public synchronized void addKeyListener(KeyListener listener) { |
| keyListener = AWTEventMulticaster.add(keyListener, listener); |
| enableEvents(AWTEvent.KEY_EVENT_MASK); |
| } |
| |
| /** |
| * Remove the specified key listener so |
| * that it no longer receives key events from this component. |
| * |
| * @param listener the key listener |
| */ |
| @Override |
| public synchronized void removeKeyListener(KeyListener listener) { |
| keyListener = AWTEventMulticaster.remove(keyListener, listener); |
| } |
| |
| /** |
| * Add the specified focus listener to receive focus events |
| * from this component when it gains input focus. |
| * |
| * @param listener the focus listener |
| */ |
| @Override |
| public synchronized void addFocusListener(FocusListener listener) { |
| focusListener = AWTEventMulticaster.add(focusListener, listener); |
| enableEvents(AWTEvent.FOCUS_EVENT_MASK); |
| } |
| |
| /** |
| * Remove the specified focus listener so |
| * that it no longer receives focus events from this component. |
| * |
| * @param listener the focus listener |
| */ |
| @Override |
| public synchronized void removeFocusListener(FocusListener listener) { |
| focusListener = AWTEventMulticaster.remove(focusListener, listener); |
| } |
| |
| @Override |
| protected void processEvent(AWTEvent awtevent) { |
| |
| if (awtevent instanceof FocusEvent) { |
| processFocusEvent((FocusEvent)awtevent); |
| } else if (awtevent instanceof ItemEvent) { |
| processItemEvent((ItemEvent)awtevent); |
| } else if (awtevent instanceof KeyEvent) { |
| processKeyEvent((KeyEvent)awtevent); |
| } else if (awtevent instanceof MouseEvent) { |
| switch (awtevent.getID()) { |
| case MouseEvent.MOUSE_CLICKED: |
| case MouseEvent.MOUSE_PRESSED: |
| case MouseEvent.MOUSE_RELEASED: |
| case MouseEvent.MOUSE_ENTERED: |
| case MouseEvent.MOUSE_EXITED: |
| processMouseEvent((MouseEvent)awtevent); |
| break; |
| |
| case MouseEvent.MOUSE_MOVED: |
| case MouseEvent.MOUSE_DRAGGED: |
| super.processEvent((MouseEvent)awtevent); |
| break; |
| } |
| } else { |
| if (awtevent instanceof ComponentEvent) |
| super.processComponentEvent((ComponentEvent)awtevent); |
| else |
| super.processEvent(awtevent); |
| } |
| } |
| |
| protected void processItemEvent(ItemEvent itemevent) { |
| if (itemListener != null) { |
| itemListener.itemStateChanged(itemevent); |
| } |
| } |
| |
| @Override |
| protected void processFocusEvent(FocusEvent e) { |
| switch (e.getID()) { |
| case FocusEvent.FOCUS_GAINED: |
| if (focusListener != null) { focusListener.focusGained(e); } |
| if (getSelectedIndex() == -1) { setSelectedIndex(0); } |
| focusEnabled = true; |
| repaint(); |
| break; |
| case FocusEvent.FOCUS_LOST: |
| if (focusListener != null) { |
| focusListener.focusLost(e); |
| } |
| focusEnabled = false; |
| repaint(); |
| break; |
| } |
| super.processFocusEvent(e); |
| } |
| |
| @Override |
| protected void processKeyEvent(KeyEvent e) { |
| rows = getItemCount(); |
| |
| switch (e.getID()) { |
| |
| case KeyEvent.KEY_TYPED: |
| if (keyListener != null) { |
| keyListener.keyTyped(e); |
| } |
| break; |
| |
| case KeyEvent.KEY_PRESSED: |
| if (keyListener != null) { |
| keyListener.keyPressed(e); |
| } |
| if (e.getKeyCode() == KeyEvent.VK_DOWN) { |
| prevfocusIndex = focusIndex; |
| int index = getSelectedIndex() + 1; |
| if (index > rows) { break; } |
| setSelectedIndex(index); |
| processItemEvent(new ItemEvent(this, 0, index, 0)); |
| eventOccurred = true; |
| repaint(); |
| } else if (e.getKeyCode() == KeyEvent.VK_UP) { |
| int index = getSelectedIndex()-1; |
| if (index >= 0) { |
| setSelectedIndex(index); |
| if (e.getID() != 400) { |
| processItemEvent(new ItemEvent(this, 0, index, 0)); |
| } |
| eventOccurred = true; |
| repaint(); |
| } |
| } |
| break; |
| |
| case KeyEvent.KEY_RELEASED: |
| if (keyListener != null) { |
| keyListener.keyReleased(e); |
| } |
| if (e.getKeyCode() == KeyEvent.VK_ENTER) { |
| eventOccurred = true; |
| |
| // ActionEvent is fired here |
| if (actionListener != null) { |
| actionListener.actionPerformed( new ActionEvent( |
| this, ActionEvent.ACTION_PERFORMED, null)); |
| } |
| repaint(); |
| } |
| break; |
| } // switch |
| super.processKeyEvent(e); |
| } |
| |
| @Override |
| protected void processMouseEvent(MouseEvent e) { |
| switch (e.getID()) { |
| case MouseEvent.MOUSE_PRESSED: |
| pressed = true; |
| if (contains(e.getPoint())) { |
| findSelectedIndex(e.getPoint()); |
| processItemEvent(new ItemEvent(this, 0, focusIndex, 0)); |
| eventOccurred = true; |
| } |
| repaint(); |
| break; |
| |
| case MouseEvent.MOUSE_RELEASED: |
| if (pressed) { requestFocus(); } |
| |
| if (contains(e.getPoint())) { |
| findSelectedIndex(e.getPoint()); |
| eventOccurred = true; |
| } |
| // ActionEvent is fired here |
| if (actionListener != null) { |
| actionListener.actionPerformed(new ActionEvent( |
| this, ActionEvent.ACTION_PERFORMED, null)); |
| } |
| |
| if (pressed) { |
| pressed = false; |
| repaint(); |
| } |
| break; |
| } |
| super.processMouseEvent(e); |
| } |
| |
| @Override |
| /** |
| * Paint the list. |
| * |
| * @param g the graphics context to be used for testing |
| */ |
| public void paint(Graphics g) { |
| super.paint(g); |
| restrictGraphicsToClientArea(g); |
| |
| Point loc = getClientLocation(); |
| Dimension dim = getClientSize(); |
| Color prevColor = g.getColor(); |
| |
| // List border is drawn here |
| g.setColor(getBackground()); |
| g.fillRect(0, 0, dim.width - 2, dim.height - 2); |
| g.setColor(getBorder()); |
| g.drawRect(0, 0, dim.width - 2, dim.height - 2); |
| |
| if (getItemCount() > 0) { |
| Font f = getFont(); |
| if (f != null) { |
| String str[] = getItems(); |
| FontMetrics fm = getFontMetrics(f); |
| int drawRow = loc.x + getBorderWidth() + fm.getAscent(); |
| int drawCol = loc.y + getBorderWidth(); |
| int rectRow = loc.y + getBorderWidth(); |
| int i = 0; |
| |
| // Draw items (if the items exceeds visibility those items will be truncated |
| // as scrollbar support is not enabled |
| |
| for (; |
| i < str.length && drawRow < (dim.height - getBorderWidth()); |
| i++) { |
| if (fm.stringWidth(str[i]) < (dim.width - (getBorderWidth() * 2))) { |
| drawItem(g, i, drawCol, drawRow, rectRow, fm); |
| drawRow += fm.getHeight(); |
| rectRow += fm.getHeight(); |
| } else { |
| LWComponent.errorMsg("string width exceeds list width"); |
| LWComponent.errorMsg("Horizontal scrollbar support is not available"); |
| } |
| } // for |
| |
| if ( (drawRow > (dim.height - getBorderWidth())) && (str.length > i) ) { |
| //LWComponent.errorMsg("no of strings exceeds list height"); |
| //LWComponent.errorMsg("Vertical scrollbar support is not available"); |
| } |
| } else { LWComponent.errorMsg("Font not available.."); } |
| } |
| |
| eventOccurred = false; |
| g.setColor(prevColor); |
| unrestrictGraphicsFromClientArea(g); |
| } |
| |
| // Draw String items |
| private void drawItem(Graphics g, int listIndex, int drawCol, |
| int drawRow, int rectRow, FontMetrics fm) { |
| Point loc = getClientLocation(); |
| Dimension dim = getClientSize(); |
| String str = getItem(listIndex); |
| if (multipleMode) { |
| for (int i1 = 0; i1 < selList.size(); i1++) { |
| if (listIndex == ((Integer)selList.elementAt(i1))) { |
| g.setColor(getFocusColor()); |
| g.fillRect(loc.x + getBorderWidth(), |
| rectRow, |
| dim.width - getBorderWidth() * 2, |
| fm.getHeight()); |
| g.setColor(getFocusEnabledColor()); |
| g.drawRect(loc.x + getBorderWidth(), |
| rectRow, |
| dim.width - getBorderWidth() * 2, |
| fm.getHeight()); |
| } |
| } // for |
| } else { |
| if (listIndex == getSelectedIndex() && !multipleMode) { |
| g.setColor(getFocusColor()); |
| g.fillRect(loc.x + getBorderWidth(), |
| rectRow, |
| dim.width - getBorderWidth() * 2, |
| fm.getHeight()); |
| g.setColor(getFocusForeColor()); |
| } |
| if ((listIndex == prevfocusIndex) && (prevfocusIndex != getSelectedIndex()) && !multipleMode) { |
| g.setColor(getBackground()); |
| g.fillRect(loc.x + getBorderWidth(), |
| rectRow, |
| dim.width - getBorderWidth() * 2, |
| fm.getHeight()); |
| prevfocusIndex = getSelectedIndex(); |
| } |
| if (focusEnabled && listIndex == getSelectedIndex() && !multipleMode) { |
| g.setColor(getFocusEnabledColor()); |
| g.drawRect(loc.x + getBorderWidth(), |
| rectRow, |
| dim.width - getBorderWidth() * 2, |
| fm.getHeight()); |
| } |
| } |
| g.setColor(getForeground()); |
| g.drawString(str,drawCol,drawRow); |
| } |
| |
| } |
| |