コード例 #1
0
  /*
   * (non-Javadoc)
   *
   * @see org.eclipse.jface.bindings.keys.AbstractKeyFormatter#sortModifierKeys(int)
   */
  protected int[] sortModifierKeys(final int modifierKeys) {
    final IKeyLookup lookup = KeyLookupFactory.getDefault();
    final int[] sortedKeys = new int[4];
    int index = 0;

    if (Util.isWindows()) {
      if ((modifierKeys & lookup.getCtrl()) != 0) {
        sortedKeys[index++] = lookup.getCtrl();
      }
      if ((modifierKeys & lookup.getAlt()) != 0) {
        sortedKeys[index++] = lookup.getAlt();
      }
      if ((modifierKeys & lookup.getShift()) != 0) {
        sortedKeys[index++] = lookup.getShift();
      }

    } else if (Util.isGtk() || Util.isMotif()) {
      if ((modifierKeys & lookup.getShift()) != 0) {
        sortedKeys[index++] = lookup.getShift();
      }
      if ((modifierKeys & lookup.getCtrl()) != 0) {
        sortedKeys[index++] = lookup.getCtrl();
      }
      if ((modifierKeys & lookup.getAlt()) != 0) {
        sortedKeys[index++] = lookup.getAlt();
      }

    } else if (Util.isMac()) {
      if ((modifierKeys & lookup.getShift()) != 0) {
        sortedKeys[index++] = lookup.getShift();
      }
      if ((modifierKeys & lookup.getCtrl()) != 0) {
        sortedKeys[index++] = lookup.getCtrl();
      }
      if ((modifierKeys & lookup.getAlt()) != 0) {
        sortedKeys[index++] = lookup.getAlt();
      }
      if ((modifierKeys & lookup.getCommand()) != 0) {
        sortedKeys[index++] = lookup.getCommand();
      }
    }

    return sortedKeys;
  }
コード例 #2
0
/*
 * The lightweight popup used to show content proposals for a text field. If
 * additional information exists for a proposal, then selecting that
 * proposal will result in the information being displayed in a secondary
 * popup.
 */
public class ContentProposalPopup extends PopupDialog {

  /*
   * Set to <code>true</code> to use a Table with SWT.VIRTUAL. This is a
   * workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=98585#c40
   * The corresponding SWT bug is
   * https://bugs.eclipse.org/bugs/show_bug.cgi?id=90321
   */
  private static final boolean USE_VIRTUAL = !Util.isMotif();

  /*
   * Empty string.
   */
  private static final String EMPTY = ""; // $NON-NLS-1$

  /*
   * The delay before showing a secondary popup.
   */
  private static final int POPUP_DELAY = 750;

  /*
   * The character height hint for the popup. May be overridden by using
   * setInitialPopupSize.
   */
  private static final int POPUP_CHAR_HEIGHT = 10;

  /*
   * The minimum pixel width for the popup. May be overridden by using
   * setInitialPopupSize.
   */
  private static final int POPUP_MINIMUM_WIDTH = 300;

  /*
   * The pixel offset of the popup from the bottom corner of the control.
   */
  private static final int POPUP_OFFSET = 3;

  /*
   * The listener we install on the popup and related controls to determine
   * when to close the popup. Some events (move, resize, close, deactivate)
   * trigger closure as soon as they are received, simply because one of the
   * registered listeners received them. Other events depend on additional
   * circumstances.
   */
  private final class PopupCloserListener implements Listener {
    private boolean scrollbarClicked = false;

    public void handleEvent(final Event e) {

      // If focus is leaving an important widget or the field's
      // shell is deactivating
      if (e.type == SWT.FocusOut) {
        scrollbarClicked = false;
        /*
         * Ignore this event if it's only happening because focus is
         * moving between the popup shells, their controls, or a
         * scrollbar. Do this in an async since the focus is not
         * actually switched when this event is received.
         */
        e.display.asyncExec(
            new Runnable() {
              public void run() {
                if (isValid()) {
                  if (scrollbarClicked || hasFocus()) {
                    return;
                  }
                  // Workaround a problem on X and Mac, whereby at
                  // this point, the focus control is not known.
                  // This can happen, for example, when resizing
                  // the popup shell on the Mac.
                  // Check the active shell.
                  Shell activeShell = e.display.getActiveShell();
                  if (activeShell == getShell()
                      || (infoPopup != null && infoPopup.getShell() == activeShell)) {
                    return;
                  }
                  /*
                   * System.out.println(e);
                   * System.out.println(e.display.getFocusControl());
                   * System.out.println(e.display.getActiveShell());
                   */
                  close();
                }
              }
            });
        return;
      }

      // Scroll bar has been clicked. Remember this for focus event
      // processing.
      if (e.type == SWT.Selection) {
        scrollbarClicked = true;
        return;
      }
      // For all other events, merely getting them dictates closure.
      close();
    }

    // Install the listeners for events that need to be monitored for
    // popup closure.
    void installListeners() {
      // Listeners on this popup's table and scroll bar
      proposalTable.addListener(SWT.FocusOut, this);
      ScrollBar scrollbar = proposalTable.getVerticalBar();
      if (scrollbar != null) {
        scrollbar.addListener(SWT.Selection, this);
      }

      // Listeners on this popup's shell
      getShell().addListener(SWT.Deactivate, this);
      getShell().addListener(SWT.Close, this);

      // Listeners on the target control
      control.addListener(SWT.MouseDoubleClick, this);
      control.addListener(SWT.MouseDown, this);
      control.addListener(SWT.Dispose, this);
      control.addListener(SWT.FocusOut, this);
      // Listeners on the target control's shell
      Shell controlShell = control.getShell();
      controlShell.addListener(SWT.Move, this);
      controlShell.addListener(SWT.Resize, this);
    }

    // Remove installed listeners
    void removeListeners() {
      if (isValid()) {
        proposalTable.removeListener(SWT.FocusOut, this);
        ScrollBar scrollbar = proposalTable.getVerticalBar();
        if (scrollbar != null) {
          scrollbar.removeListener(SWT.Selection, this);
        }

        getShell().removeListener(SWT.Deactivate, this);
        getShell().removeListener(SWT.Close, this);
      }

      if (control != null && !control.isDisposed()) {

        control.removeListener(SWT.MouseDoubleClick, this);
        control.removeListener(SWT.MouseDown, this);
        control.removeListener(SWT.Dispose, this);
        control.removeListener(SWT.FocusOut, this);

        Shell controlShell = control.getShell();
        controlShell.removeListener(SWT.Move, this);
        controlShell.removeListener(SWT.Resize, this);
      }
    }
  }

  /*
   * The listener we will install on the target control.
   */
  private final class TargetControlListener implements Listener {
    // Key events from the control
    public void handleEvent(Event e) {
      if (!isValid()) {
        return;
      }

      char key = e.character;

      // Traverse events are handled depending on whether the
      // event has a character.
      if (e.type == SWT.Traverse) {
        // If the traverse event contains a legitimate character,
        // then we must set doit false so that the widget will
        // receive the key event. We return immediately so that
        // the character is handled only in the key event.
        // See https://bugs.eclipse.org/bugs/show_bug.cgi?id=132101
        if (key != 0) {
          e.doit = false;
          return;
        }
        // Traversal does not contain a character. Set doit true
        // to indicate TRAVERSE_NONE will occur and that no key
        // event will be triggered. We will check for navigation
        // keys below.
        e.detail = SWT.TRAVERSE_NONE;
        e.doit = true;
      } else {
        // Default is to only propagate when configured that way.
        // Some keys will always set doit to false anyway.
        e.doit = adapter.getPropagateKeys();
      }

      // No character. Check for navigation keys.

      if (key == 0) {
        int newSelection = proposalTable.getSelectionIndex();
        int visibleRows = (proposalTable.getSize().y / proposalTable.getItemHeight()) - 1;
        switch (e.keyCode) {
          case SWT.ARROW_UP:
            newSelection -= 1;
            if (newSelection < 0) {
              newSelection = proposalTable.getItemCount() - 1;
            }
            // Not typical - usually we get this as a Traverse and
            // therefore it never propagates. Added for consistency.
            if (e.type == SWT.KeyDown) {
              // don't propagate to control
              e.doit = false;
            }
            break;

          case SWT.ARROW_DOWN:
            newSelection += 1;
            if (newSelection > proposalTable.getItemCount() - 1) {
              newSelection = 0;
            }
            // Not typical - usually we get this as a Traverse and
            // therefore it never propagates. Added for consistency.
            if (e.type == SWT.KeyDown) {
              // don't propagate to control
              e.doit = false;
            }
            break;

          case SWT.PAGE_DOWN:
            newSelection += visibleRows;
            if (newSelection >= proposalTable.getItemCount()) {
              newSelection = proposalTable.getItemCount() - 1;
            }
            if (e.type == SWT.KeyDown) {
              // don't propagate to control
              e.doit = false;
            }
            break;

          case SWT.PAGE_UP:
            newSelection -= visibleRows;
            if (newSelection < 0) {
              newSelection = 0;
            }
            if (e.type == SWT.KeyDown) {
              // don't propagate to control
              e.doit = false;
            }
            break;

          case SWT.HOME:
            newSelection = 0;
            if (e.type == SWT.KeyDown) {
              // don't propagate to control
              e.doit = false;
            }
            break;

          case SWT.END:
            newSelection = proposalTable.getItemCount() - 1;
            if (e.type == SWT.KeyDown) {
              // don't propagate to control
              e.doit = false;
            }
            break;

            // If received as a Traverse, these should propagate
            // to the control as keydown. If received as a keydown,
            // proposals should be recomputed since the cursor
            // position has changed.
          case SWT.ARROW_LEFT:
          case SWT.ARROW_RIGHT:
            if (e.type == SWT.Traverse) {
              e.doit = false;
            } else {
              e.doit = true;
              String contents = adapter.getControlContentAdapter().getControlContents(control);
              // If there are no contents, changes in cursor
              // position have no effect. Note also that we do
              // not affect the filter text on ARROW_LEFT as
              // we would with BS.
              if (contents.length() > 0) {
                asyncRecomputeProposals();
              }
            }
            break;

            // Any unknown keycodes will cause the popup to close.
            // Modifier keys are explicitly checked and ignored because
            // they are not complete yet (no character).
          default:
            if (e.keyCode != SWT.CAPS_LOCK
                && e.keyCode != SWT.NUM_LOCK
                && e.keyCode != SWT.MOD1
                && e.keyCode != SWT.MOD2
                && e.keyCode != SWT.MOD3
                && e.keyCode != SWT.MOD4) {
              close();
            }
            return;
        }

        // If any of these navigation events caused a new selection,
        // then handle that now and return.
        if (newSelection >= 0) {
          selectProposal(newSelection);
        }
        return;
      }

      // key != 0
      // Check for special keys involved in cancelling, accepting, or
      // filtering the proposals.
      switch (key) {
        case SWT.ESC:
          e.doit = false;
          close();
          break;

        case SWT.LF:
        case SWT.CR:
          e.doit = false;
          Object p = getSelectedProposal();
          if (p != null) {
            acceptCurrentProposal();
          } else {
            close();
          }
          break;

        case SWT.TAB:
          e.doit = false;
          getShell().setFocus();
          return;

        case SWT.BS:
          // There is no filtering provided by us, but some
          // clients provide their own filtering based on content.
          // Recompute the proposals if the cursor position
          // will change (is not at 0).
          int pos = adapter.getControlContentAdapter().getCursorPosition(control);
          // We rely on the fact that the contents and pos do not yet
          // reflect the result of the BS. If the contents were
          // already empty, then BS should not cause
          // a recompute.
          if (pos > 0) {
            asyncRecomputeProposals();
          }
          break;

        default:
          // If the key is a defined unicode character, and not one of
          // the special cases processed above, update the filter text
          // and filter the proposals.
          if (Character.isDefined(key)) {
            // Recompute proposals after processing this event.
            asyncRecomputeProposals();
          }
          break;
      }
    }
  }

  /*
   * Internal class used to implement the secondary popup.
   */
  private class InfoPopupDialog extends PopupDialog {

    /*
     * The text control that displays the text.
     */
    private Text text;

    /*
     * The String shown in the popup.
     */
    private String contents = EMPTY;

    /*
     * Construct an info-popup with the specified parent.
     */
    InfoPopupDialog(Shell parent) {
      super(parent, PopupDialog.HOVER_SHELLSTYLE, false, false, false, false, false, null, null);
    }

    /*
     * Create a text control for showing the info about a proposal.
     */
    protected Control createDialogArea(Composite parent) {
      text = new Text(parent, SWT.MULTI | SWT.READ_ONLY | SWT.WRAP | SWT.NO_FOCUS);

      // Use the compact margins employed by PopupDialog.
      GridData gd = new GridData(GridData.BEGINNING | GridData.FILL_BOTH);
      gd.horizontalIndent = PopupDialog.POPUP_HORIZONTALSPACING;
      gd.verticalIndent = PopupDialog.POPUP_VERTICALSPACING;
      text.setLayoutData(gd);
      text.setText(contents);

      // since SWT.NO_FOCUS is only a hint...
      text.addFocusListener(
          new FocusAdapter() {
            public void focusGained(FocusEvent event) {
              ContentProposalPopup.this.close();
            }
          });
      return text;
    }

    /*
     * Adjust the bounds so that we appear adjacent to our parent shell
     */
    protected void adjustBounds() {
      Rectangle parentBounds = getParentShell().getBounds();
      Rectangle proposedBounds;
      // Try placing the info popup to the right
      Rectangle rightProposedBounds =
          new Rectangle(
              parentBounds.x + parentBounds.width + PopupDialog.POPUP_HORIZONTALSPACING,
              parentBounds.y + PopupDialog.POPUP_VERTICALSPACING,
              parentBounds.width,
              parentBounds.height);
      rightProposedBounds = getConstrainedShellBounds(rightProposedBounds);
      // If it won't fit on the right, try the left
      if (rightProposedBounds.intersects(parentBounds)) {
        Rectangle leftProposedBounds =
            new Rectangle(
                parentBounds.x - parentBounds.width - POPUP_HORIZONTALSPACING - 1,
                parentBounds.y,
                parentBounds.width,
                parentBounds.height);
        leftProposedBounds = getConstrainedShellBounds(leftProposedBounds);
        // If it won't fit on the left, choose the proposed bounds
        // that fits the best
        if (leftProposedBounds.intersects(parentBounds)) {
          if (rightProposedBounds.x - parentBounds.x >= parentBounds.x - leftProposedBounds.x) {
            rightProposedBounds.x =
                parentBounds.x + parentBounds.width + PopupDialog.POPUP_HORIZONTALSPACING;
            proposedBounds = rightProposedBounds;
          } else {
            leftProposedBounds.width =
                parentBounds.x - POPUP_HORIZONTALSPACING - leftProposedBounds.x;
            proposedBounds = leftProposedBounds;
          }
        } else {
          // use the proposed bounds on the left
          proposedBounds = leftProposedBounds;
        }
      } else {
        // use the proposed bounds on the right
        proposedBounds = rightProposedBounds;
      }
      getShell().setBounds(proposedBounds);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.eclipse.jface.dialogs.PopupDialog#getForeground()
     */
    protected Color getForeground() {
      return control.getDisplay().getSystemColor(SWT.COLOR_INFO_FOREGROUND);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.eclipse.jface.dialogs.PopupDialog#getBackground()
     */
    protected Color getBackground() {
      return control.getDisplay().getSystemColor(SWT.COLOR_INFO_BACKGROUND);
    }

    /*
     * Set the text contents of the popup.
     */
    void setContents(String newContents) {
      if (newContents == null) {
        newContents = EMPTY;
      }
      this.contents = newContents;
      if (text != null && !text.isDisposed()) {
        text.setText(contents);
      }
    }

    /*
     * Return whether the popup has focus.
     */
    boolean hasFocus() {
      if (text == null || text.isDisposed()) {
        return false;
      }
      return text.getShell().isFocusControl() || text.isFocusControl();
    }
  }

  /*
   * The listener installed on the target control.
   */
  private Listener targetControlListener;

  /*
   * The listener installed in order to close the popup.
   */
  private PopupCloserListener popupCloser;

  /*
   * The table used to show the list of proposals.
   */
  private Table proposalTable;

  /*
   * The text used to display info under the table
   */
  private Text footer;

  /*
   * The proposals to be shown (cached to avoid repeated requests).
   */
  private ContentProposalList proposalList;

  /*
   * Secondary popup used to show detailed information about the selected
   * proposal..
   */
  private InfoPopupDialog infoPopup;

  /*
   * Flag indicating whether there is a pending secondary popup update.
   */
  private boolean pendingDescriptionUpdate = false;

  /*
   * The desired size in pixels of the proposal popup.
   */
  private Point popupSize;

  /*
   * The control for which content proposals are provided.
   */
  private Control control;

  /*
   * A label provider used to display proposals in the popup, and to extract
   * Strings from non-String proposals.
   */
  private ILabelProvider labelProvider;

  private ContentProposalAdapter adapter;

  /**
   * Constructs a new instance of this popup, specifying the control for which this popup is showing
   * content, and how the proposals should be obtained and displayed.
   *
   * @param infoText Text to be shown in a lower info area, or <code>null</code> if there is no info
   *     area.
   */
  ContentProposalPopup(
      ContentProposalAdapter adapter,
      String infoText,
      ContentProposalList proposalList,
      int maxDisplay) {
    // IMPORTANT: Use of SWT.ON_TOP is critical here for ensuring
    // that the target control retains focus on Mac and Linux. Without
    // it, the focus will disappear, keystrokes will not go to the
    // popup, and the popup closer will wrongly close the popup.
    // On platforms where SWT.ON_TOP overrides SWT.RESIZE, we will live with this.
    // See https://bugs.eclipse.org/bugs/show_bug.cgi?id=126138
    super(
        adapter.getControl().getShell(),
        SWT.RESIZE | SWT.ON_TOP,
        false,
        false,
        false,
        false,
        false,
        null,
        infoText);
    this.adapter = adapter;
    this.control = adapter.getControl();
    this.labelProvider = adapter.getLabelProvider();
    this.proposalList = proposalList;
  }

  /*
   * (non-Javadoc)
   *
   * @see org.eclipse.jface.dialogs.PopupDialog#getForeground()
   */
  protected Color getForeground() {
    return JFaceResources.getColorRegistry().get(JFacePreferences.CONTENT_ASSIST_FOREGROUND_COLOR);
  }

  /*
   * (non-Javadoc)
   *
   * @see org.eclipse.jface.dialogs.PopupDialog#getBackground()
   */
  protected Color getBackground() {
    return JFaceResources.getColorRegistry().get(JFacePreferences.CONTENT_ASSIST_BACKGROUND_COLOR);
  }

  /*
   * Creates the content area for the proposal popup. This creates a table and
   * places it inside the composite. The table will contain a list of all the
   * proposals.
   *
   * @param parent The parent composite to contain the dialog area; must not
   * be <code>null</code>.
   */
  protected final Control createDialogArea(final Composite parent) {
    Composite wrapper = (Composite) super.createDialogArea(parent);
    wrapper.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    wrapper.setLayout(new GridLayout());

    // Use virtual where appropriate (see flag definition).
    if (USE_VIRTUAL) {
      proposalTable = new Table(wrapper, SWT.H_SCROLL | SWT.V_SCROLL | SWT.VIRTUAL);
      Listener listener =
          new Listener() {
            public void handleEvent(Event event) {
              handleSetData(event);
            }
          };
      proposalTable.addListener(SWT.SetData, listener);
    } else {
      proposalTable = new Table(parent, SWT.H_SCROLL | SWT.V_SCROLL);
    }

    footer = new Text(wrapper, SWT.READ_ONLY | SWT.WRAP);
    GridData textGridData = new GridData(GridData.HORIZONTAL_ALIGN_END);
    textGridData.widthHint = 100;
    footer.setLayoutData(textGridData);

    // set the proposals to force population of the table.
    setProposals(proposalList);

    proposalTable.setHeaderVisible(false);
    proposalTable.addSelectionListener(
        new SelectionListener() {
          public void widgetSelected(SelectionEvent e) {
            // If a proposal has been selected, show it in the secondary
            // popup. Otherwise close the popup.
            if (e.item == null) {
              if (infoPopup != null) {
                infoPopup.close();
              }
            } else {
              showProposalDescription();
            }
          }

          // Default selection was made. Accept the current proposal.
          public void widgetDefaultSelected(SelectionEvent e) {
            acceptCurrentProposal();
          }
        });
    return proposalTable;
  }

  /*
   * (non-Javadoc)
   *
   * @see org.eclipse.jface.dialogs.PopupDialog.adjustBounds()
   */
  protected void adjustBounds() {
    // Get our control's location in display coordinates.
    Point location = control.getDisplay().map(control.getParent(), null, control.getLocation());
    int initialX = location.x + POPUP_OFFSET;
    int initialY = location.y + control.getSize().y + POPUP_OFFSET;
    // If we are inserting content, use the cursor position to
    // position the control.
    if (adapter.getProposalAcceptanceStyle() == ContentProposalAdapter.PROPOSAL_INSERT) {
      Rectangle insertionBounds = adapter.getControlContentAdapter().getInsertionBounds(control);
      initialX = initialX + insertionBounds.x;
      initialY = location.y + insertionBounds.y + insertionBounds.height;
    }

    // If there is no specified size, force it by setting
    // up a layout on the table.
    if (popupSize == null) {
      GridData data = new GridData(GridData.FILL_BOTH);
      data.heightHint = proposalTable.getItemHeight() * POPUP_CHAR_HEIGHT;
      data.widthHint = Math.max(control.getSize().x, POPUP_MINIMUM_WIDTH);
      proposalTable.setLayoutData(data);
      getShell().pack();
      popupSize = getShell().getSize();
    }

    // Constrain to the display
    Rectangle constrainedBounds =
        getConstrainedShellBounds(new Rectangle(initialX, initialY, popupSize.x, popupSize.y));

    // If there has been an adjustment causing the popup to overlap
    // with the control, then put the popup above the control.
    if (constrainedBounds.y < initialY)
      getShell().setBounds(initialX, location.y - popupSize.y, popupSize.x, popupSize.y);
    else getShell().setBounds(initialX, initialY, popupSize.x, popupSize.y);

    // Now set up a listener to monitor any changes in size.
    getShell()
        .addListener(
            SWT.Resize,
            new Listener() {
              public void handleEvent(Event e) {
                popupSize = getShell().getSize();
                if (infoPopup != null) {
                  infoPopup.adjustBounds();
                }
              }
            });
  }

  /*
   * Handle the set data event. Set the item data of the requested item to the
   * corresponding proposal in the proposal cache.
   */
  private void handleSetData(Event event) {
    TableItem item = (TableItem) event.item;
    int index = proposalTable.indexOf(item);

    int proposalIndex = 0;
    for (String provider : proposalList.getProviderList()) {
      if (index == proposalIndex) {
        int count = proposalList.getCount(provider);
        String text = provider + " (" + count + " matching items)";
        item.setText(text);
        // Data == null => not selectable
        item.setData(null);

        Display display = Display.getCurrent();
        Color color = display.getSystemColor(SWT.COLOR_GRAY);
        FontData fontData = item.getFont().getFontData()[0];
        Font font =
            new Font(
                display,
                new FontData(fontData.getName(), fontData.getHeight(), SWT.ITALIC | SWT.BOLD));
        item.setBackground(color);
        item.setFont(font);

        return;
      }
      proposalIndex++;
      for (IContentProposal proposal : proposalList.getProposals(provider)) {
        if (index == proposalIndex) {
          item.setText("  " + getString(proposal));
          item.setImage(getImage(proposal));
          item.setData(proposal);
          return;
        }
        proposalIndex++;
      }
    }
  }

  /*
   * Caches the specified proposals and repopulates the table if it has been
   * created.
   */
  private void setProposals(ContentProposalList newProposalList) {
    if (newProposalList == null || newProposalList.length() == 0) {
      newProposalList = getEmptyProposalArray();
    }
    this.proposalList = newProposalList;
    if (!isValid()) return;

    // If there is a table
    if (isValid()) {
      if (USE_VIRTUAL) {
        // Set and clear the virtual table. Data will be
        // provided in the SWT.SetData event handler.
        proposalTable.setItemCount(getTableLength());
        proposalTable.clearAll();
      } else {
        // Populate the table manually
        proposalTable.setRedraw(false);

        int itemCount = newProposalList.length() + newProposalList.getProviderList().size();
        proposalTable.setItemCount(itemCount);
        TableItem[] items = proposalTable.getItems();

        int index = 0;
        for (String provider : newProposalList.getProviderList()) {
          TableItem item = items[index];
          int count = newProposalList.getCount(provider);
          String text = provider + " (" + count + " matching items)";
          item.setText(text);
          // Data == null => not selectable
          item.setData(null);

          Display display = Display.getCurrent();
          Color color = display.getSystemColor(SWT.COLOR_GRAY);
          FontData fontData = item.getFont().getFontData()[0];
          Font font =
              new Font(
                  display,
                  new FontData(fontData.getName(), fontData.getHeight(), SWT.ITALIC | SWT.BOLD));
          item.setBackground(color);
          item.setFont(font);

          index++;
          for (IContentProposal proposal : newProposalList.getProposals(provider)) {
            item.setText("  " + getString(proposal));
            item.setImage(getImage(proposal));
            item.setData(proposal);
            index++;
          }
        }

        proposalTable.setRedraw(true);
      }
      // Default to the first selection if there is content.
      if (newProposalList.length() > 0) {
        int index = 0;
        boolean selected = false;
        for (String provider : newProposalList.getProviderList()) {
          index++;
          if (!selected && newProposalList.getCount(provider) > 0) {
            selectProposal(index);
            selected = true;
          }
        }
      } else {
        // No selection, close the secondary popup if it was open
        if (infoPopup != null) {
          infoPopup.close();
        }
      }
    }
    footer.setText("");
  }

  private int getTableLength() {
    if (proposalList == null) return 0;
    return proposalList.length() + proposalList.getProviderList().size();
  }

  /*
   * Get the string for the specified proposal. Always return a String of some
   * kind.
   */
  private String getString(IContentProposal proposal) {
    if (proposal == null) {
      return EMPTY;
    }
    if (labelProvider == null) {
      return proposal.getLabel() == null ? proposal.getContent() : proposal.getLabel();
    }
    return labelProvider.getText(proposal);
  }

  /*
   * Get the image for the specified proposal. If there is no image available,
   * return null.
   */
  private Image getImage(IContentProposal proposal) {
    if (proposal == null || labelProvider == null) {
      return null;
    }
    return labelProvider.getImage(proposal);
  }

  /*
   * Return an empty array. Used so that something always shows in the
   * proposal popup, even if no proposal provider was specified.
   */
  private ContentProposalList getEmptyProposalArray() {
    return new ContentProposalList();
  }

  /*
   * Answer true if the popup is valid, which means the table has been created
   * and not disposed.
   */
  private boolean isValid() {
    return proposalTable != null && !proposalTable.isDisposed();
  }

  /*
   * Return whether the receiver has focus. Since 3.4, this includes a check
   * for whether the info popup has focus.
   */
  public boolean hasFocus() {
    if (!isValid()) {
      return false;
    }
    if (getShell().isFocusControl() || proposalTable.isFocusControl()) {
      return true;
    }
    if (infoPopup != null && infoPopup.hasFocus()) {
      return true;
    }
    return false;
  }

  /*
   * Return the current selected proposal.
   */
  private IContentProposal getSelectedProposal() {
    if (isValid()) {
      int index = proposalTable.getSelectionIndex();
      if (proposalList == null || index < 0 || index >= getTableLength()) {
        return null;
      }
      int proposalIndex = 0;
      for (String provider : proposalList.getProviderList()) {
        if (index == proposalIndex) {
          return null;
        }
        proposalIndex++;
        for (IContentProposal proposal : proposalList.getProposals(provider)) {
          if (index == proposalIndex) {
            return proposal;
          }
          proposalIndex++;
        }
      }
    }
    return null;
  }

  /*
   * Select the proposal at the given index.
   */
  private void selectProposal(int index) {
    Assert.isTrue(index >= 0, "Proposal index should never be negative"); // $NON-NLS-1$
    if (!isValid() || proposalList == null || index >= getTableLength()) {
      return;
    }
    proposalTable.setSelection(index);
    proposalTable.showSelection();

    showProposalDescription();
  }

  /**
   * Opens this ContentProposalPopup. This method is extended in order to add the control listener
   * when the popup is opened and to invoke the secondary popup if applicable.
   *
   * @return the return code
   * @see org.eclipse.jface.window.Window#open()
   */
  public int open() {
    int value = super.open();
    if (popupCloser == null) {
      popupCloser = new PopupCloserListener();
    }
    popupCloser.installListeners();
    IContentProposal p = getSelectedProposal();
    if (p != null) {
      showProposalDescription();
    }
    return value;
  }

  /**
   * Closes this popup. This method is extended to remove the control listener.
   *
   * @return <code>true</code> if the window is (or was already) closed, and <code>false</code> if
   *     it is still open
   */
  public boolean close() {
    popupCloser.removeListeners();
    if (infoPopup != null) {
      infoPopup.close();
    }
    boolean ret = super.close();
    adapter.notifyPopupClosed();
    return ret;
  }

  /*
   * Show the currently selected proposal's description in a secondary popup.
   */
  private void showProposalDescription() {
    // If we do not already have a pending update, then
    // create a thread now that will show the proposal description
    if (!pendingDescriptionUpdate) {
      // Create a thread that will sleep for the specified delay
      // before creating the popup. We do not use Jobs since this
      // code must be able to run independently of the Eclipse
      // runtime.
      Runnable runnable =
          new Runnable() {
            public void run() {
              pendingDescriptionUpdate = true;
              try {
                Thread.sleep(POPUP_DELAY);
              } catch (InterruptedException e) {
              }
              if (!isValid()) {
                return;
              }
              getShell()
                  .getDisplay()
                  .syncExec(
                      new Runnable() {
                        public void run() {
                          // Query the current selection since we have
                          // been delayed
                          IContentProposal p = getSelectedProposal();
                          if (p != null) {
                            String description = p.getDescription();
                            if (description != null) {
                              if (infoPopup == null) {
                                infoPopup = new InfoPopupDialog(getShell());
                                infoPopup.open();
                                infoPopup
                                    .getShell()
                                    .addDisposeListener(
                                        new DisposeListener() {
                                          public void widgetDisposed(DisposeEvent event) {
                                            infoPopup = null;
                                          }
                                        });
                              }
                              infoPopup.setContents(p.getDescription());
                            } else if (infoPopup != null) {
                              infoPopup.close();
                            }
                            pendingDescriptionUpdate = false;
                          }
                        }
                      });
            }
          };
      Thread t = new Thread(runnable);
      t.start();
    }
  }

  /*
   * Accept the current proposal.
   */
  private void acceptCurrentProposal() {
    // Close before accepting the proposal. This is important
    // so that the cursor position can be properly restored at
    // acceptance, which does not work without focus on some controls.
    // See https://bugs.eclipse.org/bugs/show_bug.cgi?id=127108
    IContentProposal proposal = getSelectedProposal();
    close();
    if (proposal != null) {
      adapter.proposalAccepted(proposal);
    }
  }

  /*
   * Request the proposals from the proposal provider, and recompute any
   * caches. Repopulate the popup if it is open.
   */
  private void recomputeProposals(ContentProposalList newProposalList) {
    if (newProposalList == null) newProposalList = getEmptyProposalArray();
    // If the non-filtered proposal list is empty, we should close the popup.
    // See https://bugs.eclipse.org/bugs/show_bug.cgi?id=147377
    if (newProposalList.length() == 0) {
      this.proposalList = newProposalList;
      close();
    } else {
      // Keep the popup open, but filter by any provided filter text
      setProposals(newProposalList);
    }
  }

  /*
   * In an async block, request the proposals. This is used when clients are
   * in the middle of processing an event that affects the widget content. By
   * using an async, we ensure that the widget content is up to date with the
   * event.
   */
  private void asyncRecomputeProposals() {
    footer.setText("Searching...");
    if (isValid()) {
      control
          .getDisplay()
          .asyncExec(
              new Runnable() {
                public void run() {
                  adapter.recordCursorPosition();
                  adapter.getProposals(
                      new IContentProposalSearchHandler() {
                        @Override
                        public void handleResult(ContentProposalList proposalList) {
                          recomputeProposals(proposalList);
                        }
                      });
                }
              });
    } else {
      adapter.getProposals(
          new IContentProposalSearchHandler() {
            @Override
            public void handleResult(ContentProposalList proposalList) {
              recomputeProposals(proposalList);
            }
          });
    }
  }

  Listener getTargetControlListener() {
    if (targetControlListener == null) {
      targetControlListener = new TargetControlListener();
    }
    return targetControlListener;
  }

  public Point getPopupSize() {
    return popupSize;
  }

  public void setPopupSize(Point size) {
    popupSize = size;
  }
}