/*******************************************************************************
* Copyright (c) 2014, 2015 vogella GmbH and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Simon Scholz <simon.scholz@vogella.com> - initial API and implementation based on org.eclipse.ui.dialogs.FilteredTree
*******************************************************************************/
package org.eclipse.e4.ui.dialogs.filteredtree;
import java.net.URL;
import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.e4.ui.dialogs.textbundles.E4DialogMessages;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.resource.LocalResourceManager;
import org.eclipse.jface.resource.ResourceManager;
import org.eclipse.jface.viewers.IContentProvider;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.osgi.util.NLS;
import org.eclipse.swt.SWT;
import org.eclipse.swt.accessibility.ACC;
import org.eclipse.swt.accessibility.AccessibleAdapter;
import org.eclipse.swt.accessibility.AccessibleControlAdapter;
import org.eclipse.swt.accessibility.AccessibleControlEvent;
import org.eclipse.swt.accessibility.AccessibleEvent;
import org.eclipse.swt.events.FocusAdapter;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.KeyAdapter;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseMoveListener;
import org.eclipse.swt.events.MouseTrackListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.layout.RowData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
import org.osgi.framework.Bundle;
import org.osgi.framework.FrameworkUtil;
/**
* Based on org.eclipse.ui.dialogs.FilteredTree.
*/
public class FilteredTree extends Composite {
/**
* The filter text widget to be used by this tree. This value may be
* <code>null</code> if there is no filter widget, or if the controls have
* not yet been created.
*/
private Text filterText;
/**
* The control representing the clear button for the filter text entry. This
* value may be <code>null</code> if no such button exists, or if the
* controls have not yet been created.
*/
private Control clearButtonControl;
/**
* The viewer for the filtered tree. This value should never be
* <code>null</code> after the widget creation methods are complete.
*/
private TreeViewer treeViewer;
/**
* The Composite on which the filter controls are created. This is used to
* set the background color of the filter controls to match the surrounding
* controls.
*/
private Composite filterComposite;
/**
* The pattern filter for the tree. This value must not be <code>null</code>
* .
*/
private PatternFilter patternFilter;
/**
* The text to initially show in the filter text control.
*/
private String initialText = ""; //$NON-NLS-1$
/**
* The job used to refresh the tree.
*/
private Job refreshJob;
/**
* Whether or not to show the filter controls (text and clear button). The
* default is to show these controls.
*/
private boolean showFilterControls;
private Composite treeComposite;
/**
* Image descriptor for enabled clear button.
*/
private static final String CLEAR_ICON = "org.eclipse.ui.internal.dialogs.CLEAR_ICON"; //$NON-NLS-1$
/**
* Image descriptor for disabled clear button.
*/
private static final String DISABLED_CLEAR_ICON = "org.eclipse.ui.internal.dialogs.DCLEAR_ICON"; //$NON-NLS-1$
/**
* Image descriptor for disabled clear button.
*/
private static final String PRESSED_CLEAR_ICON = "org.eclipse.ui.internal.dialogs.PRESSED_CLEAR_ICON"; //$NON-NLS-1$
/**
* Maximum time spent expanding the tree after the filter text has been
* updated (this is only used if we were able to at least expand the visible
* nodes)
*/
private static final long SOFT_MAX_EXPAND_TIME = 200;
/**
* Get image descriptors for the clear button.
*/
static {
Bundle bundle = FrameworkUtil.getBundle(FilteredTree.class);
IPath enabledPath = new Path("$nl$/icons/full/etool16/clear_co.png");
URL enabledURL = FileLocator.find(bundle, enabledPath, null);
ImageDescriptor enabledDesc = ImageDescriptor.createFromURL(enabledURL);
if (enabledDesc != null) {
JFaceResources.getImageRegistry().put(CLEAR_ICON, enabledDesc);
JFaceResources.getImageRegistry().put(PRESSED_CLEAR_ICON,
ImageDescriptor.createWithFlags(enabledDesc, SWT.IMAGE_GRAY));
}
IPath disabledPath = new Path("$nl$/icons/full/dtool16/clear_co.png");
URL disabledURL = FileLocator.find(bundle, disabledPath, null);
ImageDescriptor disabledDesc = ImageDescriptor.createFromURL(disabledURL);
if (disabledDesc != null) {
JFaceResources.getImageRegistry().put(DISABLED_CLEAR_ICON, disabledDesc);
}
}
/**
* Create a new instance of the receiver.
*
* @param parent
* the parent <code>Composite</code>
* @param treeStyle
* the style bits for the <code>Tree</code>
* @param filter
* the filter to be used
*/
public FilteredTree(Composite parent, int treeStyle, PatternFilter filter) {
super(parent, SWT.NONE);
init(treeStyle, filter);
}
/**
* Create a new instance of the receiver. Subclasses that wish to override
* the default creation behavior may use this constructor, but must ensure
* that the <code>init(composite, int, PatternFilter)</code> method is
* called in the overriding constructor.
*
* @param parent
* the parent <code>Composite</code>
* @see #init(int, PatternFilter)
*
*/
protected FilteredTree(Composite parent) {
super(parent, SWT.NONE);
}
/**
* Create the filtered tree.
*
* @param treeStyle
* the style bits for the <code>Tree</code>
* @param filter
* the filter to be used
*
* @since 3.3
*/
protected void init(int treeStyle, PatternFilter filter) {
patternFilter = filter;
setShowFilterControls(true);
createControl(getParent(), treeStyle);
createRefreshJob();
setInitialText(E4DialogMessages.FilteredTree_FilterMessage);
setFont(getParent().getFont());
}
/**
* Create the filtered tree's controls. Subclasses should override.
*
* @param parent
* @param treeStyle
*/
protected void createControl(Composite parent, int treeStyle) {
GridLayout layout = new GridLayout();
layout.marginHeight = 0;
layout.marginWidth = 0;
setLayout(layout);
setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
if (useNativeSearchField(parent)) {
filterComposite = new Composite(this, SWT.NONE);
} else {
filterComposite = new Composite(this, SWT.BORDER);
filterComposite.setBackground(getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
}
GridLayout filterLayout = new GridLayout(2, false);
filterLayout.marginHeight = 0;
filterLayout.marginWidth = 0;
filterComposite.setLayout(filterLayout);
filterComposite.setFont(parent.getFont());
createFilterControls(filterComposite);
GridData gridData = new GridData(SWT.FILL, SWT.BEGINNING, true, false);
filterComposite.setVisible(isShowFilterControls());
gridData.exclude = !isShowFilterControls();
filterComposite.setLayoutData(gridData);
treeComposite = new Composite(this, SWT.NONE);
GridLayout treeCompositeLayout = new GridLayout();
treeCompositeLayout.marginHeight = 0;
treeCompositeLayout.marginWidth = 0;
treeComposite.setLayout(treeCompositeLayout);
GridData data = new GridData(SWT.FILL, SWT.FILL, true, true);
treeComposite.setLayoutData(data);
createTreeControl(treeComposite, treeStyle);
}
private static Boolean useNativeSearchField;
private static boolean useNativeSearchField(Composite composite) {
if (useNativeSearchField == null) {
useNativeSearchField = Boolean.FALSE;
Text testText = null;
try {
testText = new Text(composite, SWT.SEARCH | SWT.ICON_CANCEL);
useNativeSearchField = Boolean.valueOf((testText.getStyle() & SWT.ICON_CANCEL) != 0);
} finally {
if (testText != null) {
testText.dispose();
}
}
}
return useNativeSearchField.booleanValue();
}
/**
* Create the filter controls. By default, a text and corresponding tool bar
* button that clears the contents of the text is created. Subclasses may
* override.
*
* @param parent
* parent <code>Composite</code> of the filter controls
* @return the <code>Composite</code> that contains the filter controls
*/
protected Composite createFilterControls(Composite parent) {
createFilterText(parent);
createClearText(parent);
if (clearButtonControl != null) {
// initially there is no text to clear
clearButtonControl.setVisible(false);
}
return parent;
}
/**
* Creates and set up the tree and tree viewer. This method calls
* {@link #doCreateTreeViewer(Composite, int)} to create the tree viewer.
* Subclasses should override {@link #doCreateTreeViewer(Composite, int)}
* instead of overriding this method.
*
* @param parent
* parent <code>Composite</code>
* @param style
* SWT style bits used to create the tree
* @return the tree
*/
protected Control createTreeControl(Composite parent, int style) {
treeViewer = doCreateTreeViewer(parent, style);
GridData data = new GridData(SWT.FILL, SWT.FILL, true, true);
treeViewer.getControl().setLayoutData(data);
treeViewer.getControl().addDisposeListener(e -> refreshJob.cancel());
if (treeViewer instanceof NotifyingTreeViewer) {
patternFilter.setUseCache(true);
}
treeViewer.addFilter(patternFilter);
return treeViewer.getControl();
}
/**
* Creates the tree viewer. Subclasses may override.
*
* @param parent
* the parent composite
* @param style
* SWT style bits used to create the tree viewer
* @return the tree viewer
*
* @since 3.3
*/
protected TreeViewer doCreateTreeViewer(Composite parent, int style) {
return new NotifyingTreeViewer(parent, style);
}
/**
* Return the first item in the tree that matches the filter pattern.
*
* @param items
* @return the first matching TreeItem
*/
private TreeItem getFirstMatchingItem(TreeItem[] items) {
for (TreeItem item : items) {
if (patternFilter.isLeafMatch(treeViewer, item.getData())
&& patternFilter.isElementSelectable(item.getData())) {
return item;
}
TreeItem treeItem = getFirstMatchingItem(item.getItems());
if (treeItem != null) {
return treeItem;
}
}
return null;
}
/**
* Create the refresh job for the receiver.
*
*/
private void createRefreshJob() {
refreshJob = doCreateRefreshJob();
refreshJob.setSystem(true);
}
/**
* Creates a workbench job that will refresh the tree based on the current
* filter text. Subclasses may override.
*
* @return a workbench job that can be scheduled to refresh the tree
*
* @since 3.4
*/
protected BasicUIJob doCreateRefreshJob() {
return new BasicUIJob("Refresh Filter", getDisplay()) {//$NON-NLS-1$
@Override
public IStatus runInUIThread(IProgressMonitor monitor) {
if (treeViewer.getControl().isDisposed()) {
return Status.CANCEL_STATUS;
}
String text = getFilterString();
if (text == null) {
return Status.OK_STATUS;
}
boolean initial = initialText != null && initialText.equals(text);
if (initial) {
patternFilter.setPattern(null);
} else if (text != null) {
patternFilter.setPattern(text);
}
Control redrawFalseControl = treeComposite != null ? treeComposite : treeViewer.getControl();
try {
// don't want the user to see updates that will be made to
// the tree
// we are setting redraw(false) on the composite to avoid
// dancing scrollbar
redrawFalseControl.setRedraw(false);
if (!narrowingDown) {
// collapse all
TreeItem[] is = treeViewer.getTree().getItems();
for (TreeItem item : is) {
if (item.getExpanded()) {
treeViewer.setExpandedState(item.getData(), false);
}
}
}
treeViewer.refresh(true);
if (text.length() > 0 && !initial) {
/*
* Expand elements one at a time. After each is
* expanded, check to see if the filter text has been
* modified. If it has, then cancel the refresh job so
* the user doesn't have to endure expansion of all the
* nodes.
*/
TreeItem[] items = getViewer().getTree().getItems();
int treeHeight = getViewer().getTree().getBounds().height;
int numVisibleItems = treeHeight / getViewer().getTree().getItemHeight();
long stopTime = SOFT_MAX_EXPAND_TIME + System.currentTimeMillis();
boolean cancel = false;
if (items.length > 0
&& recursiveExpand(items, monitor, stopTime, new int[] { numVisibleItems })) {
cancel = true;
}
// enabled toolbar - there is text to clear
// and the list is currently being filtered
updateToolbar(true);
if (cancel) {
return Status.CANCEL_STATUS;
}
} else {
// disabled toolbar - there is no text to clear
// and the list is currently not filtered
updateToolbar(false);
}
} finally {
// done updating the tree - set redraw back to true
TreeItem[] items = getViewer().getTree().getItems();
if (items.length > 0 && getViewer().getTree().getSelectionCount() == 0) {
treeViewer.getTree().setTopItem(items[0]);
}
redrawFalseControl.setRedraw(true);
}
return Status.OK_STATUS;
}
/**
* Returns true if the job should be canceled (because of timeout or
* actual cancellation).
*
* @param items
* @param monitor
* @param cancelTime
* @param numItemsLeft
* @return true if canceled
*/
private boolean recursiveExpand(TreeItem[] items, IProgressMonitor monitor, long cancelTime,
int[] numItemsLeft) {
boolean canceled = false;
for (int i = 0; !canceled && i < items.length; i++) {
TreeItem item = items[i];
boolean visible = numItemsLeft[0]-- >= 0;
if (monitor.isCanceled() || (!visible && System.currentTimeMillis() > cancelTime)) {
canceled = true;
} else {
Object itemData = item.getData();
if (itemData != null) {
if (!item.getExpanded()) {
// do the expansion through the viewer so that
// it can refresh children appropriately.
treeViewer.setExpandedState(itemData, true);
}
TreeItem[] children = item.getItems();
if (items.length > 0) {
canceled = recursiveExpand(children, monitor, cancelTime, numItemsLeft);
}
}
}
}
return canceled;
}
};
}
protected void updateToolbar(boolean visible) {
if (clearButtonControl != null) {
clearButtonControl.setVisible(visible);
}
}
/**
* Creates the filter text and adds listeners. This method calls
* {@link #doCreateFilterText(Composite)} to create the text control.
* Subclasses should override {@link #doCreateFilterText(Composite)} instead
* of overriding this method.
*
* @param parent
* <code>Composite</code> of the filter text
*/
protected void createFilterText(Composite parent) {
filterText = doCreateFilterText(parent);
filterText.getAccessible().addAccessibleListener(new AccessibleAdapter() {
@Override
public void getName(AccessibleEvent e) {
String filterTextString = filterText.getText();
if (filterTextString.length() == 0 || filterTextString.equals(initialText)) {
e.result = initialText;
} else {
e.result = NLS.bind(E4DialogMessages.FilteredTree_AccessibleListenerFiltered,
new String[] { filterTextString, String.valueOf(getFilteredItemsCount()) });
}
}
/**
* Return the number of filtered items
*
* @return int
*/
private int getFilteredItemsCount() {
int total = 0;
TreeItem[] items = getViewer().getTree().getItems();
for (TreeItem item : items) {
total += itemCount(item);
}
return total;
}
/**
* Return the count of treeItem and it's children to infinite depth.
*
* @param treeItem
* @return int
*/
private int itemCount(TreeItem treeItem) {
int count = 1;
TreeItem[] children = treeItem.getItems();
for (TreeItem element : children) {
count += itemCount(element);
}
return count;
}
});
filterText.addFocusListener(new FocusAdapter() {
@Override
public void focusLost(FocusEvent e) {
if (filterText.getText().equals(initialText)) {
setFilterText(""); //$NON-NLS-1$
textChanged();
}
}
});
filterText.addMouseListener(new MouseAdapter() {
@Override
public void mouseDown(MouseEvent e) {
if (filterText.getText().equals(initialText)) {
// XXX: We cannot call clearText() due to
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=260664
setFilterText(""); //$NON-NLS-1$
textChanged();
}
}
});
filterText.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
// on a CR we want to transfer focus to the list
boolean hasItems = getViewer().getTree().getItemCount() > 0;
if (hasItems && e.keyCode == SWT.ARROW_DOWN) {
treeViewer.getTree().setFocus();
return;
}
}
});
// enter key set focus to tree
filterText.addTraverseListener(e -> {
if (e.detail == SWT.TRAVERSE_RETURN) {
e.doit = false;
if (getViewer().getTree().getItemCount() == 0) {
Display.getCurrent().beep();
} else {
// if the initial filter text hasn't changed, do not try
// to match
boolean hasFocus = getViewer().getTree().setFocus();
boolean textChanged = !getInitialText().equals(filterText.getText().trim());
if (hasFocus && textChanged && filterText.getText().trim().length() > 0) {
Tree tree = getViewer().getTree();
TreeItem item;
if (tree.getSelectionCount() > 0) {
item = getFirstMatchingItem(tree.getSelection());
} else {
item = getFirstMatchingItem(tree.getItems());
}
if (item != null) {
tree.setSelection(new TreeItem[] { item });
ISelection sel = getViewer().getSelection();
getViewer().setSelection(sel, true);
}
}
}
}
});
filterText.addModifyListener(e -> textChanged());
// if we're using a field with built in cancel we need to listen for
// default selection changes (which tell us the cancel button has been
// pressed)
if ((filterText.getStyle() & SWT.ICON_CANCEL) != 0) {
filterText.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetDefaultSelected(SelectionEvent e) {
if (e.detail == SWT.ICON_CANCEL) {
clearText();
}
}
});
}
GridData gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
// if the text widget supported cancel then it will have it's own
// integrated button. We can take all of the space.
if ((filterText.getStyle() & SWT.ICON_CANCEL) != 0) {
gridData.horizontalSpan = 2;
}
filterText.setLayoutData(gridData);
}
/**
* Creates the text control for entering the filter text. Subclasses may
* override.
*
* @param parent
* the parent composite
* @return the text widget
*
* @since 3.3
*/
protected Text doCreateFilterText(Composite parent) {
if (useNativeSearchField(parent)) {
return new Text(parent, SWT.SINGLE | SWT.BORDER | SWT.SEARCH | SWT.ICON_CANCEL);
}
return new Text(parent, SWT.SINGLE);
}
private String previousFilterText;
private boolean narrowingDown;
/**
* Update the receiver after the text has changed.
*/
protected void textChanged() {
narrowingDown = previousFilterText == null
|| previousFilterText.equals(E4DialogMessages.FilteredTree_FilterMessage)
|| getFilterString().startsWith(previousFilterText);
previousFilterText = getFilterString();
// cancel currently running job first, to prevent unnecessary redraw
refreshJob.cancel();
refreshJob.schedule(getRefreshJobDelay());
}
/**
* Return the time delay that should be used when scheduling the filter
* refresh job. Subclasses may override.
*
* @return a time delay in milliseconds before the job should run
*
* @since 3.5
*/
protected long getRefreshJobDelay() {
return 200;
}
/**
* Set the background for the widgets that support the filter text area.
*
* @param background
* background <code>Color</code> to set
*/
@Override
public void setBackground(Color background) {
super.setBackground(background);
if (filterComposite != null && (useNativeSearchField(filterComposite))) {
filterComposite.setBackground(background);
}
}
/**
* Create the button that clears the text.
*
* @param parent
* parent <code>Composite</code> of toolbar button
*/
private void createClearText(Composite parent) {
// only create the button if the text widget doesn't support one
// natively
if ((filterText.getStyle() & SWT.ICON_CANCEL) == 0) {
final Label clearButton = new Label(parent, SWT.NONE);
ResourceManager resourceManager = new LocalResourceManager(JFaceResources.getResources(), clearButton);
final Image inactiveImage = resourceManager
.createImage(JFaceResources.getImageRegistry().getDescriptor(DISABLED_CLEAR_ICON));
final Image activeImage = resourceManager
.createImage(JFaceResources.getImageRegistry().getDescriptor(CLEAR_ICON));
final Image pressedImage = resourceManager
.createImage(JFaceResources.getImageRegistry().getDescriptor(PRESSED_CLEAR_ICON));
clearButton.setLayoutData(new GridData(SWT.BEGINNING, SWT.CENTER, false, false));
clearButton.setImage(inactiveImage);
clearButton.setBackground(parent.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
clearButton.setToolTipText(E4DialogMessages.FilteredTree_ClearToolTip);
clearButton.addMouseListener(new MouseAdapter() {
private MouseMoveListener fMoveListener;
@Override
public void mouseDown(MouseEvent e) {
clearButton.setImage(pressedImage);
fMoveListener = new MouseMoveListener() {
private boolean fMouseInButton = true;
@Override
public void mouseMove(MouseEvent e) {
boolean mouseInButton = isMouseInButton(e);
if (mouseInButton != fMouseInButton) {
fMouseInButton = mouseInButton;
clearButton.setImage(mouseInButton ? pressedImage : inactiveImage);
}
}
};
clearButton.addMouseMoveListener(fMoveListener);
}
@Override
public void mouseUp(MouseEvent e) {
if (fMoveListener != null) {
clearButton.removeMouseMoveListener(fMoveListener);
fMoveListener = null;
boolean mouseInButton = isMouseInButton(e);
clearButton.setImage(mouseInButton ? activeImage : inactiveImage);
if (mouseInButton) {
clearText();
filterText.setFocus();
}
}
}
private boolean isMouseInButton(MouseEvent e) {
Point buttonSize = clearButton.getSize();
return 0 <= e.x && e.x < buttonSize.x && 0 <= e.y && e.y < buttonSize.y;
}
});
clearButton.addMouseTrackListener(new MouseTrackListener() {
@Override
public void mouseEnter(MouseEvent e) {
clearButton.setImage(activeImage);
}
@Override
public void mouseExit(MouseEvent e) {
clearButton.setImage(inactiveImage);
}
@Override
public void mouseHover(MouseEvent e) {
}
});
clearButton.getAccessible().addAccessibleListener(new AccessibleAdapter() {
@Override
public void getName(AccessibleEvent e) {
e.result = E4DialogMessages.FilteredTree_AccessibleListenerClearButton;
}
});
clearButton.getAccessible().addAccessibleControlListener(new AccessibleControlAdapter() {
@Override
public void getRole(AccessibleControlEvent e) {
e.detail = ACC.ROLE_PUSHBUTTON;
}
});
this.clearButtonControl = clearButton;
}
}
/**
* Clears the text in the filter text widget.
*/
protected void clearText() {
setFilterText(""); //$NON-NLS-1$
textChanged();
}
/**
* Set the text in the filter control.
*
* @param string
*/
protected void setFilterText(String string) {
if (filterText != null) {
filterText.setText(string);
selectAll();
}
}
/**
* Returns the pattern filter used by this tree.
*
* @return The pattern filter; never <code>null</code>.
*/
public final PatternFilter getPatternFilter() {
return patternFilter;
}
/**
* Get the tree viewer of the receiver.
*
* @return the tree viewer
*/
public TreeViewer getViewer() {
return treeViewer;
}
/**
* Get the filter text for the receiver, if it was created. Otherwise return
* <code>null</code>.
*
* @return the filter Text, or null if it was not created
*/
public Text getFilterControl() {
return filterText;
}
/**
* Convenience method to return the text of the filter control. If the text
* widget is not created, then null is returned.
*
* @return String in the text, or null if the text does not exist
*/
protected String getFilterString() {
return filterText != null ? filterText.getText() : null;
}
/**
* Set the text that will be shown until the first focus. A default value is
* provided, so this method only need be called if overriding the default
* initial text is desired.
*
* @param text
* initial text to appear in text field
*/
public void setInitialText(String text) {
initialText = text;
if (filterText != null) {
filterText.setMessage(text);
if (filterText.isFocusControl()) {
setFilterText(initialText);
textChanged();
} else {
getDisplay().asyncExec(() -> {
if (!filterText.isDisposed() && filterText.isFocusControl()) {
setFilterText(initialText);
textChanged();
}
});
}
} else {
setFilterText(initialText);
textChanged();
}
}
/**
* Select all text in the filter text field.
*
*/
protected void selectAll() {
if (filterText != null) {
filterText.selectAll();
}
}
/**
* Get the initial text for the receiver.
*
* @return String
*/
protected String getInitialText() {
return initialText;
}
/**
* Return a bold font if the given element matches the given pattern.
* Clients can opt to call this method from a Viewer's label provider to get
* a bold font for which to highlight the given element in the tree.
*
* @param element
* element for which a match should be determined
* @param tree
* FilteredTree in which the element resides
* @param filter
* PatternFilter which determines a match
*
* @return bold font
*/
public static Font getBoldFont(Object element, FilteredTree tree, PatternFilter filter) {
String filterText = tree.getFilterString();
if (filterText == null) {
return null;
}
// Do nothing if it's empty string
String initialText = tree.getInitialText();
if (!filterText.equals("") && !filterText.equals(initialText)) {//$NON-NLS-1$
if (tree.getPatternFilter() != filter) {
boolean initial = initialText != null && initialText.equals(filterText);
if (initial) {
filter.setPattern(null);
} else if (filterText != null) {
filter.setPattern(filterText);
}
}
if (filter.isElementVisible(tree.getViewer(), element) && filter.isLeafMatch(tree.getViewer(), element)) {
return JFaceResources.getFontRegistry().getBold(JFaceResources.DIALOG_FONT);
}
}
return null;
}
public boolean isShowFilterControls() {
return showFilterControls;
}
public void setShowFilterControls(boolean showFilterControls) {
this.showFilterControls = showFilterControls;
if (filterComposite != null) {
Object filterCompositeLayoutData = filterComposite.getLayoutData();
if (filterCompositeLayoutData instanceof GridData) {
((GridData) filterCompositeLayoutData).exclude = !isShowFilterControls();
} else if (filterCompositeLayoutData instanceof RowData) {
((RowData) filterCompositeLayoutData).exclude = !isShowFilterControls();
}
filterComposite.setVisible(isShowFilterControls());
layout();
}
}
/**
* Custom tree viewer subclass that clears the caches in patternFilter on
* any change to the tree. See bug 187200.
*
* @since 3.3
*
*/
class NotifyingTreeViewer extends TreeViewer {
/**
* @param parent
* @param style
*/
public NotifyingTreeViewer(Composite parent, int style) {
super(parent, style);
}
@Override
public void add(Object parentElementOrTreePath, Object childElement) {
getPatternFilter().clearCaches();
super.add(parentElementOrTreePath, childElement);
}
@Override
public void add(Object parentElementOrTreePath, Object[] childElements) {
getPatternFilter().clearCaches();
super.add(parentElementOrTreePath, childElements);
}
@Override
protected void inputChanged(Object input, Object oldInput) {
getPatternFilter().clearCaches();
super.inputChanged(input, oldInput);
}
@Override
public void insert(Object parentElementOrTreePath, Object element, int position) {
getPatternFilter().clearCaches();
super.insert(parentElementOrTreePath, element, position);
}
@Override
public void refresh() {
getPatternFilter().clearCaches();
super.refresh();
}
@Override
public void refresh(boolean updateLabels) {
getPatternFilter().clearCaches();
super.refresh(updateLabels);
}
@Override
public void refresh(Object element) {
getPatternFilter().clearCaches();
super.refresh(element);
}
@Override
public void refresh(Object element, boolean updateLabels) {
getPatternFilter().clearCaches();
super.refresh(element, updateLabels);
}
@Override
public void remove(Object elementsOrTreePaths) {
getPatternFilter().clearCaches();
super.remove(elementsOrTreePaths);
}
@Override
public void remove(Object parent, Object[] elements) {
getPatternFilter().clearCaches();
super.remove(parent, elements);
}
@Override
public void remove(Object[] elementsOrTreePaths) {
getPatternFilter().clearCaches();
super.remove(elementsOrTreePaths);
}
@Override
public void replace(Object parentElementOrTreePath, int index, Object element) {
getPatternFilter().clearCaches();
super.replace(parentElementOrTreePath, index, element);
}
@Override
public void setChildCount(Object elementOrTreePath, int count) {
getPatternFilter().clearCaches();
super.setChildCount(elementOrTreePath, count);
}
@Override
public void setContentProvider(IContentProvider provider) {
getPatternFilter().clearCaches();
super.setContentProvider(provider);
}
@Override
public void setHasChildren(Object elementOrTreePath, boolean hasChildren) {
getPatternFilter().clearCaches();
super.setHasChildren(elementOrTreePath, hasChildren);
}
}
}