/*******************************************************************************
* Copyright (c) 2000, 2010 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.text.information;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.events.ControlListener;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.FocusListener;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.KeyListener;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.util.Geometry;
import org.eclipse.jface.text.AbstractInformationControlManager;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocumentExtension3;
import org.eclipse.jface.text.IInformationControl;
import org.eclipse.jface.text.IInformationControlCreator;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.ITextViewerExtension5;
import org.eclipse.jface.text.IViewportListener;
import org.eclipse.jface.text.IWidgetTokenKeeper;
import org.eclipse.jface.text.IWidgetTokenKeeperExtension;
import org.eclipse.jface.text.IWidgetTokenOwner;
import org.eclipse.jface.text.IWidgetTokenOwnerExtension;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.TextUtilities;
/**
* Standard implementation of <code>IInformationPresenter</code>.
* This implementation extends <code>AbstractInformationControlManager</code>.
* The information control is made visible on request by calling
* {@link #showInformationControl(Rectangle)}.
* <p>
* Usually, clients instantiate this class and configure it before using it. The configuration
* must be consistent: This means the used {@link org.eclipse.jface.text.IInformationControlCreator}
* must create an information control expecting information in the same format the configured
* {@link org.eclipse.jface.text.information.IInformationProvider}s use to encode the information they provide.
* </p>
*
* @since 2.0
*/
public class InformationPresenter extends AbstractInformationControlManager implements IInformationPresenter, IInformationPresenterExtension, IWidgetTokenKeeper, IWidgetTokenKeeperExtension {
/**
* Priority of the info controls managed by this information presenter.
* Default value: <code>5</code>.
*
* @since 3.0
*/
/*
* 5 as value has been chosen in order to beat the hovers of {@link org.eclipse.jface.text.TextViewerHoverManager}
*/
public static final int WIDGET_PRIORITY= 5;
/**
* Internal information control closer. Listens to several events issued by its subject control
* and closes the information control when necessary.
*/
class Closer implements IInformationControlCloser, ControlListener, MouseListener, FocusListener, IViewportListener, KeyListener {
/** The subject control. */
private Control fSubjectControl;
/** The information control. */
private IInformationControl fInformationControlToClose;
/** Indicates whether this closer is active. */
private boolean fIsActive= false;
@Override
public void setSubjectControl(Control control) {
fSubjectControl= control;
}
@Override
public void setInformationControl(IInformationControl control) {
fInformationControlToClose= control;
}
@Override
public void start(Rectangle informationArea) {
if (fIsActive)
return;
fIsActive= true;
if (fSubjectControl != null && !fSubjectControl.isDisposed()) {
fSubjectControl.addControlListener(this);
fSubjectControl.addMouseListener(this);
fSubjectControl.addFocusListener(this);
fSubjectControl.addKeyListener(this);
}
if (fInformationControlToClose != null)
fInformationControlToClose.addFocusListener(this);
fTextViewer.addViewportListener(this);
}
@Override
public void stop() {
if (!fIsActive)
return;
fIsActive= false;
fTextViewer.removeViewportListener(this);
if (fInformationControlToClose != null)
fInformationControlToClose.removeFocusListener(this);
if (fSubjectControl != null && !fSubjectControl.isDisposed()) {
fSubjectControl.removeControlListener(this);
fSubjectControl.removeMouseListener(this);
fSubjectControl.removeFocusListener(this);
fSubjectControl.removeKeyListener(this);
}
}
@Override
public void controlResized(ControlEvent e) {
hideInformationControl();
}
@Override
public void controlMoved(ControlEvent e) {
hideInformationControl();
}
@Override
public void mouseDown(MouseEvent e) {
hideInformationControl();
}
@Override
public void mouseUp(MouseEvent e) {
}
@Override
public void mouseDoubleClick(MouseEvent e) {
hideInformationControl();
}
@Override
public void focusGained(FocusEvent e) {
}
@Override
public void focusLost(FocusEvent e) {
Display d= fSubjectControl.getDisplay();
d.asyncExec(new Runnable() {
// Without the asyncExec, mouse clicks to the workbench window are swallowed.
@Override
public void run() {
if (fInformationControlToClose == null || !fInformationControlToClose.isFocusControl())
hideInformationControl();
}
});
}
@Override
public void viewportChanged(int topIndex) {
hideInformationControl();
}
@Override
public void keyPressed(KeyEvent e) {
hideInformationControl();
}
@Override
public void keyReleased(KeyEvent e) {
}
}
/** The text viewer this information presenter works on */
private ITextViewer fTextViewer;
/** The map of <code>IInformationProvider</code> objects */
private Map<String, IInformationProvider> fProviders;
/** The offset to override selection. */
private int fOffset= -1;
/**
* The document partitioning for this information presenter.
* @since 3.0
*/
private String fPartitioning;
/**
* Creates a new information presenter that uses the given information control creator.
* The presenter is not installed on any text viewer yet. By default, an information
* control closer is set that closes the information control in the event of key strokes,
* resizing, moves, focus changes, mouse clicks, and disposal - all of those applied to
* the information control's parent control. Also, the setup ensures that the information
* control when made visible will request the focus. By default, the default document
* partitioning {@link IDocumentExtension3#DEFAULT_PARTITIONING} is used.
*
* @param creator the information control creator to be used
*/
public InformationPresenter(IInformationControlCreator creator) {
super(creator);
setCloser(new Closer());
takesFocusWhenVisible(true);
fPartitioning= IDocumentExtension3.DEFAULT_PARTITIONING;
}
/**
* Sets the document partitioning to be used by this information presenter.
*
* @param partitioning the document partitioning to be used by this information presenter
* @since 3.0
*/
public void setDocumentPartitioning(String partitioning) {
Assert.isNotNull(partitioning);
fPartitioning= partitioning;
}
@Override
public String getDocumentPartitioning() {
return fPartitioning;
}
/**
* Registers a given information provider for a particular content type.
* If there is already a provider registered for this type, the new provider
* is registered instead of the old one.
*
* @param provider the information provider to register, or <code>null</code> to remove an existing one
* @param contentType the content type under which to register
*/
public void setInformationProvider(IInformationProvider provider, String contentType) {
Assert.isNotNull(contentType);
if (fProviders == null)
fProviders= new HashMap<>();
if (provider == null)
fProviders.remove(contentType);
else
fProviders.put(contentType, provider);
}
@Override
public IInformationProvider getInformationProvider(String contentType) {
if (fProviders == null)
return null;
return fProviders.get(contentType);
}
/**
* Sets a offset to override the selection. Setting the value to <code>-1</code> will disable
* overriding.
*
* @param offset the offset to override selection or <code>-1</code>
*/
public void setOffset(int offset) {
fOffset= offset;
}
@Override
protected void computeInformation() {
int offset= fOffset < 0 ? fTextViewer.getSelectedRange().x : fOffset;
if (offset == -1)
return;
fOffset= -1;
IInformationProvider provider= null;
try {
String contentType= TextUtilities.getContentType(fTextViewer.getDocument(), getDocumentPartitioning(), offset, true);
provider= getInformationProvider(contentType);
} catch (BadLocationException x) {
}
if (provider == null)
return;
IRegion subject= provider.getSubject(fTextViewer, offset);
if (subject == null)
return;
Object info;
if (provider instanceof IInformationProviderExtension) {
IInformationProviderExtension extension= (IInformationProviderExtension) provider;
info= extension.getInformation2(fTextViewer, subject);
} else {
// backward compatibility code
info= provider.getInformation(fTextViewer, subject);
}
if (provider instanceof IInformationProviderExtension2)
setCustomInformationControlCreator(((IInformationProviderExtension2) provider).getInformationPresenterControlCreator());
else
setCustomInformationControlCreator(null);
setInformation(info, computeArea(subject));
}
/**
* Determines the graphical area covered by the given text region.
*
* @param region the region whose graphical extend must be computed
* @return the graphical extend of the given region
*/
private Rectangle computeArea(IRegion region) {
int start= 0;
int end= 0;
IRegion widgetRegion= modelRange2WidgetRange(region);
if (widgetRegion != null) {
start= widgetRegion.getOffset();
end= widgetRegion.getOffset() + widgetRegion.getLength();
}
StyledText styledText= fTextViewer.getTextWidget();
Rectangle bounds;
if (end > 0 && start < end)
bounds= styledText.getTextBounds(start, end - 1);
else {
Point loc= styledText.getLocationAtOffset(start);
bounds= new Rectangle(loc.x, loc.y, 0, styledText.getLineHeight(start));
}
Rectangle clientArea= styledText.getClientArea();
Geometry.moveInside(bounds, clientArea);
return bounds;
}
/**
* Translated the given range in the viewer's document into the corresponding
* range of the viewer's widget.
*
* @param region the range in the viewer's document
* @return the corresponding widget range
* @since 2.1
*/
private IRegion modelRange2WidgetRange(IRegion region) {
if (fTextViewer instanceof ITextViewerExtension5) {
ITextViewerExtension5 extension= (ITextViewerExtension5) fTextViewer;
return extension.modelRange2WidgetRange(region);
}
IRegion visibleRegion= fTextViewer.getVisibleRegion();
int start= region.getOffset() - visibleRegion.getOffset();
int end= start + region.getLength();
if (end > visibleRegion.getLength())
end= visibleRegion.getLength();
return new Region(start, end - start);
}
@Override
public void install(ITextViewer textViewer) {
fTextViewer= textViewer;
install(fTextViewer.getTextWidget());
}
@Override
public void uninstall() {
dispose();
}
@Override
protected void showInformationControl(Rectangle subjectArea) {
if (fTextViewer instanceof IWidgetTokenOwnerExtension && fTextViewer instanceof IWidgetTokenOwner) {
IWidgetTokenOwnerExtension extension= (IWidgetTokenOwnerExtension) fTextViewer;
if (extension.requestWidgetToken(this, WIDGET_PRIORITY))
super.showInformationControl(subjectArea);
} else if (fTextViewer instanceof IWidgetTokenOwner) {
IWidgetTokenOwner owner= (IWidgetTokenOwner) fTextViewer;
if (owner.requestWidgetToken(this))
super.showInformationControl(subjectArea);
} else
super.showInformationControl(subjectArea);
}
@Override
protected void hideInformationControl() {
try {
super.hideInformationControl();
} finally {
if (fTextViewer instanceof IWidgetTokenOwner) {
IWidgetTokenOwner owner= (IWidgetTokenOwner) fTextViewer;
owner.releaseWidgetToken(this);
}
}
}
@Override
protected void handleInformationControlDisposed() {
try {
super.handleInformationControlDisposed();
} finally {
if (fTextViewer instanceof IWidgetTokenOwner) {
IWidgetTokenOwner owner= (IWidgetTokenOwner) fTextViewer;
owner.releaseWidgetToken(this);
}
}
}
@Override
public boolean requestWidgetToken(IWidgetTokenOwner owner) {
return false;
}
@Override
public boolean requestWidgetToken(IWidgetTokenOwner owner, int priority) {
return false;
}
@Override
public boolean setFocus(IWidgetTokenOwner owner) {
return false;
}
}