org.eclipse.compare.CompareViewerPane Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 2011 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.compare;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.ListenerList;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.action.ToolBarManager;
import org.eclipse.jface.viewers.DoubleClickEvent;
import org.eclipse.jface.viewers.IDoubleClickListener;
import org.eclipse.jface.viewers.IOpenListener;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.OpenEvent;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.swt.SWT;
import org.eclipse.swt.accessibility.ACC;
import org.eclipse.swt.accessibility.AccessibleAdapter;
import org.eclipse.swt.accessibility.AccessibleEvent;
import org.eclipse.swt.custom.CLabel;
import org.eclipse.swt.custom.ViewForm;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;
/**
* A CompareViewerPane is a convenience class which installs a
* CLabel and a Toolbar in a ViewForm.
*
* Double clicking onto the CompareViewerPane's title bar maximizes
* the CompareViewerPane to the size of an enclosing Splitter
* (if there is one).
* If more Splitters are nested maximizing walks up and
* maximizes to the outermost Splitter.
*
* @since 2.0
*/
public class CompareViewerPane extends ViewForm implements ISelectionProvider,
IDoubleClickListener, ISelectionChangedListener, IOpenListener, IAdaptable {
private ToolBarManager fToolBarManager;
private Object fInput;
private ListenerList fSelectionListeners= new ListenerList<>();
private ListenerList fDoubleClickListener= new ListenerList<>();
private ListenerList fOpenListener= new ListenerList<>();
/**
* Constructs a new instance of this class given its parent
* and a style value describing its behavior and appearance.
*
* @param container a widget which will be the container of the new instance (cannot be null)
* @param style the style of widget to construct
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the parent is null
*
* @exception org.eclipse.swt.SWTException
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
*
*/
public CompareViewerPane(Composite container, int style) {
super(container, style);
marginWidth= 0;
marginHeight= 0;
Control topLeft = createTopLeft(this);
setTopLeft(topLeft);
MouseAdapter ml= new MouseAdapter() {
@Override
public void mouseDoubleClick(MouseEvent e) {
Control content= getContent();
if (content != null && content.getBounds().contains(e.x, e.y))
return;
Control parent= getParent();
if (parent instanceof Splitter)
((Splitter)parent).setMaximizedControl(CompareViewerPane.this);
}
};
addMouseListener(ml);
getTopLeft().addMouseListener(ml);
addDisposeListener(new DisposeListener() {
@Override
public void widgetDisposed(DisposeEvent e) {
if (fToolBarManager != null) {
fToolBarManager.removeAll();
fToolBarManager.dispose();
}
fInput= null;
fSelectionListeners= null;
setImage(null);
}
});
}
/**
* @param parent
* a widget which will be the parent of the control (cannot be
* null)
* @return the control to be placed in the top left corner of the pane
* @noreference This method is not intended to be referenced by clients.
* @nooverride This method is not intended to be re-implemented or extended
* by clients.
*/
protected Control createTopLeft(Composite parent) {
CLabel label = new CLabel(this, SWT.NONE) {
@Override
public Point computeSize(int wHint, int hHint, boolean changed) {
return super.computeSize(wHint, Math.max(24, hHint), changed);
}
};
return label;
}
/**
* Set the pane's title text.
* The value null clears it.
*
* @param label the text to be displayed in the pane or null
*/
public void setText(String label) {
CLabel cl= (CLabel) getTopLeft();
if (cl != null && !cl.isDisposed())
cl.setText(label);
}
/**
* Set the pane's title Image.
* The value null clears it.
*
* @param image the image to be displayed in the pane or null
*/
public void setImage(Image image) {
CLabel cl= (CLabel) getTopLeft();
if (cl != null)
cl.setImage(image);
}
/**
* Returns a ToolBarManager if the given parent is a
* CompareViewerPane or null otherwise.
*
* @param parent a Composite or null
* @return a ToolBarManager if the given parent is a CompareViewerPane otherwise null
*/
public static ToolBarManager getToolBarManager(Composite parent) {
if (parent instanceof CompareViewerPane) {
CompareViewerPane pane= (CompareViewerPane) parent;
return pane.getToolBarManager();
}
return null;
}
/**
* Clears tool items in the CompareViewerPane's control bar.
*
* @param parent a Composite or null
*/
public static void clearToolBar(Composite parent) {
ToolBarManager tbm= getToolBarManager(parent);
if (tbm != null) {
tbm.removeAll();
tbm.update(true);
}
}
//---- private stuff
private ToolBarManager getToolBarManager() {
if (fToolBarManager != null && fToolBarManager.getControl() == null)
return null;
if (fToolBarManager == null) {
final ToolBar tb = new ToolBar(this, SWT.FLAT);
setTopCenter(tb);
fToolBarManager = new ToolBarManager(tb);
tb.getAccessible().addAccessibleListener(new AccessibleAdapter() {
@Override
public void getName(AccessibleEvent e) {
if (e.childID != ACC.CHILDID_SELF) {
ToolItem item = tb.getItem(e.childID);
if (item != null) {
String toolTip = item.getToolTipText();
if (toolTip != null) {
e.result = toolTip;
}
}
}
}
});
}
return fToolBarManager;
}
/**
* Returns the current input of this pane or null if the pane has no input.
*
* @return an Object that is the input to this pane or null if the pane has no input.
*
* @since 3.3
*/
public Object getInput() {
return fInput;
}
/**
* Sets the input object of this pane.
*
* @param input the new input object or null
* @since 3.3
*/
public void setInput(Object input) {
if (fInput != input)
fInput= input;
}
@Override
public void addSelectionChangedListener(ISelectionChangedListener l) {
fSelectionListeners.add(l);
}
@Override
public void removeSelectionChangedListener(ISelectionChangedListener l) {
fSelectionListeners.remove(l);
}
@Override
public ISelection getSelection() {
return null;
}
@Override
public void setSelection(ISelection s) {
// Default is to do nothing
}
@Override
public void selectionChanged(SelectionChangedEvent ev) {
for (ISelectionChangedListener listener : fSelectionListeners) {
listener.selectionChanged(ev);
}
}
@Override
public void doubleClick(DoubleClickEvent event) {
for (IDoubleClickListener listener : fDoubleClickListener) {
listener.doubleClick(event);
}
}
/**
* Add a double-click listener to the pane. The listener will get
* invoked when the contents of the pane are double-clicked. Adding
* a listener that is already registered has no effect.
* @param listener the listener
* @since 3.3
*/
public void addDoubleClickListener(IDoubleClickListener listener) {
fDoubleClickListener.add(listener);
}
/**
* Remove a double-click listener. Removing a listener that is not
* registered has no effect.
* @param listener the listener
* @since 3.3
*/
public void removeDoubleClickListener(IDoubleClickListener listener) {
fDoubleClickListener.remove(listener);
}
/**
* Add an open listener to the pane. The listener will get
* invoked when the contents of the pane are double-clicked. Adding
* a listener that is already registered has no effect.
* @param listener the listener
* @since 3.3
*/
public void addOpenListener(IOpenListener listener) {
fOpenListener.add(listener);
}
/**
* Remove an open listener. Removing a listener that is not
* registered has no effect.
* @param listener the listener
* @since 3.3
*/
public void removeOpenListener(IOpenListener listener) {
fOpenListener.remove(listener);
}
@Override
public void open(OpenEvent event) {
Object[] listeners= fOpenListener.getListeners();
for (int i= 0; i < listeners.length; i++)
((IOpenListener) listeners[i]).open(event);
}
@Override
public T getAdapter(Class adapter) {
return Platform.getAdapterManager().getAdapter(this, adapter);
}
}