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/*******************************************************************************
* Copyright (c) 2000, 2018 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.ui.texteditor;
import java.util.ResourceBundle;
import org.eclipse.swt.custom.BusyIndicator;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.jface.text.ITextOperationTarget;
import org.eclipse.jface.text.ITextOperationTargetExtension;
import org.eclipse.jface.text.source.ISourceViewer;
import org.eclipse.ui.IWorkbenchPartSite;
/**
* A content assist action which gets its target from its text editor.
* <p>
* The action is initially associated with a text editor via the constructor,
* but can subsequently be changed using <code>setEditor</code>.</p>
* <p>
* If this class is used as is, it works by asking the text editor for its text operation target
* (using <code>getAdapter(ITextOperationTarget.class)</code> and runs the content assist
* operation on this target.
* </p>
* @since 2.0
*/
public final class ContentAssistAction extends TextEditorAction {
/** The text operation target */
private ITextOperationTarget fOperationTarget;
/**
* Creates and initializes the action for the given text editor.
* The action configures its visual representation from the given resource
* bundle. The action works by asking the text editor at the time for its
* text operation target adapter (using
* <code>getAdapter(ITextOperationTarget.class)</code>. The action runs the
* content assist operation on this target.
*
* @param bundle the resource bundle
* @param prefix a prefix to be prepended to the various resource keys
* (described in <code>ResourceAction</code> constructor), or
* <code>null</code> if none
* @param editor the text editor
* @see ResourceAction#ResourceAction(ResourceBundle, String)
*/
public ContentAssistAction(ResourceBundle bundle, String prefix, ITextEditor editor) {
super(bundle, prefix, editor);
}
/**
* Runs the content assist operation on the editor's text operation target.
*/
@Override
public void run() {
if (fOperationTarget != null) {
ITextEditor editor= getTextEditor();
if (editor != null && validateEditorInputState()) {
Display display= null;
IWorkbenchPartSite site= editor.getSite();
Shell shell= site.getShell();
if (shell != null && !shell.isDisposed())
display= shell.getDisplay();
BusyIndicator.showWhile(display,
() -> fOperationTarget.doOperation(ISourceViewer.CONTENTASSIST_PROPOSALS));
}
}
}
/**
* The <code>ContentAssistAction</code> implementation of this
* <code>IUpdate</code> method discovers the operation through the current
* editor's <code>ITextOperationTarget</code> adapter, and sets the
* enabled state accordingly.
*/
@Override
public void update() {
ITextEditor editor= getTextEditor();
if (fOperationTarget == null && editor!= null)
fOperationTarget= editor.getAdapter(ITextOperationTarget.class);
if (fOperationTarget == null) {
setEnabled(false);
return;
}
if (fOperationTarget instanceof ITextOperationTargetExtension) {
ITextOperationTargetExtension targetExtension= (ITextOperationTargetExtension) fOperationTarget;
targetExtension.enableOperation(ISourceViewer.CONTENTASSIST_PROPOSALS, canModifyEditor());
}
setEnabled(fOperationTarget.canDoOperation(ISourceViewer.CONTENTASSIST_PROPOSALS));
}
/**
* @see TextEditorAction#setEditor(ITextEditor)
*/
@Override
public void setEditor(ITextEditor editor) {
super.setEditor(editor);
fOperationTarget= null;
}
}
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