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/*******************************************************************************
* Copyright (c) 2005, 2007 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:
* P.Tomaszewski
* Anton Leherbauer (Wind River Systems)
* Markus Schorn (Wind River Systems)
*******************************************************************************/
package org.eclipse.cdt.internal.ui.actions;
import java.util.ResourceBundle;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.ui.texteditor.TextEditorAction;
import org.eclipse.cdt.core.model.CModelException;
import org.eclipse.cdt.core.model.ICElement;
import org.eclipse.cdt.core.model.IParent;
import org.eclipse.cdt.core.model.ISourceRange;
import org.eclipse.cdt.core.model.ISourceReference;
import org.eclipse.cdt.core.model.IWorkingCopy;
import org.eclipse.cdt.ui.CUIPlugin;
import org.eclipse.cdt.internal.ui.editor.CEditor;
/**
* Gives possibility to move fast between member elements of the c/c++ source.
*
* @author P.Tomaszewski
*/
public class GoToNextPreviousMemberAction extends TextEditorAction {
public static final String NEXT_MEMBER = "GotoNextMember"; //$NON-NLS-1$
public static final String PREVIOUS_MEMBER = "GotoPrevMember"; //$NON-NLS-1$
/** Determines should action take user to the next member or to the previous one. */
private boolean fGotoNext;
/**
* Creates new action.
* @param bundle Resource bundle.
* @param prefix Prefix.
* @param editor Editor.
* @param gotoNext Is it go to next or previous action.
*/
public GoToNextPreviousMemberAction(ResourceBundle bundle, String prefix, ITextEditor editor, boolean gotoNext) {
super(bundle, prefix, editor);
fGotoNext = gotoNext;
}
/**
* Creates new action.
* @param bundle Resource bundle.
* @param prefix Prefix.
* @param editor Editor.
* @param style UI style.
* @param gotoNext Is it go to next or previous action.
*/
public GoToNextPreviousMemberAction(ResourceBundle bundle, String prefix, ITextEditor editor, int style, boolean gotoNext) {
super(bundle, prefix, editor, style);
fGotoNext = gotoNext;
}
/*
* @see org.eclipse.ui.texteditor.TextEditorAction#update()
*/
public void update() {
final ITextEditor editor = getTextEditor();
setEnabled(editor instanceof CEditor && ((CEditor)editor).getInputCElement() != null);
}
/**
* @see org.eclipse.jface.action.Action#run()
*/
public void run() {
final CEditor editor = (CEditor) getTextEditor();
final ITextSelection selection = (ITextSelection) editor.getSelectionProvider().getSelection();
final IEditorInput editorInput = editor.getEditorInput();
final IWorkingCopy workingCopy = CUIPlugin.getDefault().getWorkingCopyManager().getWorkingCopy(editorInput);
if (workingCopy == null) {
return;
}
try {
ISourceReference next= fGotoNext ?
getNextElement(workingCopy, selection.getOffset()) :
getPrevElement(workingCopy, selection.getOffset());
if (next != null) {
editor.selectAndReveal(next.getSourceRange().getIdStartPos(), 0);
}
} catch (CModelException e) {
CUIPlugin.log(e);
}
}
private ISourceReference getNextElement(IParent parent, int offset) throws CModelException {
ICElement[] children= parent.getChildren();
for (int i = 0; i < children.length; i++) {
ICElement element = children[i];
if (element instanceof ISourceReference) {
final ISourceReference candidate1= (ISourceReference) element;
final ISourceRange range= candidate1.getSourceRange();
final int idpos1= range.getIdStartPos();
if (element instanceof IParent && range.getStartPos() + range.getLength() > offset) {
ISourceReference candidate2= getNextElement((IParent) element, offset);
if (candidate2 != null) {
final int idpos2= candidate2.getSourceRange().getIdStartPos();
if (idpos1 <= offset || idpos1 > idpos2) {
return candidate2;
}
}
}
if (idpos1 > offset) {
return candidate1;
}
}
}
return null;
}
private ISourceReference getPrevElement(IParent parent, int offset) throws CModelException {
ICElement[] children= parent.getChildren();
for (int i= children.length-1; i >= 0; i--) {
ICElement element = children[i];
if (element instanceof ISourceReference) {
final ISourceReference candidate1= (ISourceReference) element;
final ISourceRange range= candidate1.getSourceRange();
final int idpos1= range.getIdStartPos();
if (element instanceof IParent && range.getStartPos() < offset) {
ISourceReference candidate2= getPrevElement((IParent) element, offset);
if (candidate2 != null) {
final int idpos2= candidate2.getSourceRange().getIdStartPos();
if (idpos1 >= offset || idpos1 < idpos2) {
return candidate2;
}
}
}
if (idpos1 < offset) {
return candidate1;
}
}
}
return null;
}
}
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