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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Eclipse Public License, Version 1.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.eclipse.org/org/documents/epl-v10.php
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.ide.eclipse.adt.internal.editors.layout.refactoring;
import com.android.ide.eclipse.adt.AdtConstants;
import com.android.ide.eclipse.adt.AdtPlugin;
import com.android.ide.eclipse.adt.AdtUtils;
import com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditorDelegate;
import com.android.ide.eclipse.adt.internal.editors.layout.gle2.CanvasViewInfo;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ITreeSelection;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IEditorSite;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;
import org.eclipse.ui.part.FileEditorInput;
abstract class VisualRefactoringAction implements IWorkbenchWindowActionDelegate {
protected IWorkbenchWindow mWindow;
protected ITextSelection mTextSelection;
protected ITreeSelection mTreeSelection;
protected LayoutEditorDelegate mDelegate;
protected IFile mFile;
/**
* Keep track of the current workbench window.
*/
@Override
public void init(IWorkbenchWindow window) {
mWindow = window;
}
@Override
public void dispose() {
}
/**
* Examine the selection to determine if the action should be enabled or not.
* <p/>
* Keep a link to the relevant selection structure
*/
@Override
public void selectionChanged(IAction action, ISelection selection) {
// Look for selections in XML and in the layout UI editor
// Note, two kinds of selections are returned here:
// ITextSelection on a Java source window
// IStructuredSelection in the outline or navigator
// This simply deals with the refactoring based on a non-empty selection.
// At that point, just enable the action and later decide if it's valid when it actually
// runs since we don't have access to the AST yet.
mTextSelection = null;
mTreeSelection = null;
mFile = null;
IEditorPart editor = null;
if (selection instanceof ITextSelection) {
mTextSelection = (ITextSelection) selection;
editor = AdtUtils.getActiveEditor();
mFile = getSelectedFile(editor);
} else if (selection instanceof ITreeSelection) {
Object firstElement = ((ITreeSelection)selection).getFirstElement();
if (firstElement instanceof CanvasViewInfo) {
mTreeSelection = (ITreeSelection) selection;
editor = AdtUtils.getActiveEditor();
mFile = getSelectedFile(editor);
}
}
mDelegate = LayoutEditorDelegate.fromEditor(editor);
action.setEnabled((mTextSelection != null || mTreeSelection != null)
&& mFile != null && mDelegate != null);
}
/**
* Create a new instance of our refactoring and a wizard to configure it.
*/
@Override
public abstract void run(IAction action);
/**
* Returns the active {@link IFile} (hopefully matching our selection) or null.
* The file is only returned if it's a file from a project with an Android nature.
* <p/>
* At that point we do not try to analyze if the selection nor the file is suitable
* for the refactoring. This check is performed when the refactoring is invoked since
* it can then produce meaningful error messages as needed.
*/
private IFile getSelectedFile(IEditorPart editor) {
if (editor != null) {
IEditorInput input = editor.getEditorInput();
if (input instanceof FileEditorInput) {
FileEditorInput fi = (FileEditorInput) input;
IFile file = fi.getFile();
if (file.exists()) {
IProject proj = file.getProject();
try {
if (proj != null && proj.hasNature(AdtConstants.NATURE_DEFAULT)) {
return file;
}
} catch (CoreException e) {
// ignore
}
}
}
}
return null;
}
public static IAction create(String title, LayoutEditorDelegate editorDelegate,
Class<? extends VisualRefactoringAction> clz) {
return new ActionWrapper(title, editorDelegate, clz);
}
private static class ActionWrapper extends Action {
private Class<? extends VisualRefactoringAction> mClass;
private LayoutEditorDelegate mEditorDelegate;
ActionWrapper(String title, LayoutEditorDelegate editorDelegate,
Class<? extends VisualRefactoringAction> clz) {
super(title);
mEditorDelegate = editorDelegate;
mClass = clz;
}
@Override
public void run() {
VisualRefactoringAction action;
try {
action = mClass.newInstance();
} catch (Exception e) {
AdtPlugin.log(e, null);
return;
}
IEditorSite site = mEditorDelegate.getEditor().getEditorSite();
action.init(site.getWorkbenchWindow());
ISelection selection = site.getSelectionProvider().getSelection();
action.selectionChanged(ActionWrapper.this, selection);
if (isEnabled()) {
action.run(ActionWrapper.this);
}
}
}
}
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