descent.internal.ui.refactoring.reorg.ReorgUserInputPage.java Source code

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Here is the source code for descent.internal.ui.refactoring.reorg.ReorgUserInputPage.java

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/*******************************************************************************
 * Copyright (c) 2000, 2005 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 descent.internal.ui.refactoring.reorg;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;

import org.eclipse.ltk.core.refactoring.RefactoringStatus;
import org.eclipse.ltk.ui.refactoring.UserInputWizardPage;

import descent.core.IJavaElement;
import descent.core.JavaCore;
import descent.core.JavaModelException;

import descent.internal.corext.refactoring.reorg.IReorgDestinationValidator;
import descent.internal.corext.util.Messages;

import descent.ui.JavaElementLabelProvider;
import descent.ui.JavaElementLabels;
import descent.ui.JavaElementSorter;

import descent.internal.ui.JavaPlugin;

abstract class ReorgUserInputPage extends UserInputWizardPage {
    private static final long LABEL_FLAGS = JavaElementLabels.ALL_DEFAULT | JavaElementLabels.M_PRE_RETURNTYPE
            | JavaElementLabels.M_PARAMETER_NAMES | JavaElementLabels.F_PRE_TYPE_SIGNATURE;
    private TreeViewer fViewer;

    public ReorgUserInputPage(String pageName) {
        super(pageName);
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.dialogs.IDialogPage#createControl(org.eclipse.swt.widgets.Composite)
     */
    public void createControl(Composite parent) {
        initializeDialogUnits(parent);
        Composite result = new Composite(parent, SWT.NONE);
        setControl(result);
        result.setLayout(new GridLayout());

        Object initialSelection = getInitiallySelectedElement();
        verifyDestination(initialSelection, true);

        addLabel(result);

        fViewer = createViewer(result);
        fViewer.setSelection(new StructuredSelection(initialSelection), true);
        fViewer.addSelectionChangedListener(new ISelectionChangedListener() {
            public void selectionChanged(SelectionChangedEvent event) {
                ReorgUserInputPage.this.viewerSelectionChanged(event);
            }
        });
        Dialog.applyDialogFont(result);
    }

    protected Control addLabel(Composite parent) {
        Label label = new Label(parent, SWT.NONE);
        String text;
        int resources = getResources().length;
        int javaElements = getJavaElements().length;

        if (resources == 0 && javaElements == 1) {
            text = Messages.format(ReorgMessages.ReorgUserInputPage_choose_destination_single,
                    JavaElementLabels.getElementLabel(getJavaElements()[0], LABEL_FLAGS));
        } else if (resources == 1 && javaElements == 0) {
            text = Messages.format(ReorgMessages.ReorgUserInputPage_choose_destination_single,
                    getResources()[0].getName());
        } else {
            text = Messages.format(ReorgMessages.ReorgUserInputPage_choose_destination_multi,
                    String.valueOf(resources + javaElements));
        }

        label.setText(text);
        label.setLayoutData(new GridData(SWT.BEGINNING, SWT.END, false, false));
        return label;
    }

    private void viewerSelectionChanged(SelectionChangedEvent event) {
        ISelection selection = event.getSelection();
        if (!(selection instanceof IStructuredSelection))
            return;
        IStructuredSelection ss = (IStructuredSelection) selection;
        verifyDestination(ss.getFirstElement(), false);
    }

    protected abstract Object getInitiallySelectedElement();

    /** Set and verify destination */
    protected abstract RefactoringStatus verifyDestination(Object selected) throws JavaModelException;

    protected abstract IResource[] getResources();

    protected abstract IJavaElement[] getJavaElements();

    protected abstract IReorgDestinationValidator getDestinationValidator();

    private final void verifyDestination(Object selected, boolean initialVerification) {
        try {
            RefactoringStatus status = verifyDestination(selected);
            if (initialVerification)
                setPageComplete(status.isOK());
            else
                setPageComplete(status);
        } catch (JavaModelException e) {
            JavaPlugin.log(e);
            setPageComplete(false);
        }
    }

    private TreeViewer createViewer(Composite parent) {
        TreeViewer treeViewer = new TreeViewer(parent, SWT.SINGLE | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
        GridData gd = new GridData(GridData.FILL_BOTH);
        gd.widthHint = convertWidthInCharsToPixels(40);
        gd.heightHint = convertHeightInCharsToPixels(15);
        treeViewer.getTree().setLayoutData(gd);
        treeViewer.setLabelProvider(new JavaElementLabelProvider(JavaElementLabelProvider.SHOW_SMALL_ICONS));
        treeViewer.setContentProvider(new DestinationContentProvider(getDestinationValidator()));
        treeViewer.setSorter(new JavaElementSorter());
        treeViewer.setInput(JavaCore.create(ResourcesPlugin.getWorkspace().getRoot()));
        return treeViewer;
    }

    protected TreeViewer getTreeViewer() {
        return fViewer;
    }
}