org.eclipse.wst.xsl.ui.internal.wizards.NewXSLFileTemplatesWizardPage.java Source code

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/*******************************************************************************
 * Copyright (c) 2008, 2010 Chase Technology Ltd - http://www.chasetechnology.co.uk
 * 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:
 *     Doug Satchwell (Chase Technology Ltd) - initial API and implementation
 *     David Carver (bug 271916) STAR - externalize strings for New XSL.
 *     Jesper Steen Moller - bug 289799 - React to the 'cursor' variable in the template
 *******************************************************************************/
package org.eclipse.wst.xsl.ui.internal.wizards;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.preference.PreferenceDialog;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.source.ISourceViewer;
import org.eclipse.jface.text.source.SourceViewer;
import org.eclipse.jface.text.source.SourceViewerConfiguration;
import org.eclipse.jface.text.templates.DocumentTemplateContext;
import org.eclipse.jface.text.templates.Template;
import org.eclipse.jface.text.templates.TemplateBuffer;
import org.eclipse.jface.text.templates.TemplateContext;
import org.eclipse.jface.text.templates.TemplateContextType;
import org.eclipse.jface.text.templates.TemplateVariable;
import org.eclipse.jface.text.templates.persistence.TemplateStore;
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.TableLayout;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerSorter;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Link;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.ui.dialogs.PreferencesUtil;
import org.eclipse.wst.sse.core.StructuredModelManager;
import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel;
import org.eclipse.wst.sse.ui.StructuredTextViewerConfiguration;
import org.eclipse.wst.sse.ui.internal.StructuredTextViewer;
import org.eclipse.wst.sse.ui.internal.provisional.style.LineStyleProvider;
import org.eclipse.wst.xml.core.internal.provisional.contenttype.ContentTypeIdForXML;
import org.eclipse.wst.xsl.ui.internal.Messages;
import org.eclipse.wst.xsl.ui.internal.StructuredTextViewerConfigurationXSL;
import org.eclipse.wst.xsl.ui.internal.XSLUIConstants;
import org.eclipse.wst.xsl.ui.internal.XSLUIPlugin;

public class NewXSLFileTemplatesWizardPage extends WizardPage {
    private static final String XSL_UI_TEMPLATE_PREFERENCE_PAGE = "org.eclipse.wst.xsl.ui.template.preferencePage"; //$NON-NLS-1$
    private static final String NEW_STYLESHEET_TEMPLATES_WIZARD_PAGE = "NewStylesheetTemplatesWizardPage"; //$NON-NLS-1$
    private String fLastSelectedTemplateName;
    private SourceViewer fPatternViewer;
    private TableViewer fTableViewer;
    private TemplateStore fTemplateStore;
    private Button fUseTemplateButton;

    public NewXSLFileTemplatesWizardPage() {
        super(NEW_STYLESHEET_TEMPLATES_WIZARD_PAGE, Messages.NewXSLSelectTemplate, null);
        setDescription(Messages.NewXSLTemplateDescription);
    }

    private void configureTableResizing(final Composite parent, final Table table, final TableColumn column1,
            final TableColumn column2) {
        parent.addControlListener(new ControlAdapter() {
            @Override
            public void controlResized(ControlEvent e) {
                Rectangle area = parent.getClientArea();
                Point preferredSize = table.computeSize(SWT.DEFAULT, SWT.DEFAULT);
                int width = area.width - 2 * table.getBorderWidth();
                if (preferredSize.y > area.height) {
                    // Subtract the scrollbar width from the total column
                    // width
                    // if a vertical scrollbar will be required
                    Point vBarSize = table.getVerticalBar().getSize();
                    width -= vBarSize.x;
                }

                Point oldSize = table.getSize();
                if (oldSize.x > width) {
                    // table is getting smaller so make the columns
                    // smaller first and then resize the table to
                    // match the client area width
                    column1.setWidth(width / 2);
                    column2.setWidth(width / 2);
                    table.setSize(width, area.height);
                } else {
                    // table is getting bigger so make the table
                    // bigger first and then make the columns wider
                    // to match the client area width
                    table.setSize(width, area.height);
                    column1.setWidth(width / 2);
                    column2.setWidth(width / 2);
                }
            }
        });
    }

    public void createControl(Composite ancestor) {
        Composite parent = new Composite(ancestor, SWT.NONE);
        GridLayout layout = new GridLayout();
        layout.numColumns = 2;
        parent.setLayout(layout);

        // create checkbox for user to use JSP Template
        fUseTemplateButton = new Button(parent, SWT.CHECK);
        fUseTemplateButton.setText(Messages.NewXSLUseTemplateButtonText);
        GridData data = new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1);
        fUseTemplateButton.setLayoutData(data);
        fUseTemplateButton.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                enableTemplates();
            }
        });

        // create composite for Templates table
        Composite innerParent = new Composite(parent, SWT.NONE);
        GridLayout innerLayout = new GridLayout();
        innerLayout.numColumns = 2;
        innerLayout.marginHeight = 0;
        innerLayout.marginWidth = 0;
        innerParent.setLayout(innerLayout);
        GridData gd = new GridData(SWT.FILL, SWT.FILL, true, true, 2, 1);
        innerParent.setLayoutData(gd);

        // Create linked text to just to templates preference page
        Link link = new Link(innerParent, SWT.NONE);
        link.setText(Messages.NewXSLLinkPreferencePage);
        data = new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1);
        link.setLayoutData(data);
        link.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                linkClicked();
            }
        });

        // create table that displays templates
        Table table = new Table(innerParent, SWT.BORDER | SWT.FULL_SELECTION);

        data = new GridData(GridData.FILL_BOTH);
        data.widthHint = convertWidthInCharsToPixels(2);
        data.heightHint = convertHeightInCharsToPixels(10);
        data.horizontalSpan = 2;
        table.setLayoutData(data);
        table.setHeaderVisible(true);
        table.setLinesVisible(true);
        TableLayout tableLayout = new TableLayout();
        table.setLayout(tableLayout);

        TableColumn column1 = new TableColumn(table, SWT.NONE);
        column1.setText(Messages.NewXSLColumnTemplateName);

        TableColumn column2 = new TableColumn(table, SWT.NONE);
        column2.setText(Messages.NewXSLColumnTemplateDescription);

        fTableViewer = new TableViewer(table);
        fTableViewer.setLabelProvider(new TemplateLabelProvider());
        fTableViewer.setContentProvider(new TemplateContentProvider());

        fTableViewer.setSorter(new ViewerSorter() {
            @Override
            public int compare(Viewer viewer, Object object1, Object object2) {
                if ((object1 instanceof Template) && (object2 instanceof Template)) {
                    Template left = (Template) object1;
                    Template right = (Template) object2;
                    int result = left.getName().compareToIgnoreCase(right.getName());
                    if (result != 0)
                        return result;
                    return left.getDescription().compareToIgnoreCase(right.getDescription());
                }
                return super.compare(viewer, object1, object2);
            }

            @Override
            public boolean isSorterProperty(Object element, String property) {
                return true;
            }
        });

        fTableViewer.addSelectionChangedListener(new ISelectionChangedListener() {
            public void selectionChanged(SelectionChangedEvent e) {
                updateViewerInput();
            }
        });

        // create viewer that displays currently selected template's contents
        fPatternViewer = doCreateViewer(parent);

        fTemplateStore = XSLUIPlugin.getDefault().getTemplateStore();
        fTableViewer.setInput(fTemplateStore);

        configureTableResizing(innerParent, table, column1, column2);
        loadLastSavedPreferences();

        // PlatformUI.getWorkbench().getHelpSystem().setHelp(parent, IHelpContextIds.JSP_NEWWIZARD_TEMPLATE_HELPID);
        Dialog.applyDialogFont(parent);
        setControl(parent);
    }

    private SourceViewer createViewer(Composite parent) {
        SourceViewerConfiguration sourceViewerConfiguration = new StructuredTextViewerConfiguration() {
            StructuredTextViewerConfiguration baseConfiguration = new StructuredTextViewerConfigurationXSL();

            @Override
            public String[] getConfiguredContentTypes(ISourceViewer sourceViewer) {
                return baseConfiguration.getConfiguredContentTypes(sourceViewer);
            }

            @Override
            public LineStyleProvider[] getLineStyleProviders(ISourceViewer sourceViewer, String partitionType) {
                return baseConfiguration.getLineStyleProviders(sourceViewer, partitionType);
            }
        };
        SourceViewer viewer = new StructuredTextViewer(parent, null, null, false,
                SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
        viewer.getTextWidget().setFont(JFaceResources.getFont("org.eclipse.wst.sse.ui.textfont")); //$NON-NLS-1$
        IStructuredModel scratchModel = StructuredModelManager.getModelManager()
                .createUnManagedStructuredModelFor(ContentTypeIdForXML.ContentTypeID_XML);
        IDocument document = scratchModel.getStructuredDocument();
        viewer.configure(sourceViewerConfiguration);
        viewer.setDocument(document);
        return viewer;
    }

    private SourceViewer doCreateViewer(Composite parent) {
        Label label = new Label(parent, SWT.NONE);
        label.setText(Messages.NewXSLTemplatePreviewTitle);
        GridData data = new GridData();
        data.horizontalSpan = 2;
        label.setLayoutData(data);

        SourceViewer viewer = createViewer(parent);
        viewer.setEditable(false);

        Control control = viewer.getControl();
        data = new GridData(GridData.FILL_BOTH);
        data.horizontalSpan = 2;
        data.heightHint = convertHeightInCharsToPixels(5);
        control.setLayoutData(data);

        return viewer;
    }

    void enableTemplates() {
        boolean enabled = fUseTemplateButton.getSelection();

        if (enabled) {
            setSelectedTemplate(fLastSelectedTemplateName);
        } else {
            // save last selected template
            Template template = getSelectedTemplate();
            if (template != null)
                fLastSelectedTemplateName = template.getName();
            else
                fLastSelectedTemplateName = ""; //$NON-NLS-1$

            fTableViewer.setSelection(null);
        }

        fTableViewer.getControl().setEnabled(enabled);
        fPatternViewer.getControl().setEnabled(enabled);
    }

    private Template getSelectedTemplate() {
        Template template = null;
        IStructuredSelection selection = (IStructuredSelection) fTableViewer.getSelection();

        if (selection.size() == 1) {
            template = (Template) selection.getFirstElement();
        }
        return template;
    }

    String getTemplateString(int[] offset) {
        String templateString = null;
        offset[0] = 0;

        Template template = getSelectedTemplate();
        if (template != null) {
            TemplateContextType contextType = XSLUIPlugin.getDefault().getTemplateContextRegistry()
                    .getContextType(XSLUIConstants.TEMPLATE_CONTEXT_XSL_NEW);
            IDocument document = new Document();
            TemplateContext context = new DocumentTemplateContext(contextType, document, 0, 0);
            try {
                TemplateBuffer buffer = context.evaluate(template);
                templateString = buffer.getString();
                for (TemplateVariable t : buffer.getVariables()) {
                    if (t.getName().equals(org.eclipse.jface.text.templates.GlobalTemplateVariables.Cursor.NAME)) {
                        if (t.getOffsets().length > 0)
                            offset[0] = t.getOffsets()[0];
                    }
                }
            } catch (Exception e) {
                XSLUIPlugin.log(e);
            }
        }

        return templateString;
    }

    void linkClicked() {
        String pageId = XSL_UI_TEMPLATE_PREFERENCE_PAGE;
        PreferenceDialog dialog = PreferencesUtil.createPreferenceDialogOn(getShell(), pageId,
                new String[] { pageId }, null);
        dialog.open();
        fTableViewer.refresh();
    }

    private void loadLastSavedPreferences() {
        String templateName = XSLUIPlugin.getDefault().getPreferenceStore()
                .getString(XSLUIConstants.NEW_FILE_TEMPLATE_NAME);
        if (templateName == null || templateName.length() == 0) {
            fLastSelectedTemplateName = ""; //$NON-NLS-1$
            fUseTemplateButton.setSelection(false);
        } else {
            fLastSelectedTemplateName = templateName;
            fUseTemplateButton.setSelection(true);
        }
        enableTemplates();
    }

    void saveLastSavedPreferences() {
        String templateName = ""; //$NON-NLS-1$

        Template template = getSelectedTemplate();
        if (template != null) {
            templateName = template.getName();
        }

        XSLUIPlugin.getDefault().getPreferenceStore().setValue(XSLUIConstants.NEW_FILE_TEMPLATE_NAME, templateName);
        XSLUIPlugin.getDefault().savePluginPreferences();
    }

    private void setSelectedTemplate(String templateName) {
        Object template = null;

        if (templateName != null && templateName.length() > 0) {
            // pick the last used template
            template = fTemplateStore.findTemplate(templateName, XSLUIConstants.TEMPLATE_CONTEXT_XSL_NEW);
        }

        // no record of last used template so just pick first element
        if (template == null) {
            // just pick first element
            template = fTableViewer.getElementAt(0);
        }

        if (template != null) {
            IStructuredSelection selection = new StructuredSelection(template);
            fTableViewer.setSelection(selection, true);
        }
    }

    void updateViewerInput() {
        Template template = getSelectedTemplate();
        if (template != null) {
            fPatternViewer.getDocument().set(template.getPattern());
        } else {
            fPatternViewer.getDocument().set(""); //$NON-NLS-1$
        }
    }

}