net.sf.eclipsefp.haskell.ui.internal.views.worksheet.EvalExpressionDialog.java Source code

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Here is the source code for net.sf.eclipsefp.haskell.ui.internal.views.worksheet.EvalExpressionDialog.java

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/**
 *  Copyright (c) 2014 by JP Moresmau
 * This code is made available under the terms of the Eclipse Public License,
 * version 1.0 (EPL). See http://www.eclipse.org/legal/epl-v10.html
 */
package net.sf.eclipsefp.haskell.ui.internal.views.worksheet;

import net.sf.eclipsefp.haskell.ui.internal.util.UITexts;
import org.eclipse.jface.dialogs.IInputValidator;
import org.eclipse.jface.dialogs.InputDialog;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
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.swt.widgets.Shell;
import org.eclipse.ui.model.WorkbenchViewerComparator;

/**
 * Input dialog for expressions and their rendering type
 * @author JP Moresmau
 *
 */
public class EvalExpressionDialog extends InputDialog {
    private ResultType resultType = ResultType.TEXT;

    /**
     * @param parentShell
     * @param dialogTitle
     * @param dialogMessage
     * @param initialValue
     */
    public EvalExpressionDialog(final Shell parentShell, final String dialogTitle, final String dialogMessage,
            final EvalExpression initialValue) {
        super(parentShell, dialogTitle, dialogMessage, initialValue.getExpression(), new EvalExpressionValidator());
        this.resultType = initialValue.getResultType();
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.dialogs.InputDialog#createDialogArea(org.eclipse.swt.widgets.Composite)
     */
    @Override
    protected Control createDialogArea(final Composite parent) {
        Composite c = (Composite) super.createDialogArea(parent);

        Composite typeC = new Composite(c, SWT.NONE);
        typeC.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
        typeC.setLayout(new GridLayout(2, false));
        Label typeL = new Label(typeC, SWT.NONE);
        typeL.setText(UITexts.worksheet_expression_type);

        ComboViewer cv = new ComboViewer(typeC, SWT.READ_ONLY | SWT.SINGLE);
        cv.setContentProvider(new ArrayContentProvider());
        cv.setLabelProvider(new LabelProvider());
        cv.setComparator(new WorkbenchViewerComparator());

        cv.setInput(ResultType.values());
        cv.setSelection(new StructuredSelection(resultType));
        cv.addSelectionChangedListener(new ISelectionChangedListener() {

            @Override
            public void selectionChanged(final SelectionChangedEvent event) {
                resultType = (ResultType) ((IStructuredSelection) event.getSelection()).getFirstElement();
            }
        });
        return c;
    }

    /**
     * @return the resultType
     */
    public ResultType getResultType() {
        return resultType;
    }

    private static class EvalExpressionValidator implements IInputValidator {
        /* (non-Javadoc)
         * @see org.eclipse.jface.dialogs.IInputValidator#isValid(java.lang.String)
         */
        @Override
        public String isValid(final String newText) {
            if (newText == null || newText.trim().length() == 0) {
                return UITexts.worksheet_expression_empty;
            }
            return null;
        }
    }
}