org.eclipse.php.formatter.ui.preferences.PhpPreview.java Source code

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Here is the source code for org.eclipse.php.formatter.ui.preferences.PhpPreview.java

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/*******************************************************************************
 * Copyright (c) 2013 Zend Techologies Ltd.
 * 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:
 *     Zend Technologies Ltd. - initial API and implementation
 *******************************************************************************/
package org.eclipse.php.formatter.ui.preferences;

import java.io.CharArrayReader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.preference.PreferenceConverter;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.php.formatter.core.CodeFormatterPreferences;
import org.eclipse.php.internal.core.documentModel.provisional.contenttype.ContentTypeIdForPHP;
import org.eclipse.php.internal.ui.editor.highlighter.LineStyleProviderForPhp;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.internal.editors.text.EditorsPlugin;
import org.eclipse.ui.texteditor.AbstractTextEditor;
import org.eclipse.wst.sse.core.StructuredModelManager;
import org.eclipse.wst.sse.core.internal.ltk.parser.RegionParser;
import org.eclipse.wst.sse.core.internal.provisional.IModelManager;
import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocumentRegion;

public abstract class PhpPreview {
    protected String fInput;
    protected final StyledText fText;
    protected IStructuredDocumentRegion fNodes;
    protected RegionParser fParser;
    protected IPreferenceStore fPreferenceStore;
    protected LineStyleProviderForPhp fStyleProvider = new LineStyleProviderForPhp();

    protected CodeFormatterPreferences codeFormatterPreferences;

    /**
     * Create a new Java preview
     * 
     * @param workingValues
     * @param parent
     */
    public PhpPreview(CodeFormatterPreferences codeFormatterPreferences, Composite parent) {
        // set the PHP parser
        IModelManager mmanager = StructuredModelManager.getModelManager();
        fParser = mmanager.createStructuredDocumentFor(ContentTypeIdForPHP.ContentTypeID_PHP).getParser();

        this.codeFormatterPreferences = codeFormatterPreferences;

        // create the text area
        fText = new StyledText(parent,
                SWT.LEFT_TO_RIGHT | SWT.MULTI | SWT.V_SCROLL | SWT.H_SCROLL | SWT.BORDER | SWT.READ_ONLY);
        GridData data = new GridData(GridData.FILL_BOTH);
        fText.setLayoutData(data);
        fText.setEditable(false);
        fText.setFont(JFaceResources.getTextFont());
    }

    public Control getControl() {
        return fText;
    }

    public void update() {
        final int height = fText.getClientArea().height;
        final int top0 = fText.getTopPixel();

        final int totalPixels0 = getHeightOfAllLines(fText);
        final int topPixelRange0 = totalPixels0 > height ? totalPixels0 - height : 0;

        fText.setRedraw(false);
        doFormatPreview();

        final int totalPixels1 = getHeightOfAllLines(fText);
        final int topPixelRange1 = totalPixels1 > height ? totalPixels1 - height : 0;

        final int top1 = topPixelRange0 > 0 ? (int) (topPixelRange1 * top0 / (double) topPixelRange0) : 0;
        fText.setTopPixel(top1);
        fText.setRedraw(true);
    }

    private int getHeightOfAllLines(StyledText styledText) {
        int height = 0;
        int lineCount = styledText.getLineCount();
        for (int i = 0; i < lineCount; i++) {
            height = height + styledText.getLineHeight(styledText.getOffsetAtLine(i));
        }
        return height;
    }

    protected abstract void doFormatPreview();

    protected void applyStyles() {
        if (fText == null || fText.isDisposed() || fInput == null || fInput.length() == 0) {
            return;
        }

        final IPreferenceStore editorStore = EditorsPlugin.getDefault().getPreferenceStore();
        fText.setBackground(editorStore.getBoolean(AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND_SYSTEM_DEFAULT)
                ? null
                : new Color(fText.getDisplay(),
                        PreferenceConverter.getColor(editorStore, AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND)));

        fStyleProvider.loadColors();

        IStructuredDocumentRegion node = fNodes;
        final Collection<StyleRange> holdResults = new ArrayList<StyleRange>();
        fStyleProvider.prepareTextRegions(node, 0, fInput.length(), holdResults);

        for (Iterator<StyleRange> iter = holdResults.iterator(); iter.hasNext();) {
            StyleRange element = iter.next();
            fText.setStyleRange(element);
        }
    }

    public void setText(String s) {
        fInput = s;
        getParser().reset(new CharArrayReader(fInput.toCharArray()));
        fNodes = getParser().getDocumentRegions();
        if (fText != null) {
            fText.setText(s);
        }
        applyStyles();
    }

    public RegionParser getParser() {
        return fParser;
    }

    public final CodeFormatterPreferences getPreferences() {
        return codeFormatterPreferences;
    }

    public final void setPreferences(CodeFormatterPreferences codeFormatterPreferences) {
        this.codeFormatterPreferences = codeFormatterPreferences;
    }

}