--- /dev/null
+/*
+ * Copyright (c) 2003-2004 Christopher Lenz and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ * Christopher Lenz - initial API and implementation
+ *
+ * $Id: SyntaxPreviewer.java,v 1.1 2004-09-02 18:11:50 jsurfer Exp $
+ */
+
+package net.sourceforge.phpeclipse.css.ui.internal.preferences;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+import net.sourceforge.phpeclipse.css.ui.CssUI;
+import net.sourceforge.phpeclipse.css.ui.internal.CssUIPreferences;
+import net.sourceforge.phpeclipse.css.ui.internal.text.CssSourceViewerConfiguration;
+import net.sourceforge.phpeclipse.css.ui.text.CssTextTools;
+
+import org.eclipse.jface.preference.IPreferenceStore;
+import org.eclipse.jface.preference.PreferenceConverter;
+import org.eclipse.jface.resource.JFaceResources;
+import org.eclipse.jface.text.Document;
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.source.SourceViewer;
+import org.eclipse.jface.util.IPropertyChangeListener;
+import org.eclipse.jface.util.PropertyChangeEvent;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.custom.StyledText;
+import org.eclipse.swt.graphics.Color;
+import org.eclipse.swt.graphics.RGB;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Display;
+
+/**
+ * A previewer for the syntax styling preferences, used to give real time
+ * feedback on changes to the preferences.
+ */
+public class SyntaxPreviewer extends SourceViewer {
+
+ // Constants ---------------------------------------------------------------
+
+ /**
+ * Alias for the preference constant <code>EDITOR_BACKGROUND_COLOR</code>.
+ */
+ private static final String BACKGROUND_COLOR =
+ CssUIPreferences.EDITOR_BACKGROUND_COLOR;
+
+ /**
+ * Alias for the preference constant
+ * <code>EDITOR_BACKGROUND_DEFAULT_COLOR</code>.
+ */
+ private static final String BACKGROUND_DEFAULT_COLOR =
+ CssUIPreferences.EDITOR_BACKGROUND_DEFAULT_COLOR;
+
+ // Instance Variables ------------------------------------------------------
+
+ /**
+ * The preference store used for loading the style settings.
+ */
+ private IPreferenceStore fStore;
+
+ /**
+ * Listener that handles changes to the preference store.
+ */
+ private IPropertyChangeListener fPropertyChangeListener =
+ new IPropertyChangeListener() {
+ public void propertyChange(PropertyChangeEvent event) {
+ if (affectsPresentation(event)) {
+ updateColors();
+ }
+ invalidateTextPresentation();
+ }
+ };
+
+ private CssTextTools fTextTools;
+
+ /**
+ * The cached background color of the previewer.
+ */
+ private Color fBackgroundColor;
+
+ // Constructors ------------------------------------------------------------
+
+ /**
+ * Constructor.
+ *
+ * @param parent The parent composite
+ * @param store The preference store to use for loading the style settings
+ */
+ public SyntaxPreviewer(Composite parent, IPreferenceStore store) {
+ super(parent, null, SWT.V_SCROLL | SWT.H_SCROLL | SWT.BORDER);
+ this.fStore = store;
+ this.fTextTools = new CssTextTools(this.fStore);
+
+ configure(new CssSourceViewerConfiguration(
+ this.fTextTools, this.fStore));
+ setEditable(false);
+ getTextWidget().setFont(JFaceResources.getTextFont());
+
+ IDocument document = new Document(
+ loadTextFromResource("preview.css")); //$NON-NLS-1$
+ this.fTextTools.setupDocument(document);
+ setDocument(document);
+
+ this.fStore.addPropertyChangeListener(this.fPropertyChangeListener);
+ }
+
+ // SourceViewer Implementation ---------------------------------------------
+
+ /**
+ * @see org.eclipse.jface.text.TextViewer#handleDispose()
+ */
+ protected void handleDispose() {
+ if (this.fStore != null) {
+ if (this.fPropertyChangeListener != null) {
+ this.fStore.removePropertyChangeListener(
+ this.fPropertyChangeListener);
+ this.fPropertyChangeListener = null;
+ }
+ this.fStore = null;
+ }
+ if (this.fTextTools != null) {
+ this.fTextTools.dispose();
+ this.fTextTools = null;
+ }
+ if ((this.fBackgroundColor != null)
+ && !this.fBackgroundColor.isDisposed()) {
+ this.fBackgroundColor.dispose();
+ }
+ super.handleDispose();
+ }
+
+ // Private Methods ---------------------------------------------------------
+
+ private boolean affectsPresentation(PropertyChangeEvent event) {
+ String p = event.getProperty();
+ if (BACKGROUND_COLOR.equals(p)
+ || BACKGROUND_DEFAULT_COLOR.equals(p)) {
+ return true;
+ }
+ return false;
+ }
+
+ /**
+ * Creates a color from the information stored in the given preference
+ * store.
+ *
+ * @param key The preference key under which the color is stored
+ * @param display The display
+ * @return The color found, or <code>null</code> if no corresponding
+ * preference is available
+ */
+ private Color createColor(String key, Display display) {
+ Color color = null;
+ if (this.fStore.contains(key)) {
+ RGB rgb = null;
+ if (this.fStore.isDefault(key)) {
+ rgb = PreferenceConverter.getDefaultColor(this.fStore, key);
+ } else {
+ rgb = PreferenceConverter.getColor(this.fStore, key);
+ }
+ if (rgb != null) {
+ color = new Color(display, rgb);
+ }
+ }
+ return color;
+ }
+
+ /**
+ * Loads and returns the text stored in the specified resource.
+ *
+ * @param name The resource name
+ * @return The text loaded from the resource, or an empty string if there
+ * was an error reading the resource contents
+ */
+ private String loadTextFromResource(String name) {
+ String line;
+ String separator = System.getProperty("line.separator"); //$NON-NLS-1$
+ StringBuffer buffer = new StringBuffer(512);
+ BufferedReader reader = null;
+ try {
+ reader = new BufferedReader(new InputStreamReader(
+ getClass().getResourceAsStream(name)));
+ while ((line = reader.readLine()) != null) {
+ buffer.append(line);
+ buffer.append(separator);
+ }
+ } catch (IOException io) {
+ CssUI.log(io);
+ } finally {
+ if (reader != null) {
+ try {
+ reader.close();
+ } catch (IOException e) {
+ // ignore
+ }
+ }
+ }
+ return buffer.toString();
+ }
+
+ /**
+ * Updates the previewer colors.
+ */
+ private void updateColors() {
+ if (this.fStore != null) {
+ StyledText styledText = getTextWidget();
+ Color color = null;
+ if (!this.fStore.getBoolean(BACKGROUND_DEFAULT_COLOR)) {
+ color = createColor(BACKGROUND_COLOR,
+ styledText.getDisplay());
+ }
+ styledText.setBackground(color);
+ if (this.fBackgroundColor != null) {
+ this.fBackgroundColor.dispose();
+ }
+ this.fBackgroundColor = color;
+ }
+ }
+
+}
git://git.phpeclipse.com / phpeclipse.git / blobdiff