X-Git-Url: http://secure.phpeclipse.com

diff --git a/archive/net.sourceforge.phpeclipse.css.ui/src/net/sourceforge/phpeclipse/css/ui/internal/preferences/SyntaxPreviewer.java b/archive/net.sourceforge.phpeclipse.css.ui/src/net/sourceforge/phpeclipse/css/ui/internal/preferences/SyntaxPreviewer.java
new file mode 100644
index 0000000..f2e8a47
--- /dev/null
+++ b/archive/net.sourceforge.phpeclipse.css.ui/src/net/sourceforge/phpeclipse/css/ui/internal/preferences/SyntaxPreviewer.java
@@ -0,0 +1,227 @@
+/*
+ * 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;
+		}
+	}
+
+}