--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/text/MarginPainter.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,180 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2008 IBM Corporation and others.
+ * 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:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.jface.text.MarginPainter;
+
+import dwt.dwthelper.utils;
+
+
+import dwt.DWT;
+import dwt.custom.StyledText;
+import dwt.events.PaintEvent;
+import dwt.events.PaintListener;
+import dwt.graphics.Color;
+import dwt.graphics.GC;
+import dwt.graphics.Rectangle;
+
+
+/**
+ * Paints a vertical line (margin line) after a given column respecting the text
+ * viewer's font.
+ * <p>
+ * Clients usually instantiate and configure objects of this class.</p>
+ * <p>
+ * This class is not intended to be subclassed.</p>
+ *
+ * @since 2.1
+ * @noextend This class is not intended to be subclassed by clients.
+ */
+public class MarginPainter : IPainter, PaintListener {
+
+    /** The widget of the text viewer */
+    private StyledText fTextWidget;
+
+    /** The column after which to paint the line, default value <code>80</code> */
+    private int fMarginWidth= 80;
+    /** The color in which to paint the line */
+    private Color fColor;
+    /** The line style of the line to be painted, default value <code>DWT.LINE_SOLID</code> */
+    private int fLineStyle= DWT.LINE_SOLID;
+    /** The line width of the line to be painted, default value <code>1</code> */
+    private int fLineWidth= 0; // NOTE: 0 means width is 1 but with optimized performance
+    /** The cached x-offset of the <code>fMarginWidth</code> for the current font */
+    private int fCachedWidgetX= -1;
+    /** The active state of this painter */
+    private bool fIsActive= false;
+
+    /**
+     * Creates a new painter for the given text viewer.
+     *
+     * @param textViewer the text viewer
+     */
+    public MarginPainter(ITextViewer textViewer) {
+        fTextWidget= textViewer.getTextWidget();
+    }
+
+    /**
+     * Sets the column after which to draw the margin line.
+     *
+     * @param width the column
+     */
+    public void setMarginRulerColumn(int width) {
+        fMarginWidth= width;
+        initialize();
+    }
+
+    /**
+     * Sets the line style of the margin line.
+     *
+     * @param lineStyle a <code>DWT</code> style constant describing the line style
+     */
+    public void setMarginRulerStyle(int lineStyle) {
+        fLineStyle= lineStyle;
+    }
+
+    /**
+     * Sets the line width of the margin line.
+     *
+     * @param lineWidth the line width
+     */
+    public void setMarginRulerWidth(int lineWidth) {
+        if (lineWidth is 1)
+            lineWidth= 0; // NOTE: 0 means width is 1 but with optimized performance
+        fLineWidth= lineWidth;
+    }
+
+    /**
+     * Sets the color of the margin line. Must be called before <code>paint</code> is called the first time.
+     *
+     * @param color the color
+     */
+    public void setMarginRulerColor(Color color) {
+        fColor= color;
+    }
+
+    /**
+     * Initializes this painter, by flushing and recomputing all caches and causing
+     * the widget to be redrawn. Must be called explicitly when font of text widget changes.
+     */
+    public void initialize() {
+        computeWidgetX();
+        fTextWidget.redraw();
+    }
+
+    /**
+     * Computes and remembers the x-offset of the margin column for the
+     * current widget font.
+     */
+    private void computeWidgetX() {
+        GC gc= new GC(fTextWidget);
+        int pixels= gc.getFontMetrics().getAverageCharWidth();
+        gc.dispose();
+
+        fCachedWidgetX= pixels * fMarginWidth;
+    }
+
+    /*
+     * @see IPainter#deactivate(bool)
+     */
+    public void deactivate(bool redraw) {
+        if (fIsActive) {
+            fIsActive= false;
+            fCachedWidgetX= -1;
+            fTextWidget.removePaintListener(this);
+            if (redraw)
+                fTextWidget.redraw();
+        }
+    }
+
+    /*
+     * @see IPainter#dispose()
+     */
+    public void dispose() {
+        fTextWidget= null;
+    }
+
+    /*
+     * @see IPainter#paint(int)
+     */
+    public void paint(int reason) {
+        if (!fIsActive) {
+            fIsActive= true;
+            fTextWidget.addPaintListener(this);
+            if (fCachedWidgetX is -1)
+                computeWidgetX();
+            fTextWidget.redraw();
+        } else if (CONFIGURATION is reason || INTERNAL is reason)
+            fTextWidget.redraw();
+    }
+
+    /*
+     * @see dwt.events.PaintListener#paintControl(dwt.events.PaintEvent)
+     */
+    public void paintControl(PaintEvent e) {
+        if (fTextWidget !is null) {
+            int x= fCachedWidgetX - fTextWidget.getHorizontalPixel();
+            if (x >= 0) {
+                Rectangle area= fTextWidget.getClientArea();
+                e.gc.setForeground(fColor);
+                e.gc.setLineStyle(fLineStyle);
+                e.gc.setLineWidth(fLineWidth);
+                e.gc.drawLine(x, 0, x, area.height);
+            }
+        }
+    }
+
+    /*
+     * @see dwtx.jface.text.IPainter#setPositionManager(dwtx.jface.text.IPaintPositionManager)
+     */
+    public void setPositionManager(IPaintPositionManager manager) {
+    }
+}