net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpeclipse/phpeditor/PrintMarginPainter.java

   1 package net.sourceforge.phpeclipse.phpeditor;
   2
   3 /*
   4  * (c) Copyright IBM Corp. 2000, 2001.
   5  * All Rights Reserved.
   6  */
   7
   8 import org.eclipse.jface.text.source.ISourceViewer;
   9 import org.eclipse.swt.SWT;
  10 import org.eclipse.swt.custom.StyledText;
  11 import org.eclipse.swt.events.PaintEvent;
  12 import org.eclipse.swt.events.PaintListener;
  13 import org.eclipse.swt.graphics.Color;
  14 import org.eclipse.swt.graphics.GC;
  15 import org.eclipse.swt.graphics.Rectangle;
  16
  17 public class PrintMarginPainter implements IPainter, PaintListener {
  18
  19         private StyledText fTextWidget;
  20
  21         private int fMarginWidth = 80;
  22
  23         private Color fColor;
  24
  25         private int fLineStyle = SWT.LINE_SOLID;
  26
  27         private int fLineWidth = 1;
  28
  29         private int fCachedWidgetX = -1;
  30
  31         private boolean fIsActive = false;
  32
  33         public PrintMarginPainter(ISourceViewer sourceViewer) {
  34                 fTextWidget = sourceViewer.getTextWidget();
  35         }
  36
  37         public void setMarginRulerColumn(int width) {
  38                 fMarginWidth = width;
  39                 intialize();
  40         }
  41
  42         public void setMarginRulerStyle(int lineStyle) {
  43                 fLineStyle = lineStyle;
  44         }
  45
  46         public void setMarginRulerWidth(int lineWidth) {
  47                 fLineWidth = lineWidth;
  48         }
  49
  50         /**
  51          * Must be called before <code>paint</code> is called the first time.
  52          */
  53         public void setMarginRulerColor(Color color) {
  54                 fColor = color;
  55         }
  56
  57         /**
  58          * Must be called explicitly when font of text widget changes.
  59          */
  60         public void intialize() {
  61                 computeWidgetX();
  62                 fTextWidget.redraw();
  63         }
  64
  65         private void computeWidgetX() {
  66                 GC gc = new GC(fTextWidget);
  67                 int pixels = gc.getFontMetrics().getAverageCharWidth();
  68                 gc.dispose();
  69
  70                 fCachedWidgetX = pixels * fMarginWidth;
  71         }
  72
  73         /*
  74          * @see IPainter#deactivate(boolean)
  75          */
  76         public void deactivate(boolean redraw) {
  77                 if (fIsActive) {
  78                         fIsActive = false;
  79                         fTextWidget.removePaintListener(this);
  80                         if (redraw)
  81                                 fTextWidget.redraw();
  82                 }
  83         }
  84
  85         /*
  86          * @see IPainter#dispose()
  87          */
  88         public void dispose() {
  89                 fTextWidget = null;
  90         }
  91
  92         /*
  93          * @see IPainter#paint(int)
  94          */
  95         public void paint(int reason) {
  96                 if (!fIsActive) {
  97                         fIsActive = true;
  98                         fTextWidget.addPaintListener(this);
  99                         if (fCachedWidgetX == -1)
 100                                 computeWidgetX();
 101                         fTextWidget.redraw();
 102                 }
 103         }
 104
 105         /*
 106          * @see IPainter#setPositionManager(IPositionManager)
 107          */
 108         public void setPositionManager(IPositionManager manager) {
 109         }
 110
 111         /*
 112          * @see PaintListener#paintControl(PaintEvent)
 113          */
 114         public void paintControl(PaintEvent e) {
 115                 if (fTextWidget != null) {
 116                         int x = fCachedWidgetX - fTextWidget.getHorizontalPixel();
 117                         if (x >= 0) {
 118                                 Rectangle area = fTextWidget.getClientArea();
 119                                 e.gc.setForeground(fColor);
 120                                 e.gc.setLineStyle(fLineStyle);
 121                                 e.gc.setLineWidth(fLineWidth);
 122                                 e.gc.drawLine(x, 0, x, area.height);
 123                         }
 124                 }
 125         }
 126 }