| 1 | /*
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| 2 | * 01/22/2005
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| 3 | *
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| 4 | * BufferedImageBackgroundPainterStrategy.java - Renders an RTextAreaBase's
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| 5 | * background as an image using a BufferedImage.
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| 6 | *
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| 7 | * This library is distributed under a modified BSD license. See the included
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| 8 | * RSyntaxTextArea.License.txt file for details.
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| 9 | */
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| 10 | package org.fife.ui.rtextarea;
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| 11 |
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| 12 | import java.awt.Graphics;
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| 13 | import java.awt.Image;
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| 14 |
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| 15 |
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| 16 | /**
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| 17 | * A strategy for painting the background of an <code>RTextAreaBase</code>
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| 18 | * as an image. The image is always stretched to completely fill the
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| 19 | * <code>RTextAreaBase</code>.<p>
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| 20 | *
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| 21 | * A <code>java.awt.image.BufferedImage</code> is used for rendering;
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| 22 | * theoretically, for performance you should use
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| 23 | * <code>java.awt.image.VolatileImage</code>; see
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| 24 | * <code>org.fife.ui.RTextArea.VolatileImageBackgroundPainterStrategy</code>
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| 25 | * for this.<p>
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| 26 | *
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| 27 | * You can set the scaling hint used when stretching/skewing the image
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| 28 | * to fit in the <code>RTextAreaBase</code>'s background via the
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| 29 | * <code>setScalingHint</code> method, but keep in mind the more
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| 30 | * accurate the scaling hint, the less responsive your application will
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| 31 | * be when stretching the window (as that's the only time the image's
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| 32 | * size is recalculated).
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| 33 | *
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| 34 | * @author Robert Futrell
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| 35 | * @version 0.1
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| 36 | * @see org.fife.ui.rtextarea.ImageBackgroundPainterStrategy
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| 37 | * @see org.fife.ui.rtextarea.VolatileImageBackgroundPainterStrategy
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| 38 | */
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| 39 | public class BufferedImageBackgroundPainterStrategy
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| 40 | extends ImageBackgroundPainterStrategy {
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| 41 |
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| 42 | private Image bgImage;
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| 43 |
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| 44 |
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| 45 | /**
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| 46 | * Constructor.
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| 47 | *
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| 48 | * @param ta The text area whose background we'll be painting.
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| 49 | */
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| 50 | public BufferedImageBackgroundPainterStrategy(RTextAreaBase ta) {
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| 51 | super(ta);
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| 52 | }
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| 53 |
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| 54 |
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| 55 | /**
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| 56 | * Paints the image at the specified location. This method assumes
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| 57 | * scaling has already been done, and simply paints the background
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| 58 | * image "as-is."
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| 59 | *
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| 60 | * @param g The graphics context.
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| 61 | * @param x The x-coordinate at which to paint.
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| 62 | * @param y The y-coordinate at which to paint.
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| 63 | */
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| 64 | protected void paintImage(Graphics g, int x, int y) {
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| 65 | if (bgImage != null)
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| 66 | g.drawImage(bgImage, x,y, null);
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| 67 | }
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| 68 |
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| 69 |
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| 70 | /**
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| 71 | * Rescales the displayed image to be the specified size.
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| 72 | *
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| 73 | * @param width The new width of the image.
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| 74 | * @param height The new height of the image.
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| 75 | * @param hint The scaling hint to use.
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| 76 | */
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| 77 | protected void rescaleImage(int width, int height, int hint) {
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| 78 | Image master = getMasterImage();
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| 79 | if (master!=null) {
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| 80 | bgImage = master.getScaledInstance(width,height, hint);
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| 81 | tracker.addImage(bgImage, 1);
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| 82 | try {
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| 83 | tracker.waitForID(1);
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| 84 | } catch (InterruptedException e) {
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| 85 | e.printStackTrace();
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| 86 | bgImage = null;
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| 87 | return;
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| 88 | } finally {
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| 89 | tracker.removeImage(bgImage, 1);
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| 90 | }
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| 91 | }
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| 92 | else {
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| 93 | bgImage = null;
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| 94 | }
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| 95 | }
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| 96 |
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| 97 |
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| 98 | } |
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