[25584] | 1 | /*
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| 2 | * 01/22/2005
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| 3 | *
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| 4 | * VolatileImageBackgroundPainterStrategy.java - Renders an RTextAreaBase's
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| 5 | * background as an image using VolatileImages.
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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 | import java.awt.image.VolatileImage;
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| 15 |
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| 16 |
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| 17 | /**
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| 18 | * A strategy for painting the background of an <code>RTextAreaBase</code>
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| 19 | * as an image. The image is always stretched to completely fill the
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| 20 | * <code>RTextAreaBase</code>.<p>
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| 21 | *
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| 22 | * A <code>java.awt.image.VolatileImage</code> is used for rendering;
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| 23 | * theoretically, this should be the best image format for performance.<p>
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| 24 | *
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| 25 | * You can set the scaling hint used when stretching/skewing the image
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| 26 | * to fit in the <code>RTextAreaBase</code>'s background via the
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| 27 | * <code>setScalingHint</code> method, but keep in mind the more
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| 28 | * accurate the scaling hint, the less responsive your application will
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| 29 | * be when stretching the window (as that's the only time the image's
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| 30 | * size is recalculated).
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| 31 | *
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| 32 | * @author Robert Futrell
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| 33 | * @version 0.1
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| 34 | * @see org.fife.ui.rtextarea.ImageBackgroundPainterStrategy
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| 35 | * @see org.fife.ui.rtextarea.BufferedImageBackgroundPainterStrategy
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| 36 | */
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| 37 | public class VolatileImageBackgroundPainterStrategy
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| 38 | extends ImageBackgroundPainterStrategy {
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| 39 |
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| 40 | private VolatileImage bgImage;
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| 41 |
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| 42 |
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| 43 | /**
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| 44 | * Constructor.
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| 45 | *
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| 46 | * @param ta The text area whose background we'll be painting.
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| 47 | */
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| 48 | public VolatileImageBackgroundPainterStrategy(RTextAreaBase ta) {
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| 49 | super(ta);
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| 50 | }
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| 51 |
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| 52 |
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| 53 | /**
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| 54 | * Paints the image at the specified location. This method assumes
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| 55 | * scaling has already been done, and simply paints the background
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| 56 | * image "as-is."
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| 57 | *
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| 58 | * @param g The graphics context.
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| 59 | * @param x The x-coordinate at which to paint.
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| 60 | * @param y The y-coordinate at which to paint.
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| 61 | */
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| 62 | protected void paintImage(Graphics g, int x, int y) {
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| 63 | if (bgImage != null) {
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| 64 | do {
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| 65 | int rc = bgImage.validate(null);//getGraphicsConfiguration());
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| 66 | if (rc==VolatileImage.IMAGE_RESTORED) {
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| 67 | // FIXME: If the image needs to be restored are its width
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| 68 | // and height still valid?? If not, we'll need to cache
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| 69 | // these values...
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| 70 | renderImage(bgImage.getWidth(), bgImage.getHeight(),
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| 71 | getScalingHint());
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| 72 | }
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| 73 | g.drawImage(bgImage, x,y, null);
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| 74 | } while (bgImage.contentsLost());
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| 75 | }
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| 76 | }
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| 77 |
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| 78 |
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| 79 | /**
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| 80 | * Renders the image at the proper size into <code>bgImage</code>.
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| 81 | * This method assumes that <code>bgImage</code> is not
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| 82 | * <code>null</code>.
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| 83 | *
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| 84 | * @param width The width of the volatile image to render into.
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| 85 | * @param height The height of the volatile image to render into.
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| 86 | * @param hint The scaling hint to use.
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| 87 | */
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| 88 | protected void renderImage(int width, int height, int hint) {
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| 89 | Image master = getMasterImage();
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| 90 | if (master!=null) {
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| 91 | do {
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| 92 | Image i = master.getScaledInstance(width,height, hint);
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| 93 | tracker.addImage(i, 1);
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| 94 | try {
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| 95 | tracker.waitForID(1);
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| 96 | } catch (InterruptedException e) {
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| 97 | e.printStackTrace();
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| 98 | bgImage = null;
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| 99 | return;
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| 100 | } finally {
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| 101 | tracker.removeImage(i, 1);
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| 102 | }
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| 103 | bgImage.getGraphics().drawImage(i, 0,0, null);
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| 104 | tracker.addImage(bgImage, 0);
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| 105 | try {
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| 106 | tracker.waitForID(0);
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| 107 | } catch (InterruptedException e) {
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| 108 | e.printStackTrace();
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| 109 | bgImage = null;
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| 110 | return;
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| 111 | } finally {
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| 112 | tracker.removeImage(bgImage, 0);
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| 113 | }
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| 114 | } while (bgImage.contentsLost());
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| 115 | } // End of if (master!=null).
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| 116 | else {
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| 117 | bgImage = null;
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| 118 | }
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| 119 | }
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| 120 |
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| 121 |
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| 122 | /**
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| 123 | * Rescales the displayed image to be the specified size.
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| 124 | *
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| 125 | * @param width The new width of the image.
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| 126 | * @param height The new height of the image.
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| 127 | * @param hint The scaling hint to use.
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| 128 | */
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| 129 | protected void rescaleImage(int width, int height, int hint) {
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| 130 | bgImage = getRTextAreaBase().createVolatileImage(width, height);
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| 131 | if (bgImage!=null)
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| 132 | renderImage(width, height, hint);
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| 133 | }
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| 134 |
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| 135 |
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| 136 | } |
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