Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>I was able to reproduce your problem and get you the result your looking for. The problem is that the drawing of the image wasn't complete by the time you were repainting again, so only portions of the image were being painted. To fix this, add this field to your <code>JScrollNavigator</code> class (as a lock):</p> <pre><code>/** Lock to prevent trying to repaint too many times */ private boolean blockRepaint = false; </code></pre> <p>When we repaint the component, this lock will be activated. It won't be released until we have been able to successfully paint the panel - then another paint can be executed.</p> <p>The <code>paintComponent</code> needs to be changed to abide by the lock and use a <code>ImageObserver</code> when painting your navigation panel.</p> <pre><code>@Override protected void paintComponent(final Graphics g) { super.paintComponent(g); if(!blockRepaint){ final Component view = (Component)jScrollPane.getViewport().getView(); BufferedImage img = new BufferedImage(view.getWidth(), view.getHeight(), BufferedImage.TYPE_INT_ARGB); Graphics2D g2d = img.createGraphics(); g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); // Paint JScrollPane view to off-screen image and then scale. // It is this action that causes the display corruption! view.paint(g2d); ImageObserver io = new ImageObserver() { @Override public boolean imageUpdate(Image img, int infoflags, int x, int y,int width, int height) { boolean result = true; g.drawImage(img, 0, 0, null); if((infoflags &amp; ImageObserver.FRAMEBITS) == ImageObserver.FRAMEBITS){ blockRepaint = false; result = false; } return result; } }; Image scaled = img.getScaledInstance(getWidth(), getHeight(), 0); blockRepaint = g.drawImage(scaled, 0, 0, io); } } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. PODrawing a Component to BufferedImage causes display corruption
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USNick Rippe
    1. USNick Rippe
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI tried swapping in your paintComponent to the example I pasted but I see the same result. I don't quite understand how the scaling can be the problem: Even if I comment out the scaling code the problem still occurs; it's the painting to the offscreen image that causes the issue.
      singulars
      1. PO
      1. USAdamski
    2. COI assume you added the lock as a field (otherwise the code wouldn't work). If so, your flag being returned on the `ImageObserver` might be different. The line you indicate is the problem appears to be the problem only because when you comment it out, it prevents the other steps from doing anything - it's the `g.drawImage(...)` line that's taking a while to complete because it's updating the UI. The working code I have is here: http://pastebin.com/MccHaaFj . I added some print statements to the `paintComponent` so you could see exactly which flags are being passed (and adjust as necessary)
      singulars
      1. PO
      1. USNick Rippe
    3. CO@NickRippe: I couldn't make this work on Ubuntu/OpenJDK, but I've never tried to reorder rendering like this. My solution was to avoid `PanelUI` by extending `JComponent`; I'd welcome any critical insight you can offer.
      singulars
      1. PO
      1. UStrashgod
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload