Disable PDF Preview Previous/Next Buttons When Previous/Next Pages Do Not Exist

[klhes]

Description:
The Previous and Next buttons on the PDF Preview window are clickable when previous and next pages do not exist.

Steps to Recreate:

1. Open LaTex Studio.
2. Leave the example welcome.tex file open.
3. Mouse over the Previous button. Notice that the button turns blue.
4. Click the Previous button. Notice that it is clickable, even though a previous page does not exist.
5. Steps 3 and 4 also apply to the Next button.

Expected Result:
When a previous or next page does not exist, the previous or next button should be disabled. It should not change color when on mouse-over, and it should not be clickable.

[Amitbhave]

Hi, I want to work on this issue.
Currently I am facing the following problem while running the project. I am getting following exception:

java.lang.OutOfMemoryError: Java heap space
at java.awt.image.DataBufferInt.(DataBufferInt.java:75)
at sun.awt.image.ImageRepresentation.convertToRGB(ImageRepresentation.java:284)
at sun.awt.image.ImageRepresentation.setPixels(ImageRepresentation.java:591)
at java.awt.image.AreaAveragingScaleFilter.accumPixels(AreaAveragingScaleFilter.java:213)
at java.awt.image.AreaAveragingScaleFilter.setPixels(AreaAveragingScaleFilter.java:278)
at sun.awt.image.OffScreenImageSource.sendPixels(OffScreenImageSource.java:137)
at sun.awt.image.OffScreenImageSource.produce(OffScreenImageSource.java:187)
at sun.awt.image.OffScreenImageSource.addConsumer(OffScreenImageSource.java:66)
at sun.awt.image.OffScreenImageSource.startProduction(OffScreenImageSource.java:80)
at java.awt.image.FilteredImageSource.startProduction(FilteredImageSource.java:183)
at sun.awt.image.ImageRepresentation.startProduction(ImageRepresentation.java:732)
at sun.awt.image.ToolkitImage.addWatcher(ToolkitImage.java:221)
at sun.awt.image.ToolkitImage.getProperty(ToolkitImage.java:169)
at javax.swing.ImageIcon.(ImageIcon.java:240)
at latexstudio.editor.pdf.PDFDisplay.drawPreviewOnJPanel(PDFDisplay.java:43)
at latexstudio.editor.pdf.PDFPreviewRefresher.drawPreview(PDFPreviewRefresher.java:63)
at latexstudio.editor.pdf.PDFPreviewRefresher.run(PDFPreviewRefresher.java:50)
at java.lang.Thread.run(Thread.java:745)

I googled to search for a solution which stated to edit netbeans.conf file but no luck. If anybody has solution to this problem please let me know so that I can start working on this enhancement.

Thanks,
Amit

[Amitbhave]

Issue fixed. Please find the pull request.:)

[Amitbhave]

@sebbrudzinski @klhes can you please verify the fix?