JDK-8034233 : Performance problem when editing in a JTextArea with bidirectional characters
- Type: Bug
- Component: client-libs
- Sub-Component: javax.swing
- Affected Version: 7u40
- Priority: P4
- Status: Resolved
- Resolution: Not an Issue
- OS: windows_7
- CPU: x86_64
- Submitted: 2014-02-04
- Updated: 2014-04-02
- Resolved: 2014-02-14
The Version table provides details related to the release that this issue/RFE will be addressed.
Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
| JDK 9 |
|---|
9Resolved  |
Related Reports
|
Relates :
|
Description
FULL PRODUCT VERSION :
1.7.0_40
ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]
A DESCRIPTION OF THE PROBLEM :
If you look at the Java source for:
javax.swing.text.View.forwardUpdate(ElementChange, DocumentEvent, Shape, ViewFactory)
at some point it contains a line like:
index0 = Math.max(index0, 0);
index1 = Math.max((getViewCount() - 1), 0);
for (int i = index0; i <= index1; i++) {
............................................
The extra line:
index1 = Math.max((getViewCount() - 1), 0);
was added in one of the Java 1.7 minor bug fix releases and what it does is that when a character is pressed, the event to layout gets forwarded to all line views, inducing a very large performance problem when the document has bidirectional characters in it.
REGRESSION. Last worked in version 7u10
ADDITIONAL REGRESSION INFORMATION:
1.7.0_40
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a JTextArea with about 500 lines containing bidirectional characters. Edit in it.
REPRODUCIBILITY :
This bug can be reproduced always.
CUSTOMER SUBMITTED WORKAROUND :
None but to overwrite problem method in custom view.
Comments
|