Some days ago my Eclipse was working fine and a +/- appeared in every block that could be collapsed (functions, classes, etc.)... but now it does appear, and I don't know how to activate that feature again.
It's Eclipse Helios, running on a Gentoo Linux box.
Preferences -> C++ -> Editor -> Folding ?
Make a right click in the editor window and go to preferences there, then only the editor-relevant section of the preferences dialog will appear. This works for JDT, CDT etc...
You can do Ctrl + Numpad_Divide to enable folding. Also if you right-click on the area where the +/- was supposed to be, you can see there is a folding option.
Try this option: Preferences > Java > Editor > Folding > Enable folding
For Python it is as follows:
- collapse all 1 level: Ctrl+9
- expand all 1 level: Ctrl+0
- collapse current: Ctrl+-
- expand current: Ctrl++
Hope that helps.
To collapse all code blocks Ctrl + Shift+ /
To expand all code blocks Ctrl + Shift+ *
pydev:
To collapse all code blocks : Ctrl + 0
To collapse all code blocks : Ctrl + 9
Is there a way to collapse all code blocks in Eclipse?
by @partizanos and @bummi
In Preferences, you'll find General > Keys. It's for setting your keyboard shortcuts.
What I use it for more often, though, is to find stuff in Eclipse. You should see an input box labelled "type filter text." It's as close as Eclipse comes to a search feature for every Eclipse command.
I assume you are using Java, but look under the settings for your particular language.
Under the Window menu, select Preferences.
Under Java->Editor->Folding. Select "Enable Folding".
If you want folding an all your editors, I found you can enable Folding in
Preferences > Editors > Structured Text Editors
Enable Folding
In CFEclipse: Preferences > CFEclipse > Editor > Code Folding > Initially Collapse column, you can uncheck to see all expanded when opening, or check all boxes to close all when opening a file.
I was using salesforce apex classes with Eclipse Neon 3.3 for Java.
I found an option "define folding region" on right click in the editor, I selected the block of code i wanted to collapse and selected this property for that code. Now I am seeing + and - symbol to expand and collapse that block of code
For windows eclipse using java: Windows -> Preferences -> Java -> Editor -> Folding
Unfortunately this will not allow for collapsing code, however if it turns off you can re-enable it to get rid of long comments and imports.
来源：https://stackoverflow.com/questions/3450880/how-to-collapse-blocks-of-code-in-eclipse