Code viewer with color syntax integrated to the finder preview panel
After installing QLColorCode you just have to hit the spacebar to get a similar experience.

To cycle through your files in list view use the up- or down-arrow. To open a chosen folder hit the right-arrow and continue cycling through your code files. To close a folder hit the left-arrow. The other view options work similar (e.g to open a folder in icon view you have to hit cmd + right-arrow).

Hit the spacebar once more to close the preview window.

For some source code files you might have to disable the Xcode QuickView plugin.
Check the readme file of QLColorCode to modify the theme and other aspects of syntax highlighting.