The toolbar give you mouse-click access to several of GAPS' sorting and image viewing options.
Previous/Next - Moves through the list of images in the currently opened folder.
Delete - Deletes the current image.
Undo - Reverses the most recent move or delete action.
Jump to Random - Displays a random image from the current folder.
Toggle Shuffle - Switches between an alphabetized or shuffled listing of images in
the current folder. The file list in GAPS' sorting drawer is shuffled or sorted
based on the setting of this button.
Slide Show Delay - Slider to set the length of the pause between images when the slide show is running.
Toggle Slideshow - Starts and stops a slide show of images in the current folder.
Show/hide sorting drawer - Shows or hides the sorting drawer which lists the files in the current folder,
displays duplicate thumbnails, and gives mouse-click access to the sorting actions assigned
to the numeric keypad.
Toggle Zoom - Switches between actual-size and zoom-to-fit mode. Zoom-to-fit will scale the current
image up or down so that it fits in GAPS' current window. Aspect ratio is always maintained, so the image is
not distorted. In actual-size mode, the current image is displayed in the middle of GAPS' window surrounded by
empty space (if the image is smaller than the window), or overflowing allowing you to scroll with your mouse
if the image is larger than GAPS' window.
Toggle Fullscreen - Displays GAPS in full screen mode. Note that some sorting and dupe features currently
don't work in fullscreen. You'll need to press Command-F on your keyboard to leave full screen.