# Vim/Emacs keybinding for Preview.app

Does anybody have ideas about using emacs/ vim key binding for Preview.app to browser pdf files and how?

• What exact keybindings are you looking for? To browse PDF files you can already easily use ⌥↑ or ⌥↓, for example. – slhck Jan 4 '13 at 9:46

You can edit the "Up" and "Down" keyboard shortcuts by going to System Preferences / Keyboard / Application Shortcuts, add a new shortcut for Preview.app. I've mapped Option-J to down, Option-K to up. It won't let you map just J and K, for some reason. But at least you can now browse a PDF without leaving the home row.

• This is a great tip! If only there was a way to get it to scroll smoothly. I always lose track of where I was when going a full page down. – sjy May 22 '14 at 11:37

As @tty suggested, using Karabiner is brilliant. I made some extra rules.

Here is my private.xml:

<?xml version="1.0"?>
<root>
<appdef>
<appname>PREVIEW</appname>
<equal>com.apple.Preview</equal>
</appdef>

<item>
<identifier>private.preview.vinav</identifier>
<only>PREVIEW</only>
<uielementrole_not>AXTextField, AXTextArea</uielementrole_not>
<modifier_only>
ModifierFlag::NONE,
ModifierFlag::SHIFT_L | ModifierFlag::NONE,
ModifierFlag::SHIFT_R | ModifierFlag::NONE,
</modifier_only>
<appendix>Navigate using the HJKL keys</appendix>
<autogen>__KeyToKey__ KeyCode::J, KeyCode::CURSOR_DOWN</autogen>
<autogen>__KeyToKey__ KeyCode::K, KeyCode::CURSOR_UP</autogen>
<autogen>__KeyToKey__ KeyCode::H, KeyCode::CURSOR_LEFT</autogen>
<autogen>__KeyToKey__ KeyCode::L, KeyCode::CURSOR_RIGHT</autogen>
</item>

<item>
<name>Vi Zoom in Preview</name>
<identifier>private.preview.vizoom</identifier>
<only>PREVIEW</only>
<uielementrole_not>AXTextField, AXTextArea</uielementrole_not>
<modifier_only>
ModifierFlag::NONE,
ModifierFlag::SHIFT_L | ModifierFlag::NONE,
ModifierFlag::SHIFT_R | ModifierFlag::NONE,
</modifier_only>
<appendix>Zoom using E/R: out/in</appendix>
<appendix>Zoom to fit: F</appendix>
<appendix>Zoom to 100%: D</appendix>
</item>
</root>

• It had worked perfectly, but a few weeks ago it stopped working. Do you have any idea why? – Mateusz Piotrowski Aug 30 '15 at 21:37
• No, I'm not using this anymore. I assume you installed an updated version of Karabiner? If you find the solution feel free to edit. Or let me know what to change. – Martijn Courteaux Aug 31 '15 at 15:50
• It turns out that this file is case sensitive so the Preview identifier should be com.apple.Preview; not com.apple.preview. – Mateusz Piotrowski Oct 12 '15 at 17:11
• Updating this answer with my latest findings, since there's a newer version of karabiner. After following the installation steps, I went ahead and installed the system wide vimium shortcut keys profile. This gives me vimium like mechanics throughout the system (MIND BLOW!!!). I removed some slippery slope shortcuts; such as x which maps to cmd-q and other shortcuts. But the config file is very simple to modify and is located under ~/.config/karabiner/karabiner.json. – JourneyMan Apr 21 at 21:12

Use this

Very excellent!!!

I found it recently.

https://pqrs.org/macosx/keyremap4macbook/index.html.en

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