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<h1><a href="../Features/index.html">Features</a> <svg class="Page__header--separator" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 477.175 477.175"><path d="M360.73 229.075l-225.1-225.1c-5.3-5.3-13.8-5.3-19.1 0s-5.3 13.8 0 19.1l215.5 215.5-215.5 215.5c-5.3 5.3-5.3 13.8 0 19.1 2.6 2.6 6.1 4 9.5 4 3.4 0 6.9-1.3 9.5-4l225.1-225.1c5.3-5.2 5.3-13.8.1-19z"/></svg> <a href="../Features/Leader_Key.html">Leader Key</a></h1>
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<li>
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<p><a href="#page_The-Leader-Key-A-New-Kind-of-Modifier">The Leader Key: A New Kind of Modifier</a></p>
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</li>
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</ul>
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<h1 id="page_The-Leader-Key-A-New-Kind-of-Modifier">The Leader Key: A New Kind of Modifier</h1>
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<p>If you've ever used Vim, you know what a Leader key is. If not, you're about to discover a wonderful concept. :) Instead of hitting Alt+Shift+W for example (holding down three keys at the same time), what if you could hit a <em>sequence</em> of keys instead? So you'd hit our special modifier (the Leader key), followed by W and then C (just a rapid succession of keys), and something would happen.</p>
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<p>That's what <code>KC_LEAD</code> does. Here's an example:</p>
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<ol>
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<li>Pick a key on your keyboard you want to use as the Leader key. Assign it the keycode <code>KC_LEAD</code>. This key would be dedicated just for this -- it's a single action key, can't be used for anything else.</li>
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<li>Include the line <code>#define LEADER_TIMEOUT 300</code> somewhere in your keymap.c file, probably near the top. The 300 there is 300ms -- that's how long you have for the sequence of keys following the leader. You can tweak this value for comfort, of course.</li>
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<li>Within your <code>matrix_scan_user</code> function, do something like this:</li>
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</ol>
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<pre><code>LEADER_EXTERNS();
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void matrix_scan_user(void) {
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LEADER_DICTIONARY() {
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leading = false;
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leader_end();
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SEQ_ONE_KEY(KC_F) {
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register_code(KC_S);
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unregister_code(KC_S);
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}
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SEQ_TWO_KEYS(KC_A, KC_S) {
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register_code(KC_H);
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unregister_code(KC_H);
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}
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SEQ_THREE_KEYS(KC_A, KC_S, KC_D) {
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register_code(KC_LGUI);
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register_code(KC_S);
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unregister_code(KC_S);
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unregister_code(KC_LGUI);
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}
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}
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}
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</code></pre>
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<p>As you can see, you have three function. you can use - <code>SEQ_ONE_KEY</code> for single-key sequences (Leader followed by just one key), and <code>SEQ_TWO_KEYS</code> and <code>SEQ_THREE_KEYS</code> for longer sequences. Each of these accepts one or more keycodes as arguments. This is an important point: You can use keycodes from <strong>any layer on your keyboard</strong>. That layer would need to be active for the leader macro to fire, obviously.</p>
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