From 1884c7070eec3f994da1ddb36e7ce644771c8cb6 Mon Sep 17 00:00:00 2001
From: Bryan Housel <bryan@mapbox.com>
Date: Mon, 19 Dec 2016 16:55:11 -0500
Subject: [PATCH] Add a keybinding behavior for operations

---
 modules/behavior/index.js     |  1 +
 modules/behavior/operation.js | 40 +++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 modules/behavior/operation.js

diff --git a/modules/behavior/index.js b/modules/behavior/index.js
index da78fa23a..2dfb951bf 100644
--- a/modules/behavior/index.js
+++ b/modules/behavior/index.js
@@ -8,6 +8,7 @@ export { behaviorEdit } from './edit';
 export { behaviorHash } from './hash';
 export { behaviorHover } from './hover';
 export { behaviorLasso } from './lasso';
+export { behaviorOperation } from './operation';
 export { behaviorPaste } from './paste';
 export { behaviorSelect } from './select';
 export { behaviorTail } from './tail';
diff --git a/modules/behavior/operation.js b/modules/behavior/operation.js
new file mode 100644
index 000000000..fa57ddc41
--- /dev/null
+++ b/modules/behavior/operation.js
@@ -0,0 +1,40 @@
+import * as d3 from 'd3';
+import { d3keybinding } from '../lib/d3.keybinding.js';
+
+
+/* Creates a keybinding behavior for an operation */
+export function behaviorOperation(context) {
+    var which, keybinding;
+
+
+    var behavior = function () {
+        if (which) {
+            keybinding = d3keybinding('behavior.key.' + which.id);
+            keybinding.on(which.keys, function() {
+                d3.event.preventDefault();
+                if (!(context.inIntro() || which.disabled())) {
+                    which();
+                }
+            });
+            d3.select(document).call(keybinding);
+        }
+        return behavior;
+    };
+
+
+    behavior.off = function() {
+        if (keybinding) {
+            d3.select(document).call(keybinding.off);
+        }
+    };
+
+
+    behavior.which = function (_) {
+        if (!arguments.length) return which;
+        which = _;
+        return behavior;
+    };
+
+
+    return behavior;
+}