Initial commit

node_modules/react-draggable/lib/utils/getPrefix.js

@@ -0,0 +1,47 @@
+// @flow
+const prefixes = ['Moz', 'Webkit', 'O', 'ms'];
+export function getPrefix(prop: string='transform'): string {
+  // Checking specifically for 'window.document' is for pseudo-browser server-side
+  // environments that define 'window' as the global context.
+  // E.g. React-rails (see https://github.com/reactjs/react-rails/pull/84)
+  if (typeof window === 'undefined' || typeof window.document === 'undefined') return '';
+
+  const style = window.document.documentElement.style;
+
+  if (prop in style) return '';
+
+  for (let i = 0; i < prefixes.length; i++) {
+    if (browserPrefixToKey(prop, prefixes[i]) in style) return prefixes[i];
+  }
+
+  return '';
+}
+
+export function browserPrefixToKey(prop: string, prefix: string): string {
+  return prefix ? `${prefix}${kebabToTitleCase(prop)}` : prop;
+}
+
+export function browserPrefixToStyle(prop: string, prefix: string): string {
+  return prefix ? `-${prefix.toLowerCase()}-${prop}` : prop;
+}
+
+function kebabToTitleCase(str: string): string {
+  let out = '';
+  let shouldCapitalize = true;
+  for (let i = 0; i < str.length; i++) {
+    if (shouldCapitalize) {
+      out += str[i].toUpperCase();
+      shouldCapitalize = false;
+    } else if (str[i] === '-') {
+      shouldCapitalize = true;
+    } else {
+      out += str[i];
+    }
+  }
+  return out;
+}
+
+// Default export is the prefix itself, like 'Moz', 'Webkit', etc
+// Note that you may have to re-test for certain things; for instance, Chrome 50
+// can handle unprefixed `transform`, but not unprefixed `user-select`
+export default getPrefix();