react app

react-app/node_modules/react/lib/SelectEventPlugin.js

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+/**
+ * Copyright 2013-2015, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule SelectEventPlugin
+ */
+
+'use strict';
+
+var EventConstants = require("./EventConstants");
+var EventPropagators = require("./EventPropagators");
+var ReactInputSelection = require("./ReactInputSelection");
+var SyntheticEvent = require("./SyntheticEvent");
+
+var getActiveElement = require("./getActiveElement");
+var isTextInputElement = require("./isTextInputElement");
+var keyOf = require("./keyOf");
+var shallowEqual = require("./shallowEqual");
+
+var topLevelTypes = EventConstants.topLevelTypes;
+
+var eventTypes = {
+  select: {
+    phasedRegistrationNames: {
+      bubbled: keyOf({onSelect: null}),
+      captured: keyOf({onSelectCapture: null})
+    },
+    dependencies: [
+      topLevelTypes.topBlur,
+      topLevelTypes.topContextMenu,
+      topLevelTypes.topFocus,
+      topLevelTypes.topKeyDown,
+      topLevelTypes.topMouseDown,
+      topLevelTypes.topMouseUp,
+      topLevelTypes.topSelectionChange
+    ]
+  }
+};
+
+var activeElement = null;
+var activeElementID = null;
+var lastSelection = null;
+var mouseDown = false;
+
+/**
+ * Get an object which is a unique representation of the current selection.
+ *
+ * The return value will not be consistent across nodes or browsers, but
+ * two identical selections on the same node will return identical objects.
+ *
+ * @param {DOMElement} node
+ * @param {object}
+ */
+function getSelection(node) {
+  if ('selectionStart' in node &&
+      ReactInputSelection.hasSelectionCapabilities(node)) {
+    return {
+      start: node.selectionStart,
+      end: node.selectionEnd
+    };
+  } else if (window.getSelection) {
+    var selection = window.getSelection();
+    return {
+      anchorNode: selection.anchorNode,
+      anchorOffset: selection.anchorOffset,
+      focusNode: selection.focusNode,
+      focusOffset: selection.focusOffset
+    };
+  } else if (document.selection) {
+    var range = document.selection.createRange();
+    return {
+      parentElement: range.parentElement(),
+      text: range.text,
+      top: range.boundingTop,
+      left: range.boundingLeft
+    };
+  }
+}
+
+/**
+ * Poll selection to see whether it's changed.
+ *
+ * @param {object} nativeEvent
+ * @return {?SyntheticEvent}
+ */
+function constructSelectEvent(nativeEvent) {
+  // Ensure we have the right element, and that the user is not dragging a
+  // selection (this matches native `select` event behavior). In HTML5, select
+  // fires only on input and textarea thus if there's no focused element we
+  // won't dispatch.
+  if (mouseDown ||
+      activeElement == null ||
+      activeElement !== getActiveElement()) {
+    return null;
+  }
+
+  // Only fire when selection has actually changed.
+  var currentSelection = getSelection(activeElement);
+  if (!lastSelection || !shallowEqual(lastSelection, currentSelection)) {
+    lastSelection = currentSelection;
+
+    var syntheticEvent = SyntheticEvent.getPooled(
+      eventTypes.select,
+      activeElementID,
+      nativeEvent
+    );
+
+    syntheticEvent.type = 'select';
+    syntheticEvent.target = activeElement;
+
+    EventPropagators.accumulateTwoPhaseDispatches(syntheticEvent);
+
+    return syntheticEvent;
+  }
+}
+
+/**
+ * This plugin creates an `onSelect` event that normalizes select events
+ * across form elements.
+ *
+ * Supported elements are:
+ * - input (see `isTextInputElement`)
+ * - textarea
+ * - contentEditable
+ *
+ * This differs from native browser implementations in the following ways:
+ * - Fires on contentEditable fields as well as inputs.
+ * - Fires for collapsed selection.
+ * - Fires after user input.
+ */
+var SelectEventPlugin = {
+
+  eventTypes: eventTypes,
+
+  /**
+   * @param {string} topLevelType Record from `EventConstants`.
+   * @param {DOMEventTarget} topLevelTarget The listening component root node.
+   * @param {string} topLevelTargetID ID of `topLevelTarget`.
+   * @param {object} nativeEvent Native browser event.
+   * @return {*} An accumulation of synthetic events.
+   * @see {EventPluginHub.extractEvents}
+   */
+  extractEvents: function(
+      topLevelType,
+      topLevelTarget,
+      topLevelTargetID,
+      nativeEvent) {
+
+    switch (topLevelType) {
+      // Track the input node that has focus.
+      case topLevelTypes.topFocus:
+        if (isTextInputElement(topLevelTarget) ||
+            topLevelTarget.contentEditable === 'true') {
+          activeElement = topLevelTarget;
+          activeElementID = topLevelTargetID;
+          lastSelection = null;
+        }
+        break;
+      case topLevelTypes.topBlur:
+        activeElement = null;
+        activeElementID = null;
+        lastSelection = null;
+        break;
+
+      // Don't fire the event while the user is dragging. This matches the
+      // semantics of the native select event.
+      case topLevelTypes.topMouseDown:
+        mouseDown = true;
+        break;
+      case topLevelTypes.topContextMenu:
+      case topLevelTypes.topMouseUp:
+        mouseDown = false;
+        return constructSelectEvent(nativeEvent);
+
+      // Chrome and IE fire non-standard event when selection is changed (and
+      // sometimes when it hasn't).
+      // Firefox doesn't support selectionchange, so check selection status
+      // after each key entry. The selection changes after keydown and before
+      // keyup, but we check on keydown as well in the case of holding down a
+      // key, when multiple keydown events are fired but only one keyup is.
+      case topLevelTypes.topSelectionChange:
+      case topLevelTypes.topKeyDown:
+      case topLevelTypes.topKeyUp:
+        return constructSelectEvent(nativeEvent);
+    }
+  }
+};
+
+module.exports = SelectEventPlugin;