Add third_party/google-input-tools: Take 2

third_party/google_input_tools/third_party/closure_library/closure/goog/style/bidi.js

Index: third_party/google_input_tools/third_party/closure_library/closure/goog/style/bidi.js
diff --git a/third_party/google_input_tools/third_party/closure_library/closure/goog/style/bidi.js b/third_party/google_input_tools/third_party/closure_library/closure/goog/style/bidi.js
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+// Copyright 2012 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Bidi utility functions.
+ *
+ */
+
+goog.provide('goog.style.bidi');
+
+goog.require('goog.dom');
+goog.require('goog.style');
+goog.require('goog.userAgent');
+
+
+/**
+ * Returns the normalized scrollLeft position for a scrolled element.
+ * @param {Element} element The scrolled element.
+ * @return {number} The number of pixels the element is scrolled. 0 indicates
+ *     that the element is not scrolled at all (which, in general, is the
+ *     left-most position in ltr and the right-most position in rtl).
+ */
+goog.style.bidi.getScrollLeft = function(element) {
+  var isRtl = goog.style.isRightToLeft(element);
+  if (isRtl && goog.userAgent.GECKO) {
+    // ScrollLeft starts at 0 and then goes negative as the element is scrolled
+    // towards the left.
+    return -element.scrollLeft;
+  } else if (isRtl &&
+             !(goog.userAgent.IE && goog.userAgent.isVersionOrHigher('8'))) {
+    // ScrollLeft starts at the maximum positive value and decreases towards
+    // 0 as the element is scrolled towards the left. However, for overflow
+    // visible, there is no scrollLeft and the value always stays correctly at 0
+    var overflowX = goog.style.getComputedOverflowX(element);
+    if (overflowX == 'visible') {
+      return element.scrollLeft;
+    } else {
+      return element.scrollWidth - element.clientWidth - element.scrollLeft;
+    }
+  }
+  // ScrollLeft behavior is identical in rtl and ltr, it starts at 0 and
+  // increases as the element is scrolled away from the start.
+  return element.scrollLeft;
+};
+
+
+/**
+ * Returns the "offsetStart" of an element, analagous to offsetLeft but
+ * normalized for right-to-left environments and various browser
+ * inconsistencies. This value returned can always be passed to setScrollOffset
+ * to scroll to an element's left edge in a left-to-right offsetParent or
+ * right edge in a right-to-left offsetParent.
+ *
+ * For example, here offsetStart is 10px in an LTR environment and 5px in RTL:
+ *
+ * <pre>
+ * |          xxxxxxxxxx     |
+ *  ^^^^^^^^^^   ^^^^   ^^^^^
+ *     10px      elem    5px
+ * </pre>
+ *
+ * If an element is positioned before the start of its offsetParent, the
+ * startOffset may be negative.  This can be used with setScrollOffset to
+ * reliably scroll to an element:
+ *
+ * <pre>
+ * var scrollOffset = goog.style.bidi.getOffsetStart(element);
+ * goog.style.bidi.setScrollOffset(element.offsetParent, scrollOffset);
+ * </pre>
+ *
+ * @see setScrollOffset
+ *
+ * @param {Element} element The element for which we need to determine the
+ *     offsetStart position.
+ * @return {number} The offsetStart for that element.
+ */
+goog.style.bidi.getOffsetStart = function(element) {
+  var offsetLeftForReal = element.offsetLeft;
+
+  // The element might not have an offsetParent.
+  // For example, the node might not be attached to the DOM tree,
+  // and position:fixed children do not have an offset parent.
+  // Just try to do the best we can with what we have.
+  var bestParent = element.offsetParent;
+
+  if (!bestParent && goog.style.getComputedPosition(element) == 'fixed') {
+    bestParent = goog.dom.getOwnerDocument(element).documentElement;
+  }
+
+  // Just give up in this case.
+  if (!bestParent) {
+    return offsetLeftForReal;
+  }
+
+  if (goog.userAgent.GECKO) {
+    // When calculating an element's offsetLeft, Firefox erroneously subtracts
+    // the border width from the actual distance.  So we need to add it back.
+    var borderWidths = goog.style.getBorderBox(bestParent);
+    offsetLeftForReal += borderWidths.left;
+  } else if (goog.userAgent.isDocumentModeOrHigher(8) &&
+             !goog.userAgent.isDocumentModeOrHigher(9)) {
+    // When calculating an element's offsetLeft, IE8/9-Standards Mode
+    // erroneously adds the border width to the actual distance.  So we need to
+    // subtract it.
+    var borderWidths = goog.style.getBorderBox(bestParent);
+    offsetLeftForReal -= borderWidths.left;
+  }
+
+  if (goog.style.isRightToLeft(bestParent)) {
+    // Right edge of the element relative to the left edge of its parent.
+    var elementRightOffset = offsetLeftForReal + element.offsetWidth;
+
+    // Distance from the parent's right edge to the element's right edge.
+    return bestParent.clientWidth - elementRightOffset;
+  }
+
+  return offsetLeftForReal;
+};
+
+
+/**
+ * Sets the element's scrollLeft attribute so it is correctly scrolled by
+ * offsetStart pixels.  This takes into account whether the element is RTL and
+ * the nuances of different browsers.  To scroll to the "beginning" of an
+ * element use getOffsetStart to obtain the element's offsetStart value and then
+ * pass the value to setScrollOffset.
+ * @see getOffsetStart
+ * @param {Element} element The element to set scrollLeft on.
+ * @param {number} offsetStart The number of pixels to scroll the element.
+ *     If this value is < 0, 0 is used.
+ */
+goog.style.bidi.setScrollOffset = function(element, offsetStart) {
+  offsetStart = Math.max(offsetStart, 0);
+  // In LTR and in "mirrored" browser RTL (such as IE), we set scrollLeft to
+  // the number of pixels to scroll.
+  // Otherwise, in RTL, we need to account for different browser behavior.
+  if (!goog.style.isRightToLeft(element)) {
+    element.scrollLeft = offsetStart;
+  } else if (goog.userAgent.GECKO) {
+    // Negative scroll-left positions in RTL.
+    element.scrollLeft = -offsetStart;
+  } else if (!(goog.userAgent.IE && goog.userAgent.isVersionOrHigher('8'))) {
+    // Take the current scrollLeft value and move to the right by the
+    // offsetStart to get to the left edge of the element, and then by
+    // the clientWidth of the element to get to the right edge.
+    element.scrollLeft =
+        element.scrollWidth - offsetStart - element.clientWidth;
+  } else {
+    element.scrollLeft = offsetStart;
+  }
+};
+
+
+/**
+ * Sets the element's left style attribute in LTR or right style attribute in
+ * RTL.  Also clears the left attribute in RTL and the right attribute in LTR.
+ * @param {Element} elem The element to position.
+ * @param {number} left The left position in LTR; will be set as right in RTL.
+ * @param {?number} top The top position.  If null only the left/right is set.
+ * @param {boolean} isRtl Whether we are in RTL mode.
+ */
+goog.style.bidi.setPosition = function(elem, left, top, isRtl) {
+  if (!goog.isNull(top)) {
+    elem.style.top = top + 'px';
+  }
+  if (isRtl) {
+    elem.style.right = left + 'px';
+    elem.style.left = '';
+  } else {
+    elem.style.left = left + 'px';
+    elem.style.right = '';
+  }
+};