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+/* -*- mode: js; indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+export var LayoutUtils = {
+ /**
+ * For a given DOM element, returns its position in screen coordinates of CSS units
+ * (<https://developer.mozilla.org/en-US/docs/Web/CSS/CSSOM_View/Coordinate_systems#screen>).
+ */
+ getElementBoundingScreenRect(aElement) {
+ let rect = aElement.getBoundingClientRect();
+ let win = aElement.ownerGlobal;
+
+ const { x, y, width, height } = this._rectToClientRect(win, rect);
+ return win.windowUtils.toScreenRectInCSSUnits(x, y, width, height);
+ },
+
+ /**
+ * Similar to getElementBoundingScreenRect using window and rect,
+ * returns screen coordinates in screen units.
+ */
+ rectToScreenRect(win, rect) {
+ const { x, y, width, height } = this._rectToClientRect(win, rect);
+ return win.ownerGlobal.windowUtils.toScreenRect(x, y, width, height);
+ },
+
+ _rectToClientRect(win, rect) {
+ let x = rect.left;
+ let y = rect.top;
+
+ // We need to compensate for ancestor iframes in the same process
+ // that might shift things over.
+ let parentFrame = win.browsingContext?.embedderElement;
+ while (parentFrame) {
+ win = parentFrame.ownerGlobal;
+ let cstyle = win.getComputedStyle(parentFrame);
+
+ let framerect = parentFrame.getBoundingClientRect();
+ x +=
+ framerect.left +
+ parseFloat(cstyle.borderLeftWidth) +
+ parseFloat(cstyle.paddingLeft);
+ y +=
+ framerect.top +
+ parseFloat(cstyle.borderTopWidth) +
+ parseFloat(cstyle.paddingTop);
+
+ parentFrame = win.browsingContext?.embedderElement;
+ }
+
+ return {
+ x,
+ y,
+ width: rect.width,
+ height: rect.height,
+ };
+ },
+};