Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1027 insertions, 0 deletions

diff --git a/browser/extensions/screenshots/selector/uicontrol.js b/browser/extensions/screenshots/selector/uicontrol.js
new file mode 100644
index 0000000000..885abe6719
--- /dev/null
+++ b/browser/extensions/screenshots/selector/uicontrol.js
@@ -0,0 +1,1027 @@
+/* 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/. */
+
+/* globals log, catcher, util, ui, slides, global */
+/* globals shooter, callBackground, selectorLoader, assertIsTrusted, selection */
+
+"use strict";
+
+this.uicontrol = (function() {
+  const exports = {};
+
+  /** ********************************************************
+   * selection
+   */
+
+  /* States:
+
+  "crosshairs":
+    Nothing has happened, and the crosshairs will follow the movement of the mouse
+  "draggingReady":
+    The user has pressed the mouse button, but hasn't moved enough to create a selection
+  "dragging":
+    The user has pressed down a mouse button, and is dragging out an area far enough to show a selection
+  "selected":
+    The user has selected an area
+  "resizing":
+    The user is resizing the selection
+  "cancelled":
+    Everything has been cancelled
+  "previewing":
+    The user is previewing the full-screen/visible image
+
+  A mousedown goes from crosshairs to dragging.
+  A mouseup goes from dragging to selected
+  A click outside of the selection goes from selected to crosshairs
+  A click on one of the draggers goes from selected to resizing
+
+  State variables:
+
+  state (string, one of the above)
+  mousedownPos (object with x/y during draggingReady, shows where the selection started)
+  selectedPos (object with x/y/h/w during selected or dragging, gives the entire selection)
+  resizeDirection (string: top, topLeft, etc, during resizing)
+  resizeStartPos (x/y position where resizing started)
+  mouseupNoAutoselect (true if a mouseup in draggingReady should not trigger autoselect)
+
+  */
+
+  const { watchFunction, watchPromise } = catcher;
+
+  const MAX_PAGE_HEIGHT = 10000;
+  const MAX_PAGE_WIDTH = 10000;
+  // An autoselection smaller than these will be ignored entirely:
+  const MIN_DETECT_ABSOLUTE_HEIGHT = 10;
+  const MIN_DETECT_ABSOLUTE_WIDTH = 30;
+  // An autoselection smaller than these will not be preferred:
+  const MIN_DETECT_HEIGHT = 30;
+  const MIN_DETECT_WIDTH = 100;
+  // An autoselection bigger than either of these will be ignored:
+  const MAX_DETECT_HEIGHT = Math.max(window.innerHeight + 100, 700);
+  const MAX_DETECT_WIDTH = Math.max(window.innerWidth + 100, 1000);
+  // This is how close (in pixels) you can get to the edge of the window and then
+  // it will scroll:
+  const SCROLL_BY_EDGE = 20;
+  // This is how wide the inboard scrollbars are, generally 0 except on Mac
+  const SCROLLBAR_WIDTH = window.navigator.platform.match(/Mac/i) ? 17 : 0;
+
+  const { Selection } = selection;
+  const { sendEvent } = shooter;
+  const log = global.log;
+
+  function round10(n) {
+    return Math.floor(n / 10) * 10;
+  }
+
+  function eventOptionsForBox(box) {
+    return {
+      cd1: round10(Math.abs(box.bottom - box.top)),
+      cd2: round10(Math.abs(box.right - box.left)),
+    };
+  }
+
+  function eventOptionsForResize(boxStart, boxEnd) {
+    return {
+      cd1: round10(
+        boxEnd.bottom - boxEnd.top - (boxStart.bottom - boxStart.top)
+      ),
+      cd2: round10(
+        boxEnd.right - boxEnd.left - (boxStart.right - boxStart.left)
+      ),
+    };
+  }
+
+  function eventOptionsForMove(posStart, posEnd) {
+    return {
+      cd1: round10(posEnd.y - posStart.y),
+      cd2: round10(posEnd.x - posStart.x),
+    };
+  }
+
+  function downloadShot() {
+    const previewDataUrl = captureType === "fullPageTruncated" ? null : dataUrl;
+    // Downloaded shots don't have dimension limits
+    removeDimensionLimitsOnFullPageShot();
+    shooter.downloadShot(selectedPos, previewDataUrl, captureType);
+  }
+
+  function copyShot() {
+    const previewDataUrl = captureType === "fullPageTruncated" ? null : dataUrl;
+    // Copied shots don't have dimension limits
+    removeDimensionLimitsOnFullPageShot();
+    shooter.copyShot(selectedPos, previewDataUrl, captureType);
+  }
+
+  /** *********************************************
+   * State and stateHandlers infrastructure
+   */
+
+  // This enumerates all the anchors on the selection, and what part of the
+  // selection they move:
+  const movements = {
+    topLeft: ["x1", "y1"],
+    top: [null, "y1"],
+    topRight: ["x2", "y1"],
+    left: ["x1", null],
+    right: ["x2", null],
+    bottomLeft: ["x1", "y2"],
+    bottom: [null, "y2"],
+    bottomRight: ["x2", "y2"],
+    move: ["*", "*"],
+  };
+
+  const doNotAutoselectTags = {
+    H1: true,
+    H2: true,
+    H3: true,
+    H4: true,
+    H5: true,
+    H6: true,
+  };
+
+  let captureType;
+
+  function removeDimensionLimitsOnFullPageShot() {
+    if (captureType === "fullPageTruncated") {
+      captureType = "fullPage";
+      selectedPos = new Selection(
+        0,
+        0,
+        getDocumentWidth(),
+        getDocumentHeight()
+      );
+    }
+  }
+
+  const standardDisplayCallbacks = {
+    cancel: () => {
+      sendEvent("cancel-shot", "overlay-cancel-button");
+      exports.deactivate();
+    },
+    download: () => {
+      sendEvent("download-shot", "overlay-download-button");
+      downloadShot();
+    },
+    copy: () => {
+      sendEvent("copy-shot", "overlay-copy-button");
+      copyShot();
+    },
+  };
+
+  const standardOverlayCallbacks = {
+    cancel: () => {
+      sendEvent("cancel-shot", "cancel-preview-button");
+      exports.deactivate();
+    },
+    onClickCancel: e => {
+      sendEvent("cancel-shot", "cancel-selection-button");
+      e.preventDefault();
+      e.stopPropagation();
+      exports.deactivate();
+    },
+    onClickVisible: () => {
+      callBackground("captureTelemetry", "visible");
+      sendEvent("capture-visible", "selection-button");
+      selectedPos = new Selection(
+        window.scrollX,
+        window.scrollY,
+        window.scrollX + document.documentElement.clientWidth,
+        window.scrollY + window.innerHeight
+      );
+      captureType = "visible";
+      setState("previewing");
+    },
+    onClickFullPage: () => {
+      callBackground("captureTelemetry", "full_page");
+      sendEvent("capture-full-page", "selection-button");
+      captureType = "fullPage";
+      const width = getDocumentWidth();
+      if (width > MAX_PAGE_WIDTH) {
+        captureType = "fullPageTruncated";
+      }
+      const height = getDocumentHeight();
+      if (height > MAX_PAGE_HEIGHT) {
+        captureType = "fullPageTruncated";
+      }
+      selectedPos = new Selection(0, 0, width, height);
+      setState("previewing");
+    },
+    onDownloadPreview: () => {
+      sendEvent(
+        `download-${captureType
+          .replace(/([a-z])([A-Z])/g, "$1-$2")
+          .toLowerCase()}`,
+        "download-preview-button"
+      );
+      downloadShot();
+    },
+    onCopyPreview: () => {
+      sendEvent(
+        `copy-${captureType.replace(/([a-z])([A-Z])/g, "$1-$2").toLowerCase()}`,
+        "copy-preview-button"
+      );
+      copyShot();
+    },
+  };
+
+  /** Holds all the objects that handle events for each state: */
+  const stateHandlers = {};
+
+  function getState() {
+    return getState.state;
+  }
+  getState.state = "cancel";
+
+  function setState(s) {
+    if (!stateHandlers[s]) {
+      throw new Error("Unknown state: " + s);
+    }
+    const cur = getState.state;
+    const handler = stateHandlers[cur];
+    if (handler.end) {
+      handler.end();
+    }
+    getState.state = s;
+    if (stateHandlers[s].start) {
+      stateHandlers[s].start();
+    }
+  }
+
+  /** Various values that the states use: */
+  let mousedownPos;
+  let selectedPos;
+  let resizeDirection;
+  let resizeStartPos;
+  let resizeStartSelected;
+  let resizeHasMoved;
+  let mouseupNoAutoselect = false;
+  let autoDetectRect;
+
+  /** Represents a single x/y point, typically for a mouse click that doesn't have a drag: */
+  class Pos {
+    constructor(x, y) {
+      this.x = x;
+      this.y = y;
+    }
+
+    elementFromPoint() {
+      return ui.iframe.getElementFromPoint(
+        this.x - window.pageXOffset,
+        this.y - window.pageYOffset
+      );
+    }
+
+    distanceTo(x, y) {
+      return Math.sqrt(Math.pow(this.x - x, 2) + Math.pow(this.y - y, 2));
+    }
+  }
+
+  /** *********************************************
+   * all stateHandlers
+   */
+
+  let dataUrl;
+
+  stateHandlers.previewing = {
+    start() {
+      shooter.preview(selectedPos, captureType);
+    },
+  };
+
+  stateHandlers.crosshairs = {
+    cachedEl: null,
+
+    start() {
+      selectedPos = mousedownPos = null;
+      this.cachedEl = null;
+      watchPromise(
+        ui.iframe
+          .display(installHandlersOnDocument, standardOverlayCallbacks)
+          .then(() => {
+            ui.iframe.usePreSelection();
+            ui.Box.remove();
+          })
+      );
+    },
+
+    mousemove(event) {
+      ui.PixelDimensions.display(
+        event.pageX,
+        event.pageY,
+        event.pageX,
+        event.pageY
+      );
+      if (
+        event.target.classList &&
+        !event.target.classList.contains("preview-overlay")
+      ) {
+        // User is hovering over a toolbar button or control
+        autoDetectRect = null;
+        if (this.cachedEl) {
+          this.cachedEl = null;
+        }
+        ui.HoverBox.hide();
+        return;
+      }
+      let el;
+      if (
+        event.target.classList &&
+        event.target.classList.contains("preview-overlay")
+      ) {
+        // The hover is on the overlay, so we need to figure out the real element
+        el = ui.iframe.getElementFromPoint(
+          event.pageX + window.scrollX - window.pageXOffset,
+          event.pageY + window.scrollY - window.pageYOffset
+        );
+        const xpos = Math.floor(
+          (10 * (event.pageX - window.innerWidth / 2)) / window.innerWidth
+        );
+        const ypos = Math.floor(
+          (10 * (event.pageY - window.innerHeight / 2)) / window.innerHeight
+        );
+
+        for (let i = 0; i < 2; i++) {
+          const move = `translate(${xpos}px, ${ypos}px)`;
+          event.target.getElementsByClassName("eyeball")[
+            i
+          ].style.transform = move;
+        }
+      } else {
+        // The hover is on the element we care about, so we use that
+        el = event.target;
+      }
+      if (this.cachedEl && this.cachedEl === el) {
+        // Still hovering over the same element
+        return;
+      }
+      this.cachedEl = el;
+      this.setAutodetectBasedOnElement(el);
+    },
+
+    setAutodetectBasedOnElement(el) {
+      let lastRect;
+      let lastNode;
+      let rect;
+      let attemptExtend = false;
+      let node = el;
+      while (node) {
+        rect = Selection.getBoundingClientRect(node);
+        if (!rect) {
+          rect = lastRect;
+          break;
+        }
+        if (rect.width < MIN_DETECT_WIDTH || rect.height < MIN_DETECT_HEIGHT) {
+          // Avoid infinite loop for elements with zero or nearly zero height,
+          // like non-clearfixed float parents with or without borders.
+          break;
+        }
+        if (rect.width > MAX_DETECT_WIDTH || rect.height > MAX_DETECT_HEIGHT) {
+          // Then the last rectangle is better
+          rect = lastRect;
+          attemptExtend = true;
+          break;
+        }
+        if (
+          rect.width >= MIN_DETECT_WIDTH &&
+          rect.height >= MIN_DETECT_HEIGHT
+        ) {
+          if (!doNotAutoselectTags[node.tagName]) {
+            break;
+          }
+        }
+        lastRect = rect;
+        lastNode = node;
+        node = node.parentNode;
+      }
+      if (rect && node) {
+        const evenBetter = this.evenBetterElement(node, rect);
+        if (evenBetter) {
+          node = lastNode = evenBetter;
+          rect = Selection.getBoundingClientRect(evenBetter);
+          attemptExtend = false;
+        }
+      }
+      if (rect && attemptExtend) {
+        let extendNode = lastNode.nextSibling;
+        while (extendNode) {
+          if (extendNode.nodeType === document.ELEMENT_NODE) {
+            break;
+          }
+          extendNode = extendNode.nextSibling;
+          if (!extendNode) {
+            const parent = lastNode.parentNode;
+            for (let i = 0; i < parent.childNodes.length; i++) {
+              if (parent.childNodes[i] === lastNode) {
+                extendNode = parent.childNodes[i + 1];
+              }
+            }
+          }
+        }
+        if (extendNode) {
+          const extendSelection = Selection.getBoundingClientRect(extendNode);
+          const extendRect = rect.union(extendSelection);
+          if (
+            extendRect.width <= MAX_DETECT_WIDTH &&
+            extendRect.height <= MAX_DETECT_HEIGHT
+          ) {
+            rect = extendRect;
+          }
+        }
+      }
+
+      if (
+        rect &&
+        (rect.width < MIN_DETECT_ABSOLUTE_WIDTH ||
+          rect.height < MIN_DETECT_ABSOLUTE_HEIGHT)
+      ) {
+        rect = null;
+      }
+      if (!rect) {
+        ui.HoverBox.hide();
+      } else {
+        ui.HoverBox.display(rect);
+      }
+      autoDetectRect = rect;
+    },
+
+    /** When we find an element, maybe there's one that's just a little bit better... */
+    evenBetterElement(node, origRect) {
+      let el = node.parentNode;
+      const ELEMENT_NODE = document.ELEMENT_NODE;
+      while (el && el.nodeType === ELEMENT_NODE) {
+        if (!el.getAttribute) {
+          return null;
+        }
+        const role = el.getAttribute("role");
+        if (
+          role === "article" ||
+          (el.className &&
+            typeof el.className === "string" &&
+            el.className.search("tweet ") !== -1)
+        ) {
+          const rect = Selection.getBoundingClientRect(el);
+          if (!rect) {
+            return null;
+          }
+          if (
+            rect.width <= MAX_DETECT_WIDTH &&
+            rect.height <= MAX_DETECT_HEIGHT
+          ) {
+            return el;
+          }
+          return null;
+        }
+        el = el.parentNode;
+      }
+      return null;
+    },
+
+    mousedown(event) {
+      // FIXME: this is happening but we don't know why, we'll track it now
+      // but avoid popping up messages:
+      if (typeof ui === "undefined") {
+        const exc = new Error("Undefined ui in mousedown");
+        exc.unloadTime = unloadTime;
+        exc.nowTime = Date.now();
+        exc.noPopup = true;
+        exc.noReport = true;
+        throw exc;
+      }
+      if (ui.isHeader(event.target)) {
+        return undefined;
+      }
+      // If the pageX is greater than this, then probably it's an attempt to get
+      // to the scrollbar, or an actual scroll, and not an attempt to start the
+      // selection:
+      const maxX = window.innerWidth - SCROLLBAR_WIDTH;
+      if (event.pageX >= maxX) {
+        event.stopPropagation();
+        event.preventDefault();
+        return false;
+      }
+
+      mousedownPos = new Pos(
+        event.pageX + window.scrollX,
+        event.pageY + window.scrollY
+      );
+      setState("draggingReady");
+      event.stopPropagation();
+      event.preventDefault();
+      return false;
+    },
+
+    end() {
+      ui.HoverBox.remove();
+      ui.PixelDimensions.remove();
+    },
+  };
+
+  stateHandlers.draggingReady = {
+    minMove: 40, // px
+    minAutoImageWidth: 40,
+    minAutoImageHeight: 40,
+    maxAutoElementWidth: 800,
+    maxAutoElementHeight: 600,
+
+    start() {
+      ui.iframe.usePreSelection();
+      ui.Box.remove();
+    },
+
+    mousemove(event) {
+      if (mousedownPos.distanceTo(event.pageX, event.pageY) > this.minMove) {
+        selectedPos = new Selection(
+          mousedownPos.x,
+          mousedownPos.y,
+          event.pageX + window.scrollX,
+          event.pageY + window.scrollY
+        );
+        mousedownPos = null;
+        setState("dragging");
+      }
+    },
+
+    mouseup(event) {
+      // If we don't get into "dragging" then we attempt an autoselect
+      if (mouseupNoAutoselect) {
+        sendEvent("cancel-selection", "selection-background-mousedown");
+        setState("crosshairs");
+        return false;
+      }
+      if (autoDetectRect) {
+        selectedPos = autoDetectRect;
+        selectedPos.x1 += window.scrollX;
+        selectedPos.y1 += window.scrollY;
+        selectedPos.x2 += window.scrollX;
+        selectedPos.y2 += window.scrollY;
+        autoDetectRect = null;
+        mousedownPos = null;
+        ui.iframe.useSelection();
+        ui.Box.display(selectedPos, standardDisplayCallbacks);
+        sendEvent(
+          "make-selection",
+          "selection-click",
+          eventOptionsForBox(selectedPos)
+        );
+        setState("selected");
+        sendEvent("autoselect");
+        callBackground("captureTelemetry", "element");
+      } else {
+        sendEvent("no-selection", "no-element-found");
+        setState("crosshairs");
+      }
+      return undefined;
+    },
+
+    click(event) {
+      this.mouseup(event);
+    },
+
+    findGoodEl() {
+      let el = mousedownPos.elementFromPoint();
+      if (!el) {
+        return null;
+      }
+      const isGoodEl = element => {
+        if (element.nodeType !== document.ELEMENT_NODE) {
+          return false;
+        }
+        if (element.tagName === "IMG") {
+          const rect = element.getBoundingClientRect();
+          return (
+            rect.width >= this.minAutoImageWidth &&
+            rect.height >= this.minAutoImageHeight
+          );
+        }
+        const display = window.getComputedStyle(element).display;
+        if (["block", "inline-block", "table"].includes(display)) {
+          return true;
+          // FIXME: not sure if this is useful:
+          // let rect = el.getBoundingClientRect();
+          // return rect.width <= this.maxAutoElementWidth && rect.height <= this.maxAutoElementHeight;
+        }
+        return false;
+      };
+      while (el) {
+        if (isGoodEl(el)) {
+          return el;
+        }
+        el = el.parentNode;
+      }
+      return null;
+    },
+
+    end() {
+      mouseupNoAutoselect = false;
+    },
+  };
+
+  stateHandlers.dragging = {
+    start() {
+      ui.iframe.useSelection();
+      ui.Box.display(selectedPos);
+    },
+
+    mousemove(event) {
+      selectedPos.x2 = util.truncateX(event.pageX);
+      selectedPos.y2 = util.truncateY(event.pageY);
+      scrollIfByEdge(event.pageX, event.pageY);
+      ui.Box.display(selectedPos);
+      ui.PixelDimensions.display(
+        event.pageX,
+        event.pageY,
+        selectedPos.width,
+        selectedPos.height
+      );
+    },
+
+    mouseup(event) {
+      selectedPos.x2 = util.truncateX(event.pageX);
+      selectedPos.y2 = util.truncateY(event.pageY);
+      ui.Box.display(selectedPos, standardDisplayCallbacks);
+      sendEvent(
+        "make-selection",
+        "selection-drag",
+        eventOptionsForBox({
+          top: selectedPos.y1,
+          bottom: selectedPos.y2,
+          left: selectedPos.x1,
+          right: selectedPos.x2,
+        })
+      );
+      setState("selected");
+      callBackground("captureTelemetry", "custom");
+    },
+
+    end() {
+      ui.PixelDimensions.remove();
+    },
+  };
+
+  stateHandlers.selected = {
+    start() {
+      ui.iframe.useSelection();
+    },
+
+    mousedown(event) {
+      const target = event.target;
+      if (target.tagName === "HTML") {
+        // This happens when you click on the scrollbar
+        return undefined;
+      }
+      const direction = ui.Box.draggerDirection(target);
+      if (direction) {
+        sendEvent("start-resize-selection", "handle");
+        stateHandlers.resizing.startResize(event, direction);
+      } else if (ui.Box.isSelection(target)) {
+        sendEvent("start-move-selection", "selection");
+        stateHandlers.resizing.startResize(event, "move");
+      } else if (!ui.Box.isControl(target)) {
+        mousedownPos = new Pos(event.pageX, event.pageY);
+        setState("crosshairs");
+      }
+      event.preventDefault();
+      return false;
+    },
+  };
+
+  stateHandlers.resizing = {
+    start() {
+      ui.iframe.useSelection();
+      selectedPos.sortCoords();
+    },
+
+    startResize(event, direction) {
+      selectedPos.sortCoords();
+      resizeDirection = direction;
+      resizeStartPos = new Pos(event.pageX, event.pageY);
+      resizeStartSelected = selectedPos.clone();
+      resizeHasMoved = false;
+      setState("resizing");
+    },
+
+    mousemove(event) {
+      this._resize(event);
+      if (resizeDirection !== "move") {
+        ui.PixelDimensions.display(
+          event.pageX,
+          event.pageY,
+          selectedPos.width,
+          selectedPos.height
+        );
+      }
+      return false;
+    },
+
+    mouseup(event) {
+      this._resize(event);
+      sendEvent("selection-resized");
+      ui.Box.display(selectedPos, standardDisplayCallbacks);
+      if (resizeHasMoved) {
+        if (resizeDirection === "move") {
+          const startPos = new Pos(
+            resizeStartSelected.left,
+            resizeStartSelected.top
+          );
+          const endPos = new Pos(selectedPos.left, selectedPos.top);
+          sendEvent(
+            "move-selection",
+            "mouseup",
+            eventOptionsForMove(startPos, endPos)
+          );
+        } else {
+          sendEvent(
+            "resize-selection",
+            "mouseup",
+            eventOptionsForResize(resizeStartSelected, selectedPos)
+          );
+        }
+      } else if (resizeDirection === "move") {
+        sendEvent("keep-resize-selection", "mouseup");
+      } else {
+        sendEvent("keep-move-selection", "mouseup");
+      }
+      setState("selected");
+      callBackground("captureTelemetry", "custom");
+    },
+
+    _resize(event) {
+      const diffX = event.pageX - resizeStartPos.x;
+      const diffY = event.pageY - resizeStartPos.y;
+      const movement = movements[resizeDirection];
+      if (movement[0]) {
+        let moveX = movement[0];
+        moveX = moveX === "*" ? ["x1", "x2"] : [moveX];
+        for (const moveDir of moveX) {
+          selectedPos[moveDir] = util.truncateX(
+            resizeStartSelected[moveDir] + diffX
+          );
+        }
+      }
+      if (movement[1]) {
+        let moveY = movement[1];
+        moveY = moveY === "*" ? ["y1", "y2"] : [moveY];
+        for (const moveDir of moveY) {
+          selectedPos[moveDir] = util.truncateY(
+            resizeStartSelected[moveDir] + diffY
+          );
+        }
+      }
+      if (diffX || diffY) {
+        resizeHasMoved = true;
+      }
+      scrollIfByEdge(event.pageX, event.pageY);
+      ui.Box.display(selectedPos);
+    },
+
+    end() {
+      resizeDirection = resizeStartPos = resizeStartSelected = null;
+      selectedPos.sortCoords();
+      ui.PixelDimensions.remove();
+    },
+  };
+
+  stateHandlers.cancel = {
+    start() {
+      ui.iframe.hide();
+      ui.Box.remove();
+    },
+  };
+
+  function getDocumentWidth() {
+    return Math.max(
+      document.body && document.body.clientWidth,
+      document.documentElement.clientWidth,
+      document.body && document.body.scrollWidth,
+      document.documentElement.scrollWidth
+    );
+  }
+  function getDocumentHeight() {
+    return Math.max(
+      document.body && document.body.clientHeight,
+      document.documentElement.clientHeight,
+      document.body && document.body.scrollHeight,
+      document.documentElement.scrollHeight
+    );
+  }
+
+  function scrollIfByEdge(pageX, pageY) {
+    const top = window.scrollY;
+    const bottom = top + window.innerHeight;
+    const left = window.scrollX;
+    const right = left + window.innerWidth;
+    if (pageY + SCROLL_BY_EDGE >= bottom && bottom < getDocumentHeight()) {
+      window.scrollBy(0, SCROLL_BY_EDGE);
+    } else if (pageY - SCROLL_BY_EDGE <= top) {
+      window.scrollBy(0, -SCROLL_BY_EDGE);
+    }
+    if (pageX + SCROLL_BY_EDGE >= right && right < getDocumentWidth()) {
+      window.scrollBy(SCROLL_BY_EDGE, 0);
+    } else if (pageX - SCROLL_BY_EDGE <= left) {
+      window.scrollBy(-SCROLL_BY_EDGE, 0);
+    }
+  }
+
+  /** *********************************************
+   * Selection communication
+   */
+
+  exports.activate = function() {
+    if (!document.body) {
+      callBackground("abortStartShot");
+      const tagName = String(document.documentElement.tagName || "").replace(
+        /[^a-z0-9]/gi,
+        ""
+      );
+      sendEvent("abort-start-shot", `document-is-${tagName}`);
+      selectorLoader.unloadModules();
+      return;
+    }
+    if (isFrameset()) {
+      callBackground("abortStartShot");
+      sendEvent("abort-start-shot", "frame-page");
+      selectorLoader.unloadModules();
+      return;
+    }
+    addHandlers();
+    setState("crosshairs");
+  };
+
+  function isFrameset() {
+    return document.body.tagName === "FRAMESET";
+  }
+
+  exports.deactivate = function() {
+    try {
+      sendEvent("internal", "deactivate");
+      setState("cancel");
+      selectorLoader.unloadModules();
+    } catch (e) {
+      log.error("Error in deactivate", e);
+      // Sometimes this fires so late that the document isn't available
+      // We don't care about the exception, so we swallow it here
+    }
+  };
+
+  let unloadTime = 0;
+
+  exports.unload = function() {
+    // Note that ui.unload() will be called on its own
+    unloadTime = Date.now();
+    removeHandlers();
+  };
+
+  /** *********************************************
+   * Event handlers
+   */
+
+  const primedDocumentHandlers = new Map();
+  let registeredDocumentHandlers = [];
+
+  function addHandlers() {
+    ["mouseup", "mousedown", "mousemove", "click"].forEach(eventName => {
+      const fn = watchFunction(
+        assertIsTrusted(function(event) {
+          if (typeof event.button === "number" && event.button !== 0) {
+            // Not a left click
+            return undefined;
+          }
+          if (
+            event.ctrlKey ||
+            event.shiftKey ||
+            event.altKey ||
+            event.metaKey
+          ) {
+            // Modified click of key
+            return undefined;
+          }
+          const state = getState();
+          const handler = stateHandlers[state];
+          if (handler[event.type]) {
+            return handler[event.type](event);
+          }
+          return undefined;
+        })
+      );
+      primedDocumentHandlers.set(eventName, fn);
+    });
+    primedDocumentHandlers.set(
+      "keyup",
+      watchFunction(assertIsTrusted(keyupHandler))
+    );
+    primedDocumentHandlers.set(
+      "keydown",
+      watchFunction(assertIsTrusted(keydownHandler))
+    );
+    window.document.addEventListener(
+      "visibilitychange",
+      visibilityChangeHandler
+    );
+    window.addEventListener("beforeunload", beforeunloadHandler);
+  }
+
+  let mousedownSetOnDocument = false;
+
+  function installHandlersOnDocument(docObj) {
+    for (const [eventName, handler] of primedDocumentHandlers) {
+      const watchHandler = watchFunction(handler);
+      const useCapture = eventName !== "keyup";
+      docObj.addEventListener(eventName, watchHandler, useCapture);
+      registeredDocumentHandlers.push({
+        name: eventName,
+        doc: docObj,
+        handler: watchHandler,
+        useCapture,
+      });
+    }
+    if (!mousedownSetOnDocument) {
+      const mousedownHandler = primedDocumentHandlers.get("mousedown");
+      document.addEventListener("mousedown", mousedownHandler, true);
+      registeredDocumentHandlers.push({
+        name: "mousedown",
+        doc: document,
+        handler: mousedownHandler,
+        useCapture: true,
+      });
+      mousedownSetOnDocument = true;
+    }
+  }
+
+  function beforeunloadHandler() {
+    sendEvent("cancel-shot", "tab-load");
+    exports.deactivate();
+  }
+
+  function keydownHandler(event) {
+    // In MacOS, the keyup event for 'c' is not fired when performing cmd+c.
+    if (
+      event.code === "KeyC" &&
+      (event.ctrlKey || event.metaKey) &&
+      ["previewing", "selected"].includes(getState.state)
+    ) {
+      catcher.watchPromise(
+        callBackground("getPlatformOs").then(os => {
+          if (
+            (event.ctrlKey && os !== "mac") ||
+            (event.metaKey && os === "mac")
+          ) {
+            sendEvent("copy-shot", "keyboard-copy");
+            copyShot();
+          }
+        })
+      );
+    }
+  }
+
+  function keyupHandler(event) {
+    if (event.shiftKey || event.altKey || event.ctrlKey || event.metaKey) {
+      // unused modifier keys
+      return;
+    }
+    if ((event.key || event.code) === "Escape") {
+      sendEvent("cancel-shot", "keyboard-escape");
+      exports.deactivate();
+    }
+    // Enter to trigger Download by default. But if the user tabbed to
+    // select another button, then we do not want this.
+    if (
+      (event.key || event.code) === "Enter" &&
+      getState.state === "selected" &&
+      ui.iframe.document().activeElement.tagName === "BODY"
+    ) {
+      sendEvent("download-shot", "keyboard-enter");
+      downloadShot();
+    }
+  }
+
+  function visibilityChangeHandler(event) {
+    // The document is the event target
+    if (event.target.hidden) {
+      sendEvent("internal", "document-hidden");
+    }
+  }
+
+  function removeHandlers() {
+    window.removeEventListener("beforeunload", beforeunloadHandler);
+    window.document.removeEventListener(
+      "visibilitychange",
+      visibilityChangeHandler
+    );
+    for (const {
+      name,
+      doc,
+      handler,
+      useCapture,
+    } of registeredDocumentHandlers) {
+      doc.removeEventListener(name, handler, !!useCapture);
+    }
+    registeredDocumentHandlers = [];
+  }
+
+  catcher.watchFunction(exports.activate)();
+
+  return exports;
+})();
+
+null;