browser_ensure_frame_is_on_screen.js

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/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */

/* vim: set sts=2 sw=2 et tw=80: */

"use strict";

// Verifies that nsCocoaWindow::EnsureFrameIsOnScreen relocates a top-level

// window onto the main screen when its native frame ends up entirely

// off-screen between hide and show.

add_task(async function ensure_frame_is_on_screen() {

  const win = await BrowserTestUtils.openNewBrowserWindow({});

  // CheckSecurityLeftAndTop is a no-op for system callers, and

  // nsCocoaWindow::Move doesn't constrain, so this moveTo lands the NSWindow

  // frame at coordinates that don't intersect any attached screen.

  win.moveTo(-100000, -100000);

  const baseWindow = win.docShell.treeOwner.QueryInterface(Ci.nsIBaseWindow);

  // Hide and reshow. The reshow goes through nsCocoaWindow::Show, which is

  // where EnsureFrameIsOnScreen runs for top-level windows.

  baseWindow.visibility = false;

  baseWindow.visibility = true;

  await new Promise(resolve =>

    win.requestAnimationFrame(() => win.requestAnimationFrame(resolve))

);

  const screenManager = Cc["@mozilla.org/gfx/screenmanager;1"].getService(

    Ci.nsIScreenManager

);

  const primary = screenManager.primaryScreen;

  const sx = {},

    sy = {},

    sw = {},

    sh = {};

  primary.GetAvailRectDisplayPix(sx, sy, sw, sh);

  const screenLeft = sx.value;

  const screenTop = sy.value;

  const screenRight = screenLeft + sw.value;

  const screenBottom = screenTop + sh.value;

  const winLeft = win.screenX;

  const winTop = win.screenY;

  const winRight = winLeft + win.outerWidth;

  const winBottom = winTop + win.outerHeight;

ok(

    winRight > screenLeft && winLeft < screenRight,

    `Window x range [${winLeft}, ${winRight}] should overlap primary screen ` +

      `x range [${screenLeft}, ${screenRight}]`

);

ok(

    winBottom > screenTop && winTop < screenBottom,

    `Window y range [${winTop}, ${winBottom}] should overlap primary screen ` +

      `y range [${screenTop}, ${screenBottom}]`

);

  await BrowserTestUtils.closeWindow(win);

});