/* 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/. */

/**
 * This file should only contain a minimal set of rules for the XUL elements
 * that may be implicitly created as part of HTML/SVG documents (e.g.
 * scrollbars).  Rules for everything else related to XUL can be found in
 * xul.css.  (This split of the XUL rules is to minimize memory use and improve
 * performance in HTML/SVG documents.)
 *
 * ANYTHING ADDED TO THIS FILE WILL APPLY TO ALL DOCUMENTS, INCLUDING WEB CONTENT.
 * IF UA RULES ARE ONLY NEEDED IN CHROME, THEY SHOULD BE ADDED TO xul.css.
 */

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* set default namespace to XUL */

* {
  -moz-user-focus: ignore;
  user-select: none;
  display: -moz-box;
  box-sizing: border-box;
}

/* hide the content and destroy the frame */
[hidden="true"] {
  display: none;
}

/* hide the content, but don't destroy the frames */
[collapsed="true"] {
  visibility: collapse;
}

/* Rules required for style caching of anonymous content scrollbar parts */
@supports -moz-bool-pref("layout.css.cached-scrollbar-styles.enabled") {
  :is(scrollcorner, resizer, scrollbar, scrollbarbutton, slider):where(:-moz-native-anonymous) {
    /* All scrollbar parts must not inherit any properties from the scrollable
     * element (except for visibility and pointer-events), for the anonymous
     * content style caching system to work.
     */
    all: initial;
    visibility: inherit;
    pointer-events: inherit;

    /* These properties are not included in 'all'. */
    -moz-context-properties: initial;
    -moz-control-character-visibility: initial;
    -moz-font-smoothing-background-color: initial;
    -moz-min-font-size-ratio: initial;

    /* -moz-box-layout: initial; is not included in 'all' but it's not needed,
     * because we explicitly specify it below for the top level scrollbar parts
     * (and it inherits through to the rest).
     */

    math-depth: initial;
    /* As long as inert implies pointer-events: none as it does now, we're
     * good. */
    -moz-inert: initial;

    /* Using initial is not sufficient for direction, since its initial value can
     * depend on the document's language.
     *
     * LTR is what we want for all scrollbar parts anyway, so that e.g. we don't
     * reverse the rendering of a horizontal scrollbar.
     */
    direction: ltr;

    /* Similarly for font properties, whose initial values depend on the
     * document's language.  Scrollbar parts don't have any text or rely on
     * font metrics.
     */
    font: 16px sans-serif;

    /* The initial value of justify-items is `legacy`, which makes it depend on
     * the parent style.
     *
     * Reset it to something else.
     */
    justify-items: start;

    /* Avoid `object > *` rule in html.css from setting a useless, non-initial
     * value of vertical-align.
     */
    vertical-align: initial !important;

    /* Duplicate the rules from the '*' rule above, which were clobbered by the
     * 'all: initial' declaration.
     *
     * The other zero specificity rules above are on :root, and scrollbar parts
     * cannot match :root, so no need to duplicate them.
     */
    -moz-user-focus: ignore;
    user-select: none;
    display: -moz-box;
    box-sizing: border-box;
  }

  /* There are other rules that set the cursor on the scrollbar, expecting them
   * to inherit into its children. Explicitly inherit it, overriding the
   * 'all: initial;' declaration above.
   */
  :is(scrollbarbutton, slider, thumb):where(:-moz-native-anonymous) {
    cursor: inherit;
  }
}

scrollbar,
scrollcorner,
resizer {
  /* Force legacy XUL layout for now on scrollbars / resizers and descendants,
   * as ScrollFrameHelper relies on that (and nsScrollbarFrame is a XUL frame
   * anyways).
   *
   * TODO: Eventually we should rewrite scrollbars so that they don't use XUL
   * layout.
   */
  -moz-box-layout: legacy;
}

scrollbar[orient="vertical"],
slider[orient="vertical"],
thumb[orient="vertical"] {
  -moz-box-orient: vertical;
}

thumb {
  /* Prevent -moz-user-modify declaration from designmode.css having an
   * effect. */
  -moz-user-modify: initial;

  -moz-box-align: center;
  -moz-box-pack: center;
}

/********** resizer **********/

resizer {
  position: relative;
  z-index: 2147483647;
  /* Widget gets decide on its own whether or not the native theme should apply,
     based on the context/OS theme. If it does not, SVG background will kick in. */
  appearance: auto;
  -moz-default-appearance: resizer;

  /* native resizer should never flip on its own;
     we will flip it (or the SVG background) with CSS transform below. */
  direction: ltr;
  writing-mode: initial;

  background: url("chrome://global/skin/icons/resizer.svg") no-repeat;
  background-size: 100% 100%;
  cursor: se-resize;
  width: 15px;
  height: 15px;
}

/* bottomstart/bottomend is supported in XUL window only */
resizer[dir="bottom"][flip],
resizer[dir="bottomleft"],
resizer[dir="bottomstart"]:-moz-locale-dir(ltr),
resizer[dir="bottomend"]:-moz-locale-dir(rtl) {
  transform: scaleX(-1);
}

resizer[dir="bottomleft"],
resizer[dir="bottomstart"]:-moz-locale-dir(ltr),
resizer[dir="bottomend"]:-moz-locale-dir(rtl) {
  cursor: sw-resize;
}

resizer[dir="top"],
resizer[dir="bottom"] {
  cursor: ns-resize;
}

resizer[dir="left"] {
  transform: scaleX(-1);
}

resizer[dir="left"],
resizer[dir="right"] {
  cursor: ew-resize;
}

resizer[dir="topleft"] {
  cursor: nw-resize;
}

resizer[dir="topright"] {
  cursor: ne-resize;
}

/********** scrollbar **********/

thumb {
  -moz-box-flex: 1;
  display: -moz-box !important;
}

/* Don't collapse thumb when scrollbar is disabled. */
thumb[collapsed="true"] {
  visibility: hidden;
}

scrollbar, scrollbarbutton, scrollcorner, slider, thumb {
  user-select: none;
}

scrollbar[value="hidden"] {
  visibility: hidden;
}

@media (-moz-scrollbar-start-backward: 0) {
  scrollbarbutton[sbattr="scrollbar-up-top"] {
    display: none;
  }
}

@media (-moz-scrollbar-start-forward: 0) {
  scrollbarbutton[sbattr="scrollbar-down-top"] {
    display: none;
  }
}

@media (-moz-scrollbar-end-backward: 0) {
  scrollbarbutton[sbattr="scrollbar-up-bottom"] {
    display: none;
  }
}

@media (-moz-scrollbar-end-forward: 0) {
  scrollbarbutton[sbattr="scrollbar-down-bottom"] {
    display: none;
  }
}