From 5bb1b5ef35118922f8c49a5cfebdbd8d81d1ba92 Mon Sep 17 00:00:00 2001
From: tophf <tophf@gmx.com>
Date: Mon, 23 Nov 2020 12:09:30 +0300
Subject: [PATCH] dedup code for modals in popup

---
 js/dom.js       |  31 +++++++++---
 popup.html      |   8 +--
 popup/popup.css |   5 --
 popup/popup.js  | 130 +++++++++++++++++++++---------------------------
 4 files changed, 84 insertions(+), 90 deletions(-)

diff --git a/js/dom.js b/js/dom.js
index 74649ab4..339a793d 100644
--- a/js/dom.js
+++ b/js/dom.js
@@ -387,9 +387,10 @@ function focusAccessibility() {
 }
 
 /**
- * Switches to the next/previous keyboard-focusable element
+ * Switches to the next/previous keyboard-focusable element.
+ * Doesn't check `visibility` or `display` via getComputedStyle for simplicity.
  * @param {HTMLElement} rootElement
- * @param {Number} step - for exmaple 1 or -1
+ * @param {Number} step - for exmaple 1 or -1 (or 0 to focus the first focusable el in the box)
  * @returns {HTMLElement|false|undefined} -
  *   HTMLElement: focus changed,
  *   false: focus unchanged,
@@ -397,16 +398,15 @@ function focusAccessibility() {
  */
 function moveFocus(rootElement, step) {
   const elements = [...rootElement.getElementsByTagName('*')];
-  const activeIndex = Math.max(0, elements.indexOf(document.activeElement));
+  const activeEl = document.activeElement;
+  const activeIndex = step ? Math.max(step < 0 ? 0 : -1, elements.indexOf(activeEl)) : -1;
   const num = elements.length;
-  const {activeElement} = document;
+  if (!step) step = 1;
   for (let i = 1; i < num; i++) {
-    const elementIndex = (activeIndex + i * step + num) % num;
-    // we don't use positive tabindex so we stop at any valid value
-    const el = elements[elementIndex];
+    const el = elements[(activeIndex + i * step + num) % num];
     if (!el.disabled && el.tabIndex >= 0) {
       el.focus();
-      return activeElement !== el && el;
+      return activeEl !== el && el;
     }
   }
 }
@@ -462,3 +462,18 @@ function setupLivePrefs(
     }
   }
 }
+
+/* exported getEventKeyName */
+/**
+ * @param {KeyboardEvent} e
+ * @param {boolean} [letterAsCode] - use locale-independent KeyA..KeyZ for single-letter chars
+ */
+function getEventKeyName(e, letterAsCode) {
+  const mods =
+    (e.shiftKey ? 'Shift-' : '') +
+    (e.ctrlKey ? 'Ctrl-' : '') +
+    (e.altKey ? 'Alt-' : '') +
+    (e.metaKey ? 'Meta-' : '');
+  return (mods === e.key + '-' ? '' : mods) +
+    (e.key.length === 1 && letterAsCode ? e.code : e.key);
+}
diff --git a/popup.html b/popup.html
index 7c7a10fe..f41f4910 100644
--- a/popup.html
+++ b/popup.html
@@ -25,22 +25,22 @@
           </label>
         </div>
         <div class="actions">
-          <a href="#" class="configure" i18n-title="configureStyle" tabindex="0">
+          <a href="#" class="configure" i18n-title="configureStyle">
             <svg class="svg-icon config"><use xlink:href="#svg-icon-config"></use></svg>
           </a>
-          <a class="style-edit-link" href="edit.html?id=" i18n-title="editStyleLabel" tabindex="0">
+          <a class="style-edit-link" href="edit.html?id=" i18n-title="editStyleLabel">
             <svg class="svg-icon edit" viewBox="0 0 14 16">
               <path fill-rule="evenodd" d="M0 12v3h3l8-8-3-3-8 8zm3 2H1v-2h1v1h1v1zm10.3-9.3L12 6 9 3l1.3-1.3a.996.996 0 0 1 1.41 0l1.59 1.59c.39.39.39 1.02 0 1.41z"/>
             </svg>
           </a>
-          <a href="#" class="menu-button" i18n-title="popupMenuButtonTooltip" tabindex="0">
+          <a href="#" class="menu-button" i18n-title="popupMenuButtonTooltip">
             <svg class="svg-icon menu-button-icon" viewBox="0 0 3 16">
               <path fill-rule="evenodd" d="M0 2.5a1.5 1.5 0 1 0 3 0 1.5 1.5 0 0 0-3 0zm0 5a1.5 1.5 0 1 0 3 0 1.5 1.5 0 0 0-3 0zM1.5 14a1.5 1.5 0 1 1 0-3 1.5 1.5 0 0 1 0 3z"/>
             </svg>
           </a>
         </div>
       </div>
-      <div class="menu" tabindex="-1">
+      <div class="menu">
         <div class="menu-items-wrapper">
           <b class="menu-title"></b>
           <label class="menu-item exclude-by-domain button">
diff --git a/popup/popup.css b/popup/popup.css
index 54160faf..40369b72 100644
--- a/popup/popup.css
+++ b/popup/popup.css
@@ -729,11 +729,6 @@ body.blocked .actions > .main-controls {
   display: flex;
 }
 
-#confirm[data-display=true] + #installed .menu[data-display=true] {
-  opacity: 0;
-  pointer-events: none;
-}
-
 #confirm > div {
   width: 80%;
   max-height: 80%;
diff --git a/popup/popup.js b/popup/popup.js
index adc81cbe..f93d4ecd 100644
--- a/popup/popup.js
+++ b/popup/popup.js
@@ -10,9 +10,11 @@
   configDialog
   FIREFOX
   getActiveTab
+  getEventKeyName
   getStyleDataMerged
   hotkeys
   initializing
+  moveFocus
   msg
   onDOMready
   prefs
@@ -30,6 +32,7 @@ let installed;
 const handleEvent = {};
 
 const ENTRY_ID_PREFIX_RAW = 'style-';
+const MODAL_SHOWN = 'data-display'; // attribute name
 
 $.entry = styleOrId => $(`#${ENTRY_ID_PREFIX_RAW}${styleOrId.id || styleOrId}`);
 
@@ -135,6 +138,19 @@ async function initPopup(frames) {
 
   $('#popup-wiki-button').onclick = handleEvent.openURLandHide;
 
+  $('#confirm').onclick = function (e) {
+    const {id} = this.dataset;
+    switch (e.target.dataset.cmd) {
+      case 'ok':
+        hideModal(this, {animate: true});
+        API.deleteStyle(Number(id));
+        break;
+      case 'cancel':
+        showModal($('.menu', $.entry(id)), '.menu-close');
+        break;
+    }
+  };
+
   if (!prefs.get('popup.stylesFirst')) {
     document.body.insertBefore(
       $('body > .actions'),
@@ -468,88 +484,20 @@ Object.assign(handleEvent, {
   toggleMenu(event) {
     const entry = handleEvent.getClickedStyleElement(event);
     const menu = $('.menu', entry);
-    const menuActive = $('.menu[data-display=true]');
-    if (menuActive) {
-      // fade-out style menu
-      animateElement(menu, 'lights-on')
-        .then(() => (menu.dataset.display = false));
-      window.onkeydown = null;
+    if (menu.hasAttribute(MODAL_SHOWN)) {
+      hideModal(menu, {animate: true});
     } else {
       $('.menu-title', entry).textContent = $('.style-name', entry).textContent;
-      menu.dataset.display = true;
-      menu.style.cssText = '';
-      window.onkeydown = event => {
-        const close = $('.menu-close', entry);
-        const checkbox = $('.exclude-by-domain-checkbox', entry);
-        if (document.activeElement === close && (event.key === 'Tab') && !event.shiftKey) {
-          event.preventDefault();
-          checkbox.focus();
-        }
-        if (document.activeElement === checkbox && (event.key === 'Tab') && event.shiftKey) {
-          event.preventDefault();
-          close.focus();
-        }
-        if (event.key === 'Escape') {
-          event.preventDefault();
-          close.click();
-        }
-      };
+      showModal(menu, '.menu-close');
     }
-    event.preventDefault();
   },
 
   delete(event) {
     const entry = handleEvent.getClickedStyleElement(event);
-    const id = entry.styleId;
     const box = $('#confirm');
-    const menu = $('.menu', entry);
-    const cancel = $('[data-cmd="cancel"]', box);
-    const affirm = $('[data-cmd="ok"]', box);
-    box.dataset.display = true;
-    box.style.cssText = '';
+    box.dataset.id = entry.styleId;
     $('b', box).textContent = $('.style-name', entry).textContent;
-    affirm.focus();
-    affirm.onclick = () => confirm(true);
-    cancel.onclick = () => confirm(false);
-    window.onkeydown = event => {
-      const close = $('.menu-close', entry);
-      const checkbox = $('.exclude-by-domain-checkbox', entry);
-      const confirmActive = $('#confirm[data-display="true"]');
-      const {key} = event;
-      if (document.activeElement === cancel && (key === 'Tab')) {
-        event.preventDefault();
-        affirm.focus();
-      }
-      if (document.activeElement === close && (key === 'Tab') && !event.shiftKey) {
-        event.preventDefault();
-        checkbox.focus();
-      }
-      if (document.activeElement === checkbox && (key === 'Tab') && event.shiftKey) {
-        event.preventDefault();
-        close.focus();
-      }
-      if (key === 'Escape') {
-        event.preventDefault();
-        if (confirmActive) {
-          box.dataset.display = false;
-          menu.focus();
-        } else {
-          close.click();
-        }
-      }
-    };
-    function confirm(ok) {
-      if (ok) {
-        // fade-out deletion confirmation dialog
-        animateElement(box, 'lights-on')
-          .then(() => (box.dataset.display = false));
-        window.onkeydown = null;
-        API.deleteStyle(id);
-      } else {
-        box.dataset.display = false;
-        menu.focus();
-      }
-    }
+    showModal(box, '[data-cmd=cancel]');
   },
 
   configure(event) {
@@ -672,3 +620,39 @@ function blockPopup(isBlocked = true) {
     t.template.noStyles.remove();
   }
 }
+
+function showModal(box, cancelButtonSelector) {
+  const oldBox = $(`[${MODAL_SHOWN}]`);
+  if (oldBox) box.style.animationName = 'none';
+  // '' would be fine but 'true' is backward-compatible with the existing userstyles
+  box.setAttribute(MODAL_SHOWN, 'true');
+  box._onkeydown = e => {
+    const key = getEventKeyName(e);
+    switch (key) {
+      case 'Tab':
+      case 'Shift-Tab':
+        e.preventDefault();
+        moveFocus(box, e.shiftKey ? -1 : 1);
+        break;
+      case 'Escape': {
+        e.preventDefault();
+        window.onkeydown = null;
+        $(cancelButtonSelector, box).click();
+        break;
+      }
+    }
+  };
+  window.on('keydown', box._onkeydown);
+  moveFocus(box, 0);
+  hideModal(oldBox);
+}
+
+async function hideModal(box, {animate} = {}) {
+  window.off('keydown', box._onkeydown);
+  box._onkeydown = null;
+  if (animate) {
+    box.style.animationName = '';
+    await animateElement(box, 'lights-on');
+  }
+  box.removeAttribute(MODAL_SHOWN);
+}