1 files changed, 125 insertions, 0 deletions
diff --git a/comm/calendar/base/content/calendar-modes.js b/comm/calendar/base/content/calendar-modes.js
new file mode 100644
index 0000000000..280a1c7a54
--- /dev/null
+++ b/comm/calendar/base/content/calendar-modes.js
@@ -0,0 +1,125 @@
+/* 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 TodayPane, switchToView, gLastShownCalendarView, ensureUnifinderLoaded */
+
+/* exported calSwitchToCalendarMode, calSwitchToMode, calSwitchToTaskMode,
+ *          changeMode
+ */
+
+var { cal } = ChromeUtils.import("resource:///modules/calendar/calUtils.jsm");
+
+/**
+ * The current mode defining the current mode we're in. Allowed values are:
+ *  - 'mail'
+ *  - 'calendar'
+ *  - 'task'
+ *  - 'chat'
+ *  - 'calendarEvent'
+ *  - 'calendarTask'
+ *  - 'special' - For special tabs like preferences, add-ons manager, about:xyz, etc.
+ *
+ * @global
+ */
+var gCurrentMode = "mail";
+
+/**
+ * Changes the mode (gCurrentMode) and adapts the UI to the new mode.
+ *
+ * @param {string} [mode="mail"] - the new mode: 'mail', 'calendar', 'task', etc.
+ */
+function changeMode(mode = "mail") {
+  gCurrentMode = mode; // eslint-disable-line no-global-assign
+
+  document
+    .querySelectorAll(
+      `menuitem[command="switch2calendar"],menuitem[command="switch2task"],
+       toolbarbutton[command="switch2calendar"],toolbarbutton[command="switch2task"]`
+    )
+    .forEach(elem => {
+      elem.setAttribute("checked", elem.getAttribute("value") == gCurrentMode);
+    });
+
+  document.querySelectorAll("calendar-modebox,calendar-modevbox").forEach(elem => {
+    elem.setAttribute("current", gCurrentMode);
+  });
+
+  TodayPane.onModeModified();
+}
+
+/**
+ * For switching to modes like "mail", "chat", "calendarEvent", "calendarTask", or "special".
+ * (For "calendar" and "task" modes use calSwitchToCalendarMode and calSwitchToTaskMode.)
+ *
+ * @param {string} mode - The mode to switch to.
+ */
+function calSwitchToMode(mode) {
+  if (!["mail", "chat", "calendarEvent", "calendarTask", "special"].includes(mode)) {
+    cal.WARN("Attempted to switch to unknown mode: " + mode);
+    return;
+  }
+  if (gCurrentMode != mode) {
+    const previousMode = gCurrentMode;
+    changeMode(mode);
+
+    if (previousMode == "calendar" || previousMode == "task") {
+      document.commandDispatcher.updateCommands("calendar_commands");
+    }
+    window.setCursor("auto");
+  }
+}
+
+/**
+ * Switches to the calendar mode.
+ */
+function calSwitchToCalendarMode() {
+  if (gCurrentMode != "calendar") {
+    changeMode("calendar");
+
+    // display the calendar panel on the display deck
+    document.getElementById("calendar-view-box").collapsed = false;
+    document.getElementById("calendar-task-box").collapsed = true;
+    document.getElementById("sidePanelNewEvent").hidden = false;
+    document.getElementById("sidePanelNewTask").hidden = true;
+
+    // show the last displayed type of calendar view
+    switchToView(gLastShownCalendarView.get());
+    document.getElementById("calMinimonth").setAttribute("freebusy", "true");
+
+    document.commandDispatcher.updateCommands("calendar_commands");
+    window.setCursor("auto");
+
+    // make sure the view is sized correctly
+    window.dispatchEvent(new CustomEvent("viewresize"));
+
+    // Load the unifinder if it isn't already loaded.
+    ensureUnifinderLoaded();
+  }
+}
+
+/**
+ * Switches to the task mode.
+ */
+function calSwitchToTaskMode() {
+  if (gCurrentMode != "task") {
+    changeMode("task");
+
+    // display the task panel on the display deck
+    document.getElementById("calendar-view-box").collapsed = true;
+    document.getElementById("calendar-task-box").collapsed = false;
+    document.getElementById("sidePanelNewEvent").hidden = true;
+    document.getElementById("sidePanelNewTask").hidden = false;
+
+    document.getElementById("calMinimonth").setAttribute("freebusy", "true");
+
+    let tree = document.getElementById("calendar-task-tree");
+    if (!tree.hasBeenVisible) {
+      tree.hasBeenVisible = true;
+      tree.refresh();
+    }
+
+    document.commandDispatcher.updateCommands("calendar_commands");
+    window.setCursor("auto");
+  }
+}