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<?xml version="1.0"?>
<!-- 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 files relies on these specific Chrome/XBL globals -->
<!-- globals PopupBoxObject -->

<bindings id="popupBindings"
   xmlns="http://www.mozilla.org/xbl"
   xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
   xmlns:xbl="http://www.mozilla.org/xbl">

  <binding id="popup">
    <content>
      <xul:arrowscrollbox class="popup-internal-box" flex="1" orient="vertical"
                          smoothscroll="false">
        <children/>
      </xul:arrowscrollbox>
    </content>

    <implementation>
      <field name="scrollBox" readonly="true">
        document.getAnonymousElementByAttribute(this, "class", "popup-internal-box");
      </field>

      <field name="AUTOSCROLL_INTERVAL">25</field>
      <field name="NOT_DRAGGING">0</field>
      <field name="DRAG_OVER_BUTTON">-1</field>
      <field name="DRAG_OVER_POPUP">1</field>

      <field name="_draggingState">this.NOT_DRAGGING</field>
      <field name="_scrollTimer">0</field>

      <method name="_enableDragScrolling">
        <!-- when overItem is true, drag started over menuitem; when false, drag
             started while the popup was opening.
          -->
        <parameter name="overItem"/>
        <body>
        <![CDATA[
          if (!this._draggingState) {
            this.setCaptureAlways();
            this._draggingState = overItem ? this.DRAG_OVER_POPUP : this.DRAG_OVER_BUTTON;
          }
        ]]>
        </body>
      </method>

      <method name="_clearScrollTimer">
        <body>
        <![CDATA[
          if (this._scrollTimer) {
            this.ownerGlobal.clearInterval(this._scrollTimer);
            this._scrollTimer = 0;
          }
        ]]>
        </body>
      </method>

      <constructor><![CDATA[
        // Enable the drag-to-scroll events only in menulist popups.
        if (!this.parentNode || this.parentNode.localName != "menulist") {
          return;
        }

        // XBL bindings might be constructed more than once.
        if (this.eventListenersAdded) {
          return;
        }
        this.eventListenersAdded = true;

        this.addEventListener("popupshown", () => {
          // Enable drag scrolling even when the mouse wasn't used. The
          // mousemove handler will remove it if the mouse isn't down.
          this._enableDragScrolling(false);
        });

        this.addEventListener("popuphidden", () => {
          this._draggingState = this.NOT_DRAGGING;
          this._clearScrollTimer();
          this.releaseCapture();
        });

        this.addEventListener("mousedown", event => {
          if (event.button != 0) {
            return;
          }

          if (this.state == "open" &&
            (event.target.localName == "menuitem" ||
              event.target.localName == "menu" ||
              event.target.localName == "menucaption")) {
            this._enableDragScrolling(true);
          }
        });

        this.addEventListener("mouseup", event => {
          if (event.button != 0) {
            return;
          }

          this._draggingState = this.NOT_DRAGGING;
          this._clearScrollTimer();
        });

        this.addEventListener("mousemove", event => {
          if (!this._draggingState) {
            return;
          }

          this._clearScrollTimer();

          // If the user released the mouse before the popup opens, we will
          // still be capturing, so check that the button is still pressed. If
          // not, release the capture and do nothing else. This also handles if
          // the dropdown was opened via the keyboard.
          if (!(event.buttons & 1)) {
            this._draggingState = this.NOT_DRAGGING;
            this.releaseCapture();
            return;
          }

          // If dragging outside the top or bottom edge of the popup, but within
          // the popup area horizontally, scroll the list in that direction. The
          // _draggingState flag is used to ensure that scrolling does not start
          // until the mouse has moved over the popup first, preventing
          // scrolling while over the dropdown button.
          let popupRect = this.getOuterScreenRect();
          if (event.screenX >= popupRect.left &&
              event.screenX <= popupRect.right) {
            if (this._draggingState == this.DRAG_OVER_BUTTON) {
              if (event.screenY > popupRect.top &&
                  event.screenY < popupRect.bottom) {
                this._draggingState = this.DRAG_OVER_POPUP;
              }
            }

            if (this._draggingState == this.DRAG_OVER_POPUP &&
                (event.screenY <= popupRect.top ||
                 event.screenY >= popupRect.bottom)) {
              let scrollAmount = event.screenY <= popupRect.top ? -1 : 1;
              this.scrollBox.scrollByIndex(scrollAmount, true);

              let win = this.ownerGlobal;
              this._scrollTimer = win.setInterval(() => {
                this.scrollBox.scrollByIndex(scrollAmount, true);
              }, this.AUTOSCROLL_INTERVAL);
            }
          }
        });
      ]]></constructor>
    </implementation>

    <handlers>
      <handler event="popupshowing" phase="target">
        <![CDATA[
          var array = [];
          var width = 0;
          for (var menuitem = this.firstElementChild; menuitem; menuitem = menuitem.nextElementSibling) {
            if (menuitem.localName == "menuitem" && menuitem.hasAttribute("acceltext")) {
              var accel = document.getAnonymousElementByAttribute(menuitem, "anonid", "accel");
              if (accel && accel.boxObject) {
                array.push(accel);
                if (accel.boxObject.width > width)
                  width = accel.boxObject.width;
              }
            }
          }
          for (var i = 0; i < array.length; i++)
            array[i].width = width;
        ]]>
      </handler>
    </handlers>
  </binding>

  <binding id="panel">
    <implementation>
      <field name="_prevFocus">0</field>
    </implementation>

    <handlers>
      <handler event="popupshowing"><![CDATA[
        // Capture the previous focus before has a chance to get set inside the panel
        try {
          this._prevFocus = Cu
                            .getWeakReference(document.commandDispatcher.focusedElement);
          if (this._prevFocus.get())
            return;
        } catch (ex) { }

        this._prevFocus = Cu.getWeakReference(document.activeElement);
      ]]></handler>
      <handler event="popupshown"><![CDATA[
        // Fire event for accessibility APIs
        var alertEvent = document.createEvent("Events");
        alertEvent.initEvent("AlertActive", true, true);
        this.dispatchEvent(alertEvent);
       ]]></handler>
      <handler event="popuphiding"><![CDATA[
        try {
          this._currentFocus = document.commandDispatcher.focusedElement;
        } catch (e) {
          this._currentFocus = document.activeElement;
        }
      ]]></handler>
      <handler event="popuphidden"><![CDATA[
        function doFocus() {
          // Focus was set on an element inside this panel,
          // so we need to move it back to where it was previously
          try {
            let fm = Cc["@mozilla.org/focus-manager;1"]
                       .getService(Ci.nsIFocusManager);
            fm.setFocus(prevFocus, fm.FLAG_NOSCROLL);
          } catch (e) {
            prevFocus.focus();
          }
        }
        var currentFocus = this._currentFocus;
        var prevFocus = this._prevFocus ? this._prevFocus.get() : null;
        this._currentFocus = null;
        this._prevFocus = null;

        // Avoid changing focus if focus changed while we hide the popup
        // (This can happen e.g. if the popup is hiding as a result of a
        // click/keypress that focused something)
        let nowFocus;
        try {
          nowFocus = document.commandDispatcher.focusedElement;
        } catch (e) {
          nowFocus = document.activeElement;
        }
        if (nowFocus && nowFocus != currentFocus)
          return;

        if (prevFocus && this.getAttribute("norestorefocus") != "true") {
          // Try to restore focus
          try {
            if (document.commandDispatcher.focusedWindow != window)
              return; // Focus has already been set to a window outside of this panel
          } catch (ex) {}

          if (!currentFocus) {
            doFocus();
            return;
          }
          while (currentFocus) {
            if (currentFocus == this) {
              doFocus();
              return;
            }
            currentFocus = currentFocus.parentNode;
          }
        }
      ]]></handler>
    </handlers>
  </binding>

  <binding id="arrowpanel" extends="chrome://global/content/bindings/popup.xml#panel">
    <resources>
      <!-- Fixes an issue with the "test_arrowpanel.xul" animation on Mac, see bug 1470880. -->
      <stylesheet src="data:text/css,"/>
    </resources>

    <content flip="both" side="top" position="bottomcenter topleft" consumeoutsideclicks="false">
      <xul:vbox anonid="container" class="panel-arrowcontainer" flex="1"
               xbl:inherits="side,panelopen">
        <xul:box anonid="arrowbox" class="panel-arrowbox">
          <xul:image anonid="arrow" class="panel-arrow" xbl:inherits="side"/>
        </xul:box>
        <xul:box class="panel-arrowcontent" xbl:inherits="side,align,dir,orient,pack" flex="1">
          <children/>
        </xul:box>
      </xul:vbox>
    </content>
    <implementation>
      <field name="_fadeTimer">null</field>
      <method name="adjustArrowPosition">
        <body>
        <![CDATA[
        var anchor = this.anchorNode;
        if (!anchor) {
          return;
        }

        var container = document.getAnonymousElementByAttribute(this, "anonid", "container");
        var arrowbox = document.getAnonymousElementByAttribute(this, "anonid", "arrowbox");

        var position = this.alignmentPosition;
        var offset = this.alignmentOffset;

        this.setAttribute("arrowposition", position);

        if (position.indexOf("start_") == 0 || position.indexOf("end_") == 0) {
          container.orient = "horizontal";
          arrowbox.orient = "vertical";
          if (position.indexOf("_after") > 0) {
            arrowbox.pack = "end";
          } else {
            arrowbox.pack = "start";
          }
          arrowbox.style.transform = "translate(0, " + -offset + "px)";

          // The assigned side stays the same regardless of direction.
          var isRTL = (window.getComputedStyle(this).direction == "rtl");

          if (position.indexOf("start_") == 0) {
            container.dir = "reverse";
            this.setAttribute("side", isRTL ? "left" : "right");
          } else {
            container.dir = "";
            this.setAttribute("side", isRTL ? "right" : "left");
          }
        } else if (position.indexOf("before_") == 0 || position.indexOf("after_") == 0) {
          container.orient = "";
          arrowbox.orient = "";
          if (position.indexOf("_end") > 0) {
            arrowbox.pack = "end";
          } else {
            arrowbox.pack = "start";
          }
          arrowbox.style.transform = "translate(" + -offset + "px, 0)";

          if (position.indexOf("before_") == 0) {
            container.dir = "reverse";
            this.setAttribute("side", "bottom");
          } else {
            container.dir = "";
            this.setAttribute("side", "top");
          }
        }
        ]]>
        </body>
      </method>
    </implementation>
    <handlers>
      <handler event="popupshowing" phase="target">
      <![CDATA[
        var arrow = document.getAnonymousElementByAttribute(this, "anonid", "arrow");
        arrow.hidden = this.anchorNode == null;
        document.getAnonymousElementByAttribute(this, "anonid", "arrowbox")
                .style.removeProperty("transform");

        if (this.getAttribute("animate") != "false") {
          this.setAttribute("animate", "open");
          // the animating attribute prevents user interaction during transition
          // it is removed when popupshown fires
          this.setAttribute("animating", "true");
        }

        // set fading
        var fade = this.getAttribute("fade");
        var fadeDelay = 0;
        if (fade == "fast") {
          fadeDelay = 1;
        } else if (fade == "slow") {
          fadeDelay = 4000;
        } else {
          return;
        }

        this._fadeTimer = setTimeout(() => this.hidePopup(true), fadeDelay, this);
      ]]>
      </handler>
      <handler event="popuphiding" phase="target">
        let animate = (this.getAttribute("animate") != "false");

        if (this._fadeTimer) {
          clearTimeout(this._fadeTimer);
          if (animate) {
            this.setAttribute("animate", "fade");
          }
        } else if (animate) {
          this.setAttribute("animate", "cancel");
        }
      </handler>
      <handler event="popupshown" phase="target">
        this.removeAttribute("animating");
        this.setAttribute("panelopen", "true");
      </handler>
      <handler event="popuphidden" phase="target">
        this.removeAttribute("panelopen");
        if (this.getAttribute("animate") != "false") {
          this.removeAttribute("animate");
        }
      </handler>
      <handler event="popuppositioned" phase="target">
        this.adjustArrowPosition();
      </handler>
    </handlers>
  </binding>
</bindings>