gecko/toolkit/content/widgets/radio.xml

<?xml version="1.0"?>

<bindings id="radioBindings"
   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="radiogroup" extends="chrome://global/content/bindings/general.xml#basecontrol">
    <resources>
      <stylesheet src="chrome://global/skin/radio.css"/>
    </resources>

    <implementation implements="nsIDOMXULSelectControlElement, nsIAccessibleProvider">
      <constructor>
        <![CDATA[
          if (this.getAttribute("disabled") == "true")
            this.disabled = true;

          var children = this._getRadioChildren();
          var length = children.length;
          for (var i = 0; i < length; i++) {
            if (children[i].getAttribute("selected") == "true") {
              this.selectedIndex = i;
              return;
            }
          }

          var value = this.value;
          if (value)
            this.value = value;
          else
            this.selectedIndex = 0;
        ]]>
      </constructor>

      <property name="accessibleType" readonly="true">
        <getter>
          <![CDATA[
            return Components.interfaces.nsIAccessibleProvider.XULRadioGroup;
          ]]>
        </getter>
      </property>

      <property name="value" onget="return this.getAttribute('value');">
        <setter>
          <![CDATA[
            this.setAttribute("value", val);
            var children = this._getRadioChildren();
            for (var i = 0; i < children.length; i++) {
              if (String(children[i].value) == String(val)) {
                this.selectedItem = children[i];
                break;
              }
            }
            return val;
          ]]>
        </setter>
      </property>
      <property name="disabled">
        <getter>
        <![CDATA[
          if (this.getAttribute('disabled') == 'true')
            return true;
          var children = this._getRadioChildren();
          for (var i = 0; i < children.length; ++i) {
            if (!children[i].hidden && !children[i].collapsed && !children[i].disabled)
              return false;
          }
          return true;
        ]]>
        </getter>
        <setter>
        <![CDATA[
          if (val)
            this.setAttribute('disabled', 'true');
          else
            this.removeAttribute('disabled');
          var children = this._getRadioChildren();
          for (var i = 0; i < children.length; ++i) {
            children[i].disabled = val;
          }
          return val;
        ]]>
        </setter>
      </property>

      <property name="itemCount" readonly="true"
                onget="return this._getRadioChildren().length"/>

      <property name="selectedIndex">
        <getter>
        <![CDATA[
          var children = this._getRadioChildren();
          for (var i = 0; i < children.length; ++i) {
            if (children[i].selected)
              return i;
          }
          return -1;
        ]]>
        </getter>
        <setter>
        <![CDATA[
          this.selectedItem = this._getRadioChildren()[val];
          return val;
        ]]>
        </setter>
      </property>

      <property name="selectedItem">
        <getter>
        <![CDATA[
          var children = this._getRadioChildren();
          for (var i = 0; i < children.length; ++i) {
            if (children[i].selected)
              return children[i];
          }
          return null;
        ]]>
        </getter>
        <setter>
        <![CDATA[
          var focused = this.getAttribute("focused") == "true";
          var alreadySelected = false;

          if (val) {
            alreadySelected = val.getAttribute("selected") == "true";
            val.setAttribute("focused", focused);
            val.setAttribute("selected", "true");
            this.setAttribute("value", val.value);
          }
          else {
            this.removeAttribute("value");
          }

          // uncheck all other group nodes
          var children = this._getRadioChildren();
          var previousItem = null;
          for (var i = 0; i < children.length; ++i) {
            if (children[i] != val) {
              if (children[i].getAttribute("selected") == "true")
                previousItem = children[i];

              children[i].removeAttribute("selected");
              children[i].removeAttribute("focused");
            }
          }

          var event = document.createEvent("Events");
          event.initEvent("select", false, true);
          this.dispatchEvent(event);

          if (!alreadySelected && focused) {
            // Only report if actual change
            var myEvent;
            if (val) {
              myEvent = document.createEvent("Events");
              myEvent.initEvent("RadioStateChange", true, true);
              val.dispatchEvent(myEvent);
            }

            if (previousItem) {
              myEvent = document.createEvent("Events");
              myEvent.initEvent("RadioStateChange", true, true);
              previousItem.dispatchEvent(myEvent);
            }
          }

          return val;
        ]]>
        </setter>        
      </property>
      
      <property name="focusedItem">
        <getter>
        <![CDATA[
          var children = this._getRadioChildren();
          for (var i = 0; i < children.length; ++i) {
            if (children[i].getAttribute("focused") == "true")
              return children[i];
          }
          return null;
        ]]>
        </getter>
        <setter>
        <![CDATA[
          if (val) val.setAttribute("focused", "true");
          
          // unfocus all other group nodes
          var children = this._getRadioChildren();
          for (var i = 0; i < children.length; ++i) {
            if (children[i] != val)
              children[i].removeAttribute("focused");
          }
          return val;
        ]]>
        </setter>
      </property>
      
      <method name="checkAdjacentElement">
        <parameter name="aNextFlag"/>
        <body>
        <![CDATA[
          var currentElement = this.focusedItem || this.selectedItem;
          var i;
          var children = this._getRadioChildren();
          for (i = 0; i < children.length; ++i ) {
            if (children[i] == currentElement) 
              break;
          }
          var index = i;

          if (aNextFlag) {
            do {
              if (++i == children.length)
                i = 0;
              if (i == index)
                break;
            }
            while (children[i].hidden || children[i].collapsed || children[i].disabled);
            // XXX check for display/visibility props too

            this.selectedItem = children[i];
            children[i].doCommand();
          }
          else {              
            do {
              if (i == 0)
                i = children.length;
              if (--i == index)
                break;
            }
            while (children[i].hidden || children[i].collapsed || children[i].disabled);
            // XXX check for display/visibility props too

            this.selectedItem = children[i];
            children[i].doCommand();
          }
        ]]>
        </body>
      </method>
      <field name="_radioChildren">null</field>
      <method name="_getRadioChildren">
        <body>
        <![CDATA[
          if (this._radioChildren)
            return this._radioChildren;

          var radioChildren = [];
          var doc = this.ownerDocument;

          if (this.hasChildNodes()) {
            // Don't store the collected child nodes immediately,
            // collecting the child nodes could trigger constructors
            // which would blow away our list.

            const nsIDOMNodeFilter = Components.interfaces.nsIDOMNodeFilter;
            var iterator = doc.createTreeWalker(this,
                                                nsIDOMNodeFilter.SHOW_ELEMENT,
                                                this._filterRadioGroup,
                                                true);
            while (iterator.nextNode())
              radioChildren.push(iterator.currentNode);
            return this._radioChildren = radioChildren;
          }

          // We don't have child nodes.
          const XUL_NS = "http://www.mozilla.org/keymaster/"
                       + "gatekeeper/there.is.only.xul";
          var elems = doc.getElementsByAttribute("group", this.id);
          for (var i = 0; i < elems.length; i++) {
            if ((elems[i].namespaceURI == XUL_NS) &&
                (elems[i].localName == "radio")) {
              radioChildren.push(elems[i]);
            }
          }
          return this._radioChildren = radioChildren;
        ]]>
        </body>
      </method>
      <method name="_filterRadioGroup">
        <parameter name="node"/>
        <body>
        <![CDATA[
          switch (node.localName) {
            case "radio": return NodeFilter.FILTER_ACCEPT;
            case "template":
            case "radiogroup": return NodeFilter.FILTER_REJECT;
            default: return NodeFilter.FILTER_SKIP;
          }
        ]]>
        </body>
      </method>

      <method name="getIndexOfItem">
        <parameter name="item"/>
        <body>
          return this._getRadioChildren().indexOf(item);
        </body>
      </method>

      <method name="getItemAtIndex">
        <parameter name="index"/>
        <body>
        <![CDATA[
          var children = this._getRadioChildren();
          return (index >= 0 && index < children.length) ? children[index] : null;
        ]]>
        </body>
      </method>

      <method name="appendItem">
        <parameter name="label"/>
        <parameter name="value"/>
        <body>
        <![CDATA[
          var XULNS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
          var radio = document.createElementNS(XULNS, "radio");
          radio.setAttribute("label", label);
          radio.setAttribute("value", value);
          this.appendChild(radio);
          this._radioChildren = null;
          return radio;
        ]]>
        </body>
      </method>
      
      <method name="insertItemAt">
        <parameter name="index"/>
        <parameter name="label"/>
        <parameter name="value"/>
        <body>
        <![CDATA[
          var XULNS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
          var radio = document.createElementNS(XULNS, "radio");
          radio.setAttribute("label", label);
          radio.setAttribute("value", value);
          var before = this.getItemAtIndex(index);
          if (before)
            before.parentNode.insertBefore(radio, before);
          else
            this.appendChild(radio);
          this._radioChildren = null;
          return radio;
        ]]>
        </body>
      </method>

      <method name="removeItemAt">
        <parameter name="index"/>
        <body>
        <![CDATA[
          var remove = this.getItemAtIndex(index);
          if (remove) {
            remove.parentNode.removeChild(remove);
            this._radioChildren = null;
          }
          return remove;
        ]]>
        </body>
      </method>
    </implementation>
    
    <handlers>
      <handler event="mousedown">
        if (this.disabled)
          event.preventDefault();
       </handler>
     
      <!-- keyboard navigation -->
      <!-- Here's how keyboard navigation works in radio groups on Windows:
           The group takes 'focus'
           The user is then free to navigate around inside the group
           using the arrow keys. Accessing previous or following radio buttons
           is done solely through the arrow keys and not the tab button. Tab
           takes you to the next widget in the tab order -->
      <handler event="keypress" key=" " phase="target">
         this.selectedItem = this.focusedItem;
         this.selectedItem.doCommand();
      </handler>
      <handler event="keypress" keycode="VK_UP" phase="target">
        this.checkAdjacentElement(false);
        event.stopPropagation();
      </handler>
      <handler event="keypress" keycode="VK_LEFT" phase="target">
        // left arrow goes back when we are ltr, forward when we are rtl
        this.checkAdjacentElement(document.defaultView.getComputedStyle(
                                    this, "").direction == "rtl");
        event.stopPropagation();
      </handler>
      <handler event="keypress" keycode="VK_DOWN" phase="target">
        this.checkAdjacentElement(true);
        event.stopPropagation();
      </handler>
      <handler event="keypress" keycode="VK_RIGHT" phase="target">
        // right arrow goes forward when we are ltr, back when we are rtl
        this.checkAdjacentElement(document.defaultView.getComputedStyle(
                                    this, "").direction == "ltr");
        event.stopPropagation();
      </handler>

      <!-- set a focused attribute on the selected item when the group
           receives focus so that we can style it as if it were focused even though
           it is not (Windows platform behaviour is for the group to receive focus,
           not the item -->
      <handler event="focus" phase="target">
        <![CDATA[
          this.setAttribute("focused", "true");
          if (this.focusedItem)
            return;

          var val = this.selectedItem;
          if (!val || val.disabled || val.hidden || val.collapsed) {
            var children = this._getRadioChildren();
            for (var i = 0; i < children.length; ++i) {
              if (!children[i].hidden && !children[i].collapsed && !children[i].disabled) {
                val = children[i];
                break;
              }
            }
          }
          this.focusedItem = val;
        ]]>
      </handler>
      <handler event="blur" phase="target">
        this.removeAttribute("focused");
        this.focusedItem = null;
      </handler>
    </handlers>
  </binding>

  <binding id="radio" extends="chrome://global/content/bindings/general.xml#control-item">
    <resources>
      <stylesheet src="chrome://global/skin/radio.css"/>
    </resources>

    <content>
      <xul:image class="radio-check" xbl:inherits="disabled,selected"/>
      <xul:hbox class="radio-label-box" align="center" flex="1">
        <xul:image class="radio-icon" xbl:inherits="src"/>
        <xul:label class="radio-label" xbl:inherits="xbl:text=label,accesskey,crop" flex="1"/>
      </xul:hbox>
    </content>

    <implementation implements="nsIDOMXULSelectControlItemElement, nsIAccessibleProvider">
      <constructor>
        <![CDATA[
          // Just clear out the parent's cached list of radio children
          var control = this.control;
          if (control)
            control._radioChildren = null;
        ]]>
      </constructor>
      <destructor>
        <![CDATA[
          var radioList = this.radioGroup.mRadioChildren;
          if (!radioList)
            return;
          for (var i = 0; i < radioList.length; ++i) {
            if (radioList[i] == this) {
              radioList.splice(i, 1);
              return;
            }
          }
        ]]>
      </destructor>
      <property name="accessibleType" readonly="true">
        <getter>
          <![CDATA[
            return Components.interfaces.nsIAccessibleProvider.XULRadioButton;
          ]]>
        </getter>
      </property>
      <property name="selected" readonly="true">
        <getter>
          <![CDATA[
            return this.hasAttribute('selected');
          ]]>
        </getter>
      </property>
      <property name="radioGroup" readonly="true" onget="return this.control"/>
      <property name="control" readonly="true">
        <getter>
        <![CDATA[
          const XUL_NS = "http://www.mozilla.org/keymaster/"
                       + "gatekeeper/there.is.only.xul";
          var parent = this.parentNode;
          while (parent) {
            if ((parent.namespaceURI == XUL_NS) &&
                (parent.localName == "radiogroup")) {
              return parent;
            }
            parent = parent.parentNode;
          }

          var group = this.getAttribute("group");
          if (!group) {
            return null;
          }

          parent = this.ownerDocument.getElementById(group);
          if (!parent ||
              (parent.namespaceURI != XUL_NS) ||
              (parent.localName != "radiogroup")) {
            parent = null;
          }
          return parent;
        ]]>
        </getter>
      </property>
    </implementation>
    <handlers>
      <handler event="click" button="0">
        <![CDATA[
          if (!this.disabled)
            this.control.selectedItem = this;
         ]]>
      </handler>

      <handler event="mousedown" button="0">
        <![CDATA[
          if (!this.disabled)
            this.control.focusedItem = this;
         ]]>
      </handler>
      <handler event="focus">
        <![CDATA[
          if (!this.disabled) {
            this.control.focusedItem = this;
            this.control.focus();
          }
         ]]>
      </handler>
    </handlers>
  </binding>
</bindings>