enable custom view widgets;

lib/country_code_picker.dart

@@ -17,6 +17,7 @@ class CountryCodePicker extends StatefulWidget {
   final InputDecoration searchDecoration;
   final TextStyle searchStyle;
   final WidgetBuilder emptySearchBuilder;
+  final Widget customWidget;
 
   /// shows the name of the country instead of the dialcode
   final bool showOnlyCountryWhenClosed;
@@ -43,7 +44,8 @@ class CountryCodePicker extends StatefulWidget {
     this.emptySearchBuilder,
     this.showOnlyCountryWhenClosed = false,
     this.alignLeft = false,
-    this.showFlag = true
+    this.showFlag = true,
+    this.customWidget,
   });
 
   @override
@@ -71,39 +73,49 @@ class _CountryCodePickerState extends State<CountryCodePicker> {
   _CountryCodePickerState(this.elements);
 
   @override
-  Widget build(BuildContext context) => FlatButton(
-        child: Flex(
-          direction: Axis.horizontal,
-          mainAxisSize: MainAxisSize.min,
-          children: <Widget>[
-            widget.showFlag ? Flexible(
-              flex: widget.alignLeft ? 0 : 1,
-              fit: widget.alignLeft ? FlexFit.tight : FlexFit.loose,
-              child: Padding(
-                padding: widget.alignLeft
-                    ? const EdgeInsets.only(right: 16.0, left: 8.0)
-                    : const EdgeInsets.only(right: 16.0),
-                child: Image.asset(
-                  selectedItem.flagUri,
-                  package: 'country_code_picker',
-                  width: 32.0,
-                ),
-              ),
-            ) : Container(),
-            Flexible(
-              fit: widget.alignLeft ? FlexFit.tight : FlexFit.loose,
-              child: Text(
-                widget.showOnlyCountryWhenClosed
-                    ? selectedItem.toCountryStringOnly()
-                    : selectedItem.toString(),
-                style: widget.textStyle ?? Theme.of(context).textTheme.button,
-              ),
+  Widget build(BuildContext context) {
+    Widget _widget;
+    if (widget.customWidget != null)
+      _widget = widget.customWidget;
+    else {
+      _widget = Flex(
+        direction: Axis.horizontal,
+        mainAxisSize: MainAxisSize.min,
+        children: <Widget>[
+          widget.showFlag
+              ? Flexible(
+                  flex: widget.alignLeft ? 0 : 1,
+                  fit: widget.alignLeft ? FlexFit.tight : FlexFit.loose,
+                  child: Padding(
+                    padding: widget.alignLeft
+                        ? const EdgeInsets.only(right: 16.0, left: 8.0)
+                        : const EdgeInsets.only(right: 16.0),
+                    child: Image.asset(
+                      selectedItem.flagUri,
+                      package: 'country_code_picker',
+                      width: 32.0,
+                    ),
+                  ),
+                )
+              : Container(),
+          Flexible(
+            fit: widget.alignLeft ? FlexFit.tight : FlexFit.loose,
+            child: Text(
+              widget.showOnlyCountryWhenClosed
+                  ? selectedItem.toCountryStringOnly()
+                  : selectedItem.toString(),
+              style: widget.textStyle ?? Theme.of(context).textTheme.button,
             ),
-          ],
-        ),
-        padding: widget.padding,
-        onPressed: _showSelectionDialog,
+          ),
+        ],
       );
+    }
+    return FlatButton(
+      child: _widget,
+      padding: widget.padding,
+      onPressed: _showSelectionDialog,
+    );
+  }
 
   @override
   initState() {
@@ -130,16 +142,12 @@ class _CountryCodePickerState extends State<CountryCodePicker> {
   void _showSelectionDialog() {
     showDialog(
       context: context,
-      builder: (_) =>
-        SelectionDialog(
-          elements,
-          favoriteElements,
+      builder: (_) => SelectionDialog(elements, favoriteElements,
           showCountryOnly: widget.showCountryOnly,
           emptySearchBuilder: widget.emptySearchBuilder,
           searchDecoration: widget.searchDecoration,
           searchStyle: widget.searchStyle,
-          showFlag: widget.showFlag
-        ),
+          showFlag: widget.showFlag),
     ).then((e) {
       if (e != null) {
         setState(() {