Disable user input in SignaturePad when enabled is set to false

Author: danvick

lib/src/fields/form_builder_signature_pad.dart

@@ -73,17 +73,26 @@ class FormBuilderSignaturePad extends FormBuilderField<Uint8List> {
               child: Column(
                 children: <Widget>[
                   Container(
-                    decoration: BoxDecoration(border: border),
-                    child: GestureDetector(
-                      onHorizontalDragUpdate: (_) {},
-                      onVerticalDragUpdate: (_) {},
-                      child: Signature(
-                        controller: state._controller,
-                        width: width,
-                        height: height,
-                        backgroundColor: backgroundColor,
+                    height: height,
+                    width: width,
+                    decoration: BoxDecoration(
+                      border: border,
+                      image: state.enabled ? null : DecorationImage(
+                        image: MemoryImage(state.value),
                       ),
                     ),
+                    child: state.enabled
+                        ? GestureDetector(
+                            onHorizontalDragUpdate: (_) {},
+                            onVerticalDragUpdate: (_) {},
+                            child: Signature(
+                              controller: state._controller,
+                              width: width,
+                              height: height,
+                              backgroundColor: backgroundColor,
+                            ),
+                          )
+                        : null,
                   ),
                   Row(
                     children: <Widget>[
@@ -145,35 +154,4 @@ class _FormBuilderSignaturePadState
     _controller?.clear();
     super.reset();
   }
-
-/*@override
-  void didUpdateWidget(FormBuilderSignaturePad oldWidget) {
-    print("Widget did update...");
-    super.didUpdateWidget(oldWidget);
-    if (widget.controller != oldWidget.controller) {
-      oldWidget.controller?.removeListener(_handleControllerChanged);
-      widget.controller?.addListener(_handleControllerChanged);
-
-      if (oldWidget.controller != null && widget.controller == null) {
-        _controller = SignatureController(points: oldWidget.controller.value);
-      }
-      if (widget.controller != null) {
-        setValue(widget.controller.value);
-        if (oldWidget.controller == null) _controller = null;
-      }
-    }
-  }
-
-  void _handleControllerChanged() {
-    // Suppress changes that originated from within this class.
-    //
-    // In the case where a controller has been passed in to this widget, we
-    // register this change listener. In these cases, we'll also receive change
-    // notifications for changes originating from within this class -- for
-    // example, the reset() method. In such cases, the FormField value will
-    // already have been set.
-    if (signatureController.value != value) {
-      didChange(signatureController.value);
-    }
-  }*/
 }