Improve KeyPadButton text style resolution

lib/src/configurations/key_pad_button_config.dart

@@ -38,7 +38,17 @@ class KeyPadButtonConfig {
     );
     if (buttonStyle != null) {
       return buttonStyle!.copyWith(
-        textStyle: composed.textStyle,
+        textStyle: WidgetStateProperty.resolveWith((Set<WidgetState> states) {
+          final TextStyle? composedTextStyle =
+              composed.textStyle?.resolve(states);
+          final TextStyle? buttonTextStyle =
+              buttonStyle?.textStyle?.resolve(states);
+
+          // If buttonTextStyle is null, and composedTextStyle is not null, use composedTextStyle.
+          // If buttonTextStyle is not null, merge it with composedTextStyle.
+          // If both are null, the result will be null.
+          return buttonTextStyle?.merge(composedTextStyle) ?? composedTextStyle;
+        }),
         foregroundColor: composed.foregroundColor,
         backgroundColor: composed.backgroundColor,
       );

lib/src/screen_lock.dart

@@ -34,6 +34,7 @@ class ScreenLock extends StatefulWidget {
     this.secretsBuilder,
     this.useBlur = true,
     this.useLandscape = true,
+    this.backgroundBuilder,
   })  : title = title ?? const Text('Please enter passcode.'),
         confirmTitle = null,
         digits = correctString.length,
@@ -69,6 +70,7 @@ class ScreenLock extends StatefulWidget {
     this.secretsBuilder,
     this.useBlur = true,
     this.useLandscape = true,
+    this.backgroundBuilder,
   })  : correctString = null,
         title = title ?? const Text('Please enter new passcode.'),
         confirmTitle =
@@ -158,6 +160,9 @@ class ScreenLock extends StatefulWidget {
   /// Custom secrets animation widget builder.
   final SecretsBuilderCallback? secretsBuilder;
 
+  /// Custom background widget builder.
+  final BackgroundBuilderCallback? backgroundBuilder;
+
   /// Blur the background.
   final bool useBlur;
 
@@ -353,7 +358,6 @@ class _ScreenLockState extends State<ScreenLock> {
     return KeyEventResult.ignored; // Let other handlers process the event
   }
 
-
   Widget buildDelayChild(Duration duration) {
     if (widget.delayBuilder != null) {
       return widget.delayBuilder!(context, duration);
@@ -515,14 +519,25 @@ class _ScreenLockState extends State<ScreenLock> {
     return Theme(
       data: (widget.config ?? ScreenLockConfig.defaultConfig).toThemeData(),
       child: Scaffold(
-        body: SafeArea(
-          child: Focus(
-            focusNode: _focusNode,
-            autofocus: true,
-            onKeyEvent: _onKeyEvent,
-            child: buildContentWithBlur(useBlur: widget.useBlur),
-          ),
-        ),
+        body: widget.backgroundBuilder != null
+            ? widget.backgroundBuilder!(
+                context: context,
+                child: SafeArea(
+                  child: Focus(
+                    focusNode: _focusNode,
+                    autofocus: true,
+                    onKeyEvent: _onKeyEvent,
+                    child: buildContentWithBlur(useBlur: widget.useBlur),
+                  ),
+                ))
+            : SafeArea(
+                child: Focus(
+                  focusNode: _focusNode,
+                  autofocus: true,
+                  onKeyEvent: _onKeyEvent,
+                  child: buildContentWithBlur(useBlur: widget.useBlur),
+                ),
+              ),
       ),
     );
   }
@@ -539,6 +554,12 @@ typedef SecretsBuilderCallback = Widget Function(
   Stream<bool> verifyStream,
 );
 
+typedef BackgroundBuilderCallback = Widget Function(
+    {required BuildContext context, required Widget child});
+
+BackgroundBuilderCallback defaultBackgroundBuilder =
+    ({required BuildContext context, required Widget child}) => child;
+
 typedef ValidationCallback = Future<bool> Function(
   String input,
 );