Implement and apply `PdfActionBarTheme`

+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+
+class PdfActionBarTheme with Diagnosticable {
+  /// Creates a theme for action bar of [PdfPreviewController].
+  const PdfActionBarTheme({
+    this.backgroundColor,
+    this.iconColor,
+    this.height,
+    this.textStyle,
+    this.elevation = 4,
+    this.alignment = WrapAlignment.spaceAround,
+  });
+
+  final Color? backgroundColor;
+  final Color? iconColor;
+  final double? height;
+  final TextStyle? textStyle;
+  final double elevation;
+  final WrapAlignment alignment;
+
+  /// Creates a copy of this object but with the given fields replaced with the
+  /// new values.
+  PdfActionBarTheme copyWith({
+    Color? backgroundColor,
+    Color? iconColor,
+    double? height,
+    TextStyle? textStyle,
+    double? elevation,
+    WrapAlignment? alignment,
+  }) {
+    return PdfActionBarTheme(
+      backgroundColor: backgroundColor ?? this.backgroundColor,
+      iconColor: iconColor ?? this.iconColor,
+      height: height ?? this.height,
+      textStyle: textStyle ?? this.textStyle,
+      elevation: elevation ?? this.elevation,
+      alignment: alignment ?? this.alignment,
+    );
+  }
+
+  @override
+  int get hashCode => Object.hashAll(
+      [backgroundColor, iconColor, height, textStyle, elevation, alignment]);
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) {
+      return true;
+    }
+    if (other.runtimeType != runtimeType) {
+      return false;
+    }
+    return other is PdfActionBarTheme &&
+        other.backgroundColor == backgroundColor &&
+        other.iconColor == iconColor &&
+        other.height == height &&
+        other.textStyle == textStyle &&
+        other.elevation == elevation &&
+        other.alignment == alignment;
+  }
+
+  @override
+  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
+    super.debugFillProperties(properties);
+    properties.add(ColorProperty('backgroundColor', backgroundColor));
+    properties.add(ColorProperty('iconColor', iconColor));
+    properties.add(DoubleProperty('height', height));
+    properties.add(DiagnosticsProperty<TextStyle>('textStyle', textStyle));
+    properties.add(DoubleProperty('elevation', elevation));
+    properties.add(DiagnosticsProperty<WrapAlignment>('alignment', alignment,
+        defaultValue: WrapAlignment.spaceAround));
+  }
+}

@@ -21,6 +21,7 @@ import 'package:pdf/widgets.dart' as pw;
 import '../callback.dart';
 import '../printing.dart';
 import '../printing_info.dart';
+import 'action_bar_theme.dart';
 import 'actions.dart';
 import 'controller.dart';
 import 'custom.dart';
@@ -62,6 +63,7 @@ class PdfPreview extends StatefulWidget {
     this.loadingWidget,
     this.onPageFormatChanged,
     this.dpi,
+    this.actionBarTheme = const PdfActionBarTheme(),
   })  : _pagesBuilder = null,
         super(key: key);
 
@@ -119,6 +121,7 @@ class PdfPreview extends StatefulWidget {
     this.loadingWidget,
     this.onPageFormatChanged,
     this.dpi,
+    this.actionBarTheme = const PdfActionBarTheme(),
     required CustomPdfPagesBuilder pagesBuilder,
   })  : _pagesBuilder = pagesBuilder,
         super(key: key);
@@ -223,6 +226,9 @@ class PdfPreview extends StatefulWidget {
   /// If not provided, this value is calculated.
   final double? dpi;
 
+  /// The style of actions bar.
+  final PdfActionBarTheme actionBarTheme;
+
   /// clients can pass this builder to render
   /// their own pages.
   final CustomPdfPagesBuilder? _pagesBuilder;
@@ -406,16 +412,19 @@ class PdfPreviewState extends State<PdfPreview> {
           if (actions.isNotEmpty)
             IconTheme.merge(
               data: IconThemeData(
-                color: iconColor,
+                color: widget.actionBarTheme.iconColor ?? iconColor,
               ),
               child: Material(
-                elevation: 4,
-                color: theme.primaryColor,
+                elevation: widget.actionBarTheme.elevation,
+                color:
+                    widget.actionBarTheme.backgroundColor ?? theme.primaryColor,
+                textStyle: widget.actionBarTheme.textStyle,
                 child: SizedBox(
                   width: double.infinity,
+                  height: widget.actionBarTheme.height,
                   child: SafeArea(
                     child: Wrap(
-                      alignment: WrapAlignment.spaceAround,
+                      alignment: widget.actionBarTheme.alignment,
                       children: actions,
                     ),
                   ),