* Migrate set initial directory.

* Migrate open multiple files.

* Migrate windows get save path.

* Rename variable and methods, reorder functions and remove unused parameters.

* Remove CPP implementation.

* Update package version.

Author: Juan Ángel Dausa

packages/file_selector/file_selector_windows/CHANGELOG.md

@@ -1,5 +1,6 @@
-## NEXT
+## 0.10.0
 
+* Migrate CCP implementation to Dart.
 * Updates minimum Flutter version to 2.10.
 
 ## 0.9.1+2

packages/file_selector/file_selector_windows/example/windows/flutter/generated_plugins.cmake

@@ -3,7 +3,6 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
-  file_selector_windows
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST

packages/file_selector/file_selector_windows/lib/file_selector_windows.dart

@@ -3,16 +3,23 @@
 // found in the LICENSE file.
 
 import 'package:file_selector_platform_interface/file_selector_platform_interface.dart';
-
+import 'package:file_selector_windows/src/dart_file_selector_api.dart';
 import 'src/messages.g.dart';
 
 /// An implementation of [FileSelectorPlatform] for Windows.
 class FileSelectorWindows extends FileSelectorPlatform {
-  final FileSelectorApi _hostApi = FileSelectorApi();
+  /// Constructor for filePicker.
+  FileSelectorWindows([this._filePicker]) {
+    _filePicker = _filePicker ?? DartFileSelectorAPI();
+    _internalFilePicker = _filePicker!;
+  }
+
+  late DartFileSelectorAPI _internalFilePicker;
+  late DartFileSelectorAPI? _filePicker;
 
   /// Registers the Windows implementation.
-  static void registerWith() {
-    FileSelectorPlatform.instance = FileSelectorWindows();
+  static void registerWith([DartFileSelectorAPI? filePicker]) {
+    FileSelectorPlatform.instance = FileSelectorWindows(filePicker);
   }
 
   @override
@@ -21,15 +28,15 @@ class FileSelectorWindows extends FileSelectorPlatform {
     String? initialDirectory,
     String? confirmButtonText,
   }) async {
-    final List<String?> paths = await _hostApi.showOpenDialog(
-        SelectionOptions(
+    final List<String> paths = _internalFilePicker.getFiles(
+        selectionOptions: SelectionOptions(
           allowMultiple: false,
           selectFolders: false,
           allowedTypes: _typeGroupsFromXTypeGroups(acceptedTypeGroups),
         ),
-        initialDirectory,
-        confirmButtonText);
-    return paths.isEmpty ? null : XFile(paths.first!);
+        initialDirectory: initialDirectory,
+        confirmButtonText: confirmButtonText);
+    return paths.isEmpty ? null : XFile(paths.first);
   }
 
   @override
@@ -38,14 +45,14 @@ class FileSelectorWindows extends FileSelectorPlatform {
     String? initialDirectory,
     String? confirmButtonText,
   }) async {
-    final List<String?> paths = await _hostApi.showOpenDialog(
-        SelectionOptions(
+    final List<String?> paths = _internalFilePicker.getFiles(
+        selectionOptions: SelectionOptions(
           allowMultiple: true,
           selectFolders: false,
           allowedTypes: _typeGroupsFromXTypeGroups(acceptedTypeGroups),
         ),
-        initialDirectory,
-        confirmButtonText);
+        initialDirectory: initialDirectory,
+        confirmButtonText: confirmButtonText);
     return paths.map((String? path) => XFile(path!)).toList();
   }
 
@@ -56,32 +63,28 @@ class FileSelectorWindows extends FileSelectorPlatform {
     String? suggestedName,
     String? confirmButtonText,
   }) async {
-    final List<String?> paths = await _hostApi.showSaveDialog(
-        SelectionOptions(
-          allowMultiple: false,
-          selectFolders: false,
-          allowedTypes: _typeGroupsFromXTypeGroups(acceptedTypeGroups),
-        ),
-        initialDirectory,
-        suggestedName,
-        confirmButtonText);
-    return paths.isEmpty ? null : paths.first!;
+    final String? path = _internalFilePicker.getSavePath(
+      initialDirectory: initialDirectory,
+      suggestedFileName: suggestedName,
+      confirmButtonText: confirmButtonText,
+      selectionOptions: SelectionOptions(
+        allowMultiple: false,
+        selectFolders: false,
+        allowedTypes: _typeGroupsFromXTypeGroups(acceptedTypeGroups),
+      ),
+    );
+    return path == null ? null : Future<String>.value(path);
   }
 
   @override
   Future<String?> getDirectoryPath({
     String? initialDirectory,
     String? confirmButtonText,
   }) async {
-    final List<String?> paths = await _hostApi.showOpenDialog(
-        SelectionOptions(
-          allowMultiple: false,
-          selectFolders: true,
-          allowedTypes: <TypeGroup>[],
-        ),
-        initialDirectory,
-        confirmButtonText);
-    return paths.isEmpty ? null : paths.first!;
+    final String? path = _internalFilePicker.getDirectoryPath(
+        initialDirectory: initialDirectory,
+        confirmButtonText: confirmButtonText);
+    return path == null ? null : Future<String>.value(path);
   }
 }
 

packages/file_selector/file_selector_windows/lib/src/dart_file_dialog.dart

@@ -0,0 +1,39 @@
+import 'package:win32/win32.dart';
+import 'dart_place.dart';
+
+/// Exposes custom places.
+class CustomPlace {
+  /// CustomPlace constructor.
+  CustomPlace(this.item, this.place);
+
+  /// An IShellItem.
+  IShellItem item;
+
+  /// A Place.
+  Place place;
+}
+
+/// An abstract of FileDialog, that allows user to interact with the file system.
+abstract class FileDialog {
+  /// Sets a filter for the file types shown.
+  ///
+  /// When using the Open dialog, the file types declared here are used to
+  /// filter the view. When using the Save dialog, these values determine which
+  /// file name extension is appended to the file name.
+  ///
+  /// The first value is the "friendly" name which is shown to the user (e.g.
+  /// `JPEG Files`); the second value is a filter, which may be a semicolon-
+  /// separated list (for example `*.jpg;*.jpeg`).
+  Map<String, String> filterSpecification = <String, String>{};
+
+  /// Set hWnd of dialog
+  int hWndOwner = NULL;
+
+  /// Sets is save dialog option, this allows the user to select inixistent files.
+  bool fileMustExist = false;
+
+  /// Clears the current filter specification, this way a new filter can be added.
+  void clearFilterSpecification() {
+    filterSpecification = <String, String>{};
+  }
+}

packages/file_selector/file_selector_windows/lib/src/dart_file_open_dialog_api.dart

@@ -0,0 +1,79 @@
+import 'dart:ffi';
+
+import 'package:ffi/ffi.dart';
+import 'package:win32/win32.dart';
+
+/// FileOpenDialogAPI provider, it used to interact with an IFileOpenDialogInstance.
+class FileOpenDialogAPI {
+  /// Sets dialog options.
+  int setOptions(int options, IFileOpenDialog dialog) {
+    return dialog.setOptions(options);
+  }
+
+  /// Returns dialog options.
+  int getOptions(Pointer<Uint32> ptrOptions, IFileOpenDialog dialog) {
+    return dialog.getOptions(ptrOptions);
+  }
+
+  /// Set confirmation button text on dialog.
+  int setOkButtonLabel(String? confirmationText, IFileOpenDialog dialog) {
+    return dialog.setOkButtonLabel(TEXT(confirmationText ?? 'Pick'));
+  }
+
+  /// Sets allowed file type extensions.
+  int setFileTypes(
+      Map<String, String> filterSpecification, IFileOpenDialog dialog) {
+    final Pointer<COMDLG_FILTERSPEC> registerFilterSpecification =
+        calloc<COMDLG_FILTERSPEC>(filterSpecification.length);
+
+    int index = 0;
+    for (final String key in filterSpecification.keys) {
+      registerFilterSpecification[index]
+        ..pszName = TEXT(key)
+        ..pszSpec = TEXT(filterSpecification[key]!);
+      index++;
+    }
+
+    return dialog.setFileTypes(
+        filterSpecification.length, registerFilterSpecification);
+  }
+
+  /// Shows a dialog.
+  int show(int hwndOwner, IFileOpenDialog dialog) {
+    return dialog.show(hwndOwner);
+  }
+
+  /// Release a dialog.
+  int release(IFileOpenDialog dialog) {
+    return dialog.release();
+  }
+
+  /// Return a result from a dialog.
+  int getResult(
+      Pointer<Pointer<COMObject>> ptrCOMObject, IFileOpenDialog dialog) {
+    return dialog.getResult(ptrCOMObject);
+  }
+
+  /// Return results from a dialog, this should be used when selecting multiple items.
+  int getResults(
+      Pointer<Pointer<COMObject>> ptrCOMObject, IFileOpenDialog dialog) {
+    return dialog.getResults(ptrCOMObject);
+  }
+
+  /// Sets the initial directory for a dialog.
+  int setFolder(Pointer<Pointer<COMObject>> ptrPath, IFileOpenDialog dialog) {
+    return dialog.setFolder(ptrPath.value);
+  }
+
+  /// Sets the file name for a dialog.
+  int setFileName(String suggestedFileName, IFileOpenDialog dialog) {
+    return dialog.setFileName(TEXT(suggestedFileName));
+  }
+
+  /// Creates item from a given initial directory. This throws if the directory does not exist.
+  int createItemFromParsingName(String initialDirectory, Pointer<GUID> ptrGuid,
+      Pointer<Pointer<NativeType>> ptrPath) {
+    return SHCreateItemFromParsingName(
+        TEXT(initialDirectory), nullptr, ptrGuid, ptrPath);
+  }
+}