Implement Clipboard for Windows

example/README.md

@@ -8,6 +8,7 @@ This package comes with a number of examples to demonstrate various features.
 | `bar.dart` | Simple demonstration of DrawingCanvas for drawing a vertical bar. |
 | `canvas.dart` | Shows use of ConsoleCanvas for character-based positioning. |
 | `choice.dart` | Select a multiple choice option. |
+| `clipboard.dart` | Simple example of clipboard operation. |
 | `clock.dart` | Sophisticated example of using DrawingCanvas to display a clock. |
 | `colors.dart` | Setting colored output with the TextPen class. |
 | `cube.dart` | Draws a 3D cube with DrawingCanvas. |

example/clipboard.dart

@@ -0,0 +1,18 @@
+import 'package:console/console.dart';
+
+import 'dart:io';
+
+void main() {
+  var clip = getClipboard();
+  if (clip == null) {
+    throw Exception('${Platform.operatingSystem} is not supported.');
+  }
+
+  var prev = clip.getContent();
+  print('Previous clipboard: $prev');
+
+  clip.setContent('Hello!');
+
+  var cur = clip.getContent();
+  print('Current clipboard: $cur');
+}

lib/console.dart

@@ -3,6 +3,8 @@ library console;
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
+import 'package:ffi/ffi.dart';
+import 'package:win32/win32.dart';
 
 part 'src/base.dart';
 part 'src/clipboard.dart';

lib/src/clipboard.dart

@@ -5,6 +5,7 @@ Clipboard? getClipboard() {
   if (Platform.isLinux && File('/usr/bin/xclip').existsSync()) {
     return XClipboard();
   }
+  if (Platform.isWindows) return WinClipboard();
   return null;
 }
 
@@ -53,3 +54,31 @@ class XClipboard implements Clipboard {
     });
   }
 }
+
+class WinClipboard implements Clipboard {
+  @override
+  String getContent() {
+    OpenClipboard(NULL);
+    if (IsClipboardFormatAvailable(CF_TEXT) == FALSE) return '';
+
+    var hg = GetClipboardData(CF_TEXT);
+    if (hg == NULL) return '';
+
+    var ptstr = GlobalLock(hg);
+
+    GlobalUnlock(hg);
+    CloseClipboard();
+
+    return ptstr.cast<Utf8>().toDartString();
+  }
+
+  @override
+  void setContent(String content) {
+    var ptstr = content.toNativeUtf8();
+
+    OpenClipboard(NULL);
+    EmptyClipboard();
+    SetClipboardData(CF_TEXT, ptstr.address);
+    CloseClipboard();
+  }
+}

pubspec.yaml

@@ -8,7 +8,9 @@ environment:
   sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
+  ffi: ^1.1.2
   vector_math: ^2.1.0
+  win32: ^2.2.5
 
 dev_dependencies:
   test: ^1.16.8