core:Introduce native clipboard for most target OS

Author: akshayaurora

kivy/core/clipboard/__init__.py

@@ -119,7 +119,21 @@ def _paste(self):
 if _platform == 'android':
     _clipboards.append(
         ('android', 'clipboard_android', 'ClipboardAndroid'))
+    _clipboards.append(
+        ('sdl2', 'clipboard_sdl2', 'ClipboardSDL2'))
+elif _platform == 'ios':
+    _clipboards.append(
+        ('sdl2', 'clipboard_sdl2', 'ClipboardSDL2'))
 elif _platform in ('macosx', 'linux', 'win'):
+    if _platform == 'macosx':
+        _clipboards.append(
+            ('nspaste', 'clipboard_nspaste', 'ClipboardNSPaste'))
+    elif _platform == 'win':
+        _clipboards.append(
+            ('winctypes', 'clipboard_winctypes', 'ClipboardWindows'))
+    elif _platform == 'linux':
+        _clipboards.append(('dbusklipper', 'clipboard_dbusklipper', 'Clipboard_DbusKlipper'))
+
     _clipboards.append(
         ('pygame', 'clipboard_pygame', 'ClipboardPygame'))
     _clipboards.append(

kivy/core/clipboard/clipboard_nspaste.py

@@ -0,0 +1,40 @@
+'''
+Clipboard OsX: implementation of clipboard using Appkit
+'''
+
+__all__ = ('ClipboardNSPaste', )
+
+from kivy.core.clipboard import ClipboardBase
+from kivy.utils import platform
+
+if platform != 'macosx':
+    raise SystemError('Unsupported platform for appkit clipboard.')
+try:
+    from pyobjus import autoclass
+    from pyobjus.dylib_manager import load_framework, INCLUDE
+    load_framework(INCLUDE.AppKit)
+except ImportError:
+    raise SystemError('Pyobjus not installed. Please run the following'
+        ' command to install it. `pip install --user pyobjus`')
+
+NSPasteboard = autoclass('NSPasteboard')
+NSString = autoclass('NSString')
+
+
+class ClipboardNSPaste(ClipboardBase):
+
+    def __init__(self):
+        super(ClipboardNSPaste, self).__init__()
+        self._clipboard = NSPasteboard.generalPasteboard()
+
+    def get(self, mimetype='text/plain'):
+        pb = self._clipboard
+        return pb.stringForType_('public.utf8-plain-text').UTF8String()
+
+    def put(self, data, mimetype='text/plain'):
+        pb = self._clipboard
+        pb.clearContents()
+        pb.writeObjects_([data])
+
+    def get_types(self):
+        return list('text/plain',)