Add clipboard functionality to platform plugin (#3139)

This will eventually replace the clipboard mojom.

shell/platform/android/io/flutter/plugin/platform/PlatformPlugin.java

@@ -5,6 +5,10 @@
 package io.flutter.plugin.platform;
 
 import android.app.Activity;
+import android.content.ClipboardManager;
+import android.content.ClipData;
+import android.content.ClipDescription;
+import android.content.Context;
 import android.content.Intent;
 import android.content.pm.ActivityInfo;
 import android.net.Uri;
@@ -27,6 +31,7 @@ public class PlatformPlugin extends JSONMessageListener implements ActivityLifec
     private final Activity mActivity;
     public static final int DEFAULT_SYSTEM_UI = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
             | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
+    private static final String kTextPlainFormat = "text/plain";
 
     public PlatformPlugin(Activity activity) {
         mActivity = activity;
@@ -53,6 +58,10 @@ public class PlatformPlugin extends JSONMessageListener implements ActivityLifec
             setSystemChromeSystemUIOverlayStyle(args.getString(0));
         } else if (method.equals("SystemNavigator.pop")) {
             popSystemNavigator();
+        } else if (method.equals("Clipboard.getData")) {
+            return getClipboardData(args.getString(0));
+        } else if (method.equals("Clipboard.setData")) {
+            setClipboardData(args.getJSONObject(0));
         } else if (method.equals("PathProvider.getTemporaryDirectory")) {
             return getPathProviderTemporaryDirectory();
         } else if (method.equals("PathProvider.getApplicationDocumentsDirectory")) {
@@ -166,6 +175,28 @@ public class PlatformPlugin extends JSONMessageListener implements ActivityLifec
         mActivity.finish();
     }
 
+    private JSONObject getClipboardData(String format) throws JSONException {
+        ClipboardManager clipboard = (ClipboardManager) mActivity.getSystemService(Context.CLIPBOARD_SERVICE);
+        ClipData clip = clipboard.getPrimaryClip();
+        if (clip == null)
+            return null;
+
+        if ((format == null || format.equals(kTextPlainFormat)) &&
+            clip.getDescription().hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN)) {
+              JSONObject result = new JSONObject();
+              result.put("text", clip.getItemAt(0).getText().toString());
+              return result;
+        }
+
+        return null;
+    }
+
+    private void setClipboardData(JSONObject data) throws JSONException {
+        ClipboardManager clipboard = (ClipboardManager) mActivity.getSystemService(Context.CLIPBOARD_SERVICE);
+        ClipData clip = ClipData.newPlainText("text label?", data.getString("text"));
+        clipboard.setPrimaryClip(clip);
+    }
+
     private JSONObject getPathProviderTemporaryDirectory() throws JSONException {
         JSONObject result = new JSONObject();
         result.put("path", mActivity.getCacheDir().getPath());

shell/platform/darwin/ios/framework/Source/FlutterPlatformPlugin.mm

@@ -9,7 +9,11 @@
 #include <UIKit/UIApplication.h>
 #include <UIKit/UIKit.h>
 
-static NSDictionary* GetDirectoryOfType(NSSearchPathDirectory dir) {
+namespace {
+
+constexpr char kTextPlainFormat[] = "text/plain";
+
+NSDictionary* GetDirectoryOfType(NSSearchPathDirectory dir) {
   NSArray* paths =
       NSSearchPathForDirectoriesInDomains(dir, NSUserDomainMask, YES);
   if (paths.count == 0)
@@ -17,6 +21,8 @@ static NSDictionary* GetDirectoryOfType(NSSearchPathDirectory dir) {
   return @{ @"path": paths.firstObject };
 }
 
+}  // namespaces
+
 namespace shell {
 
 // TODO(abarth): Move these definitions from system_chrome_impl.cc to here.
@@ -58,6 +64,10 @@ using namespace shell;
     [self setSystemChromeSystemUIOverlayStyle:args.firstObject];
   } else if ([method isEqualToString:@"SystemNavigator.pop"]) {
     [self popSystemNavigator];
+  } else if ([method isEqualToString:@"Clipboard.getData"]) {
+    return [self getClipboardData:args.firstObject];
+  } else if ([method isEqualToString:@"Clipboard.setData"]) {
+    [self setClipboardData:args.firstObject];
   } else if ([method isEqualToString:@"PathProvider.getTemporaryDirectory"]) {
     return [self getPathProviderTemporaryDirectory];
   } else if ([method isEqualToString:@"PathProvider.getApplicationDocumentsDirectory"]) {
@@ -166,6 +176,18 @@ using namespace shell;
   // Apple's human user guidelines say not to terminate iOS applications.
 }
 
+- (NSDictionary*)getClipboardData:(NSString*)format {
+  UIPasteboard* pasteboard = [UIPasteboard generalPasteboard];
+  if (!format || [format isEqualToString:@(kTextPlainFormat)])
+    return @{ @"text": pasteboard.string };
+  return nil;
+}
+
+- (void)setClipboardData:(NSDictionary *)data {
+  UIPasteboard* pasteboard = [UIPasteboard generalPasteboard];
+  pasteboard.string = data[@"text"];
+}
+
 - (NSDictionary*)getPathProviderTemporaryDirectory {
   return GetDirectoryOfType(NSCachesDirectory);
 }