From af9743688075d294ebbd2f0edd6875c45e9cc4ac Mon Sep 17 00:00:00 2001
From: James Montemagno <james.montemagno@gmail.com>
Date: Thu, 5 Nov 2020 19:34:58 -0800
Subject: [PATCH] Add sample for hastext on clip & check IsNullOrEmpty

---
 Samples/Samples/View/ClipboardPage.xaml           | 1 +
 Samples/Samples/ViewModel/ClipboardViewModel.cs   | 8 ++++++++
 Xamarin.Essentials/Clipboard/Clipboard.android.cs | 2 +-
 Xamarin.Essentials/Clipboard/Clipboard.ios.cs     | 2 +-
 Xamarin.Essentials/Clipboard/Clipboard.macos.cs   | 2 +-
 5 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/Samples/Samples/View/ClipboardPage.xaml b/Samples/Samples/View/ClipboardPage.xaml
index b23535a55..3b33c0313 100644
--- a/Samples/Samples/View/ClipboardPage.xaml
+++ b/Samples/Samples/View/ClipboardPage.xaml
@@ -17,6 +17,7 @@
                 <Entry Placeholder="Enter text..." Text="{Binding FieldValue}" />
                 <Button Text="Copy to clipboard" Command="{Binding CopyCommand}" />
                 <Button Text="Paste from clipboard" Command="{Binding PasteCommand}" />
+                <Button Text="Check Status" Command="{Binding CheckCommand}" />
                 <Label Text="{Binding LastCopied}" />
             </StackLayout>
         </ScrollView>
diff --git a/Samples/Samples/ViewModel/ClipboardViewModel.cs b/Samples/Samples/ViewModel/ClipboardViewModel.cs
index 732bb5f92..fc98e31a0 100644
--- a/Samples/Samples/ViewModel/ClipboardViewModel.cs
+++ b/Samples/Samples/ViewModel/ClipboardViewModel.cs
@@ -14,12 +14,15 @@ public ClipboardViewModel()
         {
             CopyCommand = new Command(OnCopy);
             PasteCommand = new Command(OnPaste);
+            CheckCommand = new Command(OnCheck);
         }
 
         public ICommand CopyCommand { get; }
 
         public ICommand PasteCommand { get; }
 
+        public ICommand CheckCommand { get; }
+
         public string FieldValue
         {
             get => fieldValue;
@@ -72,5 +75,10 @@ async void OnPaste()
                 FieldValue = text;
             }
         }
+
+        async void OnCheck()
+        {
+            await DisplayAlertAsync($"Has text: {Clipboard.HasText}");
+        }
     }
 }
diff --git a/Xamarin.Essentials/Clipboard/Clipboard.android.cs b/Xamarin.Essentials/Clipboard/Clipboard.android.cs
index cc3876e83..4a03a18ec 100644
--- a/Xamarin.Essentials/Clipboard/Clipboard.android.cs
+++ b/Xamarin.Essentials/Clipboard/Clipboard.android.cs
@@ -17,7 +17,7 @@ static Task PlatformSetTextAsync(string text)
         }
 
         static bool PlatformHasText
-            => Platform.ClipboardManager.HasPrimaryClip;
+            => Platform.ClipboardManager.HasPrimaryClip && !string.IsNullOrEmpty(Platform.ClipboardManager.PrimaryClip?.GetItemAt(0)?.Text);
 
         static Task<string> PlatformGetTextAsync()
             => Task.FromResult(Platform.ClipboardManager.PrimaryClip?.GetItemAt(0)?.Text);
diff --git a/Xamarin.Essentials/Clipboard/Clipboard.ios.cs b/Xamarin.Essentials/Clipboard/Clipboard.ios.cs
index 5f5ccb86f..d9f597def 100644
--- a/Xamarin.Essentials/Clipboard/Clipboard.ios.cs
+++ b/Xamarin.Essentials/Clipboard/Clipboard.ios.cs
@@ -16,7 +16,7 @@ static Task PlatformSetTextAsync(string text)
         static NSObject observer;
 
         static bool PlatformHasText
-            => UIPasteboard.General.HasStrings;
+            => UIPasteboard.General.HasStrings && !string.IsNullOrEmpty(UIPasteboard.General.String);
 
         static Task<string> PlatformGetTextAsync()
             => Task.FromResult(UIPasteboard.General.String);
diff --git a/Xamarin.Essentials/Clipboard/Clipboard.macos.cs b/Xamarin.Essentials/Clipboard/Clipboard.macos.cs
index 3519862c2..7e8b47a3e 100644
--- a/Xamarin.Essentials/Clipboard/Clipboard.macos.cs
+++ b/Xamarin.Essentials/Clipboard/Clipboard.macos.cs
@@ -22,7 +22,7 @@ static Task PlatformSetTextAsync(string text)
         }
 
         static bool PlatformHasText =>
-            GetPasteboardText() != null;
+            !string.IsNullOrEmpty(GetPasteboardText());
 
         static Task<string> PlatformGetTextAsync()
             => Task.FromResult(GetPasteboardText());