core: Add clipboard_content getter

Author: JMcKiern

core/src/backend/input.rs

@@ -17,6 +17,9 @@ pub trait InputBackend: Downcast {
     /// Changes the mouse cursor image.
     fn set_mouse_cursor(&mut self, cursor: MouseCursor);
 
+    /// Get the clipboard content
+    fn clipboard_content(&mut self) -> String;
+
     /// Set the clipboard to the given content
     fn set_clipboard_content(&mut self, content: String);
 }
@@ -54,6 +57,10 @@ impl InputBackend for NullInputBackend {
 
     fn set_mouse_cursor(&mut self, _cursor: MouseCursor) {}
 
+    fn clipboard_content(&mut self) -> String {
+        "".to_string()
+    }
+
     fn set_clipboard_content(&mut self, _content: String) {}
 }
 

desktop/src/input.rs

@@ -212,6 +212,12 @@ impl InputBackend for WinitInputBackend {
         self.window.set_cursor_icon(icon);
     }
 
+    fn clipboard_content(&mut self) -> String {
+        self.clipboard
+            .get_contents()
+            .unwrap_or_else(|_| "".to_string())
+    }
+
     fn set_clipboard_content(&mut self, content: String) {
         self.clipboard.set_contents(content).unwrap();
     }

web/src/input.rs

@@ -195,6 +195,11 @@ impl InputBackend for WebInputBackend {
         self.update_mouse_cursor();
     }
 
+    fn clipboard_content(&mut self) -> String {
+        log::warn!("get clipboard not implemented");
+        "".to_string()
+    }
+
     fn set_clipboard_content(&mut self, _content: String) {
         log::warn!("set clipboard not implemented");
     }