From 08b208586a61c86c9968c4a466f17ce6e842389c Mon Sep 17 00:00:00 2001
From: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
Date: Tue, 12 Apr 2022 11:39:35 +0200
Subject: [PATCH] egui-winit: if clipboard fails to start, fall back to local
 clipboard

---
 egui-winit/src/clipboard.rs | 21 ++++++++-------------
 egui-winit/src/lib.rs       |  7 ++++---
 egui_web/src/lib.rs         | 11 +++++------
 3 files changed, 17 insertions(+), 22 deletions(-)

diff --git a/egui-winit/src/clipboard.rs b/egui-winit/src/clipboard.rs
index 3cfaed70..8737bfd9 100644
--- a/egui-winit/src/clipboard.rs
+++ b/egui-winit/src/clipboard.rs
@@ -1,11 +1,12 @@
-/// Handles interfacing either with the OS clipboard.
-/// If the "clipboard" feature is off it will instead simulate the clipboard locally.
+/// Handles interfacing with the OS clipboard.
+///
+/// If the "clipboard" feature is off, or we cannot connect to the OS clipboard,
+/// then a fallback clipboard that just works works within the same app is used instead.
 pub struct Clipboard {
     #[cfg(feature = "arboard")]
     arboard: Option<arboard::Clipboard>,
 
     /// Fallback manual clipboard.
-    #[cfg(not(feature = "arboard"))]
     clipboard: String,
 }
 
@@ -15,7 +16,6 @@ impl Default for Clipboard {
             #[cfg(feature = "arboard")]
             arboard: init_arboard(),
 
-            #[cfg(not(feature = "arboard"))]
             clipboard: String::default(),
         }
     }
@@ -25,18 +25,15 @@ impl Clipboard {
     pub fn get(&mut self) -> Option<String> {
         #[cfg(feature = "arboard")]
         if let Some(clipboard) = &mut self.arboard {
-            match clipboard.get_text() {
+            return match clipboard.get_text() {
                 Ok(text) => Some(text),
                 Err(err) => {
                     tracing::error!("Paste error: {}", err);
                     None
                 }
-            }
-        } else {
-            None
+            };
         }
 
-        #[cfg(not(feature = "arboard"))]
         Some(self.clipboard.clone())
     }
 
@@ -46,12 +43,10 @@ impl Clipboard {
             if let Err(err) = clipboard.set_text(text) {
                 tracing::error!("Copy/Cut error: {}", err);
             }
+            return;
         }
 
-        #[cfg(not(feature = "arboard"))]
-        {
-            self.clipboard = text;
-        }
+        self.clipboard = text;
     }
 }
 
diff --git a/egui-winit/src/lib.rs b/egui-winit/src/lib.rs
index a43f7121..4a3ec05d 100644
--- a/egui-winit/src/lib.rs
+++ b/egui-winit/src/lib.rs
@@ -412,9 +412,10 @@ impl State {
                     self.egui_input.events.push(egui::Event::Copy);
                 } else if is_paste_command(self.egui_input.modifiers, keycode) {
                     if let Some(contents) = self.clipboard.get() {
-                        self.egui_input
-                            .events
-                            .push(egui::Event::Paste(contents.replace("\r\n", "\n")));
+                        let contents = contents.replace("\r\n", "\n");
+                        if !contents.is_empty() {
+                            self.egui_input.events.push(egui::Event::Paste(contents));
+                        }
                     }
                 }
             }
diff --git a/egui_web/src/lib.rs b/egui_web/src/lib.rs
index 899fde79..cef8ef5a 100644
--- a/egui_web/src/lib.rs
+++ b/egui_web/src/lib.rs
@@ -464,12 +464,11 @@ fn install_document_events(runner_container: &AppRunnerContainer) -> Result<(),
         |event: web_sys::ClipboardEvent, mut runner_lock| {
             if let Some(data) = event.clipboard_data() {
                 if let Ok(text) = data.get_data("text") {
-                    runner_lock
-                        .input
-                        .raw
-                        .events
-                        .push(egui::Event::Paste(text.replace("\r\n", "\n")));
-                    runner_lock.needs_repaint.set_true();
+                    let text = text.replace("\r\n", "\n");
+                    if !text.is_empty() {
+                        runner_lock.input.raw.events.push(egui::Event::Paste(text));
+                        runner_lock.needs_repaint.set_true();
+                    }
                     event.stop_propagation();
                     event.prevent_default();
                 }