feat(core): add clipboard writeText and readText APIs (#2035)

examples/api/src/App.svelte

@@ -16,6 +16,7 @@
   import Shortcuts from "./components/Shortcuts.svelte";
   import Shell from "./components/Shell.svelte";
   import Updater from "./components/Updater.svelte";
+  import Clipboard from "./components/Clipboard.svelte";
 
   const MENU_TOGGLE_HOTKEY = 'ctrl+b';
 
@@ -69,7 +70,11 @@
     {
       label: "Updater",
       component: Updater,
-    },    
+    },
+    {
+      label: "Clipboard",
+      component: Clipboard,
+    }
   ];
 
   let selected = views[0];

examples/api/src/components/Clipboard.svelte

@@ -0,0 +1,36 @@
+<script>
+  import {
+    writeText,
+    readText
+  } from "@tauri-apps/api/clipboard";
+
+  export let onMessage;
+  let text = "clipboard message";
+
+  function write() {
+    writeText(text)
+      .then(() => {
+        onMessage('Wrote to the clipboard');
+      })
+      .catch(onMessage);
+  }
+
+  function read() {
+    readText()
+      .then((contents) => {
+        onMessage(`Clipboard contents: ${contents}`);
+      })
+      .catch(onMessage);
+  }
+</script>
+
+<div>
+  <div>
+    <input
+      placeholder="Text to write to the clipboard"
+      bind:value={text}
+    />
+    <button type="button" on:click={write}>Write</button>
+  </div>
+  <button type="button" on:click={read}>Read</button>
+</div>