app/internal/wm: rename confusing app/internal/window

Package wm (for "window manager") is a better fit for the package, and
distinguishes it from the low-level package windows for the Windows API.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/internal/wm/Gio.java

@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package org.gioui;
+
+import android.content.ClipboardManager;
+import android.content.ClipData;
+import android.content.Context;
+import android.os.Handler;
+import android.os.Looper;
+
+import java.io.UnsupportedEncodingException;
+
+public final class Gio {
+	private static final Object initLock = new Object();
+	private static boolean jniLoaded;
+	private static final Handler handler = new Handler(Looper.getMainLooper());
+
+	/**
+	 * init loads and initializes the Go native library and runs
+	 * the Go main function.
+	 *
+	 * It is exported for use by Android apps that need to run Go code
+	 * outside the lifecycle of the Gio activity.
+	 */
+	public static synchronized void init(Context appCtx) {
+		synchronized (initLock) {
+			if (jniLoaded) {
+				return;
+			}
+			String dataDir = appCtx.getFilesDir().getAbsolutePath();
+			byte[] dataDirUTF8;
+			try {
+				dataDirUTF8 = dataDir.getBytes("UTF-8");
+			} catch (UnsupportedEncodingException e) {
+				throw new RuntimeException(e);
+			}
+			System.loadLibrary("gio");
+			runGoMain(dataDirUTF8, appCtx);
+			jniLoaded = true;
+		}
+	}
+
+	static private native void runGoMain(byte[] dataDir, Context context);
+
+	static void writeClipboard(Context ctx, String s) {
+		ClipboardManager m = (ClipboardManager)ctx.getSystemService(Context.CLIPBOARD_SERVICE);
+		m.setPrimaryClip(ClipData.newPlainText(null, s));
+	}
+
+	static String readClipboard(Context ctx) {
+		ClipboardManager m = (ClipboardManager)ctx.getSystemService(Context.CLIPBOARD_SERVICE);
+		ClipData c = m.getPrimaryClip();
+		if (c == null || c.getItemCount() < 1) {
+			return null;
+		}
+		return c.getItemAt(0).coerceToText(ctx).toString();
+	}
+
+	static void wakeupMainThread() {
+		handler.post(new Runnable() {
+			@Override public void run() {
+				scheduleMainFuncs();
+			}
+		});
+	}
+
+	static private native void scheduleMainFuncs();
+}