From 31f87f647e7cc3391e0f67ddbdb295bb5ea51802 Mon Sep 17 00:00:00 2001
From: Torsten Grote <t@grobox.de>
Date: Fri, 19 Mar 2021 14:27:57 -0300
Subject: [PATCH] Create an OverlayView so we can show taps in espresso tests

---
 .../briar/android/OverlayTapViewAction.java   | 41 +++++++++
 .../briar/android/OverlayView.java            | 83 +++++++++++++++++++
 .../src/screenshotDebug/AndroidManifest.xml   |  3 +
 3 files changed, 127 insertions(+)
 create mode 100644 briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/OverlayTapViewAction.java
 create mode 100644 briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/OverlayView.java

diff --git a/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/OverlayTapViewAction.java b/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/OverlayTapViewAction.java
new file mode 100644
index 000000000..424150f92
--- /dev/null
+++ b/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/OverlayTapViewAction.java
@@ -0,0 +1,41 @@
+package org.briarproject.briar.android;
+
+import android.view.View;
+
+import org.hamcrest.Matcher;
+
+import androidx.test.espresso.UiController;
+import androidx.test.espresso.ViewAction;
+
+import static androidx.test.espresso.action.GeneralLocation.VISIBLE_CENTER;
+import static androidx.test.espresso.matcher.ViewMatchers.isDisplayingAtLeast;
+
+public class OverlayTapViewAction implements ViewAction {
+
+	public static ViewAction visualClick(OverlayView overlayView) {
+		return new OverlayTapViewAction(overlayView);
+	}
+
+	private final OverlayView overlayView;
+
+	public OverlayTapViewAction(OverlayView overlayView) {
+		this.overlayView = overlayView;
+	}
+
+	@Override
+	public Matcher<View> getConstraints() {
+		return isDisplayingAtLeast(90);
+	}
+
+	@Override
+	public String getDescription() {
+		return null;
+	}
+
+	@Override
+	public void perform(UiController uiController, View view) {
+		float[] coordinates = VISIBLE_CENTER.calculateCoordinates(view);
+		overlayView.tap(coordinates);
+	}
+}
+
diff --git a/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/OverlayView.java b/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/OverlayView.java
new file mode 100644
index 000000000..5ba5417e2
--- /dev/null
+++ b/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/OverlayView.java
@@ -0,0 +1,83 @@
+package org.briarproject.briar.android;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.PixelFormat;
+import android.os.Handler;
+import android.view.View;
+import android.view.WindowManager;
+
+import java.util.Random;
+
+import javax.annotation.Nullable;
+
+import static android.content.Context.WINDOW_SERVICE;
+import static android.provider.Settings.canDrawOverlays;
+import static android.view.WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
+import static android.view.WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
+import static androidx.test.core.app.ApplicationProvider.getApplicationContext;
+import static androidx.test.internal.runner.junit4.statement.UiThreadStatement.runOnUiThread;
+import static org.junit.Assert.assertTrue;
+
+public class OverlayView extends View {
+
+	public static OverlayView attach(Context ctx) throws Throwable {
+		assertTrue(canDrawOverlays(ctx));
+		OverlayView view = new OverlayView(getApplicationContext());
+		runOnUiThread(() -> attachInternal(ctx, view));
+		return view;
+	}
+
+	private static void attachInternal(Context ctx, OverlayView view) {
+		WindowManager.LayoutParams params = new WindowManager.LayoutParams(
+				WindowManager.LayoutParams.MATCH_PARENT,
+				WindowManager.LayoutParams.MATCH_PARENT,
+				WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
+				FLAG_NOT_TOUCHABLE | FLAG_NOT_FOCUSABLE,
+				PixelFormat.TRANSLUCENT);
+		WindowManager wm = (WindowManager) ctx.getSystemService(WINDOW_SERVICE);
+		wm.addView(view, params);
+	}
+
+	private final Random random = new Random();
+	private final Paint paint;
+	private final int yOffset;
+	@Nullable
+	private float[] coordinates;
+
+	public OverlayView(Context ctx) {
+		super(ctx);
+		int resourceId = getResources()
+				.getIdentifier("status_bar_height", "dimen", "android");
+		yOffset = getResources().getDimensionPixelSize(resourceId);
+		paint = new Paint();
+		paint.setAntiAlias(true);
+		paint.setARGB(175, 255, 0, 0);
+		setWillNotDraw(false);
+	}
+
+	@Override
+	protected void onLayout(boolean changed, int l, int t, int r, int b) {
+	}
+
+	void tap(float[] coordinates) {
+		this.coordinates = coordinates;
+		invalidate();
+		new Handler().postDelayed(this::untap, 750);
+	}
+
+	private void untap() {
+		this.coordinates = null;
+		invalidate();
+	}
+
+	@Override
+	protected void onDraw(Canvas canvas) {
+		super.onDraw(canvas);
+		if (coordinates == null) return;
+		float x = coordinates[0] + random.nextInt(42);
+		float y = coordinates[1] - yOffset + random.nextInt(13);
+		canvas.drawCircle(x, y, 42, paint);
+	}
+}
diff --git a/briar-android/src/screenshotDebug/AndroidManifest.xml b/briar-android/src/screenshotDebug/AndroidManifest.xml
index d3e565327..376a33b94 100644
--- a/briar-android/src/screenshotDebug/AndroidManifest.xml
+++ b/briar-android/src/screenshotDebug/AndroidManifest.xml
@@ -16,4 +16,7 @@
 	<uses-permission
 		android:name="android.permission.CHANGE_CONFIGURATION"
 		tools:ignore="ProtectedPermissions" />
+
+	<!-- For drawing on top of the app -->
+	<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
 </manifest>