Add exclusion rect to the BrightnessDialog slider

This prevents drags that are close to the screen from triggering back
gesture. It includes the horizontal margin to give some room for
starting the drag slightly outside of the view.

Fixes: 247049806
Test: manual: small and large screen
Test: atest BrightnessDialogTest
Change-Id: I0a206eda72f6eb15a5d887f01b468a8ceba15d1f

packages/SystemUI/src/com/android/systemui/settings/brightness/BrightnessDialog.java

@@ -20,6 +20,7 @@ import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
 import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
 
 import android.app.Activity;
+import android.graphics.Rect;
 import android.os.Bundle;
 import android.os.Handler;
 import android.view.Gravity;
@@ -36,6 +37,8 @@ import com.android.systemui.R;
 import com.android.systemui.broadcast.BroadcastDispatcher;
 import com.android.systemui.dagger.qualifiers.Background;
 
+import java.util.List;
+
 import javax.inject.Inject;
 
 /** A dialog that provides controls for adjusting the screen brightness. */
@@ -83,6 +86,15 @@ public class BrightnessDialog extends Activity {
         lp.leftMargin = horizontalMargin;
         lp.rightMargin = horizontalMargin;
         frame.setLayoutParams(lp);
+        Rect bounds = new Rect();
+        frame.addOnLayoutChangeListener(
+                (v, left, top, right, bottom, oldLeft, oldTop, oldRight, oldBottom) -> {
+                    // Exclude this view (and its horizontal margins) from triggering gestures.
+                    // This prevents back gesture from being triggered by dragging close to the
+                    // edge of the slider (0% or 100%).
+                    bounds.set(-horizontalMargin, 0, right - left + horizontalMargin, bottom - top);
+                    v.setSystemGestureExclusionRects(List.of(bounds));
+                });
 
         BrightnessSliderController controller = mToggleSliderFactory.create(this, frame);
         controller.init();

packages/SystemUI/tests/AndroidManifest.xml

@@ -88,6 +88,11 @@
                   android:excludeFromRecents="true"
                   />
 
+        <activity android:name=".settings.brightness.BrightnessDialogTest$TestDialog"
+            android:exported="false"
+            android:excludeFromRecents="true"
+            />
+
         <activity android:name="com.android.systemui.screenshot.ScrollViewActivity"
                   android:exported="false" />
 

packages/SystemUI/tests/src/com/android/systemui/settings/brightness/BrightnessDialogTest.kt

@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.settings.brightness
+
+import android.content.Intent
+import android.graphics.Rect
+import android.os.Handler
+import android.testing.AndroidTestingRunner
+import android.testing.TestableLooper
+import android.view.View
+import android.view.ViewGroup
+import androidx.test.filters.SmallTest
+import androidx.test.rule.ActivityTestRule
+import androidx.test.runner.intercepting.SingleActivityFactory
+import com.android.systemui.R
+import com.android.systemui.SysuiTestCase
+import com.android.systemui.broadcast.BroadcastDispatcher
+import com.android.systemui.util.mockito.any
+import com.google.common.truth.Truth.assertThat
+import org.junit.After
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mockito.Mock
+import org.mockito.Mockito.`when`
+import org.mockito.MockitoAnnotations
+
+@SmallTest
+@RunWith(AndroidTestingRunner::class)
+@TestableLooper.RunWithLooper
+class BrightnessDialogTest : SysuiTestCase() {
+
+    @Mock private lateinit var brightnessSliderControllerFactory: BrightnessSliderController.Factory
+    @Mock private lateinit var backgroundHandler: Handler
+    @Mock private lateinit var brightnessSliderController: BrightnessSliderController
+
+    @Rule
+    @JvmField
+    var activityRule =
+        ActivityTestRule(
+            object : SingleActivityFactory<TestDialog>(TestDialog::class.java) {
+                override fun create(intent: Intent?): TestDialog {
+                    return TestDialog(
+                        fakeBroadcastDispatcher,
+                        brightnessSliderControllerFactory,
+                        backgroundHandler
+                    )
+                }
+            },
+            false,
+            false
+        )
+
+    @Before
+    fun setUp() {
+        MockitoAnnotations.initMocks(this)
+        `when`(brightnessSliderControllerFactory.create(any(), any()))
+            .thenReturn(brightnessSliderController)
+        `when`(brightnessSliderController.rootView).thenReturn(View(context))
+
+        activityRule.launchActivity(null)
+    }
+
+    @After
+    fun tearDown() {
+        activityRule.finishActivity()
+    }
+
+    @Test
+    fun testGestureExclusion() {
+        val frame = activityRule.activity.requireViewById<View>(R.id.brightness_mirror_container)
+
+        val lp = frame.layoutParams as ViewGroup.MarginLayoutParams
+        val horizontalMargin =
+            activityRule.activity.resources.getDimensionPixelSize(
+                R.dimen.notification_side_paddings
+            )
+        assertThat(lp.leftMargin).isEqualTo(horizontalMargin)
+        assertThat(lp.rightMargin).isEqualTo(horizontalMargin)
+
+        assertThat(frame.systemGestureExclusionRects.size).isEqualTo(1)
+        val exclusion = frame.systemGestureExclusionRects[0]
+        assertThat(exclusion)
+            .isEqualTo(Rect(-horizontalMargin, 0, frame.width + horizontalMargin, frame.height))
+    }
+
+    class TestDialog(
+        broadcastDispatcher: BroadcastDispatcher,
+        brightnessSliderControllerFactory: BrightnessSliderController.Factory,
+        backgroundHandler: Handler
+    ) : BrightnessDialog(broadcastDispatcher, brightnessSliderControllerFactory, backgroundHandler)
+}