Change the status bar clock's measuring scheme (649b5041) · Commits · e / os / android_frameworks_base

packages/SystemUI/src/com/android/systemui/statusbar/policy/Clock.java

+30 −0

Original line number	Diff line number	Diff line
		@@ -103,6 +103,10 @@ public class Clock extends TextView implements
		private boolean mShowSeconds;
		private Handler mSecondsHandler;

		// Fields to cache the width so the clock remains at an approximately constant width
		private int mCharsAtCurrentWidth = -1;
		private int mCachedWidth = -1;

		/**
		* Color to be set on this {@link TextView}, when wallpaperTextColor is <b>not</b> utilized.
		*/
		@@ -302,6 +306,32 @@ public class Clock extends TextView implements
		setContentDescription(mContentDescriptionFormat.format(mCalendar.getTime()));
		}

		/**
		* In order to avoid the clock growing and shrinking due to proportional fonts, we want to
		* cache the drawn width at a given number of characters (removing the cache when it changes),
		* and only use the biggest value. This means that the clock width with grow to the maximum
		* size over time, but reset whenever the number of characters changes (or the configuration
		* changes)
		*/
		@Override
		protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		super.onMeasure(widthMeasureSpec, heightMeasureSpec);

		int chars = getText().length();
		if (chars != mCharsAtCurrentWidth) {
		mCharsAtCurrentWidth = chars;
		mCachedWidth = getMeasuredWidth();
		return;
		}

		int measuredWidth = getMeasuredWidth();
		if (mCachedWidth > measuredWidth) {
		setMeasuredDimension(mCachedWidth, getMeasuredHeight());
		} else {
		mCachedWidth = measuredWidth;
		}
		}

		@Override
		public void onTuningChanged(String key, String newValue) {
		if (CLOCK_SECONDS.equals(key)) {

packages/SystemUI/tests/src/com/android/systemui/statusbar/policy/ClockTest.kt

0 → 100644

+130 −0

Original line number	Diff line number	Diff line
		/*
		* 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.statusbar.policy

		import android.testing.AndroidTestingRunner
		import android.testing.TestableLooper
		import android.view.View.MeasureSpec.UNSPECIFIED
		import android.view.View.MeasureSpec.makeMeasureSpec
		import android.view.ViewGroup.LayoutParams.WRAP_CONTENT
		import android.widget.LinearLayout
		import androidx.test.filters.SmallTest
		import com.android.systemui.SysuiTestCase
		import org.junit.Before
		import org.junit.runner.RunWith

		import com.google.common.truth.Truth.assertThat
		import org.junit.Test

		@SmallTest
		@RunWith(AndroidTestingRunner::class)
		@TestableLooper.RunWithLooper
		class ClockTest : SysuiTestCase() {
		private lateinit var clockView: Clock

		@Before
		fun setUp() {
		allowTestableLooperAsMainThread()
		TestableLooper.get(this).runWithLooper {
		val container = LinearLayout(context)
		val lp = LinearLayout.LayoutParams(1000, WRAP_CONTENT)
		container.layoutParams = lp
		clockView = Clock(context, null)
		container.addView(clockView)
		measureClock()
		}
		}

		@Test
		fun testWidthDoesNotDecrease_sameCharLength() {
		// GIVEN time is narrow
		clockView.text = ONE_3
		measureClock()
		val width1 = clockView.measuredWidth

		// WHEN the text changes to be wider characters
		clockView.text = ZERO_3
		measureClock()
		val width2 = clockView.measuredWidth

		// THEN the width should be wider (or equals when using monospace font)
		assertThat(width2).isAtLeast(width1)
		}

		@Test
		fun testWidthDoesNotDecrease_narrowerFont_sameNumberOfChars() {
		// GIVEN time is wide
		clockView.text = ZERO_3
		measureClock()
		val width1 = clockView.measuredWidth

		// WHEN the text changes to a narrower font
		clockView.text = ONE_3
		measureClock()
		val width2 = clockView.measuredWidth

		// THEN the width should not have decreased, and they should in fact be the same
		assertThat(width2).isEqualTo(width1)
		}

		@Test
		fun testWidthIncreases_whenCharsChanges() {
		// GIVEN wide 3-char text
		clockView.text = ZERO_3
		measureClock()
		val width1 = clockView.measuredWidth

		// WHEN text changes to 4-char wide text
		clockView.text = ZERO_4
		measureClock()
		val width2 = clockView.measuredWidth

		// THEN the text field is wider
		assertThat(width2).isGreaterThan(width1)
		}

		@Test
		fun testWidthDecreases_whenCharsChange_longToShort() {
		// GIVEN wide 4-char text
		clockView.text = ZERO_4
		measureClock()
		val width1 = clockView.measuredWidth

		// WHEN number of characters changes to a narrow 3-char text
		clockView.text = ONE_3
		measureClock()
		val width2 = clockView.measuredWidth

		// THEN the width can shrink, because number of chars changed
		assertThat(width2).isLessThan(width1)
		}

		private fun measureClock() {
		clockView.measure(
		makeMeasureSpec(0, UNSPECIFIED),
		makeMeasureSpec(0, UNSPECIFIED)
		)
		}
		}

		/**
		* In a non-monospace font, it is expected that "0:00" is wider than "1:11"
		*/
		private const val ZERO_3 = "0:00"
		private const val ZERO_4 = "00:00"
		private const val ONE_3 = "1:11"
		private const val ONE_4 = "11:11"