Implement Font Scaling Quick Settings Tile (4/n)

Setup the dialog panel for font scaling
 - Slider: The number of steps in the slider refers to the values
   options for font scaling. Changing the progress of the seekbar will
   change the size of fonts including the ones on the dialog panel.
 - Title and Done button: Update font size when onConfigurationChanged.

Bug: 242326166
Test: Attach a video to the bug
Test: atest FontScalingDialogTest
Change-Id: I9004aa933ff1d8021f3087a015ebc23bb8724871

5 files changed, 193 insertions, 4 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/accessibility/fontscaling/FontScalingDialog.kt b/packages/SystemUI/src/com/android/systemui/accessibility/fontscaling/FontScalingDialog.kt
index f521839be50b..54f933ae6d09 100644
--- a/packages/SystemUI/src/com/android/systemui/accessibility/fontscaling/FontScalingDialog.kt
+++ b/packages/SystemUI/src/com/android/systemui/accessibility/fontscaling/FontScalingDialog.kt
@@ -16,13 +16,32 @@
 package com.android.systemui.accessibility.fontscaling
 
 import android.content.Context
+import android.content.pm.ActivityInfo
+import android.content.res.Configuration
 import android.os.Bundle
+import android.provider.Settings
 import android.view.LayoutInflater
+import android.widget.Button
+import android.widget.SeekBar
+import android.widget.SeekBar.OnSeekBarChangeListener
+import android.widget.TextView
 import com.android.systemui.R
+import com.android.systemui.common.ui.view.SeekBarWithIconButtonsView
 import com.android.systemui.statusbar.phone.SystemUIDialog
+import com.android.systemui.util.settings.SystemSettings
 
 /** The Dialog that contains a seekbar for changing the font size. */
-class FontScalingDialog(context: Context) : SystemUIDialog(context) {
+class FontScalingDialog(context: Context, private val systemSettings: SystemSettings) :
+    SystemUIDialog(context) {
+    private val strEntryValues: Array<String> =
+        context.resources.getStringArray(com.android.settingslib.R.array.entryvalues_font_size)
+    private lateinit var title: TextView
+    private lateinit var doneButton: Button
+    private lateinit var seekBarWithIconButtonsView: SeekBarWithIconButtonsView
+
+    private val configuration: Configuration =
+        Configuration(context.getResources().getConfiguration())
+
     override fun onCreate(savedInstanceState: Bundle?) {
         setTitle(R.string.font_scaling_dialog_title)
         setView(LayoutInflater.from(context).inflate(R.layout.font_scaling_dialog, null))
@@ -32,5 +51,57 @@ class FontScalingDialog(context: Context) : SystemUIDialog(context) {
             /* dismissOnClick = */ true
         )
         super.onCreate(savedInstanceState)
+
+        title = requireViewById(com.android.internal.R.id.alertTitle)
+        doneButton = requireViewById(com.android.internal.R.id.button1)
+        seekBarWithIconButtonsView = requireViewById(R.id.font_scaling_slider)
+
+        seekBarWithIconButtonsView.setMax((strEntryValues).size - 1)
+
+        val currentScale = systemSettings.getFloat(Settings.System.FONT_SCALE, 1.0f)
+        seekBarWithIconButtonsView.setProgress(fontSizeValueToIndex(currentScale))
+
+        seekBarWithIconButtonsView.setOnSeekBarChangeListener(
+            object : OnSeekBarChangeListener {
+                override fun onProgressChanged(seekBar: SeekBar, progress: Int, fromUser: Boolean) {
+                    systemSettings.putString(Settings.System.FONT_SCALE, strEntryValues[progress])
+                }
+
+                override fun onStartTrackingTouch(seekBar: SeekBar) {
+                    // Do nothing
+                }
+
+                override fun onStopTrackingTouch(seekBar: SeekBar) {
+                    // Do nothing
+                }
+            }
+        )
+        doneButton.setOnClickListener { dismiss() }
+    }
+
+    private fun fontSizeValueToIndex(value: Float): Int {
+        var lastValue = strEntryValues[0].toFloat()
+        for (i in 1 until strEntryValues.size) {
+            val thisValue = strEntryValues[i].toFloat()
+            if (value < lastValue + (thisValue - lastValue) * .5f) {
+                return i - 1
+            }
+            lastValue = thisValue
+        }
+        return strEntryValues.size - 1
+    }
+
+    override fun onConfigurationChanged(configuration: Configuration) {
+        super.onConfigurationChanged(configuration)
+
+        val configDiff = configuration.diff(this.configuration)
+        this.configuration.setTo(configuration)
+
+        if (configDiff and ActivityInfo.CONFIG_FONT_SCALE != 0) {
+            title.post {
+                title.setTextAppearance(R.style.TextAppearance_Dialog_Title)
+                doneButton.setTextAppearance(R.style.Widget_Dialog_Button)
+            }
+        }
     }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/common/ui/view/SeekBarWithIconButtonsView.java b/packages/SystemUI/src/com/android/systemui/common/ui/view/SeekBarWithIconButtonsView.java
index e8288a0d2a87..826253947ce1 100644
--- a/packages/SystemUI/src/com/android/systemui/common/ui/view/SeekBarWithIconButtonsView.java
+++ b/packages/SystemUI/src/com/android/systemui/common/ui/view/SeekBarWithIconButtonsView.java
@@ -153,6 +153,13 @@ public class SeekBarWithIconButtonsView extends LinearLayout {
     }
 
     /**
+     * Sets max to the seekbar in the layout.
+     */
+    public void setMax(int max) {
+        mSeekbar.setMax(max);
+    }
+
+    /**
      * Sets progress to the seekbar in the layout.
      * If the progress is smaller than or equals to 0, the IconStart will be disabled. If the
      * progress is larger than or equals to Max, the IconEnd will be disabled. The seekbar progress
diff --git a/packages/SystemUI/src/com/android/systemui/qs/tiles/FontScalingTile.kt b/packages/SystemUI/src/com/android/systemui/qs/tiles/FontScalingTile.kt
index ce5e4055e840..b9cd535b9765 100644
--- a/packages/SystemUI/src/com/android/systemui/qs/tiles/FontScalingTile.kt
+++ b/packages/SystemUI/src/com/android/systemui/qs/tiles/FontScalingTile.kt
@@ -35,6 +35,7 @@ import com.android.systemui.qs.QSHost
 import com.android.systemui.qs.logging.QSLogger
 import com.android.systemui.qs.tileimpl.QSTileImpl
 import com.android.systemui.statusbar.phone.SystemUIDialog
+import com.android.systemui.util.settings.SystemSettings
 import javax.inject.Inject
 
 class FontScalingTile
@@ -48,7 +49,8 @@ constructor(
     statusBarStateController: StatusBarStateController,
     activityStarter: ActivityStarter,
     qsLogger: QSLogger,
-    private val dialogLaunchAnimator: DialogLaunchAnimator
+    private val dialogLaunchAnimator: DialogLaunchAnimator,
+    private val systemSettings: SystemSettings
 ) :
     QSTileImpl<QSTile.State?>(
         host,
@@ -74,7 +76,7 @@ constructor(
 
     override fun handleClick(view: View?) {
         mUiHandler.post {
-            val dialog: SystemUIDialog = FontScalingDialog(mContext)
+            val dialog: SystemUIDialog = FontScalingDialog(mContext, systemSettings)
             if (view != null) {
                 dialogLaunchAnimator.showFromView(
                     dialog,
diff --git a/packages/SystemUI/tests/src/com/android/systemui/accessibility/fontscaling/FontScalingDialogTest.kt b/packages/SystemUI/tests/src/com/android/systemui/accessibility/fontscaling/FontScalingDialogTest.kt
new file mode 100644
index 000000000000..777dd4e0b4a3
--- /dev/null
+++ b/packages/SystemUI/tests/src/com/android/systemui/accessibility/fontscaling/FontScalingDialogTest.kt
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2023 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.accessibility.fontscaling
+
+import android.os.Handler
+import android.provider.Settings
+import android.testing.AndroidTestingRunner
+import android.testing.TestableLooper
+import android.widget.ImageView
+import android.widget.SeekBar
+import androidx.test.filters.SmallTest
+import com.android.systemui.R
+import com.android.systemui.SysuiTestCase
+import com.android.systemui.common.ui.view.SeekBarWithIconButtonsView
+import com.android.systemui.util.settings.FakeSettings
+import com.android.systemui.util.settings.SystemSettings
+import com.google.common.truth.Truth.assertThat
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+/** Tests for [FontScalingDialog]. */
+@SmallTest
+@RunWith(AndroidTestingRunner::class)
+@TestableLooper.RunWithLooper(setAsMainLooper = true)
+class FontScalingDialogTest : SysuiTestCase() {
+    private lateinit var fontScalingDialog: FontScalingDialog
+    private lateinit var systemSettings: SystemSettings
+    private val fontSizeValueArray: Array<String> =
+        mContext
+            .getResources()
+            .getStringArray(com.android.settingslib.R.array.entryvalues_font_size)
+
+    @Before
+    fun setUp() {
+        val mainHandler = Handler(TestableLooper.get(this).getLooper())
+        systemSettings = FakeSettings()
+        fontScalingDialog = FontScalingDialog(mContext, systemSettings as FakeSettings)
+    }
+
+    @Test
+    fun showTheDialog_seekbarIsShowingCorrectProgress() {
+        fontScalingDialog.show()
+
+        val seekBar: SeekBar = fontScalingDialog.findViewById<SeekBar>(R.id.seekbar)!!
+        val progress: Int = seekBar.getProgress()
+        val currentScale = systemSettings.getFloat(Settings.System.FONT_SCALE, /* def = */ 1.0f)
+
+        assertThat(currentScale).isEqualTo(fontSizeValueArray[progress].toFloat())
+
+        fontScalingDialog.dismiss()
+    }
+
+    @Test
+    fun progressIsZero_clickIconEnd_seekBarProgressIncreaseOne_fontSizeScaled() {
+        fontScalingDialog.show()
+
+        val iconEnd: ImageView = fontScalingDialog.findViewById(R.id.icon_end)!!
+        val seekBarWithIconButtonsView: SeekBarWithIconButtonsView =
+            fontScalingDialog.findViewById(R.id.font_scaling_slider)!!
+        val seekBar: SeekBar = fontScalingDialog.findViewById(R.id.seekbar)!!
+
+        seekBarWithIconButtonsView.setProgress(0)
+
+        iconEnd.performClick()
+
+        val currentScale = systemSettings.getFloat(Settings.System.FONT_SCALE, /* def = */ 1.0f)
+        assertThat(seekBar.getProgress()).isEqualTo(1)
+        assertThat(currentScale).isEqualTo(fontSizeValueArray[1].toFloat())
+
+        fontScalingDialog.dismiss()
+    }
+
+    @Test
+    fun progressIsMax_clickIconStart_seekBarProgressDecreaseOne_fontSizeScaled() {
+        fontScalingDialog.show()
+
+        val iconStart: ImageView = fontScalingDialog.findViewById(R.id.icon_start)!!
+        val seekBarWithIconButtonsView: SeekBarWithIconButtonsView =
+            fontScalingDialog.findViewById(R.id.font_scaling_slider)!!
+        val seekBar: SeekBar = fontScalingDialog.findViewById(R.id.seekbar)!!
+
+        seekBarWithIconButtonsView.setProgress(fontSizeValueArray.size - 1)
+
+        iconStart.performClick()
+
+        val currentScale = systemSettings.getFloat(Settings.System.FONT_SCALE, /* def = */ 1.0f)
+        assertThat(seekBar.getProgress()).isEqualTo(fontSizeValueArray.size - 2)
+        assertThat(currentScale)
+            .isEqualTo(fontSizeValueArray[fontSizeValueArray.size - 2].toFloat())
+
+        fontScalingDialog.dismiss()
+    }
+}
diff --git a/packages/SystemUI/tests/src/com/android/systemui/qs/tiles/dialog/FontScalingTileTest.kt b/packages/SystemUI/tests/src/com/android/systemui/qs/tiles/dialog/FontScalingTileTest.kt
index f97ccab5fc1f..57abae0889ca 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/qs/tiles/dialog/FontScalingTileTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/qs/tiles/dialog/FontScalingTileTest.kt
@@ -28,6 +28,7 @@ import com.android.systemui.plugins.statusbar.StatusBarStateController
 import com.android.systemui.qs.QSTileHost
 import com.android.systemui.qs.logging.QSLogger
 import com.android.systemui.qs.tiles.FontScalingTile
+import com.android.systemui.util.settings.FakeSettings
 import com.google.common.truth.Truth.assertThat
 import org.junit.Before
 import org.junit.Test
@@ -65,7 +66,8 @@ class FontScalingTileTest : SysuiTestCase() {
                 statusBarStateController,
                 activityStarter,
                 qsLogger,
-                dialogLaunchAnimator
+                dialogLaunchAnimator,
+                FakeSettings()
             )
         fontScalingTile.initialize()
     }