Swap seekbar vert padding to keep height fixed

Reduce the vertical padding of the seekbar when it's enabled by 2dp to
account for the extra height in the track. That way the height of the
SeekBar view is always 33dp.

This has a nice side effect of properly setting the height of the track
when resuming.

Bug: 160242262
Test: manual
Change-Id: I9b6888f2a6bf5fb118075dea3f849618350ec18b

packages/SystemUI/res/layout/media_view.xml

@@ -166,8 +166,7 @@
         android:layout_height="wrap_content"
         android:clickable="true"
         android:maxHeight="@dimen/qs_media_enabled_seekbar_height"
-        android:paddingTop="16dp"
-        android:paddingBottom="16dp"
+        android:paddingVertical="@dimen/qs_media_enabled_seekbar_vertical_padding"
         android:thumbTint="@color/media_primary_text"
         android:progressTint="@color/media_seekbar_progress"
         android:progressBackgroundTint="@color/media_disabled"

packages/SystemUI/res/values/dimens.xml

@@ -1261,6 +1261,8 @@
     <dimen name="qs_footer_horizontal_margin">22dp</dimen>
     <dimen name="qs_media_disabled_seekbar_height">1dp</dimen>
     <dimen name="qs_media_enabled_seekbar_height">3dp</dimen>
+    <dimen name="qs_media_enabled_seekbar_vertical_padding">15dp</dimen>
+    <dimen name="qs_media_disabled_seekbar_vertical_padding">16dp</dimen>
 
     <!-- Window magnification -->
     <dimen name="magnification_border_drag_size">35dp</dimen>

packages/SystemUI/src/com/android/systemui/media/SeekBarObserver.kt

@@ -28,10 +28,14 @@ import com.android.systemui.R
  */
 class SeekBarObserver(private val holder: PlayerViewHolder) : Observer<SeekBarViewModel.Progress> {
 
-    val seekBarDefaultMaxHeight = holder.seekBar.context.resources
+    val seekBarEnabledMaxHeight = holder.seekBar.context.resources
         .getDimensionPixelSize(R.dimen.qs_media_enabled_seekbar_height)
     val seekBarDisabledHeight = holder.seekBar.context.resources
         .getDimensionPixelSize(R.dimen.qs_media_disabled_seekbar_height)
+    val seekBarEnabledVerticalPadding = holder.seekBar.context.resources
+            .getDimensionPixelSize(R.dimen.qs_media_enabled_seekbar_vertical_padding)
+    val seekBarDisabledVerticalPadding = holder.seekBar.context.resources
+            .getDimensionPixelSize(R.dimen.qs_media_disabled_seekbar_vertical_padding)
 
     /** Updates seek bar views when the data model changes. */
     @UiThread
@@ -39,6 +43,7 @@ class SeekBarObserver(private val holder: PlayerViewHolder) : Observer<SeekBarVi
         if (!data.enabled) {
             if (holder.seekBar.maxHeight != seekBarDisabledHeight) {
                 holder.seekBar.maxHeight = seekBarDisabledHeight
+                setVerticalPadding(seekBarDisabledVerticalPadding)
             }
             holder.seekBar.setEnabled(false)
             holder.seekBar.getThumb().setAlpha(0)
@@ -51,8 +56,9 @@ class SeekBarObserver(private val holder: PlayerViewHolder) : Observer<SeekBarVi
         holder.seekBar.getThumb().setAlpha(if (data.seekAvailable) 255 else 0)
         holder.seekBar.setEnabled(data.seekAvailable)
 
-        if (holder.seekBar.maxHeight != seekBarDefaultMaxHeight) {
-            holder.seekBar.maxHeight = seekBarDefaultMaxHeight
+        if (holder.seekBar.maxHeight != seekBarEnabledMaxHeight) {
+            holder.seekBar.maxHeight = seekBarEnabledMaxHeight
+            setVerticalPadding(seekBarEnabledVerticalPadding)
         }
 
         data.duration?.let {
@@ -67,4 +73,11 @@ class SeekBarObserver(private val holder: PlayerViewHolder) : Observer<SeekBarVi
                     it / DateUtils.SECOND_IN_MILLIS))
         }
     }
+
+    @UiThread
+    fun setVerticalPadding(padding: Int) {
+        val leftPadding = holder.seekBar.paddingLeft
+        val rightPadding = holder.seekBar.paddingRight
+        holder.seekBar.setPadding(leftPadding, padding, rightPadding, padding)
+    }
 }