Align taskbar to the left/right in 3 button nav for certain devices.

Otherwise we position the taskbar in the center.

Bug: 259712417
Fixes: 267997547
Test: transient taskbar unaffected
      persistent taskbar
      - test on small tablet
      - test on large tablet
      - test LTR and RTL

Change-Id: Ieb0a304d9963ebf583bc4ef2deaab747019e8d6d
diff --git a/quickstep/res/values-sw600dp/config.xml b/quickstep/res/values-sw600dp/config.xml
new file mode 100644
index 0000000..e1e442f
--- /dev/null
+++ b/quickstep/res/values-sw600dp/config.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 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.
+-->
+<!-- Applies to large tablet screens portrait -->
+<resources>
+    <!-- Taskbar -->
+    <!-- Align the Taskbar to the start (Left/Right) of the device when 3 button nav is enabled. -->
+    <bool name="start_align_taskbar">true</bool>
+</resources>
\ No newline at end of file
diff --git a/quickstep/res/values-sw720dp-land/config.xml b/quickstep/res/values-sw720dp-land/config.xml
new file mode 100644
index 0000000..bf0f9ad
--- /dev/null
+++ b/quickstep/res/values-sw720dp-land/config.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 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.
+-->
+<!-- Applies to large tablet screens landscape -->
+<resources>
+    <!-- Taskbar -->
+    <!-- Align the Taskbar to the start (Left/Right) of the device when 3 button nav is enabled. -->
+    <bool name="start_align_taskbar">false</bool>
+</resources>
\ No newline at end of file
diff --git a/quickstep/res/values-sw720dp/config.xml b/quickstep/res/values-sw720dp/config.xml
new file mode 100644
index 0000000..e1e442f
--- /dev/null
+++ b/quickstep/res/values-sw720dp/config.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 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.
+-->
+<!-- Applies to large tablet screens portrait -->
+<resources>
+    <!-- Taskbar -->
+    <!-- Align the Taskbar to the start (Left/Right) of the device when 3 button nav is enabled. -->
+    <bool name="start_align_taskbar">true</bool>
+</resources>
\ No newline at end of file
diff --git a/quickstep/res/values/config.xml b/quickstep/res/values/config.xml
index d581582..b61bdfb 100644
--- a/quickstep/res/values/config.xml
+++ b/quickstep/res/values/config.xml
@@ -51,4 +51,8 @@
     </item>
 
     <string name="setup_wizard_pkg" translatable="false" />
+
+    <!-- Taskbar -->
+    <!-- Align the Taskbar to the start (Left/Right) of the device when 3 button nav is enabled. -->
+    <bool name="start_align_taskbar">false</bool>
 </resources>
diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java b/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java
index 3d5089f..7ff988c 100644
--- a/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java
@@ -91,6 +91,8 @@
 
     private float mTransientTaskbarAllAppsButtonTranslationXOffset;
 
+    private final boolean mStartAlignTaskbar;
+
     public TaskbarView(@NonNull Context context) {
         this(context, null);
     }
@@ -118,6 +120,8 @@
                 resources.getDimension(isTransientTaskbar
                         ? R.dimen.transient_taskbar_all_apps_button_translation_x_offset
                         : R.dimen.taskbar_all_apps_button_translation_x_offset);
+        mStartAlignTaskbar = mActivityContext.isThreeButtonNav()
+                && resources.getBoolean(R.bool.start_align_taskbar);
 
         int actualMargin = resources.getDimensionPixelSize(R.dimen.taskbar_icon_spacing);
         int actualIconSize = mActivityContext.getDeviceProfile().iconSizePx;
@@ -343,10 +347,22 @@
         boolean needMoreSpaceForNav = layoutRtl ?
                 navSpaceNeeded > (iconEnd - spaceNeeded) :
                 iconEnd > (right - navSpaceNeeded);
-        if (needMoreSpaceForNav) {
-            int offset = layoutRtl ?
-                    navSpaceNeeded - (iconEnd - spaceNeeded) :
-                    (right - navSpaceNeeded) - iconEnd;
+
+        if (mStartAlignTaskbar) {
+            // Taskbar is aligned to the start
+            int startSpacingPx = deviceProfile.inlineNavButtonsEndSpacingPx;
+
+            if (layoutRtl) {
+                iconEnd = right - startSpacingPx;
+            } else {
+                iconEnd = startSpacingPx + spaceNeeded;
+            }
+        } else if (needMoreSpaceForNav) {
+            // Add offset to account for nav bar when taskbar is centered
+            int offset = layoutRtl
+                    ? navSpaceNeeded - (iconEnd - spaceNeeded)
+                    : (right - navSpaceNeeded) - iconEnd;
+
             iconEnd += offset;
         }
 
diff --git a/src/com/android/launcher3/DeviceProfile.java b/src/com/android/launcher3/DeviceProfile.java
index 87ee4f6..d992ee0 100644
--- a/src/com/android/launcher3/DeviceProfile.java
+++ b/src/com/android/launcher3/DeviceProfile.java
@@ -193,7 +193,7 @@
     private final int mMinHotseatIconSpacePx;
     private final int mMinHotseatQsbWidthPx;
     private final int mMaxHotseatIconSpacePx;
-    private final int mInlineNavButtonsEndSpacingPx;
+    public final int inlineNavButtonsEndSpacingPx;
 
     // Bottom sheets
     public int bottomSheetTopPadding;
@@ -490,7 +490,7 @@
         hotseatBarSidePaddingStartPx = isVerticalBarLayout() ? workspacePageIndicatorHeight : 0;
         updateHotseatSizes(pxFromDp(inv.iconSize[INDEX_DEFAULT], mMetrics));
         if (areNavButtonsInline && !isPhone) {
-            mInlineNavButtonsEndSpacingPx =
+            inlineNavButtonsEndSpacingPx =
                     res.getDimensionPixelSize(inv.inlineNavButtonsEndSpacing);
             /*
              * 3 nav buttons +
@@ -499,9 +499,9 @@
              */
             hotseatBarEndOffset = 3 * res.getDimensionPixelSize(R.dimen.taskbar_nav_buttons_size)
                     + 2 * res.getDimensionPixelSize(R.dimen.taskbar_button_space_inbetween)
-                    + mInlineNavButtonsEndSpacingPx;
+                    + inlineNavButtonsEndSpacingPx;
         } else {
-            mInlineNavButtonsEndSpacingPx = 0;
+            inlineNavButtonsEndSpacingPx = 0;
             hotseatBarEndOffset = 0;
         }
 
@@ -662,7 +662,7 @@
         }
 
         // The side space with inline buttons should be what is defined in InvariantDeviceProfile
-        int sideSpacePx = mInlineNavButtonsEndSpacingPx;
+        int sideSpacePx = inlineNavButtonsEndSpacingPx;
         int maxHotseatWidthPx = availableWidthPx - sideSpacePx - hotseatBarEndOffset;
         int maxHotseatIconsWidthPx = maxHotseatWidthPx - (isQsbInline ? hotseatQsbWidth : 0);
         hotseatBorderSpace = calculateHotseatBorderSpace(maxHotseatIconsWidthPx,
@@ -1320,7 +1320,7 @@
             int endSpacing;
             // Hotseat aligns to the left with nav buttons
             if (hotseatBarEndOffset > 0) {
-                startSpacing = mInlineNavButtonsEndSpacingPx;
+                startSpacing = inlineNavButtonsEndSpacingPx;
                 endSpacing = availableWidthPx - hotseatWidth - startSpacing + hotseatBorderSpace;
             } else {
                 startSpacing = (availableWidthPx - hotseatWidth) / 2;