Create drop target bounds for bubbles

Bug: 393172431
Flag: EXEMPT not wired
Test: treehugger
Change-Id: I343be888d4ad622d517c4fd5af98c20eaf82c7a8

4 files changed, 137 insertions, 7 deletions

diff --git a/libs/WindowManager/Shell/shared/res/color/bubble_drop_target_background_color.xml b/libs/WindowManager/Shell/shared/res/color/bubble_drop_target_background_color.xml
new file mode 100644
index 000000000000..975d25b25953
--- /dev/null
+++ b/libs/WindowManager/Shell/shared/res/color/bubble_drop_target_background_color.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2025 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.
+  -->
+
+<selector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:androidprv="http://schemas.android.com/apk/prv/res/android">
+    <item android:alpha="0.35" android:color="@androidprv:color/materialColorPrimaryContainer" />
+</selector>
diff --git a/libs/WindowManager/Shell/shared/res/drawable/bubble_drop_target_background.xml b/libs/WindowManager/Shell/shared/res/drawable/bubble_drop_target_background.xml
new file mode 100644
index 000000000000..89546f9b0807
--- /dev/null
+++ b/libs/WindowManager/Shell/shared/res/drawable/bubble_drop_target_background.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2025 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.
+  -->
+
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"
+    android:shape="rectangle">
+    <corners android:radius="28dp" />
+    <solid android:color="@color/bubble_drop_target_background_color" />
+    <stroke
+        android:width="1dp"
+        android:color="@androidprv:color/materialColorPrimaryContainer" />
+</shape>
diff --git a/libs/WindowManager/Shell/shared/res/values/dimen.xml b/libs/WindowManager/Shell/shared/res/values/dimen.xml
index d280083ae7f5..5f013c52d70d 100644
--- a/libs/WindowManager/Shell/shared/res/values/dimen.xml
+++ b/libs/WindowManager/Shell/shared/res/values/dimen.xml
@@ -36,4 +36,13 @@
     <dimen name="drag_zone_v_split_from_expanded_view_height_tablet">285dp</dimen>
     <dimen name="drag_zone_v_split_from_expanded_view_height_fold_tall">150dp</dimen>
     <dimen name="drag_zone_v_split_from_expanded_view_height_fold_short">100dp</dimen>
+
+    <!-- Bubble drop target dimensions -->
+    <dimen name="drop_target_full_screen_padding">20dp</dimen>
+    <dimen name="drop_target_desktop_window_padding_small">100dp</dimen>
+    <dimen name="drop_target_desktop_window_padding_large">130dp</dimen>
+    <dimen name="drop_target_expanded_view_width">364</dimen>
+    <dimen name="drop_target_expanded_view_height">578</dimen>
+    <dimen name="drop_target_expanded_view_padding_bottom">108</dimen>
+    <dimen name="drop_target_expanded_view_padding_horizontal">24</dimen>
 </resources>
\ No newline at end of file
diff --git a/libs/WindowManager/Shell/shared/src/com/android/wm/shell/shared/bubbles/DragZoneFactory.kt b/libs/WindowManager/Shell/shared/src/com/android/wm/shell/shared/bubbles/DragZoneFactory.kt
index 909e9d2c4428..1a80b0f29aa9 100644
--- a/libs/WindowManager/Shell/shared/src/com/android/wm/shell/shared/bubbles/DragZoneFactory.kt
+++ b/libs/WindowManager/Shell/shared/src/com/android/wm/shell/shared/bubbles/DragZoneFactory.kt
@@ -18,6 +18,7 @@ package com.android.wm.shell.shared.bubbles
 
 import android.content.Context
 import android.graphics.Rect
+import android.util.TypedValue
 import androidx.annotation.DimenRes
 import com.android.wm.shell.shared.R
 import com.android.wm.shell.shared.bubbles.DragZoneFactory.SplitScreenModeChecker.SplitScreenMode
@@ -50,6 +51,60 @@ class DragZoneFactory(
     private var vSplitFromExpandedViewDragZoneHeightFoldTall = 0
     private var vSplitFromExpandedViewDragZoneHeightFoldShort = 0
 
+    private var fullScreenDropTargetPadding = 0
+    private var desktopWindowDropTargetPaddingSmall = 0
+    private var desktopWindowDropTargetPaddingLarge = 0
+    private var expandedViewDropTargetWidth = 0
+    private var expandedViewDropTargetHeight = 0
+    private var expandedViewDropTargetPaddingBottom = 0
+    private var expandedViewDropTargetPaddingHorizontal = 0
+
+    private val fullScreenDropTarget: Rect
+        get() =
+            Rect(windowBounds).apply {
+                inset(fullScreenDropTargetPadding, fullScreenDropTargetPadding)
+            }
+
+    private val desktopWindowDropTarget: Rect
+        get() =
+            Rect(windowBounds).apply {
+                if (deviceConfig.isLandscape) {
+                    inset(
+                        /* dx= */ desktopWindowDropTargetPaddingLarge,
+                        /* dy= */ desktopWindowDropTargetPaddingSmall
+                    )
+                } else {
+                    inset(
+                        /* dx= */ desktopWindowDropTargetPaddingSmall,
+                        /* dy= */ desktopWindowDropTargetPaddingLarge
+                    )
+                }
+            }
+
+    private val expandedViewDropTargetLeft: Rect
+        get() =
+            Rect(
+                expandedViewDropTargetPaddingHorizontal,
+                windowBounds.bottom -
+                    expandedViewDropTargetPaddingBottom -
+                    expandedViewDropTargetHeight,
+                expandedViewDropTargetWidth + expandedViewDropTargetPaddingHorizontal,
+                windowBounds.bottom - expandedViewDropTargetPaddingBottom
+            )
+
+    private val expandedViewDropTargetRight: Rect
+        get() =
+            Rect(
+                windowBounds.right -
+                    expandedViewDropTargetPaddingHorizontal -
+                    expandedViewDropTargetWidth,
+                windowBounds.bottom -
+                    expandedViewDropTargetPaddingBottom -
+                    expandedViewDropTargetHeight,
+                windowBounds.right - expandedViewDropTargetPaddingHorizontal,
+                windowBounds.bottom - expandedViewDropTargetPaddingBottom
+            )
+
     init {
         onConfigurationUpdated()
     }
@@ -88,11 +143,32 @@ class DragZoneFactory(
             context.resolveDimension(R.dimen.drag_zone_v_split_from_expanded_view_height_fold_tall)
         vSplitFromExpandedViewDragZoneHeightFoldShort =
             context.resolveDimension(R.dimen.drag_zone_v_split_from_expanded_view_height_fold_short)
+        fullScreenDropTargetPadding =
+            context.resolveDimension(R.dimen.drop_target_full_screen_padding)
+        desktopWindowDropTargetPaddingSmall =
+            context.resolveDimension(R.dimen.drop_target_desktop_window_padding_small)
+        desktopWindowDropTargetPaddingLarge =
+            context.resolveDimension(R.dimen.drop_target_desktop_window_padding_large)
+
+        // TODO b/393172431: Use the shared xml resources once we can easily access them from
+        //  launcher
+        expandedViewDropTargetWidth = 364.dpToPx()
+        expandedViewDropTargetHeight = 578.dpToPx()
+        expandedViewDropTargetPaddingBottom = 108.dpToPx()
+        expandedViewDropTargetPaddingHorizontal = 24.dpToPx()
     }
 
     private fun Context.resolveDimension(@DimenRes dimension: Int) =
         resources.getDimensionPixelSize(dimension)
 
+    private fun Int.dpToPx() =
+        TypedValue.applyDimension(
+                TypedValue.COMPLEX_UNIT_DIP,
+                this.toFloat(),
+                context.resources.displayMetrics
+            )
+            .toInt()
+
     /**
      * Creates the list of drag zones for the dragged object.
      *
@@ -155,7 +231,7 @@ class DragZoneFactory(
             DragZone.Bubble.Left(
                 bounds =
                     Rect(0, windowBounds.bottom - dragZoneSize, dragZoneSize, windowBounds.bottom),
-                dropTarget = Rect(0, 0, 0, 0),
+                dropTarget = expandedViewDropTargetLeft,
             ),
             DragZone.Bubble.Right(
                 bounds =
@@ -165,7 +241,7 @@ class DragZoneFactory(
                         windowBounds.right,
                         windowBounds.bottom,
                     ),
-                dropTarget = Rect(0, 0, 0, 0),
+                dropTarget = expandedViewDropTargetRight,
             )
         )
     }
@@ -174,7 +250,7 @@ class DragZoneFactory(
         return listOf(
             DragZone.Bubble.Left(
                 bounds = Rect(0, 0, windowBounds.right / 2, windowBounds.bottom),
-                dropTarget = Rect(0, 0, 0, 0),
+                dropTarget = expandedViewDropTargetLeft,
             ),
             DragZone.Bubble.Right(
                 bounds =
@@ -184,7 +260,7 @@ class DragZoneFactory(
                         windowBounds.right,
                         windowBounds.bottom,
                     ),
-                dropTarget = Rect(0, 0, 0, 0),
+                dropTarget = expandedViewDropTargetRight,
             )
         )
     }
@@ -198,7 +274,7 @@ class DragZoneFactory(
                     windowBounds.right / 2 + fullScreenDragZoneWidth / 2,
                     fullScreenDragZoneHeight
                 ),
-            dropTarget = Rect(0, 0, 0, 0)
+            dropTarget = fullScreenDropTarget
         )
     }
 
@@ -223,7 +299,7 @@ class DragZoneFactory(
                         windowBounds.bottom / 2 + desktopWindowDragZoneHeight / 2
                     )
                 },
-            dropTarget = Rect(0, 0, 0, 0)
+            dropTarget = desktopWindowDropTarget
         )
     }
 
@@ -236,7 +312,7 @@ class DragZoneFactory(
                     windowBounds.right / 2 + desktopWindowFromExpandedViewDragZoneWidth / 2,
                     windowBounds.bottom / 2 + desktopWindowFromExpandedViewDragZoneHeight / 2
                 ),
-            dropTarget = Rect(0, 0, 0, 0)
+            dropTarget = desktopWindowDropTarget
         )
     }