App Pairs: Launch animation

[App Pairs 7/?]

This patch implements the app pair launch animation from icon. Adds a new function, composeFadeInSplitLaunchAnimator(), in SplitAnimationController, that builds the combined launcher + shell animation.

Bug: 309618233
Flag: ACONFIG com.android.wm.shell.enable_app_pairs DEVELOPMENT
Test: Manual
Change-Id: I8e95f629ae2a71f1bd6cbb356f5e33233e5c2906
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index e301bdb..031ca5b 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -3212,7 +3212,7 @@
      * Handles an app pair launch; overridden in
      * {@link com.android.launcher3.uioverrides.QuickstepLauncher}
      */
-    public void launchAppPair(WorkspaceItemInfo app1, WorkspaceItemInfo app2) {
+    public void launchAppPair(AppPairIcon appPairIcon) {
         // Overridden
     }
 
diff --git a/src/com/android/launcher3/apppairs/AppPairIcon.java b/src/com/android/launcher3/apppairs/AppPairIcon.java
index 46932fb..d201b8f 100644
--- a/src/com/android/launcher3/apppairs/AppPairIcon.java
+++ b/src/com/android/launcher3/apppairs/AppPairIcon.java
@@ -17,11 +17,10 @@
 package com.android.launcher3.apppairs;
 
 import android.content.Context;
-import android.graphics.Canvas;
 import android.graphics.Rect;
-import android.graphics.drawable.Drawable;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
+import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
 
@@ -33,7 +32,6 @@
 import com.android.launcher3.Reorderable;
 import com.android.launcher3.dragndrop.DraggableView;
 import com.android.launcher3.model.data.FolderInfo;
-import com.android.launcher3.model.data.WorkspaceItemInfo;
 import com.android.launcher3.util.MultiTranslateDelegate;
 import com.android.launcher3.views.ActivityContext;
 
@@ -47,33 +45,8 @@
  * member apps are set into these rectangles.
  */
 public class AppPairIcon extends FrameLayout implements DraggableView, Reorderable {
-    /**
-     * Design specs -- the below ratios are in relation to the size of a standard app icon.
-     */
-    private static final float OUTER_PADDING_SCALE = 1 / 30f;
-    private static final float INNER_PADDING_SCALE = 1 / 24f;
-    private static final float MEMBER_ICON_SCALE = 11 / 30f;
-    private static final float CENTER_CHANNEL_SCALE = 1 / 30f;
-    private static final float BIG_RADIUS_SCALE = 1 / 5f;
-    private static final float SMALL_RADIUS_SCALE = 1 / 15f;
-
-    // App pair icons are slightly smaller than regular icons, so we pad the icon by this much on
-    // each side.
-    float mOuterPadding;
-    // Inside of the icon, the two member apps are padded by this much.
-    float mInnerPadding;
-    // The two member apps have icons that are this big (in diameter).
-    float mMemberIconSize;
-    // The size of the center channel.
-    float mCenterChannelSize;
-    // The large outer radius of the background rectangles.
-    float mBigRadius;
-    // The small inner radius of the background rectangles.
-    float mSmallRadius;
-    // The app pairs icon appears differently in portrait and landscape.
-    boolean mIsLandscape;
-
-    private ActivityContext mActivity;
+    // A view that holds the app pair icon graphic.
+    private AppPairIconGraphic mIconGraphic;
     // A view that holds the app pair's title.
     private BubbleTextView mAppPairName;
     // The underlying ItemInfo that stores info about the app pair members, etc.
@@ -109,7 +82,10 @@
         icon.setTag(appPairInfo);
         icon.setOnClickListener(activity.getItemOnClickListener());
         icon.mInfo = appPairInfo;
-        icon.mActivity = activity;
+
+        // Set up icon drawable area
+        icon.mIconGraphic = icon.findViewById(R.id.app_pair_icon_graphic);
+        icon.mIconGraphic.init(activity.getDeviceProfile(), icon);
 
         // Set up app pair title
         icon.mAppPairName = icon.findViewById(R.id.app_pair_icon_name);
@@ -127,85 +103,6 @@
         return icon;
     }
 
-    @Override
-    protected void dispatchDraw(Canvas canvas) {
-        super.dispatchDraw(canvas);
-
-        // Calculate device-specific measurements
-        DeviceProfile grid = mActivity.getDeviceProfile();
-        int defaultIconSize = grid.iconSizePx;
-        mOuterPadding = OUTER_PADDING_SCALE * defaultIconSize;
-        mInnerPadding = INNER_PADDING_SCALE * defaultIconSize;
-        mMemberIconSize = MEMBER_ICON_SCALE * defaultIconSize;
-        mCenterChannelSize = CENTER_CHANNEL_SCALE * defaultIconSize;
-        mBigRadius = BIG_RADIUS_SCALE * defaultIconSize;
-        mSmallRadius = SMALL_RADIUS_SCALE * defaultIconSize;
-        mIsLandscape = grid.isLeftRightSplit;
-
-        // Calculate drawable area position
-        float leftBound = (canvas.getWidth() / 2f) - (defaultIconSize / 2f);
-        float topBound = getPaddingTop();
-
-        // Prepare to draw app pair icon background
-        Drawable background = new AppPairIconBackground(getContext(), this);
-        background.setBounds(0, 0, defaultIconSize, defaultIconSize);
-
-        // Draw background
-        canvas.save();
-        canvas.translate(leftBound, topBound);
-        background.draw(canvas);
-        canvas.restore();
-
-        // Prepare to draw icons
-        WorkspaceItemInfo app1 = mInfo.contents.get(0);
-        WorkspaceItemInfo app2 = mInfo.contents.get(1);
-        Drawable app1Icon = app1.newIcon(getContext());
-        Drawable app2Icon = app2.newIcon(getContext());
-        app1Icon.setBounds(0, 0, defaultIconSize, defaultIconSize);
-        app2Icon.setBounds(0, 0, defaultIconSize, defaultIconSize);
-
-        // Draw first icon
-        canvas.save();
-        canvas.translate(leftBound, topBound);
-        // The app icons are placed differently depending on device orientation.
-        if (mIsLandscape) {
-            canvas.translate(
-                    (defaultIconSize / 2f) - (mCenterChannelSize / 2f) - mInnerPadding
-                            - mMemberIconSize,
-                    (defaultIconSize / 2f) - (mMemberIconSize / 2f)
-            );
-        } else {
-            canvas.translate(
-                    (defaultIconSize / 2f) - (mMemberIconSize / 2f),
-                    (defaultIconSize / 2f) - (mCenterChannelSize / 2f) - mInnerPadding
-                            - mMemberIconSize
-            );
-
-        }
-        canvas.scale(MEMBER_ICON_SCALE, MEMBER_ICON_SCALE);
-        app1Icon.draw(canvas);
-        canvas.restore();
-
-        // Draw second icon
-        canvas.save();
-        canvas.translate(leftBound, topBound);
-        // The app icons are placed differently depending on device orientation.
-        if (mIsLandscape) {
-            canvas.translate(
-                    (defaultIconSize / 2f) + (mCenterChannelSize / 2f) + mInnerPadding,
-                    (defaultIconSize / 2f) - (mMemberIconSize / 2f)
-            );
-        } else {
-            canvas.translate(
-                    (defaultIconSize / 2f) - (mMemberIconSize / 2f),
-                    (defaultIconSize / 2f) + (mCenterChannelSize / 2f) + mInnerPadding
-            );
-        }
-        canvas.scale(MEMBER_ICON_SCALE, MEMBER_ICON_SCALE);
-        app2Icon.draw(canvas);
-        canvas.restore();
-    }
-
     /**
      * Returns a formatted accessibility title for app pairs.
      */
@@ -257,4 +154,8 @@
     public FolderInfo getInfo() {
         return mInfo;
     }
+
+    public View getIconDrawableArea() {
+        return mIconGraphic;
+    }
 }
diff --git a/src/com/android/launcher3/apppairs/AppPairIconBackground.java b/src/com/android/launcher3/apppairs/AppPairIconBackground.java
index 735c82f..4e60ece 100644
--- a/src/com/android/launcher3/apppairs/AppPairIconBackground.java
+++ b/src/com/android/launcher3/apppairs/AppPairIconBackground.java
@@ -32,8 +32,8 @@
  * A Drawable for the background behind the twin app icons (looks like two rectangles).
  */
 class AppPairIconBackground extends Drawable {
-    // The icon that we will draw this background on.
-    private final AppPairIcon icon;
+    // The underlying view that we are drawing this background on.
+    private final AppPairIconGraphic icon;
     private final Paint mBackgroundPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
 
     /**
@@ -44,8 +44,8 @@
     private static final RectF EMPTY_RECT = new RectF();
     private static final float[] ARRAY_OF_ZEROES = new float[8];
 
-    AppPairIconBackground(Context context, AppPairIcon appPairIcon) {
-        icon = appPairIcon;
+    AppPairIconBackground(Context context, AppPairIconGraphic iconGraphic) {
+        icon = iconGraphic;
         // Set up background paint color
         TypedArray ta = context.getTheme().obtainStyledAttributes(R.styleable.FolderIconPreview);
         mBackgroundPaint.setStyle(Paint.Style.FILL);
@@ -56,7 +56,7 @@
 
     @Override
     public void draw(Canvas canvas) {
-        if (icon.mIsLandscape) {
+        if (icon.isLeftRightSplit()) {
             drawLeftRightSplit(canvas);
         } else {
             drawTopBottomSplit(canvas);
@@ -73,29 +73,29 @@
 
         // The left half of the background image, excluding center channel
         RectF leftSide = new RectF(
-                icon.mOuterPadding,
-                icon.mOuterPadding,
-                (width / 2f) - (icon.mCenterChannelSize / 2f),
-                height - icon.mOuterPadding
+                0,
+                0,
+                (width / 2f) - (icon.getCenterChannelSize() / 2f),
+                height
         );
         // The right half of the background image, excluding center channel
         RectF rightSide = new RectF(
-                (width / 2f) + (icon.mCenterChannelSize / 2f),
-                icon.mOuterPadding,
-                width - icon.mOuterPadding,
-                height - icon.mOuterPadding
+                (width / 2f) + (icon.getCenterChannelSize() / 2f),
+                0,
+                width,
+                height
         );
 
         drawCustomRoundedRect(canvas, leftSide, new float[]{
-                icon.mBigRadius, icon.mBigRadius,
-                icon.mSmallRadius, icon.mSmallRadius,
-                icon.mSmallRadius, icon.mSmallRadius,
-                icon.mBigRadius, icon.mBigRadius});
+                icon.getBigRadius(), icon.getBigRadius(),
+                icon.getSmallRadius(), icon.getSmallRadius(),
+                icon.getSmallRadius(), icon.getSmallRadius(),
+                icon.getBigRadius(), icon.getBigRadius()});
         drawCustomRoundedRect(canvas, rightSide, new float[]{
-                icon.mSmallRadius, icon.mSmallRadius,
-                icon.mBigRadius, icon.mBigRadius,
-                icon.mBigRadius, icon.mBigRadius,
-                icon.mSmallRadius, icon.mSmallRadius});
+                icon.getSmallRadius(), icon.getSmallRadius(),
+                icon.getBigRadius(), icon.getBigRadius(),
+                icon.getBigRadius(), icon.getBigRadius(),
+                icon.getSmallRadius(), icon.getSmallRadius()});
     }
 
     /**
@@ -108,29 +108,29 @@
 
         // The top half of the background image, excluding center channel
         RectF topSide = new RectF(
-                icon.mOuterPadding,
-                icon.mOuterPadding,
-                width - icon.mOuterPadding,
-                (height / 2f) - (icon.mCenterChannelSize / 2f)
+                0,
+                0,
+                width,
+                (height / 2f) - (icon.getCenterChannelSize() / 2f)
         );
         // The bottom half of the background image, excluding center channel
         RectF bottomSide = new RectF(
-                icon.mOuterPadding,
-                (height / 2f) + (icon.mCenterChannelSize / 2f),
-                width - icon.mOuterPadding,
-                height - icon.mOuterPadding
+                0,
+                (height / 2f) + (icon.getCenterChannelSize() / 2f),
+                width,
+                height
         );
 
         drawCustomRoundedRect(canvas, topSide, new float[]{
-                icon.mBigRadius, icon.mBigRadius,
-                icon.mBigRadius, icon.mBigRadius,
-                icon.mSmallRadius, icon.mSmallRadius,
-                icon.mSmallRadius, icon.mSmallRadius});
+                icon.getBigRadius(), icon.getBigRadius(),
+                icon.getBigRadius(), icon.getBigRadius(),
+                icon.getSmallRadius(), icon.getSmallRadius(),
+                icon.getSmallRadius(), icon.getSmallRadius()});
         drawCustomRoundedRect(canvas, bottomSide, new float[]{
-                icon.mSmallRadius, icon.mSmallRadius,
-                icon.mSmallRadius, icon.mSmallRadius,
-                icon.mBigRadius, icon.mBigRadius,
-                icon.mBigRadius, icon.mBigRadius});
+                icon.getSmallRadius(), icon.getSmallRadius(),
+                icon.getSmallRadius(), icon.getSmallRadius(),
+                icon.getBigRadius(), icon.getBigRadius(),
+                icon.getBigRadius(), icon.getBigRadius()});
     }
 
     /**
@@ -146,7 +146,7 @@
             c.drawDoubleRoundRect(rect, radii, EMPTY_RECT, ARRAY_OF_ZEROES, mBackgroundPaint);
         } else {
             // Fallback rectangle with uniform rounded corners
-            c.drawRoundRect(rect, icon.mBigRadius, icon.mBigRadius, mBackgroundPaint);
+            c.drawRoundRect(rect, icon.getBigRadius(), icon.getBigRadius(), mBackgroundPaint);
         }
     }
 
diff --git a/src/com/android/launcher3/apppairs/AppPairIconGraphic.kt b/src/com/android/launcher3/apppairs/AppPairIconGraphic.kt
new file mode 100644
index 0000000..34467ec
--- /dev/null
+++ b/src/com/android/launcher3/apppairs/AppPairIconGraphic.kt
@@ -0,0 +1,128 @@
+/*
+ * 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.launcher3.apppairs
+
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.drawable.Drawable
+import android.util.AttributeSet
+import android.view.Gravity
+import android.widget.FrameLayout
+import com.android.launcher3.DeviceProfile
+
+/**
+ * A FrameLayout marking the area on an [AppPairIcon] where the visual icon will be drawn. One of
+ * two child UI elements on an [AppPairIcon], along with a BubbleTextView holding the text title.
+ */
+class AppPairIconGraphic
+@JvmOverloads
+constructor(context: Context, attrs: AttributeSet? = null) : FrameLayout(context, attrs) {
+    companion object {
+        // Design specs -- the below ratios are in relation to the size of a standard app icon.
+        private const val OUTER_PADDING_SCALE = 1 / 30f
+        private const val INNER_PADDING_SCALE = 1 / 24f
+        private const val MEMBER_ICON_SCALE = 11 / 30f
+        private const val CENTER_CHANNEL_SCALE = 1 / 30f
+        private const val BIG_RADIUS_SCALE = 1 / 5f
+        private const val SMALL_RADIUS_SCALE = 1 / 15f
+    }
+
+    // App pair icons are slightly smaller than regular icons, so we pad the icon by this much on
+    // each side.
+    private var outerPadding = 0f
+    // Inside of the icon, the two member apps are padded by this much.
+    private var innerPadding = 0f
+    // The colored background (two rectangles in a square area) is this big.
+    private var backgroundSize = 0f
+    // The two member apps have icons that are this big (in diameter).
+    private var memberIconSize = 0f
+    // The size of the center channel.
+    var centerChannelSize = 0f
+    // The large outer radius of the background rectangles.
+    var bigRadius = 0f
+    // The small inner radius of the background rectangles.
+    var smallRadius = 0f
+    // The app pairs icon appears differently in portrait and landscape.
+    var isLeftRightSplit = false
+
+    private lateinit var appPairBackground: Drawable
+    private lateinit var appIcon1: Drawable
+    private lateinit var appIcon2: Drawable
+
+    fun init(grid: DeviceProfile, icon: AppPairIcon) {
+        // Calculate device-specific measurements
+        val defaultIconSize = grid.iconSizePx
+        outerPadding = OUTER_PADDING_SCALE * defaultIconSize
+        innerPadding = INNER_PADDING_SCALE * defaultIconSize
+        backgroundSize = defaultIconSize - outerPadding * 2
+        memberIconSize = MEMBER_ICON_SCALE * defaultIconSize
+        centerChannelSize = CENTER_CHANNEL_SCALE * defaultIconSize
+        bigRadius = BIG_RADIUS_SCALE * defaultIconSize
+        smallRadius = SMALL_RADIUS_SCALE * defaultIconSize
+        isLeftRightSplit = grid.isLeftRightSplit
+
+        appPairBackground = AppPairIconBackground(context, this)
+        appPairBackground.setBounds(0, 0, backgroundSize.toInt(), backgroundSize.toInt())
+        appIcon1 = icon.info.contents[0].newIcon(context)
+        appIcon2 = icon.info.contents[1].newIcon(context)
+        appIcon1.setBounds(0, 0, memberIconSize.toInt(), memberIconSize.toInt())
+        appIcon2.setBounds(0, 0, memberIconSize.toInt(), memberIconSize.toInt())
+    }
+
+    override fun dispatchDraw(canvas: Canvas) {
+        super.dispatchDraw(canvas)
+
+        // Center the drawable area in the larger icon canvas
+        val lp: LayoutParams = layoutParams as LayoutParams
+        lp.gravity = Gravity.CENTER_HORIZONTAL
+        lp.topMargin = outerPadding.toInt()
+        lp.height = backgroundSize.toInt()
+        lp.width = backgroundSize.toInt()
+        layoutParams = lp
+
+        // Draw background
+        appPairBackground.draw(canvas)
+
+        // Draw first icon
+        canvas.save()
+        // The app icons are placed differently depending on device orientation.
+        if (isLeftRightSplit) {
+            canvas.translate(innerPadding, height / 2f - memberIconSize / 2f)
+        } else {
+            canvas.translate(width / 2f - memberIconSize / 2f, innerPadding)
+        }
+        appIcon1.draw(canvas)
+        canvas.restore()
+
+        // Draw second icon
+        canvas.save()
+        // The app icons are placed differently depending on device orientation.
+        if (isLeftRightSplit) {
+            canvas.translate(
+                width - (innerPadding + memberIconSize),
+                height / 2f - memberIconSize / 2f
+            )
+        } else {
+            canvas.translate(
+                width / 2f - memberIconSize / 2f,
+                height - (innerPadding + memberIconSize)
+            )
+        }
+        appIcon2.draw(canvas)
+        canvas.restore()
+    }
+}
diff --git a/src/com/android/launcher3/touch/ItemClickHandler.java b/src/com/android/launcher3/touch/ItemClickHandler.java
index 3bce377..a9c2a2e 100644
--- a/src/com/android/launcher3/touch/ItemClickHandler.java
+++ b/src/com/android/launcher3/touch/ItemClickHandler.java
@@ -145,8 +145,8 @@
      */
     private static void onClickAppPairIcon(View v) {
         Launcher launcher = Launcher.getLauncher(v.getContext());
-        FolderInfo folderInfo = ((AppPairIcon) v).getInfo();
-        launcher.launchAppPair(folderInfo.contents.get(0), folderInfo.contents.get(1));
+        AppPairIcon appPairIcon = (AppPairIcon) v;
+        launcher.launchAppPair(appPairIcon);
     }
 
     /**