1 files changed, 113 insertions, 0 deletions
diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardUnfoldTransition.kt b/packages/SystemUI/src/com/android/keyguard/KeyguardUnfoldTransition.kt
new file mode 100644
index 000000000000..cb25e1a2a40e
--- /dev/null
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardUnfoldTransition.kt
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2021 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.keyguard
+
+import android.content.Context
+import android.view.View
+import android.view.ViewGroup
+import com.android.systemui.R
+import com.android.systemui.unfold.SysUIUnfoldScope
+import com.android.systemui.unfold.UnfoldTransitionProgressProvider.TransitionProgressListener
+import com.android.systemui.unfold.util.NaturalRotationUnfoldProgressProvider
+import javax.inject.Inject
+
+/**
+ * Translates items away/towards the hinge when the device is opened/closed. This is controlled by
+ * the set of ids, which also dictact which direction to move and when, via a filter function.
+ */
+@SysUIUnfoldScope
+class KeyguardUnfoldTransition @Inject constructor(
+    val context: Context,
+    val unfoldProgressProvider: NaturalRotationUnfoldProgressProvider
+) {
+
+    companion object {
+        final val LEFT = -1
+        final val RIGHT = 1
+    }
+
+    private val filterSplitShadeOnly = { !statusViewCentered }
+    private val filterNever = { true }
+
+    private val ids = setOf(
+        Triple(R.id.keyguard_status_area, LEFT, filterNever),
+        Triple(R.id.controls_button, LEFT, filterNever),
+        Triple(R.id.lockscreen_clock_view_large, LEFT, filterSplitShadeOnly),
+        Triple(R.id.lockscreen_clock_view, LEFT, filterNever),
+        Triple(R.id.notification_stack_scroller, RIGHT, filterSplitShadeOnly),
+        Triple(R.id.wallet_button, RIGHT, filterNever)
+    )
+    private var parent: ViewGroup? = null
+    private var views = listOf<Triple<View, Int, () -> Boolean>>()
+    private var xTranslationMax = 0f
+
+    /**
+     * Certain views only need to move if they are not currently centered
+     */
+    var statusViewCentered = false
+
+    init {
+        unfoldProgressProvider.addCallback(
+            object : TransitionProgressListener {
+                override fun onTransitionStarted() {
+                    findViews()
+                }
+
+                override fun onTransitionProgress(progress: Float) {
+                    translateViews(progress)
+                }
+
+                override fun onTransitionFinished() {
+                    translateViews(1f)
+                }
+            }
+        )
+    }
+
+    /**
+     * Relies on the [parent] to locate views to translate
+     */
+    fun setup(parent: ViewGroup) {
+        this.parent = parent
+        xTranslationMax = context.resources.getDimensionPixelSize(
+            R.dimen.keyguard_unfold_translation_x).toFloat()
+    }
+
+    /**
+     * Manually translate views based on set direction. At the moment
+     * [UnfoldMoveFromCenterAnimator] exists but moves all views a dynamic distance
+     * from their mid-point. This code instead will only ever translate by a fixed amount.
+     */
+    private fun translateViews(progress: Float) {
+        val xTrans = progress * xTranslationMax - xTranslationMax
+        views.forEach {
+            (view, direction, pred) -> if (pred()) {
+                view.setTranslationX(xTrans * direction)
+            }
+        }
+    }
+
+    private fun findViews() {
+        parent?.let { p ->
+            views = ids.mapNotNull {
+                (id, direction, pred) -> p.findViewById<View>(id)?.let {
+                    Triple(it, direction, pred)
+                }
+            }
+        }
+    }
+}