1 files changed, 95 insertions, 0 deletions
diff --git a/src/com/android/wallpaper/picker/preview/ui/binder/DualPreviewSelectorBinder.kt b/src/com/android/wallpaper/picker/preview/ui/binder/DualPreviewSelectorBinder.kt
new file mode 100644
index 00000000..6d7c78d3
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+++ b/src/com/android/wallpaper/picker/preview/ui/binder/DualPreviewSelectorBinder.kt
@@ -0,0 +1,95 @@
+/*
+ * 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.wallpaper.picker.preview.ui.binder
+
+import android.content.Context
+import android.view.View
+import androidx.lifecycle.LifecycleOwner
+import androidx.viewpager.widget.ViewPager
+import com.android.wallpaper.picker.preview.ui.fragment.smallpreview.DualPreviewViewPager
+import com.android.wallpaper.picker.preview.ui.viewmodel.WallpaperPreviewViewModel
+import kotlinx.coroutines.CoroutineScope
+
+/**
+ * This binder binds the data and view models for the dual preview collection on the small preview
+ * screen.
+ */
+object DualPreviewSelectorBinder {
+
+    fun bind(
+        tabsViewPager: ViewPager,
+        dualPreviewView: DualPreviewViewPager,
+        wallpaperPreviewViewModel: WallpaperPreviewViewModel,
+        applicationContext: Context,
+        viewLifecycleOwner: LifecycleOwner,
+        mainScope: CoroutineScope,
+        navigate: (View) -> Unit,
+    ) {
+        // set up tabs view pager
+        TabPagerBinder.bind(tabsViewPager)
+
+        // synchronize both view and tabs pager
+        synchronizePreviewAndTabsPager(tabsViewPager, dualPreviewView)
+
+        DualPreviewPagerBinder.bind(
+            dualPreviewView,
+            wallpaperPreviewViewModel,
+            applicationContext,
+            viewLifecycleOwner,
+            mainScope,
+            navigate,
+        )
+    }
+
+    private fun synchronizePreviewAndTabsPager(
+        tabsViewPager: ViewPager,
+        previewsViewPager: ViewPager,
+    ) {
+        val onPageChangeListenerTabs =
+            object : ViewPager.OnPageChangeListener {
+                override fun onPageSelected(position: Int) {
+                    previewsViewPager.setCurrentItem(position, true)
+                }
+
+                override fun onPageScrolled(
+                    position: Int,
+                    positionOffset: Float,
+                    positionOffsetPixels: Int
+                ) {}
+
+                override fun onPageScrollStateChanged(state: Int) {}
+            }
+
+        tabsViewPager.addOnPageChangeListener(onPageChangeListenerTabs)
+
+        val onPageChangeListenerPreviews =
+            object : ViewPager.OnPageChangeListener {
+                override fun onPageSelected(position: Int) {
+                    tabsViewPager.setCurrentItem(position, true)
+                }
+
+                override fun onPageScrolled(
+                    position: Int,
+                    positionOffset: Float,
+                    positionOffsetPixels: Int
+                ) {}
+
+                override fun onPageScrollStateChanged(state: Int) {}
+            }
+
+        previewsViewPager.addOnPageChangeListener(onPageChangeListenerPreviews)
+    }
+}