Zoom

sher-gil/src/main/java/com/kinnerapriyap/sugar/choice/ChoiceBuilder.kt

@@ -146,6 +146,18 @@ class ChoiceBuilder private constructor(
             choiceSpec.orientation = orientation
         }
 
+    /**
+     * Sets the maximum scale factor for zoom in preview
+     * Zoom will be disabled in preview if value is set to 1f
+     *
+     * @param previewMaxScaleFactor Float default is 5f
+     * @return [ChoiceBuilder] instance
+     */
+    fun previewMaxScaleFactor(previewMaxScaleFactor: Float): ChoiceBuilder =
+        apply {
+            choiceSpec.previewMaxScaleFactor = previewMaxScaleFactor
+        }
+
     /**
      * Opens media selection with the requestCode provided
      *

sher-gil/src/main/java/com/kinnerapriyap/sugar/choice/ChoiceSpec.kt

@@ -15,6 +15,7 @@ class ChoiceSpec private constructor() {
     var showDeviceCamera: Boolean = false
     var showCameraFirst: Boolean = false
     var orientation: Int = ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED
+    var previewMaxScaleFactor: Float = 5f
 
     private object InstanceHolder {
         val INSTANCE = ChoiceSpec()
@@ -44,5 +45,6 @@ class ChoiceSpec private constructor() {
         showDeviceCamera = false
         showCameraFirst = false
         orientation = ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED
+        previewMaxScaleFactor = 5f
     }
 }

sher-gil/src/main/java/com/kinnerapriyap/sugar/mediagallery/MediaGalleryFragment.kt

@@ -86,7 +86,7 @@ class MediaGalleryFragment : Fragment(), MediaCellListener {
 
     override fun onMediaCellClicked(displayModel: MediaCellDisplayModel) {
         if (displayModel.id == CAMERA_CAPTURE_ID)
-        (requireActivity() as? ShergilActivity)?.askPermissionAndOpenCameraCapture()
+            (requireActivity() as? ShergilActivity)?.askPermissionAndOpenCameraCapture()
         else
             viewModel.setMediaChecked(displayModel)
     }

sher-gil/src/main/java/com/kinnerapriyap/sugar/mediapreview/MediaPreviewAdapter.kt

@@ -1,16 +1,10 @@
 package com.kinnerapriyap.sugar.mediapreview
 
-import android.view.LayoutInflater
-import android.view.ViewGroup
-import androidx.databinding.DataBindingUtil
-import androidx.recyclerview.widget.RecyclerView
-import com.kinnerapriyap.sugar.R
-import com.kinnerapriyap.sugar.databinding.ViewMediaObjectPreviewBinding
+import androidx.fragment.app.Fragment
+import androidx.viewpager2.adapter.FragmentStateAdapter
 import com.kinnerapriyap.sugar.mediagallery.cell.MediaCellDisplayModel
 
-class MediaPreviewAdapter(
-    private val mediaObjectPreviewListener: MediaObjectPreviewListener
-) : RecyclerView.Adapter<MediaPreviewAdapter.MediaPreviewObjectHolder>() {
+class MediaPreviewAdapter(fragment: Fragment) : FragmentStateAdapter(fragment) {
 
     var selectedMedia: List<MediaCellDisplayModel> = listOf()
         set(value) {
@@ -20,30 +14,6 @@ class MediaPreviewAdapter(
 
     override fun getItemCount(): Int = selectedMedia.size
 
-    override fun onCreateViewHolder(
-        parent: ViewGroup,
-        viewType: Int
-    ): MediaPreviewObjectHolder {
-        val binding = DataBindingUtil.inflate<ViewMediaObjectPreviewBinding>(
-            LayoutInflater.from(parent.context),
-            R.layout.view_media_object_preview,
-            parent,
-            false
-        )
-        return MediaPreviewObjectHolder(binding)
-    }
-
-    override fun onBindViewHolder(holder: MediaPreviewObjectHolder, position: Int) {
-        holder.bind(selectedMedia[position], mediaObjectPreviewListener)
-    }
-
-    inner class MediaPreviewObjectHolder(
-        private val binding: ViewMediaObjectPreviewBinding
-    ) : RecyclerView.ViewHolder(binding.root) {
-        fun bind(displayModel: MediaCellDisplayModel, listener: MediaObjectPreviewListener) {
-            binding.displayModel = displayModel
-            binding.listener = listener
-            binding.executePendingBindings()
-        }
-    }
+    override fun createFragment(position: Int): Fragment =
+        MediaPreviewPageFragment.createInstance(selectedMedia[position])
 }

sher-gil/src/main/java/com/kinnerapriyap/sugar/mediapreview/MediaPreviewPageFragment.kt

@@ -0,0 +1,85 @@
+package com.kinnerapriyap.sugar.mediapreview
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.ScaleGestureDetector
+import android.view.View
+import android.view.ViewGroup
+import android.view.MotionEvent
+import androidx.databinding.DataBindingUtil
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.activityViewModels
+import com.kinnerapriyap.sugar.R
+import com.kinnerapriyap.sugar.ShergilViewModel
+import com.kinnerapriyap.sugar.databinding.FragmentMediaPreviewPageBinding
+import com.kinnerapriyap.sugar.mediagallery.cell.MediaCellDisplayModel
+
+class MediaPreviewPageFragment : Fragment(), View.OnTouchListener {
+
+    private val viewModel: ShergilViewModel by activityViewModels()
+
+    private var binding: FragmentMediaPreviewPageBinding? = null
+
+    private var scaleFactor = 1f
+
+    private lateinit var scaleListener: ScaleGestureDetector.SimpleOnScaleGestureListener
+
+    private val scaleDetector by lazy {
+        ScaleGestureDetector(context, scaleListener)
+    }
+
+    private val displayModel: MediaCellDisplayModel?
+        get() = arguments?.getParcelable(MEDIA_CELL_DISPLAY_MODEL)
+
+    companion object {
+        private const val MEDIA_CELL_DISPLAY_MODEL = "media_cell_display_model"
+
+        @JvmStatic
+        fun createInstance(displayModel: MediaCellDisplayModel) =
+            MediaPreviewPageFragment().apply {
+                arguments = Bundle().apply {
+                    putParcelable(MEDIA_CELL_DISPLAY_MODEL, displayModel)
+                }
+            }
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        binding = DataBindingUtil.inflate(
+            inflater,
+            R.layout.fragment_media_preview_page,
+            container,
+            false
+        )
+        binding?.root?.setOnTouchListener(this)
+        return binding?.root
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        binding?.displayModel = displayModel
+        binding?.listener = parentFragment as? MediaPreviewFragment
+        scaleListener = object : ScaleGestureDetector.SimpleOnScaleGestureListener() {
+
+            override fun onScale(detector: ScaleGestureDetector): Boolean {
+                scaleFactor *= detector.scaleFactor
+                scaleFactor =
+                    1f.coerceAtLeast(
+                        scaleFactor.coerceAtMost(
+                            viewModel.getChoiceSpec().previewMaxScaleFactor
+                        )
+                    )
+                binding?.imageView?.scaleX = scaleFactor
+                binding?.imageView?.scaleY = scaleFactor
+                return true
+            }
+        }
+    }
+
+    override fun onTouch(v: View?, event: MotionEvent?): Boolean {
+        scaleDetector.onTouchEvent(event)
+        return true
+    }
+}

sher-gil/src/main/res/layout/view_media_object_preview.xml → sher-gil/src/main/res/layout/fragment_media_preview_page.xml

@@ -18,7 +18,7 @@
         android:layout_height="match_parent">
 
         <com.google.android.material.checkbox.MaterialCheckBox
-            android:id="@+id/preivewCheckBox"
+            android:id="@+id/previewCheckBox"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:checked="@{displayModel.isChecked}"
@@ -39,6 +39,6 @@
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toBottomOf="@id/preivewCheckBox" />
+            app:layout_constraintTop_toBottomOf="@id/previewCheckBox" />
     </androidx.constraintlayout.widget.ConstraintLayout>
 </layout>