feat/add-drag-drop : Add Drag & Drop Functionality

Author: prateekbatra-g

app/src/main/java/com/example/cahier/MainActivity.kt

@@ -30,6 +30,7 @@ import androidx.core.content.IntentCompat
 import com.example.cahier.core.data.NoteType
 import com.example.cahier.features.home.CahierApp
 import com.example.cahier.core.ui.theme.CahierAppTheme
+import com.example.cahier.core.utils.createDragAndDropTarget
 import dagger.hilt.android.AndroidEntryPoint
 
 @AndroidEntryPoint
@@ -48,7 +49,9 @@ class MainActivity : ComponentActivity() {
         setContent {
             CahierAppTheme {
                 Surface(
-                    modifier = Modifier.fillMaxSize(),
+                    modifier = Modifier
+                        .fillMaxSize()
+                        .createDragAndDropTarget(this),
                     color = MaterialTheme.colorScheme.background
                 ) {
                     CahierApp(noteId = noteId, noteType = noteType)

app/src/main/java/com/example/cahier/core/utils/DragAndDropUtils.kt

@@ -18,13 +18,27 @@
 
 package com.example.cahier.core.utils
 
+import android.app.Activity
+import android.app.PendingIntent
+import android.content.ClipData
+import android.content.ClipDescription
+import android.content.Intent
 import android.net.Uri
+import android.os.Build
 import android.view.DragAndDropPermissions
+import android.view.View
 import androidx.activity.ComponentActivity
+import androidx.annotation.RequiresApi
 import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.draganddrop.dragAndDropSource
+import androidx.compose.foundation.draganddrop.dragAndDropTarget
+import androidx.compose.ui.Modifier
 import androidx.compose.ui.draganddrop.DragAndDropEvent
 import androidx.compose.ui.draganddrop.DragAndDropTarget
+import androidx.compose.ui.draganddrop.DragAndDropTransferData
 import androidx.compose.ui.draganddrop.toAndroidDragEvent
+import com.example.cahier.AppArgs
+import com.example.cahier.core.data.Note
 
 @OptIn(ExperimentalFoundationApi::class)
 fun createDropTarget(
@@ -43,3 +57,58 @@ fun createDropTarget(
         }
     }
 }
+
+fun Modifier.createDragAndDropSource(
+    activity: Activity?,
+    note: Note
+): Modifier = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.VANILLA_ICE_CREAM) {
+    dragAndDropSource { _ ->
+        activity?.let {
+            DragAndDropTransferData(
+                clipData = getClipData(it, note),
+                flags = View.DRAG_FLAG_GLOBAL_SAME_APPLICATION or View.DRAG_FLAG_START_INTENT_SENDER_ON_UNHANDLED_DRAG,
+            )
+        }
+    }
+} else {
+    this
+}
+
+fun Modifier.createDragAndDropTarget(
+    activity: Activity
+): Modifier = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.VANILLA_ICE_CREAM) {
+    dragAndDropTarget(
+        shouldStartDragAndDrop = { event ->
+            event.toAndroidDragEvent().clipDescription?.hasMimeType(ClipDescription.MIMETYPE_TEXT_INTENT) ?: false
+        },
+        target = object : DragAndDropTarget {
+            override fun onDrop(event: DragAndDropEvent): Boolean =
+                event.toAndroidDragEvent().clipData?.getItemAt(0)?.intent?.let {
+                    activity.startActivity(it)
+                    true
+                } ?: false
+        }
+    )
+} else {
+    this
+}
+
+
+@RequiresApi(Build.VERSION_CODES.VANILLA_ICE_CREAM)
+fun getClipData(activity: Activity, note: Note): ClipData {
+    val componentName = activity.componentName
+    val intent = Intent.makeMainActivity(componentName).apply {
+        putExtra(AppArgs.NOTE_ID_KEY, note.id)
+        putExtra(AppArgs.NOTE_TYPE_KEY, note.type)
+        flags = Intent.FLAG_ACTIVITY_NEW_TASK or
+                Intent.FLAG_ACTIVITY_MULTIPLE_TASK or
+                Intent.FLAG_ACTIVITY_LAUNCH_ADJACENT
+    }
+    val pendingIntent = PendingIntent.getActivity(
+        activity, 0, intent, PendingIntent.FLAG_IMMUTABLE
+    )
+    return ClipData(
+        AppArgs.NOTE_ID_KEY, arrayOf(ClipDescription.MIMETYPE_TEXT_INTENT),
+        ClipData.Item.Builder().setIntentSender(pendingIntent.intentSender).build()
+    )
+}

app/src/main/java/com/example/cahier/features/home/HomeScreenComponents.kt

@@ -18,6 +18,7 @@
 
 package com.example.cahier.features.home
 
+import androidx.activity.compose.LocalActivity
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
@@ -75,6 +76,7 @@ import com.example.cahier.R
 import com.example.cahier.core.data.Note
 import com.example.cahier.core.data.NoteType
 import com.example.cahier.core.ui.theme.CahierAppTheme
+import com.example.cahier.core.utils.createDragAndDropSource
 import com.example.cahier.features.drawing.DrawingDetailThumbnail
 
 @Composable
@@ -212,6 +214,7 @@ fun NoteItem(
             .fillMaxWidth()
             .clip(CardDefaults.outlinedShape)
             .clickable { onClick() }
+            .createDragAndDropSource(LocalActivity.current, note)
     ) {
         NoteItemContent(note)
         NoteItemActions(onToggleFavorite, note, onDelete, onNewWindow, isCompact)