Shareousel target intent modifier component

A building block for the payload toggling functinality. Modifies target
intent based on the set of selected items.

Bug: 302691505
Test: IntentResolver-tests-unit
Change-Id: If3b165254fef70cf58718e20d28e874554a9818f

1 files changed, 66 insertions, 0 deletions

diff --git a/java/src/com/android/intentresolver/contentpreview/TargetIntentModifier.kt b/java/src/com/android/intentresolver/contentpreview/TargetIntentModifier.kt
new file mode 100644
index 00000000..99cfc0f8
--- /dev/null
+++ b/java/src/com/android/intentresolver/contentpreview/TargetIntentModifier.kt
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2024 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.intentresolver.contentpreview
+
+import android.content.ClipDescription.compareMimeTypes
+import android.content.Intent
+import android.content.Intent.ACTION_SEND
+import android.content.Intent.ACTION_SEND_MULTIPLE
+import android.content.Intent.EXTRA_STREAM
+import android.net.Uri
+
+/** Modifies target intent based on current payload selection. */
+class TargetIntentModifier<Item>(
+    private val originalTargetIntent: Intent,
+    private val getUri: Item.() -> Uri,
+    private val getMimeType: Item.() -> String?,
+) : (List<Item>) -> Intent {
+    fun onSelectionChanged(selection: List<Item>): Intent {
+        val uris = ArrayList<Uri>(selection.size)
+        var targetMimeType: String? = null
+        for (item in selection) {
+            targetMimeType = updateMimeType(item.getMimeType(), targetMimeType)
+            uris.add(item.getUri())
+        }
+        val action = if (uris.size == 1) ACTION_SEND else ACTION_SEND_MULTIPLE
+        return Intent(originalTargetIntent).apply {
+            this.action = action
+            this.type = targetMimeType
+            if (action == ACTION_SEND) {
+                putExtra(EXTRA_STREAM, uris[0])
+            } else {
+                putParcelableArrayListExtra(EXTRA_STREAM, uris)
+            }
+        }
+    }
+
+    private fun updateMimeType(itemMimeType: String?, unitedMimeType: String?): String {
+        itemMimeType ?: return "*/*"
+        unitedMimeType ?: return itemMimeType
+        if (compareMimeTypes(itemMimeType, unitedMimeType)) return unitedMimeType
+        val slashIdx = unitedMimeType.indexOf('/')
+        if (slashIdx >= 0 && unitedMimeType.regionMatches(0, itemMimeType, 0, slashIdx + 1)) {
+            return buildString {
+                append(unitedMimeType.substring(0, slashIdx + 1))
+                append('*')
+            }
+        }
+        return "*/*"
+    }
+
+    override fun invoke(selection: List<Item>): Intent = onSelectionChanged(selection)
+}