From 3ebab3f7c287230742c50c84087676366a228623 Mon Sep 17 00:00:00 2001
From: Justin Ghan <justinghan@google.com>
Date: Thu, 11 Aug 2022 14:22:52 -0700
Subject: [PATCH] TextView implementation of insert gesture

Bug: 240435922
Test: atest android.widget.cts.TextViewHandwritingGestureTest
Change-Id: I3c7eb06925081bd5e699999c69437ef8bb929741
---
 core/java/android/widget/TextView.java        | 27 +++++++++++++++++++
 .../inputmethod/EditableInputConnection.java  |  3 +++
 2 files changed, 30 insertions(+)

diff --git a/core/java/android/widget/TextView.java b/core/java/android/widget/TextView.java
index 8419d8adb3296..28b83b2068bae 100644
--- a/core/java/android/widget/TextView.java
+++ b/core/java/android/widget/TextView.java
@@ -72,6 +72,7 @@ import android.graphics.Insets;
 import android.graphics.Paint;
 import android.graphics.Paint.FontMetricsInt;
 import android.graphics.Path;
+import android.graphics.PointF;
 import android.graphics.PorterDuff;
 import android.graphics.Rect;
 import android.graphics.RectF;
@@ -193,6 +194,7 @@ import android.view.inputmethod.ExtractedTextRequest;
 import android.view.inputmethod.HandwritingGesture;
 import android.view.inputmethod.InputConnection;
 import android.view.inputmethod.InputMethodManager;
+import android.view.inputmethod.InsertGesture;
 import android.view.inputmethod.SelectGesture;
 import android.view.inspector.InspectableProperty;
 import android.view.inspector.InspectableProperty.EnumEntry;
@@ -9311,6 +9313,31 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
         return 0;
     }
 
+    /** @hide */
+    public int performHandwritingInsertGesture(@NonNull InsertGesture gesture) {
+        PointF point = gesture.getInsertionPoint();
+        // The coordinates provided are screen coordinates - transform to content coordinates.
+        int[] screenToViewport = getLocationOnScreen();
+        point.offset(
+                -(screenToViewport[0] + viewportToContentHorizontalOffset()),
+                -(screenToViewport[1] + viewportToContentVerticalOffset()));
+
+        int line = mLayout.getLineForVertical((int) point.y);
+        if (point.y < mLayout.getLineTop(line)
+                || point.y > mLayout.getLineBottomWithoutSpacing(line)) {
+            return handleGestureFailure(gesture);
+        }
+        if (point.x < mLayout.getLineLeft(line) || point.x > mLayout.getLineRight(line)) {
+            return handleGestureFailure(gesture);
+        }
+        int offset = mLayout.getOffsetForHorizontal(line, point.x);
+        String textToInsert = gesture.getTextToInsert();
+        getEditableText().insert(offset, textToInsert);
+        Selection.setSelection(getEditableText(), offset + textToInsert.length());
+        // TODO: Insert extra spaces if necessary.
+        return 0;
+    }
+
     private int handleGestureFailure(HandwritingGesture gesture) {
         if (!TextUtils.isEmpty(gesture.getFallbackText())) {
             getEditableText()
diff --git a/core/java/com/android/internal/inputmethod/EditableInputConnection.java b/core/java/com/android/internal/inputmethod/EditableInputConnection.java
index 5393db8335cfa..9211926c51e2e 100644
--- a/core/java/com/android/internal/inputmethod/EditableInputConnection.java
+++ b/core/java/com/android/internal/inputmethod/EditableInputConnection.java
@@ -40,6 +40,7 @@ import android.view.inputmethod.ExtractedText;
 import android.view.inputmethod.ExtractedTextRequest;
 import android.view.inputmethod.HandwritingGesture;
 import android.view.inputmethod.InputConnection;
+import android.view.inputmethod.InsertGesture;
 import android.view.inputmethod.SelectGesture;
 import android.widget.TextView;
 
@@ -274,6 +275,8 @@ public final class EditableInputConnection extends BaseInputConnection
             result = mTextView.performHandwritingSelectGesture((SelectGesture) gesture);
         } else if (gesture instanceof DeleteGesture) {
             result = mTextView.performHandwritingDeleteGesture((DeleteGesture) gesture);
+        } else if (gesture instanceof InsertGesture) {
+            result = mTextView.performHandwritingInsertGesture((InsertGesture) gesture);
         } else {
             result = 0;
         }