Intercept touch event to task list checkboxes to handle it before the cursor is moved

aztec/src/main/kotlin/org/wordpress/aztec/AztecText.kt

@@ -718,7 +718,41 @@ open class AztecText : AppCompatEditText, TextWatcher, UnknownHtmlSpan.OnUnknown
         return containingBoxBounds
     }
 
+    private fun getTaskListHandler(): TaskListClickHandler? {
+        return EnhancedMovementMethod.taskListClickHandler
+    }
+
     override fun onTouchEvent(event: MotionEvent): Boolean {
+        var x = event.x.toInt()
+        var y = event.y.toInt()
+
+        x -= totalPaddingLeft
+        y -= totalPaddingTop
+
+        x += scrollX
+        y += scrollY
+
+        // We check whether the user tap on a checkbox of a task list. The aztec text field should be enabled and we
+        // check whether the tap event was on the leading margin which is where the checkbox is located plus a padding
+        // space used to increase the target size for the tap event.
+        if (isEnabled &&
+            x + totalPaddingStart <= (blockFormatter.listStyleLeadingMargin() + AztecTaskListSpan.PADDING_SPACE)) {
+            val line = layout.getLineForVertical(y)
+            val off = layout.getOffsetForHorizontal(line, x.toFloat())
+            // If the tap event was on the leading margin, we double check whether we are tapping on a task list item.
+            // If that is true, then we return false because we don't want to propagate the tap event to stop moving
+            // the cursor to the item tapped.
+            if (getTaskListHandler()?.handleTaskListClick(
+                text,
+                off,
+                x,
+                totalPaddingStart
+            ) == true) {
+                refreshText(stealEditorFocus = false)
+                return false
+            }
+        }
+
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P
                 && event.action == MotionEvent.ACTION_DOWN) {
             // we'll use these values in OnLongClickListener

aztec/src/main/kotlin/org/wordpress/aztec/TaskListClickHandler.kt

@@ -8,7 +8,7 @@ import org.wordpress.aztec.spans.AztecTaskListSpan
 class TaskListClickHandler(val listStyle: BlockFormatter.ListStyle) {
     fun handleTaskListClick(text: Spannable, off: Int, x: Int, startMargin: Int): Boolean {
         // We want to make sure that text click will not trigger the checked change
-        if (x + startMargin > listStyle.leadingMargin()) return false
+        if (x + startMargin > (listStyle.leadingMargin() + AztecTaskListSpan.PADDING_SPACE)) return false
         val clickedList = text.getSpans(off, off, AztecTaskListSpan::class.java).firstOrNull()
         val clickedLines = text.getSpans(off, off, AztecListItemSpan::class.java)
         val clickedLine = clickedLines.find {

aztec/src/main/kotlin/org/wordpress/aztec/formatting/BlockFormatter.kt

@@ -80,6 +80,10 @@ class BlockFormatter(editor: AztecText,
         indentFormatter.outdent()
     }
 
+    fun listStyleLeadingMargin(): Int {
+        return listStyle.leadingMargin()
+    }
+
     fun isIndentAvailable(): Boolean {
         if (listFormatter.isIndentAvailable()) return true
         return indentFormatter.isIndentAvailable()

aztec/src/main/kotlin/org/wordpress/aztec/spans/AztecTaskListSpan.kt

@@ -144,4 +144,9 @@ open class AztecTaskListSpan(
     }
 
     override val textFormat: ITextFormat = AztecTextFormat.FORMAT_TASK_LIST
+
+    companion object {
+        // Extra padding added to the target tap area for checkboxes.
+        const val PADDING_SPACE = 15
+    }
 }

media-placeholders/src/main/java/org/wordpress/aztec/placeholders/ComposePlaceholderAdapter.kt

@@ -10,8 +10,5 @@ interface ComposePlaceholderAdapter : PlaceholderManager.PlaceholderAdapter {
      * @param attrs aztec attributes of the view
      */
     @Composable
-    fun Placeholder(
-        placeholderUuid: String,
-        attrs: AztecAttributes,
-    )
+    fun Placeholder(placeholderUuid: String, attrs: AztecAttributes)
 }

media-placeholders/src/main/java/org/wordpress/aztec/placeholders/ComposePlaceholderManager.kt

@@ -1,3 +1,5 @@
+@file:Suppress("ktlint")
+
 package org.wordpress.aztec.placeholders
 
 import android.graphics.Rect
@@ -101,7 +103,7 @@ class ComposePlaceholderManager(
                     .zIndex(9f)
                     .padding(
                         top = with(density) { composeView.topMargin.toDp() },
-                        start = with(density) { composeView.leftMargin.toDp() },
+                        start = with(density) { composeView.leftMargin.toDp() }
                     )
                     .width(
                         with(density) { composeView.width.toDp() }
@@ -113,7 +115,7 @@ class ComposePlaceholderManager(
                 key(composeView.uuid, composeView.width, composeView.height) {
                     adapters[composeView.adapterKey]?.Placeholder(
                         composeView.uuid,
-                        composeView.attrs,
+                        composeView.attrs
                     )
                 }
             }

media-placeholders/src/main/java/org/wordpress/aztec/placeholders/ViewPlaceholderManager.kt

@@ -96,7 +96,7 @@ class ViewPlaceholderManager(
      * @param type placeholder type
      * @param attributes other attributes passed to the view. For example a `src` for an image.
      */
-    override suspend fun insertItem(type: String, vararg attributes: Pair<String, String>) {
+    suspend override fun insertItem(type: String, vararg attributes: Pair<String, String>) {
         val adapter = adapters[type]
                 ?: throw IllegalArgumentException("Adapter for inserted type not found. Register it with `registerAdapter` method")
         val attrs = getAttributesForMedia(type, attributes)
@@ -113,7 +113,7 @@ class ViewPlaceholderManager(
      * @param shouldMergeItem this method should return true when the previous type is compatible and should be updated
      * @param updateItem function to update current parameters with new params
      */
-    override suspend fun insertOrUpdateItem(
+    suspend override fun insertOrUpdateItem(
             type: String,
             shouldMergeItem: (currentItemType: String) -> Boolean,
             updateItem: (
@@ -186,7 +186,7 @@ class ViewPlaceholderManager(
      * @param shouldUpdateItem This function should return true if the span can be updated, false if it should be removed
      * @param updateItem Function that updates the selected item
      */
-   override suspend fun removeOrUpdate(uuid: String, shouldUpdateItem: (Attributes) -> Boolean, updateItem: (currentAttributes: Map<String, String>) -> Map<String, String>): Boolean {
+    suspend override fun removeOrUpdate(uuid: String, shouldUpdateItem: (Attributes) -> Boolean, updateItem: (currentAttributes: Map<String, String>) -> Map<String, String>): Boolean {
         val currentItem = aztecText.editableText.getSpans(0, aztecText.length(), AztecPlaceholderSpan::class.java).find {
             it.attributes.getValue(UUID_ATTRIBUTE) == uuid
         } ?: return false