Mouse_Events tutorial: add section about AWT's MouseEvent (#455)

tutorials/Mouse_Events/README.md

@@ -140,4 +140,58 @@ fun main() = Window(title = "Compose for Desktop", size = IntSize(400, 400)) {
     }
 }
 ```
-![Application running](mouse_enter.gif)
+![Application running](mouse_enter.gif)
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+
+### Mouse right/middle clicks and keyboard modifiers
+
+While first-class support for pointer type-specific data, like pressed mouse buttons, is still in development in Compose, there is an available raw AWT mouse event object in Compose for Desktop, that can be used as a workaround when you need advanced functionality.
+
+```kotlin
+import androidx.compose.desktop.Window
+import androidx.compose.foundation.gestures.forEachGesture
+import androidx.compose.foundation.layout.Column
+import androidx.compose.material.Text
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.pointer.AwaitPointerEventScope
+import androidx.compose.ui.input.pointer.PointerEvent
+import androidx.compose.ui.input.pointer.changedToDown
+import androidx.compose.ui.input.pointer.consumeDownChange
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.unit.IntSize
+import java.awt.event.MouseEvent
+
+fun main() = Window(title = "Compose for Desktop", size = IntSize(400, 400)) {
+    var lastEvent by remember { mutableStateOf<MouseEvent?>(null) }
+    Column {
+        Text(
+            text = "Custom button",
+            modifier = Modifier.pointerInput(Unit) {
+                forEachGesture {
+                    awaitPointerEventScope {
+                        lastEvent = awaitEventFirstDown().also {
+                            it.changes.forEach { it.consumeDownChange() }
+                        }.mouseEvent
+                    }
+                }
+            }
+        )
+        Text("Mouse event: ${lastEvent?.paramString()}")
+    }
+
+}
+
+private suspend fun AwaitPointerEventScope.awaitEventFirstDown(): PointerEvent {
+    var event: PointerEvent
+    do {
+        event = awaitPointerEvent()
+    } while (
+        !event.changes.all { it.changedToDown() }
+    )
+    return event
+}
+```
+![Application running](mouse_event.gif)
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