From 0b87d79eb59165638611e57dfb44b148ea1a6931 Mon Sep 17 00:00:00 2001
From: Fabian Vogt <fabian@ritter-vogt.de>
Date: Tue, 4 Feb 2025 21:06:55 +0100
Subject: [PATCH] [Android] Simple haptic feedback

HapticFeedbackConstants.KEYBOARD_TAP on all keypress and touchpad down
events triggered by QML.

Fixes #115
---
 core/os/os-android.cpp | 30 ++++++++++++++++++++++++++++++
 core/os/os.h           |  2 ++
 qmlbridge.cpp          | 10 ++++++++++
 3 files changed, 42 insertions(+)

diff --git a/core/os/os-android.cpp b/core/os/os-android.cpp
index 3d03318e..d7a4921e 100644
--- a/core/os/os-android.cpp
+++ b/core/os/os-android.cpp
@@ -155,3 +155,33 @@ char *android_basename(const char *path)
 
     return nullptr;
 }
+
+void androidVibrate()
+{
+    QAndroidJniEnvironment env;
+
+    // Call activity.getWindow().getDecorView().perforHapticFeedback(KEYBOARD_TAP);
+    QAndroidJniObject window = QtAndroid::androidActivity()
+            .callObjectMethod("getWindow", "()Landroid/view/Window;");
+
+    QAndroidJniObject decorView = window.callObjectMethod("getDecorView", "()Landroid/view/View;");
+
+    if (env->ExceptionCheck())
+    {
+        env->ExceptionDescribe();
+        env->ExceptionClear();
+        return;
+    }
+
+    bool success = decorView.callMethod<jboolean>("performHapticFeedback", "(I)Z", 3); // HapticFeedbackConstants.KEYBOARD_TAP
+
+    if (env->ExceptionCheck())
+    {
+        env->ExceptionDescribe();
+        env->ExceptionClear();
+        return;
+    }
+
+    if (!success)
+        qInfo() << "Haptic feedback failed";
+}
diff --git a/core/os/os.h b/core/os/os.h
index 703f512c..a5bf3445 100644
--- a/core/os/os.h
+++ b/core/os/os.h
@@ -25,6 +25,8 @@ FILE *fopen_utf8(const char *filename, const char *mode);
 #if defined(__ANDROID__)
 /* Returns an allocated string or NULL on failure. */
 char *android_basename(const char *path);
+/* KEYBOARD_TAP vibration for the current View. */
+void androidVibrate();
 #endif
 
 void *os_reserve(size_t size);
diff --git a/qmlbridge.cpp b/qmlbridge.cpp
index 2b916c31..184c08a3 100644
--- a/qmlbridge.cpp
+++ b/qmlbridge.cpp
@@ -256,6 +256,11 @@ void QMLBridge::setButtonState(int id, bool state)
 {
     int col = id % KEYPAD_COLS, row = id / KEYPAD_COLS;
 
+#ifdef Q_OS_ANDROID
+    if (state)
+        androidVibrate();
+#endif
+
     ::keypad_set_key(row, col, state);
 }
 
@@ -263,6 +268,11 @@ void QMLBridge::setTouchpadState(qreal x, qreal y, bool contact, bool down)
 {
     ::touchpad_set_state(x, y, contact, down);
 
+#ifdef Q_OS_ANDROID
+    if (down)
+        androidVibrate();
+#endif
+
     touchpadStateChanged();
 }