add NextCheckKeyIsLong() and EnqueueKey() methods

NextCheckKeyIsLong() is called right before each call to CheckKey() to
tell the implementation if the key is a long-press or not.  (To be
used on devices with few buttons.)  It's done as a separate method
(rather than a parameter to CheckKey) to not break existing recovery
UI implementations.

EnqueueKey() can be called from CheckKey() to put arbitrary code codes
in the synchronous queue (to be processed by HandleMenuKey).

Change-Id: If8a83d66efe0bbc9e2dc178e5ebe12acd216324b

1 files changed, 28 insertions, 9 deletions

diff --git a/ui.cpp b/ui.cpp
index bd0fcae..65f4028 100644
--- a/ui.cpp
+++ b/ui.cpp
@@ -45,7 +45,8 @@ static RecoveryUI* self = NULL;
 
 RecoveryUI::RecoveryUI() :
     key_queue_len(0),
-    key_last_down(-1) {
+    key_last_down(-1),
+    key_down_time(0) {
     pthread_mutex_init(&key_queue_mutex, NULL);
     pthread_cond_init(&key_queue_cond, NULL);
     self = this;
@@ -109,19 +110,29 @@ int RecoveryUI::input_callback(int fd, short revents, void* data)
 // updown == 1 for key down events; 0 for key up events
 void RecoveryUI::process_key(int key_code, int updown) {
     bool register_key = false;
+    bool long_press = false;
+
+    const long long_threshold = CLOCKS_PER_SEC * 750 / 1000;
 
     pthread_mutex_lock(&key_queue_mutex);
     key_pressed[key_code] = updown;
     if (updown) {
         key_last_down = key_code;
+        key_down_time = clock();
     } else {
-        if (key_last_down == key_code)
+        if (key_last_down == key_code) {
+            long duration = clock() - key_down_time;
+            if (duration > long_threshold) {
+                long_press = true;
+            }
             register_key = true;
+        }
         key_last_down = -1;
     }
     pthread_mutex_unlock(&key_queue_mutex);
 
     if (register_key) {
+        NextCheckKeyIsLong(long_press);
         switch (CheckKey(key_code)) {
           case RecoveryUI::IGNORE:
             break;
@@ -135,18 +146,23 @@ void RecoveryUI::process_key(int key_code, int updown) {
             break;
 
           case RecoveryUI::ENQUEUE:
-            pthread_mutex_lock(&key_queue_mutex);
-            const int queue_max = sizeof(key_queue) / sizeof(key_queue[0]);
-            if (key_queue_len < queue_max) {
-                key_queue[key_queue_len++] = key_code;
-                pthread_cond_signal(&key_queue_cond);
-            }
-            pthread_mutex_unlock(&key_queue_mutex);
+            EnqueueKey(key_code);
             break;
         }
     }
 }
 
+void RecoveryUI::EnqueueKey(int key_code) {
+    pthread_mutex_lock(&key_queue_mutex);
+    const int queue_max = sizeof(key_queue) / sizeof(key_queue[0]);
+    if (key_queue_len < queue_max) {
+        key_queue[key_queue_len++] = key_code;
+        pthread_cond_signal(&key_queue_cond);
+    }
+    pthread_mutex_unlock(&key_queue_mutex);
+}
+
+
 // Reads input events, handles special hot keys, and adds to the key queue.
 void* RecoveryUI::input_thread(void *cookie)
 {
@@ -223,3 +239,6 @@ void RecoveryUI::FlushKeys() {
 RecoveryUI::KeyAction RecoveryUI::CheckKey(int key) {
     return RecoveryUI::ENQUEUE;
 }
+
+void RecoveryUI::NextCheckKeyIsLong(bool is_long_press) {
+}