diff --git a/src/timer.rs b/src/timer.rs
index 053f1aa..570dec1 100644
--- a/src/timer.rs
+++ b/src/timer.rs
@@ -1,6 +1,7 @@
 use std::rc::{Rc, Weak};
 use std::cell::RefCell;
 use std::any::Any;
+use std::cmp;
 
 const TVN_BITS: usize = 6;
 const TVR_BITS: usize = 8;
@@ -367,23 +368,58 @@ impl Timer {
     }
 
     pub fn fire_event(&mut self,
-                      _timer_wp: TimerWp,
-                      _e: i32,
-                      _args: Option<Vec<Rc::<dyn Any>>>) {
+                      timer_wp: TimerWp,
+                      e: TimerEvent,
+                      args: Option<Vec<Rc::<dyn Any>>>) {
+        match timer_wp.upgrade() {
+            Some(t) => {
+                match &mut t.borrow_mut().cb {
+                    Some(cb) => {
+                        (*cb)(e, args);
+                    }
+                    None => {
+                    }
+                }
+            }
+            None => {
+            }
+        }
     }
 
-    pub fn modify(&mut self, _timer_wp: TimerWp, _expire_time: i32) {
+    pub fn modify(&mut self, timer_wp: TimerWp, expire_time: i32) {
+        match timer_wp.upgrade() {
+            Some(_) => {
+                self.modify(timer_wp, expire_time);
+            }
+            None => {
+            }
+        }
     }
 
     pub fn delete_current_timer(&mut self) {
+        match self.running_timer.upgrade() {
+            Some(v) => {
+                self.internal_delete(Rc::downgrade(&v.borrow().wp), false);
+            }
+            None => {
+            }
+        }
     }
 
-    pub fn is_running(&self) {
+    pub fn is_running(&self) -> bool {
+        match self.running_timer.upgrade() {
+            Some(_) => {
+                return true;
+            }
+            None => {
+                return false;
+            }
+        }
     }
 
     pub fn delete(&mut self, timer_wp: TimerWp) {
         match timer_wp.upgrade() {
-            Some(v) => {
+            Some(_) => {
                 self.internal_delete(timer_wp, false);
             }
             None => {
@@ -391,11 +427,16 @@ impl Timer {
         }
     }
 
-    pub fn reset(&mut self, _timer_wp: TimerWp) {
-    }
-
-    pub fn get_remain_time(&mut self, _timer_wp: TimerWp) -> i64 {
-        return 0;
+    pub fn get_remain_time(&mut self, timer_wp: TimerWp) -> i64 {
+        match timer_wp.upgrade() {
+            Some(t) => {
+                let remain_time = t.borrow().expires - (self.get_tick_count)();
+                return cmp::max(remain_time, 0);
+            }
+            None => {
+                return 0;
+            }
+        }
     }
 
     pub fn get_idle_time(&self) -> i64 {