timers, part 1

dlanguilib.visualdproj

@@ -66,7 +66,7 @@
   <debuglevel>0</debuglevel>
   <debugids>DebugFocus</debugids>
   <versionlevel>0</versionlevel>
-  <versionids>EmbedStandardResources Unicode</versionids>
+  <versionids>EmbedStandardResources Unicode USE_SDL USE_FREETYPE</versionids>
   <dump_source>0</dump_source>
   <mapverbosity>0</mapverbosity>
   <createImplib>1</createImplib>

src/dlangui/core/logger.d

@@ -51,7 +51,7 @@ enum LogLevel : int {
 }
 
 /// Returns timestamp in milliseconds since 1970 UTC similar to Java System.currentTimeMillis()
-long currentTimeMillis() {
+@property long currentTimeMillis() {
     return std.datetime.Clock.currStdTime / 10000;
 }
 

src/dlangui/platforms/common/platform.d

@@ -86,6 +86,51 @@ class EventList {
     }
 }
 
+class TimerInfo {
+    static ulong nextId;
+
+    this(Widget targetWidget, long intervalMillis) {
+        _id = ++nextId;
+        assert(intervalMillis >= 0 && intervalMillis < 7*24*60*60*1000L);
+        _targetWidget = targetWidget;
+        _interval = intervalMillis;
+        _nextTimestamp = currentTimeMillis + _interval;
+    }
+    /// cancel timer
+    void cancel() {
+        _targetWidget = null;
+    }
+    /// cancel timer
+    void notify() {
+        if (_targetWidget) {
+            _nextTimestamp = currentTimeMillis + _interval;
+            if (!_targetWidget.onTimer(_id)) {
+                _targetWidget = null;
+            }
+        }
+    }
+    /// unique Id of timer
+    @property ulong id() { return _id; }
+    /// timer interval, milliseconds
+    @property long interval() { return _interval; }
+    /// next timestamp to invoke timer at, as per currentTimeMillis()
+    @property long nextTimestamp() { return _nextTimestamp; }
+    /// widget to route timer event to
+    @property Widget targetWidget() { return _targetWidget; }
+
+    protected ulong _id;
+    protected long _interval;
+    protected long _nextTimestamp;
+    protected Widget _targetWidget;
+}
+
+class TimerQueue {
+    protected TimerInfo[] _queue;
+    void add(TimerInfo event) {
+        int len = cast(int)_queue.length;
+    }
+}
+
 /**
  * Window abstraction layer. Widgets can be shown only inside window.
  * 

src/dlangui/widgets/widget.d

@@ -923,6 +923,12 @@ class Widget {
         return res;
     }
 
+    /// handle timer; return true to repeat timer event after next interval, false cancel timer
+    bool onTimer(ulong id) {
+        // override to do something useful
+        return false;
+    }
+
     /// map key to action
     Action findKeyAction(uint keyCode, uint flags) {
         Action action = _acceleratorMap.findByKey(keyCode, flags);