1. support long press like flutter

Author: Misko Lee

README.md

@@ -213,9 +213,16 @@ There are a bunch of signals to listen on each object... taken from AS3, and JS.
 - onMouseOver
 - onMouseOut
 - onMouseScroll
+- onLongPress(Duration duration,double distance)
 
 They all emit a `MouseInputData` with all the needed info inside, like stage coordinates, or translated local coordinates, which "mouse" button is pressed, etc.
 
+Specially on event `onLongPress`, the handler register function differcent others, it’s includes two params for configure the event, one of `Duration duration`, it’s mean keep press how long for trigg the event, another is `distance`. 
+
+Why need `distance` ?
+
+Beacuse of human can not keep static on screen, so, we are always trigged event `MouseMove`, but event `LongPress` will be cancelled automaticlly other event happed. It’s also mean when I pressed screen and other event happed before `duration`, So, it’s NOT LONG PRESS.
+
 ---
 
 ### Demos.

lib/src/core/scene_painter.dart

@@ -41,6 +41,7 @@ class ScenePainter with EventDispatcherMixin {
   /// Runs on the first "render".
   bool _isReady = false;
 
+
   bool get isReady => _isReady;
 
   /// Automatically manage the `tick()` and `render()` requests.

lib/src/display/display_object.dart

@@ -1,6 +1,8 @@
+import 'dart:async';
 import 'dart:ui' as ui;
 import 'package:flutter/foundation.dart';
 import 'package:flutter/painting.dart' as painting;
+import 'package:graphx/src/events/events.dart';
 import '../../graphx.dart';
 
 abstract class GDisplayObject
@@ -13,7 +15,7 @@ abstract class GDisplayObject
   static GDisplayObject $currentDrag;
   static GRect $currentDragBounds;
   GPoint _dragCenterOffset;
-
+  MouseInputData _lastMouseInput;
   /// Lets the user drag the specified sprite.
   /// The sprite remains draggable until explicitly stopped through a call to
   /// the Sprite.stopDrag() method, or until another sprite is made draggable.
@@ -75,6 +77,7 @@ abstract class GDisplayObject
 
   bool $debugBounds = false;
   bool mouseUseShape = false;
+  Timer _longPressTimer;
 
   List<GBaseFilter> $filters;
 
@@ -138,6 +141,15 @@ abstract class GDisplayObject
           $onMouseWheel?.dispatch(mouseInput);
           break;
         case MouseInputType.down:
+          if(_longPressTimer != null) {
+            _longPressTimer.cancel();
+            _longPressTimer = null;
+          }
+          if($onLongPress != null) {
+            _longPressTimer = Timer($onLongPress.configure[EventSignalConfKey.LongPressDuration], () {
+              $onLongPress?.dispatch(mouseInput);
+            });
+          }
           $mouseDownObj = object;
           $onMouseDown?.dispatch(mouseInput);
           break;
@@ -146,14 +158,29 @@ abstract class GDisplayObject
 //          $onRightMouseDown?.dispatch(mouseInput);
 //          break;
         case MouseInputType.move:
+          if(_lastMouseInput != null && $onLongPress != null) {
+            // ignore: lines_longer_than_80_chars
+            if((_lastMouseInput.localX - input.localX).abs() >
+                // ignore: lines_longer_than_80_chars
+                $onLongPress.configure[EventSignalConfKey.LongPressShakingDistance] ||
+                (_lastMouseInput.localY - input.localY).abs() >
+                    // ignore: lines_longer_than_80_chars
+                    $onLongPress.configure[EventSignalConfKey.LongPressShakingDistance]
+            ) {
+              _longPressTimer?.cancel();
+              _longPressTimer = null;
+            }
+          }
           $onMouseMove?.dispatch(mouseInput);
           break;
         case MouseInputType.up:
+          _longPressTimer?.cancel();
+          _longPressTimer = null;
+
           if ($mouseDownObj == object &&
               ($onMouseClick != null || $onMouseDoubleClick != null)) {
             var mouseClickInput = input.clone(this, object, MouseInputType.up);
             $onMouseClick?.dispatch(mouseClickInput);
-
             if ($lastClickTime > 0 &&
                 input.time - $lastClickTime < MouseInputData.doubleClickTime) {
               $onMouseDoubleClick?.dispatch(mouseClickInput);
@@ -166,13 +193,16 @@ abstract class GDisplayObject
           $onMouseUp?.dispatch(mouseInput);
           break;
         case MouseInputType.over:
+          _longPressTimer?.cancel();
           $mouseOverObj = object;
           if (useCursor && GMouse.isShowing()) {
             GMouse.setClickCursor();
           }
           $onMouseOver?.dispatch(mouseInput);
           break;
         case MouseInputType.out:
+          _longPressTimer?.cancel();
+          _longPressTimer = null;
           $mouseOverObj = null;
           if (useCursor && GMouse.isShowing()) {
             GMouse.cursor = null;
@@ -184,6 +214,7 @@ abstract class GDisplayObject
       }
     }
     $parent?.$dispatchMouseCallback(type, object, input);
+    _lastMouseInput = input.clone(this, object, type);
   }
 
   /// todo: add caching to local bounds (Rect).

lib/src/display/stage.dart

@@ -1,3 +1,4 @@
+import 'dart:async';
 import 'dart:ui' as ui;
 
 import '../../graphx.dart';
@@ -40,6 +41,7 @@ class Stage extends GDisplayObjectContainer
   ui.Paint _backgroundPaint;
   DisplayBoundsDebugger _boundsDebugger;
 
+
   /// Shortcut to access the owner [SceneController].
   SceneController get controller => scene.core;
 

lib/src/events/mixins.dart

@@ -125,6 +125,7 @@ mixin MouseSignalsMixin<T extends MouseInputData> {
   EventSignal<T> $onMouseOut;
   EventSignal<T> $onMouseOver;
   EventSignal<T> $onMouseWheel;
+  EventSignal<T> $onLongPress;
 
   EventSignal<T> get onMouseClick => $onMouseClick ??= EventSignal();
   EventSignal<T> get onMouseDoubleClick =>
@@ -137,6 +138,12 @@ mixin MouseSignalsMixin<T extends MouseInputData> {
   EventSignal<T> get onMouseOut => $onMouseOut ??= EventSignal();
   EventSignal<T> get onMouseScroll => $onMouseWheel ??= EventSignal();
 
+  EventSignal<T> onLongPress([Duration duration =
+  const Duration(milliseconds: 600),double distance = 1]) {
+    $onLongPress = EventSignal<T>.longPress(duration,distance);
+    return $onLongPress;
+  }
+
   void $disposePointerSignals() {
     $onRightMouseDown?.removeAll();
     $onRightMouseDown = null;
@@ -156,6 +163,8 @@ mixin MouseSignalsMixin<T extends MouseInputData> {
     $onMouseOut = null;
     $onMouseWheel?.removeAll();
     $onMouseWheel = null;
+    $onLongPress?.removeAll();
+    $onLongPress = null;
   }
 }
 

lib/src/events/signal.dart

@@ -64,7 +64,20 @@ class Signal {
   }
 }
 
+enum EventSignalConfKey {
+  LongPressDuration,
+  LongPressShakingDistance,
+}
+
 class EventSignal<T> {
+  Map<EventSignalConfKey,Object> configure = {};
+  EventSignal();
+ factory   EventSignal.longPress(Duration duration,double distance) {
+    var signal = EventSignal<T>();
+    signal.configure[EventSignalConfKey.LongPressDuration] = duration;
+    signal.configure[EventSignalConfKey.LongPressShakingDistance] = distance;
+    return signal;
+  }
   void call(EventSignalCallback<T> callback) {
     add(callback);
   }

lib/src/render/graphics.dart

@@ -700,7 +700,6 @@ class Graphics with RenderUtilMixin implements GxRenderable {
     }
     _constrainAlpha();
     if (!_isVisible) return;
-
     // trace("en", _drawingQueue.length);
     for (var graph in _drawingQueue) {
       if (graph.hasPicture) {

pubspec.lock

@@ -5,63 +5,63 @@ packages:
     dependency: transitive
     description:
       name: async
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "2.5.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "2.1.0"
   characters:
     dependency: transitive
     description:
       name: characters
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.1.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.2.0"
   clock:
     dependency: transitive
     description:
       name: clock
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.1.0"
   collection:
     dependency: transitive
     description:
       name: collection
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.15.0"
   convert:
     dependency: transitive
     description:
       name: convert
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "2.1.1"
   effective_dart:
     dependency: "direct dev"
     description:
       name: effective_dart
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.3.1"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.2.0"
   flutter:
@@ -78,49 +78,49 @@ packages:
     dependency: "direct main"
     description:
       name: http
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.13.1"
+    version: "0.13.3"
   http_parser:
     dependency: transitive
     description:
       name: http_parser
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "4.0.0"
   matcher:
     dependency: transitive
     description:
       name: matcher
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "0.12.10"
   meta:
     dependency: transitive
     description:
       name: meta
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.3.0"
   path:
     dependency: transitive
     description:
       name: path
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.8.0"
   pedantic:
     dependency: "direct dev"
     description:
       name: pedantic
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.11.0"
   petitparser:
     dependency: transitive
     description:
       name: petitparser
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "3.1.0"
   sky_engine:
@@ -132,63 +132,63 @@ packages:
     dependency: transitive
     description:
       name: source_span
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.8.0"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.10.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.1.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.2.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "0.2.19"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.3.0"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "2.1.0"
   xml:
     dependency: "direct main"
     description:
       name: xml
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "4.5.1"
 sdks: