net/systemeD/potlatch2/controller/DragSelection.as

   1 package net.systemeD.potlatch2.controller {
   2         import flash.events.*;
   3         import flash.geom.Point;
   4     import flash.ui.Keyboard;
   5     import net.systemeD.potlatch2.EditController;
   6     import net.systemeD.halcyon.connection.*;
   7     import net.systemeD.halcyon.connection.actions.*;
   8
   9     /** The state of moving a selection around with the mouse. */
  10     public class DragSelection extends ControllerState {
  11         private var isDraggingStarted:Boolean = false;
  12                 private var enterTime:Number;
  13
  14         private var downX:Number;
  15         private var downY:Number;
  16                 private var dragstate:uint=NOT_MOVED;
  17                 /** Not used? */
  18                 private const NOT_DRAGGING:uint=0;
  19
  20                 /** "Dragging" but hasn't actually moved yet. */
  21                 private const NOT_MOVED:uint=1;
  22
  23                 /** While moving. */
  24                 private const DRAGGING:uint=2;
  25
  26         /** Start the drag by recording the dragged way, where it started, and when. */
  27         public function DragSelection(sel:Array, event:MouseEvent) {
  28             selection = sel.concat();
  29             downX = event.localX;
  30             downY = event.localY;
  31                         enterTime = (new Date()).getTime();
  32         }
  33
  34        /** Handle dragging and end drag events. Filters out very short or quick drags. */
  35        override public function processMouseEvent(event:MouseEvent, entity:Entity):ControllerState {
  36             if (event.type==MouseEvent.MOUSE_UP) {
  37                 if (dragstate==DRAGGING) {
  38                                         var undo:CompositeUndoableAction = new CompositeUndoableAction("Move items");
  39                                         var lonDelta:Number = controller.map.coord2lon(downX)-controller.map.coord2lon(event.localX);
  40                                         var latDelta:Number = controller.map.coord2lat(downY)-controller.map.coord2lat(event.localY);
  41                                         var moved:Object = {};
  42                                         for each (var entity:Entity in selection) {
  43                                                 if (entity is Node) {
  44                                                         var node:Node=Node(entity);
  45                                                         node.setLatLon(node.lat-latDelta, node.lon-lonDelta, undo.push);
  46                                                         moved[node.id]=true;
  47                                                 } else if (entity is Way) {
  48                                                         undo.push(new MoveWayAction(Way(entity), latDelta, lonDelta, moved));
  49                                                 }
  50                                         }
  51                                         MainUndoStack.getGlobalStack().addAction(undo);
  52                 }
  53                                 return controller.findStateForSelection(selection);
  54
  55                         } else if ( event.type == MouseEvent.MOUSE_MOVE) {
  56                                 // dragging
  57                                 if (dragstate==NOT_DRAGGING) {
  58                                         return this;
  59                                 } else if (dragstate==NOT_MOVED &&
  60                                                ((Math.abs(downX - event.localX) < 3 && Math.abs(downY - event.localY) < 3) ||
  61                                                 (new Date().getTime()-enterTime)<300)) {
  62                                         return this;
  63                                 }
  64                                 dragstate=DRAGGING;
  65                 return dragTo(event);
  66
  67                         } else {
  68                                 // event not handled
  69                 return this;
  70                         }
  71         }
  72
  73                 /** Abort dragging if ESC pressed. */
  74                 override public function processKeyboardEvent(event:KeyboardEvent):ControllerState {
  75                         if (event.keyCode==Keyboard.ESCAPE) {
  76                                 for each (var entity:Entity in selection) {
  77                                         entity.dispatchEvent(new EntityDraggedEvent(Connection.ENTITY_DRAGGED, entity, 0, 0));
  78                                 }
  79                                 return controller.findStateForSelection(selection);
  80                         }
  81                         return this;
  82                 }
  83
  84         private function dragTo(event:MouseEvent):ControllerState {
  85                         for each (var entity:Entity in selection) {
  86                                 entity.dispatchEvent(new EntityDraggedEvent(Connection.ENTITY_DRAGGED, entity, event.localX-downX, event.localY-downY));
  87                         }
  88             return this;
  89         }
  90
  91                 public function forceDragStart():void {
  92                         dragstate=NOT_MOVED;
  93                 }
  94
  95         /** Highlight the dragged selection. */
  96         override public function enterState():void {
  97                         for each (var entity:Entity in selection) {
  98                                 editableLayer.setHighlight(entity, { selected: true });
  99                         }
 100         }
 101
 102         /** Un-highlight the dragged selection. */
 103         override public function exitState(newState:ControllerState):void {
 104                         for each (var entity:Entity in selection) {
 105                                 editableLayer.setHighlight(entity, { selected: false });
 106                         }
 107         }
 108         /** "DragSelection" */
 109         override public function toString():String {
 110             return "DragSelection";
 111         }
 112
 113
 114     }
 115 }