# all files / diagram-js/lib/features/hand-tool/ HandTool.js

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     import { hasPrimaryModifier } from '../../util/Mouse';

    import { isKey } from '../../features/keyboard/KeyboardUtil';

    var HIGH_PRIORITY = 1500;
    var HAND_CURSOR = 'grab';

    export default function HandTool(eventBus, canvas, dragging, injector, toolManager) {
      this._dragging = dragging;

      var self = this,
          keyboard = injector.get('keyboard', false);

      toolManager.registerTool('hand', {
        tool: 'hand',
        dragging: 'hand.move'
      });

      eventBus.on('element.mousedown', HIGH_PRIORITY, function(event) {
        if (hasPrimaryModifier(event)) {
          this.activateMove(event.originalEvent);

          return false;
        }
      }, this);

      keyboard && keyboard.addListener(HIGH_PRIORITY, function(e) {
        Eif (!isSpace(e.keyEvent)) {
          return;
        }

        if (self.isActive()) {
          return;
        }

        function activateMove(event) {
          self.activateMove(event);

          window.removeEventListener('mousemove', activateMove);
        }

        window.addEventListener('mousemove', activateMove);

        function deactivateMove(e) {
          if (!isSpace(e.keyEvent)) {
            return;
          }

          window.removeEventListener('mousemove', activateMove);

          keyboard.removeListener(deactivateMove, 'keyboard.keyup');

          dragging.cancel();
        }

        keyboard.addListener(HIGH_PRIORITY, deactivateMove, 'keyboard.keyup');
      }, 'keyboard.keydown');

      eventBus.on('hand.end', function(event) {
        var target = event.originalEvent.target;

        // only reactive on diagram click
        // on some occasions, event.hover is not set and we have to check if the target is an svg
        if (!event.hover && !(target instanceof SVGElement)) {
          return false;
        }

        eventBus.once('hand.ended', function() {
          this.activateMove(event.originalEvent, { reactivate: true });
        }, this);

      }, this);

      eventBus.on('hand.move.move', function(event) {
        var scale = canvas.viewbox().scale;

        canvas.scroll({
          dx: event.dx * scale,
          dy: event.dy * scale
        });
      });

      eventBus.on('hand.move.end', function(event) {
        var context = event.context,
            reactivate = context.reactivate;

        // Don't reactivate if the user is using the keyboard keybinding
        if (!hasPrimaryModifier(event) && reactivate) {

          eventBus.once('hand.move.ended', function(event) {
            this.activateHand(event.originalEvent, true, true);
          }, this);

        }

        return false;
      }, this);

    }

    HandTool.$inject = [
      'eventBus',
      'canvas',
      'dragging',
      'injector',
      'toolManager'
    ];

    HandTool.prototype.activateMove = function(event, autoActivate, context) {
      if (typeof autoActivate === 'object') {
        context = autoActivate;
        autoActivate = false;
      }

      this._dragging.init(event, 'hand.move', {
        autoActivate: autoActivate,
        cursor: HAND_CURSOR,
        data: {
          context: context || {}
        }
      });
    };

    HandTool.prototype.activateHand = function(event, autoActivate, reactivate) {
      this._dragging.init(event, 'hand', {
        trapClick: false,
        autoActivate: autoActivate,
        cursor: HAND_CURSOR,
        data: {
          context: {
            reactivate: reactivate
          }
        }
      });
    };

    HandTool.prototype.toggle = function() {
      if (this.isActive()) {
        this._dragging.cancel();
      } else {
        this.activateHand();
      }
    };

    HandTool.prototype.isActive = function() {
      var context = this._dragging.context();

      if (context) {
        return /^(hand|hand\.move)$/.test(context.prefix);
      }

      return false;
    };

    // helpers //////////

    function isSpace(keyEvent) {
      return isKey(' ', keyEvent);
    }