/*
  This file is part of Badaap Comic Reader.
  
  Copyright (c) 2012 Jeroen Walter
  
  Badaap Comic Reader is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  Badaap Comic Reader is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with Badaap Comic Reader.  If not, see <http://www.gnu.org/licenses/>.
*/  
/*
  This fixes the directionLock behaviour.
  The problem was that if the scroller was enabled for both directions, then
  the direction lock didn't do anything, i.e. if enabled you could still scroll 
  in both directions.
      
*/

alert('Comic.Scrollerfix loaded');

Ext.define('Comic.Scrollerfix', {
    override: 'Ext.scroll.Scroller',
    onDragStart: function(e) {
    
        var direction = this.getDirection(),
            absDeltaX = e.absDeltaX,
            absDeltaY = e.absDeltaY,
            directionLock = this.getDirectionLock(),
            startPosition = this.startPosition,
            flickStartPosition = this.flickStartPosition,
            flickStartTime = this.flickStartTime,
            lastDragPosition = this.lastDragPosition,
            currentPosition = this.position,
            dragDirection = this.dragDirection,
            x = currentPosition.x,
            y = currentPosition.y,
            now = Ext.Date.now();

        this.isDragging = true;

        
        this.axisDragLockX = directionLock && (absDeltaX > absDeltaY);
        this.axisDragLockY = directionLock && (absDeltaY > absDeltaX);
        
        if (directionLock && direction !== 'both') {
            if ((direction === 'horizontal' && absDeltaX > absDeltaY)
                    || (direction === 'vertical' && absDeltaY > absDeltaX)) {
                e.stopPropagation();
            }
            else {
                this.isDragging = false;
                return;
            }
        }

        lastDragPosition.x = x;
        lastDragPosition.y = y;

        flickStartPosition.x = x;
        flickStartPosition.y = y;

        startPosition.x = x;
        startPosition.y = y;

        flickStartTime.x = now;
        flickStartTime.y = now;

        dragDirection.x = 0;
        dragDirection.y = 0;

        this.dragStartTime = now;

        this.isDragging = true;

        this.fireEvent('scrollstart', this, x, y);
    },
    
    onAxisDrag: function(axis, delta) {
        if (axis == 'x' && this.axisDragLockY)
        {
          return;
        }
        if (axis == 'y' && this.axisDragLockX)
        {
          return;
        }
          
        if (!this.isAxisEnabled(axis)) {
            return;
        }

        var flickStartPosition = this.flickStartPosition,
            flickStartTime = this.flickStartTime,
            lastDragPosition = this.lastDragPosition,
            dragDirection = this.dragDirection,
            old = this.position[axis],
            min = this.getMinPosition()[axis],
            max = this.getMaxPosition()[axis],
            start = this.startPosition[axis],
            last = lastDragPosition[axis],
            current = start - delta,
            lastDirection = dragDirection[axis],
            restrictFactor = this.getOutOfBoundRestrictFactor(),
            startMomentumResetTime = this.getStartMomentumResetTime(),
            now = Ext.Date.now(),
            distance;

        if (current < min) {
            current *= restrictFactor;
        }
        else if (current > max) {
            distance = current - max;
            current = max + distance * restrictFactor;
        }

        if (current > last) {
            dragDirection[axis] = 1;
        }
        else if (current < last) {
            dragDirection[axis] = -1;
        }

        if ((lastDirection !== 0 && (dragDirection[axis] !== lastDirection))
                || (now - flickStartTime[axis]) > startMomentumResetTime) {
            flickStartPosition[axis] = old;
            flickStartTime[axis] = now;
        }

        lastDragPosition[axis] = current;
    }
});