DragState.js
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/**
* DragState
* an object that handles dragging events
*
* This object is used by the built-in selection object to
* track a dragging operation on a selection
*/
// var DragState = function(e,selection,ord){{{
var DragState = function(e,selection,ord){
var t = this;
t.x = e.pageX;
t.y = e.pageY;
t.selection = selection;
t.eventTarget = selection.core.opt.dragEventTarget;
t.orig = selection.get();
selection.callFilterFunction('refresh');
var p = selection.core.container.position();
t.elx = p.left;
t.ely = p.top;
t.offsetx = 0;
t.offsety = 0;
t.ord = ord;
t.opposite = t.getOppositeCornerOffset();
t.initEvents(e);
};
// }}}
DragState.prototype = {
// getOppositeCornerOffset: function(){{{
// Calculate relative offset of locked corner
getOppositeCornerOffset: function(){
var o = this.orig;
var relx = this.x - this.elx - o.x;
var rely = this.y - this.ely - o.y;
switch(this.ord){
case 'nw':
case 'w':
return [ o.w - relx, o.h - rely ];
return [ o.x + o.w, o.y + o.h ];
case 'sw':
return [ o.w - relx, -rely ];
return [ o.x + o.w, o.y ];
case 'se':
case 's':
case 'e':
return [ -relx, -rely ];
return [ o.x, o.y ];
case 'ne':
case 'n':
return [ -relx, o.h - rely ];
return [ o.w, o.y + o.h ];
}
return [ null, null ];
},
// }}}
// initEvents: function(e){{{
initEvents: function(e){
$(this.eventTarget)
.on('mousemove.jcrop',this.createDragHandler())
.on('mouseup.jcrop',this.createStopHandler());
},
// }}}
// dragEvent: function(e){{{
dragEvent: function(e){
this.offsetx = e.pageX - this.x;
this.offsety = e.pageY - this.y;
this.selection.updateRaw(this.getBox(),this.ord);
},
// }}}
// endDragEvent: function(e){{{
endDragEvent: function(e){
var sel = this.selection;
sel.core.container.removeClass('jcrop-dragging');
sel.element.trigger('cropend',[sel,sel.core.unscale(sel.get())]);
sel.focus();
},
// }}}
// createStopHandler: function(){{{
createStopHandler: function(){
var t = this;
return function(e){
$(t.eventTarget).off('.jcrop');
t.endDragEvent(e);
return false;
};
},
// }}}
// createDragHandler: function(){{{
createDragHandler: function(){
var t = this;
return function(e){
t.dragEvent(e);
return false;
};
},
// }}}
//update: function(x,y){{{
update: function(x,y){
var t = this;
t.offsetx = x - t.x;
t.offsety = y - t.y;
},
//}}}
//resultWrap: function(d){{{
resultWrap: function(d){
var b = {
x: Math.min(d[0],d[2]),
y: Math.min(d[1],d[3]),
x2: Math.max(d[0],d[2]),
y2: Math.max(d[1],d[3])
};
b.w = b.x2 - b.x;
b.h = b.y2 - b.y;
return b;
},
//}}}
//getBox: function(){{{
getBox: function(){
var t = this;
var o = t.orig;
var _c = { x2: o.x + o.w, y2: o.y + o.h };
switch(t.ord){
case 'n': return t.resultWrap([ o.x, t.offsety + o.y, _c.x2, _c.y2 ]);
case 's': return t.resultWrap([ o.x, o.y, _c.x2, t.offsety + _c.y2 ]);
case 'e': return t.resultWrap([ o.x, o.y, t.offsetx + _c.x2, _c.y2 ]);
case 'w': return t.resultWrap([ o.x + t.offsetx, o.y, _c.x2, _c.y2 ]);
case 'sw': return t.resultWrap([ t.offsetx + o.x, o.y, _c.x2, t.offsety + _c.y2 ]);
case 'se': return t.resultWrap([ o.x, o.y, t.offsetx + _c.x2, t.offsety + _c.y2 ]);
case 'ne': return t.resultWrap([ o.x, t.offsety + o.y, t.offsetx + _c.x2, _c.y2 ]);
case 'nw': return t.resultWrap([ t.offsetx + o.x, t.offsety + o.y, _c.x2, _c.y2 ]);
case 'move':
_c.nx = o.x + t.offsetx;
_c.ny = o.y + t.offsety;
return t.resultWrap([ _c.nx, _c.ny, _c.nx + o.w, _c.ny + o.h ]);
}
}
//}}}
};
Jcrop.registerComponent('DragState',DragState);