Commit f11993b2 authored by Pavel Reznikov's avatar Pavel Reznikov
Browse files

add gridstack.js

parent 4576db23
(function (scope, _) {
var Utils = {
is_intercepted: function (a, b) {
return !(a.x + a.width <= b.x || b.x + b.width <= a.x || a.y + a.height <= b.y || b.y + b.height <= a.y);
}
};
var id_seq = 0;
var GridStackEngine = function (width, onchange) {
this.width = width;
this.nodes = [];
this.onchange = onchange || function () {};
};
GridStackEngine.prototype._fix_collisions = function (node) {
this.nodes = _.sortBy(this.nodes, function (n) { return -(n.x + n.y * this.width); }, this);
while (true) {
var collision_node = _.find(this.nodes, function (n) {
return n != node && Utils.is_intercepted(n, node);
}, this);
if (typeof collision_node == 'undefined') {
return;
}
this.move_node(collision_node, collision_node.x, node.y + node.height,
collision_node.width, collision_node.height, true);
}
};
GridStackEngine.prototype._pack_nodes = function () {
this.nodes = _.sortBy(this.nodes, function (n) { return n.x + n.y * this.width; }, this);
_.each(this.nodes, function (n, i) {
while (n.y > 0) {
var new_y = n.y - 1;
var can_be_moved = i == 0;
if (i > 0) {
var collision_node = _.chain(this.nodes)
.first(i)
.find(function (bn) {
return Utils.is_intercepted({x: n.x, y: new_y, width: n.width, height: n.height}, bn);
})
.value();
can_be_moved = typeof collision_node == 'undefined';
}
if (!can_be_moved) {
break;
}
n.y = new_y;
}
}, this);
};
GridStackEngine.prototype._prepare_node = function (node, moving) {
node = _.defaults(node || {}, {width: 1, height: 1, x: 0, y: 0 });
node.x = parseInt('' + node.x);
node.y = parseInt('' + node.y);
node.width = parseInt('' + node.width);
node.height = parseInt('' + node.height);
if (node.width > this.width) {
node.width = this.width;
}
else if (node.width < 1) {
node.width = 1;
}
if (node.height < 1) {
node.height = 1;
}
if (node.x < 0) {
node.x = 0;
}
if (node.x + node.width > this.width) {
if (moving) {
node.x = this.width - node.width;
}
else {
node.width = this.width - node.x;
}
}
if (node.y < 0) {
node.y = 0;
}
return node;
};
GridStackEngine.prototype._notify = function () {
this.onchange(this.nodes);
};
GridStackEngine.prototype.add_node = function(node) {
node = this._prepare_node(node);
if (typeof node.max_width != 'undefined') node.width = Math.min(node.width, node.max_width);
if (typeof node.max_height != 'undefined') node.height = Math.min(node.height, node.max_height);
if (typeof node.min_width != 'undefined') node.width = Math.max(node.width, node.min_width);
if (typeof node.min_height != 'undefined') node.height = Math.max(node.height, node.min_height);
node._id = ++id_seq;
this.nodes.push(node);
this._fix_collisions(node);
this._pack_nodes();
this._notify();
return node;
};
GridStackEngine.prototype.remove_node = function (node) {
node._id = null;
this.nodes = _.without(this.nodes, node);
this._pack_nodes();
this._notify(node);
};
GridStackEngine.prototype.move_node = function (node, x, y, width, height, no_pack) {
if (typeof x == 'undefined') x = node.x;
if (typeof y == 'undefined') y = node.y;
if (typeof width == 'undefined') width = node.width;
if (typeof height == 'undefined') height = node.height;
if (typeof node.max_width != 'undefined') width = Math.min(width, node.max_width);
if (typeof node.max_height != 'undefined') height = Math.min(height, node.max_height);
if (typeof node.min_width != 'undefined') width = Math.max(width, node.min_width);
if (typeof node.min_height != 'undefined') height = Math.max(height, node.min_height);
if (node.x == x && node.y == y && node.width == width && node.height == height) {
return node;
}
var moving = node.x != x;
node.x = x;
node.y = y;
node.width = width;
node.height = height;
node = this._prepare_node(node, moving);
this._fix_collisions(node);
if (!no_pack) {
this._pack_nodes();
this._notify();
}
return node;
};
GridStackEngine.prototype.get_grid_height = function () {
return _.reduce(this.nodes, function (memo, n) { return Math.max(memo, n.y + n.height); }, 0);
};
var GridStack = function (el, opts) {
var self = this;
this.container = $(el);
this.opts = _.defaults(opts || {}, {
width: 12,
item_class: 'grid-stack-item',
placeholder_class: 'grid-stack-placeholder',
handle: '.grid-stack-item-content',
cell_height: 60,
vertical_margin: 20
});
this.grid = new GridStackEngine(this.opts.width, function (nodes) {
_.each(nodes, function (n) {
n.el
.attr('data-gs-x', n.x)
.attr('data-gs-y', n.y)
.attr('data-gs-width', n.width)
.attr('data-gs-height', n.height);
});
});
this.container.find('.' + this.opts.item_class).each(function (index, el) {
self._prepare_element(el);
});
this.placeholder = $('<div class="' + this.opts.placeholder_class + ' ' + this.opts.item_class + '"><div class="placeholder-content" /></div>').hide();
this.container.append(this.placeholder);
this.container.height((this.grid.get_grid_height()) * (this.opts.cell_height + this.opts.vertical_margin) - this.opts.vertical_margin);
};
GridStack.prototype._update_container_height = function () {
this.container.height(this.grid.get_grid_height() * (this.opts.cell_height + this.opts.vertical_margin) - this.opts.vertical_margin);
};
GridStack.prototype._prepare_element = function (el) {
var self = this;
el = $(el);
var node = self.grid.add_node({
x: el.attr('data-gs-x'),
y: el.attr('data-gs-y'),
width: el.attr('data-gs-width'),
height: el.attr('data-gs-height'),
max_width: el.attr('data-gs-max-width'),
min_width: el.attr('data-gs-min-width'),
max_height: el.attr('data-gs-max-height'),
min_height: el.attr('data-gs-min-height'),
el: el
});
el.data('_gridstack_node', node);
var cell_width, cell_height = this.opts.cell_height + this.opts.vertical_margin / 2;
var on_start_moving = function (event, ui) {
var o = $(this);
cell_width = Math.ceil(o.outerWidth() / o.attr('data-gs-width'));
self.placeholder
.attr('data-gs-x', o.attr('data-gs-x'))
.attr('data-gs-y', o.attr('data-gs-y'))
.attr('data-gs-width', o.attr('data-gs-width'))
.attr('data-gs-height', o.attr('data-gs-height'))
.show();
node.el = self.placeholder;
};
var on_end_moving = function (event, ui) {
var o = $(this);
node.el = o;
self.placeholder.hide();
o
.attr('data-gs-x', node.x)
.attr('data-gs-y', node.y)
.attr('data-gs-width', node.width)
.attr('data-gs-height', node.height)
.removeAttr('style');
self._update_container_height();
};
el.draggable({
handle: this.opts.handle,
scroll: true,
appendTo: 'body',
start: on_start_moving,
stop: on_end_moving,
drag: function (event, ui) {
var x = Math.round(ui.position.left / cell_width),
y = Math.floor(ui.position.top / cell_height);
self.grid.move_node(node, x, y);
self._update_container_height();
}
}).resizable({
autoHide: true,
handles: 'se',
minHeight: this.opts.cell_height - 10,
minWidth: 70,
start: on_start_moving,
stop: on_end_moving,
resize: function (event, ui) {
var width = Math.round(ui.size.width / cell_width),
height = Math.round(ui.size.height / cell_height);
self.grid.move_node(node, node.x, node.y, width, height);
self._update_container_height();
}
});
};
GridStack.prototype.add_widget = function (el, x, y, width, height) {
el = $(el);
if (typeof x != 'undefined') el.attr('data-gs-x', x);
if (typeof y != 'undefined') el.attr('data-gs-y', y);
if (typeof width != 'undefined') el.attr('data-gs-width', width);
if (typeof height != 'undefined') el.attr('data-gs-height', height);
this.container.append(el);
this._prepare_element(el);
};
GridStack.prototype.remove_widget = function (el) {
var node = $(el).data('_gridstack_node');
this.grid.remove_node(node);
el.remove();
};
scope.GridStackUI = GridStack;
$.fn.gridstack = function (opts) {
return this.each(function () {
if (!$(this).data('_gridstack')) {
$(this).data('_gridstack', new GridStack(this, opts));
}
});
};
})(window, _);
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