treegrid-dnd.js

(function($){
$.extend($.fn.treegrid.defaults, {
onBeforeDrag: function(row){}, // return false to deny drag
onStartDrag: function(row){},
onStopDrag: function(row){},
onDragEnter: function(targetRow, sourceRow){}, // return false to deny drop
onDragOver: function(targetRow, sourceRow){}, // return false to deny drop
onDragLeave: function(targetRow, sourceRow){},
onBeforeDrop: function(targetRow, sourceRow, point){},
onDrop: function(targetRow, sourceRow, point){} // point:'append','top','bottom'
});
$.extend($.fn.treegrid.methods, {
disableDnd:function(jq,id){
return jq.each(function() {
var target = this;
var state = $.data(this, 'treegrid');
state.disabledNodes = [];
var t = $(this);
var opts = state.options;
if (id) {
var nodes = opts.finder.getTr(target, id);
var rows = t.treegrid('getChildren', id);
for (var i = 0; i < rows.length; i++) {
nodes = nodes.add(opts.finder.getTr(target, rows[i][opts.idField]));
}
} else {
var nodes = t.treegrid('getPanel').find('tr[node-id]');
}
nodes.draggable({
disabled: true,
revert: true,
cursor: 'pointer'});
});
}
});
$.extend($.fn.treegrid.methods, {
enableDnd: function(jq, id){
if (!$('#treegrid-dnd-style').length){
$('head').append(
'<style id="treegrid-dnd-style">' +
'.treegrid-row-top td{border-top:1px solid red}' +
'.treegrid-row-bottom td{border-bottom:1px solid red}' +
'.treegrid-row-append .tree-title{border:1px solid red}' +
'</style>'
);
}
return jq.each(function(){
var target = this;
var state = $.data(this, 'treegrid');
state.disabledNodes = [];
var t = $(this);
var opts = state.options;
if (id){
var nodes = opts.finder.getTr(target, id);
var rows = t.treegrid('getChildren', id);
for(var i=0; i<rows.length; i++){
nodes = nodes.add(opts.finder.getTr(target, rows[i][opts.idField]));
}
} else {
var nodes = t.treegrid('getPanel').find('tr[node-id]');
}
nodes.draggable({
disabled:false,
revert:true,
cursor:'pointer',
proxy: function(source){
var row = t.treegrid('find', $(source).attr('node-id'));
var p = $('<div class="tree-node-proxy"></div>').appendTo('body');
p.html('<span class="tree-dnd-icon tree-dnd-no">&nbsp;</span>'+row[opts.treeField]);
p.hide();
return p;
},
deltaX: 15,
deltaY: 15,
onBeforeDrag:function(e){
if (opts.onBeforeDrag.call(target, getRow(this)) == false){return false}
if ($(e.target).hasClass('tree-hit') || $(e.target).parent().hasClass('datagrid-cell-check')){return false;}
if (e.which != 1){return false;}
$(this).next('tr.treegrid-tr-tree').find('tr[node-id]').droppable({accept:'no-accept'});
// var tr = opts.finder.getTr(target, $(this).attr('node-id'));
// var treeTitle = tr.find('span.tree-title');
// e.data.startX = treeTitle.offset().left;
// e.data.startY = treeTitle.offset().top;
// e.data.offsetWidth = 0;
// e.data.offsetHeight = 0;
},
onStartDrag:function(){
$(this).draggable('proxy').css({
left:-10000,
top:-10000
});
var row = getRow(this);
opts.onStartDrag.call(target, row);
state.draggingNodeId = row[opts.idField];
},
onDrag:function(e){
var x1=e.pageX,y1=e.pageY,x2=e.data.startX,y2=e.data.startY;
var d = Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
if (d>3){ // when drag a little distance, show the proxy object
$(this).draggable('proxy').show();
var tr = opts.finder.getTr(target, $(this).attr('node-id'));
var treeTitle = tr.find('span.tree-title');
e.data.startX = treeTitle.offset().left;
e.data.startY = treeTitle.offset().top;
e.data.offsetWidth = 0;
e.data.offsetHeight = 0;
}
this.pageY = e.pageY;
},
onStopDrag:function(){
$(this).next('tr.treegrid-tr-tree').find('tr[node-id]').droppable({accept:'tr[node-id]'});
for(var i=0; i<state.disabledNodes.length; i++){
var tr = opts.finder.getTr(target, state.disabledNodes[i]);
tr.droppable('enable');
}
state.disabledNodes = [];
var row = t.treegrid('find', state.draggingNodeId);
opts.onStopDrag.call(target, row);
}
}).droppable({
accept:'tr[node-id]',
onDragEnter: function(e, source){
if (opts.onDragEnter.call(target, getRow(this), getRow(source)) == false){
allowDrop(source, false);
var tr = opts.finder.getTr(target, $(this).attr('node-id'));
tr.removeClass('treegrid-row-append treegrid-row-top treegrid-row-bottom');
tr.droppable('disable');
state.disabledNodes.push($(this).attr('node-id'));
}
},
onDragOver:function(e,source){
var nodeId = $(this).attr('node-id');
if ($.inArray(nodeId, state.disabledNodes) >= 0){return}
var pageY = source.pageY;
var top = $(this).offset().top;
var bottom = top + $(this).outerHeight();

allowDrop(source, true);
var tr = opts.finder.getTr(target, nodeId);
tr.removeClass('treegrid-row-append treegrid-row-top treegrid-row-bottom');
if (pageY > top + (bottom - top) / 2){
if (bottom - pageY < 5){
tr.addClass('treegrid-row-bottom');
} else {
tr.addClass('treegrid-row-append');
}
} else {
if (pageY - top < 5){
tr.addClass('treegrid-row-top');
} else {
tr.addClass('treegrid-row-append');
}
}
if (opts.onDragOver.call(target, getRow(this), getRow(source)) == false){
allowDrop(source, false);
tr.removeClass('treegrid-row-append treegrid-row-top treegrid-row-bottom');
tr.droppable('disable');
state.disabledNodes.push(nodeId);
}
},
onDragLeave:function(e,source){
allowDrop(source, false);
var tr = opts.finder.getTr(target, $(this).attr('node-id'));
tr.removeClass('treegrid-row-append treegrid-row-top treegrid-row-bottom');
opts.onDragLeave.call(target, getRow(this), getRow(source));
},
onDrop:function(e,source){
var dest = this;
var action, point;
var tr = opts.finder.getTr(target, $(this).attr('node-id'));
if (tr.hasClass('treegrid-row-append')){
action = append;
point = 'append';
} else {
action = insert;
point = tr.hasClass('treegrid-row-top') ? 'top' : 'bottom';
}

var dRow = getRow(this);
var sRow = getRow(source);
if (opts.onBeforeDrop.call(target, dRow, sRow, point) == false){
tr.removeClass('treegrid-row-append treegrid-row-top treegrid-row-bottom');
return;
}
action(sRow, dRow, point);
tr.removeClass('treegrid-row-append treegrid-row-top treegrid-row-bottom');
}
});

function allowDrop(source, allowed){
var icon = $(source).draggable('proxy').find('span.tree-dnd-icon');
icon.removeClass('tree-dnd-yes tree-dnd-no').addClass(allowed ? 'tree-dnd-yes' : 'tree-dnd-no');
}
function getRow(tr){
var nodeId = $(tr).attr('node-id');
return t.treegrid('find', nodeId);
}
function append(sRow, dRow){
doAppend();
if (dRow.state == 'closed'){
t.treegrid('expand', dRow[opts.idField]);
}

function doAppend(){
var data = t.treegrid('pop', sRow[opts.idField]);
t.treegrid('append', {
parent: dRow[opts.idField],
data: [data]
});
opts.onDrop.call(target, dRow, data, 'append');
}
}
function insert(sRow, dRow, point){
var param = {};
if (point == 'top'){
param.before = dRow[opts.idField];
} else {
param.after = dRow[opts.idField];
}

var data = t.treegrid('pop', sRow[opts.idField]);
param.data = data;
t.treegrid('insert', param);
opts.onDrop.call(target, dRow, data, point);
}
});
}
});
})(jQuery);