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treegrid
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fix underscroll & overscroll, but scroll is still jumping

master
Vitaliy Filippov 2017-07-05 18:20:27 +03:00
parent bcc9a26ef2
commit 70488eeb8e
1 changed files with 69 additions and 33 deletions
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102
treegrid.js
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@ -176,6 +176,7 @@ function TreeGrid(options)
addListener(this.wrapper||this.table, 'mouseout', function(ev) { self.nodeOnHover(false, ev); });
this.setHeader(options.header);
this.nodeCount = 0;
this.placeholders = {};
new TreeGridNode({ children: options.items }, this, null, 0);
}
@ -369,23 +370,32 @@ TreeGrid.prototype._syncStart = function(nodes)
}
}
TreeGrid.prototype._addPlaceholder = function(elems)
TreeGrid.prototype._setPlaceholder = function(name, height)
{
if (elems <= 0)
return;
var height = elems*this.minItemHeight;
var tr = document.createElement('tr'), col_tr;
tr.is_placeholder = true;
tr.appendChild(document.createElement('td'));
tr.style.height = height+'px';
this.placeholders[name][0].style.height = height+'px';
this.placeholders[name][0].style.display = height > 0 ? '' : 'none';
if (this.fixedColBody)
{
col_tr = document.createElement('tr');
col_tr.is_placeholder = true;
col_tr.appendChild(document.createElement('td'));
col_tr.style.height = height+'px';
this.placeholders[name][1].style.height = height+'px';
this.placeholders[name][1].style.display = height > 0 ? '' : 'none';
}
this._syncStartNode(tr, col_tr);
}
TreeGrid.prototype._addPlaceholder = function(name, height)
{
if (!this.placeholders[name])
{
this.placeholders[name] = [];
for (var i = 0; i < (this.fixedColBody ? 2 : 1); i++)
{
this.placeholders[name][i] = document.createElement('tr');
this.placeholders[name][i].is_placeholder = true;
this.placeholders[name][i].appendChild(document.createElement('td'));
}
}
if (height !== undefined)
this._setPlaceholder(name, height);
this._syncStartNode(this.placeholders[name][0], this.placeholders[name][1]);
}
TreeGrid.prototype._finishSync = function()
@ -423,36 +433,45 @@ TreeGrid.prototype._finishSync = function()
TreeGrid.prototype._findVisibleNodeOffset = function(nodes, offsetHeight)
{
var h = 0, nh = 0, h1, h2;
var h = 0, nh, h1, h2, r = 0, notfound = true;
for (var i = nodes.length-1; i >= 0; i--)
{
nh = 0;
if (this.fixedColBody)
{
for (var j = 0; j < nodes[i].tr.length; j++)
{
h1 = nodes[i].tr[j].offsetHeight||0;
h2 = nodes[i].col_tr[j].offsetHeight||0;
nh += h1 < h2 ? h2 : h1;
}
}
else
for (var j = 0; j < nodes[i].tr.length; j++)
nh += nodes[i].tr[j].offsetHeight||0;
nh = getNodeHeight(nodes[i]);
h += nh;
if (h >= offsetHeight)
if (notfound && h >= offsetHeight)
{
return i + (h-offsetHeight)/nh;
notfound = false;
r = i + (h-offsetHeight)/nh;
}
}
return 0;
this.endItemHeight = h;
return r;
}
function getNodeHeight(node)
{
var nh = 0;
if (node.col_tr)
{
for (var j = 0; j < node.tr.length; j++)
{
h1 = node.tr[j].offsetHeight||0;
h2 = node.col_tr[j].offsetHeight||0;
nh += h1 < h2 ? h2 : h1;
}
}
else
for (var j = 0; j < node.tr.length; j++)
nh += node.tr[j].offsetHeight||0;
return nh;
}
TreeGrid.prototype.syncView = function()
{
if (!this.table.offsetParent)
return;
var scrollPos = this.tableWrapper.scrollTop / (this.tableWrapper.scrollHeight - this.tableWrapper.offsetHeight + 1);
var scrollPos = this.tableWrapper.scrollHeight > this.tableWrapper.offsetHeight ?
this.tableWrapper.scrollTop / (this.tableWrapper.scrollHeight - this.tableWrapper.offsetHeight) : 0;
var offsetHeight = this.wrapper.offsetHeight - this.thead.offsetHeight;
var visibleItems = Math.ceil(offsetHeight/this.minItemHeight);
var endStart = this.nodeCount - visibleItems;
@ -470,10 +489,17 @@ TreeGrid.prototype.syncView = function()
var firstVisible = scrollPos*lastFirst;
var rangeStart = Math.floor(firstVisible);
var rangeCount = visibleItems;
this._addPlaceholder(rangeStart);
this._addPlaceholder('top');
var firstItemHeight;
if (rangeStart >= endStart)
{
// Nothing more to render
firstItemHeight = 0;
for (var i = rangeStart-1; i >= endStart; i--)
{
firstItemHeight += getNodeHeight(lastNodes[i-endStart]);
}
firstItemHeight += getNodeHeight(lastNodes[rangeStart-endStart])*(firstVisible-rangeStart);
}
else
{
@ -486,12 +512,15 @@ TreeGrid.prototype.syncView = function()
this._syncStart(visibleNodes);
if (endStart > rangeStart+rangeCount)
{
this._addPlaceholder(endStart-rangeStart-rangeCount);
this._addPlaceholder('mid', 0);
}
firstItemHeight = getNodeHeight(visibleNodes[0])*(firstVisible-rangeStart);
}
this._setPlaceholder('top', this.tableWrapper.scrollTop-firstItemHeight);
}
this._finishSync();
// Then sync row sizes for fixed column to work properly
var total = 0;
if (this.stickyHeaders)
{
if (this.fixedCol.offsetWidth)
@ -508,12 +537,19 @@ TreeGrid.prototype.syncView = function()
{
if (h[i] && !this.tbody.rows[i].is_placeholder)
{
total += h[i];
this.tbody.rows[i].style.height = h[i]+'px';
this.fixedColBody.rows[i].style.height = h[i]+'px';
}
}
this.syncStickyRow();
}
if (endStart > 0)
{
var avgItemHeight = this.endItemHeight / lastNodes.length;
avgItemHeight = (avgItemHeight < this.minItemHeight ? this.minItemHeight : avgItemHeight);
this._setPlaceholder('mid', this.nodeCount*avgItemHeight - total - (this.tableWrapper.scrollTop-firstItemHeight));
}
}
TreeGrid.prototype.nodeOnHover = function(hover, ev)