Today MartinWittemann wrote:
>
> Hi tobi,
> I don't know exactly your use case but if you can use the grid instead, do
> so.
> No matter what way you will go, i'm sure everyone is interested in the
> outcome. ;)
it will be public ... soon ...
in any event, I have been playing with a custom cellrenderer and
found an interesting thing ...
_getContentHtml gets called realy often, way more than the the
number of rows in the table. I bet this is not optimal for
performance (not only for my canvas use case ) ...
if I resize a single column, then the method gets called once per
row, but when I resize the whole table (causing all the columns to
resize) then _getContentHtml for a single cell gets called once per
column of the table ...
cheers
tobi
> Martin
>
>
>
> oetiker wrote:
> >
> > Hi Martin,
> >
> > I was meditating on this problem tonight, and I see two scenarios:
> >
> > a) create a cellrenderer.Canvas which adds a canvas tag with a
> > running id into the table and adds the values with the id into a
> > queue.
> >
> > _getContentHtml : function(cellInfo) {
> > var id = this.__id+cellInfo.row+'x'+cellInfo.col;
> > this.__queue.push([id,cellInfo.value]);
> > return "<canvas id='"+id+"'></canvas>";
> > },
> >
> > using the paneReloadsData I would then call the new 'update'
> > method on the cellrenderer object, causing it to render all the
> > canvas elements in the __queue, much like you suggested below.
> >
> > on the other hand,
> >
> > b) my use case is such that I am updateing the table every few
> > seconds with new data coming from the server. Since I am
> > replacing the entire table content on every update I wonder if
> > this is the most efficient thing todo, especially since the table
> > is only 10 - 100 lines long. I can see the browser using an
> > increassing amount of memory as the table is being updated ...
> >
> > if the table aproach does not work I will try the grid layout
> > instead. This would would also solve the canvas issue since the
> > grid can contain normal widgets ...
> >
> > cheers
> > tobi
> >
> > Yesterday MartinWittemann wrote:
> >
> >>
> >> Hello Tobi,
> >>
> >> I just tried reproduce your problem but I guess there is no event exactly
> >> dedicated to such a scenario. I tried the paneReloadsData of the table
> >> pane
> >> and it worked more or less. Take a look at the modified table playground
> >> example to see how you could do it.
> >>
> >> function createRandomRows(rowCount) {
> >> var rowData = [];
> >> var nextId = 0;
> >> for (var row = 0; row < rowCount; row++) {
> >> rowData.push([ nextId++, " abc " ]);
> >> }
> >> return rowData;
> >> }
> >>
> >> // window
> >> var win = new qx.ui.window.Window("Table").set({
> >> layout : new qx.ui.layout.Grow(),
> >> contentPadding: 0
> >> });
> >> this.getRoot().add(win);
> >> win.open();
> >>
> >> // table model
> >> var tableModel = new qx.ui.table.model.Simple();
> >> tableModel.setColumns([ "ID", "HTML" ]);
> >> tableModel.setData(createRandomRows(10));
> >>
> >> // table
> >> var table = new qx.ui.table.Table(tableModel).set({
> >> decorator: null
> >> })
> >> win.add(table);
> >>
> >> // table column model
> >> var tcm = table.getTableColumnModel();
> >> tcm.setDataCellRenderer(1, new qx.ui.table.cellrenderer.Html());
> >>
> >> var scroller = table.getPaneScroller(0);
> >> var pane = scroller.getTablePane();
> >> pane.addListener("paneReloadsData", function() {
> >> console.log(document.getElementById("xx1"));
> >> }, this);
> >>
> >> Anyway, I will talk to Fabian, who is our Table maintainer. Perhaps he
> >> has a
> >> more elegant solution to this.
> >> Best,
> >> Martin
> >>
> >>
> >> oetiker wrote:
> >> >
> >> > Folks,
> >> >
> >> > I would like to place a canvas element into a table cell. Putting
> >> > the <canvas></canvas> html there is simple, but since I need access
> >> > to the DOM element to paint on the canvas and in the cellrenderer
> >> > I am only dealing with a html string I am a bit lost as to the best
> >> > aproach for this ...
> >> >
> >> > is there some event which I could listen for as to when the cells
> >> > html is put into the DOM ?
> >> >
> >> > cheers
> >> > tobi
> >> >
> >> >
> >> > --
> >> > Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
> >> > http://it.oetiker.ch [email protected] ++41 62 775 9902 / sb: -9900
> >> >
> >> >
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> >> >
> >> >
> >>
> >>
> >
> > --
> > Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
> > http://it.oetiker.ch [email protected] ++41 62 775 9902 / sb: -9900
> >
> > ------------------------------------------------------------------------------
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> > 30-Day
> > trial. Simplify your report design, integration and deployment - and focus
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>
>
--
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch [email protected] ++41 62 775 9902 / sb: -9900
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