I tried to add an object to a TableView in JavaFX. Then I saw that there is "setAll" and "addAll". So my question is what the difference between these two functions is.
That's quite simple. "setAll" removes all previous elements before the new ones are added and "addAll" does just that. It adds all the elements to the already existing ones.
Related
Update: I updated my code to loop through the list of meshviews and add each to the group using group.getChildren.add(meshview[i]) but still does not show up on screen. Thanks.
I am trying to add an array list of MeshView type to a scene in JavaFx based GUI. I was able to get an initial example to work where it was one MeshView, but now I have a case where the data that is read in from a file results in an array of MeshView type. I could not find a "add" or "addAll" type function on the Group type to let me loop through all of the elements and add them and I could not get the Group constructor to let me add the list at ones in the arguments. I am using a Group to contain them because the over all GUI makes use of a BorderLayout defined using an FXML file. So my initial version adds the meshview to a group along with some point lights and then that group is added to the center of the border layout using the set method of it. Any help would be appreciated. Thanks.
Ps. I think I may have just found an answer. I forgot the add method is under the get children:
group.getChildren().addAll(meshView, pointLight);
as the line above from another answer shows. But I would still be interested in hearing the best ways because I still am confused on how to deal with sitaution where you have say 20 meshviews that make up a part to be shown on screen and you want to combine those and appropriate lights etc and scale to fit in center or borderlayout. I'm guessin I can first all all meshviews using add and then add the lights but was not sure. Thanks again.
You can always add mesh views to any Node type object like Group or BorderLayout ex.
root.getChildren().add(meshView);
you can add as most as you can to this root object and translate the meshView in the scene
meshView.setTranslateX(200);
meshView.setTranslateY(200);
meshView.setTranslateZ(200);
and set the camera and lightpoints configuration and add them as well to the scene
I think this is an easy one, but I can't solve it by myself.
I'm using a TableView from QML, and from Qt with a timer I'm sending info to the TableView to generate new rows.
I want the TableView autoscroll itself and always showme the last row I add
Use
ListView.positionViewAtEnd();
to scroll to the end of list or use
ListView.positionViewAtIndex(int index, PositionMode mode)
to scroll to specified index.
Pay attention, you must call this functions only after the list was loaded (generally in Component.onCompleted)
I find an answer
TableView.positionViewAtRow( TableView.rowCount -1, ListView.End)
I used folibis/Benjamin answer but I have to do it with a TableView, I found this answer to my problem, hope it helps some one else
I have a flat data array that comes form a remoteobject, I want to group whatever is to be grouped, but leave single items (the ones with no common data with anything else) alone and without grouping, it's annoying to open each node only to find there's just one item inside, so there was no need to put it inside that group anyway.
Is this something anyone has done? I can't find any reference and I don't know if getting the hierarchicaldata out of the groupingcollection and then iterate thru it would be any good, sounds like a lot of duplicate work.
I ended up doing what shaunhusain said, I created my own copy of groupingcollection and monkeypatched the way it creates the groups, not clean enough for posting or general use yet, but working on it.
can also be accomplished by using a groupitemrenderer and hiding the disclosure icon based
on the number of children.
<mx:AdvancedDataGrid id="adg"
groupItemRenderer="my.namespace.GroupedItemRenderer"
</mx:AdvancedDataGrid>
GroupedItemRenderer is a subclass of AdvancedDataGridGroupItemRenderer
In updateDisplayList :
if (data && data.hasOwnProperty("children")) {
disclosureIcon.visible = (data.children.length > 0);
}
I'm having some issues when calling getItemIndex on an ArrayCollection with a filterFunction set.
I do something like myAC.removeItemAt(myAC.getItemIndex(myObject)), which works fine when the filtering hasn't been applied. As soon as filtering is applied, getItemIndex seems to return -1 in every case.
Has anyone come across this before? What the best way to remove an item form a filtered ArrayCollection?
Thanks a lot.
Evan
What exactly is your filter filtering out? If you've filtered out everything, getItemIndex should return -1.
Are you hoping to remove items that are still visible when your filter has been applied? If you still want to remove an item that's filtered out, you could temporarily disable the filter:
var filter:Function = ac.filterFunction;
ac.fiterFunction = null;
ac.refresh();
// remove item
ac.filterFunction = filter;
ac.refresh();
I think you'll find there is a source object within the ArrayCollection. What you are seeing is a view of the underlying data with a sort or filter applied. You really want to delete from the underlying source object.
Any time I've dealt with adding and removing items from ArrayCollections in Flex, I've always kept a copy of the original ArrayCollection. Any adding or removing of items happen to that original copy.
Once the changes have been made to the original, I move those forward to the filtered list.
Remove it from source directly
arrayCollection.source.splice(i, 1)
Yeah, so I did find out that I was changing the property of the object - to one that would have it filtered out - prior to trying to remove it. Of course I would get -1 in that case. My mistake.
Ended up going with your suggestion, Stiggler. Seems to work fine, though it seems like there should be a less hackish way to handle this type of thing. Perhaps a parameter you could pass to removeItemAt that would let you access the unfiltered collection.
Anyway, thanks to both of you for your responses. Much appreciated.
what's the best way to remove a row (QTreeWidgetItem) from a QTreeWidget?
The QTreeWidget content has been set by:
myQTreeWidget->insertTopLevelItems(0, items); // items = QList<QTreeWidgetItem*>
then I remove an item from my QList "items" and I try to clear/reset the QTreeWidget
packList->clear();
packList->insertTopLevelItems(0, items);
but my app crashes here!
Suggestions?
Your problem is that calling packList->clear() deletes the tree widget items contained by the tree. (See the documentation about QTreeWidget::clear(), which includes a note about the items being removed from the tree before deleting.) You'll either need to find a way to remove the items, or not maintain a list of them separately from the tree.
On a slightly-related note, if you are trying to keep track of other data along with the tree, I'd recommend you try to use the models paradigm. In non-trivial cases, it has usually been worth my while to convert to that technique, rather than using the widgets/items.
From what this documentation says, you should be able to do it with:
packList->takeTopLevelItem(index);
Which returns removes and returns the item at the supplied index.