17 replies to this topic

[MFinkle]

We added the ability to TAB (and SHIFT + TAB) through the columns in the Input Row. It was not very difficult, but required code changes in several PAS units.

Let me know if you want the code to add to TGridView.

Mark Finkle

[Boki (Berg)]

Hello Marc,

Yes please. I have try this several times but I can't catch TAB key for some reason Please send me code and I will include it.

regards

[NoSi]

Hi Marc, Hi Boki,

what is the status of this? Is this ability available with next update (@Boki) or have I to add this by myself (where can I find the changes...)?

If it is part of the next update :twisted: ... when will it be available?

[MFinkle]

I am collecting the code changes. We recently added code to handle auto-scrolling as you TAB across the grid. Also, we added a property to control how the TAB key should be handled:
1. Allow tabbing inside the grid and stop on the last column
2. Allowing tabbing inside the grid and jump to the next control on the form after the last column.

#1 is good when the gridview is the only control on a form (Align = alClient)

#2 is good when the gridview is on a dialog with other controls.


I'll send the changes to Boki soon.

MFinkle

[Boki (Berg)]

Thank you Mark.

regards

[NoSi]

That´s great!

I have to say, that the handling of the grid seems a l little bit "unusual" to me. Maybe I did not find the perfect options settings yet, but as I mentioned in another thread, I´d prefer the handling as given in other apps: F2 for editing, Alt-Down for opening lists, aso. Tabbing thru the grid will be a major improvement and a great step to the behaviour, users usually can handle without explanation.

To have a better control on the input (header), I miss some events - but this is part of investigations, I am still going to do. Maybe some explanations and completion of help file would decrease some of my "beginner challenges".

[jamiguel77]

can share the code for work the TAB key?


thanks

[MFinkle]

We are planning to share the code. Unfortunately, we are working with a forked version of TGridView (TNxGrid). We will have to merge our changes into the current release, which is not trivial and won't happen until November timeframe.

[Boki (Berg)]

Hello,

I have add it into v3.3.1 officialy. There is new property named WantTabs: Boolean for using Tab key.

Best regards

[MFinkle]

Great Boki !

That's one less feature we need to merge when we start using the latest version of NxGrid.

Thanks

[wvd_vegt]

Hi,

Now up for a treecolumn! ;-)

[Raymond]

Yes...

tree column / hierarchical data handling (child/parent/grandparent/etc) is very important to me as well...

Especially if we can have controll over when a node is expanded... that way we can load _only_ the root items and then load a node's children when that node is expanded.

This really speeds things up!!!

-Raymond

[wvd_vegt]

Hi Raymond,

I think the dynamic creation of children is a a nice fature but for most small projects a bit overkill (but i would love to see it).

Btw I made the remark because i started on a treecolumn myself last week to see if the show/hiding of NextGrid could be used to mimic a tree. By simply adding a datastructure with the indent level and visibility count and writing some code to add a child (that is insert a row at the correct place in the table) it seems to work. Drawback off-course is that you should not mix addrow with addchild calls as it will ruin the dadastructure.

I used a normal text column for display of +/- signs, so nothing graphical or mouse awareness yet (but i pm'ed the code to Boki ;-) in order so he can have a look at it).

Your request could perhaps be done if you add the children but do not fill the columns yet. At the moment i use the data stored in the cells of the trecolumn to compute the +/- signs so there should be at least a single child.

[Boki (Berg)]

Hello Wim and Ray,

I have receive sample code from Wim, but I also have start to work something similar. Now it is quite easy to made tree column because there is show/hide feature for rows.

If you have some more suggestions about tree column, please tell me.

Best regards
Boki (Berg)

[Raymond]

Boki and Wim...

This is great news.. and has what has prevented me from using NextGrid in many of my projects up to now!!!!!

I do like the dynamic load of child data to keep the loads fast...

Think about it this way, only the root needs to be loaded.

Upon an expand of a node, then I could use this Event to dynamically add in whatever children (maybe via SQL...) that belong to this parent node.

I am not saying that all nodes could not be loaded right away... but if you have lots of data or need some speed... then the Expand event would allow you to have this flexibility.

What this means is that the HasChildren property of a node could be set to True when the Node is created.

When the node is expanded the "attempt" could be made to load the children of this node.

If no children exist, then the HasChildren property could be set to False.

I hope this makes sense ... I have only started to sip on my espresso and my head is still a bit foggy!

-Raymond

[wvd_vegt]

Hi,

Indeed good news!!! I hope i can exepect a first version real soon (any idea when?) as i want to use it in one of my projects. If you need testers, please let me now!

Perhaps an idea is to make an OnGetChildCount event that is called whenever you need the childcount. If > 0 it means it's not a leafnode. For hidden nodes it doesn't get called until their parent becomes visible.

Together with an OnBeforeExpand event you could than load the next level of nodes. To mirrot things i would like see a OnAfterCollapse too so you can remove data to preserve resources by removing data.

btw I had some nasty scrolling problems with my sample code.

But it's perhaps good to keep the focus on the fact that most trees will be small and be statically loaded with data.