B4A Library Grid/Table and ListView Library

stefanobusetto · Jul 7, 2012

right! here it is!

SelectRow ( int n )
selects the row number n
works also in multiselect mode

BulkSetLength ( int n )
gets ready the grid to be loaded with n rows

all the following requires a prior BulkSetLength

BulkSetRow ( int n , String values() )
sets the contents of the row number n row using the data of the values() array
BulkMapSetRow ( int n , Map m )
the same as the previous but the data are loaded from the map
BulkCursorSetRow ( int n , Cursor c )
the same as the previous but the data are loaded from the cursor

BulkCursorAppend ( Cursor c , int RowStart , int RowEnd )
sets the contents of the grid loading from the cursor
starting from the RowStart row of the cursor
to the RowEnd row of the cursor
the RowStart row of the cursor will become the 0 row of the grid
the RowStart +1 row of the cursor will become the 1 row of the grid
and so on ...

giannimaione · Jul 7, 2012

stefanobusetto said:
try

B4X:

tblScheda(2).Initialize2("Importo","Importo",25%x,Bit.Or ( Gravity.RIGHT , Gravity.CENTER_VERTICAL ))

ok! funziona!
grazie

stefanobusetto · Jul 7, 2012

If you set a custom horizontal gravity
you must set also the vertical one.
The standard vertical gravity is GRAVITY. CENTER_VERTICAL so...
I hope i've been clear

stefanobusetto · Jul 8, 2012

@mahares
vertical scroll is not good if you also set the horizontal one
since now i had no ideas on how to improve this
there are two nested scrollviews with no code associated
your idea sounds interesting may you post a simple
example code ?
tia
stefano

stefanobusetto · Jul 12, 2012

Added ScrollUp and ScrollDown methods

Mahares · Jul 13, 2012

@Stefano: The 2 new methods work very well. ScrollDown position at the last record, ScrollUp position at the first record in the list. I do not know if this is possible or not: Highlight the row when it scrolls to first or last to make it more visual. It can enhance the methods, although it is not paramount.
Thank you for always striving to make it better.

Mahares · Jul 13, 2012

Thank you in advance Stefano: I have figured it out:
To go to last row and highlight it:

B4X:

gg.ScrollDown
gg.selectrow(gg.RowCount-1)

To go to first row and highlight it:

B4X:

gg.ScrollUp
gg.selectrow(0)

molder26 · Jul 16, 2012

@mahares: scrollup and scrolldown are really nice!
Will be nice too an EnsureVisible function to any row specific not only top and bottom like listview have in VB6.
Your lib is the best

Regards

robh · Jul 26, 2012

Column Name

Is there a method I can call to rerieve the column name e.g.
gg.GetColumnName(colIndex)?

Many thanks

Mahares · Jul 26, 2012

I did not see a method like the one you describe in the Grid library either, but here is my thought: When you defined the columns, you had to give them names as strings or string array elements. You can use those variables to retrieve any column name. See below sample: Stefano, the library architect may offer a better solution than the one I use as a workaround:

B4X:

Dim cc(2) As xnGridCol
Dim A As String  :A="F_0"
Dim B As String  :B="F_1"

cc(0).Initialize2 ( A , A , 40dip , Gravity.FILL)
gg.AppendCol ( cc(0) )
cc(1).Initialize2 (B , B , 120dip , Gravity.CENTER_VERTICAL )
gg.AppendCol ( cc(1) )

stefanobusetto · Jul 27, 2012

@robh
i've added the required feature in version 1.61

B4X:

gg.GetColumn(colIndex)?

@mahares
thanks for your help pal

stefanobusetto · Jul 27, 2012

at last i was able to add the grid lines support
far (very far!) to be a final release now works decently on ics and gingerbread
there are otherwise major issues on honeycomb (mainly redraw problems)

to have the gird lines set

B4X:

GridWidth = 1dip

or whatever you like

on some devices grid lines are drawn wrong (see attached example images)
if you get a wrong drawing yust set

B4X:

GridWidthTextOffset = ...
GridWidthCheckOffset = ...

in the sample code i've posted the values working for ics and honeycomb

obviously i'm trying to compute the adjustments automatically
so if you are going to post the values working for your device
may be i'll be able to figure out sooner the solution (tia

)

Mahares · Jul 27, 2012

@Stefano: The GRID lines method look superb. They are classy. I will be your Guinea pig. I tested on the following devices:
Phone OS 4.04: 560x940, Scale=1.5, 240 dpi
7" tablet OS 4.03: 480x800, Scale=1
7" tablet OS 2.2: 480x800, Scale=1
All 3 tests look great. I have 3 foods for thought for next version if possible:
1. Ability to change the color of the GridWidth lines.
2. Ability to turn on and off horizontal and/or vertical lines.
3. Ability to center, or left or right postion the text inside the cells (between grid lines) so the grid lines do not touch the text.

stefanobusetto · Jul 27, 2012

thanks a lot
i did some tests on all the devices i'has able to put my hands on
but not more the 6 or 7 models so your experience is highly valuable

did you change GridWidthTextOffset or GridWidthCheckOffset ?
or the values i've posted where fine?

as for the requests
the first is already done. i forgot to put the reference in the post! :BangHead:

B4X:

gg.GridColor = ...

the others are already under construction
i've done some preliminary test for the third.

Mahares · Jul 27, 2012

did you change GridWidthTextOffset or GridWidthCheckOffset ?
or the values i've posted where fine?

I did not have to change any offsets or even mess with them on the devices I tested. The grids look fine without them.

I also just checked the GridColor method. It works great.

robh · Jul 30, 2012

stefanobusetto said:
@robh
i've added the required feature in version 1.61

B4X:

gg.GetColumn(colIndex)?

@mahares
thanks for your help pal

Nice one, keep up the great work!

robh · Aug 1, 2012

Row Add/Remove

I have an existing grid which has been initialized and displays on screen perfectly with a number of rows.

Later in code I want to remove the existing rows and add some new rows to the grid.

I have tried dg.deleterows which removes the rows as expected leaving just the existing grid and it's header in place however, the problem being that when I attempt to add new rows, the rows get added to the underlying grid object OK but the rows are never display on screen?

So to sum up.

1)Create Grid with x cols, x rows
2) remove existing rows
3) add some rows

Rows in step 3 are never drawn on screen?

Edit: I Forgot to mention, if I comment out the dg.deleterows, then the additional rows I am appending to the grid in step 3 are displayed in the grid?

stefanobusetto · Aug 1, 2012

may you post source code
please

robh · Aug 1, 2012

stefanobusetto said:
may you post source code
please

Hi Steffano

As a test I have done the following:

dg.AppendRow ( Array As String (dataLine.sku,dataLine.descr,dataLine.total,dataLine.month0,dataLine.month1,dataLine.month2,dataLine.month3, _
dataLine.month4,dataLine.month5,dataLine.month6,dataLine.month7,dataLine.month8,dataLine.month9, _
dataLine.month10,dataLine.month11,dataLine.total))

' test clear down of existing row - this works, rows are cleared off screen
dg.DeleteRows

' now add a new row - row is added to rows collection but not displayed on screen

dg.AppendRow ( Array As String (dataLine.sku,dataLine.descr,dataLine.total,dataLine.month0,dataLine.month1,dataLine.month2,dataLine.month3, _
' dataLine.month4,dataLine.month5,dataLine.month6,dataLine.month7,dataLine.month8,dataLine.month9, _
' dataLine.month10,dataLine.month11,dataLine.total))

If I comment out the dg.deleterows line, I get 2 rows displayed in my grid.

hope that helps.

Thank you.

stefanobusetto · Aug 1, 2012

it is a bug!!!
since you delete all rows then insert new ones
you can call GridCreate(...) to repaint
i'll fix the bug as soon as possible
thanks for the bug report

a tip
if you go advanced
you can use the "#" button
to have the b4a code formatted

B4A Library Grid/Table and ListView Library

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