On Wednesday 04 May 2016 00:37:16 Krzysztof wrote:
> Hi Martin,
>
> I'm lost with grids selections. How to make it work as simple
> TListView with "report" mode and "rowselect"? First of all, by default
> I don't see selection. So I checked this options:
>
> gridAlbum.datacols.options := gridAlbum.datacols.options+
> [co_fill,co_focusselect,co_mouseselect,co_rowselect];
>
We need to differ between focused cell and selected cells. By default focusing
of a cell for example by clicking in it does not selecting it. co_rowselect
selects the whole row if a cell has been selected by co_focusselect or
co_mouseselect.
> Now I see what I selected. Going forward, real example from my app. I
> have two grids. By default no one is selected (I mean row). Selecting
> row in first grid, select first row in second grid (only if nothing
> selected in second grid). Same rule for second grid, selecting
> something select first row in first grid if nothing selected. Both
> grids have only one column. Runtime issues:
>
> 1. If nothing selected, grid.row() return value below 0 (for example
> -1073741823). Can I count on it? Should it be -1?
The coordinate system in MSEgui grids has its origin in the first datarow of
the first datacolumn. Fixed rows and columns have negative indices:
-2 -1 0 1 2 column-index
-2 F F F F F
-1 F F F F F
0 F F D D D
1 F F D D D
2 F F D D D
|
+ row index
The big negative numbers mean "none" or "whole column/row", it is the number
constant "invalidaxis" = "-bigint" = -"maxint div 2".
> 2. Tried with grid.getselectedrange.rowcount . If nothing selected
> then it return 0 which is correct. So if it is 0 then I'm selecting
> first row in second grid:
>
> procedure TLibraryWidget.ArtistSelected(const sender: tobject);
> begin
> writeln('artist selected|',gridAlbum.getselectedrange.rowcount);
> if gridAlbum.getselectedrange.rowcount=0 then
> gridAlbum.selectcell(makegridcoord(0,0),csm_select);
> end;
>
> Problem is that, selectcell() indeed select row (I see it visually)
> but at runtime getselectedrange.rowcount is still 0 after selectcell()
> call so condition above is always TRUE. How to handle selections in
> grids properly?
>
Please use DataCols.HasSelection().
GetSelectedRange() returns information about the selection by user interaction
with StartAnchor/EndAnchor which selects a rectangular area.
Martin
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