gtktreeview: Why does gtktreeview retrieve all columns although 99% are not visible? (psppire)

[Friedrich Beckmann]

Hi,

i currently work on psppire http://savannah.gnu.org/projects/pspp/ and want to 
use gtktreeview for a large number of columns (2000) and rows (1). I use 
only a kind of fake tree model while the actual rendering and data retrieval is 
done via gtk_tree_view_column_set_cell_data_func. I noticed that during redraw 
all columns are actually retrieved but only for the visible rows. Here is a log 
showing the access pattern:

(here columns 0 to 1995)
render_data_cell: row: 6, column: 1996
render_data_cell: row: 6, column: 1997
render_data_cell: row: 6, column: 1998
render_data_cell: row: 6, column: 1999
render_data_cell: row: 6, column: 0
render_data_cell: row: 6, column: 1
render_data_cell: row: 6, column: 2
render_data_cell: row: 6, column: 3
render_data_cell: row: 6, column: 4
render_data_cell: row: 6, column: 5
render_data_cell: row: 6, column: 6
render_data_cell: row: 6, column: 7
render_data_cell: row: 6, column: 8
render_data_cell: row: 6, column: 9
render_data_cell: row: 6, column: 10
render_data_cell: row: 6, column: 11
render_data_cell: row: 6, column: 12
render_data_cell: row: 6, column: 13
render_data_cell: row: 6, column: 14
render_data_cell: row: 6, column: 15

Only columns 0 to 15 are visible in the window. Is there any specific reason 
why 2000 columns are retrieved when only 16 are visible? I configured the 
columns as GTK_TREE_VIEW_COLUMN_FIXED. The treeview has the fixed-height mode 
activated. I use gtk3 18.5 on macports. Is there a configuration of the columns 
or the treeview that would prevent this?

The code is here: 
http://git.savannah.gnu.org/cgit/pspp.git/tree/src/ui/gui/psppire-data-sheet.c?h=treeview#n244

Friedrich






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Re: gtk-app-devel-list Digest, Vol 140, Issue 4

[Friedrich Beckmann]

Am 11.12.2015 um 22:45 schrieb Joël Krähemann :
> Doesn't the property work for you?
> 
> g_object_set(var_sheet, "activate-on-single-click", TRUE, NULL);
> 

Hi Joel,

thanks for the hint. activate-on-single-click only influences the activation of 
a cell. I can see the difference on cells which are activatable. I have some 
cells where a dialog opens, when they are activated. I can not see a difference 
on cells which are just editable, i.e. where a text entry widget is used by the 
cell renderer.

Friedrich
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Re: gtk-app-devel-list Digest, Vol 140, Issue 4

[Friedrich Beckmann]

Hi Joel,

thanks for the answer. I guess this is not a race condition. What I want to 
achieve
is to edit cells as in a spreadsheet. That means

A single click starts the editing mode

With gtktreeview I need a first click to select the cell and a second click to 
start editing. Do you
maybe imagine a way how the editing could be started with a single click? The 
code is here:

http://git.savannah.gnu.org/cgit/pspp.git/tree/src/ui/gui/psppire-var-sheet.c?h=treeview

Friedrich


Am 11.12.2015 um 18:26 schrieb Joël Krähemann :

> Hi Friedrich, try to stay on objectives. Do you use an IPC mechanism,
> or is it a separate thread?
> A callback is called by g_main_context_iteration() of gtk_main() it's
> polled some how.
> More code would be great and better information about it.
> 
> If it's a multi-threaded issue you might want to take a look at GMutex
> and GCond.
> With g_mutex_lock() and g_mutex_unlock() you're normally well served.
> 
> Bests,
> Joël Krähemann
> 
>> 





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How can I retrieve gtk style context information from textview widget class without a textview widget?

[Friedrich Beckmann]

Hi,

I would like to use the style information from the textview widget in another 
context. I want
to retrieve the text foreground color and the background color as it would be 
used in a textview widget
and use this style information for rendering inside a drawing area. I figured 
out that I can modify the
style by adding a style class with gtk_style_context_add_class (), but the 
textview background 
color seems to be specific to the textview widget.

In the adwaita scheme css:

GtkTextView {
  background-color: #f6f6f6; }
  GtkTextView:backdrop {
background-color: #f6f6f6; }

Is there a way to retrieve this information of the background-color similar to 
the class mechanism?
I would need the same style context as if I was in a textview widget.

Friedrich




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Re: How can I retrieve gtk style context information from textview widget class without a textview widget?

[Friedrich Beckmann]

Thank you for the hint!
 Then, if you don't have an actual GtkTextView to get the style context
 from, you'll need to create it yourself faking the one a true text view
 would have.  You can probably do that relatively easily with
 gtk_style_context_new() and then setting an appropriate widget path with
 gtk_style_context_set_path()




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