Is it Gtk2 or Gtk3, which version exactly?
Il giorno mar 18 dic 2018 alle ore 18:47 Mitko Haralanov via gtk-list <
gtk-list@gnome.org> ha scritto:
> I mistakenly replied only to Luca!! Forwarding to the list.
>
> (Sorry, Luca, my bad)
> - Mitko
>
> ---------- Forwarded message ---------
> From: Mitko Haralanov <voidtra...@gmail.com>
> Date: Tue, Dec 18, 2018 at 9:37 AM
> Subject: Re: Emitting signals from threads
> To: Luca Bacci <luca.bacci...@gmail.com>
>
>
> I found something that is different between the two cases - button click
> with signals and without.
>
> Using the code from the link that Luca posted, I decided to print the size
> of each column when a button press is received. As it turns out, the width
> of the columns is different in the two cases:
>
> Without thread signals:
> column[0](193) = 0 -> 193
> cell[0] = min->109, natural->109
> column[1](66) = 193 -> 259
> cell[0] = min->20, natural->20
> cell[1] = min->16, natural->16
> cell[2] = min->35, natural->35
> column[2](36) = 259 -> 295
> cell[0] = min->16, natural->16
> x = 105.872116, y = 259.547516
>
> (x and y are the coordinates of the button press event)
>
> With thread signals:
> column[0](0) = 0 -> 0
> cell[0] = min->135, natural->135
> column[1](66) = 0 -> 66
> cell[0] = min->20, natural->20
> cell[1] = min->16, natural->16
> cell[2] = min->35, natural->35
> column[2](36) = 66 -> 102
> cell[0] = min->16, natural->16
> x = 113.528488, y = 158.563782
>
> As you can see, the width of the first column is 0 when the signals are
> being emitted. As expected, if I were to click very close to the left
> border of the widget, the edit dialog does not get triggered as the x
> coordinate falls within column 1:
>
> column[0](0) = 0 -> 0
> cell[0] = min->135, natural->135
> column[1](66) = 0 -> 66
> cell[0] = min->20, natural->20
> cell[1] = min->16, natural->16
> cell[2] = min->35, natural->35
> column[2](36) = 66 -> 102
> cell[0] = min->16, natural->16
> x = 21.247330, y = 181.310333
>
> I could use the cell renderer width if the column width is 0 but that
> seems unreliable since the cell renderer width is not the same as the
> column and it's also not static.
>
> On Tue, Dec 18, 2018 at 8:23 AM Mitko Haralanov <voidtra...@gmail.com>
> wrote:
>
>> I am not posting the complete function because there is a lot of
>> irrelevant code. I am also not interested in the specific cell renderer but
>> rather the row on which the click occurred.
>>
>> tatic gboolean on_button_press_event(GtkWidget *widget,
>> GdkEvent *event,
>> gpointer data)
>> {
>> GtkTreeView *treeview = GTK_TREE_VIEW(widget);
>> GdkEventButton *button = (GdkEventButton *)event;
>> GtkTreeModel *model;
>> GtkTreePath *path;
>> GtkTreeIter iter;
>> GtkTreeViewColumn *column;
>> GtkScopeProjectEditDialog *dialog;
>> GtkScopeProjectEditData *pdata, fill;
>> GtkScopeProject *project;
>> guint response, index;
>> gboolean ret = FALSE;
>>
>> if (button->type != GDK_BUTTON_PRESS ||
>> !gtk_tree_view_get_path_at_pos(treeview, button->x, button->y,
>> &path, &column, NULL, NULL))
>> return FALSE;
>>
>> index = GPOINTER_TO_UINT(g_object_get_data(G_OBJECT(column), "index"));
>> if (index != TREEVIEW_COLUMN_EDIT)
>> goto done;
>> model = gtk_tree_view_get_model(treeview);
>> if (!gtk_tree_model_get_iter(model, &iter, path))
>> goto done;
>> gtk_tree_model_get(model, &iter, PROJECT_COLUMN_OBJ, &project, -1);
>> ...
>>
>> The issue is that the column which is returned by
>> gtk_tree_view_get_path_at_pos() is different depending on whether thread
>> signals are being emitted vs not. I have verified that the button press
>> coordinates are the same (button->x and button->y have the same values in
>> both cases).
>>
>>
>> On Tue, Dec 18, 2018 at 5:24 AM Luca Bacci <luca.bacci...@gmail.com>
>> wrote:
>>
>>> Hi Mitko! Can you post here the code for the button-press event handler?
>>> It should more or less follow the code here:
>>> http://scentric.net/tutorial/sec-misc-get-renderer-from-click.html
>>>
>>> Luca
>>>
>>> Il giorno lun 17 dic 2018 alle ore 20:28 Mitko Haralanov via gtk-list <
>>> gtk-list@gnome.org> ha scritto:
>>>
>>>> Hi,
>>>>
>>>> In my application, I want to be able to update a treeview from a
>>>> separate thread. Each treeview row was a column that is a progress bar. The
>>>> progress to be displayed is generated by a separate thread as to not block
>>>> the UI.
>>>>
>>>> Since GTK is not thread-safe, the way the application is written is
>>>> that the thread, when it needs to emit a signal, will prepare the signal
>>>> data and then call g_main_context_invoke_full(NULL, cb, data, ...) in order
>>>> to be able to call g_singal_emit() in the global default context thread.
>>>> The signal handler updates the tree model, which in turn updates the tree
>>>> view.
>>>>
>>>> For the most part this works with one big, ugly exception - the same
>>>> treeview has a column, which is supposed to open the item's Edit dialog
>>>> when clicked. So, naturally, I have a button-press handler connected to the
>>>> treeview, which launches the Edit dialog when the button press occurs in
>>>> the correct column.
>>>>
>>>> However, when an update is running and the thread is continuously
>>>> emitting signals, clicking on *any* column of *any* of the other items
>>>> opens the Edit dialog. The treeview behaves as if the items in it have only
>>>> one column.
>>>>
>>>> Every example or document that I have seen in relation to signals from
>>>> threads says to emit the signal from a g_idle_add() handler. However,
>>>> g_main_context_invoke_full(NULL, ...) should be the same as calling
>>>> g_idle_add().
>>>>
>>>> Can someone shed some light into what might be happening?
>>>>
>>>> Thank you.
>>>>
>>>>
>>>> _______________________________________________
>>>> gtk-list mailing list
>>>> gtk-list@gnome.org
>>>> https://mail.gnome.org/mailman/listinfo/gtk-list
>>>>
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