I have found the solution for the dragging part.
While
gtk_tree_view_enable_model_drag_source (GTK_TREE_VIEW (treeview), 1,
enable_list, GDK_ACTION_MOVE); // enable_list is a GtkTargetEntry structure
was working in GTK3 (in fact this was a leftover from the GTK2 beginnings
of the program), it has to be now
gtk_tree_view_enable_model_drag_source (GTK_TREE_VIEW (treeview),
GDK_BUTTON1_MASK, content_formats, GDK_ACTION_MOVE); // content_formats is
a GdkContentFormats structure
So the real difference was using GDK_BUTTON1_MASK in GTK4.
The actual process of moving the tree rows inside the tree view is not yet
working in the GTK4 version, but if I can't make it work I can come back
here later.
2018-03-12 21:30 GMT+01:00 <lrn1...@gmail.com>:
> On 12.03.2018 19:45, Marcus Schätzle wrote:
>
>> Hi all,
>>
>> I've done a port of a program to GTK4 (3.93.3); there is a part that I
>> have not yet gotten to work and that is drag and drop inside a tree view.
>>
>> I have particularly trouble understanding using the target formats
>> inside gtk_tree_view_enable_model_drag_dest (). For the GTK 3 version I
>> use a GtkTargetEntry structure initialised with {{ "STRING",
>> GTK_TARGET_SAME_WIDGET, 0 }}, which has always worked fine so far.
>>
>
> That is surprising. Usually i'd go for "UTF8_STRING".
>
> For GTK 4 I am supposed to use GdkContentFormats. But which mime types am
>> I supposed to fill into gtk_content_formats_new ()?
>>
>
> "text/plain;charset=utf-8" is the GTK4 equivalent of "UTF8_STRING"
>
> That's all i know.
>
> Note that last time i checked there was a bug that prevented DnD from
> working correctly in some cases. For example, DnD of text didn't work for
> GtkTextView, but did work for GtkEntry.
>
>
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>
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