Missatge de David Gasa i Castell <dgasac...@gmail.com> del dia dv., 16
d’abr. 2021 a les 19:54:
>
>
> Missatge de David Gasa i Castell <dgasac...@gmail.com> del dia dv., 16
> d’abr. 2021 a les 17:54:
>
>> I'm recently migrated to Gtk+-4 & Gtkmm-4.0, dued mainly to the
>> height-for-width trouble mentioned one week ago.
>>
>> The problem is that I don't see the way to verify that height-for-width
>> feature is back again in a treeview cell rows.
>>
>> If so, I need help to find out the changes that should be implemented in
>> the code attached below to see how the text fits above, in the same cell,
>> when the column size is been reduced.
>>
>> ---- code -----
>>
>> #include <gtkmm.h>
>> #include <map>
>>
>> class MyWindow
>> :
>> public Gtk::Window
>> {
>> public:
>>
>> MyWindow();
>> virtual ~MyWindow();
>>
>> private:
>>
>> void fill_treeview();
>>
>> void wrap_col (Gtk::TreeViewColumn *, Gtk::CellRendererText *);
>>
>> std::map<gint, Glib::ustring> messages;
>>
>> // Gtkmm widgets
>>
>> Gtk::Box box;
>>
>> Gtk::TreeView treeview;
>>
>> Gtk::Separator separator;
>> Gtk::Button button;
>>
>> class ModelColumns
>> :
>> public Gtk::TreeModel::ColumnRecord
>> {
>> public:
>>
>> ModelColumns()
>> {
>> add (id);
>> add (message);
>> }
>>
>> Gtk::TreeModelColumn<gint> id;
>> Gtk::TreeModelColumn<Glib::ustring> message;
>> }
>> model_cols;
>>
>> Glib::RefPtr<Gtk::ListStore> refListStore;
>>
>> Gtk::TreeRow row;
>> };
>>
>> MyWindow::MyWindow()
>> :
>> box (Gtk::Orientation::VERTICAL, 5),
>> button ("Close"),
>>
>> messages ({
>> {1, "Message: one"},
>> {2, "Message: one two"},
>> {3, "Message: one two three"},
>> {4, "Message: one two three four"}
>> }),
>>
>> refListStore (Gtk::ListStore::create (model_cols))
>> {
>> set_title ("MyWindow");
>>
>> treeview.set_model (refListStore);
>>
>> treeview.append_column ("Id.", model_cols.id);
>>
>> gint m_col =
>> treeview.append_column ("Message", model_cols.message)-1;
>>
>> if (Gtk::TreeViewColumn * cl_message = treeview.get_column (m_col))
>> {
>> cl_message->connect_property_changed ("width",
>> sigc::bind (sigc::mem_fun (*this, &MyWindow::wrap_col), cl_message,
>> dynamic_cast<Gtk::CellRendererText *>(treeview.get_column_cell_renderer
>> (m_col))));
>> }
>>
>> treeview.set_vexpand();
>> treeview.set_margin (10);
>>
>> button.set_margin (10);
>>
>> box.append (treeview);
>> box.append (separator);
>> box.append (button);
>>
>> button.signal_clicked().connect (sigc::mem_fun (*this,
>> &Gtk::Widget::hide));
>>
>> set_child (box);
>>
>> fill_treeview();
>> }
>>
>> void
>> MyWindow::fill_treeview()
>> {
>> if (!refListStore->children().empty())
>> refListStore->clear();
>>
>> for (auto & it : messages)
>> {
>> row = *(refListStore->append());
>>
>> row[model_cols.id] = it.first;
>> row[model_cols.message] = it.second;
>> }
>> }
>>
>> void
>> MyWindow::wrap_col (
>> Gtk::TreeViewColumn * _column, Gtk::CellRendererText * _cell_renderer)
>> {
>> _cell_renderer->property_wrap_mode() = Pango::WrapMode::WORD;
>>
>> gint width = _column->get_width();
>> _cell_renderer->property_wrap_width() = width;
>> }
>>
>> MyWindow::~MyWindow()
>> {
>> }
>>
>> int main (int argc, char* argv[])
>> {
>> auto app = Gtk::Application::create ("org.gtkmm");
>> return app->make_window_and_run<MyWindow>(argc, argv);
>> }
>>
>> --
>> David Gasa i Castell
>>
>> Linux User #488832
>>
>
> By these changes seems to be possible to reduce the column size and the
> text breaks fine (word wrapping)...
>
> if (Gtk::TreeViewColumn * cl_message = treeview.get_column (m_col))
> {
> cl_message->set_fixed_width (0);
> cl_message->set_min_width (0);
>
> cl_message->connect_property_changed ("width",
> sigc::bind (sigc::mem_fun (*this, &MyWindow::wrap_col), cl_message,
> dynamic_cast<Gtk::CellRendererText *>(treeview.get_column_cell_renderer
> (m_col))));
> }
>
> But the rest of text line is hidden, getting something like,
>
> =================
> Id Messages
> =================
> 1 Message: one
> =================
> 2 Message: one
> =================
> 3 Message: one
> =================
> 4 Message: one
> =================
>
> How could I do to get as follows ?
>
> =================
> Id Messages
> =================
> 1 Message: one
> =================
> 2 Message: one
> two
> =================
> 3 Message: one
> two three
> =================
> 4 Message: one
> two three four
> =================
>
I found that I was probably wrong implementing the callback to wrap_col.
This solution fits the text better,
if (Gtk::TreeViewColumn * cl_message = treeview.get_column (m_col))
{
Gtk::CellRendererText * c_message =
dynamic_cast<Gtk::CellRendererText *>(treeview.get_column_cell_renderer
(m_col));
c_message->property_wrap_mode() = Pango::WrapMode::WORD;
c_message->property_wrap_width() = cl_message->get_width();
}
The question now is to find how to clean the extra space before and after
text in cells.
--
David Gasa i Castell
Linux User #488832
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