On 11/27/2013 12:59 PM, Kjell Ahlstedt wrote:
2013-11-26 22:37, a skrev:
On 11/26/2013 08:33 AM, Kjell Ahlstedt wrote:
2013-11-26 05:09, a skrev:
Hi,
I'm trying to connect to the configure signal
event(signal_configure_event()), in the documentation I read that
you have to enable Gdk::STRUCTURE_MASK, and I think that is the
problem I am having. I tried do it several different ways, like this:
this->add_events(Gdk::STRUCTURE_MASK);
Gtk::Window::add_events(Gdk::STRUCTURE_MASK);
MainWindow::add_events(Gdk::STRUCTURE_MASK); //I think they are all
synonyms, but just in case they weren't
and I tried using set_events() function too. Is this the correct
way to enable STRUCTURE_MASK?
Thank you.
Tim O.
Have you read
https://developer.gnome.org/gtkmm-tutorial/stable/sec-xeventsignals.html.en#signal-handler-sequence
and added an after = false parameter in your call to
signal_configure_event().connect()?
Kjell
Thank you for the link, but I recently just read that using the
configure signal could have performance problems, and I read in an
old mailing list that signal_expose_event should be used, which is
now signal_draw. So instead I was thinking of using
signal_size_allocate. Because all I really want is just the window's
size. So which one of these would have better for getting the
window's size and then increases a Gtk::Entry width. Thank you.
Tim O.
Is this a continuation of your question in
https://mail.gnome.org/archives/gtkmm-list/2013-November/msg00070.html ?
I made a small test with the example program in
https://git.gnome.org/browse/gtkmm-documentation/tree/examples/book/entry/simple?h=master
I changed the vertical box to a horizontal box. The Entry widget
expands with the window if it's added to the box with
pack_start(m_Entry, Gtk::PACK_EXPAND_WIDGET). If you want the Entry to
get all extra space, you should add other widgets to the box with
Gtk::PACK_SHRINK.
If you can't get this to work, can you post a small program here on
the mailing list? A program that does not behave the way you want,
when its window is expanded.
Kjell
Here is how I solved it the problem, probably not the best way, but it
works kind of:
//mainwindow.h
class MainWindow : public Gtk::Window
{
public:
MainWindow();
virtual ~MainWindow();
protected:
bool txtChange(GdkEventKey*, Gtk::Entry&, bool override = false);
void txtDelete(int start_pos, int end_pos, Gtk::Entry&, bool
override = false);
void boxMainChange(Gtk::Allocation&);
Gtk::Box box_main_, box_split_, box_ans_, box_exp_;
Gtk::Label lbl_exp_, lbl_ans_;
Gtk::Entry txt_exp_, txt_ans_;
private:
inline int charToPixals(int chars) const;
int getSize(int diff);
inline int txt_length_to_pix(int txt_length) const;
const int default_txtbox_size_;
static constexpr int kchar_limit_ = 20;
static constexpr int kavg_char_size = 2;
static constexpr int kchars_width_ = 4;
int win_width_;
};
//mainwinoh.cc
MainWindow::MainWindow() :
default_txtbox_size_(txt_exp_.get_allocated_width())
{
Gtk::Window::set_default_size(400, 320);
//box_main
box_main_.set_orientation(Gtk::ORIENTATION_VERTICAL);
//box_split
box_split_.set_orientation(Gtk::ORIENTATION_VERTICAL);
//box_exp
box_exp_.set_orientation(Gtk::ORIENTATION_HORIZONTAL);
box_exp_.set_halign(Gtk::ALIGN_CENTER);
box_exp_.set_margin_top(30);
box_exp_.set_margin_bottom(30);
//box_ans
box_ans_.set_orientation(Gtk::ORIENTATION_HORIZONTAL);
box_ans_.set_halign(Gtk::ALIGN_CENTER);
box_ans_.set_margin_bottom(30);
//lbl_exp
lbl_exp_.set_text("Expression: ");
lbl_exp_.set_margin_right(5);
//lbl_ans
lbl_ans_.set_text("Answer: ");
lbl_ans_.set_margin_right(5);
//Setup MainWindow
Gtk::Window::add(box_main_);
box_main_.pack_start(box_split_);
box_split_.pack_start(box_exp_);
box_split_.pack_start(box_ans_);
box_exp_.pack_start(lbl_exp_);
box_exp_.pack_start(txt_exp_);
box_ans_.pack_start(lbl_ans_);
box_ans_.pack_start(txt_ans_);
//update txtbox size
txt_exp_.signal_key_press_event().connect(sigc::bind<Gtk::Entry&,
bool>(sigc::mem_fun(*this, &MainWindow::txtChange), txt_exp_, true), false);
txt_exp_.signal_delete_text().connect(sigc::bind<Gtk::Entry&,
bool>(sigc::mem_fun(*this, &MainWindow::txtDelete), txt_exp_, true));
//txt_ans_.signal_changed()
txt_ans_.signal_delete_text().connect(sigc::bind<Gtk::Entry&,
bool>(sigc::mem_fun(*this, &MainWindow::txtDelete), txt_ans_, false));
txt_ans_.signal_key_press_event().connect(sigc::bind<Gtk::Entry&,
bool>(sigc::mem_fun(*this, &MainWindow::txtChange), txt_ans_, false),
false);
//increases txt box size when window size is increased
signal_size_allocate().connect(sigc::mem_fun(*this,
&MainWindow::boxMainChange));
MainWindow::show_all_children();
}
MainWindow::~MainWindow()
{
}
inline int MainWindow::charToPixals(int chars) const
{
return kavg_char_size * chars;
}
bool MainWindow::txtChange(GdkEventKey* key, Gtk::Entry& entry, bool
override)
{
if(key->keyval == 65288) //Gdk number for backspace
return false;
int txt_length = entry.get_text_length();
int txtl_p = txt_length_to_pix(txt_length);
if(entry.get_allocated_width() > txtl_p) //txtbox is big enough
already from Mainwindow
return false;
if(txt_length < kchar_limit_)
return false;
if(override)
txt_ans_.set_size_request(entry.get_width() +
charToPixals(kchars_width_), -1);
entry.set_size_request(entry.get_width() +
charToPixals(kchars_width_), -1);
return false;
}
void MainWindow::txtDelete(int start_pos, int end_pos, Gtk::Entry&
entry, bool override)
{
int txt_length = entry.get_text_length();
if(txt_length < kchar_limit_)
return;
if(override)
txt_ans_.set_size_request(entry.get_width() -
charToPixals(kchars_width_), -1);
entry.set_size_request(entry.get_width() -
charToPixals(kchars_width_), -1);
if(txt_length < kchar_limit_)
entry.set_size_request(default_txtbox_size_, -1);
}
int MainWindow::getSize(int diff)
{
if(diff == 1)
return 1;
else if(diff < 6)
return 2;
else if(diff < 11)
return 3;
else if(diff < 21)
return 10;
else if(diff < 31)
return 25;
else if(diff < 41)
return 35;
else if(diff < 51)
return 40;
else
return 60;
}
inline int MainWindow::txt_length_to_pix(int txt_length) const
{
return txt_length * 10;
}
void MainWindow::boxMainChange(Gtk::Allocation& a)
{
if(txt_length_to_pix(txt_exp_.get_text_length()) >
txt_exp_.get_width())
return;
if(win_width_ < get_width())
{
txt_exp_.set_size_request(txt_exp_.get_width() +
getSize(a.get_width() - win_width_), -1);
txt_ans_.set_size_request(txt_ans_.get_width() +
getSize(a.get_width() - win_width_), -1);
win_width_ = a.get_width();
}
else if (win_width_ > get_width())
{
txt_exp_.set_size_request(txt_exp_.get_width() -
getSize(win_width_ - a.get_width()), -1);
txt_ans_.set_size_request(txt_ans_.get_width() -
getSize(win_width_ - a.get_width()), -1);
win_width_ = a.get_width();
}
//return false;
}
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