Re: [gtkmm] Key press events not captured for some keys

[Bevis Peters <bevis anvil com>]

I've come across this bug.
I got round it by using the release event, but I'll try that 
connect_notify() and see what happens.


bevis

> I am using "on_key_press(GdkEvent *key)" method to get the values of key
> pressed, what i found was that for keys like "Enter", "Space Bar" and 
>  all
> arrow keys, no event key_press is generated.
>
> I wrote on_key_release_event(GdkEvent *key), the same keys "Enter",
> "Space bar" and  all arrow keys. It  generates the release event only. 
> i.e. no key
> press event is generated, but the release event is fired.
>
> I also noticed that for system reserved keys in KDE, like ALT-F1 for 
> Run command, CTRL-f2 is for desktop 2, when I pressed these keys, the 
> system executes them for its use before I can capture it.
>
> So my query is,
> 1. What is the code for capturing key press events ?
> 2. How to catch the system reserved keys before their execution by the 
> system ?
>
> Below is Code snippet for you to try out what I have stated above,
> Any help would be great appreciated,
> Regards,
> Ramachandra
>
>
>
> #include <stdio.h>
> #include <gdkmm/gc.h>
> #include <gdk/gdkkeysyms.h>
> #include <gtkmm/window.h>
> #include <gtkmm/main.h>
> class CWindow: public Gtk::Window
> {
>
>   public:
> CWindow();
> ~CWindow();
>
> bool on_window1_key_press_event(GdkEventKey *Key);
> bool on_window1_key_release_event(GdkEventKey *Key);
> };
>
> CWindow::CWindow(): Gtk::Window(Gtk::WINDOW_TOPLEVEL)
> {
> Gtk::Window *window1 = this;
>    window1->set_title("window1");
>    window1->set_modal(false);
>    window1->set_position(Gtk::WIN_POS_NONE);
>    window1->show();
>
> window1->signal_key_press_event().connect(SigC::slot(*this,&CWindow::on_window1_key_press_event));
>
> window1->signal_key_release_event().connect(SigC::slot(*this,&CWindow::on_window1_key_release_event));
> }
> CWindow::~CWindow()
> {
> }
> bool CWindow::on_window1_key_press_event(GdkEventKey *Key)
> {
> printf("\n Key Presssed is %s\n",gdk_keyval_name(Key->keyval));
> return true;
> }
>
> bool CWindow::on_window1_key_release_event(GdkEventKey *Key)
> {
> printf("\n Key Released is %s \n",gdk_keyval_name(Key->keyval));
> return true;
> }
>
>
> int main(int argc, char **argv)
> {
>
>     Gtk::Main m(argc, argv);
> CWindow *ptrWindow = new class CWindow();
> m.run(*ptrWindow);
> delete ptrWindow;
> ptrWindow = 0;
> return 0;
> }