i´m just working arround in GTK3 with an input field and found a problem what i do not understand. I can write in the field gtk_entry_new on TOPLEVEL modus but i can not in POPUP modus. Here is my shortened code (I kow this does noting but i is more easy to read):
#include <gtk/gtk.h>
int main(int argc, char **argv) {
gtk_init(&argc, &argv);
GtkWidget *window;
GtkWidget *inputfield;
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
inputfield = gtk_entry_new();
gtk_container_add(GTK_CONTAINER(window), inputfield);
//this two lines are make TOPLEVEL look like POPUP
gtk_window_set_decorated (GTK_WINDOW(window), FALSE);
gtk_window_set_resizable (GTK_WINDOW(window), FALSE);
gtk_widget_show_all(window);
gtk_main();
return 0;
}
When I change the line window = gtk_window_new(GTK_WINDOW_TOPLEVEL); to window = gtk_window_new(GTK_WINDOW_POPUP); I can not insert any characters into the field. Someone has a hint for me?
Related
I am programming on linux program and I am trying to prepare program with GTK+3, but I don't know how close program automatically after execute the function without kill that execute.
the step that i want in my program is:
open gtk window and this window there is button (open Xreader).
press button, it tells system to execute xreader program.
close gtk window automatically without needing to close xreader .
here is my code
#include<stdio.h>
#include<gtk/gtk.h>
static void
open_app(GtkWidget *Widget, gpointer data){
system("xreader");
gtk_main_quit();
}
int main(int argc, char *argv[])
{
GtkWidget *window;
GtkWidget *button1;
gtk_init(&argc, &argv);
/*make window */
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
/*give name to the window*/
gtk_window_set_title(GTK_WINDOW(window), "launcher");
/*make size of window*/
gtk_window_set_default_size(GTK_WINDOW(window), 700, 700);
/*open the window in the meddal*/
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
button1 = gtk_button_new_with_label("Open Xreader");
gtk_container_add(GTK_CONTAINER(window), button1);
gtk_widget_show_all(window);
g_signal_connect(button1,"clicked",G_CALLBACK(open_app), NULL);
g_signal_connect(window, "destroy",
G_CALLBACK(gtk_main_quit), NULL);
gtk_main();
return 0;
}
everytime trying to execute my program and press the button (open Xreader) gtk not close till close xreader .
You cannot use system here, because according to its documentation, https://man7.org/linux/man-pages/man3/system.3.html
system() returns after the command has been completed.
Since you are using gtk, don't forget library functions provided by glib. It has a bunch of functions related to process and thread handling. For example, you can use GSubprocess class from glib, g_subprocess_new.
#include <gtk/gtk.h>
#include <stdio.h>
#include <stdlib.h>
#include <glib.h>
static void open_app(GtkWidget *Widget, gpointer data) {
g_subprocess_new(G_SUBPROCESS_FLAGS_NONE, NULL, "xreader", NULL);
gtk_main_quit();
}
int main(int argc, char *argv[]) {
GtkWidget *window;
GtkWidget *button1;
gtk_init(&argc, &argv);
/*make window */
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
/*give name to the window*/
gtk_window_set_title(GTK_WINDOW(window), "launcher");
/*make size of window*/
gtk_window_set_default_size(GTK_WINDOW(window), 700, 700);
/*open the window in the meddal*/
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
button1 = gtk_button_new_with_label("Open Xreader");
gtk_container_add(GTK_CONTAINER(window), button1);
gtk_widget_show_all(window);
g_signal_connect(button1, "clicked", G_CALLBACK(open_app), NULL);
g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
gtk_main();
return 0;
}
I am trying to make UI using GTK in c for raspberry pi 4. I want to change the visibility of different widgets based on button click just to simulate a new page. I have tried everything available on the internet but as I am not that good at coding I cant figure out what is wrong.
can someone please help ?
This program compiles but when I press the button it gives error " assertion failed on gtk_widget_show " and also on widget hide. Also a segmentation fault occurs and the program crashes.
I am using cmake to compile my code. I have attached the error screen shot.
#include <gtk/gtk.h>
typedef struct AppData
{
GtkWidget *label1;
GtkWidget *label2;
} AppData;
static void button1 (gpointer data)
{
AppData *data2 = (AppData*)data;
gtk_widget_hide(data2->label1);
gtk_widget_show(data2->label2);
}
static void button2 ( gpointer data)
{
AppData *data2 = (AppData*)data;
gtk_widget_show(data2->label1);
gtk_widget_hide(data2->label2);
}
int main(int argc, char *argv[])
{
GtkWidget *window;
GtkWidget *fixed;
GtkWidget *btn1;
GtkWidget *btn2;
GtkWidget *box1;
GtkWidget *box2;
gtk_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), "ethercat test 1");
gtk_window_set_default_size(GTK_WINDOW(window), 1000,500);
fixed = gtk_fixed_new();
gtk_container_add(GTK_CONTAINER(window), fixed);
box1 = gtk_box_new(GTK_ORIENTATION_VERTICAL, 1);
gtk_fixed_put(GTK_FIXED(fixed), box1, 0,0);
box2 = gtk_box_new(GTK_ORIENTATION_VERTICAL, 1);
gtk_fixed_put(GTK_FIXED(fixed), box2, 100,100);
AppData *app_data = g_new0 (AppData, 2);
app_data->label1 = gtk_label_new("label1");
gtk_box_pack_start(GTK_BOX(box1),app_data->label1, TRUE,TRUE,0);
app_data->label2 = gtk_label_new("label2");
gtk_box_pack_start(GTK_BOX(box2),app_data->label2, TRUE,TRUE,0);
btn1 = gtk_button_new_with_label("ethercat 1");
gtk_fixed_put(GTK_FIXED(fixed), btn1, 10, 450);
gtk_widget_set_size_request(btn1, 80,30);
btn2 = gtk_button_new_with_label("ethercat 2");
gtk_fixed_put(GTK_FIXED(fixed), btn2, 110, 450);
gtk_widget_set_size_request(btn2, 80,30);
gtk_widget_show_all(window);
g_signal_connect(G_OBJECT(btn1), "clicked", G_CALLBACK(button1), app_data);
g_signal_connect(G_OBJECT(btn2), "clicked", G_CALLBACK(button2), app_data);
g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
gtk_main();
printf("program end\n");
return (0);
}
enter image description here
The function signature of your "clicked" callbacks is wrong. It should be of the form as described in the documentation:
void on_clicked(
GtkButton* self,
gpointer user_data
)
So for example, your button2() function becomes
static void button2 (GtkButton *btn2, gpointer data)
{
AppData *data2 = (AppData*)data;
gtk_widget_show(data2->label1);
gtk_widget_hide(data2->label2);
}
I'm in the process of creating a gtk2 application which I would like drawn over all other apps at all times, I would rather use xlib to do that if it is possible
here's my code so far:
#include <gtk/gtk.h>
int main(int argc, char **argv)
{
gtk_init(&argc, &argv);
GtkWidget *mainwin;
mainwin = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_widget_show_all (mainwin);
gtk_main ();
return 0;
}
I'd like to do this in the simplest manner possible
thanks
Yes it is possible and not complicated
#include <gtk/gtk.h>
int main(int argc, char **argv)
{
gtk_init(&argc, &argv);
GtkWidget *mainwin;
mainwin = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_keep_above ( (GtkWindow *) mainwin, TRUE);
gtk_widget_show_all (mainwin);
gtk_main ();
return 0;
}
gtk_window_set_keep_above does trick if window manager is cooperative.
This question already has an answer here:
save current window as image using gtk#
(1 answer)
Closed 4 years ago.
This is a piece of code which creates a window:
#include <gtk/gtk.h>
static GtkWidget* createWindow()
{
GtkWidget *window;
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size(GTK_WINDOW(window), 800, 600);
gtk_widget_set_name(window, "GtkLauncher");
g_signal_connect_swapped(G_OBJECT(window), "destroy",
G_CALLBACK(gtk_main_quit), NULL);
return window;
}
int main(int argc, char* argv[])
{
GtkWidget *main_window;
gtk_init(&argc, &argv);
if (!g_thread_supported())
g_thread_init(NULL);
main_window = createWindow();
gtk_widget_grab_focus(main_window);
gtk_widget_show_all(main_window);
gtk_main();
return 0;
}
And in here: Convert a GTK python script to C , i got how to take a screenshot.
gdk_get_default_root_window() will give me the screenshot of the desktop.
gdk_screen_get_active_window (gdk_screen_get_default()) will give me the screenshot of any active window.
Is there any way to take the screenshot of the window being created in the code above??
I think this should do it, although you may need to iterate the main loop after showing the window to get it to paint properly, in which case you'll need some more code (I haven't tested this)
#include <unistd.h>
#include <stdio.h>
#include <gtk/gtk.h>
#include <cairo.h>
static GtkWidget* createWindow()
{
GtkWidget *window;
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size(GTK_WINDOW(window), 800, 600);
gtk_widget_set_name(window, "GtkLauncher");
g_signal_connect_swapped(G_OBJECT(window), "destroy",
G_CALLBACK(gtk_main_quit), NULL);
return window;
}
int main(int argc, char **argv)
{
gdk_init(&argc, &argv);
GtkWidget *main_window = createWindow();
gtk_widget_show_all(main_window);
// may not need this, it also may not be enough either
while (gtk_events_pending ()) gtk_main_iteration ();
GdkWindow *w = GDK_WINDOW(main_window);
gint width, height;
gdk_drawable_get_size(GDK_DRAWABLE(w), &width, &height);
GdkPixbuf *pb = gdk_pixbuf_get_from_drawable(NULL,
GDK_DRAWABLE(w),
NULL,
0,0,0,0,width,height);
if(pb != NULL) {
gdk_pixbuf_save(pb, "screenshot.png", "png", NULL);
g_print("Screenshot saved to screenshot.png.\n");
} else {
g_print("Unable to get the screenshot.\n");
}
return 0;
}
If it doesn't work you'll have to move the screenshot taking into an event handler that connects to some event (I'm not sure which probably window-state-event then you have to look at the event to figure out when to take the screenshot)
How do I initialize a GtkScrolledWindow to avoid scrollbars by growing as much as possible?
By default it seems to be as small as possible.
Demo code (Quit with SIGINT):
#include <gtk/gtk.h>
int main(int argc, char *argv[]) {
GtkWidget* window;
GtkWidget* content;
GtkWidget* sw;
gtk_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
sw = gtk_scrolled_window_new(NULL, NULL);
gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(sw),
GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
gtk_container_add(GTK_CONTAINER(window), sw);
gtk_widget_show(sw);
content = gtk_button_new_with_label("This is a very, very"
"very very very very very very very very long text");
gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(sw), content);
gtk_widget_show(content);
gtk_widget_show(window);
gtk_main();
return 0;
}
I think this both works and is not an ugly hack (much):
int main(int argc, char *argv[]) {
GtkWidget* window;
GtkWidget* content;
GtkWidget* sw;
GtkRequisition size;
GtkWidget* viewport;
gtk_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
sw = gtk_scrolled_window_new(NULL, NULL);
gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(sw),
GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
gtk_container_add(GTK_CONTAINER(window), sw);
gtk_widget_show(sw);
content = gtk_button_new_with_label("This is a very, very"
"very very very very very very very very long text");
gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(sw), content);
gtk_widget_show(content);
gtk_widget_show(window);
viewport = gtk_widget_get_ancestor(content, GTK_TYPE_VIEWPORT);
gtk_widget_size_request(viewport, &size);
gtk_widget_set_size_request(sw, size.width, size.height);
gtk_main();
return 0;
}
I'm not sure what the proper way to do this is, but I've found that what works best for me is to set the size of the window, and the widgets contained within it usually size themselves correctly:
gtk_window_set_default_size(GTK_WINDOW(window), 1000, 500);
Alternatively, you can set the size of the GtkScrolledWindow:
gtk_widget_set_size_request(window, 500, 250);
Note that in especially this last case, localisation, font sizes, and other such details probably have to be considered when calculationg the size in pixels.