feat: add gtk3 examples
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#include <gtk/gtk.h>
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static void activate (GtkApplication* app, gpointer user_data)
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{
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GtkWidget *window;
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/*create new object and store it at the pointer*/
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window = gtk_application_window_new (app);
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/*set window title*/
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/*cast pointer using the macro GTK_WINDOW() instead of C cast*/
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gtk_window_set_title (GTK_WINDOW (window), "Window Title");
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/*set window size*/
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gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);
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/*make window visible*/
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gtk_widget_show_all (window);
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}
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/*create a GtkApplication object and run it*/
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int main (int argc, char **argv)
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{
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GtkApplication *app;
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int status;
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/*initialise pointer with app id (name) and without flags*/
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app = gtk_application_new ("de.swingbe.gtk.example0", G_APPLICATION_FLAGS_NONE);
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/*connect the active signal with the active function defined above*/
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g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
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/*launch app and pass through arguments*/
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status = g_application_run (G_APPLICATION (app), argc, argv);
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g_object_unref (app);
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return status;
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}
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CC ?= gcc
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PKGCONFIG = $(shell which pkg-config)
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CFLAGS = $(shell $(PKGCONFIG) --cflags gtk+-3.0)
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LIBS = $(shell $(PKGCONFIG) --libs gtk+-3.0)
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SRC = exampleapp.c
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OBJS = $(SRC:.c=.o)
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all: exampleapp
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%.o: %.c
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$(CC) -c -o $(@F) $(CFLAGS) $<
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exampleapp: $(OBJS)
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$(CC) -o $(@F) $(OBJS) $(LIBS)
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clean:
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rm -f $(OBJS)
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rm -f exampleapp
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* build
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```
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gcc `pkg-config --cflags gtk+-3.0` -o example-1 example-1.c `pkg-config --libs gtk+-3.0`
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```
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#include <gtk/gtk.h>
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static void print_hello (GtkWidget *widget,
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gpointer data)
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{
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/*print in a terminal*/
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g_print ("Clicked\n");
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}
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static void
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activate (GtkApplication *app,
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gpointer user_data)
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{
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GtkWidget *window;
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GtkWidget *button;
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/*controlling button size and layout by storing it inside a box*/
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GtkWidget *button_box;
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window = gtk_application_window_new (app);
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gtk_window_set_title (GTK_WINDOW (window), "Title");
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gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);
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/*create and assigen box with orientation*/
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button_box = gtk_button_box_new (GTK_ORIENTATION_HORIZONTAL);
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/*add button box to window*/
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gtk_container_add (GTK_CONTAINER (window), button_box);
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/*initialise button*/
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button = gtk_button_new_with_label ("Button");
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/*connect button with callback function with NULL as input*/
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g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
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/*connect button with destroy callback to destroy the window instead of the button*/
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g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
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/*add button to window*/
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gtk_container_add (GTK_CONTAINER (button_box), button);
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gtk_widget_show_all (window);
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}
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int
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main (int argc,
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char **argv)
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{
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GtkApplication *app;
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int status;
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app = gtk_application_new ("org.gtk.example", G_APPLICATION_FLAGS_NONE);
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g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
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status = g_application_run (G_APPLICATION (app), argc, argv);
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g_object_unref (app);
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return status;
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}
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CC ?= gcc
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PKGCONFIG = $(shell which pkg-config)
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CFLAGS = $(shell $(PKGCONFIG) --cflags gtk+-3.0)
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LIBS = $(shell $(PKGCONFIG) --libs gtk+-3.0)
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SRC = exampleapp.c
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OBJS = $(SRC:.c=.o)
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all: exampleapp
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%.o: %.c
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$(CC) -c -o $(@F) $(CFLAGS) $<
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exampleapp: $(OBJS)
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$(CC) -o $(@F) $(OBJS) $(LIBS)
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clean:
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rm -f $(OBJS)
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rm -f exampleapp
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* build
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```
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gcc `pkg-config --cflags gtk+-3.0` -o example-1 example-1.c `pkg-config --libs gtk+-3.0`
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```
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#include <gtk/gtk.h>
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static void
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print_hello (GtkWidget *widget,
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gpointer data)
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{
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g_print ("Hello World\n");
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}
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static void
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activate (GtkApplication *app,
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gpointer user_data)
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{
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GtkWidget *window;
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GtkWidget *grid;
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GtkWidget *button;
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/* create a new window, and set its title */
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window = gtk_application_window_new (app);
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gtk_window_set_title (GTK_WINDOW (window), "Window");
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gtk_container_set_border_width (GTK_CONTAINER (window), 10);
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/* Here we construct the container that is going pack our buttons */
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grid = gtk_grid_new ();
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/* Pack the container in the window */
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gtk_container_add (GTK_CONTAINER (window), grid);
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button = gtk_button_new_with_label ("Button 1");
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g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
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/* Place the first button in the grid cell (0, 0), and make it fill
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* just 1 cell horizontally and vertically (ie no spanning)
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*/
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gtk_grid_attach (GTK_GRID (grid), button, 0, 0, 1, 1);
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button = gtk_button_new_with_label ("Button 2");
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g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
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/* Place the second button in the grid cell (1, 0), and make it fill
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* just 1 cell horizontally and vertically (ie no spanning)
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*/
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gtk_grid_attach (GTK_GRID (grid), button, 1, 0, 1, 1);
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button = gtk_button_new_with_label ("Quit");
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g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
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/* Place the Quit button in the grid cell (0, 1), and make it
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* span 2 columns.
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*/
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gtk_grid_attach (GTK_GRID (grid), button, 0, 1, 2, 1);
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/* Now that we are done packing our widgets, we show them all
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* in one go, by calling gtk_widget_show_all() on the window.
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* This call recursively calls gtk_widget_show() on all widgets
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* that are contained in the window, directly or indirectly.
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*/
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gtk_widget_show_all (window);
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}
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int
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main (int argc,
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char **argv)
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{
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GtkApplication *app;
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int status;
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app = gtk_application_new ("org.gtk.example", G_APPLICATION_FLAGS_NONE);
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g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
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status = g_application_run (G_APPLICATION (app), argc, argv);
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g_object_unref (app);
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return status;
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}
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@ -0,0 +1,23 @@
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CC ?= gcc
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PKGCONFIG = $(shell which pkg-config)
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CFLAGS = $(shell $(PKGCONFIG) --cflags gtk+-3.0)
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LIBS = $(shell $(PKGCONFIG) --libs gtk+-3.0)
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SRC = exampleapp.c
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OBJS = $(SRC:.c=.o)
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all: exampleapp
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%.o: %.c
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$(CC) -c -o $(@F) $(CFLAGS) $<
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exampleapp: $(OBJS)
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$(CC) -o $(@F) $(OBJS) $(LIBS)
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clean:
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rm -f $(OBJS)
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rm -f exampleapp
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* build
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```
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gcc `pkg-config --cflags gtk+-3.0` -o example-2 example-2.c `pkg-config --libs gtk+-3.0`
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```
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<interface>
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<object id="window" class="GtkWindow">
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<property name="visible">True</property>
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<property name="title">Grid</property>
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<property name="border-width">10</property>
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<child>
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<object id="grid" class="GtkGrid">
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<property name="visible">True</property>
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<child>
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<object id="button1" class="GtkButton">
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<property name="visible">True</property>
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<property name="label">Button 1</property>
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</object>
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<packing>
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<property name="left-attach">0</property>
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<property name="top-attach">0</property>
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</packing>
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</child>
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<child>
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<object id="button2" class="GtkButton">
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<property name="visible">True</property>
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<property name="label">Button 2</property>
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</object>
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<packing>
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<property name="left-attach">1</property>
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<property name="top-attach">0</property>
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</packing>
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</child>
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<child>
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<object id="quit" class="GtkButton">
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<property name="visible">True</property>
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<property name="label">Quit</property>
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</object>
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<packing>
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<property name="left-attach">0</property>
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<property name="top-attach">1</property>
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<property name="width">2</property>
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</packing>
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</child>
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</object>
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<packing>
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</packing>
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</child>
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</object>
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</interface>
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#include <gtk/gtk.h>
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static void
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print_hello (GtkWidget *widget,
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gpointer data)
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{
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g_print ("Hello World\n");
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}
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int
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main (int argc,
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char *argv[])
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{
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GtkBuilder *builder;
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GObject *window;
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GObject *button;
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GError *error = NULL;
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gtk_init (&argc, &argv);
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/* Construct a GtkBuilder instance and load our UI description */
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builder = gtk_builder_new ();
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if (gtk_builder_add_from_file (builder, "builder.ui", &error) == 0)
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{
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g_printerr ("Error loading file: %s\n", error->message);
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g_clear_error (&error);
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return 1;
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}
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/* Connect signal handlers to the constructed widgets. */
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window = gtk_builder_get_object (builder, "window");
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g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
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button = gtk_builder_get_object (builder, "button1");
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g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
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button = gtk_builder_get_object (builder, "button2");
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g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
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button = gtk_builder_get_object (builder, "quit");
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g_signal_connect (button, "clicked", G_CALLBACK (gtk_main_quit), NULL);
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gtk_main ();
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return 0;
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}
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@ -0,0 +1,23 @@
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CC ?= gcc
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PKGCONFIG = $(shell which pkg-config)
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CFLAGS = $(shell $(PKGCONFIG) --cflags gtk+-3.0)
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LIBS = $(shell $(PKGCONFIG) --libs gtk+-3.0)
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SRC = exampleapp.c
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OBJS = $(SRC:.c=.o)
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all: exampleapp
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%.o: %.c
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$(CC) -c -o $(@F) $(CFLAGS) $<
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exampleapp: $(OBJS)
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$(CC) -o $(@F) $(OBJS) $(LIBS)
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clean:
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rm -f $(OBJS)
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rm -f exampleapp
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* build manually
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```
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gcc `pkg-config --cflags gtk+-3.0` -o example-3 example-3.c `pkg-config --libs gtk+-3.0`
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```
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* or build using ```make``` instruction
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