GTK gossip: gtkframe and gtkaspectframe

Gtkframe is a sub-class of gtkcontainer. It can contain sub-components and contain an external frame and text:

Gtkcontainer


+ ---- Gtkbin


+ ---- Gtkframe

You can use gtk_frame_new () to create a gtkframe and specify the cursor text when creating it, or use gtk_frame_set_label later.
() Set the text. Set the text position to the upper left corner of the text. You can use gtk_frame_set_label_align () to set the text position of the text:

Gtkwidget * gtk_frame_new (const gchar * label );



Void gtk_frame_set_label (gtkframe * frame,



Const gchar * label );



Void gtk_frame_set_label_align (gtkframe * frame,

Gfloat xalign,


Gfloat
Yalign );

Gtk_frame_set_label_align () can be used to set xalign and yalign. The value ranges from 0.0 to 1.0. xalign can set horizontal comparison and yalign to set vertical comparison of text. You can also use gtk_frame_set_shadow_type () to set the external frame format:

Void gtk_frame_set_shadow_type (gtkframe * frame,


Gtkshadowtype
Type );

The following program is a simple configuration example:

• Gtk_frame_demo.c

#include <gtk/gtk.h>

int main(int argc, char *argv[]) {
    GtkWidget *window;
    GtkWidget *frame;

    gtk_init(&argc, &argv);

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window), "GtkFrame");
    gtk_window_set_default_size(GTK_WINDOW(window), 200, 150);

    frame = gtk_frame_new("caterpillar");
    gtk_frame_set_label_align(GTK_FRAME(frame), 0.5, 0.5);
    gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_ETCHED_OUT);

    gtk_container_add(GTK_CONTAINER(window), frame);

    g_signal_connect(GTK_OBJECT(window), "destroy",
                     G_CALLBACK(gtk_main_quit), NULL);

    gtk_widget_show_all(window);

    gtk_main();

    return 0;
}

The following figure shows the result of a line:

Gtkaspectframe is a sub-class of gtkframe. It is similar to gtkframe, but it is determined by the xsize/ysize ratio. It can be used to limit the length ratio of sub-components:

Gtkwidget * gtk_aspect_frame_new (const gchar * label,



Gfloat xalign,



Gfloat yalign,



Gfloat ratio,



Gboolean obey_child );

The role of xalign and yalign is the same as that of gtkframe. ratio is the ratio setting. When obey_child is set to true, it indicates that it is indicated by the length ratio of the Child component. If it is set to false, according to the ratio of ratio.

The following example shows a simple example. The ratio of the gtkaspectframe is set to 2 (xsize/ysize). Therefore, the ratio of the parameter component is as follows:

• Gtk_aspect_frame_demo.c
  

#include <gtk/gtk.h>

int main(int argc, char *argv[]) {
    GtkWidget *window;
    GtkWidget *frame;
    GtkWidget *button;

    gtk_init(&argc, &argv);

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window), "GtkAspectFrame");
    gtk_window_set_default_size(GTK_WINDOW(window), 300, 300);

    frame = gtk_aspect_frame_new("caterpillar", 0.5, 0.5, 2, FALSE);
    gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_ETCHED_OUT);

    button = gtk_button_new_with_label("Press");
    gtk_container_add(GTK_CONTAINER(frame), button);
    gtk_container_add(GTK_CONTAINER(window), frame);

    g_signal_connect(GTK_OBJECT(window), "destroy",
                     G_CALLBACK(gtk_main_quit), NULL);

    gtk_widget_show_all(window);

    gtk_main();

    return 0;
}

The results of a line are as follows: