An Introduction to C & GUI Programming -----Simon Long 学习笔记 5

这一讲讲用户输入的处理

#include <gtk/gtk.h>
GtkWidget *txt;

void end_program (GtkWidget *wid, gpointer ptr)
{
    printf("bybye
");
    gtk_main_quit ();
}

void copy_text (GtkWidget *wid, gpointer ptr)
{
    const char *input = gtk_entry_get_text (GTK_ENTRY (txt));
    gtk_label_set_text (GTK_LABEL (ptr), input);
}

int main (int argc, char *argv[])
{
    gtk_init (&argc, &argv);

    GtkWidget *win1 = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    GtkWidget *win2 = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title (GTK_WINDOW(win1), "QT");
    gtk_window_set_title (GTK_WINDOW(win2), "GTK");

    GtkWidget *btn1 = gtk_button_new_with_label ("Close window1");
    GtkWidget *btn2 = gtk_button_new_with_label ("copy right");
    GtkWidget *btn3 = gtk_button_new_with_label ("copy left");

    GtkWidget *labelA = gtk_label_new ("LABELA");
    GtkWidget *labelB = gtk_label_new ("LABELB");
    txt = gtk_entry_new ();
    GtkWidget *table1 = gtk_grid_new ();
    GtkWidget *table2 = gtk_grid_new ();

    gtk_grid_attach (GTK_GRID (table1), labelA, 0, 0, 10, 10);
    gtk_grid_attach (GTK_GRID (table1), btn1, 20, 20, 10, 10);
    gtk_grid_attach (GTK_GRID (table1), btn3, 40, 40, 10, 10);
    gtk_grid_attach (GTK_GRID (table2), labelB, 0, 0, 10, 10);
    gtk_grid_attach (GTK_GRID (table2), btn2, 10, 10, 10, 10);
    gtk_grid_attach (GTK_GRID (table2), txt, 0, 20, 10, 10);


    g_signal_connect (btn1, "clicked", G_CALLBACK (end_program), NULL);
    g_signal_connect (btn2, "clicked", G_CALLBACK (copy_text), labelB);
    g_signal_connect (btn2, "clicked", G_CALLBACK (copy_text), labelA);
    g_signal_connect (btn3, "clicked", G_CALLBACK (copy_text), labelB);
    g_signal_connect (btn3, "clicked", G_CALLBACK (copy_text), labelA);
    g_signal_connect (win2, "delete_event", G_CALLBACK (end_program), NULL);

    gtk_container_add (GTK_CONTAINER (win1), table1);
    gtk_container_add (GTK_CONTAINER (win2), table2);

    gtk_widget_show_all (win1);
    gtk_widget_show_all (win2);
    gtk_main ();
    return 0;
}

编译  gcc `pkg-config --cflags gtk+-3.0` test.c -o hello `pkg-config --libs gtk+-3.0`

结果

没输入任何字符时

 输入字符然后点击copy right或者copy left时

 另一种输入方式，有选择的输入

#include <gtk/gtk.h>
GtkWidget *txt;

void end_program (GtkWidget *wid, gpointer ptr)
{
    printf("bybye
");
    gtk_main_quit ();
}

void copy_text (GtkWidget *wid, gpointer ptr)
{
    const char *input = gtk_entry_get_text (GTK_ENTRY (txt));
    gtk_label_set_text (GTK_LABEL (ptr), input);
}

int main (int argc, char *argv[])
{
    gtk_init (&argc, &argv);

    GtkWidget *win1 = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    GtkWidget *win2 = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title (GTK_WINDOW(win1), "QT");
    gtk_window_set_title (GTK_WINDOW(win2), "GTK");

    GtkWidget *btn1 = gtk_button_new_with_label ("Close window1");
    GtkWidget *btn2 = gtk_button_new_with_label ("copy right");
    GtkWidget *btn3 = gtk_button_new_with_label ("copy left");

    GtkWidget *labelA = gtk_label_new ("LABELA");
    GtkWidget *labelB = gtk_label_new ("LABELB");
    GtkAdjustment  *adj = gtk_adjustment_new (0, -10, 10, 1, 0, 0);
    txt = gtk_spin_button_new (adj, 0, 0);

    GtkWidget *table1 = gtk_grid_new ();
    GtkWidget *table2 = gtk_grid_new ();

    gtk_grid_attach (GTK_GRID (table1), labelA, 0, 0, 10, 10);
    gtk_grid_attach (GTK_GRID (table1), btn1, 20, 20, 10, 10);
    gtk_grid_attach (GTK_GRID (table1), btn3, 40, 40, 10, 10);
    gtk_grid_attach (GTK_GRID (table2), labelB, 0, 0, 10, 10);
    gtk_grid_attach (GTK_GRID (table2), btn2, 10, 10, 10, 10);
    gtk_grid_attach (GTK_GRID (table2), txt, 0, 20, 10, 10);


    g_signal_connect (btn1, "clicked", G_CALLBACK (end_program), NULL);
    g_signal_connect (btn2, "clicked", G_CALLBACK (copy_text), labelB);
    g_signal_connect (btn2, "clicked", G_CALLBACK (copy_text), labelA);
    g_signal_connect (btn3, "clicked", G_CALLBACK (copy_text), labelB);
    g_signal_connect (btn3, "clicked", G_CALLBACK (copy_text), labelA);
    g_signal_connect (win2, "delete_event", G_CALLBACK (end_program), NULL);

    gtk_container_add (GTK_CONTAINER (win1), table1);
    gtk_container_add (GTK_CONTAINER (win2), table2);

    gtk_widget_show_all (win1);
    gtk_widget_show_all (win2);
    gtk_main ();
    return 0;
}

结果：可以从0变到10，或者0变到-10

gtk_adjustment_new (0, -10, 10, 1, 0, 0);   // 初始值0,最小值-10,最大值10, 鼠标左键每次递增1(最右边2个是the page increment和the page size)

详细见https://developer.gnome.org/gtk3/stable/GtkAdjustment.html#gtk-adjustment-new

 变到10后在点击copy按键

 另一种单选输入

#include <gtk/gtk.h>
GtkWidget *txt;

void end_program (GtkWidget *wid, gpointer ptr)
{
    printf("bybye
");
    gtk_main_quit ();
}

void copy_text (GtkWidget *wid, gpointer ptr)
{
    const char *input = gtk_entry_get_text (GTK_ENTRY (txt));
    gtk_label_set_text (GTK_LABEL (ptr), input);
}

void check_toggle (GtkWidget *wid, gpointer ptr)
{
    static int i = 0;
    i++;
    char arr[60] = {0};
    sprintf(arr, "The state of the button checked %d times
", i);
    printf ("The state of the button is %d
", gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (wid)));
    gtk_label_set_text (GTK_LABEL (ptr), arr);
}

int main (int argc, char *argv[])
{
    gtk_init (&argc, &argv);

    GtkWidget *win1 = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    GtkWidget *win2 = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title (GTK_WINDOW(win1), "QT");
    gtk_window_set_title (GTK_WINDOW(win2), "GTK");

    GtkWidget *btn1 = gtk_button_new_with_label ("Close window1");
    GtkWidget *btn2 = gtk_button_new_with_label ("copy right");
    GtkWidget *btn3 = gtk_button_new_with_label ("copy left");

    GtkWidget *chk1 = gtk_check_button_new_with_label ("My check");
    GtkWidget *chk2 = gtk_check_button_new_with_label ("check");
    gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (chk1), FALSE);   //  设置默认勾选状态
    gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (chk2), TRUE);  //  设置默认勾选状态

    GtkWidget *labelA = gtk_label_new ("LABELA");
    GtkWidget *labelB = gtk_label_new ("LABELB");
    GtkAdjustment  *adj = gtk_adjustment_new (0, -100, 100, 1, 50, 0);
    txt = gtk_spin_button_new (adj, 0, 0);

    GtkWidget *table1 = gtk_grid_new ();
    GtkWidget *table2 = gtk_grid_new ();

    gtk_grid_attach (GTK_GRID (table1), labelA, 0, 0, 10, 10);
    gtk_grid_attach (GTK_GRID (table1), btn1, 20, 20, 10, 10);
    gtk_grid_attach (GTK_GRID (table1), btn3, 40, 40, 10, 10);
    gtk_grid_attach (GTK_GRID (table1), chk1, 60, 60, 10, 10);
    gtk_grid_attach (GTK_GRID (table2), labelB, 0, 0, 10, 10);
    gtk_grid_attach (GTK_GRID (table2), btn2, 10, 10, 10, 10);
    gtk_grid_attach (GTK_GRID (table2), txt, 0, 20, 10, 10);
    gtk_grid_attach (GTK_GRID (table2), chk2, 20, 20, 10, 10);


    g_signal_connect (btn1, "clicked", G_CALLBACK (end_program), NULL);
    g_signal_connect (btn2, "clicked", G_CALLBACK (copy_text), labelB);
    g_signal_connect (btn2, "clicked", G_CALLBACK (copy_text), labelA);
    g_signal_connect (btn3, "clicked", G_CALLBACK (copy_text), labelB);
    g_signal_connect (btn3, "clicked", G_CALLBACK (copy_text), labelA);
    g_signal_connect (win2, "delete_event", G_CALLBACK (end_program), NULL);
    g_signal_connect (chk1, "toggled", G_CALLBACK (check_toggle),labelA);

    gtk_container_add (GTK_CONTAINER (win1), table1);
    gtk_container_add (GTK_CONTAINER (win2), table2);

    gtk_widget_show_all (win1);
    gtk_widget_show_all (win2);
    gtk_main ();
    return 0;
}

结果