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c - 我很难使用 GTK 来绘制文本

问题描述

我尝试键入此代码以在屏幕上显示文本，但是当我编译然后打开已编译的应用程序时没有文本。为什么这行不通？我正在使用 C 和 Linux，我正在尝试使用 gtk 头文件。我究竟做错了什么？

#include <stdlib.h>
#include <gtk/gtk.h>

static void helloWorld (GtkWidget *wid, GtkWidget *win) {
    GtkWidget *dialog = NULL;

    dialog = gtk_message_dialog_new (GTK_WINDOW (win), GTK_DIALOG_MODAL, GTK_MESSAGE_INFO, GTK_BUTTONS_CLOSE, "Hello World! My name is ****");
    gtk_window_set_position (GTK_WINDOW (dialog), GTK_WIN_POS_CENTER);
    gtk_dialog_run (GTK_DIALOG (dialog));
    gtk_widget_destroy (dialog);
}

int main (int argc, char *argv[]) {
    GtkWidget *button = NULL;
    GtkWidget *win = NULL;  
    GtkWidget *vbox = NULL;

    /* Initialize GTK+ */
    g_log_set_handler ("Gtk", G_LOG_LEVEL_WARNING, (GLogFunc) gtk_false, NULL);
    gtk_init (&argc, &argv);
    g_log_set_handler ("Gtk", G_LOG_LEVEL_WARNING, g_log_default_handler, NULL);

    /* Create the main window */
    win = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_window_set_default_size(GTK_WINDOW (win), 400, 300);
    gtk_container_set_border_width (GTK_CONTAINER (win), 8);
    gtk_window_set_title (GTK_WINDOW (win), "The stupid GTK test");
    gtk_window_set_position (GTK_WINDOW (win), GTK_WIN_POS_CENTER);
    gtk_widget_realize (win);
    g_signal_connect (win, "destroy", gtk_main_quit, NULL);

    /* Create a vertical box with buttons*/

    vbox = gtk_vbox_new (TRUE, 6);
    gtk_container_add (GTK_CONTAINER (win), vbox);

    button = gtk_button_new_from_stock (GTK_STOCK_DIALOG_INFO);
    g_signal_connect (G_OBJECT (button), "clicked", G_CALLBACK (helloWorld), (gpointer) win);
    gtk_box_pack_start (GTK_BOX (vbox), button, TRUE, TRUE, 0);

    button = gtk_button_new_from_stock (GTK_STOCK_CLOSE);
    g_signal_connect (button, "clicked", gtk_main_quit, NULL);
    gtk_box_pack_start (GTK_BOX (vbox), button, TRUE, TRUE, 0);

    GtkWidget *view;
    GtkTextBuffer *buffer;
    GtkTextIter start, end;
    PangoFontDescription *font_desc;
    GdkColor color;
    GtkTextTag *tag;

    view = gtk_text_view_new ();

    buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));

    gtk_text_buffer_set_text (buffer, "Hello, this is some text", -1);

    /* Change default font throughout the widget */
    font_desc = pango_font_description_from_string ("Serif 15");
    gtk_widget_modify_font (view, font_desc);
    pango_font_description_free (font_desc);

    /* Change default color throughout the widget */
    gdk_color_parse ("green", &color);
    gtk_widget_modify_text (view, GTK_STATE_NORMAL, &color);

    /* Change left margin throughout the widget */
    gtk_text_view_set_left_margin (GTK_TEXT_VIEW (view), 30);

    /* Use a tag to change the color for just one part of the widget */
    tag = gtk_text_buffer_create_tag (buffer, "blue_foreground",
                            "foreground", "blue", NULL);  
    gtk_text_buffer_get_iter_at_offset (buffer, &start, 7);
    gtk_text_buffer_get_iter_at_offset (buffer, &end, 12);
    gtk_text_buffer_apply_tag (buffer, tag, &start, &end);
    /*Enter the main loop */
    gtk_widget_show_all (win);
    gtk_main ();
    return 0;
}

我怎样才能使这项工作？我希望它在编译然后打开时显示文本。我尝试了几件事，但都没有工作。

标签： cgtk

解决方案

您忘记将文本框添加到窗口上的某个位置，它实际上会显示在那里，就像这样

    gtk_box_pack_start (GTK_BOX (vbox), view, TRUE, TRUE, 0);

（必须在定义视图之后和调用 show_all 之前）。如果您查看您的代码，您会发现此调用是针对出现的所有其他小部件进行的。您的问题实际上并不特定于绘图文本。

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