textview.c

Linux下gtk图形界面开发的各种gtk控件调用方法示例

/* Text Widget/Multiple Views
 *
 * The GtkTextView widget displays a GtkTextBuffer. One GtkTextBuffer
 * can be displayed by multiple GtkTextViews. This demo has two views
 * displaying a single buffer, and shows off the widget's text
 * formatting features.
 *
 */

#include <gtk/gtk.h>
#include <stdlib.h> /* for exit() */

#include "demo-common.h"

static void easter_egg_callback (GtkWidget *button, gpointer data);

#define gray50_width 2
#define gray50_height 2
static char gray50_bits[] = {
  0x02, 0x01
};

static void
create_tags (GtkTextBuffer *buffer)
{
  GdkBitmap *stipple;

  /* Create a bunch of tags. Note that it's also possible to
   * create tags with gtk_text_tag_new() then add them to the
   * tag table for the buffer, gtk_text_buffer_create_tag() is
   * just a convenience function. Also note that you don't have
   * to give tags a name; pass NULL for the name to create an
   * anonymous tag.
   *
   * In any real app, another useful optimization would be to create
   * a GtkTextTagTable in advance, and reuse the same tag table for
   * all the buffers with the same tag set, instead of creating
   * new copies of the same tags for every buffer.
   *
   * Tags are assigned default priorities in order of addition to the
   * tag table.	 That is, tags created later that affect the same text
   * property affected by an earlier tag will override the earlier
   * tag.  You can modify tag priorities with
   * gtk_text_tag_set_priority().
   */

  gtk_text_buffer_create_tag (buffer, "heading",
			      "weight", PANGO_WEIGHT_BOLD,
			      "size", 15 * PANGO_SCALE,
			      NULL);
  
  gtk_text_buffer_create_tag (buffer, "italic",
			      "style", PANGO_STYLE_ITALIC, NULL);

  gtk_text_buffer_create_tag (buffer, "bold",
			      "weight", PANGO_WEIGHT_BOLD, NULL);  
  
  gtk_text_buffer_create_tag (buffer, "big",
			      /* points times the PANGO_SCALE factor */
			      "size", 20 * PANGO_SCALE, NULL);

  gtk_text_buffer_create_tag (buffer, "xx-small",
			      "scale", PANGO_SCALE_XX_SMALL, NULL);

  gtk_text_buffer_create_tag (buffer, "x-large",
			      "scale", PANGO_SCALE_X_LARGE, NULL);
  
  gtk_text_buffer_create_tag (buffer, "monospace",
			      "family", "monospace", NULL);
  
  gtk_text_buffer_create_tag (buffer, "blue_foreground",
			      "foreground", "blue", NULL);  

  gtk_text_buffer_create_tag (buffer, "red_background",
			      "background", "red", NULL);

  stipple = gdk_bitmap_create_from_data (NULL,
					 gray50_bits, gray50_width,
					 gray50_height);
  
  gtk_text_buffer_create_tag (buffer, "background_stipple",
			      "background_stipple", stipple, NULL);

  gtk_text_buffer_create_tag (buffer, "foreground_stipple",
			      "foreground_stipple", stipple, NULL);

  g_object_unref (stipple);

  gtk_text_buffer_create_tag (buffer, "big_gap_before_line",
			      "pixels_above_lines", 30, NULL);

  gtk_text_buffer_create_tag (buffer, "big_gap_after_line",
			      "pixels_below_lines", 30, NULL);

  gtk_text_buffer_create_tag (buffer, "double_spaced_line",
			      "pixels_inside_wrap", 10, NULL);

  gtk_text_buffer_create_tag (buffer, "not_editable",
			      "editable", FALSE, NULL);
  
  gtk_text_buffer_create_tag (buffer, "word_wrap",
			      "wrap_mode", GTK_WRAP_WORD, NULL);

  gtk_text_buffer_create_tag (buffer, "char_wrap",
			      "wrap_mode", GTK_WRAP_CHAR, NULL);

  gtk_text_buffer_create_tag (buffer, "no_wrap",
			      "wrap_mode", GTK_WRAP_NONE, NULL);
  
  gtk_text_buffer_create_tag (buffer, "center",
			      "justification", GTK_JUSTIFY_CENTER, NULL);

  gtk_text_buffer_create_tag (buffer, "right_justify",
			      "justification", GTK_JUSTIFY_RIGHT, NULL);

  gtk_text_buffer_create_tag (buffer, "wide_margins",
			      "left_margin", 50, "right_margin", 50,
			      NULL);
  
  gtk_text_buffer_create_tag (buffer, "strikethrough",
			      "strikethrough", TRUE, NULL);
  
  gtk_text_buffer_create_tag (buffer, "underline",
			      "underline", PANGO_UNDERLINE_SINGLE, NULL);

  gtk_text_buffer_create_tag (buffer, "double_underline",
			      "underline", PANGO_UNDERLINE_DOUBLE, NULL);

  gtk_text_buffer_create_tag (buffer, "superscript",
			      "rise", 10 * PANGO_SCALE,	  /* 10 pixels */
			      "size", 8 * PANGO_SCALE,	  /* 8 points */
			      NULL);
  
  gtk_text_buffer_create_tag (buffer, "subscript",
			      "rise", -10 * PANGO_SCALE,   /* 10 pixels */
			      "size", 8 * PANGO_SCALE,	   /* 8 points */
			      NULL);

  gtk_text_buffer_create_tag (buffer, "rtl_quote",
			      "wrap_mode", GTK_WRAP_WORD,
			      "direction", GTK_TEXT_DIR_RTL,
			      "indent", 30,
			      "left_margin", 20,
			      "right_margin", 20,
			      NULL);
}

static void
insert_text (GtkTextBuffer *buffer)
{
  GtkTextIter iter;
  GtkTextIter start, end;
  GdkPixbuf *pixbuf;
  GdkPixbuf *scaled;
  GtkTextChildAnchor *anchor;
  char *filename;

  /* demo_find_file() looks in the current directory first,
   * so you can run gtk-demo without installing GTK, then looks
   * in the location where the file is installed.
   */
  pixbuf = NULL;
  filename = demo_find_file ("gtk-logo-rgb.gif", NULL);
  if (filename)
    {
      pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
      g_free (filename);
    }

  if (pixbuf == NULL)
    {
      g_printerr ("Failed to load image file gtk-logo-rgb.gif\n");
      exit (1);
    }

  scaled = gdk_pixbuf_scale_simple (pixbuf, 32, 32, GDK_INTERP_BILINEAR);
  g_object_unref (pixbuf);
  pixbuf = scaled;
  
  /* get start of buffer; each insertion will revalidate the
   * iterator to point to just after the inserted text.
   */
  gtk_text_buffer_get_iter_at_offset (buffer, &iter, 0);

  gtk_text_buffer_insert (buffer, &iter, "The text widget can display text with all kinds of nifty attributes. It also supports multiple views of the same buffer; this demo is showing the same buffer in two places.\n\n", -1);

  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter, "Font styles. ", -1,
					    "heading", NULL);
  
  gtk_text_buffer_insert (buffer, &iter, "For example, you can have ", -1);
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "italic", -1,
					    "italic", NULL);
  gtk_text_buffer_insert (buffer, &iter, ", ", -1);  
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "bold", -1,
					    "bold", NULL);
  gtk_text_buffer_insert (buffer, &iter, ", or ", -1);
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "monospace (typewriter)", -1,
					    "monospace", NULL);
  gtk_text_buffer_insert (buffer, &iter, ", or ", -1);
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "big", -1,
					    "big", NULL);
  gtk_text_buffer_insert (buffer, &iter, " text. ", -1);
  gtk_text_buffer_insert (buffer, &iter, "It's best not to hardcode specific text sizes; you can use relative sizes as with CSS, such as ", -1);
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "xx-small", -1,
					    "xx-small", NULL);
  gtk_text_buffer_insert (buffer, &iter, " or ", -1);
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "x-large", -1,
					    "x-large", NULL);
  gtk_text_buffer_insert (buffer, &iter, " to ensure that your program properly adapts if the user changes the default font size.\n\n", -1);
  
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter, "Colors. ", -1,
					    "heading", NULL);
  
  gtk_text_buffer_insert (buffer, &iter, "Colors such as ", -1);  
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "a blue foreground", -1,
					    "blue_foreground", NULL);
  gtk_text_buffer_insert (buffer, &iter, " or ", -1);  
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "a red background", -1,
					    "red_background", NULL);
  gtk_text_buffer_insert (buffer, &iter, " or even ", -1);  
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "a stippled red background", -1,
					    "red_background",
					    "background_stipple",
					    NULL);

  gtk_text_buffer_insert (buffer, &iter, " or ", -1);  
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "a stippled blue foreground on solid red background", -1,
					    "blue_foreground",
					    "red_background",
					    "foreground_stipple",
					    NULL);
  gtk_text_buffer_insert (buffer, &iter, " (select that to read it) can be used.\n\n", -1);  

  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter, "Underline, strikethrough, and rise. ", -1,
					    "heading", NULL);
  
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "Strikethrough", -1,
					    "strikethrough", NULL);
  gtk_text_buffer_insert (buffer, &iter, ", ", -1);
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "underline", -1,
					    "underline", NULL);
  gtk_text_buffer_insert (buffer, &iter, ", ", -1);
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "double underline", -1, 
					    "double_underline", NULL);
  gtk_text_buffer_insert (buffer, &iter, ", ", -1);
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "superscript", -1,
					    "superscript", NULL);
  gtk_text_buffer_insert (buffer, &iter, ", and ", -1);
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "subscript", -1,
					    "subscript", NULL);
  gtk_text_buffer_insert (buffer, &iter, " are all supported.\n\n", -1);

  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter, "Images. ", -1,
					    "heading", NULL);
  
  gtk_text_buffer_insert (buffer, &iter, "The buffer can have images in it: ", -1);
  gtk_text_buffer_insert_pixbuf (buffer, &iter, pixbuf);
  gtk_text_buffer_insert_pixbuf (buffer, &iter, pixbuf);
  gtk_text_buffer_insert_pixbuf (buffer, &iter, pixbuf);
  gtk_text_buffer_insert (buffer, &iter, " for example.\n\n", -1);

  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter, "Spacing. ", -1,
					    "heading", NULL);

  gtk_text_buffer_insert (buffer, &iter, "You can adjust the amount of space before each line.\n", -1);
  
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "This line has a whole lot of space before it.\n", -1,
					    "big_gap_before_line", "wide_margins", NULL);
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "You can also adjust the amount of space after each line; this line has a whole lot of space after it.\n", -1,
					    "big_gap_after_line", "wide_margins", NULL);
  
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "You can also adjust the amount of space between wrapped lines; this line has extra space between each wrapped line in the same paragraph. To show off wrapping, some filler text: the quick brown fox jumped over the lazy dog. Blah blah blah blah blah blah blah blah blah.\n", -1,
					    "double_spaced_line", "wide_margins", NULL);

  gtk_text_buffer_insert (buffer, &iter, "Also note that those lines have extra-wide margins.\n\n", -1);

  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter, "Editability. ", -1,
					    "heading", NULL);
  
  gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
					    "This line is 'locked down' and can't be edited by the user - just try it! You can't delete this line.\n\n", -1,