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Havoc Pennington
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demos/gtk-demo/textview.c
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275
demos/gtk-demo/textview.c
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/* Text Widget
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*
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* The GtkTextView widget displays a GtkTextBuffer. One GtkTextBuffer
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* can be displayed by multiple GtkTextViews. This demo has two views
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* displaying a single buffer, and shows off the widget's text
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* formatting features.
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*
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*/
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#include <gtk/gtk.h>
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/* Don't copy this bad example; inline RGB data is always a better
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* idea than inline XPMs.
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*/
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static char * book_open_xpm[] = {
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"16 16 4 1",
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" c None s None",
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". c black",
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"X c #808080",
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"o c white",
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" ",
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" .. ",
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" .Xo. ... ",
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" .Xoo. ..oo. ",
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" .Xooo.Xooo... ",
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" .Xooo.oooo.X. ",
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" .Xooo.Xooo.X. ",
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" .Xooo.oooo.X. ",
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" .Xooo.Xooo.X. ",
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" .Xooo.oooo.X. ",
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" .Xoo.Xoo..X. ",
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" .Xo.o..ooX. ",
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" .X..XXXXX. ",
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" ..X....... ",
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" .. ",
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" "};
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#define gray50_width 2
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#define gray50_height 2
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static char gray50_bits[] = {
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0x02, 0x01
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};
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/* FIXME once TextTag is a GObject remove these awful hacks ;-) */
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#define g_object_set gtk_object_set
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#undef G_OBJECT
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#define G_OBJECT(x) ((void*)x)
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static void
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create_tags (GtkTextBuffer *buffer)
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{
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GtkTextTag *tag;
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GdkBitmap *stipple;
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/* Create a bunch of tags. Note that it's also possible to
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* create tags with gtk_text_tag_new() then add them to the
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* tag table for the buffer, gtk_text_buffer_create_tag() is
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* just a convenience function. Also note that you don't have
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* to give tags a name; pass NULL for the name to create an
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* anonymous tag.
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*
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* In any real app, another useful optimization would be to create
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* a GtkTextTagTable in advance, and reuse the same tag table for
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* all the buffers with the same tag set, instead of creating
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* new copies of the same tags for every buffer.
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*
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* Tags are assigned default priorities in order of addition to the
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* tag table. That is, tags created later that affect the same
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* text property as an earlier tag will override the earlier tag.
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* You can modify tag priorities with gtk_text_tag_set_priority().
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*/
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tag = gtk_text_buffer_create_tag (buffer, "italic");
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g_object_set (G_OBJECT (tag), "font", "sans italic", NULL);
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tag = gtk_text_buffer_create_tag (buffer, "bold");
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g_object_set (G_OBJECT (tag), "font", "sans bold", NULL);
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tag = gtk_text_buffer_create_tag (buffer, "big");
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g_object_set (G_OBJECT (tag), "font", "sans 120", NULL);
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tag = gtk_text_buffer_create_tag (buffer, "blue_foreground");
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g_object_set (G_OBJECT (tag), "foreground", "blue", NULL);
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tag = gtk_text_buffer_create_tag (buffer, "red_background");
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g_object_set (G_OBJECT (tag), "background", "red", NULL);
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stipple = gdk_bitmap_create_from_data (NULL,
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gray50_bits, gray50_width,
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gray50_height);
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tag = gtk_text_buffer_create_tag (buffer, "background_stipple");
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g_object_set (G_OBJECT (tag), "background_stipple", stipple, NULL);
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tag = gtk_text_buffer_create_tag (buffer, "foreground_stipple");
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g_object_set (G_OBJECT (tag), "foreground_stipple", stipple, NULL);
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g_object_unref (G_OBJECT (stipple));
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tag = gtk_text_buffer_create_tag (buffer, "big_gap_before_line");
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g_object_set (G_OBJECT (tag), "pixels_above_lines", 30, NULL);
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tag = gtk_text_buffer_create_tag (buffer, "big_gap_after_line");
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g_object_set (G_OBJECT (tag), "pixels_below_lines", 30, NULL);
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tag = gtk_text_buffer_create_tag (buffer, "double_spaced_line");
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g_object_set (G_OBJECT (tag), "pixels_inside_wrap", 10, NULL);
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tag = gtk_text_buffer_create_tag (buffer, "not_editable");
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g_object_set (G_OBJECT (tag), "editable", FALSE, NULL);
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tag = gtk_text_buffer_create_tag (buffer, "word_wrap");
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g_object_set (G_OBJECT (tag), "wrap_mode", GTK_WRAPMODE_WORD, NULL);
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tag = gtk_text_buffer_create_tag (buffer, "char_wrap");
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g_object_set (G_OBJECT (tag), "wrap_mode", GTK_WRAPMODE_CHAR, NULL);
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tag = gtk_text_buffer_create_tag (buffer, "no_wrap");
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g_object_set (G_OBJECT (tag), "wrap_mode", GTK_WRAPMODE_NONE, NULL);
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tag = gtk_text_buffer_create_tag (buffer, "center");
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g_object_set (G_OBJECT (tag), "justify", GTK_JUSTIFY_CENTER, NULL);
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tag = gtk_text_buffer_create_tag (buffer, "right_justify");
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g_object_set (G_OBJECT (tag), "justify", GTK_JUSTIFY_RIGHT, NULL);
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tag = gtk_text_buffer_create_tag (buffer, "wide_margins");
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g_object_set (G_OBJECT (tag),
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"left_margin", 50, "right_margin", 50,
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NULL);
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tag = gtk_text_buffer_create_tag (buffer, "strikethrough");
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g_object_set (G_OBJECT (tag), "strikethrough", TRUE, NULL);
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tag = gtk_text_buffer_create_tag (buffer, "underline");
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g_object_set (G_OBJECT (tag), "underline", PANGO_UNDERLINE_SINGLE, NULL);
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tag = gtk_text_buffer_create_tag (buffer, "double_underline");
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g_object_set (G_OBJECT (tag), "underline", PANGO_UNDERLINE_DOUBLE, NULL);
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tag = gtk_text_buffer_create_tag (buffer, "superscript");
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g_object_set (G_OBJECT (tag),
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"offset", 10,
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"font", "Sans 8",
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NULL);
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tag = gtk_text_buffer_create_tag (buffer, "subscript");
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g_object_set (G_OBJECT (tag),
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"offset", -10,
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"font", "Sans 8",
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NULL);
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}
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static void
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insert_text (GtkTextBuffer *buffer)
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{
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GtkTextIter iter;
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GtkTextIter start, end;
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/* get start of buffer; each insertion will revalidate the
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* iterator to point to just after the inserted text.
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*/
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gtk_text_buffer_get_iter_at_offset (buffer, &iter, 0);
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gtk_text_buffer_insert (buffer, &iter, "The text widget can display text with all kinds of nifty attributes.\n", -1);
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gtk_text_buffer_insert (buffer, &iter, "For example, you can have ", -1);
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gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
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"italic", -1,
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"italic", NULL);
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gtk_text_buffer_insert (buffer, &iter, ", ", -1);
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gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
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"bold", -1,
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"bold", NULL);
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gtk_text_buffer_insert (buffer, &iter, ", or ", -1);
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gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
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"huge", -1,
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"big", NULL);
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gtk_text_buffer_insert (buffer, &iter, " text. ", -1);
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gtk_text_buffer_insert (buffer, &iter, "Also, colors such as ", -1);
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gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
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"a blue foreground", -1,
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"blue_foreground", NULL);
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gtk_text_buffer_insert (buffer, &iter, " or ", -1);
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gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
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"a red background", -1,
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"red_background", NULL);
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gtk_text_buffer_insert (buffer, &iter, " or even ", -1);
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gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
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"a stippled red background", -1,
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"red_background",
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"background_stipple",
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NULL);
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gtk_text_buffer_insert (buffer, &iter, " or ", -1);
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gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
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"a stippled blue foreground on solid red background", -1,
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"blue_foreground",
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"red_background",
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"foreground_stipple",
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NULL);
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gtk_text_buffer_insert (buffer, &iter, " can be used.\n", -1);
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gtk_text_buffer_insert (buffer, &iter, "This demo doesn't even demonstrate all the GtkTextBuffer features; it leaves out, for example: invisible/hidden text, tab stops, application-drawn areas on the sides of the widget for displaying breakpoints and such...", -1);
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/* Apply word_wrap tag to whole buffer */
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gtk_text_buffer_get_bounds (buffer, &start, &end);
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gtk_text_buffer_apply_tag_by_name (buffer, "word_wrap", &start, &end);
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}
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void
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do_textview (void)
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{
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static GtkWidget *window = NULL;
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if (!window)
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{
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GtkWidget *vpaned;
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GtkWidget *view1;
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GtkWidget *view2;
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GtkWidget *frame;
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GtkTextBuffer *buffer;
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_signal_connect (GTK_OBJECT (window), "destroy",
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GTK_SIGNAL_FUNC(gtk_widget_destroyed),
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&window);
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gtk_window_set_title (GTK_WINDOW (window), "TextView");
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gtk_container_set_border_width (GTK_CONTAINER (window), 0);
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vpaned = gtk_vpaned_new ();
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gtk_container_set_border_width (GTK_CONTAINER(vpaned), 5);
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gtk_container_add (GTK_CONTAINER (window), vpaned);
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/* For convenience, we just use the autocreated buffer from
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* the first text view; you could also create the buffer
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* by itself with gtk_text_buffer_new(), then later create
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* a view widget.
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*/
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view1 = gtk_text_view_new ();
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buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view1));
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view2 = gtk_text_view_new_with_buffer (buffer);
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frame = gtk_frame_new (NULL);
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gtk_frame_set_shadow_type (GTK_FRAME(frame), GTK_SHADOW_IN);
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gtk_widget_set_usize (frame, 300, 200);
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gtk_paned_add1 (GTK_PANED (vpaned), frame);
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gtk_container_add (GTK_CONTAINER (frame), view1);
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frame = gtk_frame_new (NULL);
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gtk_frame_set_shadow_type (GTK_FRAME(frame), GTK_SHADOW_IN);
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gtk_widget_set_usize (frame, 300, 200);
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gtk_paned_add2 (GTK_PANED (vpaned), frame);
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gtk_container_add (GTK_CONTAINER (frame), view2);
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create_tags (buffer);
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insert_text (buffer);
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gtk_widget_show_all (vpaned);
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}
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if (!GTK_WIDGET_VISIBLE (window))
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gtk_widget_show (window);
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else
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gtk_widget_destroy (window);
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}
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