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gtk-demo: Beef up the hypertext demo

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Its almost a dictionary.
This commit is contained in:
Matthias Clasen 2020-09-16 22:31:34 -04:00
parent 7082624fd7
commit 18e46bd6f8
1 changed files with 117 additions and 22 deletions
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139
demos/gtk-demo/hypertext.c
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@ -5,6 +5,9 @@
* bold or colored or underlined. But tags are not restricted to appearance.
* They can also affect the behavior of mouse and key presses, as this demo
* shows.
*
* We also demonstrate adding other things to a text view, such as
* clickable icons.
*/
#include <gtk/gtk.h>
@ -31,35 +34,103 @@ insert_link (GtkTextBuffer *buffer,
gtk_text_buffer_insert_with_tags (buffer, iter, text, -1, tag, NULL);
}
/* Quick-and-dirty text-to-speech for a single word. If you don't hear
* anything, you are missing espeak-ng on your system.
*/
static void
say_word (GtkGestureClick *gesture,
guint n_press,
double x,
double y,
const char *word)
{
const char *argv[3];
argv[0] = "espeak-ng";
argv[1] = word;
argv[2] = NULL;
g_spawn_async (NULL, (char **)argv, NULL, G_SPAWN_SEARCH_PATH, NULL, NULL, NULL, NULL);
}
/* Fills the buffer with text and interspersed links. In any real
* hypertext app, this method would parse a file to identify the links.
*/
static void
show_page (GtkTextBuffer *buffer,
int page)
show_page (GtkTextView *text_view,
int page)
{
GtkTextBuffer *buffer;
GtkTextIter iter;
GtkWidget *child;
GtkTextChildAnchor *anchor;
GtkEventController *controller;
buffer = gtk_text_view_get_buffer (text_view);
gtk_text_buffer_set_text (buffer, "", 0);
gtk_text_buffer_get_iter_at_offset (buffer, &iter, 0);
gtk_text_buffer_begin_irreversible_action (buffer);
if (page == 1)
{
GtkIconPaintable *icon;
GtkIconTheme *theme;
gtk_text_buffer_insert (buffer, &iter, "Some text to show that simple ", -1);
insert_link (buffer, &iter, "hyper text", 3);
insert_link (buffer, &iter, "hypertext", 3);
gtk_text_buffer_insert (buffer, &iter, " can easily be realized with ", -1);
insert_link (buffer, &iter, "tags", 2);
gtk_text_buffer_insert (buffer, &iter, ".\n", -1);
gtk_text_buffer_insert (buffer, &iter,
"Of course you can also embed Emoji 😋, "
"icons ", -1);
theme = gtk_icon_theme_get_for_display (gtk_widget_get_display (GTK_WIDGET (text_view)));
icon = gtk_icon_theme_lookup_icon (theme,
"microphone-sensitivity-high-symbolic",
NULL,
16,
1,
GTK_TEXT_DIR_LTR,
0);
gtk_text_buffer_insert_paintable (buffer, &iter, GDK_PAINTABLE (icon));
g_object_unref (icon);
gtk_text_buffer_insert (buffer, &iter, ", or even widgets ", -1);
anchor = gtk_text_buffer_create_child_anchor (buffer, &iter);
child = gtk_level_bar_new_for_interval (0, 100);
gtk_level_bar_set_value (GTK_LEVEL_BAR (child), 50);
gtk_widget_set_size_request (child, 100, -1);
gtk_text_view_add_child_at_anchor (text_view, child, anchor);
gtk_text_buffer_insert (buffer, &iter, ".", -1);
}
else if (page == 2)
{
gtk_text_buffer_insert (buffer, &iter,
"A tag is an attribute that can be applied to some range of text. "
"For example, a tag might be called \"bold\" and make the text inside "
"the tag bold. However, the tag concept is more general than that; "
"tags don't have to affect appearance. They can instead affect the "
"behavior of mouse and key presses, \"lock\" a range of text so the "
"user can't edit it, or countless other things.\n", -1);
GtkTextTag *tag;
tag = gtk_text_buffer_create_tag (buffer, NULL,
"weight", PANGO_WEIGHT_BOLD,
"scale", PANGO_SCALE_X_LARGE,
NULL);
gtk_text_buffer_insert_with_tags (buffer, &iter, "tag", -1, tag, NULL);
tag = gtk_text_buffer_create_tag (buffer, NULL,
"family", "monospace",
NULL);
gtk_text_buffer_insert_with_tags (buffer, &iter, " / tag / ", -1, tag, NULL);
anchor = gtk_text_buffer_create_child_anchor (buffer, &iter);
child = gtk_image_new_from_icon_name ("audio-volume-high-symbolic");
gtk_widget_set_cursor_from_name (child, "pointer");
controller = GTK_EVENT_CONTROLLER (gtk_gesture_click_new ());
g_signal_connect (controller, "pressed", G_CALLBACK (say_word), (gpointer)"tag");
gtk_widget_add_controller (child, controller);
gtk_text_view_add_child_at_anchor (text_view, child, anchor);
gtk_text_buffer_insert (buffer, &iter, "\n"
"An attribute that can be applied to some range of text. For example, "
"a tag might be called “bold” and make the text inside the tag bold.\n"
"However, the tag concept is more general than that; "
"tags don't have to affect appearance. They can instead affect the "
"behavior of mouse and key presses, “lock” a range of text so the "
"user can't edit it, or countless other things.\n", -1);
insert_link (buffer, &iter, "Go back", 1);
}
else if (page == 3)
@ -68,11 +139,25 @@ show_page (GtkTextBuffer *buffer,
tag = gtk_text_buffer_create_tag (buffer, NULL,
"weight", PANGO_WEIGHT_BOLD,
"scale", PANGO_SCALE_X_LARGE,
NULL);
gtk_text_buffer_insert_with_tags (buffer, &iter, "hypertext:\n", -1, tag, NULL);
gtk_text_buffer_insert (buffer, &iter,
"machine-readable text that is not sequential but is organized "
"so that related items of information are connected.\n", -1);
gtk_text_buffer_insert_with_tags (buffer, &iter, "hypertext", -1, tag, NULL);
tag = gtk_text_buffer_create_tag (buffer, NULL,
"family", "monospace",
NULL);
gtk_text_buffer_insert_with_tags (buffer, &iter, " / ˈhaɪ pərˌtɛkst / ", -1, tag, NULL);
anchor = gtk_text_buffer_create_child_anchor (buffer, &iter);
child = gtk_image_new_from_icon_name ("audio-volume-high-symbolic");
gtk_widget_set_cursor_from_name (child, "pointer");
controller = GTK_EVENT_CONTROLLER (gtk_gesture_click_new ());
g_signal_connect (controller, "pressed", G_CALLBACK (say_word), (gpointer)"hypertext");
gtk_widget_add_controller (child, controller);
gtk_text_view_add_child_at_anchor (text_view, child, anchor);
gtk_text_buffer_insert (buffer, &iter, "\n"
"Machine-readable text that is not sequential but is organized "
"so that related items of information are connected.\n", -1);
insert_link (buffer, &iter, "Go back", 1);
}
gtk_text_buffer_end_irreversible_action (buffer);
@ -96,7 +181,7 @@ follow_if_link (GtkWidget *text_view,
if (page != 0)
{
show_page (gtk_text_view_get_buffer (GTK_TEXT_VIEW (text_view)), page);
show_page (GTK_TEXT_VIEW (text_view), page);
break;
}
}
@ -163,7 +248,7 @@ released_cb (GtkGestureClick *gesture,
if (gtk_text_iter_get_offset (&start) != gtk_text_iter_get_offset (&end))
return;
if (gtk_text_view_get_iter_at_location (GTK_TEXT_VIEW (text_view), &iter, x, y))
if (gtk_text_view_get_iter_at_location (GTK_TEXT_VIEW (text_view), &iter, tx, ty))
follow_if_link (text_view, &iter);
}
@ -173,7 +258,13 @@ motion_cb (GtkEventControllerMotion *controller,
double y,
GtkTextView *text_view)
{
set_cursor_if_appropriate (text_view, x, y);
int tx, ty;
gtk_text_view_window_to_buffer_coords (text_view,
GTK_TEXT_WINDOW_WIDGET,
x, y, &tx, &ty);
set_cursor_if_appropriate (text_view, tx, ty);
}
static gboolean hovering_over_link = FALSE;
@ -183,9 +274,9 @@ static gboolean hovering_over_link = FALSE;
* typically used by web browsers.
*/
static void
set_cursor_if_appropriate (GtkTextView *text_view,
int x,
int y)
set_cursor_if_appropriate (GtkTextView *text_view,
int x,
int y)
{
GSList *tags = NULL, *tagp = NULL;
GtkTextIter iter;
@ -237,13 +328,17 @@ do_hypertext (GtkWidget *do_widget)
gtk_window_set_title (GTK_WINDOW (window), "Hypertext");
gtk_window_set_display (GTK_WINDOW (window),
gtk_widget_get_display (do_widget));
gtk_window_set_default_size (GTK_WINDOW (window), 450, 450);
gtk_window_set_default_size (GTK_WINDOW (window), 330, 330);
gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
view = gtk_text_view_new ();
gtk_text_view_set_wrap_mode (GTK_TEXT_VIEW (view), GTK_WRAP_WORD);
gtk_text_view_set_top_margin (GTK_TEXT_VIEW (view), 20);
gtk_text_view_set_bottom_margin (GTK_TEXT_VIEW (view), 20);
gtk_text_view_set_left_margin (GTK_TEXT_VIEW (view), 20);
gtk_text_view_set_right_margin (GTK_TEXT_VIEW (view), 20);
gtk_text_view_set_pixels_below_lines (GTK_TEXT_VIEW (view), 10);
controller = gtk_event_controller_key_new ();
g_signal_connect (controller, "key-pressed", G_CALLBACK (key_pressed), view);
gtk_widget_add_controller (view, controller);
@ -268,7 +363,7 @@ do_hypertext (GtkWidget *do_widget)
gtk_window_set_child (GTK_WINDOW (window), sw);
gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), view);
show_page (buffer, 1);
show_page (GTK_TEXT_VIEW (view), 1);
}
if (!gtk_widget_get_visible (window))