diff options
Diffstat (limited to 'gtk+-mingw/share/gtk-3.0/demo/hypertext.c')
| -rw-r--r-- | gtk+-mingw/share/gtk-3.0/demo/hypertext.c | 291 |
1 files changed, 0 insertions, 291 deletions
diff --git a/gtk+-mingw/share/gtk-3.0/demo/hypertext.c b/gtk+-mingw/share/gtk-3.0/demo/hypertext.c deleted file mode 100644 index 534a62d..0000000 --- a/gtk+-mingw/share/gtk-3.0/demo/hypertext.c +++ /dev/null @@ -1,291 +0,0 @@ -/* Text Widget/Hypertext - * - * Usually, tags modify the appearance of text in the view, e.g. making it - * 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. - */ - -#include <gtk/gtk.h> -#include <gdk/gdkkeysyms.h> - -/* Inserts a piece of text into the buffer, giving it the usual - * appearance of a hyperlink in a web browser: blue and underlined. - * Additionally, attaches some data on the tag, to make it recognizable - * as a link. - */ -static void -insert_link (GtkTextBuffer *buffer, - GtkTextIter *iter, - gchar *text, - gint page) -{ - GtkTextTag *tag; - - tag = gtk_text_buffer_create_tag (buffer, NULL, - "foreground", "blue", - "underline", PANGO_UNDERLINE_SINGLE, - NULL); - g_object_set_data (G_OBJECT (tag), "page", GINT_TO_POINTER (page)); - gtk_text_buffer_insert_with_tags (buffer, iter, text, -1, tag, 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, - gint page) -{ - GtkTextIter iter; - - gtk_text_buffer_set_text (buffer, "", 0); - gtk_text_buffer_get_iter_at_offset (buffer, &iter, 0); - if (page == 1) - { - gtk_text_buffer_insert (buffer, &iter, "Some text to show that simple ", -1); - 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, ".", -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); - insert_link (buffer, &iter, "Go back", 1); - } - else if (page == 3) - { - GtkTextTag *tag; - - tag = gtk_text_buffer_create_tag (buffer, NULL, - "weight", PANGO_WEIGHT_BOLD, - 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); - insert_link (buffer, &iter, "Go back", 1); - } -} - -/* Looks at all tags covering the position of iter in the text view, - * and if one of them is a link, follow it by showing the page identified - * by the data attached to it. - */ -static void -follow_if_link (GtkWidget *text_view, - GtkTextIter *iter) -{ - GSList *tags = NULL, *tagp = NULL; - - tags = gtk_text_iter_get_tags (iter); - for (tagp = tags; tagp != NULL; tagp = tagp->next) - { - GtkTextTag *tag = tagp->data; - gint page = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (tag), "page")); - - if (page != 0) - { - show_page (gtk_text_view_get_buffer (GTK_TEXT_VIEW (text_view)), page); - break; - } - } - - if (tags) - g_slist_free (tags); -} - -/* Links can be activated by pressing Enter. - */ -static gboolean -key_press_event (GtkWidget *text_view, - GdkEventKey *event) -{ - GtkTextIter iter; - GtkTextBuffer *buffer; - - switch (event->keyval) - { - case GDK_KEY_Return: - case GDK_KEY_KP_Enter: - buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (text_view)); - gtk_text_buffer_get_iter_at_mark (buffer, &iter, - gtk_text_buffer_get_insert (buffer)); - follow_if_link (text_view, &iter); - break; - - default: - break; - } - - return FALSE; -} - -/* Links can also be activated by clicking. - */ -static gboolean -event_after (GtkWidget *text_view, - GdkEvent *ev) -{ - GtkTextIter start, end, iter; - GtkTextBuffer *buffer; - GdkEventButton *event; - gint x, y; - - if (ev->type != GDK_BUTTON_RELEASE) - return FALSE; - - event = (GdkEventButton *)ev; - - if (event->button != GDK_BUTTON_PRIMARY) - return FALSE; - - buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (text_view)); - - /* we shouldn't follow a link if the user has selected something */ - gtk_text_buffer_get_selection_bounds (buffer, &start, &end); - if (gtk_text_iter_get_offset (&start) != gtk_text_iter_get_offset (&end)) - return FALSE; - - gtk_text_view_window_to_buffer_coords (GTK_TEXT_VIEW (text_view), - GTK_TEXT_WINDOW_WIDGET, - event->x, event->y, &x, &y); - - gtk_text_view_get_iter_at_location (GTK_TEXT_VIEW (text_view), &iter, x, y); - - follow_if_link (text_view, &iter); - - return FALSE; -} - -static gboolean hovering_over_link = FALSE; -static GdkCursor *hand_cursor = NULL; -static GdkCursor *regular_cursor = NULL; - -/* Looks at all tags covering the position (x, y) in the text view, - * and if one of them is a link, change the cursor to the "hands" cursor - * typically used by web browsers. - */ -static void -set_cursor_if_appropriate (GtkTextView *text_view, - gint x, - gint y) -{ - GSList *tags = NULL, *tagp = NULL; - GtkTextIter iter; - gboolean hovering = FALSE; - - gtk_text_view_get_iter_at_location (text_view, &iter, x, y); - - tags = gtk_text_iter_get_tags (&iter); - for (tagp = tags; tagp != NULL; tagp = tagp->next) - { - GtkTextTag *tag = tagp->data; - gint page = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (tag), "page")); - - if (page != 0) - { - hovering = TRUE; - break; - } - } - - if (hovering != hovering_over_link) - { - hovering_over_link = hovering; - - if (hovering_over_link) - gdk_window_set_cursor (gtk_text_view_get_window (text_view, GTK_TEXT_WINDOW_TEXT), hand_cursor); - else - gdk_window_set_cursor (gtk_text_view_get_window (text_view, GTK_TEXT_WINDOW_TEXT), regular_cursor); - } - - if (tags) - g_slist_free (tags); -} - -/* Update the cursor image if the pointer moved. - */ -static gboolean -motion_notify_event (GtkWidget *text_view, - GdkEventMotion *event) -{ - gint x, y; - - gtk_text_view_window_to_buffer_coords (GTK_TEXT_VIEW (text_view), - GTK_TEXT_WINDOW_WIDGET, - event->x, event->y, &x, &y); - - set_cursor_if_appropriate (GTK_TEXT_VIEW (text_view), x, y); - - return FALSE; -} - -GtkWidget * -do_hypertext (GtkWidget *do_widget) -{ - static GtkWidget *window = NULL; - - if (!window) - { - GtkWidget *view; - GtkWidget *sw; - GtkTextBuffer *buffer; - - hand_cursor = gdk_cursor_new (GDK_HAND2); - regular_cursor = gdk_cursor_new (GDK_XTERM); - - window = gtk_window_new (GTK_WINDOW_TOPLEVEL); - gtk_window_set_screen (GTK_WINDOW (window), - gtk_widget_get_screen (do_widget)); - gtk_window_set_default_size (GTK_WINDOW (window), - 450, 450); - - g_signal_connect (window, "destroy", - G_CALLBACK (gtk_widget_destroyed), &window); - - gtk_window_set_title (GTK_WINDOW (window), "Hypertext"); - gtk_container_set_border_width (GTK_CONTAINER (window), 0); - - view = gtk_text_view_new (); - gtk_text_view_set_wrap_mode (GTK_TEXT_VIEW (view), GTK_WRAP_WORD); - g_signal_connect (view, "key-press-event", - G_CALLBACK (key_press_event), NULL); - g_signal_connect (view, "event-after", - G_CALLBACK (event_after), NULL); - g_signal_connect (view, "motion-notify-event", - G_CALLBACK (motion_notify_event), NULL); - - buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view)); - - sw = gtk_scrolled_window_new (NULL, NULL); - gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw), - GTK_POLICY_AUTOMATIC, - GTK_POLICY_AUTOMATIC); - gtk_container_add (GTK_CONTAINER (window), sw); - gtk_container_add (GTK_CONTAINER (sw), view); - - show_page (buffer, 1); - - gtk_widget_show_all (sw); - } - - if (!gtk_widget_get_visible (window)) - { - gtk_widget_show (window); - } - else - { - gtk_widget_destroy (window); - window = NULL; - } - - return window; -} |