#include "config.h" #include typedef struct { GtkTextView parent; } MyTextView; typedef struct { GtkTextViewClass parent_class; } MyTextViewClass; G_DEFINE_TYPE (MyTextView, my_text_view, GTK_TYPE_TEXT_VIEW); static void snapshot_background (GtkWidget *widget, GtkSnapshot *snapshot); static void my_text_view_init (MyTextView *text_view) { } static void my_text_view_snapshot_layer (GtkTextView *textview, GtkTextViewLayer layer, GtkSnapshot *snapshot) { if (layer == GTK_TEXT_VIEW_LAYER_BELOW_TEXT) snapshot_background (GTK_WIDGET (textview), snapshot); } static void my_text_view_class_init (MyTextViewClass *klass) { GTK_TEXT_VIEW_CLASS (klass)->snapshot_layer = my_text_view_snapshot_layer; } static void create_tags (GtkTextBuffer *buffer) { 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, "x-large", "scale", PANGO_SCALE_X_LARGE, NULL); gtk_text_buffer_create_tag (buffer, "semi_blue_foreground", "foreground", "rgba(0,0,255,0.7)", NULL); gtk_text_buffer_create_tag (buffer, "semi_red_background", "background", "rgba(255,0,0,0.5)", NULL); gtk_text_buffer_create_tag (buffer, "semi_orange_paragraph_background", "paragraph-background", "rgba(255,165,0,0.5)", NULL); gtk_text_buffer_create_tag (buffer, "word_wrap", "wrap_mode", GTK_WRAP_WORD, NULL); } static GtkTextChildAnchor * insert_text (GtkTextBuffer *buffer) { GtkTextIter iter; GtkTextIter start, end; GtkTextMark *para_start; GtkTextChildAnchor *anchor; /* 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, "This test shows text view rendering some text with rgba colors.\n\n", -1); gtk_text_buffer_insert (buffer, &iter, "For example, you can have ", -1); gtk_text_buffer_insert_with_tags_by_name (buffer, &iter, "italic translucent blue text", -1, "italic", "semi_blue_foreground", "x-large", NULL); gtk_text_buffer_insert (buffer, &iter, ", or ", -1); gtk_text_buffer_insert (buffer, &iter, ", ", -1); gtk_text_buffer_insert_with_tags_by_name (buffer, &iter, "bold text with translucent red background", -1, "bold", "semi_red_background", "x-large", NULL); gtk_text_buffer_insert (buffer, &iter, ".\n\n", -1); anchor = gtk_text_buffer_create_child_anchor (buffer, &iter); /* Store the beginning of the other paragraph */ para_start = gtk_text_buffer_create_mark (buffer, "para_start", &iter, TRUE); gtk_text_buffer_insert (buffer, &iter, "Paragraph background colors can also be set with rgba color values .\n", -1); gtk_text_buffer_insert (buffer, &iter, "For instance, you can have ", -1); gtk_text_buffer_insert_with_tags_by_name (buffer, &iter, "bold translucent blue text", -1, "bold", "semi_blue_foreground", "x-large", NULL); gtk_text_buffer_insert (buffer, &iter, ", or ", -1); gtk_text_buffer_insert (buffer, &iter, ", ", -1); gtk_text_buffer_insert_with_tags_by_name (buffer, &iter, "italic text with translucent red background", -1, "italic", "semi_red_background", "x-large", NULL); gtk_text_buffer_insert (buffer, &iter, " all rendered onto a translucent orange paragraph background.\n", -1); gtk_text_buffer_get_bounds (buffer, &start, &end); gtk_text_buffer_get_iter_at_mark (buffer, &iter, para_start); gtk_text_buffer_apply_tag_by_name (buffer, "semi_orange_paragraph_background", &iter, &end); /* Apply word_wrap tag to whole buffer */ gtk_text_buffer_get_bounds (buffer, &start, &end); gtk_text_buffer_apply_tag_by_name (buffer, "word_wrap", &start, &end); return anchor; } /* Size of checks and gray levels for alpha compositing checkerboard */ #define CHECK_SIZE 10 #define CHECK_DARK (1.0 / 3.0) #define CHECK_LIGHT (2.0 / 3.0) static void snapshot_background (GtkWidget *widget, GtkSnapshot *snapshot) { GdkRectangle visible_rect; gtk_text_view_get_visible_rect (GTK_TEXT_VIEW (widget), &visible_rect); gtk_snapshot_append_color (snapshot, &(GdkRGBA) { CHECK_DARK, CHECK_DARK, CHECK_DARK, 1.0 }, &GRAPHENE_RECT_INIT(visible_rect.x, visible_rect.y, visible_rect.width, visible_rect.height)); gtk_snapshot_push_repeat (snapshot, &GRAPHENE_RECT_INIT(visible_rect.x, visible_rect.y, visible_rect.width, visible_rect.height), &GRAPHENE_RECT_INIT(visible_rect.x, visible_rect.y, CHECK_SIZE * 2, CHECK_SIZE * 2)); gtk_snapshot_append_color (snapshot, &(GdkRGBA) { CHECK_LIGHT, CHECK_LIGHT, CHECK_LIGHT, 1.0 }, &GRAPHENE_RECT_INIT(visible_rect.x, visible_rect.y, CHECK_SIZE, CHECK_SIZE)); gtk_snapshot_append_color (snapshot, &(GdkRGBA) { CHECK_LIGHT, CHECK_LIGHT, CHECK_LIGHT, 1.0 }, &GRAPHENE_RECT_INIT(visible_rect.x + CHECK_SIZE, visible_rect.y + CHECK_SIZE, CHECK_SIZE, CHECK_SIZE)); gtk_snapshot_pop (snapshot); } int main (int argc, char **argv) { GtkWidget *window, *textview, *sw, *button, *button2; GtkTextBuffer *buffer; GtkTextChildAnchor *anchor; gtk_init (); window = gtk_window_new (); sw = gtk_scrolled_window_new (NULL, NULL); textview = g_object_new (my_text_view_get_type (), NULL); buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (textview)); button = gtk_button_new_with_label ("Fixed Child"); button2 = gtk_button_new_with_label ("Flowed Child"); gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC); gtk_window_set_default_size (GTK_WINDOW (window), 400, 400); create_tags (buffer); anchor = insert_text (buffer); gtk_container_add (GTK_CONTAINER (window), sw); gtk_container_add (GTK_CONTAINER (sw), textview); gtk_text_view_add_overlay (GTK_TEXT_VIEW (textview), button, 50, 150); gtk_text_view_add_child_at_anchor (GTK_TEXT_VIEW (textview), button2, anchor); gtk_widget_show (window); while (TRUE) g_main_context_iteration (NULL, TRUE); return 0; }