#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 draw_background (GtkWidget *widget, cairo_t *cr); static void my_text_view_init (MyTextView *text_view) { } static void my_text_view_draw_layer (GtkTextView *textview, GtkTextViewLayer layer, cairo_t *cr) { if (layer == GTK_TEXT_VIEW_LAYER_BELOW) draw_background (GTK_WIDGET (textview), cr); } static void my_text_view_class_init (MyTextViewClass *klass) { GTK_TEXT_VIEW_CLASS (klass)->draw_layer = my_text_view_draw_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 cairo_pattern_t * get_checkered (void) { /* need to respect pixman's stride being a multiple of 4 */ static unsigned char data[8] = { 0xFF, 0x00, 0x00, 0x00, 0x00, 0xFF, 0x00, 0x00 }; static cairo_surface_t *checkered = NULL; cairo_pattern_t *pattern; if (checkered == NULL) { checkered = cairo_image_surface_create_for_data (data, CAIRO_FORMAT_A8, 2, 2, 4); } pattern = cairo_pattern_create_for_surface (checkered); cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT); cairo_pattern_set_filter (pattern, CAIRO_FILTER_NEAREST); return pattern; } static void draw_background (GtkWidget *widget, cairo_t *cr) { GdkRectangle visible_rect; cairo_pattern_t *pat; cairo_save (cr); gtk_text_view_get_visible_rect (GTK_TEXT_VIEW (widget), &visible_rect); cairo_translate (cr, -visible_rect.x, -visible_rect.y); cairo_set_source_rgb (cr, CHECK_DARK, CHECK_DARK, CHECK_DARK); cairo_paint (cr); cairo_set_source_rgb (cr, CHECK_LIGHT, CHECK_LIGHT, CHECK_LIGHT); cairo_scale (cr, CHECK_SIZE, CHECK_SIZE); pat = get_checkered (); cairo_mask (cr, pat); cairo_pattern_destroy (pat); cairo_restore (cr); } int main (int argc, char **argv) { GtkWidget *window, *textview, *sw, *button, *button2; GtkTextBuffer *buffer; GtkTextChildAnchor *anchor; gtk_init (); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); 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_widget_show (button); gtk_widget_show (button2); gtk_widget_show (textview); gtk_widget_show (sw); gtk_container_add (GTK_CONTAINER (window), sw); gtk_container_add (GTK_CONTAINER (sw), textview); gtk_text_view_add_child_in_window (GTK_TEXT_VIEW (textview), button, GTK_TEXT_WINDOW_TEXT, 50, 150); gtk_text_view_add_child_at_anchor (GTK_TEXT_VIEW (textview), button2, anchor); gtk_widget_show (window); gtk_main (); return 0; }