238 lines
7.2 KiB
C
238 lines
7.2 KiB
C
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#include "config.h"
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#include <gtk/gtk.h>
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typedef struct {
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GtkTextView parent;
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} MyTextView;
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typedef struct {
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GtkTextViewClass parent_class;
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} MyTextViewClass;
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G_DEFINE_TYPE (MyTextView, my_text_view, GTK_TYPE_TEXT_VIEW);
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static void draw_background (GtkWidget *widget, cairo_t *cr);
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static void
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my_text_view_init (MyTextView *text_view)
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{
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}
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static void my_text_view_draw_layer (GtkTextView *textview,
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GtkTextViewLayer layer,
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cairo_t *cr)
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{
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if (layer == GTK_TEXT_VIEW_LAYER_BELOW)
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draw_background (GTK_WIDGET (textview), cr);
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}
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static void
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my_text_view_class_init (MyTextViewClass *klass)
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{
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GTK_TEXT_VIEW_CLASS (klass)->draw_layer = my_text_view_draw_layer;
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}
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static void
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create_tags (GtkTextBuffer *buffer)
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{
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gtk_text_buffer_create_tag (buffer, "italic",
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"style", PANGO_STYLE_ITALIC, NULL);
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gtk_text_buffer_create_tag (buffer, "bold",
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"weight", PANGO_WEIGHT_BOLD, NULL);
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gtk_text_buffer_create_tag (buffer, "x-large",
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"scale", PANGO_SCALE_X_LARGE, NULL);
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gtk_text_buffer_create_tag (buffer, "semi_blue_foreground",
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"foreground", "rgba(0,0,255,0.7)", NULL);
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gtk_text_buffer_create_tag (buffer, "semi_red_background",
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"background", "rgba(255,0,0,0.5)", NULL);
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gtk_text_buffer_create_tag (buffer, "semi_orange_paragraph_background",
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"paragraph-background", "rgba(255,165,0,0.5)", NULL);
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gtk_text_buffer_create_tag (buffer, "word_wrap",
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"wrap_mode", GTK_WRAP_WORD, NULL);
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}
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static GtkTextChildAnchor *
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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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GtkTextMark *para_start;
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GtkTextChildAnchor *anchor;
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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,
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"This test shows text view rendering some text with rgba colors.\n\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 translucent blue text", -1,
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"italic",
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"semi_blue_foreground",
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"x-large",
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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 (buffer, &iter, ", ", -1);
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gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
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"bold text with translucent red background", -1,
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"bold",
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"semi_red_background",
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"x-large",
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NULL);
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gtk_text_buffer_insert (buffer, &iter, ".\n\n", -1);
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anchor = gtk_text_buffer_create_child_anchor (buffer, &iter);
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/* Store the beginning of the other paragraph */
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para_start = gtk_text_buffer_create_mark (buffer, "para_start", &iter, TRUE);
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gtk_text_buffer_insert (buffer, &iter,
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"Paragraph background colors can also be set with rgba color values .\n", -1);
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gtk_text_buffer_insert (buffer, &iter, "For instance, you can have ", -1);
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gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
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"bold translucent blue text", -1,
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"bold",
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"semi_blue_foreground",
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"x-large",
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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 (buffer, &iter, ", ", -1);
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gtk_text_buffer_insert_with_tags_by_name (buffer, &iter,
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"italic text with translucent red background", -1,
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"italic",
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"semi_red_background",
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"x-large",
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NULL);
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gtk_text_buffer_insert (buffer, &iter, " all rendered onto a translucent orange paragraph background.\n", -1);
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gtk_text_buffer_get_bounds (buffer, &start, &end);
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gtk_text_buffer_get_iter_at_mark (buffer, &iter, para_start);
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gtk_text_buffer_apply_tag_by_name (buffer, "semi_orange_paragraph_background", &iter, &end);
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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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return anchor;
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}
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/* Size of checks and gray levels for alpha compositing checkerboard */
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#define CHECK_SIZE 10
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#define CHECK_DARK (1.0 / 3.0)
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#define CHECK_LIGHT (2.0 / 3.0)
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static cairo_pattern_t *
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get_checkered (void)
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{
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/* need to respect pixman's stride being a multiple of 4 */
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static unsigned char data[8] = { 0xFF, 0x00, 0x00, 0x00,
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0x00, 0xFF, 0x00, 0x00 };
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static cairo_surface_t *checkered = NULL;
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cairo_pattern_t *pattern;
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if (checkered == NULL)
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{
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checkered = cairo_image_surface_create_for_data (data,
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CAIRO_FORMAT_A8,
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2, 2, 4);
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}
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pattern = cairo_pattern_create_for_surface (checkered);
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cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
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cairo_pattern_set_filter (pattern, CAIRO_FILTER_NEAREST);
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return pattern;
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}
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static void
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draw_background (GtkWidget *widget, cairo_t *cr)
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{
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GdkRectangle visible_rect;
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cairo_pattern_t *pat;
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cairo_save (cr);
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gtk_text_view_get_visible_rect (GTK_TEXT_VIEW (widget), &visible_rect);
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cairo_translate (cr, -visible_rect.x, -visible_rect.y);
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cairo_set_source_rgb (cr, CHECK_DARK, CHECK_DARK, CHECK_DARK);
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cairo_paint (cr);
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cairo_set_source_rgb (cr, CHECK_LIGHT, CHECK_LIGHT, CHECK_LIGHT);
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cairo_scale (cr, CHECK_SIZE, CHECK_SIZE);
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pat = get_checkered ();
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cairo_mask (cr, pat);
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cairo_pattern_destroy (pat);
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cairo_restore (cr);
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}
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int
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main (int argc, char **argv)
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{
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GtkWidget *window, *textview, *sw, *button, *button2;
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GtkTextBuffer *buffer;
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GtkTextChildAnchor *anchor;
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gtk_init (&argc, &argv);
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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sw = gtk_scrolled_window_new (NULL, NULL);
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textview = g_object_new (my_text_view_get_type (), NULL);
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buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (textview));
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button = gtk_button_new_with_label ("Fixed Child");
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button2 = gtk_button_new_with_label ("Flowed Child");
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gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
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GTK_POLICY_AUTOMATIC,
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GTK_POLICY_AUTOMATIC);
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gtk_window_set_default_size (GTK_WINDOW (window), 400, 400);
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create_tags (buffer);
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anchor = insert_text (buffer);
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gtk_widget_show (button);
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gtk_widget_show (button2);
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gtk_widget_show (textview);
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gtk_widget_show (sw);
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gtk_container_add (GTK_CONTAINER (window), sw);
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gtk_container_add (GTK_CONTAINER (sw), textview);
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gtk_text_view_add_child_in_window (GTK_TEXT_VIEW (textview),
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button,
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GTK_TEXT_WINDOW_TEXT,
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50, 150);
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gtk_text_view_add_child_at_anchor (GTK_TEXT_VIEW (textview),
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button2, anchor);
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gtk_widget_show (window);
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gtk_main ();
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return 0;
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}
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