forked from AuroraMiddleware/gtk
fea2a82ef6
This creates a new GtkTextViewChild that can manage overlay children at given x,y offsets in buffer coordinates. This simplifies GtkTextView by extracting this from GtkTextWindow as well as providing a real widget for the borders. With this change, we also rename gtk_text_view_add_child_in_window() to gtk_text_view_add_overlay(). For those that were using GTK_TEXT_WINDOW_WIDGET, they can use a GtkOverlay. It does not appear that anyone was using GTK_TEXT_WINDOW_(LEFT|RIGHT|TOP|BOTTOM) for widgets in this fashion, but that can be done by setting a gutter widget with gtk_text_view_set_gutter(). We can make GtkTextViewChild public if necessary to simplify this should it become necessary. GtkTextViewChild will setup a CSS node of either "text" or "border" depending on the GtkTextWindowType. The old GtkTextViewChild has been renamed to AnchoredChild as it is only used for widgets with anchors in the GtkTextBuffer. This also removes the use of allocated GSList and instead embeds a GQueue and GList to save a few extraneous allocations.
209 lines
7.1 KiB
C
209 lines
7.1 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 snapshot_background (GtkWidget *widget, GtkSnapshot *snapshot);
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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_snapshot_layer (GtkTextView *textview,
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GtkTextViewLayer layer,
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GtkSnapshot *snapshot)
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{
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if (layer == GTK_TEXT_VIEW_LAYER_BELOW_TEXT)
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snapshot_background (GTK_WIDGET (textview), snapshot);
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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)->snapshot_layer = my_text_view_snapshot_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 void
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snapshot_background (GtkWidget *widget,
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GtkSnapshot *snapshot)
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{
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GdkRectangle visible_rect;
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gtk_text_view_get_visible_rect (GTK_TEXT_VIEW (widget), &visible_rect);
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gtk_snapshot_append_color (snapshot,
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&(GdkRGBA) { CHECK_DARK, CHECK_DARK, CHECK_DARK, 1.0 },
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&GRAPHENE_RECT_INIT(visible_rect.x, visible_rect.y, visible_rect.width, visible_rect.height));
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gtk_snapshot_push_repeat (snapshot,
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&GRAPHENE_RECT_INIT(visible_rect.x, visible_rect.y, visible_rect.width, visible_rect.height),
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&GRAPHENE_RECT_INIT(visible_rect.x, visible_rect.y, CHECK_SIZE * 2, CHECK_SIZE * 2));
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gtk_snapshot_append_color (snapshot,
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&(GdkRGBA) { CHECK_LIGHT, CHECK_LIGHT, CHECK_LIGHT, 1.0 },
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&GRAPHENE_RECT_INIT(visible_rect.x, visible_rect.y, CHECK_SIZE, CHECK_SIZE));
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gtk_snapshot_append_color (snapshot,
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&(GdkRGBA) { CHECK_LIGHT, CHECK_LIGHT, CHECK_LIGHT, 1.0 },
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&GRAPHENE_RECT_INIT(visible_rect.x + CHECK_SIZE, visible_rect.y + CHECK_SIZE, CHECK_SIZE, CHECK_SIZE));
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gtk_snapshot_pop (snapshot);
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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 ();
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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_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_overlay (GTK_TEXT_VIEW (textview),
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button,
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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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