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Hello List, I want to draw on top of a gtktreeview. This is what I came up with. Looking for some expert advice on how I can improve it. thanks, Vik. /* gcc -g -Wall `pkg-config gtk+-2.0 --cflags --libs` hello.c -o hello */ #include <gtk/gtk.h> #include <cairo.h> gboolean paint(GtkTreeView *widget, GdkEventExpose *event, gpointer udata){ cairo_t *cr; cr = gdk_cairo_create (gtk_tree_view_get_bin_window(widget)); cairo_select_font_face (cr,"Sans",CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD); cairo_set_font_size (cr, 72); cairo_move_to (cr, 50, 150); cairo_set_source_rgba (cr, 0.3,0.3,0.3,0.5); cairo_set_operator(cr,CAIRO_OPERATOR_MULTIPLY); cairo_show_text (cr, "Hello World"); cairo_destroy (cr); return FALSE; } int main (int argc, char **argv){ gtk_init(&argc,&argv); GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL); g_signal_connect (G_OBJECT (window), "delete-event", G_CALLBACK(gtk_main_quit), NULL); gpointer swindow = gtk_scrolled_window_new(NULL,NULL); GtkAdjustment *vadj = gtk_scrolled_window_get_vadjustment(swindow); gpointer list = gtk_list_store_new(1,G_TYPE_STRING); gpointer view = gtk_tree_view_new_with_model(list); g_signal_connect_swapped(vadj,"value-changed", G_CALLBACK(gtk_widget_queue_draw),view); gtk_tree_view_insert_column_with_attributes(view,0,"strings", gtk_cell_renderer_text_new(),"text",0,NULL); int i; GtkTreeIter iter; for(i=0;i<200;i++){ gtk_list_store_insert_before(list,&iter,NULL); gtk_list_store_set(list,&iter,0,"This is a really cool line of text ok",-1); } gtk_widget_set_size_request (view,640,480); g_signal_connect_after(view, "expose-event",G_CALLBACK(paint),NULL); gtk_container_add (GTK_CONTAINER (swindow), view); gtk_container_add (GTK_CONTAINER (window), swindow); gtk_widget_show_all (window); gtk_main (); return 0; } |
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