Created
March 31, 2012 17:30
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Draw arrow at cursor position in TextView in GTK3
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| #!/usr/bin/env python2 | |
| from gi.repository import Gtk | |
| ARROW_DISTANCE = 5 | |
| ARROW_LENGTH = 250 | |
| ARROW_TRIANGLE_LENGTH = 100 | |
| ARROW_TRIANGLE_WIDTH = 30 | |
| def get_cursor_coordinates(self): | |
| text_buffer = self.get_buffer() | |
| text_mark = text_buffer.get_insert() | |
| text_iter = text_buffer.get_iter_at_mark(text_mark) | |
| l = self.get_iter_location(text_iter) | |
| coords = self.buffer_to_window_coords(Gtk.TextWindowType.WIDGET, 0, 0) | |
| return l.x + coords[0], l.y + coords[1], l.width, l.height | |
| # don't know how pythonic this is but it sure is useful | |
| Gtk.TextView.get_cursor_coordinates = get_cursor_coordinates | |
| class MyWindow(Gtk.Window): | |
| def __init__(self): | |
| Gtk.Window.__init__(self, title='Text test') | |
| self.set_default_size(500, 250) | |
| vbox = Gtk.Box(False, orientation=Gtk.Orientation.VERTICAL) | |
| self.add(vbox) | |
| scrolled_text_view = Gtk.ScrolledWindow() | |
| text_view = Gtk.TextView() | |
| vbox.pack_start(scrolled_text_view, True, True, 0) | |
| scrolled_text_view.add(text_view) | |
| text_view.connect('draw', self.on_draw_text_view) | |
| text_view.connect('move-cursor', self.on_update_cursor) | |
| text_view.get_buffer().connect('changed', self.on_update_cursor) | |
| self.text_view = text_view | |
| def on_update_cursor(self, *args): | |
| # w/o this there are artifacts remaining if arrow is too large | |
| self.text_view.queue_draw() | |
| def on_draw_text_view(self, text_view, ctxt): | |
| x, y, w, h = text_view.get_cursor_coordinates() | |
| arrow_x = x + ARROW_DISTANCE | |
| arrow_y = y + (h / 2) | |
| ctxt.move_to(arrow_x, arrow_y) | |
| ctxt.line_to(arrow_x + ARROW_LENGTH, arrow_y) | |
| ctxt.move_to(arrow_x, arrow_y) | |
| ctxt.line_to(arrow_x + ARROW_TRIANGLE_LENGTH, arrow_y - ARROW_TRIANGLE_WIDTH) | |
| ctxt.move_to(arrow_x, arrow_y) | |
| ctxt.line_to(arrow_x + ARROW_TRIANGLE_LENGTH, arrow_y + ARROW_TRIANGLE_WIDTH) | |
| ctxt.stroke() | |
| if __name__ == '__main__': | |
| win = MyWindow() | |
| win.connect('delete-event', Gtk.main_quit) | |
| win.show_all() | |
| Gtk.main() |
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Dirty code talk. Awesome. 💗