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() |
Author
@mlafeldt: You sure are gonna love the updated version where there is no constraint on the size of the arrow. You know... bigger is always better. Especially when it comes to pointless arrows.
Dirty code talk. Awesome. 💗
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I love it. :)