hi all,
im trying write my first custom widget.
its cairo slider. on my first look im happy :) but i know that code is
ugly. if this code running, Xorg is on 50% and python thread is on 49%
CPU !!!. ( using 'top' in console ).
Kick me to the right way with this code snipet pls.
where is error ? Why too much cpu power ?
PS: sry for my english.
''' Custom slider '''
import gtk, cairo
from math import pi
def draw_widget(context, x, y, w, h, color=(0.0, 0.0, 0.0), radius=5):
''' nakresli obdelnik s radiusy '''
cr = context
cr.set_source_rgb(0.3, 0.4, 0.2)
arc2bezier = 0.55228475
if radius > w - radius: radius = w / 2
elif radius > h - radius: radius = h / 2
c1 = arc2bezier * radius
c2 = arc2bezier * radius
cr.new_path()
cr.move_to( x + radius, y)
cr.rel_line_to(w - 2 * radius, 0.0)
cr.rel_curve_to(c1, 0.0, radius, c2, radius, radius)
cr.rel_line_to(0, h - 2 * radius)
cr.rel_curve_to(0.0, c2, c1 - radius, radius, -radius, radius)
cr.rel_line_to(-w + 2 * radius, 0)
cr.rel_curve_to(-c1, 0, -radius, -c2, -radius, -radius)
cr.rel_line_to(0, -h + 2 * radius)
cr.rel_curve_to(0.0, -c2, radius - c1, -radius, radius, -radius)
cr.close_path()
cr.stroke_preserve()
cr.set_source_rgb(color[0], color[1], color[2])
cr.fill()
class App:
def __init__(self):
self.wnd = gtk.Window()
self.wnd.set_border_width(5)
self.wnd.connect('destroy', lambda x: gtk.main_quit())
self.area = gtk.DrawingArea()
self.area.set_size_request(32, 200)
self.area.add_events(gtk.gdk.POINTER_MOTION_MASK | gtk.gdk.BUTTON_PRESS_MASK)
#self.area.connect('expose-event', self.expose)
self.area.connect('expose-event', self.expose)
self.wnd.add(self.area)
self.wnd.show_all()
self.old_y = 10
def expose(self, widget, event):
#print event.type
ctx = widget.window.cairo_create()
ctx.set_line_width(3)
draw_widget(ctx, 10, 10, 8, 180, radius=10)
ctx.set_source_rgb(0.5, 0.5, 0.5)
ctx.arc(14, self.old_y, 9, 0, 2 * pi)
ctx.stroke_preserve()
ctx.set_source_rgb(1.0, 0.0, 0.0)
ctx.fill()
posx, posy, flag = widget.window.get_pointer()
if flag & gtk.gdk.BUTTON1_MASK:
if posx > 5 and posx < 15:
if posy < 10: posy = 10
if posy > 180: posy = 180
self.old_y = posy
self.area.queue_draw()
APP = App()
gtk.main()
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