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"""
This allows a simple component to be moved around the screen.
"""
from enable.example_support import DemoFrame, demo_main
from traits.api import Float
from enable.api import Component, Pointer, Window
class Box(Component):
"""
The box moves wherever the user clicks and drags.
"""
normal_pointer = Pointer("arrow")
moving_pointer = Pointer("hand")
offset_x = Float
offset_y = Float
fill_color = (0.8, 0.0, 0.1, 1.0)
moving_color = (0.0, 0.8, 0.1, 1.0)
resizable = ""
def _draw_mainlayer(self, gc, view_bounds=None, mode="default"):
with gc:
if self.event_state == "moving":
gc.set_fill_color(self.moving_color)
else:
gc.set_fill_color(self.fill_color)
dx, dy = self.bounds
x, y = self.position
gc.rect(x, y, dx, dy)
gc.fill_path()
# draw line around outer box
gc.set_stroke_color((0,0,0,1))
gc.rect(self.outer_x, self.outer_y, self.outer_width,
self.outer_height)
gc.stroke_path()
return
def normal_key_pressed(self, event):
print "Key:", event.character
def normal_left_down(self, event):
self.event_state = "moving"
event.window.set_pointer(self.moving_pointer)
event.window.set_mouse_owner(self, event.net_transform())
self.offset_x = event.x - self.x
self.offset_y = event.y - self.y
event.handled = True
return
def moving_mouse_move(self, event):
self.position = [event.x-self.offset_x, event.y-self.offset_y]
event.handled = True
self.request_redraw()
return
def moving_left_up(self, event):
self.event_state = "normal"
event.window.set_pointer(self.normal_pointer)
event.window.set_mouse_owner(None)
event.handled = True
self.request_redraw()
return
def moving_mouse_leave(self, event):
self.moving_left_up(event)
event.handled = True
return
class MyFrame(DemoFrame):
def _create_window(self):
box = Box(bounds=[100,100], position=[50,50], padding=15)
return Window(self, -1, component=box)
if __name__ == "__main__":
# Save demo so that it doesn't get garbage collected when run within
# existing event loop (i.e. from ipython).
demo = demo_main(MyFrame, title="Click and drag to move the box")
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