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from __future__ import with_statement
# Enthought library imports
from enable.api import ColorTrait, Component
from enable.font_metrics_provider import font_metrics_provider
from kiva.trait_defs.kiva_font_trait import KivaFont
from traits.api import Bool, Enum, Instance, Int, Property, Str, Tuple
class Button(Component):
color = ColorTrait((0.6, 0.6, 0.6, 1.0))
down_color = ColorTrait("gray")
border_color = ColorTrait((0.4, 0.4, 0.4, 1.0))
# important for rendering rounded buttons properly, since the default for
# the Component parent class is 'white'
bgcolor = "clear"
label = Str
label_font = KivaFont("modern 11 bold")
label_color = ColorTrait("white")
label_shadow = ColorTrait("gray")
shadow_text = Bool(True)
label_padding = Int(5)
height = Int(20)
button_state = Enum("up", "down")
end_radius = Int(10)
# Default size of the button if no label is present
bounds=[32,32]
# Cached value of the measured sizes of self.label
_text_extents = Tuple
def perform(self, event):
"""
Called when the button is depressed. 'event' is the Enable mouse event
that triggered this call.
"""
pass
def _draw_mainlayer(self, gc, view_bounds, mode="default"):
if self.button_state == "up":
self.draw_up(gc, view_bounds)
else:
self.draw_down(gc, view_bounds)
return
def draw_up(self, gc, view_bounds):
with gc:
gc.set_fill_color(self.color_)
self._draw_actual_button(gc)
return
def draw_down(self, gc, view_bounds):
with gc:
gc.set_fill_color(self.down_color_)
self._draw_actual_button(gc)
return
def _draw_actual_button(self, gc):
gc.set_stroke_color(self.border_color_)
gc.begin_path()
gc.move_to(self.x + self.end_radius, self.y)
gc.arc_to(self.x + self.width, self.y,
self.x + self.width,
self.y + self.end_radius, self.end_radius)
gc.arc_to(self.x + self.width,
self.y + self.height,
self.x + self.width - self.end_radius,
self.y + self.height, self.end_radius)
gc.arc_to(self.x, self.y + self.height,
self.x, self.y,
self.end_radius)
gc.arc_to(self.x, self.y,
self.x + self.width + self.end_radius,
self.y, self.end_radius)
gc.draw_path()
self._draw_label(gc)
def _draw_label(self, gc):
if self.label != "":
if self._text_extents is None or len(self._text_extents) == 0:
self._recompute_font_metrics()
x,y,w,h = self._text_extents
gc.set_font(self.label_font)
text_offset = 0.0
if self.shadow_text:
# Draw shadow text
gc.set_fill_color(self.label_shadow_)
x_pos = self.x + (self.width-w-x)/2 + 0.5
y_pos = self.y + (self.height-h-y)/2 - 0.5
gc.show_text_at_point(self.label, x_pos, y_pos)
text_offset = 0.5
# Draw foreground text to button
gc.set_fill_color(self.label_color_)
x_pos = self.x + (self.width-w-x)/2 - text_offset
y_pos = self.y + (self.height-h-y)/2 + text_offset
gc.show_text_at_point(self.label, x_pos, y_pos)
return
def normal_left_down(self, event):
self.button_state = "down"
self.request_redraw()
event.handled = True
return
def normal_left_up(self, event):
self.button_state = "up"
self.request_redraw()
self.perform(event)
event.handled = True
return
def _recompute_font_metrics(self):
if self.label != "":
metrics = font_metrics_provider()
metrics.set_font(self.label_font)
self._text_extents = metrics.get_text_extent(self.label)
def _label_font_changed(self, old, new):
self._recompute_font_metrics()
def _label_changed(self, old, new):
self._recompute_font_metrics()
class SampleButtonButton(Button):
label = Str('Sample Button')
def perform(self, event):
print "this button is a sample"
return
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