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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

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<title>widgets example code: menu.py — Matplotlib 2.0.0 documentation</title>

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<h1>widgets example code: menu.py<a class="headerlink" href="#widgets-example-code-menu-py" title="Permalink to this headline">¶</a></h1>

[<a class="reference external" href="menu.py">source code</a>]

<div class="highlight-default"><div class="highlight"><pre>from __future__ import division, print_function

import numpy as np

import matplotlib

import matplotlib.colors as colors

import matplotlib.patches as patches

import matplotlib.mathtext as mathtext

import matplotlib.pyplot as plt

import matplotlib.artist as artist

import matplotlib.image as image

class ItemProperties(object):

def __init__(self, fontsize=14, labelcolor='black', bgcolor='yellow',

alpha=1.0):

self.fontsize = fontsize

self.labelcolor = labelcolor

self.bgcolor = bgcolor

self.alpha = alpha

self.labelcolor_rgb = colors.to_rgba(labelcolor)[:3]

self.bgcolor_rgb = colors.to_rgba(bgcolor)[:3]

class MenuItem(artist.Artist):

parser = mathtext.MathTextParser("Bitmap")

padx = 5

pady = 5

def __init__(self, fig, labelstr, props=None, hoverprops=None,

on_select=None):

artist.Artist.__init__(self)

self.set_figure(fig)

self.labelstr = labelstr

if props is None:

props = ItemProperties()

if hoverprops is None:

hoverprops = ItemProperties()

self.props = props

self.hoverprops = hoverprops

self.on_select = on_select

x, self.depth = self.parser.to_mask(

labelstr, fontsize=props.fontsize, dpi=fig.dpi)

if props.fontsize != hoverprops.fontsize:

raise NotImplementedError(

'support for different font sizes not implemented')

self.labelwidth = x.shape[1]

self.labelheight = x.shape[0]

self.labelArray = np.zeros((x.shape[0], x.shape[1], 4))

self.labelArray[:, :, -1] = x/255.

self.label = image.FigureImage(fig, origin='upper')

self.label.set_array(self.labelArray)

# we'll update these later

self.rect = patches.Rectangle((0, 0), 1, 1)

self.set_hover_props(False)

fig.canvas.mpl_connect('button_release_event', self.check_select)

def check_select(self, event):

over, junk = self.rect.contains(event)

if not over:

return

if self.on_select is not None:

self.on_select(self)

def set_extent(self, x, y, w, h):

print(x, y, w, h)

self.rect.set_x(x)

self.rect.set_y(y)

self.rect.set_width(w)

self.rect.set_height(h)

self.label.ox = x + self.padx

self.label.oy = y - self.depth + self.pady/2.

self.rect._update_patch_transform()

self.hover = False

def draw(self, renderer):

self.rect.draw(renderer)

self.label.draw(renderer)

def set_hover_props(self, b):

if b:

props = self.hoverprops

else:

props = self.props

r, g, b = props.labelcolor_rgb

self.labelArray[:, :, 0] = r

self.labelArray[:, :, 1] = g

self.labelArray[:, :, 2] = b

self.rect.set(facecolor=props.bgcolor, alpha=props.alpha)

def set_hover(self, event):

'check the hover status of event and return true if status is changed'

b, junk = self.rect.contains(event)

changed = (b != self.hover)

if changed:

self.set_hover_props(b)

self.hover = b

return changed

class Menu(object):

self.figure = fig

fig.suppressComposite = True

self.menuitems = menuitems

self.numitems = len(menuitems)

maxw = max([item.labelwidth for item in menuitems])

maxh = max([item.labelheight for item in menuitems])

totalh = self.numitems*maxh + (self.numitems + 1)*2*MenuItem.pady

x0 = 100

y0 = 400

width = maxw + 2*MenuItem.padx

height = maxh + MenuItem.pady

for item in menuitems:

left = x0

bottom = y0 - maxh - MenuItem.pady

item.set_extent(left, bottom, width, height)

fig.artists.append(item)

y0 -= maxh + MenuItem.pady

fig.canvas.mpl_connect('motion_notify_event', self.on_move)

def on_move(self, event):

draw = False

for item in self.menuitems:

draw = item.set_hover(event)

if draw:

self.figure.canvas.draw()

break

fig = plt.figure()

fig.subplots_adjust(left=0.3)

props = ItemProperties(labelcolor='black', bgcolor='yellow',

fontsize=15, alpha=0.2)

hoverprops = ItemProperties(labelcolor='white', bgcolor='blue',

menuitems = []

for label in ('open', 'close', 'save', 'save as', 'quit'):

def on_select(item):

print('you selected %s' % item.labelstr)

item = MenuItem(fig, label, props=props, hoverprops=hoverprops,

on_select=on_select)

menuitems.append(item)

menu = Menu(fig, menuitems)

plt.show()

</pre></div>

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