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#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
# I, Adam Olsen, am the original author of this work. I hereby
# donate it into the public domain, and relinquish any rights I
# may have in it.
#
# I, Behdad Esfahbod, hereby disclaim any rights for my contributions
# to this code.
from __future__ import division
import sys
import cairo
import pygtk
pygtk.require('2.0')
import gtk
import gtk.gdk
import pango
import gobject
def generate_modes():
for align_desc, align in [('left', pango.ALIGN_LEFT),
('center', pango.ALIGN_CENTER), ('right', pango.ALIGN_RIGHT)]:
for extent_desc, extentindex in [('logical', 1), ('ink', 0)]:
for name in ['line', 'run', 'cluster', 'char']:
if name == 'char' and extent_desc == 'ink':
continue
desc = '%s %s %s' % (align_desc, extent_desc, name)
yield extentindex, name, align, desc
class ExtentDemo(gtk.Widget):
def __init__(self, text="""Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor.\n\tسلامی چو بوی خوشِ آشنایی... بر آن ملّتِ دیرامدام دیرام..."""):
gtk.Widget.__init__(self)
self.text = "foo"
self.text = text
self.all_modes = list(generate_modes())
self.mode_num = 0;
self.x_margin = 5
self.y_margin = 5
self.x_offset = 0
self.y_offset = 25
self.font_size = 36
def do_realize(self):
self.set_flags(self.flags() | gtk.REALIZED)
self.window = gtk.gdk.Window(
self.get_parent_window(),
width=self.allocation.width,
height=self.allocation.height,
window_type=gtk.gdk.WINDOW_CHILD,
wclass=gtk.gdk.INPUT_OUTPUT,
event_mask=self.get_events() | gtk.gdk.EXPOSURE_MASK)
self.window.set_user_data(self)
self.style.attach(self.window)
self.style.set_background(self.window, gtk.STATE_NORMAL)
self.window.move_resize(*self.allocation)
def do_unrealize(self):
self.window.destroy()
def do_size_request(self, requisition):
width = 800
layout = self.get_layout(self.get_pango_context())
layout.set_width (pango.SCALE * (width - (self.x_offset + 2 * self.x_margin)))
height = layout.get_pixel_extents ()[1][3] + (self.y_offset + 2 * self.y_margin)
requisition.width = width
requisition.height = height
def do_expose_event(self, event):
context = self.window.cairo_create()
context.rectangle(event.area.x, event.area.y,
event.area.width, event.area.height)
context.clip()
pangocontext = self.get_pango_context()
self.draw(context, pangocontext)
return False
def get_layout (self, pangocontext):
font = pango.FontDescription()
font.set_family("sans")
font.set_size(self.font_size * pango.SCALE)
layout = pango.Layout(pangocontext)
layout.set_font_description(font)
layout.set_text(self.text)
return layout
def draw(self, context, pangocontext):
context.set_source_rgb (1, 1, 1)
context.paint()
context.set_source_rgb (0, 0, 0)
context.translate (self.x_margin, self.y_margin)
extentindex, name, align, desc = self.all_modes[self.mode_num]
labellayout = pango.Layout(pangocontext)
labellayout.set_text('%i: %s' % (self.mode_num + 1, desc))
context.move_to(0, 0)
context.show_layout(labellayout)
context.translate (self.x_offset, self.y_offset)
layout = self.get_layout (pangocontext)
width = self.allocation.width - (self.x_offset + 2 * self.x_margin)
layout.set_width(width * pango.SCALE)
layout.set_alignment(align)
context.move_to(0, 0)
#context.layout_path(layout)
#context.fill()
context.show_layout(layout)
context.set_source_rgba(1, 0, 0, 0.5)
context.set_line_width (2)
x, y, width, height = layout.get_pixel_extents()[extentindex]
context.rectangle(x-1, y-1, width+2, height+2)
context.stroke()
context.set_source_rgba(0, 1, 0, 0.7)
context.set_line_width (1)
li = layout.get_iter()
while True:
extents = getattr(li, 'get_%s_extents' % name)()
if name != 'char':
extents = extents[extentindex]
x, y, width, height = self._descale(extents)
context.rectangle(x+.5, y+.5, width-1, height-1)
context.stroke()
if not getattr(li, 'next_%s' % name)():
break
def cycle_mode_forward(self):
self.mode_num += 1
if self.mode_num >= len(self.all_modes):
self.mode_num = 0
self.queue_draw()
def cycle_mode_backward(self):
self.mode_num -= 1
if self.mode_num < 0:
self.mode_num = len(self.all_modes) - 1
self.queue_draw()
def key_press_event(self, widget, event):
if event.string == ' ' or event.keyval == gtk.keysyms.Right:
self.cycle_mode_forward()
elif event.keyval == gtk.keysyms.BackSpace or event.keyval == gtk.keysyms.Left:
self.cycle_mode_backward()
elif event.string == 'q':
gtk.main_quit()
def _descale(self, rect):
return (i / pango.SCALE for i in rect)
def run(self):
window = gtk.Window()
window.add(self)
window.connect("destroy", gtk.main_quit)
window.connect("key-press-event", self.key_press_event)
window.show_all()
gtk.main()
gobject.type_register(ExtentDemo)
def main():
if len (sys.argv) > 2:
ed = ExtentDemo(sys.argv[2])
else:
ed = ExtentDemo()
if len (sys.argv) > 1:
mode = int(sys.argv[1])
while mode > 1:
mode -= 1
ed.cycle_mode()
ed.run()
if __name__ == "__main__":
main()
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