def update_layout(self, rectangle=None):
if rectangle is None:
rectangle = self.allocation
# print 'updating layout'
self.available_width = rectangle[2] - 2 * BORDER_SIZE
self.cell_width = self.thumbnail_width + 2 * CELL_BORDER_WIDTH
self.cell_height = self.thumbnail_height + 2 * CELL_BORDER_WIDTH
self.cells_per_row = max(int(self.available_width / self.cell_width),
1)
self.cell_width += \
(self.available_width - self.cells_per_row * self.cell_width) \
/ self.cells_per_row
if True: # display date
metrics = self.get_pango_context().\
get_metrics(self.style.font_desc, pango.Language('en_US'))
self.cell_height += pango.PIXELS(metrics.get_ascent() +
metrics.get_descent())
self.num_thumbnails = len(self.items)
self.num_rows = int(self.num_thumbnails / self.cells_per_row)
if self.num_thumbnails % self.cells_per_row:
self.num_rows += 1
self.height = int(self.num_rows * self.cell_height + 2 * BORDER_SIZE)
vadjustment = self.get_vadjustment()
hadjustment = self.get_hadjustment()
vadjustment.step_increment = self.cell_height
x = hadjustment.value
y = self.height * self.scroll_value
self.set_size(x, y, self.allocation.width, self.height)
def draw_on_surface(surface, text, params):
"""Draw the string on a pre-created surface and return height."""
pangocairo_ctx = pangocairo.CairoContext(cairo.Context(surface))
layout = pangocairo_ctx.create_layout()
pango_ctx = layout.get_context()
if params.language is not None:
pango_ctx.set_language(pango.Language(params.language))
if params.rtl:
if params.vertical:
base_dir = pango.DIRECTION_TTB_RTL
else:
base_dir = pango.DIRECTION_RTL
alignment = pango.ALIGN_RIGHT
else:
if params.vertical:
base_dir = pango.DIRECTION_TTB_LTR
else:
base_dir = pango.DIRECTION_LTR
alignment = pango.ALIGN_LEFT
pango_ctx.set_base_dir(base_dir)
layout.set_alignment(alignment)
layout.set_width(params.width * pango.SCALE)
layout.set_spacing((params.line_spacing - params.font_size) * pango.SCALE)
font = pango.FontDescription()
font.set_family(params.family)
font.set_size(params.font_size * pango.SCALE)
font.set_style(params.style)
font.set_weight(params.weight)
layout.set_font_description(font)
layout.set_text(text)
# # Doesn't work for some reason
# pango_ctx.set_base_gravity(pango.GRAVITY_AUTO)
# matrix = pango_ctx.get_matrix()
# matrix.rotate(90)
# pango_ctx.set_matrix(matrix)
# layout.context_changed()
extents = layout.get_pixel_extents()
top_usage = min(extents[0][1], extents[1][1], 0)
bottom_usage = max(extents[0][3], extents[1][3])
pangocairo_ctx.set_antialias(cairo.ANTIALIAS_GRAY)
pangocairo_ctx.set_source_rgb(1, 1, 1) # White background
pangocairo_ctx.paint()
pangocairo_ctx.translate(0, -top_usage)
pangocairo_ctx.set_source_rgb(0, 0, 0) # Black text color
pangocairo_ctx.show_layout(layout)
return bottom_usage - top_usage
def draw_on_surface(surface, text, params):
"""Draw the string on a pre-created surface and return height."""
pangocairo_ctx = pangocairo.CairoContext(cairo.Context(surface))
layout = pangocairo_ctx.create_layout()
pango_ctx = layout.get_context()
if params.language is not None:
pango_ctx.set_language(pango.Language(params.language))
if params.rtl:
if params.vertical:
base_dir = pango.DIRECTION_TTB_RTL
else:
base_dir = pango.DIRECTION_RTL
alignment = pango.ALIGN_RIGHT
else:
if params.vertical:
base_dir = pango.DIRECTION_TTB_LTR
else:
base_dir = pango.DIRECTION_LTR
alignment = pango.ALIGN_LEFT
# The actual meaning of alignment is confusing.
#
# In an RTL context, RTL text aligns to the right by default. So
# setting right alignment and an RTL context means asking for
# 'default alignment' (just as does setting left alignment and an
# LTR context).
#
# What actually happens depends on the directionality of the actual
# text in the paragraph. If the text is Arabic this will be RTL, so
# it is aligned to the right, the default alignment for RTL text.
# And if the text is English this will be LTR, so it is aligned to
# the left, the default alignment for LTR text.
#
# This is reversed when the context and the alignment disagree:
# setting left alignment in an RTL context (or right alignment in an
# LTR context) means asking for 'opposite alignment'. Arabic text
# is aligned to the left, and English text to the right.
#
# pango layout set_auto_dir controls whether the text direction
# is based on the text itself, or influenced by the context. By
# default it is off so the text direction is completely independent
# of the setting of the context: Arabic text is RTL and English text
# is LTR. However, the algorithm depends on the first 'strongly
# directional' character encountered in a paragraph. If you have
# text that is largly Arabic but happens to start with English
# (e.g. brand names) it will be assigned LTR, the wrong direction.
# Either you force the correct direction by munging the text or you
# tell pango to use the context.
#
# The text will be reordered based on the unicode bidi attributes
# of the characters, and this is only as good as your unicode data.
# Newly-encoded scripts can be newer than your libraries and will
# likely order LTR if you implementation doesn't know about them.
font = pango.FontDescription()
font.set_family(params.family)
font.set_size(params.font_size * pango.SCALE)
font.set_style(params.style)
font.set_weight(params.weight)
font.set_stretch(params.stretch)
layout.set_font_description(font)
layout.set_alignment(alignment)
layout.set_width(params.width * pango.SCALE)
layout.set_wrap(pango.WRAP_WORD_CHAR)
layout.set_spacing((params.line_spacing - params.font_size) * pango.SCALE)
pango_ctx.set_base_dir(base_dir)
layout.context_changed()
layout.set_text(text)
extents = layout.get_pixel_extents()
top_usage = min(extents[0][1], extents[1][1], 0)
bottom_usage = max(extents[0][3], extents[1][3])
pangocairo_ctx.set_antialias(cairo.ANTIALIAS_GRAY)
pangocairo_ctx.set_source_rgb(1, 1, 1) # White background
pangocairo_ctx.paint()
pangocairo_ctx.translate(0, -top_usage)
pangocairo_ctx.set_source_rgb(0, 0, 0) # Black text color
pangocairo_ctx.show_layout(layout)
return bottom_usage - top_usage
context.fill()
#get font families:
font_map = pangocairo.cairo_font_map_get_default()
families = font_map.list_families()
print families[0]
# to see family names:
print sorted([f.get_name() for f in font_map.list_families()])
font_name = [
'Noto Sans Mono CJK SC', 'WenQuanYi Micro Hei Mono',
'YaHei Consolas Hybrid', 'Menlo Regular'
][1]
pc = pango.Context()
pc.set_language(pango.Language("zh_CN.UTF-8"))
font = pango.FontDescription(' '.join([font_name, str(15)]))
context.translate(50, 25)
f_o = cairo.FontOptions()
f_o.set_antialias(cairo.ANTIALIAS_NONE)
f_o.set_hint_style(cairo.HINT_STYLE_SLIGHT)
f_o.set_hint_metrics(cairo.HINT_METRICS_ON)
context.set_font_options(f_o)
p_c = pangocairo_context = pangocairo.CairoContext(context)
#pangocairo_context.set_antialias(cairo.ANTIALIAS_SUBPIXEL)
def get_language(code):
"""Provide a pango.Language and keep it for reuse."""
global _languages
if not code in _languages:
_languages[code] = pango.Language(code)
return _languages[code]