pysize/ui/gtk/pysize_widget_draw.py

   1 # This program is free software; you can redistribute it and/or modify
   2 # it under the terms of the GNU General Public License as published by
   3 # the Free Software Foundation; either version 2 of the License, or
   4 # (at your option) any later version.
   5 #
   6 # This program is distributed in the hope that it will be useful,
   7 # but WITHOUT ANY WARRANTY; without even the implied warranty of
   8 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9 # GNU Library General Public License for more details.
  10 #
  11 # You should have received a copy of the GNU General Public License
  12 # along with this program; if not, write to the Free Software
  13 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  14 #
  15 # See the COPYING file for license information.
  16 #
  17 # Copyright (c) 2006 Guillaume Chazarain <guichaz@yahoo.fr>
  18
  19 import pygtk
  20 pygtk.require('2.0')
  21 import gtk
  22 assert gtk.pygtk_version >= (2, 8)
  23 import pango
  24 import math
  25 import cairo
  26
  27 from pysize.ui.utils import human_unit, min_size_to_consider, sanitize_string
  28
  29 RADIUS = 10.0
  30 LINE_WIDTH = 4.0
  31
  32 class PysizeWidget_Draw(object):
  33     def __init__(self, options, args):
  34         self.connect('expose-event', type(self)._expose_event)
  35         self.modify_font(pango.FontDescription('Monospace 12'))
  36         self.max_text_height = self.measure_font_height()
  37         self.fast = options.fast
  38
  39     def measure_font_height(self):
  40         w, h = self.create_pango_layout('a').get_pixel_size()
  41         return h
  42
  43     def _get_requested_height(self):
  44         return self.max_text_height * self.tree.root.size / \
  45                 min_size_to_consider(self.options.min_size)
  46
  47     def queue_node_redraw(self, node):
  48         if node:
  49             x0, x1, y0, y1 = map(int, node.rectangle)
  50             self.queue_draw_area(x0 - LINE_WIDTH, y0 - LINE_WIDTH,
  51                                  x1 - x0 + 2*LINE_WIDTH, y1 - y0 + 2*LINE_WIDTH)
  52
  53     def _draw_text(self, context, text, (x0, x1, y0, y1), accept_ellipse=True):
  54         pl = self.create_pango_layout(text)
  55         pl.set_alignment(pango.ALIGN_CENTER)
  56         w = x1 - x0
  57         h = y1 - y0
  58         pl.set_width(int(w*pango.SCALE))
  59         if accept_ellipse:
  60             ellipse_mode = pango.ELLIPSIZE_MIDDLE
  61         else:
  62             ellipse_mode = pango.ELLIPSIZE_NONE
  63         pl.set_ellipsize(ellipse_mode)
  64         real_w, real_h = pl.get_pixel_size()
  65         line_count = pl.get_line_count()
  66         line_height = float(real_h) / line_count
  67         if line_height > self.max_text_height:
  68             self.max_text_height = line_height
  69         if line_count == text.count('\n') + 1 and real_w <= w and real_h <= h:
  70             context.move_to(x0, y0 + (h - real_h) / 2.0)
  71             context.show_layout(pl)
  72             return True
  73
  74     def _get_node_colors(self, node, is_selected, size_color, colors):
  75         def transform(colors, dr, dg, db):
  76             def clamp(c):
  77                 return max(0, min(1, c))
  78             return map(lambda (r, g, b): (clamp(r + dr),
  79                                           clamp(g + dg),
  80                                           clamp(b + db)),
  81                        colors)
  82
  83         if node.is_real() and not node.is_dir():
  84             colors = map(lambda (r, g, b): (b, g, r), colors)
  85
  86         if not node.is_real():
  87             colors = map(lambda c: (min(c), max(c), max(c)), colors)
  88
  89         size_delta = size_color(node.size)
  90         colors = transform(colors, size_delta, size_delta, size_delta)
  91
  92         if node == self.cursor_node:
  93             colors = transform(colors, 0.2, 0.2, 0.2)
  94         if is_selected:
  95             colors = transform(colors, -0.4, -0.4, -0.4)
  96         return colors
  97
  98     def _draw_box(self, context, x0, x1, y0, y1, node, size_color):
  99         if x0 == 0.0:
 100             x0 += LINE_WIDTH/2.0
 101         else:
 102             x0 += LINE_WIDTH/4.0
 103         x1 -= LINE_WIDTH/4.0
 104         if y0 == 0.0:
 105             y0 += LINE_WIDTH/2.0
 106         else:
 107             y0 += LINE_WIDTH/4.0
 108         y1 -= LINE_WIDTH/4.0
 109         node.rectangle = x0, x1, y0, y1
 110         is_selected = set(node.get_fullpaths()) <= self.selected_paths
 111         colors = self._get_node_colors(node, is_selected, size_color,
 112                                        ((0.5, 0.4, 1.0), (0.2, 0.4, 1.0)))
 113         context.set_source_rgb(0, 0, 0)
 114         if self.fast:
 115             context.rectangle(x0, y0, x1 - x0, y1 - y0)
 116             context.stroke_preserve()
 117
 118             context.set_source_rgb(*colors[0])
 119             context.fill()
 120         else:
 121             context.new_path()
 122             context.arc(x0 + RADIUS, y0 + RADIUS, RADIUS,
 123                         - math.pi, - math.pi / 2.0)
 124             context.rel_line_to(x1 - x0 - 2*RADIUS, 0)
 125             context.arc(x1 - RADIUS, y0 + RADIUS, RADIUS,
 126                         - math.pi / 2.0, 0)
 127             context.rel_line_to(0, y1 - y0 - 2*RADIUS)
 128             context.arc(x1 - RADIUS, y1 - RADIUS, RADIUS,
 129                         0, math.pi / 2.0)
 130             context.rel_line_to(- x1 + x0 + 2*RADIUS, 0)
 131             context.arc(x0 + RADIUS, y1 - RADIUS, RADIUS,
 132                         math.pi / 2.0, math.pi)
 133             context.close_path()
 134             context.stroke_preserve()
 135
 136             gradient = cairo.LinearGradient(0, y0, 0, y1)
 137
 138             gradient.add_color_stop_rgb(0.0, *colors[0])
 139             gradient.add_color_stop_rgb(1.0, *colors[1])
 140             context.set_source(gradient)
 141             context.fill()
 142
 143         name = sanitize_string(node.get_name())
 144         size = human_unit(node.size)
 145         position = x0, x1, y0, y1
 146         if is_selected:
 147             context.set_source_rgb(1, 1, 1)
 148         else:
 149             context.set_source_rgb(0, 0, 0)
 150         attempt = lambda text, pos, *flags: \
 151             self._draw_text(context, text, pos, *flags) or \
 152             self._draw_text(context, text,
 153                             (pos[0] - 1, pos[1] + 1, pos[2] - 1, pos[3] + 1),
 154                             *flags)
 155         attempt(name + '\n' + size, position) or \
 156         attempt(name + ' ' + size, position, False) or \
 157         attempt(name, position) or \
 158         attempt(size, position)
 159
 160     def _draw_boxes(self, context, node, depth, offset, size_color):
 161         w = self.allocation.width
 162         h = self.allocation.height
 163         x0 = depth * (w - 1.0) / (self.tree.height or 1)
 164         x1 = (depth + 1.0) * (w - 1.0) / (self.tree.height or 1)
 165         y0 = (h - 1.0) * offset / self.tree.root.size
 166         y1 = (h - 1.0) * (offset + node.size) / self.tree.root.size
 167
 168         self._draw_box(context, x0, x1, y0, y1, node, size_color)
 169         depth += 1
 170         for child in node.children:
 171             self._draw_boxes(context, child, depth, offset, size_color)
 172             offset += child.size
 173
 174     def _draw(self, context):
 175         max_text_height_before = self.max_text_height
 176         if self.tree.root.children:
 177             max_size = self.tree.root.children[0].size
 178             min_size = self.tree.root.minimum_node_size()
 179             diff = max(1, max_size - min_size)
 180             def size_color(size):
 181                 return 0.3 - (size - min_size) / (2.0 * diff)
 182         else:
 183             def size_color(size):
 184                 return 0
 185         context.set_line_width(LINE_WIDTH)
 186         offset = 0
 187         for child in self.tree.root.children or [self.tree.root]:
 188             if child.size:
 189                 self._draw_boxes(context, child, 0, offset, size_color)
 190                 offset += child.size
 191         if self.max_text_height != max_text_height_before:
 192             self.schedule_new_tree()
 193
 194     def _expose_event(self, event):
 195         context = self.window.cairo_create()
 196
 197         # set a clip region for the expose event
 198         context.rectangle(event.area.x, event.area.y,
 199                           event.area.width, event.area.height)
 200         context.clip()
 201
 202         self._draw(context)
 203         return False
 204
 205     def max_number_of_nodes(self):
 206         return max(2, self.allocation.height / self.max_text_height)
 207
 208     def _get_actual_min_size(self):
 209         min_size = self.options.min_size
 210         if min_size == 'auto':
 211             min_size = self.tree.root.size * self.min_size_requested()
 212         return int(min_size)
 213
 214     def _zoom(self, func):
 215         min_size = self._get_actual_min_size()
 216         self.options.min_size = func(min_size)
 217         self.schedule_new_tree()
 218
 219     def zoom_fit(self):
 220         self._zoom(lambda min_size: 'auto')
 221
 222     def zoom_in(self):
 223         self._zoom(lambda min_size: str(int(min_size / 1.5)))
 224
 225     def zoom_out(self):
 226         self._zoom(lambda min_size: str(int(min_size * 1.5)))