ui/gtk/pysize_widget.py

   1 import math
   2 import cairo
   3 import pygtk
   4 import pango
   5 pygtk.require('2.0')
   6 import gtk
   7 assert gtk.pygtk_version >= (2, 8)
   8
   9 from core.pysize_fs_tree import pysize_tree
  10 from ui.utils import human_unit
  11
  12 RADIUS = 20.0
  13 LINE_WIDTH = 4.0
  14 CAIRO_IS_FAST = True
  15
  16 class PysizeWidget(gtk.DrawingArea):
  17     def __init__(self, options, args):
  18         super(PysizeWidget, self).__init__()
  19         self.connect('expose-event', self._expose)
  20         self.connect('realize', self._realize)
  21         self.connect('motion-notify-event', self._motion)
  22         self.connect('configure-event', self._configure)
  23         self.connect('key-press-event', self._key_press)
  24         self.connect('button-press-event', self._button_press)
  25         self.connect('button-release-event', self._button_release)
  26         self.set_flags(gtk.CAN_FOCUS)
  27         self.modify_font(pango.FontDescription('Monospace 12'))
  28         self.options = options
  29         self.args = args
  30         self.needs_tree = True
  31         self.tree = pysize_tree(args[0], options.max_depth, 1.0)
  32         self.selected_nodes = []
  33         self.cursor_node = None
  34         self.button_press_node = None
  35
  36     def _get_node_here(self, event):
  37         for node in self.tree.root:
  38             if node.contains_point(event):
  39                 return node
  40
  41     def _queue_node_redraw(self, node):
  42         if node:
  43             (x0, x1, y0, y1) = map(int, node.rectangle)
  44             self.queue_draw_area(x0, y0, x1 - x0, y1 - y0)
  45
  46     def _button_press(self, widget, event):
  47         node = self._get_node_here(event)
  48         if not node is self.button_press_node:
  49             self._queue_node_redraw(self.button_press_node)
  50             self._queue_node_redraw(node)
  51             self.button_press_node = node
  52
  53     def _button_release(self, widget, event):
  54         node = self._get_node_here(event)
  55         self._queue_node_redraw(self.button_press_node)
  56         self._queue_node_redraw(node)
  57         same_as_press = node is self.button_press_node
  58         self.button_press_node = None
  59         if same_as_press:
  60             for n in self.selected_nodes:
  61                 self._queue_node_redraw(n)
  62             self._queue_node_redraw(node)
  63             if event.state & gtk.gdk.CONTROL_MASK:
  64                 self.selected_nodes.append(node)
  65             else:
  66                 self.selected_nodes = [node]
  67
  68     def _key_press(self, widget, event):
  69         directions = {
  70             gtk.keysyms.Left: self.tree.get_parent,
  71             gtk.keysyms.Up: self.tree.get_previous_sibling,
  72             gtk.keysyms.Right: self.tree.get_first_child,
  73             gtk.keysyms.Down: self.tree.get_next_sibling
  74         }
  75
  76         action = directions.get(event.keyval, None)
  77         if action and not self.cursor_node is None:
  78             new_selection = action(self.cursor_node)
  79             if not new_selection in (None, self.tree.root):
  80                 self._queue_node_redraw(self.cursor_node)
  81                 self._queue_node_redraw(new_selection)
  82                 self.cursor_node = new_selection
  83
  84     def _realize(self, widget):
  85         events = self.window.get_events()
  86         events |= gtk.gdk.POINTER_MOTION_MASK
  87         events |= gtk.gdk.POINTER_MOTION_HINT_MASK
  88         events |= gtk.gdk.KEY_PRESS_MASK
  89         events |= gtk.gdk.BUTTON_PRESS_MASK
  90         events |= gtk.gdk.BUTTON_RELEASE_MASK
  91         self.window.set_events(events)
  92         self.window.get_pointer()
  93
  94     def _configure(self, widget, event):
  95         self.needs_tree = True
  96
  97     def _motion(self, widget, event):
  98         prev_selection = new_selection = self.cursor_node
  99         for node in self.tree.root:
 100             was_selected = node is prev_selection
 101             if node.contains_point(event) != (node is prev_selection):
 102                 if node is prev_selection:
 103                     new_selection = None
 104                 else:
 105                     new_selection = node
 106                 self._queue_node_redraw(self.cursor_node)
 107                 self._queue_node_redraw(new_selection)
 108                 self.cursor_node = new_selection
 109         if prev_selection is new_selection:
 110             self.window.get_pointer()
 111
 112     def _expose(self, widget, event):
 113         context = widget.window.cairo_create()
 114
 115         # set a clip region for the expose event
 116         context.rectangle(event.area.x, event.area.y,
 117                           event.area.width, event.area.height)
 118         context.clip()
 119
 120         self._draw(context)
 121         self.window.get_pointer()
 122         return False
 123
 124     def _draw_text(self, context, text, x0, x1, y0, y1):
 125         pl = self.create_pango_layout(text)
 126         w = x1 - x0
 127         h = y1 - y0
 128         pl.set_width(int(w*pango.SCALE))
 129         pl.set_ellipsize(pango.ELLIPSIZE_MIDDLE)
 130         (real_w, real_h) = pl.get_pixel_size()
 131         if real_w > w or real_h > h:
 132             return False
 133         if real_w+w/20.0 < w:
 134             x0 += w/20.0
 135         context.move_to(x0, y0+(h-real_h)/2.0)
 136         context.set_source_rgb(0, 0, 0)
 137         context.show_layout(pl)
 138         return True
 139
 140     def _get_node_colors(self, node, colors):
 141         if node is self.cursor_node:
 142             colors = map(lambda c: c+0.2, colors)
 143         if node in self.selected_nodes:
 144             colors.reverse()
 145         if node is self.button_press_node:
 146             colors = map(lambda c: c+0.2, colors)
 147         return colors
 148
 149     def _draw_box(self, context, x0, x1, y0, y1, node):
 150         x0 += LINE_WIDTH/4.0
 151         x1 -= LINE_WIDTH/4.0
 152         y0 += LINE_WIDTH/4.0
 153         y1 -= LINE_WIDTH/4.0
 154         node.rectangle = (x0, x1, y0, y1)
 155
 156         if CAIRO_IS_FAST:
 157             context.new_path()
 158             context.arc(x0 + RADIUS, y0 + RADIUS, RADIUS,
 159                         - math.pi, - math.pi / 2.0)
 160             context.rel_line_to(x1 - x0 - 2*RADIUS, 0)
 161             context.arc(x1 - RADIUS, y0 + RADIUS, RADIUS,
 162                         - math.pi / 2.0, 0)
 163             context.rel_line_to(0, y1 - y0 - 2*RADIUS)
 164             context.arc(x1 - RADIUS, y1 - RADIUS, RADIUS,
 165                         0, math.pi / 2.0)
 166             context.rel_line_to(- x1 + x0 + 2*RADIUS, 0)
 167             context.arc(x0 + RADIUS, y1 - RADIUS, RADIUS,
 168                         math.pi / 2.0, math.pi)
 169             context.close_path()
 170
 171             context.set_source_rgb(0, 0, 0)
 172             context.stroke_preserve()
 173
 174             gradient = cairo.LinearGradient(0, y0, 0, y1)
 175             colors = self._get_node_colors(node, [0.5, 0.5, 1.0, 0.0, 0.5, 1.0])
 176             gradient.add_color_stop_rgb(0.0, *colors[:3])
 177             gradient.add_color_stop_rgb(1.0, *colors[3:])
 178             context.set_source(gradient)
 179             context.fill()
 180         else:
 181             context.rectangle(x0, y0, x1 - x0, y1 - y0)
 182             context.set_source_rgb(0, 0, 0)
 183             context.stroke_preserve()
 184
 185             colors = self._get_node_colors(node, [0, 0.5, 1.0])
 186             context.set_source_rgb(*colors)
 187             context.fill()
 188
 189         name = node.get_name()
 190         size = human_unit(node.size)
 191         if not self._draw_text(context, name + '\n' + size, x0, x1, y0, y1):
 192             first, second = name, size
 193             if not node.is_real():
 194                 first, second = second, first
 195             if not self._draw_text(context, first, x0, x1, y0, y1):
 196                 self._draw_text(context, second, x0, x1, y0, y1)
 197
 198     def _draw_boxes(self, context, node, depth, offset):
 199         w = self.allocation.width
 200         h = self.allocation.height
 201         x0 = depth * (w - 1.0) / self.tree.height
 202         x1 = (depth + 1.0) * (w - 1.0) / self.tree.height
 203         y0 = (h - 1.0) * offset / self.tree.root.size
 204         y1 = (h - 1.0) * (offset + node.size) / self.tree.root.size
 205
 206         self._draw_box(context, x0, x1, y0, y1, node)
 207         depth += 1
 208         for child in node.get_children():
 209             self._draw_boxes(context, child, depth, offset)
 210             offset += child.size
 211
 212     def _draw(self, context):
 213         if self.needs_tree:
 214             self.tree = pysize_tree(self.args[0], self.options.max_depth,
 215                                     2*RADIUS /self.allocation.height)
 216             self.needs_tree = False
 217         if not self.tree.root:
 218             return
 219         context.set_line_width(LINE_WIDTH)
 220         offset = 0
 221         for child in self.tree.root.get_children():
 222             self._draw_boxes(context, child, 0, offset)
 223             offset += child.size