git.gag.com Git - debian/gnuradio/blob - grc/src/platforms/gui/Block.py

   1 """
   2 Copyright 2007 Free Software Foundation, Inc.
   3 This file is part of GNU Radio
   4
   5 GNU Radio Companion is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU General Public License
   7 as published by the Free Software Foundation; either version 2
   8 of the License, or (at your option) any later version.
   9
  10 GNU Radio Companion is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  18 """
  19
  20 from ... gui import Preferences
  21 from Element import Element
  22 import Utils
  23 import Colors
  24 from ... gui.Constants import BORDER_PROXIMITY_SENSITIVITY
  25 from Constants import \
  26         BLOCK_FONT, BLOCK_LABEL_PADDING, \
  27         PORT_SEPARATION, LABEL_SEPARATION, \
  28         PORT_BORDER_SEPARATION, POSSIBLE_ROTATIONS
  29 import pygtk
  30 pygtk.require('2.0')
  31 import gtk
  32 import pango
  33
  34 class Block(Element):
  35         """The graphical signal block."""
  36
  37         def __init__(self, *args, **kwargs):
  38                 """
  39                 Block contructor.
  40                 Add graphics related params to the block.
  41                 """
  42                 #add the position param
  43                 self._params['_coordinate'] = self.get_parent().get_parent().Param(
  44                         self,
  45                         {
  46                                 'name': 'GUI Coordinate',
  47                                 'key': '_coordinate',
  48                                 'type': 'raw',
  49                                 'value': '(0, 0)',
  50                                 'hide': 'all',
  51                         }
  52                 )
  53                 self._params['_rotation'] = self.get_parent().get_parent().Param(
  54                         self,
  55                         {
  56                                 'name': 'GUI Rotation',
  57                                 'key': '_rotation',
  58                                 'type': 'raw',
  59                                 'value': '0',
  60                                 'hide': 'all',
  61                         }
  62                 )
  63                 Element.__init__(self)
  64
  65         def get_coordinate(self):
  66                 """
  67                 Get the coordinate from the position param.
  68                 @return the coordinate tuple (x, y) or (0, 0) if failure
  69                 """
  70                 try: #should evaluate to tuple
  71                         coor = eval(self.get_param('_coordinate').get_value())
  72                         x, y = map(int, coor)
  73                         fgW,fgH = self.get_parent().get_size()
  74                         if x <= 0:
  75                                 x = 0
  76                         elif x >= fgW - BORDER_PROXIMITY_SENSITIVITY:
  77                                 x = fgW - BORDER_PROXIMITY_SENSITIVITY
  78                         if y <= 0:
  79                                 y = 0
  80                         elif y >= fgH - BORDER_PROXIMITY_SENSITIVITY:
  81                                 y = fgH - BORDER_PROXIMITY_SENSITIVITY
  82                         return (x, y)
  83                 except:
  84                         self.set_coordinate((0, 0))
  85                         return (0, 0)
  86
  87         def set_coordinate(self, coor):
  88                 """
  89                 Set the coordinate into the position param.
  90                 @param coor the coordinate tuple (x, y)
  91                 """
  92                 self.get_param('_coordinate').set_value(str(coor))
  93
  94         def get_rotation(self):
  95                 """
  96                 Get the rotation from the position param.
  97                 @return the rotation in degrees or 0 if failure
  98                 """
  99                 try: #should evaluate to dict
 100                         rotation = eval(self.get_param('_rotation').get_value())
 101                         return int(rotation)
 102                 except:
 103                         self.set_rotation(POSSIBLE_ROTATIONS[0])
 104                         return POSSIBLE_ROTATIONS[0]
 105
 106         def set_rotation(self, rot):
 107                 """
 108                 Set the rotation into the position param.
 109                 @param rot the rotation in degrees
 110                 """
 111                 self.get_param('_rotation').set_value(str(rot))
 112
 113         def update(self):
 114                 """Update the block, parameters, and ports when a change occurs."""
 115                 self.bg_color = self.get_enabled() and Colors.BG_COLOR or Colors.DISABLED_BG_COLOR
 116                 self.clear()
 117                 self._create_labels()
 118                 self.W = self.label_width + 2*BLOCK_LABEL_PADDING
 119                 self.H = max(*(
 120                         [self.label_height+2*BLOCK_LABEL_PADDING] + [2*PORT_BORDER_SEPARATION + \
 121                         sum([port.H + PORT_SEPARATION for port in ports]) - PORT_SEPARATION
 122                         for ports in (self.get_sources(), self.get_sinks())]
 123                 ))
 124                 if self.is_horizontal(): self.add_area((0, 0), (self.W, self.H))
 125                 elif self.is_vertical(): self.add_area((0, 0), (self.H, self.W))
 126                 map(lambda p: p.update(), self.get_ports())
 127
 128         def _create_labels(self):
 129                 """Create the labels for the signal block."""
 130                 layouts = list()
 131                 #create the main layout
 132                 layout = gtk.DrawingArea().create_pango_layout('')
 133                 layouts.append(layout)
 134                 if self.is_valid():     layout.set_markup('<b>'+Utils.xml_encode(self.get_name())+'</b>')
 135                 else: layout.set_markup('<span foreground="red"><b>'+Utils.xml_encode(self.get_name())+'</b></span>')
 136                 desc = pango.FontDescription(BLOCK_FONT)
 137                 layout.set_font_description(desc)
 138                 self.label_width, self.label_height = layout.get_pixel_size()
 139                 #display the params
 140                 if Preferences.show_params():
 141                         for param in filter(lambda p: p.get_hide() not in ('all', 'part'), self.get_params()):
 142                                 layout = param.get_layout()
 143                                 layouts.append(layout)
 144                                 w,h = layout.get_pixel_size()
 145                                 self.label_width = max(w, self.label_width)
 146                                 self.label_height = self.label_height + h + LABEL_SEPARATION
 147                 width = self.label_width
 148                 height = self.label_height
 149                 #setup the pixmap
 150                 pixmap = gtk.gdk.Pixmap(self.get_parent().get_window(), width, height, -1)
 151                 gc = pixmap.new_gc()
 152                 gc.foreground = self.bg_color
 153                 pixmap.draw_rectangle(gc, True, 0, 0, width, height)
 154                 gc.foreground = Colors.TXT_COLOR
 155                 #draw the layouts
 156                 h_off = 0
 157                 for i,layout in enumerate(layouts):
 158                         w,h = layout.get_pixel_size()
 159                         if i == 0: w_off = (width-w)/2
 160                         else: w_off = 0
 161                         pixmap.draw_layout(gc, w_off, h_off, layout)
 162                         h_off = h + h_off + LABEL_SEPARATION
 163                 #create vertical and horizontal images
 164                 self.horizontal_label = image = pixmap.get_image(0, 0, width, height)
 165                 if self.is_vertical():
 166                         self.vertical_label = vimage = gtk.gdk.Image(gtk.gdk.IMAGE_NORMAL, pixmap.get_visual(), height, width)
 167                         for i in range(width):
 168                                 for j in range(height): vimage.put_pixel(j, width-i-1, image.get_pixel(i, j))
 169                 map(lambda p: p._create_labels(), self.get_ports())
 170
 171         def draw(self, window):
 172                 """
 173                 Draw the signal block with label and inputs/outputs.
 174                 @param window the gtk window to draw on
 175                 """
 176                 x, y = self.get_coordinate()
 177                 #draw main block
 178                 Element.draw(self, window, BG_color=self.bg_color)
 179                 #draw label image
 180                 gc = self.get_gc()
 181                 if self.is_horizontal():
 182                         window.draw_image(gc, self.horizontal_label, 0, 0, x+BLOCK_LABEL_PADDING, y+(self.H-self.label_height)/2, -1, -1)
 183                 elif self.is_vertical():
 184                         window.draw_image(gc, self.vertical_label, 0, 0, x+(self.H-self.label_height)/2, y+BLOCK_LABEL_PADDING, -1, -1)
 185                 #draw ports
 186                 map(lambda p: p.draw(window), self.get_ports())
 187
 188         def what_is_selected(self, coor, coor_m=None):
 189                 """
 190                 Get the element that is selected.
 191                 @param coor the (x,y) tuple
 192                 @param coor_m the (x_m, y_m) tuple
 193                 @return this block, a port, or None
 194                 """
 195                 for port in self.get_ports():
 196                         port_selected = port.what_is_selected(coor, coor_m)
 197                         if port_selected: return port_selected
 198                 return Element.what_is_selected(self, coor, coor_m)