src/Screen/Layout.cpp

   1 /*
   2 Copyright_License {
   3
   4   XCSoar Glide Computer - http://www.xcsoar.org/
   5   Copyright (C) 2000-2013 The XCSoar Project
   6   A detailed list of copyright holders can be found in the file "AUTHORS".
   7
   8   This program is free software; you can redistribute it and/or
   9   modify it under the terms of the GNU General Public License
  10   as published by the Free Software Foundation; either version 2
  11   of the License, or (at your option) any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21 }
  22 */
  23
  24 #include "Screen/Layout.hpp"
  25 #include "Hardware/Display.hpp"
  26
  27 #include <algorithm>
  28
  29 using std::min;
  30 using std::max;
  31
  32 namespace Layout
  33 {
  34   bool landscape = false;
  35   bool square = false;
  36   int scale = 1;
  37   unsigned scale_1024 = 1024;
  38   unsigned small_scale = 1024;
  39   unsigned pen_width_scale = 1024;
  40   UPixelScalar text_padding = 2;
  41   UPixelScalar minimum_control_height = 22, maximum_control_height = 44;
  42   UPixelScalar hit_radius = 10;
  43 }
  44
  45 void
  46 Layout::Initialize(PixelSize new_size)
  47 {
  48   const unsigned width = new_size.cx, height = new_size.cy;
  49
  50   landscape = width > height;
  51   square = width == height;
  52
  53   if (!ScaleSupported())
  54     return;
  55
  56   const unsigned x_dpi = Display::GetXDPI();
  57
  58   unsigned minsize = min(width, height);
  59   // always start w/ shortest dimension
  60   // square should be shrunk
  61   scale_1024 = max(1024U, minsize * 1024 / (square ? 320 : 240));
  62   scale = scale_1024 / 1024;
  63
  64   small_scale = (scale_1024 - 1024) / 2 + 1024;
  65
  66   pen_width_scale = std::max(1024u, x_dpi * 1024u / 80u);
  67
  68   text_padding = Scale(2);
  69
  70   minimum_control_height = Scale(22);
  71
  72   if (HasTouchScreen()) {
  73     /* larger rows for touch screens */
  74     maximum_control_height = Display::GetYDPI() * 3 / 7;
  75     if (maximum_control_height < minimum_control_height)
  76       maximum_control_height = minimum_control_height;
  77   } else {
  78     maximum_control_height = minimum_control_height;
  79   }
  80
  81   hit_radius = x_dpi / (HasTouchScreen() ? 3 : 12);
  82 }