ControlAdjuster.cc

   1 /*
   2  * Copyright (c) 2003, Frank Richter <frichter@gmx.li>
   3  * Copyright (c) 2003, Robert Collins <rbtcollins@hotmail.com>
   4  *
   5  *     This program is free software; you can redistribute it and/or modify
   6  *     it under the terms of the GNU General Public License as published by
   7  *     the Free Software Foundation; either version 2 of the License, or
   8  *     (at your option) any later version.
   9  *
  10  *     A copy of the GNU General Public License can be found at
  11  *     http://www.gnu.org/
  12  *
  13  * Written by Frank Richter.
  14  *
  15  */
  16
  17 #include "ControlAdjuster.h"
  18 #include "RECTWrapper.h"
  19
  20 void ControlAdjuster::AdjustControls (HWND dlg,
  21                                       const ControlInfo controlInfo[],
  22                                       int widthChange, int heightChange)
  23 {
  24   const ControlInfo* ci = controlInfo;
  25
  26   while (ci->control > 0)
  27   {
  28     ci->adjust(dlg, widthChange,heightChange);
  29     ci++;
  30   }
  31 }
  32
  33 void
  34 ControlAdjuster::ControlInfo::adjust(HWND dlg, int widthChange, int heightChange) const
  35 {
  36   HWND ctl = GetDlgItem (dlg, control);
  37   if (ctl == 0)
  38     return;
  39   RECTWrapper ctlRect;
  40   GetWindowRect (ctl, &ctlRect);
  41   // We want client coords.
  42   ScreenToClient (dlg, (LPPOINT)&ctlRect.left);
  43   ScreenToClient (dlg, (LPPOINT)&ctlRect.right);
  44
  45   ControlDimension horizontal(ctlRect.left, ctlRect.right);
  46   ControlDimension vertical(ctlRect.top, ctlRect.bottom);
  47   /*
  48     Now adjust the rectangle coordinates.
  49    */
  50   adjust(horizontalPos, horizontal, widthChange);
  51   adjust(verticalPos, vertical, heightChange);
  52   /* update the windows window */
  53   SetWindowPos (ctl, 0, ctlRect.left, ctlRect.top,
  54     ctlRect.width (), ctlRect.height (), SWP_NOACTIVATE | SWP_NOZORDER);
  55   // If not done, weird visual glitches can occur.
  56   InvalidateRect (ctl, 0, false);
  57 }
  58
  59 void
  60 ControlAdjuster::ControlInfo::adjust (ControlPosition const &how, ControlDimension &where, int by) const
  61 {
  62   switch (how)
  63     {
  64       case CP_LEFT:
  65         break;
  66       case CP_CENTERED:
  67         where.left += by/2;
  68         where.right += by - by/2;
  69         break;
  70       case CP_RIGHT:
  71         where.left += by;
  72         where.right += by;
  73         break;
  74       case CP_STRETCH:
  75         where.right += by;
  76         break;
  77       case CP_STRETCH_LEFTHALF:
  78         where.right += by/2;
  79         break;
  80       case CP_STRETCH_RIGHTHALF:
  81         where.left += by/2;
  82         where.right += by;
  83         break;
  84   }
  85 }
  86
  87 SizeProcessor::SizeProcessor ()
  88 {
  89   rectValid = false;
  90 }
  91
  92 void SizeProcessor::AddControlInfo (
  93   const ControlAdjuster::ControlInfo* controlInfo)
  94 {
  95   controlInfos.push_back (controlInfo);
  96 }
  97
  98 void SizeProcessor::UpdateSize (HWND dlg)
  99 {
 100   RECTWrapper clientRect;
 101   ::GetClientRect (dlg, &clientRect);
 102
 103   if (rectValid)
 104     {
 105       const int dX = clientRect.width () - lastRect.width ();
 106       const int dY = clientRect.height () - lastRect.height ();
 107       for (size_t i = 0; i < controlInfos.size (); i++)
 108         ControlAdjuster::AdjustControls (dlg, controlInfos[i], dX, dY);
 109     }
 110   else
 111     rectValid = true;
 112
 113   lastRect = clientRect;
 114 }