src/TortoiseIDiff/NiceTrackbar.cpp

   1 // TortoiseIDiff - an image diff viewer in TortoiseSVN\r
   2 \r
   3 // Copyright (C) 2006 - 2008 - TortoiseSVN\r
   4 \r
   5 // This program is free software; you can redistribute it and/or\r
   6 // modify it under the terms of the GNU General Public License\r
   7 // as published by the Free Software Foundation; either version 2\r
   8 // of the License, or (at your option) any later version.\r
   9 \r
  10 // This program is distributed in the hope that it will be useful,\r
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  13 // GNU General Public License for more details.\r
  14 \r
  15 // You should have received a copy of the GNU General Public License\r
  16 // along with this program; if not, write to the Free Software Foundation,\r
  17 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.\r
  18 //\r
  19 #include "StdAfx.h"\r
  20 #include "NiceTrackbar.h"\r
  21 #include <tchar.h>\r
  22 #include <CommCtrl.h>\r
  23 #include <WindowsX.h>\r
  24 \r
  25 \r
  26 LRESULT CALLBACK CNiceTrackbar::NiceTrackbarProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)\r
  27 {\r
  28         CNiceTrackbar* self = (CNiceTrackbar*)GetWindowLongPtr(hwnd, GWLP_USERDATA);\r
  29 \r
  30         switch (message) {\r
  31         case WM_LBUTTONDOWN:\r
  32                 self->m_Dragging = true;\r
  33                 self->m_DragChanged = false;\r
  34                 SetCapture(hwnd);\r
  35                 //SetFocus(hwnd);\r
  36                 if (self->SetThumb(lParam)) {\r
  37                         self->m_DragChanged = true;\r
  38                         self->PostMessageToParent(TB_THUMBTRACK);\r
  39                 }\r
  40                 return 0;\r
  41         case WM_MOUSEMOVE:\r
  42                 if (self->m_Dragging)\r
  43                 {\r
  44                         if (self->SetThumb(lParam))\r
  45                         {\r
  46                                 self->m_DragChanged = true;\r
  47                                 self->PostMessageToParent(TB_THUMBTRACK);\r
  48                         }\r
  49                         return 0;\r
  50                 }\r
  51                 break;\r
  52         case WM_LBUTTONUP:\r
  53                 if (self->m_Dragging)\r
  54                 {\r
  55                         self->m_Dragging = false;\r
  56                         ReleaseCapture();\r
  57                         if (self->SetThumb(lParam))\r
  58                         {\r
  59                                 self->PostMessageToParent(TB_ENDTRACK);\r
  60                                 self->m_DragChanged = true;\r
  61                         }\r
  62                         if (self->m_DragChanged)\r
  63                         {\r
  64                                 self->PostMessageToParent(TB_THUMBPOSITION);\r
  65                                 self->m_DragChanged = false;\r
  66                         }\r
  67                         return 0;\r
  68                 }\r
  69                 break;\r
  70         case WM_DESTROY:\r
  71                 SetWindowLongPtr (hwnd, GWLP_WNDPROC, (LONG_PTR)self->m_OrigProc);\r
  72                 break;\r
  73         }\r
  74         return CallWindowProc (self->m_OrigProc, hwnd, message, wParam, lParam);\r
  75 }\r
  76 \r
  77 \r
  78 void CNiceTrackbar::ConvertTrackbarToNice( HWND window )\r
  79 {\r
  80         m_Window = window;\r
  81 \r
  82         // setup this pointer\r
  83         SetWindowLongPtr( window, GWLP_USERDATA, (LONG_PTR)this );\r
  84 \r
  85         // subclass it\r
  86         m_OrigProc = (WNDPROC)SetWindowLongPtr( window, GWLP_WNDPROC, (LONG_PTR)NiceTrackbarProc );\r
  87 }\r
  88 \r
  89 \r
  90 bool CNiceTrackbar::SetThumb (LPARAM lparamPoint)\r
  91 {\r
  92         POINT point = { GET_X_LPARAM(lparamPoint), GET_Y_LPARAM(lparamPoint) };\r
  93         const int nMin = (int)SendMessage(m_Window, TBM_GETRANGEMIN, 0, 0l);\r
  94         const int nMax = (int)SendMessage(m_Window, TBM_GETRANGEMAX, 0, 0l);\r
  95         RECT rc;\r
  96         SendMessage(m_Window, TBM_GETCHANNELRECT, 0, (LPARAM)&rc);\r
  97         double ratio;\r
  98         if (GetWindowLong(m_Window, GWL_STYLE) & TBS_VERT)\r
  99         {\r
 100                 // note: for vertical trackbar, it still returns the rectangle as if it was horizontal\r
 101                 ratio = (double)(point.y - rc.left)/(rc.right - rc.left);\r
 102         }\r
 103         else\r
 104         {\r
 105                 ratio = (double)(point.x - rc.left)/(rc.right - rc.left);\r
 106         }\r
 107 \r
 108         int nNewPos = (int)(nMin + (nMax-nMin)*ratio + 0.5); // round the result to go to the nearest tick mark\r
 109 \r
 110         const bool changed = (nNewPos != (int)SendMessage(m_Window, TBM_GETPOS, 0, 0));\r
 111         if (changed)\r
 112         {\r
 113                 SendMessage(m_Window, TBM_SETPOS, TRUE, nNewPos);\r
 114         }\r
 115         return changed;\r
 116 }\r
 117 \r
 118 \r
 119 void CNiceTrackbar::PostMessageToParent (int tbCode) const\r
 120 {\r
 121         HWND parent = GetParent(m_Window);\r
 122         if (parent) {\r
 123                 int pos = (int)SendMessage(m_Window, TBM_GETPOS, 0, 0);\r
 124                 bool vert = (GetWindowLong(m_Window, GWL_STYLE) & TBS_VERT) != 0;\r
 125                 PostMessage( parent, vert ? WM_VSCROLL : WM_HSCROLL, (WPARAM)((pos << 16) | tbCode), (LPARAM)m_Window );\r
 126         }\r
 127 }\r