src/kits/tracker/SlowMenu.cpp

   1 /*
   2 Open Tracker License
   3
   4 Terms and Conditions
   5
   6 Copyright (c) 1991-2000, Be Incorporated. All rights reserved.
   7
   8 Permission is hereby granted, free of charge, to any person obtaining a copy of
   9 this software and associated documentation files (the "Software"), to deal in
  10 the Software without restriction, including without limitation the rights to
  11 use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
  12 of the Software, and to permit persons to whom the Software is furnished to do
  13 so, subject to the following conditions:
  14
  15 The above copyright notice and this permission notice applies to all licensees
  16 and shall be included in all copies or substantial portions of the Software.
  17
  18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF TITLE, MERCHANTABILITY,
  20 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21 BE INCORPORATED BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF, OR IN CONNECTION
  23 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24
  25 Except as contained in this notice, the name of Be Incorporated shall not be
  26 used in advertising or otherwise to promote the sale, use or other dealings in
  27 this Software without prior written authorization from Be Incorporated.
  28
  29 Tracker(TM), Be(R), BeOS(R), and BeIA(TM) are trademarks or registered trademarks
  30 of Be Incorporated in the United States and other countries. Other brand product
  31 names are registered trademarks or trademarks of their respective holders.
  32 All rights reserved.
  33 */
  34
  35
  36 #include "SlowMenu.h"
  37
  38
  39 const int32 kItemsToAddChunk = 20;
  40 const bigtime_t kMaxTimeBuildingMenu = 200000;
  41
  42
  43 //      #pragma mark - BSlowMenu
  44
  45
  46 BSlowMenu::BSlowMenu(const char* title, menu_layout layout)
  47         :
  48         BMenu(title, layout),
  49         fMenuBuilt(false)
  50 {
  51 }
  52
  53
  54 bool
  55 BSlowMenu::AddDynamicItem(add_state state)
  56 {
  57         if (fMenuBuilt)
  58                 return false;
  59
  60         if (state == B_ABORT) {
  61                 ClearMenuBuildingState();
  62                 return false;
  63         }
  64
  65         if (state == B_INITIAL_ADD && !StartBuildingItemList()) {
  66                 ClearMenuBuildingState();
  67                 return false;
  68         }
  69
  70         bigtime_t timeToBail = system_time() + kMaxTimeBuildingMenu;
  71         for (int32 count = 0; count < kItemsToAddChunk; count++) {
  72                 if (!AddNextItem()) {
  73                         fMenuBuilt = true;
  74                         DoneBuildingItemList();
  75                         ClearMenuBuildingState();
  76                         return false;
  77                                 // done with menu, don't call again
  78                 }
  79
  80                 if (system_time() > timeToBail) {
  81                         // we've been in here long enough, come back later
  82                         break;
  83                 }
  84         }
  85
  86         return true;
  87                 // call me again, got more to show
  88 }
  89
  90
  91 bool
  92 BSlowMenu::StartBuildingItemList()
  93 {
  94         return true;
  95 }
  96
  97
  98 bool
  99 BSlowMenu::AddNextItem()
 100 {
 101         TRESPASS();
 102                 // pure virtual, shouldn't be here
 103         return true;
 104 }
 105
 106
 107 void
 108 BSlowMenu::DoneBuildingItemList()
 109 {
 110         TRESPASS();
 111                 // pure virtual, shouldn't be here
 112 }
 113
 114
 115 void
 116 BSlowMenu::ClearMenuBuildingState()
 117 {
 118         TRESPASS();
 119                 // pure virtual, shouldn't be here
 120 }