src/kits/tracker/SlowMenu.h

   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 #ifndef _SLOW_MENU_H
  35 #define _SLOW_MENU_H
  36
  37
  38 // SlowMenu is a convenience class that makes it easier to
  39 // use the AddDynamicItem callback to implement a menu that can
  40 // checks periodically between creating new items and quits
  41 // early if needed
  42
  43
  44 #include <Menu.h>
  45 #include <MenuItem.h>
  46 #include <Debug.h>
  47
  48
  49 namespace BPrivate {
  50
  51 class BSlowMenu : public BMenu {
  52 public:
  53         BSlowMenu(const char* title, menu_layout layout = B_ITEMS_IN_COLUMN);
  54
  55 protected:
  56         virtual bool StartBuildingItemList();
  57                 // set up state to start building the item list
  58                 // returns false if setup failed
  59         virtual bool AddNextItem() = 0;
  60                 // returns false if done
  61         virtual void DoneBuildingItemList() = 0;
  62                 // default version adds items from itemList to menu and deletes
  63                 // the list; override to sort items first, etc.
  64
  65         virtual void ClearMenuBuildingState() = 0;
  66
  67 protected:
  68         virtual bool AddDynamicItem(add_state state);
  69                 // this is the callback from BMenu, you shouldn't need to
  70                 // override this
  71
  72         bool fMenuBuilt;
  73 };
  74
  75 } // namespace BPrivate
  76
  77 using namespace BPrivate;
  78
  79
  80 #endif  // _SLOW_MENU_H