removed useless spaces

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51911 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/doxygen/overviews/bookctrl.h

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 /////////////////////////////////////////////////////////////////////////////
 
 /*!
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  @page bookctrl_overview wxBookCtrl overview
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  Classes: #wxNotebook, #wxListbook, #wxChoicebook,
  #wxTreebook, #wxToolbook
  #Introduction
  @ref bestbookctrl_overview
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  @section wxbookctrlintro Introduction
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  A book control is a convenient way of displaying multiple pages of information,
  displayed one page at a time. wxWidgets has five variants of this control:
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   #wxNotebook: uses a row of tabs
   #wxListbook: controlled by a #wxListCtrl
   #wxChoicebook: controlled by a #wxChoice
   #wxTreebook: controlled by a #wxTreeCtrl
   #wxToolbook: controlled by a #wxToolBar
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  See @ref samplenotebook_overview for an example of wxBookCtrl usage.
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  @section wxbestbookctrl Best book
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  wxBookCtrl is mapped to the class best suited for a given platform.
  Currently it provides #wxChoicebook for smartphones equipped with
  WinCE, and #wxNotebook for all other platforms. The mapping consists of:
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  wxBookCtrl
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  wxChoicebook or wxNotebook
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  wxBookCtrlEvent
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  wxChoicebookEvent or wxNotebookEvent
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  wxEVT_COMMAND_BOOKCTRL_PAGE_CHANGED
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  wxEVT_COMMAND_CHOICEBOOK_PAGE_CHANGED or wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED
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  wxEVT_COMMAND_BOOKCTRL_PAGE_CHANGING
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  wxEVT_COMMAND_CHOICEBOOK_PAGE_CHANGING or wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGING
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  EVT_BOOKCTRL_PAGE_CHANGED(id, fn)
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  EVT_CHOICEBOOK_PAGE_CHANGED(id, fn) or EVT_NOTEBOOK_PAGE_CHANGED(id, fn)
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  EVT_BOOKCTRL_PAGE_CHANGING(id, fn)
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  EVT_CHOICEBOOK_PAGE_CHANGING(id, fn) or EVT_NOTEBOOK_PAGE_CHANGING(id, fn)
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  For orientation of the book controller, use following flags in style:
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  @b wxBK_TOP
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  controller above pages
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  @b wxBK_BOTTOM
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  controller below pages
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  @b wxBK_LEFT
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  controller on the left
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  @b wxBK_RIGHT
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  controller on the right
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  @b wxBK_DEFAULT
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  native controller placement
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  */
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