include/wx/univ/scrarrow.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/univ/scrarrow.h
   3 // Purpose:     wxScrollArrows class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     22.01.01
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2001 SciTech Software, Inc. (www.scitechsoft.com)
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_UNIV_SCRARROW_H_
  13 #define _WX_UNIV_SCRARROW_H_
  14
  15 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  16     #pragma interface "univscrarrow.h"
  17 #endif
  18
  19 // ----------------------------------------------------------------------------
  20 // wxScrollArrows is not a control but just a class containing the common
  21 // functionality of scroll arrows, whether part of scrollbars, spin ctrls or
  22 // anything else.
  23 //
  24 // To customize its behaviour, wxScrollArrows doesn't use any virtual methods
  25 // but instead a callback pointer to a wxControlWithArrows object which is used
  26 // for all control-dependent stuff. Thus, to use wxScrollArrows, you just need
  27 // to derive from the wxControlWithArrows interface and implement its methods.
  28 // ----------------------------------------------------------------------------
  29
  30 class WXDLLEXPORT wxControlWithArrows;
  31 class WXDLLEXPORT wxDC;
  32 class WXDLLEXPORT wxMouseEvent;
  33 class WXDLLEXPORT wxRect;
  34 class WXDLLEXPORT wxRenderer;
  35
  36 // ----------------------------------------------------------------------------
  37 // wxScrollArrows: an abstraction of scrollbar arrow
  38 // ----------------------------------------------------------------------------
  39
  40 class WXDLLEXPORT wxScrollArrows
  41 {
  42 public:
  43     enum Arrow
  44     {
  45         Arrow_None = -1,
  46         Arrow_First,        // left or top
  47         Arrow_Second,       // right or bottom
  48         Arrow_Max
  49     };
  50
  51     // ctor requires a back pointer to wxControlWithArrows
  52     wxScrollArrows(wxControlWithArrows *control);
  53
  54     // draws the arrow on the given DC in the given rectangle, uses
  55     // wxControlWithArrows::GetArrowState() to get its current state
  56     void DrawArrow(Arrow arrow, wxDC& dc, const wxRect& rect,
  57                    bool scrollbarLike = false) const;
  58
  59     // process a mouse move, enter or leave event, possibly calling
  60     // wxControlWithArrows::SetArrowState() if wxControlWithArrows::HitTest()
  61     // says that the mosue has left/entered an arrow
  62     bool HandleMouseMove(const wxMouseEvent& event) const;
  63
  64     // process a mouse click event
  65     bool HandleMouse(const wxMouseEvent& event) const;
  66
  67     // dtor
  68     ~wxScrollArrows();
  69
  70 private:
  71     // set or clear the wxCONTROL_CURRENT flag for the arrow
  72     void UpdateCurrentFlag(Arrow arrow, Arrow arrowCur) const;
  73
  74     // the main control
  75     wxControlWithArrows *m_control;
  76
  77     // the data for the mouse capture
  78     struct wxScrollArrowCaptureData *m_captureData;
  79 };
  80
  81 // ----------------------------------------------------------------------------
  82 // wxControlWithArrows: interface implemented by controls using wxScrollArrows
  83 // ----------------------------------------------------------------------------
  84
  85 class WXDLLEXPORT wxControlWithArrows
  86 {
  87 public:
  88     // get the renderer to use for drawing the arrows
  89     virtual wxRenderer *GetRenderer() const = 0;
  90
  91     // get the controls window (used for mouse capturing)
  92     virtual wxWindow *GetWindow() = 0;
  93
  94     // get the orientation of the arrows (vertical or horizontal)
  95     virtual bool IsVertical() const = 0;
  96
  97     // get the state of this arrow as combination of wxCONTROL_XXX flags
  98     virtual int GetArrowState(wxScrollArrows::Arrow arrow) const = 0;
  99
 100     // set or clear the specified flag in the arrow state: this function is
 101     // responsible for refreshing the control
 102     virtual void SetArrowFlag(wxScrollArrows::Arrow arrow,
 103                               int flag, bool set = true) = 0;
 104
 105     // hit testing: return on which arrow the point is (or Arrow_None)
 106     virtual wxScrollArrows::Arrow HitTest(const wxPoint& pt) const = 0;
 107
 108     // called when the arrow is pressed, return true to continue scrolling and
 109     // false to stop it
 110     virtual bool OnArrow(wxScrollArrows::Arrow arrow) = 0;
 111 };
 112
 113 #endif // _WX_UNIV_SCRARROW_H_