include/wx/univ/scrolbar.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/univ/scrolbar.h
   3 // Purpose:     wxScrollBar for wxUniversal
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     20.08.00
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2000 SciTech Software, Inc. (www.scitechsoft.com)
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_UNIV_SCROLBAR_H_
  13 #define _WX_UNIV_SCROLBAR_H_
  14
  15 class WXDLLIMPEXP_FWD_CORE wxScrollTimer;
  16
  17 #include "wx/univ/scrarrow.h"
  18 #include "wx/renderer.h"
  19
  20 // ----------------------------------------------------------------------------
  21 // the actions supported by this control
  22 // ----------------------------------------------------------------------------
  23
  24 // scroll the bar
  25 #define wxACTION_SCROLL_START       _T("start")     // to the beginning
  26 #define wxACTION_SCROLL_END         _T("end")       // to the end
  27 #define wxACTION_SCROLL_LINE_UP     _T("lineup")    // one line up/left
  28 #define wxACTION_SCROLL_PAGE_UP     _T("pageup")    // one page up/left
  29 #define wxACTION_SCROLL_LINE_DOWN   _T("linedown")  // one line down/right
  30 #define wxACTION_SCROLL_PAGE_DOWN   _T("pagedown")  // one page down/right
  31
  32 // the scrollbar thumb may be dragged
  33 #define wxACTION_SCROLL_THUMB_DRAG      _T("thumbdrag")
  34 #define wxACTION_SCROLL_THUMB_MOVE      _T("thumbmove")
  35 #define wxACTION_SCROLL_THUMB_RELEASE   _T("thumbrelease")
  36
  37 // ----------------------------------------------------------------------------
  38 // wxScrollBar
  39 // ----------------------------------------------------------------------------
  40
  41 class WXDLLEXPORT wxScrollBar : public wxScrollBarBase,
  42                                 public wxControlWithArrows
  43 {
  44 public:
  45     // scrollbar elements: they correspond to wxHT_SCROLLBAR_XXX constants but
  46     // start from 0 which allows to use them as array indices
  47     enum Element
  48     {
  49         Element_Arrow_Line_1,
  50         Element_Arrow_Line_2,
  51         Element_Arrow_Page_1,
  52         Element_Arrow_Page_2,
  53         Element_Thumb,
  54         Element_Bar_1,
  55         Element_Bar_2,
  56         Element_Max
  57     };
  58
  59     wxScrollBar();
  60     wxScrollBar(wxWindow *parent,
  61                 wxWindowID id,
  62                 const wxPoint& pos = wxDefaultPosition,
  63                 const wxSize& size = wxDefaultSize,
  64                 long style = wxSB_HORIZONTAL,
  65                 const wxValidator& validator = wxDefaultValidator,
  66                 const wxString& name = wxScrollBarNameStr);
  67
  68     bool Create(wxWindow *parent,
  69                 wxWindowID id,
  70                 const wxPoint& pos = wxDefaultPosition,
  71                 const wxSize& size = wxDefaultSize,
  72                 long style = wxSB_HORIZONTAL,
  73                 const wxValidator& validator = wxDefaultValidator,
  74                 const wxString& name = wxScrollBarNameStr);
  75
  76     virtual ~wxScrollBar();
  77
  78     // implement base class pure virtuals
  79     virtual int GetThumbPosition() const;
  80     virtual int GetThumbSize() const;
  81     virtual int GetPageSize() const;
  82     virtual int GetRange() const;
  83
  84     virtual void SetThumbPosition(int thumbPos);
  85     virtual void SetScrollbar(int position, int thumbSize,
  86                               int range, int pageSize,
  87                               bool refresh = true);
  88
  89     // wxScrollBar actions
  90     void ScrollToStart();
  91     void ScrollToEnd();
  92     bool ScrollLines(int nLines);
  93     bool ScrollPages(int nPages);
  94
  95     virtual bool PerformAction(const wxControlAction& action,
  96                                long numArg = 0,
  97                                const wxString& strArg = wxEmptyString);
  98
  99     static wxInputHandler *GetStdInputHandler(wxInputHandler *handlerDef);
 100     virtual wxInputHandler *DoGetStdInputHandler(wxInputHandler *handlerDef)
 101     {
 102         return GetStdInputHandler(handlerDef);
 103     }
 104
 105     // scrollbars around a normal window should not receive the focus
 106     virtual bool AcceptsFocus() const;
 107
 108     // wxScrollBar sub elements state (combination of wxCONTROL_XXX)
 109     void SetState(Element which, int flags);
 110     int GetState(Element which) const;
 111
 112     // implement wxControlWithArrows methods
 113     virtual wxRenderer *GetRenderer() const { return m_renderer; }
 114     virtual wxWindow *GetWindow() { return this; }
 115     virtual bool IsVertical() const { return wxScrollBarBase::IsVertical(); }
 116     virtual int GetArrowState(wxScrollArrows::Arrow arrow) const;
 117     virtual void SetArrowFlag(wxScrollArrows::Arrow arrow, int flag, bool set);
 118     virtual bool OnArrow(wxScrollArrows::Arrow arrow);
 119     virtual wxScrollArrows::Arrow HitTestArrow(const wxPoint& pt) const;
 120
 121     // for wxControlRenderer::DrawScrollbar() only
 122     const wxScrollArrows& GetArrows() const { return m_arrows; }
 123
 124     // returns one of wxHT_SCROLLBAR_XXX constants
 125     wxHitTest HitTestBar(const wxPoint& pt) const;
 126
 127     // idle processing
 128     virtual void OnInternalIdle();
 129
 130 protected:
 131     virtual wxSize DoGetBestClientSize() const;
 132     virtual void DoDraw(wxControlRenderer *renderer);
 133     virtual wxBorder GetDefaultBorder() const { return wxBORDER_NONE; }
 134
 135     // forces update of thumb's visual appearence (does nothing if m_dirty=false)
 136     void UpdateThumb();
 137
 138     // SetThumbPosition() helper
 139     void DoSetThumb(int thumbPos);
 140
 141     // common part of all ctors
 142     void Init();
 143
 144     // is this scrollbar attached to a window or a standalone control?
 145     bool IsStandalone() const;
 146
 147     // scrollbar geometry methods:
 148
 149     // gets the bounding box for a scrollbar element for the given (by default
 150     // - current) thumb position
 151     wxRect GetScrollbarRect(wxScrollBar::Element elem, int thumbPos = -1) const;
 152
 153     // returns the size of the scrollbar shaft excluding the arrows
 154     wxCoord GetScrollbarSize() const;
 155
 156     // translate the scrollbar position (in logical units) into physical
 157     // coordinate (in pixels) and the other way round
 158     wxCoord ScrollbarToPixel(int thumbPos = -1);
 159     int PixelToScrollbar(wxCoord coord);
 160
 161     // return the starting and ending positions, in pixels, of the thumb of a
 162     // scrollbar with the given logical position, thumb size and range and the
 163     // given physical length
 164     static void GetScrollBarThumbSize(wxCoord length,
 165                                       int thumbPos,
 166                                       int thumbSize,
 167                                       int range,
 168                                       wxCoord *thumbStart,
 169                                       wxCoord *thumbEnd);
 170
 171 private:
 172     // total range of the scrollbar in logical units
 173     int m_range;
 174
 175     // the current and previous (after last refresh - this is used for
 176     // repainting optimisation) size of the thumb in logical units (from 0 to
 177     // m_range) and its position (from 0 to m_range - m_thumbSize)
 178     int m_thumbSize,
 179         m_thumbPos,
 180         m_thumbPosOld;
 181
 182     // the page size, i.e. the number of lines by which to scroll when page
 183     // up/down action is performed
 184     int m_pageSize;
 185
 186     // the state of the sub elements
 187     int m_elementsState[Element_Max];
 188
 189     // the dirty flag: if set, scrollbar must be updated
 190     bool m_dirty;
 191
 192     // the object handling the arrows
 193     wxScrollArrows m_arrows;
 194
 195     friend WXDLLEXPORT class wxControlRenderer; // for geometry methods
 196     friend class wxStdScrollBarInputHandler; // for geometry methods
 197
 198     DECLARE_EVENT_TABLE()
 199     DECLARE_DYNAMIC_CLASS(wxScrollBar)
 200 };
 201
 202 // ----------------------------------------------------------------------------
 203 // Standard scrollbar input handler which can be used as a base class
 204 // ----------------------------------------------------------------------------
 205
 206 class WXDLLEXPORT wxStdScrollBarInputHandler : public wxStdInputHandler
 207 {
 208 public:
 209     // constructor takes a renderer (used for scrollbar hit testing) and the
 210     // base handler to which all unhandled events are forwarded
 211     wxStdScrollBarInputHandler(wxRenderer *renderer,
 212                                wxInputHandler *inphand);
 213
 214     virtual bool HandleKey(wxInputConsumer *consumer,
 215                            const wxKeyEvent& event,
 216                            bool pressed);
 217     virtual bool HandleMouse(wxInputConsumer *consumer,
 218                              const wxMouseEvent& event);
 219     virtual bool HandleMouseMove(wxInputConsumer *consumer, const wxMouseEvent& event);
 220
 221     virtual ~wxStdScrollBarInputHandler();
 222
 223     // this method is called by wxScrollBarTimer only and may be overridden
 224     //
 225     // return true to continue scrolling, false to stop the timer
 226     virtual bool OnScrollTimer(wxScrollBar *scrollbar,
 227                                const wxControlAction& action);
 228
 229 protected:
 230     // return true if the mouse button can be used to activate scrollbar, false
 231     // if not (any button under GTK+ unlike left button only which is default)
 232     virtual bool IsAllowedButton(int button) const
 233         { return button == wxMOUSE_BTN_LEFT; }
 234
 235     // set or clear the specified flag on the scrollbar element corresponding
 236     // to m_htLast
 237     void SetElementState(wxScrollBar *scrollbar, int flag, bool doIt);
 238
 239     // [un]highlight the scrollbar element corresponding to m_htLast
 240     virtual void Highlight(wxScrollBar *scrollbar, bool doIt)
 241         { SetElementState(scrollbar, wxCONTROL_CURRENT, doIt); }
 242
 243     // [un]press the scrollbar element corresponding to m_htLast
 244     virtual void Press(wxScrollBar *scrollbar, bool doIt)
 245         { SetElementState(scrollbar, wxCONTROL_PRESSED, doIt); }
 246
 247     // stop scrolling because we reached the end point
 248     void StopScrolling(wxScrollBar *scrollbar);
 249
 250     // get the mouse coordinates in the scrollbar direction from the event
 251     wxCoord GetMouseCoord(const wxScrollBar *scrollbar,
 252                           const wxMouseEvent& event) const;
 253
 254     // generate a "thumb move" action for this mouse event
 255     void HandleThumbMove(wxScrollBar *scrollbar, const wxMouseEvent& event);
 256
 257
 258     // the window (scrollbar) which has capture or NULL and the flag telling if
 259     // the mouse is inside the element which captured it or not
 260     wxWindow *m_winCapture;
 261     bool      m_winHasMouse;
 262     int       m_btnCapture;  // the mouse button which has captured mouse
 263
 264     // the position where we started scrolling by page
 265     wxPoint m_ptStartScrolling;
 266
 267     // one of wxHT_SCROLLBAR_XXX value: where has the mouse been last time?
 268     wxHitTest m_htLast;
 269
 270     // the renderer (we use it only for hit testing)
 271     wxRenderer *m_renderer;
 272
 273     // the offset of the top/left of the scrollbar relative to the mouse to
 274     // keep during the thumb drag
 275     int m_ofsMouse;
 276
 277     // the timer for generating scroll events when the mouse stays pressed on
 278     // a scrollbar
 279     wxScrollTimer *m_timerScroll;
 280 };
 281
 282 #endif // _WX_UNIV_SCROLBAR_H_
 283