Initialise all variables

[wxWidgets.git] / include / wx / vscroll.h

diff --git a/include/wx/vscroll.h b/include/wx/vscroll.h
index 58b693f1e2e8562f4582f5da274ec1f3ef1732d1..33fc7aa1f89eb31760e4bc0a2ce2a27f2e31fa6a 100644 (file)
--- a/include/wx/vscroll.h
+++ b/include/wx/vscroll.h
@@ -5,7 +5,7 @@
 // Modified by:
 // Created:     30.05.03
 // RCS-ID:      $Id$
-// Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
+// Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwidgets.org>
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
@@ -62,7 +62,7 @@ public:
     // just as with the ctor above, wxVSCROLL style is always used, there is no
     // need to specify it
     bool Create(wxWindow *parent,
-                wxWindowID id,
+                wxWindowID id = wxID_ANY,
                 const wxPoint& pos = wxDefaultPosition,
                 const wxSize& size = wxDefaultSize,
                 long style = 0,
@@ -90,6 +90,21 @@ public:
     virtual bool ScrollLines(int lines);
     virtual bool ScrollPages(int pages);
 
+    // redraw the specified line
+    virtual void RefreshLine(size_t line);
+
+    // redraw all lines in the specified range (inclusive)
+    virtual void RefreshLines(size_t from, size_t to);
+
+    // return the item at the specified (in physical coordinates) position or.
+
+    // wxNOT_FOUND if none, i.e. if it is below the last item
+    int HitTest(wxCoord x, wxCoord y) const;
+    int HitTest(const wxPoint& pt) const { return HitTest(pt.x, pt.y); }
+
+    // recalculate all our parameters and redisplay all lines
+    virtual void RefreshAll();
+
 
     // accessors
     // ---------
@@ -99,13 +114,31 @@ public:
     size_t GetLineCount() const { return m_lineMax; }
 
     // get the first currently visible line
+    size_t GetVisibleBegin() const { return m_lineFirst; }
+
+    // get the first currently visible line
+    size_t GetVisibleEnd() const { return m_lineFirst + m_nVisible; }
+
+    // is this line currently visible?
+    bool IsVisible(size_t line) const
+        { return line >= GetVisibleBegin() && line < GetVisibleEnd(); }
+
+
+    // this is the same as GetVisibleBegin(), exists to match
+    // GetLastVisibleLine() and for backwards compatibility only
     size_t GetFirstVisibleLine() const { return m_lineFirst; }
 
     // get the last currently visible line
-    size_t GetLastVisibleLine() const { return m_lineFirst + m_nVisible - 1; }
+    //
+    // this function is unsafe as it returns (size_t)-1 (i.e. a huge positive
+    // number) if the control is empty, use GetVisibleEnd() instead, this one
+    // is kept for backwards compatibility
+    size_t GetLastVisibleLine() const { return GetVisibleEnd() - 1; }
 
+    // layout the children (including the sizer if needed)
+    virtual bool Layout();
 
-//protected:
+protected:
     // this function must be overridden in the derived class and it should
     // return the height of the given line in pixels
     virtual wxCoord OnGetLineHeight(size_t n) const = 0;
@@ -123,16 +156,30 @@ public:
     //
     // finally note that lineMin is inclusive, while lineMax is exclusive, as
     // usual
-    virtual void OnGetLinesHint(size_t lineMin, size_t lineMax) const { }
+    virtual void OnGetLinesHint(size_t WXUNUSED(lineMin),
+                                size_t WXUNUSED(lineMax)) const { }
+
+    // when the number of lines changes, we try to estimate the total height
+    // of all lines which is a rather expensive operation in terms of lines
+    // access, so if the user code may estimate the average height
+    // better/faster than we do, it should override this function to implement
+    // its own logic
+    //
+    // this function should return the best guess for the total height it may
+    // make
+    virtual wxCoord EstimateTotalHeight() const;
+
 
-protected:
     // the event handlers
     void OnSize(wxSizeEvent& event);
     void OnScroll(wxScrollWinEvent& event);
+#if wxUSE_MOUSEWHEEL
+    void OnMouseWheel(wxMouseEvent& event);
+#endif
 
     // find the index of the line we need to show at the top of the window such
-    // that the last line shown is the given one
-    size_t FindFirstFromBottom(size_t lineLast);
+    // that the last (fully or partially) visible line is the given one
+    size_t FindFirstFromBottom(size_t lineLast, bool fullyVisible = false);
 
     // get the total height of the lines between lineMin (inclusive) and
     // lineMax (exclusive)
@@ -141,6 +188,9 @@ protected:
     // update the thumb size shown by the scrollbar
     void UpdateScrollbar();
 
+    // remove the scrollbar completely because we don't need it
+    void RemoveScrollbar();
+
 private:
     // common part of all ctors
     void Init();
@@ -159,8 +209,14 @@ private:
     // partly, visible one)
     size_t m_nVisible;
 
+    // accumulated mouse wheel rotation
+#if wxUSE_MOUSEWHEEL
+    int m_sumWheelRotation;
+#endif
 
     DECLARE_EVENT_TABLE()
+    DECLARE_NO_COPY_CLASS(wxVScrolledWindow)
+    DECLARE_ABSTRACT_CLASS(wxVScrolledWindow)
 };
 
 #endif // _WX_VSCROLL_H_