Add virtual keyword where applicable.

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

diff --git a/include/wx/vscroll.h b/include/wx/vscroll.h
index cc500db1a912b009cd869b1eccddc463d6171157..33fc7aa1f89eb31760e4bc0a2ce2a27f2e31fa6a 100644 (file)
--- a/include/wx/vscroll.h
+++ b/include/wx/vscroll.h
@@ -12,10 +12,6 @@
 #ifndef _WX_VSCROLL_H_
 #define _WX_VSCROLL_H_
 
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma interface "vscroll.h"
-#endif
-
 #include "wx/panel.h"           // base class
 
 // ----------------------------------------------------------------------------
@@ -118,15 +114,29 @@ public:
     size_t GetLineCount() const { return m_lineMax; }
 
     // get the first currently visible line
-    size_t GetFirstVisibleLine() const { return m_lineFirst; }
+    size_t GetVisibleBegin() const { return m_lineFirst; }
 
-    // get the last currently visible line
-    size_t GetLastVisibleLine() const { return m_lineFirst + m_nVisible - 1; }
+    // 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 >= m_lineFirst && line <= GetLastVisibleLine(); }
+        { 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
+    //
+    // 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:
     // this function must be overridden in the derived class and it should
@@ -178,6 +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();