more scrollbar input handling: extracted common bits to wxStdScrollBarHandler

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/wxUNIVERSAL@8174 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/univ/inphand.h

@@ -50,4 +50,115 @@ public:
     virtual ~wxInputHandler();
 };
 
+// ============================================================================
+// The classes below provide the standard input handling for some controls so
+// that the code can be reused in different themes. All of these classes chain
+// to an existing input handler (which must be given to the ctor) and so allow
+// custom processing of the events which they don't handle themselves.
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// wxStdInputHandler is just a base class for all other "standard" handlers
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxStdInputHandler : public wxInputHandler
+{
+public:
+    wxStdInputHandler(wxInputHandler *handler) : m_handler(handler) { }
+
+    virtual wxControlActions Map(wxControl *control,
+                                 const wxKeyEvent& event,
+                                 bool pressed)
+        { return m_handler->Map(control, event, pressed); }
+    virtual wxControlActions Map(wxControl *control,
+                                 const wxMouseEvent& event)
+        { return m_handler->Map(control, event); }
+    virtual bool OnMouseMove(wxControl *control, const wxMouseEvent& event)
+        { return m_handler->OnMouseMove(control, event); }
+
+private:
+    wxInputHandler *m_handler;
+};
+
+// ----------------------------------------------------------------------------
+// wxStdButtonInputHandler: translates SPACE and ENTER keys and the left mouse
+// click into button press/release actions
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxStdButtonInputHandler : public wxStdInputHandler
+{
+public:
+    wxStdButtonInputHandler(wxInputHandler *inphand);
+
+    virtual wxControlActions Map(wxControl *control,
+                                 const wxKeyEvent& event,
+                                 bool pressed);
+    virtual wxControlActions Map(wxControl *control,
+                                 const wxMouseEvent& event);
+    virtual bool OnMouseMove(wxControl *control, const wxMouseEvent& event);
+
+private:
+    // the window (button) which has capture or NULL and the flag telling if
+    // the mouse is inside the button which captured it or not
+    wxWindow *m_winCapture;
+    bool      m_winHasMouse;
+};
+
+// ----------------------------------------------------------------------------
+// common scrollbar input handler: it manages clicks on the standard scrollbar
+// elements (line arrows, bar, thumb)
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxStdScrollBarInputHandler : public wxStdInputHandler
+{
+public:
+    // constructor takes a renderer (used for scrollbar hit testing) and the
+    // base handler to which all unhandled events are forwarded
+    wxStdScrollBarInputHandler(wxRenderer *renderer,
+                               wxInputHandler *inphand);
+
+    virtual wxControlActions Map(wxControl *control,
+                                 const wxKeyEvent& event,
+                                 bool pressed);
+    virtual wxControlActions Map(wxControl *control,
+                                 const wxMouseEvent& event);
+    virtual bool OnMouseMove(wxControl *control, const wxMouseEvent& event);
+
+protected:
+    // the methods which must be overridden in the derived class
+
+    // return TRUE to stop scrolling when the mouse leaves the scrollbar (Win32
+    // behaviour) or FALSE to continue (GTK+)
+    virtual bool OnMouseLeave() = 0;
+
+    // return TRUE if the mouse button can be used to activate scrollbar, FALSE
+    // if not (only left mouse button can do it under Windows, any button under
+    // GTK+)
+    virtual bool IsAllowedButton(int button) = 0;
+
+    // set or clear the specified flag on the scrollbar element corresponding
+    // to m_htLast
+    void SetElementState(wxScrollBar *scrollbar, int flag, bool doIt);
+
+    // [un]highlight the scrollbar element corresponding to m_htLast
+    void Highlight(wxScrollBar *scrollbar, bool doIt)
+        { SetElementState(scrollbar, wxCONTROL_CURRENT, doIt); }
+
+    // [un]press the scrollbar element corresponding to m_htLast
+    void Press(wxScrollBar *scrollbar, bool doIt)
+        { SetElementState(scrollbar, wxCONTROL_PRESSED, doIt); }
+
+    // the window (scrollbar) which has capture or NULL and the flag telling if
+    // the mouse is inside the element which captured it or not
+    wxWindow *m_winCapture;
+    bool      m_winHasMouse;
+    int       m_btnCapture;  // the mouse button which has captured mouse
+
+    // one of wxHT_SCROLLBAR_XXX value: where has the mouse been last time?
+    wxHitTest m_htLast;
+
+    // the renderer (we use it only for hit testing)
+    wxRenderer *m_renderer;
+};
+
 #endif // _WX_UNIV_INPHAND_H_