Initial work on virtual file system support for the WebKitGTK+ backend. It now suppor...

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

diff --git a/include/wx/scrolwin.h b/include/wx/scrolwin.h
index 9464b6973d432c893f3684a0883bde895fd387b6..6360fd721b1d5d45e82c2aac06055ce9c0fb755f 100644 (file)
--- a/include/wx/scrolwin.h
+++ b/include/wx/scrolwin.h
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        include/wx/scrolwin.h
+// Name:        wx/scrolwin.h

 // Purpose:     wxScrolledWindow, wxScrolledControl and wxScrollHelper
 // Author:      Vadim Zeitlin
 // Modified by:
 // Purpose:     wxScrolledWindow, wxScrolledControl and wxScrollHelper
 // Author:      Vadim Zeitlin
 // Modified by:


@@ -12,53 +12,122 @@
 #ifndef _WX_SCROLWIN_H_BASE_
 #define _WX_SCROLWIN_H_BASE_
 
 #ifndef _WX_SCROLWIN_H_BASE_
 #define _WX_SCROLWIN_H_BASE_
 

-#include "wx/window.h"
+#include "wx/panel.h"

 
 

-class WXDLLEXPORT wxTimer;
+class WXDLLIMPEXP_FWD_CORE wxScrollHelperEvtHandler;
+class WXDLLIMPEXP_FWD_BASE wxTimer;
+
+// default scrolled window style: scroll in both directions
+#define wxScrolledWindowStyle (wxHSCROLL | wxVSCROLL)
+
+// values for the second argument of wxScrollHelper::ShowScrollbars()
+enum wxScrollbarVisibility
+{
+    wxSHOW_SB_NEVER = -1,   // never show the scrollbar at all
+    wxSHOW_SB_DEFAULT,      // show scrollbar only if it is needed
+    wxSHOW_SB_ALWAYS        // always show scrollbar, even if not needed
+};

 
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------

-// wxScrollHelper: this class implements the scrolling logic which is used by
-// wxScrolledWindow and wxScrolledControl. It is a mix-in: just derive from it
-// to implement scrolling in your class.
+// The hierarchy of scrolling classes is a bit complicated because we want to
+// put as much functionality as possible in a mix-in class not deriving from
+// wxWindow so that other classes could derive from the same base class on all
+// platforms irrespectively of whether they are native controls (and hence
+// don't use our scrolling) or not.
+//
+// So we have
+//
+//                           wxScrollHelperBase
+//                                   |
+//                                   |
+//                                  \|/
+//      wxWindow               wxScrollHelper
+//       |  \                   /        /
+//       |   \                 /        /
+//       |    _|             |_        /
+//       |     wxScrolledWindow       /
+//       |                           /
+//      \|/                         /
+//   wxControl                     /
+//         \                      /
+//          \                    /
+//           _|                |_
+//            wxScrolledControl
+//

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-class WXDLLEXPORT wxScrollHelper
+class WXDLLIMPEXP_CORE wxScrollHelperBase

 {
 public:
 {
 public:

-    // ctor and dtor
-    wxScrollHelper(wxWindow *winToScroll = (wxWindow *)NULL);
-    void SetWindow(wxWindow *winToScroll);
-    virtual ~wxScrollHelper();
+    // ctor must be given the associated window
+    wxScrollHelperBase(wxWindow *winToScroll);
+    virtual ~wxScrollHelperBase();

 
     // configure the scrolling
     virtual void SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
                                int noUnitsX, int noUnitsY,
                                int xPos = 0, int yPos = 0,
 
     // configure the scrolling
     virtual void SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
                                int noUnitsX, int noUnitsY,
                                int xPos = 0, int yPos = 0,

-                               bool noRefresh = FALSE );
+                               bool noRefresh = false );

 
     // scroll to the given (in logical coords) position
 
     // scroll to the given (in logical coords) position

-    virtual void Scroll(int x, int y);
+    //
+    // notice that for backwards compatibility reasons Scroll() is virtual as
+    // the existing code could override it but new code should override
+    // DoScroll() instead
+    virtual void Scroll(int x, int y) { DoScroll(x, y); }
+    virtual void Scroll(const wxPoint& pt) { DoScroll(pt.x, pt.y); }

 
     // get/set the page size for this orientation (wxVERTICAL/wxHORIZONTAL)
     int GetScrollPageSize(int orient) const;
     void SetScrollPageSize(int orient, int pageSize);
 
 
     // get/set the page size for this orientation (wxVERTICAL/wxHORIZONTAL)
     int GetScrollPageSize(int orient) const;
     void SetScrollPageSize(int orient, int pageSize);
 

+    // get the number of lines the window can scroll,
+    // returns 0 if no scrollbars are there.
+    int GetScrollLines( int orient ) const;
+
+    // Set the x, y scrolling increments.
+    void SetScrollRate( int xstep, int ystep );
+

     // get the size of one logical unit in physical ones
     // get the size of one logical unit in physical ones

-    virtual void GetScrollPixelsPerUnit(int *pixelsPerUnitX,
-                                        int *pixelsPerUnitY) const;
+    void GetScrollPixelsPerUnit(int *pixelsPerUnitX, int *pixelsPerUnitY) const;
+
+    // Set scrollbar visibility: it is possible to show scrollbar only if it is
+    // needed (i.e. if our virtual size is greater than the current size of the
+    // associated window), always (as wxALWAYS_SHOW_SB style does) or never (in
+    // which case you should provide some other way to scroll the window as the
+    // user wouldn't be able to do it at all)
+    void ShowScrollbars(wxScrollbarVisibility horz, wxScrollbarVisibility vert)
+    {
+        DoShowScrollbars(horz, vert);
+    }

 
 

-    // Enable/disable Windows scrolling in either direction. If TRUE, wxWindows
+    // Enable/disable Windows scrolling in either direction. If true, wxWidgets

     // scrolls the canvas and only a bit of the canvas is invalidated; no
     // scrolls the canvas and only a bit of the canvas is invalidated; no

-    // Clear() is necessary. If FALSE, the whole canvas is invalidated and a
+    // Clear() is necessary. If false, the whole canvas is invalidated and a

     // Clear() is necessary. Disable for when the scroll increment is used to
     // actually scroll a non-constant distance
     virtual void EnableScrolling(bool x_scrolling, bool y_scrolling);
 
     // Clear() is necessary. Disable for when the scroll increment is used to
     // actually scroll a non-constant distance
     virtual void EnableScrolling(bool x_scrolling, bool y_scrolling);
 

+    // Disable use of keyboard keys for scrolling. By default cursor movement
+    // keys (including Home, End, Page Up and Down) are used to scroll the
+    // window appropriately. If the derived class uses these keys for something
+    // else, e.g. changing the currently selected item, this function can be
+    // used to disable this behaviour as it's not only not necessary then but
+    // can actually be actively harmful if another object forwards a keyboard
+    // event corresponding to one of the above keys to us using
+    // ProcessWindowEvent() because the event will always be processed which
+    // can be undesirable.
+    void DisableKeyboardScrolling() { m_kbdScrollingEnabled = false; }
+

     // Get the view start
     // Get the view start

-    virtual void GetViewStart(int *x, int *y) const;
+    void GetViewStart(int *x, int *y) const { DoGetViewStart(x, y); }

 
 

-    // Actual size in pixels when scrolling is taken into account
-    virtual void GetVirtualSize(int *x, int *y) const;
+    wxPoint GetViewStart() const
+    {
+        wxPoint pt;
+        DoGetViewStart(&pt.x, &pt.y);
+        return pt;
+    }

 
     // Set the scale factor, used in PrepareDC
     void SetScale(double xs, double ys) { m_scaleX = xs; m_scaleY = ys; }
 
     // Set the scale factor, used in PrepareDC
     void SetScale(double xs, double ys) { m_scaleX = xs; m_scaleY = ys; }


@@ -66,21 +135,39 @@ public:
     double GetScaleY() const { return m_scaleY; }
 
     // translate between scrolled and unscrolled coordinates
     double GetScaleY() const { return m_scaleY; }
 
     // translate between scrolled and unscrolled coordinates

-    virtual void CalcScrolledPosition(int x, int y, int *xx, int *yy) const;
-    virtual void CalcUnscrolledPosition(int x, int y, int *xx, int *yy) const;
+    void CalcScrolledPosition(int x, int y, int *xx, int *yy) const
+        {  DoCalcScrolledPosition(x, y, xx, yy); }
+    wxPoint CalcScrolledPosition(const wxPoint& pt) const
+    {
+        wxPoint p2;
+        DoCalcScrolledPosition(pt.x, pt.y, &p2.x, &p2.y);
+        return p2;
+    }
+
+    void CalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
+        {  DoCalcUnscrolledPosition(x, y, xx, yy); }
+    wxPoint CalcUnscrolledPosition(const wxPoint& pt) const
+    {
+        wxPoint p2;
+        DoCalcUnscrolledPosition(pt.x, pt.y, &p2.x, &p2.y);
+        return p2;
+    }
+
+    void DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const;
+    void DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const;

 
     // Adjust the scrollbars
 
     // Adjust the scrollbars

-    virtual void AdjustScrollbars(void);
+    virtual void AdjustScrollbars() = 0;

 
     // Calculate scroll increment
 
     // Calculate scroll increment

-    virtual int CalcScrollInc(wxScrollWinEvent& event);
+    int CalcScrollInc(wxScrollWinEvent& event);

 
     // Normally the wxScrolledWindow will scroll itself, but in some rare
     // occasions you might want it to scroll [part of] another window (e.g. a
     // child of it in order to scroll only a portion the area between the
     // scrollbars (spreadsheet: only cell area will move).
 
     // Normally the wxScrolledWindow will scroll itself, but in some rare
     // occasions you might want it to scroll [part of] another window (e.g. a
     // child of it in order to scroll only a portion the area between the
     // scrollbars (spreadsheet: only cell area will move).

-    virtual void SetTargetWindow(wxWindow *target);
-    virtual wxWindow *GetTargetWindow() const;
+    void SetTargetWindow(wxWindow *target);
+    wxWindow *GetTargetWindow() const;

 
     void SetTargetRect(const wxRect& rect) { m_rectToScroll = rect; }
     wxRect GetTargetRect() const { return m_rectToScroll; }
 
     void SetTargetRect(const wxRect& rect) { m_rectToScroll = rect; }
     wxRect GetTargetRect() const { return m_rectToScroll; }


@@ -102,7 +189,7 @@ public:
     // stop the timer, so it will be called repeatedly and will typically
     // return different values depending on the current mouse position
     //
     // stop the timer, so it will be called repeatedly and will typically
     // return different values depending on the current mouse position
     //

-    // the base class version just returns TRUE
+    // the base class version just returns true

     virtual bool SendAutoScrollEvents(wxScrollWinEvent& event) const;
 
     // the methods to be called from the window event handlers
     virtual bool SendAutoScrollEvents(wxScrollWinEvent& event) const;
 
     // the methods to be called from the window event handlers


@@ -115,10 +202,17 @@ public:
 #if wxUSE_MOUSEWHEEL
     void HandleOnMouseWheel(wxMouseEvent& event);
 #endif // wxUSE_MOUSEWHEEL
 #if wxUSE_MOUSEWHEEL
     void HandleOnMouseWheel(wxMouseEvent& event);
 #endif // wxUSE_MOUSEWHEEL

+    void HandleOnChildFocus(wxChildFocusEvent& event);
+
+#if WXWIN_COMPATIBILITY_2_8
+    wxDEPRECATED(
+        void OnScroll(wxScrollWinEvent& event) { HandleOnScroll(event); }
+    )
+#endif // WXWIN_COMPATIBILITY_2_8

 
 protected:
     // get pointer to our scroll rect if we use it or NULL
 
 protected:
     // get pointer to our scroll rect if we use it or NULL

-    const wxRect *GetRect() const
+    const wxRect *GetScrollRect() const

     {
         return m_rectToScroll.width != 0 ? &m_rectToScroll : NULL;
     }
     {
         return m_rectToScroll.width != 0 ? &m_rectToScroll : NULL;
     }


@@ -130,7 +224,7 @@ protected:
                                          : m_targetWindow->GetClientSize();
     }
 
                                          : m_targetWindow->GetClientSize();
     }
 

-    void GetTargetSize(int *w, int *h)
+    void GetTargetSize(int *w, int *h) const

     {
         wxSize size = GetTargetSize();
         if ( w )
     {
         wxSize size = GetTargetSize();
         if ( w )


@@ -139,6 +233,49 @@ protected:
             *h = size.y;
     }
 
             *h = size.y;
     }
 

+    // implementation of public methods with the same name
+    virtual void DoGetViewStart(int *x, int *y) const;
+    virtual void DoScroll(int x, int y) = 0;
+    virtual void DoShowScrollbars(wxScrollbarVisibility horz,
+                                  wxScrollbarVisibility vert) = 0;
+
+    // implementations of various wxWindow virtual methods which should be
+    // forwarded to us (this can be done by WX_FORWARD_TO_SCROLL_HELPER())
+    bool ScrollLayout();
+    void ScrollDoSetVirtualSize(int x, int y);
+    wxSize ScrollGetBestVirtualSize() const;
+
+    // change just the target window (unlike SetWindow which changes m_win as
+    // well)
+    void DoSetTargetWindow(wxWindow *target);
+
+    // delete the event handler we installed
+    void DeleteEvtHandler();
+
+    // calls wxScrollHelperEvtHandler::ResetDrawnFlag(), see explanation
+    // in wxScrollHelperEvtHandler::ProcessEvent()
+    void ResetDrawnFlag();
+
+    // this function should be overridden to return the size available for
+    // m_targetWindow inside m_win of the given size
+    //
+    // the default implementation is only good for m_targetWindow == m_win
+    // case, if we're scrolling a subwindow you must override this method
+    virtual wxSize GetSizeAvailableForScrollTarget(const wxSize& size)
+    {
+        // returning just size from here is wrong but it was decided that it is
+        // not wrong enough to break the existing code (which doesn't override
+        // this recently added function at all) by adding this assert
+        //
+        // wxASSERT_MSG( m_targetWindow == m_win, "must be overridden" );
+
+        return size;
+    }
+
+
+    double                m_scaleX;
+    double                m_scaleY;
+

     wxWindow             *m_win,
                          *m_targetWindow;
 
     wxWindow             *m_win,
                          *m_targetWindow;
 


@@ -158,43 +295,163 @@ protected:
     bool                  m_xScrollingEnabled;
     bool                  m_yScrollingEnabled;
 
     bool                  m_xScrollingEnabled;
     bool                  m_yScrollingEnabled;
 

-    double                m_scaleX;
-    double                m_scaleY;
+    bool                  m_kbdScrollingEnabled;

 
 #if wxUSE_MOUSEWHEEL
     int m_wheelRotation;
 #endif // wxUSE_MOUSEWHEEL
 
 #if wxUSE_MOUSEWHEEL
     int m_wheelRotation;
 #endif // wxUSE_MOUSEWHEEL

+
+    wxScrollHelperEvtHandler *m_handler;
+
+    wxDECLARE_NO_COPY_CLASS(wxScrollHelperBase);

 };
 
 };
 

+// this macro can be used in a wxScrollHelper-derived class to forward wxWindow
+// methods to corresponding wxScrollHelper methods
+#define WX_FORWARD_TO_SCROLL_HELPER()                                         \
+public:                                                                       \
+    virtual void PrepareDC(wxDC& dc) { DoPrepareDC(dc); }                     \
+    virtual bool Layout() { return ScrollLayout(); }                          \
+    virtual void DoSetVirtualSize(int x, int y)                               \
+        { ScrollDoSetVirtualSize(x, y); }                                     \
+    virtual wxSize GetBestVirtualSize() const                                 \
+        { return ScrollGetBestVirtualSize(); }
+
+// include the declaration of the real wxScrollHelper
+#if defined(__WXGTK20__) && !defined(__WXUNIVERSAL__)
+    #include "wx/gtk/scrolwin.h"
+#elif defined(__WXGTK__) && !defined(__WXUNIVERSAL__)
+    #include "wx/gtk1/scrolwin.h"
+#else
+    #define wxHAS_GENERIC_SCROLLWIN
+    #include "wx/generic/scrolwin.h"
+#endif
+

 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------

-// wxScrolledWindow: a wxWindow which knows how to scroll
+// wxScrolled<T>: a wxWindow which knows how to scroll

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-#ifdef __WXGTK__
-    #include "wx/gtk/scrolwin.h"
-#else // !wxGTK
-    #include "wx/generic/scrolwin.h"
+// helper class for wxScrolled<T> below
+struct WXDLLIMPEXP_CORE wxScrolledT_Helper
+{
+    static wxSize FilterBestSize(const wxWindow *win,
+                                 const wxScrollHelper *helper,
+                                 const wxSize& origBest);
+#ifdef __WXMSW__
+    static WXLRESULT FilterMSWWindowProc(WXUINT nMsg, WXLRESULT origResult);
+#endif
+};
+
+// Scrollable window base on window type T. This used to be wxScrolledWindow,
+// but wxScrolledWindow includes wxControlContainer functionality and that's
+// not always desirable.
+template<class T>
+class wxScrolled : public T,
+                   public wxScrollHelper,
+                   private wxScrolledT_Helper
+{
+public:
+    wxScrolled() : wxScrollHelper(this) { }
+    wxScrolled(wxWindow *parent,
+               wxWindowID winid = wxID_ANY,
+               const wxPoint& pos = wxDefaultPosition,
+               const wxSize& size = wxDefaultSize,
+               long style = wxScrolledWindowStyle,
+               const wxString& name = wxPanelNameStr)
+        : wxScrollHelper(this)
+    {
+        Create(parent, winid, pos, size, style, name);
+    }

 
 

-    class WXDLLEXPORT wxScrolledWindow : public wxGenericScrolledWindow
+    bool Create(wxWindow *parent,
+                wxWindowID winid,
+                const wxPoint& pos = wxDefaultPosition,
+                const wxSize& size = wxDefaultSize,
+                long style = wxScrolledWindowStyle,
+                const wxString& name = wxPanelNameStr)

     {
     {

-    public:
-        wxScrolledWindow() { }
-        wxScrolledWindow(wxWindow *parent,
-                         wxWindowID id = -1,
-                         const wxPoint& pos = wxDefaultPosition,
-                         const wxSize& size = wxDefaultSize,
-                         long style = wxScrolledWindowStyle,
-                         const wxString& name = wxPanelNameStr)
-            : wxGenericScrolledWindow(parent, id, pos, size, style, name)
-        {
-        }
-
-    private:
-        DECLARE_CLASS(wxScrolledWindow)
-    };
-
-    #define wxSCROLLED_WINDOW_IS_GENERIC 1
+        m_targetWindow = this;
+
+#ifdef __WXMAC__
+        this->MacSetClipChildren(true);

 #endif
 
 #endif
 

+        this->Connect(wxEVT_PAINT, wxPaintEventHandler(wxScrolled::OnPaint));
+
+        // by default, we're scrollable in both directions (but if one of the
+        // styles is specified explicitly, we shouldn't add the other one
+        // automatically)
+        if ( !(style & (wxHSCROLL | wxVSCROLL)) )
+            style |= wxHSCROLL | wxVSCROLL;
+
+        return T::Create(parent, winid, pos, size, style, name);
+    }
+
+    // we need to return a special WM_GETDLGCODE value to process just the
+    // arrows but let the other navigation characters through
+#ifdef __WXMSW__
+    virtual WXLRESULT MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
+    {
+        return FilterMSWWindowProc(nMsg, T::MSWWindowProc(nMsg, wParam, lParam));
+    }
+#endif // __WXMSW__
+
+    WX_FORWARD_TO_SCROLL_HELPER()
+
+protected:
+    virtual wxSize DoGetBestSize() const
+    {
+        return FilterBestSize(this, this, T::DoGetBestSize());
+    }
+
+private:
+    // this is needed for wxEVT_PAINT processing hack described in
+    // wxScrollHelperEvtHandler::ProcessEvent()
+    void OnPaint(wxPaintEvent& event)
+    {
+        // the user code didn't really draw the window if we got here, so set
+        // this flag to try to call OnDraw() later
+        ResetDrawnFlag();
+        event.Skip();
+    }
+
+    // VC++ 6 gives warning for the declaration of template member function
+    // without definition
+#ifndef __VISUALC6__
+    wxDECLARE_NO_COPY_CLASS(wxScrolled);

 #endif
 #endif

-    // _WX_SCROLWIN_H_BASE_
+};
+
+#ifdef __VISUALC6__
+    // disable the warning about non dll-interface class used as base for
+    // dll-interface class: it's harmless in this case
+    #pragma warning(push)
+    #pragma warning(disable:4275)
+#endif
+
+// for compatibility with existing code, we provide wxScrolledWindow
+// "typedef" for wxScrolled<wxPanel>. It's not a real typedef because we
+// want wxScrolledWindow to show in wxRTTI information (the class is widely
+// used and likelihood of its wxRTTI information being used too is high):
+class WXDLLIMPEXP_CORE wxScrolledWindow : public wxScrolled<wxPanel>
+{
+public:
+    wxScrolledWindow() : wxScrolled<wxPanel>() {}
+    wxScrolledWindow(wxWindow *parent,
+                     wxWindowID winid = wxID_ANY,
+                     const wxPoint& pos = wxDefaultPosition,
+                     const wxSize& size = wxDefaultSize,
+                     long style = wxScrolledWindowStyle,
+                     const wxString& name = wxPanelNameStr)
+        : wxScrolled<wxPanel>(parent, winid, pos, size, style, name) {}
+
+    DECLARE_DYNAMIC_CLASS_NO_COPY(wxScrolledWindow)
+};
+
+typedef wxScrolled<wxWindow> wxScrolledCanvas;
+
+#ifdef __VISUALC6__
+    #pragma warning(pop)
+#endif
+
+#endif // _WX_SCROLWIN_H_BASE_