+#include "wx/panel.h"
+
+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
+};
+
+// ----------------------------------------------------------------------------
+// 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 WXDLLIMPEXP_CORE wxScrollHelperBase
+{
+public:
+ // 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,
+ bool noRefresh = false );
+
+ // scroll to the given (in logical coords) position
+ //
+ // 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 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
+ 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, wxWidgets
+ // 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. Disable for when the scroll increment is used to
+ // actually scroll a non-constant distance
+ //
+ // Notice that calling this method with a false argument doesn't disable
+ // scrolling the window in this direction, it just changes the mechanism by
+ // which it is implemented to not use wxWindow::ScrollWindow().
+ 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
+ void GetViewStart(int *x, int *y) const { DoGetViewStart(x, y); }
+
+ 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; }
+ double GetScaleX() const { return m_scaleX; }
+ double GetScaleY() const { return m_scaleY; }
+
+ // translate between scrolled and unscrolled coordinates
+ 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
+ virtual void AdjustScrollbars() = 0;
+
+ // Calculate scroll increment
+ 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).
+ void SetTargetWindow(wxWindow *target);
+ wxWindow *GetTargetWindow() const;
+
+ void SetTargetRect(const wxRect& rect) { m_rectToScroll = rect; }
+ wxRect GetTargetRect() const { return m_rectToScroll; }
+
+ // Override this function to draw the graphic (or just process EVT_PAINT)
+ virtual void OnDraw(wxDC& WXUNUSED(dc)) { }
+
+ // change the DC origin according to the scroll position.
+ virtual void DoPrepareDC(wxDC& dc);
+
+ // are we generating the autoscroll events?
+ bool IsAutoScrolling() const { return m_timerAutoScroll != NULL; }
+
+ // stop generating the scroll events when mouse is held outside the window
+ void StopAutoScrolling();
+
+ // this method can be overridden in a derived class to forbid sending the
+ // auto scroll events - note that unlike StopAutoScrolling() it doesn't
+ // 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
+ virtual bool SendAutoScrollEvents(wxScrollWinEvent& event) const;
+
+ // the methods to be called from the window event handlers
+ void HandleOnScroll(wxScrollWinEvent& event);
+ void HandleOnSize(wxSizeEvent& event);
+ void HandleOnPaint(wxPaintEvent& event);
+ void HandleOnChar(wxKeyEvent& event);
+ void HandleOnMouseEnter(wxMouseEvent& event);
+ void HandleOnMouseLeave(wxMouseEvent& event);
+#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
+ const wxRect *GetScrollRect() const
+ {
+ return m_rectToScroll.width != 0 ? &m_rectToScroll : NULL;
+ }
+
+ // get the size of the target window
+ wxSize GetTargetSize() const
+ {
+ return m_rectToScroll.width != 0 ? m_rectToScroll.GetSize()
+ : m_targetWindow->GetClientSize();
+ }
+
+ void GetTargetSize(int *w, int *h) const
+ {
+ wxSize size = GetTargetSize();
+ if ( w )
+ *w = size.x;
+ if ( h )
+ *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();
projects / wxWidgets.git / blobdiff