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511 lines
19 KiB
C++
511 lines
19 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/scrolwin.h
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// Purpose: wxScrolledWindow, wxScrolledControl and wxScrollHelper
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// Author: Vadim Zeitlin
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// Modified by:
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// Created: 30.08.00
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// Copyright: (c) 2000 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_SCROLWIN_H_BASE_
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#define _WX_SCROLWIN_H_BASE_
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#include "wx/control.h"
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#include "wx/panel.h"
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#ifdef __WXOSX__
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#include "wx/scrolbar.h"
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#endif
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class WXDLLIMPEXP_FWD_CORE wxScrollHelperEvtHandler;
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class WXDLLIMPEXP_FWD_BASE wxTimer;
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// default scrolled window style: scroll in both directions
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#define wxScrolledWindowStyle (wxHSCROLL | wxVSCROLL)
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// values for the second argument of wxScrollHelper::ShowScrollbars()
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enum wxScrollbarVisibility
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{
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wxSHOW_SB_NEVER = -1, // never show the scrollbar at all
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wxSHOW_SB_DEFAULT, // show scrollbar only if it is needed
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wxSHOW_SB_ALWAYS // always show scrollbar, even if not needed
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};
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// ----------------------------------------------------------------------------
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// The hierarchy of scrolling classes is a bit complicated because we want to
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// put as much functionality as possible in a mix-in class not deriving from
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// wxWindow so that other classes could derive from the same base class on all
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// platforms irrespectively of whether they are native controls (and hence
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// don't use our scrolling) or not.
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//
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// So we have
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//
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// wxAnyScrollHelperBase
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// |
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// |
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// \|/
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// wxScrollHelperBase
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// |
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// |
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// \|/
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// wxWindow wxScrollHelper
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// | \ / /
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// | \ / /
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// | _| |_ /
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// | wxScrolledWindow /
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// | /
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// \|/ /
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// wxControl /
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// \ /
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// \ /
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// _| |_
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// wxScrolledControl
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//
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// ----------------------------------------------------------------------------
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// This class allows reusing some of wxScrollHelperBase functionality in
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// wxVarScrollHelperBase in wx/vscroll.h without duplicating its code.
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class WXDLLIMPEXP_CORE wxAnyScrollHelperBase
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{
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public:
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explicit wxAnyScrollHelperBase(wxWindow* win);
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virtual ~wxAnyScrollHelperBase() {}
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// Disable use of keyboard keys for scrolling. By default cursor movement
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// keys (including Home, End, Page Up and Down) are used to scroll the
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// window appropriately. If the derived class uses these keys for something
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// else, e.g. changing the currently selected item, this function can be
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// used to disable this behaviour as it's not only not necessary then but
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// can actually be actively harmful if another object forwards a keyboard
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// event corresponding to one of the above keys to us using
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// ProcessWindowEvent() because the event will always be processed which
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// can be undesirable.
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void DisableKeyboardScrolling() { m_kbdScrollingEnabled = false; }
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// Override this function to draw the graphic (or just process EVT_PAINT)
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virtual void OnDraw(wxDC& WXUNUSED(dc)) { }
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// change the DC origin according to the scroll position.
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virtual void DoPrepareDC(wxDC& dc) = 0;
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// Simple accessor for the window that is really being scrolled.
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wxWindow *GetTargetWindow() const { return m_targetWindow; }
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// The methods called from the window event handlers.
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void HandleOnChar(wxKeyEvent& event);
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void HandleOnPaint(wxPaintEvent& event);
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protected:
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// the window that receives the scroll events and the window to actually
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// scroll, respectively
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wxWindow *m_win,
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*m_targetWindow;
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// whether cursor keys should scroll the window
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bool m_kbdScrollingEnabled;
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};
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// This is the class containing the guts of (uniform) scrolling logic.
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class WXDLLIMPEXP_CORE wxScrollHelperBase : public wxAnyScrollHelperBase
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{
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public:
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// ctor must be given the associated window
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wxScrollHelperBase(wxWindow *winToScroll);
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virtual ~wxScrollHelperBase();
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// configure the scrolling
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virtual void SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
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int noUnitsX, int noUnitsY,
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int xPos = 0, int yPos = 0,
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bool noRefresh = false );
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// scroll to the given (in logical coords) position
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//
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// notice that for backwards compatibility reasons Scroll() is virtual as
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// the existing code could override it but new code should override
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// DoScroll() instead
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virtual void Scroll(int x, int y) { DoScroll(x, y); }
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virtual void Scroll(const wxPoint& pt) { DoScroll(pt.x, pt.y); }
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// get/set the page size for this orientation (wxVERTICAL/wxHORIZONTAL)
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int GetScrollPageSize(int orient) const;
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void SetScrollPageSize(int orient, int pageSize);
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// get the number of lines the window can scroll,
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// returns 0 if no scrollbars are there.
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int GetScrollLines( int orient ) const;
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// Set the x, y scrolling increments.
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void SetScrollRate( int xstep, int ystep );
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// get the size of one logical unit in physical ones
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void GetScrollPixelsPerUnit(int *pixelsPerUnitX, int *pixelsPerUnitY) const;
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// Set scrollbar visibility: it is possible to show scrollbar only if it is
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// needed (i.e. if our virtual size is greater than the current size of the
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// associated window), always (as wxALWAYS_SHOW_SB style does) or never (in
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// which case you should provide some other way to scroll the window as the
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// user wouldn't be able to do it at all)
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void ShowScrollbars(wxScrollbarVisibility horz, wxScrollbarVisibility vert)
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{
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DoShowScrollbars(horz, vert);
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}
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// Test whether the specified scrollbar is shown.
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virtual bool IsScrollbarShown(int orient) const = 0;
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// Enable/disable Windows scrolling in either direction. If true, wxWidgets
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// scrolls the canvas and only a bit of the canvas is invalidated; no
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// Clear() is necessary. If false, the whole canvas is invalidated and a
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// Clear() is necessary. Disable for when the scroll increment is used to
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// actually scroll a non-constant distance
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//
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// Notice that calling this method with a false argument doesn't disable
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// scrolling the window in this direction, it just changes the mechanism by
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// which it is implemented to not use wxWindow::ScrollWindow().
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virtual void EnableScrolling(bool x_scrolling, bool y_scrolling);
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// Get the view start
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void GetViewStart(int *x, int *y) const { DoGetViewStart(x, y); }
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wxPoint GetViewStart() const
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{
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wxPoint pt;
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DoGetViewStart(&pt.x, &pt.y);
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return pt;
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}
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// Set the scale factor, used in PrepareDC
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void SetScale(double xs, double ys) { m_scaleX = xs; m_scaleY = ys; }
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double GetScaleX() const { return m_scaleX; }
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double GetScaleY() const { return m_scaleY; }
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// translate between scrolled and unscrolled coordinates
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void CalcScrolledPosition(int x, int y, int *xx, int *yy) const
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{ DoCalcScrolledPosition(x, y, xx, yy); }
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wxPoint CalcScrolledPosition(const wxPoint& pt) const
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{
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wxPoint p2;
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DoCalcScrolledPosition(pt.x, pt.y, &p2.x, &p2.y);
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return p2;
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}
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void CalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
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{ DoCalcUnscrolledPosition(x, y, xx, yy); }
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wxPoint CalcUnscrolledPosition(const wxPoint& pt) const
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{
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wxPoint p2;
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DoCalcUnscrolledPosition(pt.x, pt.y, &p2.x, &p2.y);
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return p2;
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}
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void DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const;
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void DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const;
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// Adjust the scrollbars
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virtual void AdjustScrollbars() = 0;
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// Calculate scroll increment
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int CalcScrollInc(wxScrollWinEvent& event);
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// Normally the wxScrolledWindow will scroll itself, but in some rare
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// occasions you might want it to scroll [part of] another window (e.g. a
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// child of it in order to scroll only a portion the area between the
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// scrollbars (spreadsheet: only cell area will move).
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void SetTargetWindow(wxWindow *target);
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void SetTargetRect(const wxRect& rect) { m_rectToScroll = rect; }
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wxRect GetTargetRect() const { return m_rectToScroll; }
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virtual void DoPrepareDC(wxDC& dc) wxOVERRIDE;
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// are we generating the autoscroll events?
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bool IsAutoScrolling() const { return m_timerAutoScroll != NULL; }
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// stop generating the scroll events when mouse is held outside the window
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void StopAutoScrolling();
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// this method can be overridden in a derived class to forbid sending the
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// auto scroll events - note that unlike StopAutoScrolling() it doesn't
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// stop the timer, so it will be called repeatedly and will typically
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// return different values depending on the current mouse position
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//
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// the base class version just returns true
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virtual bool SendAutoScrollEvents(wxScrollWinEvent& event) const;
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// the methods to be called from the window event handlers
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void HandleOnScroll(wxScrollWinEvent& event);
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void HandleOnSize(wxSizeEvent& event);
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void HandleOnMouseEnter(wxMouseEvent& event);
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void HandleOnMouseLeave(wxMouseEvent& event);
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#if wxUSE_MOUSEWHEEL
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void HandleOnMouseWheel(wxMouseEvent& event);
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#endif // wxUSE_MOUSEWHEEL
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void HandleOnChildFocus(wxChildFocusEvent& event);
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#if WXWIN_COMPATIBILITY_2_8
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wxDEPRECATED(
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void OnScroll(wxScrollWinEvent& event) { HandleOnScroll(event); }
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)
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#endif // WXWIN_COMPATIBILITY_2_8
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protected:
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// get pointer to our scroll rect if we use it or NULL
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const wxRect *GetScrollRect() const
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{
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return m_rectToScroll.width != 0 ? &m_rectToScroll : NULL;
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}
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// get the size of the target window
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wxSize GetTargetSize() const
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{
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return m_rectToScroll.width != 0 ? m_rectToScroll.GetSize()
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: m_targetWindow->GetClientSize();
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}
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void GetTargetSize(int *w, int *h) const
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{
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wxSize size = GetTargetSize();
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if ( w )
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*w = size.x;
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if ( h )
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*h = size.y;
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}
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// implementation of public methods with the same name
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virtual void DoGetViewStart(int *x, int *y) const;
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virtual void DoScroll(int x, int y) = 0;
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virtual void DoShowScrollbars(wxScrollbarVisibility horz,
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wxScrollbarVisibility vert) = 0;
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// implementations of various wxWindow virtual methods which should be
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// forwarded to us (this can be done by WX_FORWARD_TO_SCROLL_HELPER())
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bool ScrollLayout();
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void ScrollDoSetVirtualSize(int x, int y);
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wxSize ScrollGetBestVirtualSize() const;
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// change just the target window (unlike SetWindow which changes m_win as
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// well)
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void DoSetTargetWindow(wxWindow *target);
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// delete the event handler we installed
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void DeleteEvtHandler();
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// this function should be overridden to return the size available for
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// m_targetWindow inside m_win of the given size
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//
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// the default implementation is only good for m_targetWindow == m_win
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// case, if we're scrolling a subwindow you must override this method
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virtual wxSize GetSizeAvailableForScrollTarget(const wxSize& size)
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{
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// returning just size from here is wrong but it was decided that it is
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// not wrong enough to break the existing code (which doesn't override
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// this recently added function at all) by adding this assert
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//
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// wxASSERT_MSG( m_targetWindow == m_win, "must be overridden" );
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return size;
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}
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// Can be overridden to return false if the child window shouldn't be
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// scrolled into view automatically when it gets focus, which is the
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// default behaviour.
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virtual bool ShouldScrollToChildOnFocus(wxWindow* child)
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{
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#if defined(__WXOSX__) && wxUSE_SCROLLBAR
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if ( wxDynamicCast(child, wxScrollBar) )
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return false;
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#else
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wxUnusedVar(child);
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#endif
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return true;
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}
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double m_scaleX;
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double m_scaleY;
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wxRect m_rectToScroll;
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wxTimer *m_timerAutoScroll;
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// The number of pixels to scroll in horizontal and vertical directions
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// respectively.
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//
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// If 0, means that the scrolling in the given direction is disabled.
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int m_xScrollPixelsPerLine;
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int m_yScrollPixelsPerLine;
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int m_xScrollPosition;
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int m_yScrollPosition;
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int m_xScrollLines;
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int m_yScrollLines;
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int m_xScrollLinesPerPage;
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int m_yScrollLinesPerPage;
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bool m_xScrollingEnabled;
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bool m_yScrollingEnabled;
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#if wxUSE_MOUSEWHEEL
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int m_wheelRotation;
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#endif // wxUSE_MOUSEWHEEL
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wxScrollHelperEvtHandler *m_handler;
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wxDECLARE_NO_COPY_CLASS(wxScrollHelperBase);
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};
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// this macro can be used in a wxScrollHelper-derived class to forward wxWindow
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// methods to corresponding wxScrollHelper methods
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#define WX_FORWARD_TO_SCROLL_HELPER() \
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public: \
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virtual void PrepareDC(wxDC& dc) wxOVERRIDE { DoPrepareDC(dc); } \
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virtual bool Layout() wxOVERRIDE { return ScrollLayout(); } \
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virtual bool CanScroll(int orient) const wxOVERRIDE \
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{ return IsScrollbarShown(orient); } \
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virtual void DoSetVirtualSize(int x, int y) wxOVERRIDE \
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{ ScrollDoSetVirtualSize(x, y); } \
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virtual wxSize GetBestVirtualSize() const wxOVERRIDE \
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{ return ScrollGetBestVirtualSize(); }
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// include the declaration of the real wxScrollHelper
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#if defined(__WXGTK20__) && !defined(__WXUNIVERSAL__)
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#include "wx/gtk/scrolwin.h"
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#elif defined(__WXGTK__) && !defined(__WXUNIVERSAL__)
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#include "wx/gtk1/scrolwin.h"
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#else
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#define wxHAS_GENERIC_SCROLLWIN
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#include "wx/generic/scrolwin.h"
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#endif
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// ----------------------------------------------------------------------------
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// wxScrolled<T>: a wxWindow which knows how to scroll
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// ----------------------------------------------------------------------------
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// helper class for wxScrolled<T> below
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struct WXDLLIMPEXP_CORE wxScrolledT_Helper
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{
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static wxSize FilterBestSize(const wxWindow *win,
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const wxScrollHelper *helper,
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const wxSize& origBest);
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#ifdef __WXMSW__
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static WXLRESULT FilterMSWWindowProc(WXUINT nMsg, WXLRESULT origResult);
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#endif
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};
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// Scrollable window base on window type T. This used to be wxScrolledWindow,
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// but wxScrolledWindow includes wxControlContainer functionality and that's
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// not always desirable.
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template<class T>
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bool wxCreateScrolled(T* self,
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wxWindow *parent, wxWindowID winid,
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const wxPoint& pos, const wxSize& size,
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long style, const wxString& name)
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{
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return self->Create(parent, winid, pos, size, style, name);
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}
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#if wxUSE_CONTROLS
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// For wxControl we have to provide overloaded wxCreateScrolled()
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// because wxControl::Create() has 7 parameters and therefore base
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// template expecting 6-parameter T::Create() cannot be used.
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inline bool wxCreateScrolled(wxControl* self,
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wxWindow *parent, wxWindowID winid,
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const wxPoint& pos, const wxSize& size,
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long style, const wxString& name)
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{
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return self->Create(parent, winid, pos, size, style, wxDefaultValidator, name);
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}
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#endif // wxUSE_CONTROLS
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template<class T>
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class wxScrolled : public T,
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public wxScrollHelper,
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private wxScrolledT_Helper
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{
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public:
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wxScrolled() : wxScrollHelper(this) { }
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wxScrolled(wxWindow *parent,
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wxWindowID winid = wxID_ANY,
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const wxPoint& pos = wxDefaultPosition,
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const wxSize& size = wxDefaultSize,
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long style = wxScrolledWindowStyle,
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const wxString& name = wxASCII_STR(wxPanelNameStr))
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: wxScrollHelper(this)
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{
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Create(parent, winid, pos, size, style, name);
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}
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bool Create(wxWindow *parent,
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wxWindowID winid,
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const wxPoint& pos = wxDefaultPosition,
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const wxSize& size = wxDefaultSize,
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long style = wxScrolledWindowStyle,
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const wxString& name = wxASCII_STR(wxPanelNameStr))
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{
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m_targetWindow = this;
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#ifdef __WXMAC__
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this->MacSetClipChildren(true);
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#endif
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// by default, we're scrollable in both directions (but if one of the
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// styles is specified explicitly, we shouldn't add the other one
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// automatically)
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if ( !(style & (wxHSCROLL | wxVSCROLL)) )
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style |= wxHSCROLL | wxVSCROLL;
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return wxCreateScrolled((T*)this, parent, winid, pos, size, style, name);
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}
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#ifdef __WXMSW__
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// we need to return a special WM_GETDLGCODE value to process just the
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// arrows but let the other navigation characters through
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virtual WXLRESULT MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam) wxOVERRIDE
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{
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return FilterMSWWindowProc(nMsg, T::MSWWindowProc(nMsg, wParam, lParam));
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}
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// Take into account the scroll origin.
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virtual void MSWAdjustBrushOrg(int* xOrg, int* yOrg) const wxOVERRIDE
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{
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CalcUnscrolledPosition(*xOrg, *yOrg, xOrg, yOrg);
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}
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#endif // __WXMSW__
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WX_FORWARD_TO_SCROLL_HELPER()
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protected:
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virtual wxSize DoGetBestSize() const wxOVERRIDE
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{
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return FilterBestSize(this, this, T::DoGetBestSize());
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}
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private:
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wxDECLARE_NO_COPY_CLASS(wxScrolled);
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};
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// for compatibility with existing code, we provide wxScrolledWindow
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// "typedef" for wxScrolled<wxPanel>. It's not a real typedef because we
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// want wxScrolledWindow to show in wxRTTI information (the class is widely
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// used and likelihood of its wxRTTI information being used too is high):
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class WXDLLIMPEXP_CORE wxScrolledWindow : public wxScrolled<wxPanel>
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{
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public:
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wxScrolledWindow() : wxScrolled<wxPanel>() {}
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wxScrolledWindow(wxWindow *parent,
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wxWindowID winid = wxID_ANY,
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const wxPoint& pos = wxDefaultPosition,
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const wxSize& size = wxDefaultSize,
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long style = wxScrolledWindowStyle,
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const wxString& name = wxASCII_STR(wxPanelNameStr))
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: wxScrolled<wxPanel>(parent, winid, pos, size, style, name) {}
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wxDECLARE_DYNAMIC_CLASS_NO_COPY(wxScrolledWindow);
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};
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typedef wxScrolled<wxWindow> wxScrolledCanvas;
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#endif // _WX_SCROLWIN_H_BASE_
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