198a4e97a0
Remove caching of whether any of the children accept focus in wxControlContainer as it can change at any moment under Mac, due to full keyboard access being turned on and off (which can be done using Ctrl-F7, i.e. easily, and so this might be something users actually do and not just a theoretical edge case). This also incidentally fixes caching of the wrong focusability state during window initialization, when its children are not yet shown, as [NSView canBecomeKeyView:] used for AcceptsFocusFromKeyboard() implementation under Mac, apparently always returns false for hidden windows. The behaviour under the other platforms should remain the same, but AcceptsFocus() is slower now as it always has to query children instead of being able to avoid doing it when we know that none of them accepts focus anyhow. OTOH this only happens to the windows that don't accept focus themselves and, at least at some moment, don't have any children accepting focus neither, which should be quite rare and optimizing this case doesn't seem to be worth the extra code complexity due to extra preprocessor platform checks. Closes #18089.
434 lines
18 KiB
C++
434 lines
18 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Name: wx/containr.h
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// Purpose: wxControlContainer and wxNavigationEnabled declarations
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// Author: Vadim Zeitlin
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// Modified by:
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// Created: 06.08.01
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// Copyright: (c) 2001, 2011 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_CONTAINR_H_
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#define _WX_CONTAINR_H_
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#include "wx/defs.h"
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#ifndef wxHAS_NATIVE_TAB_TRAVERSAL
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// We need wxEVT_XXX declarations in this case.
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#include "wx/event.h"
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#endif
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class WXDLLIMPEXP_FWD_CORE wxWindow;
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class WXDLLIMPEXP_FWD_CORE wxWindowBase;
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/*
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This header declares wxControlContainer class however it's not a real
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container of controls but rather just a helper used to implement TAB
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navigation among the window children. You should rarely need to use it
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directly, derive from the documented public wxNavigationEnabled<> class to
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implement TAB navigation in a custom composite window.
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*/
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// ----------------------------------------------------------------------------
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// wxControlContainerBase: common part used in both native and generic cases
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_CORE wxControlContainerBase
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{
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public:
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// default ctor, SetContainerWindow() must be called later
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wxControlContainerBase()
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{
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m_winParent = NULL;
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// By default, we accept focus ourselves.
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m_acceptsFocusSelf = true;
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m_inSetFocus = false;
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m_winLastFocused = NULL;
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}
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virtual ~wxControlContainerBase() {}
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void SetContainerWindow(wxWindow *winParent)
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{
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wxASSERT_MSG( !m_winParent, wxT("shouldn't be called twice") );
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m_winParent = winParent;
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}
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// This can be called by the window to indicate that it never wants to have
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// the focus for itself.
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void DisableSelfFocus()
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{ m_acceptsFocusSelf = false; UpdateParentCanFocus(); }
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// This can be called to undo the effect of a previous DisableSelfFocus()
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// (otherwise calling it is not necessary as the window does accept focus
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// by default).
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void EnableSelfFocus()
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{ m_acceptsFocusSelf = true; UpdateParentCanFocus(); }
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// should be called from SetFocus(), returns false if we did nothing with
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// the focus and the default processing should take place
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bool DoSetFocus();
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// returns whether we should accept focus ourselves or not
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bool AcceptsFocus() const;
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// Returns whether we or one of our children accepts focus.
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bool AcceptsFocusRecursively() const
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{ return AcceptsFocus() || HasAnyChildrenAcceptingFocus(); }
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// We accept focus from keyboard if we accept it at all.
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bool AcceptsFocusFromKeyboard() const { return AcceptsFocusRecursively(); }
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// Call this when the number of children of the window changes.
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//
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// Returns true if we have any focusable children, false otherwise.
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bool UpdateCanFocusChildren();
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#ifdef __WXMSW__
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// This is not strictly related to navigation, but all windows containing
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// more than one children controls need to return from this method if any
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// of their parents has an inheritable background, so do this automatically
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// for all of them (another alternative could be to do it in wxWindow
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// itself but this would be potentially more backwards incompatible and
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// could conceivably break some custom windows).
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bool HasTransparentBackground() const;
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#endif // __WXMSW__
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protected:
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// set the focus to the child which had it the last time
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virtual bool SetFocusToChild();
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// return true if we have any children accepting focus
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bool HasAnyFocusableChildren() const;
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// return true if we have any children that do accept focus right now
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bool HasAnyChildrenAcceptingFocus() const;
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// the parent window we manage the children for
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wxWindow *m_winParent;
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// the child which had the focus last time this panel was activated
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wxWindow *m_winLastFocused;
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private:
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// Update the window status to reflect whether it is getting focus or not.
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void UpdateParentCanFocus(bool acceptsFocusChildren);
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void UpdateParentCanFocus()
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{
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UpdateParentCanFocus(HasAnyFocusableChildren());
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}
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// Indicates whether the associated window can ever have focus itself.
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//
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// Usually this is the case, e.g. a wxPanel can be used either as a
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// container for its children or just as a normal window which can be
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// focused. But sometimes, e.g. for wxStaticBox, we can never have focus
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// ourselves and can only get it if we have any focusable children.
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bool m_acceptsFocusSelf;
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// a guard against infinite recursion
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bool m_inSetFocus;
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};
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#ifdef wxHAS_NATIVE_TAB_TRAVERSAL
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// ----------------------------------------------------------------------------
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// wxControlContainer for native TAB navigation
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// ----------------------------------------------------------------------------
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// this must be a real class as we forward-declare it elsewhere
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class WXDLLIMPEXP_CORE wxControlContainer : public wxControlContainerBase
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{
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protected:
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// set the focus to the child which had it the last time
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virtual bool SetFocusToChild() wxOVERRIDE;
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};
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#else // !wxHAS_NATIVE_TAB_TRAVERSAL
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// ----------------------------------------------------------------------------
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// wxControlContainer for TAB navigation implemented in wx itself
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_CORE wxControlContainer : public wxControlContainerBase
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{
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public:
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// default ctor, SetContainerWindow() must be called later
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wxControlContainer();
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// the methods to be called from the window event handlers
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void HandleOnNavigationKey(wxNavigationKeyEvent& event);
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void HandleOnFocus(wxFocusEvent& event);
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void HandleOnWindowDestroy(wxWindowBase *child);
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// called from OnChildFocus() handler, i.e. when one of our (grand)
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// children gets the focus
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void SetLastFocus(wxWindow *win);
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protected:
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wxDECLARE_NO_COPY_CLASS(wxControlContainer);
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};
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#endif // wxHAS_NATIVE_TAB_TRAVERSAL/!wxHAS_NATIVE_TAB_TRAVERSAL
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// this function is for wxWidgets internal use only
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extern WXDLLIMPEXP_CORE bool wxSetFocusToChild(wxWindow *win, wxWindow **child);
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// ----------------------------------------------------------------------------
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// wxNavigationEnabled: Derive from this class to support keyboard navigation
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// among window children in a wxWindow-derived class. The details of this class
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// don't matter, you just need to derive from it to make navigation work.
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// ----------------------------------------------------------------------------
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// The template parameter W must be a wxWindow-derived class.
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template <class W>
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class wxNavigationEnabled : public W
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{
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public:
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typedef W BaseWindowClass;
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wxNavigationEnabled()
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{
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m_container.SetContainerWindow(this);
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#ifndef wxHAS_NATIVE_TAB_TRAVERSAL
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BaseWindowClass::Bind(wxEVT_NAVIGATION_KEY,
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&wxNavigationEnabled::OnNavigationKey, this);
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BaseWindowClass::Bind(wxEVT_SET_FOCUS,
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&wxNavigationEnabled::OnFocus, this);
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BaseWindowClass::Bind(wxEVT_CHILD_FOCUS,
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&wxNavigationEnabled::OnChildFocus, this);
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#endif // !wxHAS_NATIVE_TAB_TRAVERSAL
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}
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WXDLLIMPEXP_INLINE_CORE virtual bool AcceptsFocus() const wxOVERRIDE
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{
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return m_container.AcceptsFocus();
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}
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WXDLLIMPEXP_INLINE_CORE virtual bool AcceptsFocusRecursively() const wxOVERRIDE
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{
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return m_container.AcceptsFocusRecursively();
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}
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WXDLLIMPEXP_INLINE_CORE virtual bool AcceptsFocusFromKeyboard() const wxOVERRIDE
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{
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return m_container.AcceptsFocusFromKeyboard();
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}
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WXDLLIMPEXP_INLINE_CORE virtual void AddChild(wxWindowBase *child) wxOVERRIDE
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{
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BaseWindowClass::AddChild(child);
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if ( m_container.UpdateCanFocusChildren() )
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{
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// Under MSW we must have wxTAB_TRAVERSAL style for TAB navigation
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// to work.
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if ( !BaseWindowClass::HasFlag(wxTAB_TRAVERSAL) )
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BaseWindowClass::ToggleWindowStyle(wxTAB_TRAVERSAL);
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}
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}
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WXDLLIMPEXP_INLINE_CORE virtual void RemoveChild(wxWindowBase *child) wxOVERRIDE
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{
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#ifndef wxHAS_NATIVE_TAB_TRAVERSAL
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m_container.HandleOnWindowDestroy(child);
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#endif // !wxHAS_NATIVE_TAB_TRAVERSAL
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BaseWindowClass::RemoveChild(child);
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// We could reset wxTAB_TRAVERSAL here but it doesn't seem to do any
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// harm to keep it.
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m_container.UpdateCanFocusChildren();
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}
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WXDLLIMPEXP_INLINE_CORE virtual void SetFocus() wxOVERRIDE
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{
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if ( !m_container.DoSetFocus() )
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BaseWindowClass::SetFocus();
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}
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void SetFocusIgnoringChildren()
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{
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BaseWindowClass::SetFocus();
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}
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#ifdef __WXMSW__
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WXDLLIMPEXP_INLINE_CORE virtual bool HasTransparentBackground() wxOVERRIDE
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{
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return m_container.HasTransparentBackground();
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}
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WXDLLIMPEXP_INLINE_CORE
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virtual void WXDoUpdatePendingFocus(wxWindow* win) wxOVERRIDE
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{
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return m_container.SetLastFocus(win);
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}
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#endif // __WXMSW__
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protected:
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#ifndef wxHAS_NATIVE_TAB_TRAVERSAL
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void OnNavigationKey(wxNavigationKeyEvent& event)
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{
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m_container.HandleOnNavigationKey(event);
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}
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void OnFocus(wxFocusEvent& event)
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{
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m_container.HandleOnFocus(event);
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}
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void OnChildFocus(wxChildFocusEvent& event)
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{
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m_container.SetLastFocus(event.GetWindow());
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event.Skip();
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}
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#endif // !wxHAS_NATIVE_TAB_TRAVERSAL
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wxControlContainer m_container;
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wxDECLARE_NO_COPY_TEMPLATE_CLASS(wxNavigationEnabled, W);
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};
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// ----------------------------------------------------------------------------
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// Compatibility macros from now on, do NOT use them and preferably do not even
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// look at them.
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// ----------------------------------------------------------------------------
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#if WXWIN_COMPATIBILITY_2_8
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// common part of WX_DECLARE_CONTROL_CONTAINER in the native and generic cases,
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// it should be used in the wxWindow-derived class declaration
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#define WX_DECLARE_CONTROL_CONTAINER_BASE() \
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public: \
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virtual bool AcceptsFocus() const; \
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virtual bool AcceptsFocusRecursively() const; \
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virtual bool AcceptsFocusFromKeyboard() const; \
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virtual void AddChild(wxWindowBase *child); \
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virtual void RemoveChild(wxWindowBase *child); \
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virtual void SetFocus(); \
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void SetFocusIgnoringChildren(); \
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\
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protected: \
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wxControlContainer m_container
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// this macro must be used in the derived class ctor
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#define WX_INIT_CONTROL_CONTAINER() \
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m_container.SetContainerWindow(this)
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// common part of WX_DELEGATE_TO_CONTROL_CONTAINER in the native and generic
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// cases, must be used in the wxWindow-derived class implementation
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#define WX_DELEGATE_TO_CONTROL_CONTAINER_BASE(classname, basename) \
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void classname::AddChild(wxWindowBase *child) \
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{ \
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basename::AddChild(child); \
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\
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m_container.UpdateCanFocusChildren(); \
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} \
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\
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bool classname::AcceptsFocusRecursively() const \
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{ \
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return m_container.AcceptsFocusRecursively(); \
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} \
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\
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void classname::SetFocus() \
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{ \
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if ( !m_container.DoSetFocus() ) \
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basename::SetFocus(); \
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} \
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\
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bool classname::AcceptsFocus() const \
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{ \
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return m_container.AcceptsFocus(); \
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} \
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\
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bool classname::AcceptsFocusFromKeyboard() const \
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{ \
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return m_container.AcceptsFocusFromKeyboard(); \
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}
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#ifdef wxHAS_NATIVE_TAB_TRAVERSAL
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#define WX_EVENT_TABLE_CONTROL_CONTAINER(classname)
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#define WX_DECLARE_CONTROL_CONTAINER WX_DECLARE_CONTROL_CONTAINER_BASE
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#define WX_DELEGATE_TO_CONTROL_CONTAINER(classname, basename) \
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WX_DELEGATE_TO_CONTROL_CONTAINER_BASE(classname, basename) \
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\
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void classname::RemoveChild(wxWindowBase *child) \
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{ \
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basename::RemoveChild(child); \
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\
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m_container.UpdateCanFocusChildren(); \
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} \
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\
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void classname::SetFocusIgnoringChildren() \
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{ \
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basename::SetFocus(); \
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}
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#else // !wxHAS_NATIVE_TAB_TRAVERSAL
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// declare the methods to be forwarded
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#define WX_DECLARE_CONTROL_CONTAINER() \
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WX_DECLARE_CONTROL_CONTAINER_BASE(); \
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\
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public: \
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void OnNavigationKey(wxNavigationKeyEvent& event); \
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void OnFocus(wxFocusEvent& event); \
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virtual void OnChildFocus(wxChildFocusEvent& event)
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// implement the event table entries for wxControlContainer
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#define WX_EVENT_TABLE_CONTROL_CONTAINER(classname) \
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EVT_SET_FOCUS(classname::OnFocus) \
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EVT_CHILD_FOCUS(classname::OnChildFocus) \
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EVT_NAVIGATION_KEY(classname::OnNavigationKey)
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// implement the methods forwarding to the wxControlContainer
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#define WX_DELEGATE_TO_CONTROL_CONTAINER(classname, basename) \
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WX_DELEGATE_TO_CONTROL_CONTAINER_BASE(classname, basename) \
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\
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void classname::RemoveChild(wxWindowBase *child) \
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{ \
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m_container.HandleOnWindowDestroy(child); \
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\
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basename::RemoveChild(child); \
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\
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m_container.UpdateCanFocusChildren(); \
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} \
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\
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void classname::OnNavigationKey( wxNavigationKeyEvent& event ) \
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{ \
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m_container.HandleOnNavigationKey(event); \
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} \
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\
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void classname::SetFocusIgnoringChildren() \
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{ \
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basename::SetFocus(); \
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} \
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\
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void classname::OnChildFocus(wxChildFocusEvent& event) \
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{ \
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m_container.SetLastFocus(event.GetWindow()); \
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event.Skip(); \
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} \
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\
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void classname::OnFocus(wxFocusEvent& event) \
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{ \
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m_container.HandleOnFocus(event); \
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}
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#endif // wxHAS_NATIVE_TAB_TRAVERSAL/!wxHAS_NATIVE_TAB_TRAVERSAL
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#endif // WXWIN_COMPATIBILITY_2_8
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#endif // _WX_CONTAINR_H_
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