X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/8d7eaf91403705cdd94acaae0d7413e711cce3dc..07aaf32633ecf18ec3edfbb41793a112914792d0:/src/msw/dcclient.cpp?ds=sidebyside diff --git a/src/msw/dcclient.cpp b/src/msw/dcclient.cpp index d318904387..1da0e01531 100644 --- a/src/msw/dcclient.cpp +++ b/src/msw/dcclient.cpp @@ -1,5 +1,5 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: dcclient.cpp +// Name: src/msw/dcclient.cpp // Purpose: wxClientDC class // Author: Julian Smart // Modified by: @@ -24,121 +24,196 @@ #pragma hdrstop #endif -#include "wx/string.h" -#include "wx/log.h" -#include "wx/window.h" +#include "wx/dcclient.h" +#include "wx/msw/dcclient.h" -#include "wx/msw/private.h" +#ifndef WX_PRECOMP + #include "wx/string.h" + #include "wx/hashmap.h" + #include "wx/log.h" + #include "wx/window.h" +#endif -#include "wx/dcclient.h" +#include "wx/msw/private.h" // ---------------------------------------------------------------------------- -// array/list types +// local data structures // ---------------------------------------------------------------------------- -struct WXDLLEXPORT wxPaintDCInfo +// This is a base class for two concrete subclasses below and contains HDC +// cached for the duration of the WM_PAINT processing together with some +// bookkeeping information. +class wxPaintDCInfo { - wxPaintDCInfo(wxWindow *win, wxDC *dc) +public: + wxPaintDCInfo(HDC hdc) + : m_hdc(hdc) { - hwnd = win->GetHWND(); - hdc = dc->GetHDC(); - count = 1; } - WXHWND hwnd; // window for this DC - WXHDC hdc; // the DC handle - size_t count; // usage count + // The derived class must perform some cleanup. + virtual ~wxPaintDCInfo() = 0; + + WXHDC GetHDC() const { return (WXHDC)m_hdc; } + +protected: + const HDC m_hdc; + + wxDECLARE_NO_COPY_CLASS(wxPaintDCInfo); }; -#include "wx/arrimpl.cpp" +namespace +{ + +// This subclass contains information for the HDCs we create ourselves, i.e. +// those for which we call BeginPaint() -- and hence need to call EndPaint(). +class wxPaintDCInfoOur : public wxPaintDCInfo +{ +public: + wxPaintDCInfoOur(wxWindow* win) + : wxPaintDCInfo(::BeginPaint(GetHwndOf(win), GetPaintStructPtr(m_ps))), + m_hwnd(GetHwndOf(win)) + { + } + + virtual ~wxPaintDCInfoOur() + { + ::EndPaint(m_hwnd, &m_ps); + } -WX_DEFINE_OBJARRAY(wxArrayDCInfo) +private: + // This helper is only needed in order to call it from the ctor initializer + // list. + static PAINTSTRUCT* GetPaintStructPtr(PAINTSTRUCT& ps) + { + wxZeroMemory(ps); + return &ps; + } -// ---------------------------------------------------------------------------- -// macros -// ---------------------------------------------------------------------------- + const HWND m_hwnd; + PAINTSTRUCT m_ps; -IMPLEMENT_DYNAMIC_CLASS(wxWindowDC, wxDC) -IMPLEMENT_DYNAMIC_CLASS(wxClientDC, wxWindowDC) -IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxClientDC) -IMPLEMENT_CLASS(wxPaintDCEx, wxPaintDC) + wxDECLARE_NO_COPY_CLASS(wxPaintDCInfoOur); +}; + +// This subclass contains information for the HDCs we receive from outside, as +// WPARAM of WM_PAINT itself. +class wxPaintDCInfoExternal : public wxPaintDCInfo +{ +public: + wxPaintDCInfoExternal(HDC hdc) + : wxPaintDCInfo(hdc), + m_state(::SaveDC(hdc)) + { + } + + virtual ~wxPaintDCInfoExternal() + { + ::RestoreDC(m_hdc, m_state); + } + +private: + const int m_state; + + wxDECLARE_NO_COPY_CLASS(wxPaintDCInfoExternal); +}; + +// The global map containing HDC to use for the given window. The entries in +// this map only exist during WM_PAINT processing and are destroyed when it is +// over. +// +// It is needed because in some circumstances it can happen that more than one +// wxPaintDC is created for the same window during its WM_PAINT handling (and +// as this can happen implicitly, e.g. by calling a function in some library, +// this can be quite difficult to find) but we need to reuse the same HDC for +// all of them because we can't call BeginPaint() more than once. So we cache +// the first HDC created for the window in this map and then reuse it later if +// needed. And, of course, remove it from the map when the painting is done. +WX_DECLARE_HASH_MAP(wxWindow *, wxPaintDCInfo *, + wxPointerHash, wxPointerEqual, + PaintDCInfos); + +PaintDCInfos gs_PaintDCInfos; + +} // anonymous namespace // ---------------------------------------------------------------------------- // global variables // ---------------------------------------------------------------------------- -static PAINTSTRUCT g_paintStruct; - -#ifdef __WXDEBUG__ +#ifdef wxHAS_PAINT_DEBUG // a global variable which we check to verify that wxPaintDC are only // created in response to WM_PAINT message - doing this from elsewhere is a // common programming error among wxWidgets programmers and might lead to // very subtle and difficult to debug refresh/repaint bugs. int g_isPainting = 0; -#endif // __WXDEBUG__ +#endif // wxHAS_PAINT_DEBUG // =========================================================================== // implementation // =========================================================================== // ---------------------------------------------------------------------------- -// wxWindowDC +// wxMSWWindowDCImpl // ---------------------------------------------------------------------------- -wxWindowDC::wxWindowDC() +IMPLEMENT_ABSTRACT_CLASS(wxWindowDCImpl, wxMSWDCImpl) + +wxWindowDCImpl::wxWindowDCImpl( wxDC *owner ) : + wxMSWDCImpl( owner ) { - m_canvas = NULL; } -wxWindowDC::wxWindowDC(wxWindow *canvas) +wxWindowDCImpl::wxWindowDCImpl( wxDC *owner, wxWindow *window ) : + wxMSWDCImpl( owner ) { - wxCHECK_RET( canvas, _T("invalid window in wxWindowDC") ); + wxCHECK_RET( window, wxT("invalid window in wxWindowDCImpl") ); - m_canvas = canvas; - m_hDC = (WXHDC) ::GetWindowDC(GetHwndOf(m_canvas)); + m_window = window; + m_hDC = (WXHDC) ::GetWindowDC(GetHwndOf(m_window)); // m_bOwnsDC was already set to false in the base class ctor, so the DC // will be released (and not deleted) in ~wxDC InitDC(); } -void wxWindowDC::InitDC() +void wxWindowDCImpl::InitDC() { // the background mode is only used for text background and is set in // DrawText() to OPAQUE as required, otherwise always TRANSPARENT, ::SetBkMode(GetHdc(), TRANSPARENT); - // default bg colour is pne of the window - SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID)); - // since we are a window dc we need to grab the palette from the window #if wxUSE_PALETTE InitializePalette(); #endif } -void wxWindowDC::DoGetSize(int *width, int *height) const +void wxWindowDCImpl::DoGetSize(int *width, int *height) const { - wxCHECK_RET( m_canvas, _T("wxWindowDC without a window?") ); + wxCHECK_RET( m_window, wxT("wxWindowDCImpl without a window?") ); - m_canvas->GetSize(width, height); + m_window->GetSize(width, height); } // ---------------------------------------------------------------------------- -// wxClientDC +// wxClientDCImpl // ---------------------------------------------------------------------------- -wxClientDC::wxClientDC() +IMPLEMENT_ABSTRACT_CLASS(wxClientDCImpl, wxWindowDCImpl) + +wxClientDCImpl::wxClientDCImpl( wxDC *owner ) : + wxWindowDCImpl( owner ) { - m_canvas = NULL; } -wxClientDC::wxClientDC(wxWindow *canvas) +wxClientDCImpl::wxClientDCImpl( wxDC *owner, wxWindow *window ) : + wxWindowDCImpl( owner ) { - wxCHECK_RET( canvas, _T("invalid window in wxClientDC") ); + wxCHECK_RET( window, wxT("invalid window in wxClientDCImpl") ); - m_canvas = canvas; - m_hDC = (WXHDC)::GetDC(GetHwndOf(m_canvas)); + m_window = window; + m_hDC = (WXHDC)::GetDC(GetHwndOf(window)); // m_bOwnsDC was already set to false in the base class ctor, so the DC // will be released (and not deleted) in ~wxDC @@ -146,9 +221,9 @@ wxClientDC::wxClientDC(wxWindow *canvas) InitDC(); } -void wxClientDC::InitDC() +void wxClientDCImpl::InitDC() { - wxWindowDC::InitDC(); + wxWindowDCImpl::InitDC(); // in wxUniv build we must manually do some DC adjustments usually // performed by Windows for us @@ -157,7 +232,7 @@ void wxClientDC::InitDC() // Windows CE because they're just another control there, not anything // special as usually under Windows #if defined(__WXUNIVERSAL__) || defined(__WXWINCE__) - wxPoint ptOrigin = m_canvas->GetClientAreaOrigin(); + wxPoint ptOrigin = m_window->GetClientAreaOrigin(); if ( ptOrigin.x || ptOrigin.y ) { // no need to shift DC origin if shift is null @@ -165,192 +240,148 @@ void wxClientDC::InitDC() } // clip the DC to avoid overwriting the non client area - SetClippingRegion(wxPoint(0,0), m_canvas->GetClientSize()); + wxSize size = m_window->GetClientSize(); + DoSetClippingRegion(0, 0, size.x, size.y); #endif // __WXUNIVERSAL__ || __WXWINCE__ } -wxClientDC::~wxClientDC() +wxClientDCImpl::~wxClientDCImpl() { } -void wxClientDC::DoGetSize(int *width, int *height) const +void wxClientDCImpl::DoGetSize(int *width, int *height) const { - wxCHECK_RET( m_canvas, _T("wxClientDC without a window?") ); + wxCHECK_RET( m_window, wxT("wxClientDCImpl without a window?") ); - m_canvas->GetClientSize(width, height); + m_window->GetClientSize(width, height); } // ---------------------------------------------------------------------------- -// wxPaintDC +// wxPaintDCImpl // ---------------------------------------------------------------------------- -// VZ: initial implementation (by JACS) only remembered the last wxPaintDC -// created and tried to reuse it - this was supposed to take care of a -// situation when a derived class OnPaint() calls base class OnPaint() -// because in this case ::BeginPaint() shouldn't be called second time. -// -// I'm not sure how useful this is, however we must remember the HWND -// associated with the last HDC as well - otherwise we may (and will!) try -// to reuse the HDC for another HWND which is a nice recipe for disaster. -// -// So we store a list of windows for which we already have the DC and not -// just one single hDC. This seems to work, but I'm really not sure about -// the usefullness of the whole idea - IMHO it's much better to not call -// base class OnPaint() at all, or, if we really want to allow it, add a -// "wxPaintDC *" parameter to wxPaintEvent which should be used if it's -// !NULL instead of creating a new DC. +IMPLEMENT_ABSTRACT_CLASS(wxPaintDCImpl, wxClientDCImpl) -wxArrayDCInfo wxPaintDC::ms_cache; - -wxPaintDC::wxPaintDC() +wxPaintDCImpl::wxPaintDCImpl( wxDC *owner ) : + wxClientDCImpl( owner ) { - m_canvas = NULL; } -wxPaintDC::wxPaintDC(wxWindow *canvas) +wxPaintDCImpl::wxPaintDCImpl( wxDC *owner, wxWindow *window ) : + wxClientDCImpl( owner ) { - wxCHECK_RET( canvas, wxT("NULL canvas in wxPaintDC ctor") ); + wxCHECK_RET( window, wxT("NULL canvas in wxPaintDCImpl ctor") ); -#ifdef __WXDEBUG__ +#ifdef wxHAS_PAINT_DEBUG if ( g_isPainting <= 0 ) { - wxFAIL_MSG( wxT("wxPaintDC may be created only in EVT_PAINT handler!") ); + wxFAIL_MSG( wxT("wxPaintDCImpl may be created only in EVT_PAINT handler!") ); return; } -#endif // __WXDEBUG__ +#endif // wxHAS_PAINT_DEBUG + + // see comments in src/msw/window.cpp where this is defined + extern bool wxDidCreatePaintDC; - m_canvas = canvas; + wxDidCreatePaintDC = true; + + + m_window = window; // do we have a DC for this window in the cache? - wxPaintDCInfo *info = FindInCache(); - if ( info ) + m_hDC = FindDCInCache(m_window); + if ( !m_hDC ) { - m_hDC = info->hdc; - info->count++; - } - else // not in cache, create a new one - { - m_hDC = (WXHDC)::BeginPaint(GetHwndOf(m_canvas), &g_paintStruct); - if (m_hDC) - ms_cache.Add(new wxPaintDCInfo(m_canvas, this)); + // not in cache, create a new one + wxPaintDCInfoOur* const info = new wxPaintDCInfoOur(m_window); + gs_PaintDCInfos[m_window] = info; + m_hDC = info->GetHDC(); } - // (re)set the DC parameters. // Note: at this point m_hDC can be NULL under MicroWindows, when dragging. - if (GetHDC()) - InitDC(); + if (!GetHDC()) + return; + + // (re)set the DC parameters. + InitDC(); + + // the HDC can have a clipping box (which we didn't set), make sure our + // DoGetClippingBox() checks for it + m_clipping = true; } -wxPaintDC::~wxPaintDC() +wxPaintDCImpl::~wxPaintDCImpl() { if ( m_hDC ) { SelectOldObjects(m_hDC); + m_hDC = 0; + } +} - size_t index; - wxPaintDCInfo *info = FindInCache(&index); - - wxCHECK_RET( info, wxT("existing DC should have a cache entry") ); - if ( --info->count == 0 ) - { - ::EndPaint(GetHwndOf(m_canvas), &g_paintStruct); +/* static */ +wxPaintDCInfo *wxPaintDCImpl::FindInCache(wxWindow *win) +{ + PaintDCInfos::const_iterator it = gs_PaintDCInfos.find( win ); - ms_cache.RemoveAt(index); + return it != gs_PaintDCInfos.end() ? it->second : NULL; +} - // Reduce the number of bogus reports of non-freed memory - // at app exit - if (ms_cache.IsEmpty()) - ms_cache.Clear(); - } - //else: cached DC entry is still in use +/* static */ +WXHDC wxPaintDCImpl::FindDCInCache(wxWindow* win) +{ + wxPaintDCInfo* const info = FindInCache(win); - // prevent the base class dtor from ReleaseDC()ing it again - m_hDC = 0; - } + return info ? info->GetHDC() : 0; } -wxPaintDCInfo *wxPaintDC::FindInCache(size_t *index) const +/* static */ +void wxPaintDCImpl::EndPaint(wxWindow *win) { - wxPaintDCInfo *info = NULL; - size_t nCache = ms_cache.GetCount(); - for ( size_t n = 0; n < nCache; n++ ) + wxPaintDCInfo *info = FindInCache(win); + if ( info ) { - wxPaintDCInfo *info1 = &ms_cache[n]; - if ( info1->hwnd == m_canvas->GetHWND() ) - { - info = info1; - if ( index ) - *index = n; - break; - } + gs_PaintDCInfos.erase(win); + delete info; } - - return info; } -// find the entry for this DC in the cache (keyed by the window) -WXHDC wxPaintDC::FindDCInCache(wxWindow* win) +wxPaintDCInfo::~wxPaintDCInfo() { - size_t nCache = ms_cache.GetCount(); - for ( size_t n = 0; n < nCache; n++ ) - { - wxPaintDCInfo *info = &ms_cache[n]; - if ( info->hwnd == win->GetHWND() ) - { - return info->hdc; - } - } - return 0; } /* * wxPaintDCEx */ -// TODO: don't duplicate wxPaintDC code here!! - -wxPaintDCEx::wxPaintDCEx(wxWindow *canvas, WXHDC dc) : saveState(0) +class wxPaintDCExImpl: public wxPaintDCImpl { - wxCHECK_RET( dc, wxT("wxPaintDCEx requires an existing device context") ); +public: + wxPaintDCExImpl( wxDC *owner, wxWindow *window, WXHDC dc ); + ~wxPaintDCExImpl(); +}; - m_canvas = canvas; - wxPaintDCInfo *info = FindInCache(); - if ( info ) - { - m_hDC = info->hdc; - info->count++; - } - else // not in cache, create a new one - { - m_hDC = dc; - ms_cache.Add(new wxPaintDCInfo(m_canvas, this)); - saveState = SaveDC((HDC) dc); - } -} +IMPLEMENT_ABSTRACT_CLASS(wxPaintDCEx,wxPaintDC) -wxPaintDCEx::~wxPaintDCEx() +wxPaintDCEx::wxPaintDCEx(wxWindow *window, WXHDC dc) + : wxPaintDC(new wxPaintDCExImpl(this, window, dc)) { - size_t index; - wxPaintDCInfo *info = FindInCache(&index); - - wxCHECK_RET( info, wxT("existing DC should have a cache entry") ); +} - if ( --info->count == 0 ) - { - RestoreDC((HDC) m_hDC, saveState); - ms_cache.RemoveAt(index); +wxPaintDCExImpl::wxPaintDCExImpl(wxDC *owner, wxWindow *window, WXHDC dc) + : wxPaintDCImpl( owner ) +{ + wxCHECK_RET( dc, wxT("wxPaintDCEx requires an existing device context") ); - // Reduce the number of bogus reports of non-freed memory - // at app exit - if (ms_cache.IsEmpty()) - ms_cache.Clear(); - } - //else: cached DC entry is still in use + m_window = window; + m_hDC = dc; +} +wxPaintDCExImpl::~wxPaintDCExImpl() +{ // prevent the base class dtor from ReleaseDC()ing it again m_hDC = 0; } -