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darkmode.cpp
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darkmode.cpp
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///////////////////////////////////////////////////////////////////////////////
// Name: src/msw/darkmode.cpp
// Purpose: Support for dark mode in wxMSW
// Author: Vadim Zeitlin
// Created: 2022-06-24
// Copyright: (c) 2022 Vadim Zeitlin <vadim@wxwidgets.org>
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
/*
The code in this file is based on the following sources:
- win32-darkmode by Richard Yu (https://github.com/ysc3839/win32-darkmode)
- UAH menu by adzm (https://github.com/adzm/win32-custom-menubar-aero-theme)
*/
// ============================================================================
// declarations
// ============================================================================
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
// for compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
// Allow predefining this as 0 to disable dark mode support completely.
#ifndef wxUSE_DARK_MODE
// Otherwise enable it by default.
#define wxUSE_DARK_MODE 1
#endif
#if wxUSE_DARK_MODE
#ifndef WX_PRECOMP
#include "wx/app.h"
#include "wx/bitmap.h"
#include "wx/dcmemory.h"
#include "wx/image.h"
#include "wx/log.h"
#endif // WX_PRECOMP
#include "wx/dynlib.h"
#include "wx/module.h"
#include "wx/msw/dc.h"
#include "wx/msw/uxtheme.h"
#include "wx/msw/private/darkmode.h"
static const char* TRACE_DARKMODE = "msw-darkmode";
#define DWMWA_USE_IMMERSIVE_DARK_MODE 20
namespace
{
// Constants for use with SetPreferredAppMode().
enum PreferredAppMode
{
AppMode_Default,
AppMode_AllowDark,
AppMode_ForceDark,
AppMode_ForceLight
};
PreferredAppMode gs_appMode = AppMode_Default;
template <typename T>
bool TryLoadByOrd(T& func, const wxDynamicLibrary& lib, int ordinal)
{
func = (T)::GetProcAddress(lib.GetLibHandle(), MAKEINTRESOURCEA(ordinal));
if ( !func )
{
wxLogTrace(TRACE_DARKMODE,
"Required function with ordinal %d not found", ordinal);
return false;
}
return true;
}
} // anonymous namespace
// ============================================================================
// implementation
// ============================================================================
namespace wxMSWImpl
{
// Global pointers of the functions we use: they're not only undocumented, but
// don't appear in the SDK headers at all.
BOOL (WINAPI *ShouldAppsUseDarkMode)() = nullptr;
BOOL (WINAPI *AllowDarkModeForWindow)(HWND hwnd, BOOL allow) = nullptr;
DWORD (WINAPI *SetPreferredAppMode)(DWORD) = nullptr;
bool InitDarkMode()
{
// Note: for simplicity, we support dark mode only in Windows 10 v2004
// ("20H1", build number 19041) and later, even if, in principle, it could
// be supported as far back as v1809 (build 17763) -- but very few people
// must still use it by now and so it just doesn't seem to be worth it.
if ( !wxCheckOsVersion(10, 0, 19041) )
{
wxLogTrace(TRACE_DARKMODE, "Unsupported due to OS version");
return false;
}
wxLoadedDLL dllUxTheme(wxS("uxtheme.dll"));
// These functions are not only undocumented but are not even exported by
// name, and have to be resolved using their ordinals.
return TryLoadByOrd(ShouldAppsUseDarkMode, dllUxTheme, 132) &&
TryLoadByOrd(AllowDarkModeForWindow, dllUxTheme, 133) &&
TryLoadByOrd(SetPreferredAppMode, dllUxTheme, 135);
}
// This function is only used in this file as it's more clear than using
// IsActive() without the namespace name -- but in the rest of our code, it's
// IsActive() which is more clear.
bool ShouldUseDarkMode()
{
switch ( gs_appMode )
{
case AppMode_Default:
// Dark mode support not enabled, don't try using dark mode.
return false;
case AppMode_AllowDark:
// Follow the global setting.
return wxMSWImpl::ShouldAppsUseDarkMode();
case AppMode_ForceDark:
return true;
case AppMode_ForceLight:
return false;
}
wxFAIL_MSG( "unreachable" );
return false;
}
} // namespace wxMSWImpl
// ----------------------------------------------------------------------------
// Module keeping dark mode-related data
// ----------------------------------------------------------------------------
namespace
{
// This function is documented, but we still load it dynamically to avoid
// having to link with dwmapi.lib.
typedef HRESULT
(WINAPI *DwmSetWindowAttribute_t)(HWND, DWORD, const void*, DWORD);
} // anonymous namespace
class wxDarkModeModule : public wxModule
{
public:
virtual bool OnInit() override { return true; }
virtual void OnExit() override
{
ms_pfnDwmSetWindowAttribute = (DwmSetWindowAttribute_t)-1;
ms_dllDWM.Unload();
}
static DwmSetWindowAttribute_t GetDwmSetWindowAttribute()
{
if ( ms_pfnDwmSetWindowAttribute == (DwmSetWindowAttribute_t)-1 )
{
ms_dllDWM.Load(wxS("dwmapi.dll"), wxDL_VERBATIM | wxDL_QUIET);
wxDL_INIT_FUNC(ms_pfn, DwmSetWindowAttribute, ms_dllDWM);
}
return ms_pfnDwmSetWindowAttribute;
}
private:
static wxDynamicLibrary ms_dllDWM;
static DwmSetWindowAttribute_t ms_pfnDwmSetWindowAttribute;
wxDECLARE_DYNAMIC_CLASS(wxDarkModeModule);
};
wxIMPLEMENT_DYNAMIC_CLASS(wxDarkModeModule, wxModule);
wxDynamicLibrary wxDarkModeModule::ms_dllDWM;
DwmSetWindowAttribute_t
wxDarkModeModule::ms_pfnDwmSetWindowAttribute = (DwmSetWindowAttribute_t)-1;
// ----------------------------------------------------------------------------
// Public API
// ----------------------------------------------------------------------------
bool wxApp::MSWEnableDarkMode(int flags)
{
if ( !wxMSWImpl::InitDarkMode() )
return false;
const PreferredAppMode mode = flags & DarkMode_Always ? AppMode_ForceDark
: AppMode_AllowDark;
const DWORD rc = wxMSWImpl::SetPreferredAppMode(mode);
// It's supposed to return the old mode normally.
if ( rc != static_cast<DWORD>(gs_appMode) )
{
wxLogTrace(TRACE_DARKMODE,
"SetPreferredAppMode(%d) unexpectedly returned %d",
mode, rc);
}
gs_appMode = mode;
return true;
}
// ----------------------------------------------------------------------------
// Supporting functions for the rest of wxMSW code
// ----------------------------------------------------------------------------
namespace wxMSWDarkMode
{
bool IsActive()
{
return wxMSWImpl::ShouldUseDarkMode();
}
void EnableForTLW(HWND hwnd)
{
// Nothing to do, dark mode support not enabled or dark mode is not used.
if ( !wxMSWImpl::ShouldUseDarkMode() )
return;
BOOL useDarkMode = TRUE;
HRESULT hr = wxDarkModeModule::GetDwmSetWindowAttribute()
(
hwnd,
DWMWA_USE_IMMERSIVE_DARK_MODE,
&useDarkMode,
sizeof(useDarkMode)
);
if ( FAILED(hr) )
wxLogApiError("DwmSetWindowAttribute(USE_IMMERSIVE_DARK_MODE)", hr);
wxMSWImpl::AllowDarkModeForWindow(hwnd, TRUE);
}
void AllowForWindow(HWND hwnd, const wchar_t* themeName, const wchar_t* themeId)
{
if ( !wxMSWImpl::ShouldUseDarkMode() )
return;
if ( wxMSWImpl::AllowDarkModeForWindow(hwnd, TRUE) )
wxLogTrace(TRACE_DARKMODE, "Allow dark mode for %p failed", hwnd);
if ( themeName || themeId )
{
HRESULT hr = ::SetWindowTheme(hwnd, themeName, themeId);
if ( FAILED(hr) )
{
wxLogApiError(wxString::Format("SetWindowTheme(%p, %s, %s)",
hwnd, themeName, themeId), hr);
}
}
}
wxColour GetColour(wxSystemColour index)
{
// This is not great at all, but better than using light mode colours that
// are not appropriate for the dark mode.
//
// There is also an undocumented GetImmersiveColorFromColorSetEx(), but it
// doesn't seem to return any colours with the values that are actually
// used in e.g. Explorer in the dark mode, such as 0x202020 background.
switch ( index )
{
case wxSYS_COLOUR_BTNSHADOW:
return *wxBLACK;
case wxSYS_COLOUR_ACTIVECAPTION:
case wxSYS_COLOUR_APPWORKSPACE:
case wxSYS_COLOUR_INFOBK:
case wxSYS_COLOUR_LISTBOX:
case wxSYS_COLOUR_WINDOW:
case wxSYS_COLOUR_BTNFACE:
return wxColour(0x202020);
case wxSYS_COLOUR_BTNTEXT:
case wxSYS_COLOUR_CAPTIONTEXT:
case wxSYS_COLOUR_HIGHLIGHTTEXT:
case wxSYS_COLOUR_INFOTEXT:
case wxSYS_COLOUR_LISTBOXHIGHLIGHTTEXT:
case wxSYS_COLOUR_LISTBOXTEXT:
case wxSYS_COLOUR_MENUTEXT:
case wxSYS_COLOUR_WINDOWTEXT:
return wxColour(0xe0e0e0);
case wxSYS_COLOUR_HOTLIGHT:
return wxColour(0x474747);
case wxSYS_COLOUR_SCROLLBAR:
return wxColour(0x4d4d4d);
case wxSYS_COLOUR_INACTIVECAPTION:
case wxSYS_COLOUR_MENU:
return wxColour(0x2b2b2b);
case wxSYS_COLOUR_MENUBAR:
return wxColour(0x626262);
case wxSYS_COLOUR_MENUHILIGHT:
return wxColour(0x353535);
case wxSYS_COLOUR_HIGHLIGHT:
return wxColour(0x777777);
case wxSYS_COLOUR_INACTIVECAPTIONTEXT:
return wxColour(0xaaaaaa);
case wxSYS_COLOUR_3DDKSHADOW:
case wxSYS_COLOUR_3DLIGHT:
case wxSYS_COLOUR_ACTIVEBORDER:
case wxSYS_COLOUR_BTNHIGHLIGHT:
case wxSYS_COLOUR_DESKTOP:
case wxSYS_COLOUR_GRADIENTACTIVECAPTION:
case wxSYS_COLOUR_GRADIENTINACTIVECAPTION:
case wxSYS_COLOUR_GRAYTEXT:
case wxSYS_COLOUR_INACTIVEBORDER:
case wxSYS_COLOUR_WINDOWFRAME:
return wxColour();
case wxSYS_COLOUR_MAX:
break;
}
wxFAIL_MSG( "unreachable" );
return wxColour();
}
HBRUSH GetBackgroundBrush()
{
wxBrush* const brush =
wxTheBrushList->FindOrCreateBrush(GetColour(wxSYS_COLOUR_WINDOW));
return brush ? GetHbrushOf(*brush) : 0;
}
bool PaintIfNecessary(HWND hwnd, WXWNDPROC defWndProc)
{
#if wxUSE_IMAGE
if ( !wxMSWImpl::ShouldUseDarkMode() )
return false;
const RECT rc = wxGetClientRect(hwnd);
const wxSize size{rc.right - rc.left, rc.bottom - rc.top};
// Don't bother doing anything with the empty windows.
if ( size == wxSize() )
return false;
// Ask the control to paint itself on the given bitmap.
wxBitmap bmp(size);
{
wxMemoryDC mdc(bmp);
WPARAM wparam = (WPARAM)GetHdcOf(mdc);
if ( defWndProc )
::CallWindowProc(defWndProc, hwnd, WM_PAINT, wparam, 0);
else
::DefWindowProc(hwnd, WM_PAINT, wparam, 0);
}
wxImage image = bmp.ConvertToImage();
unsigned char *data = image.GetData();
for ( int i = 0; i < size.x*size.y; ++i, data += 3 )
{
wxImage::RGBValue rgb(data[0], data[1], data[2]);
wxImage::HSVValue hsv = wxImage::RGBtoHSV(rgb);
// There is no really good way to convert normal colours to dark mode,
// but try to do a bit better than just inverting the value because
// this results in colours which are much too dark.
hsv.value = sqrt(1.0 - hsv.value*hsv.value);
rgb = wxImage::HSVtoRGB(hsv);
data[0] = rgb.red;
data[1] = rgb.green;
data[2] = rgb.blue;
}
PAINTSTRUCT ps;
wxDCTemp dc(::BeginPaint(hwnd, &ps), size);
dc.DrawBitmap(wxBitmap(image), 0, 0);
::EndPaint(hwnd, &ps);
return true;
#else // !wxUSE_IMAGE
wxUnusedVar(hwnd);
wxUnusedVar(defWndProc);
return false;
#endif
}
// ----------------------------------------------------------------------------
// Menu bar custom drawing
// ----------------------------------------------------------------------------
namespace wxMSWMenuImpl
{
// Definitions for undocumented messages and structs used in this code.
constexpr int WM_MENUBAR_DRAWMENU = 0x91;
constexpr int WM_MENUBAR_DRAWMENUITEM = 0x92;
// This is passed via LPARAM of WM_MENUBAR_DRAWMENU.
struct MenuBarDrawMenu
{
HMENU hmenu;
HDC hdc;
DWORD dwReserved;
};
struct MenuBarMenuItem
{
int iPosition;
// There are more fields in this (undocumented) struct but we don't
// currently need them, so don't bother with declaring them.
};
struct MenuBarDrawMenuItem
{
DRAWITEMSTRUCT dis;
MenuBarDrawMenu mbdm;
MenuBarMenuItem mbmi;
};
constexpr COLORREF COL_STANDARD = 0xffffff;
constexpr COLORREF COL_DISABLED = 0x6d6d6d;
constexpr COLORREF COL_MENU_HOT = 0x414141;
HBRUSH GetMenuBrush()
{
wxBrush* const brush =
wxTheBrushList->FindOrCreateBrush(GetColour(wxSYS_COLOUR_MENU));
return brush ? GetHbrushOf(*brush) : 0;
}
} // namespace wxMSWMenuImpl
bool
HandleMenuMessage(WXLRESULT* result,
wxWindow* w,
WXUINT nMsg,
WXWPARAM wParam,
WXLPARAM lParam)
{
if ( !wxMSWImpl::ShouldUseDarkMode() )
return false;
using namespace wxMSWMenuImpl;
switch ( nMsg )
{
case WM_MENUBAR_DRAWMENU:
// Erase the menu bar background using custom brush.
if ( auto* const drawMenu = (MenuBarDrawMenu*)lParam )
{
HWND hwnd = GetHwndOf(w);
WinStruct<MENUBARINFO> mbi;
if ( !::GetMenuBarInfo(hwnd, OBJID_MENU, 0, &mbi) )
{
wxLogLastError("GetMenuBarInfo");
break;
}
const RECT rcWindow = wxGetWindowRect(hwnd);
// rcBar is expressed in screen coordinates.
::OffsetRect(&mbi.rcBar, -rcWindow.left, -rcWindow.top);
::FillRect(drawMenu->hdc, &mbi.rcBar, GetMenuBrush());
}
*result = 0;
return true;
case WM_NCPAINT:
case WM_NCACTIVATE:
// Drawing the menu bar background in WM_MENUBAR_DRAWMENU somehow
// leaves a single pixel line unpainted (and increasing the size of
// the rectangle doesn't help, i.e. drawing is clipped to an area
// which is one pixel too small), so we have to draw over it here
// to get rid of it.
{
*result = w->MSWDefWindowProc(nMsg, wParam, lParam);
HWND hwnd = GetHwndOf(w);
WindowHDC hdc(hwnd);
// Create a RECT one pixel above the client area: note that we
// have to use window (and not client) coordinates for this as
// this is outside of the client area of the window.
const RECT rcWindow = wxGetWindowRect(hwnd);
RECT rc = wxGetClientRect(hwnd);
// Convert client coordinates to window ones.
wxMapWindowPoints(hwnd, HWND_DESKTOP, &rc);
::OffsetRect(&rc, -rcWindow.left, -rcWindow.top);
rc.bottom = rc.top;
rc.top--;
::FillRect(hdc, &rc, GetMenuBrush());
}
return true;
case WM_MENUBAR_DRAWMENUITEM:
if ( auto* const drawMenuItem = (MenuBarDrawMenuItem*)lParam )
{
const DRAWITEMSTRUCT& dis = drawMenuItem->dis;
// Just a sanity check.
if ( dis.CtlType != ODT_MENU )
break;
wchar_t buf[256];
WinStruct<MENUITEMINFO> mii;
mii.fMask = MIIM_STRING;
mii.dwTypeData = buf;
mii.cch = sizeof(buf) - 1;
// Note that we need to use the iPosition field of the
// undocumented struct here because DRAWITEMSTRUCT::itemID is
// not initialized in the struct passed to us here, so this is
// the only way to identify the item we're dealing with.
if ( !::GetMenuItemInfo((HMENU)dis.hwndItem,
drawMenuItem->mbmi.iPosition,
TRUE,
&mii) )
break;
const UINT itemState = dis.itemState;
HBRUSH hbr = 0;
int partState = 0;
if ( itemState & ODS_INACTIVE )
{
partState = MBI_DISABLED;
}
else if ( (itemState & ODS_GRAYED) && (itemState & ODS_HOTLIGHT) )
{
partState = MBI_DISABLEDHOT;
}
else if ( itemState & ODS_GRAYED )
{
partState = MBI_DISABLED;
}
else if ( itemState & (ODS_HOTLIGHT | ODS_SELECTED) )
{
partState = MBI_HOT;
auto* const
brush = wxTheBrushList->FindOrCreateBrush(COL_MENU_HOT);
if ( brush )
hbr = GetHbrushOf(*brush);
}
else
{
partState = MBI_NORMAL;
}
RECT* const rcItem = const_cast<RECT*>(&dis.rcItem);
// Don't use DrawThemeBackground() here, as it doesn't use the
// correct colours in the dark mode, at least not when using
// the "Menu" theme.
::FillRect(dis.hDC, &dis.rcItem, hbr ? hbr : GetMenuBrush());
// We have to specify the text colour explicitly as by default
// black would be used, making the menu label unreadable on the
// (almost) black background.
DTTOPTS textOpts;
textOpts.dwSize = sizeof(textOpts);
textOpts.dwFlags = DTT_TEXTCOLOR;
textOpts.crText = itemState & (ODS_INACTIVE | ODS_GRAYED)
? COL_DISABLED
: COL_STANDARD;
DWORD drawTextFlags = DT_CENTER | DT_SINGLELINE | DT_VCENTER;
if ( itemState & ODS_NOACCEL)
drawTextFlags |= DT_HIDEPREFIX;
wxUxThemeHandle menuTheme(GetHwndOf(w), L"Menu");
::DrawThemeTextEx(menuTheme, dis.hDC, MENU_BARITEM, partState,
buf, mii.cch, drawTextFlags, rcItem,
&textOpts);
}
return true;
}
return false;
}
} // namespace wxMSWDarkMode
#else // !wxUSE_DARK_MODE
bool wxApp::MSWEnableDarkMode(int WXUNUSED(flags))
{
return false;
}
namespace wxMSWDarkMode
{
bool IsActive()
{
return false;
}
void EnableForTLW(HWND WXUNUSED(hwnd))
{
}
void AllowForWindow(HWND WXUNUSED(hwnd), const wchar_t* WXUNUSED(themeClass))
{
}
wxColour GetColour(wxSystemColour WXUNUSED(index))
{
return wxColour();
}
HBRUSH GetBackgroundBrush()
{
return 0;
}
bool PaintIfNecessary(HWND WXUNUSED(hwnd), WXWNDPROC WXUNUSED(defWndProc))
{
return false;
}
bool
HandleMenuMessage(WXLRESULT* WXUNUSED(result),
wxWindow* WXUNUSED(w),
WXUINT WXUNUSED(nMsg),
WXWPARAM WXUNUSED(wParam),
WXLPARAM WXUNUSED(lParam))
{
return false;
}
} // namespace wxMSWDarkMode
#endif // wxUSE_DARK_MODE/!wxUSE_DARK_MODE