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feat: support window transparency on Windows #6326

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feat: support window transparency on Windows #6326

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51 changes: 45 additions & 6 deletions src/widgets/Window.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,10 @@
#include <QStandardItemModel>
#include <QVBoxLayout>

#ifdef Q_OS_WIN
# include <dwmapi.h>
#endif

namespace chatterino {

Window::Window(WindowType type, QWidget *parent)
Expand All @@ -76,12 +80,6 @@ Window::Window(WindowType type, QWidget *parent)
if (type == WindowType::Main)
{
this->resize(int(600 * this->scale()), int(500 * this->scale()));
#ifdef Q_OS_LINUX
if (this->theme->window.background.alpha() != 255)
{
this->setAttribute(Qt::WA_TranslucentBackground);
}
#endif
}
else
{
Expand All @@ -107,6 +105,8 @@ Window::Window(WindowType type, QWidget *parent)
},
this->signalHolder_);
}

this->updateWindowTransparency();
}

WindowType Window::getType()
Expand Down Expand Up @@ -265,10 +265,49 @@ void Window::updateStreamerModeIcon()
#endif
}

#ifdef CHATTERINO_SUPPORTS_WINDOW_TRANSPARENCY
void Window::updateWindowTransparency()
{
if (this->type_ == WindowType::Main)
{
if (this->theme->window.background.alpha() != 255)
{
this->setAttribute(Qt::WA_TranslucentBackground);

# ifdef Q_OS_WIN
DWM_BLURBEHIND bb = {0};
bb.dwFlags = DWM_BB_ENABLE;
bb.fEnable = TRUE;
bb.hRgnBlur = nullptr;
::DwmEnableBlurBehindWindow(reinterpret_cast<HWND>(this->winId()),
&bb);
this->enabledBlurBehind_ = true;
# endif
}
# ifdef Q_OS_WIN
else if (this->enabledBlurBehind_)
{
DWM_BLURBEHIND bb = {0};
bb.dwFlags = DWM_BB_ENABLE;
bb.fEnable = FALSE;
bb.hRgnBlur = nullptr;
::DwmEnableBlurBehindWindow(reinterpret_cast<HWND>(this->winId()),
&bb);
this->enabledBlurBehind_ = false;
}
# endif
}
}
#endif

void Window::themeChangedEvent()
{
this->updateStreamerModeIcon();
BaseWindow::themeChangedEvent();

#ifdef CHATTERINO_SUPPORTS_WINDOW_TRANSPARENCY
this->updateWindowTransparency();
#endif
}

void Window::addDebugStuff(HotkeyController::HotkeyMap &actions)
Expand Down
12 changes: 12 additions & 0 deletions src/widgets/Window.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,10 @@ class Channel;

enum class WindowType { Main, Popup, Attached };

#if defined(Q_OS_LINUX) || defined(Q_OS_WIN)
# define CHATTERINO_SUPPORTS_WINDOW_TRANSPARENCY
#endif

class Window : public BaseWindow
{
Q_OBJECT
Expand Down Expand Up @@ -58,6 +62,14 @@ class Window : public BaseWindow
PixmapButton *streamerModeTitlebarIcon_ = nullptr;
void updateStreamerModeIcon();

#ifdef CHATTERINO_SUPPORTS_WINDOW_TRANSPARENCY
void updateWindowTransparency();

# ifdef Q_OS_WIN
bool enabledBlurBehind_ = false;
# endif
#endif

friend class Notebook;
};

Expand Down
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