From a5d13e19dd7f6037e10b649c49805922ae5e0fa6 Mon Sep 17 00:00:00 2001
From: SineStriker <trueful@163.com>
Date: 周五, 22 12月 2023 17:04:29 +0800
Subject: [PATCH] Prepare to remove style support again

---
 src/core/contexts/win32windowcontext.cpp |  156 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 155 insertions(+), 1 deletions(-)

diff --git a/src/core/contexts/win32windowcontext.cpp b/src/core/contexts/win32windowcontext.cpp
index 4d1a6ff..969a275 100644
--- a/src/core/contexts/win32windowcontext.cpp
+++ b/src/core/contexts/win32windowcontext.cpp
@@ -55,7 +55,7 @@
 
     static inline quint32 getDpiForWindow(HWND hwnd) {
         const DynamicApis &apis = DynamicApis::instance();
-        if (apis.pGetDpiForWindow) {         // Win10
+        if (apis.pGetDpiForWindow) { // Win10
             return apis.pGetDpiForWindow(hwnd);
         } else if (apis.pGetDpiForMonitor) { // Win8.1
             HMONITOR monitor = ::MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
@@ -787,6 +787,160 @@
         return false; // Not handled
     }
 
+    bool Win32WindowContext::windowAttributeChanged(const QString &key, const QVariant &attribute,
+                                                    const QVariant &oldAttribute) {
+        const auto hwnd = reinterpret_cast<HWND>(window->winId());
+        const DynamicApis &apis = DynamicApis::instance();
+        if (key == QStringLiteral("mica")) {
+            if (!isWin11OrGreater()) {
+                return false;
+            }
+            if (attribute.toBool()) {
+                // We need to extend the window frame into the whole client area to be able
+                // to see the blurred window background.
+                static constexpr const MARGINS margins = {-1, -1, -1, -1};
+                apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
+                if (isWin1122H2OrGreater()) {
+                    // Use official DWM API to enable Mica, available since Windows 11 22H2
+                    // (10.0.22621).
+                    const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_MAINWINDOW;
+                    apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType,
+                                                sizeof(backdropType));
+                } else {
+                    // Use undocumented DWM API to enable Mica, available since Windows 11
+                    // (10.0.22000).
+                    const BOOL enable = TRUE;
+                    apis.pDwmSetWindowAttribute(hwnd, _DWMWA_MICA_EFFECT, &enable, sizeof(enable));
+                }
+            } else {
+                if (isWin1122H2OrGreater()) {
+                    const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_AUTO;
+                    apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType,
+                                                sizeof(backdropType));
+                } else {
+                    const BOOL enable = FALSE;
+                    apis.pDwmSetWindowAttribute(hwnd, _DWMWA_MICA_EFFECT, &enable, sizeof(enable));
+                }
+                static constexpr const MARGINS margins = {0, 0, 0, 0};
+                apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
+            }
+            return true;
+        } else if (key == QStringLiteral("mica-alt")) {
+            if (!isWin1122H2OrGreater()) {
+                return false;
+            }
+            if (attribute.toBool()) {
+                // We need to extend the window frame into the whole client area to be able
+                // to see the blurred window background.
+                static constexpr const MARGINS margins = {-1, -1, -1, -1};
+                apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
+                // Use official DWM API to enable Mica Alt, available since Windows 11 22H2
+                // (10.0.22621).
+                const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_TABBEDWINDOW;
+                apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType,
+                                            sizeof(backdropType));
+            } else {
+                const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_AUTO;
+                apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType,
+                                            sizeof(backdropType));
+                static constexpr const MARGINS margins = {0, 0, 0, 0};
+                apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
+            }
+            return true;
+        } else if (key == QStringLiteral("acrylic-material")) {
+            if (!isWin10OrGreater()) {
+                return false;
+            }
+            if (attribute.userType() == QMetaType::QColor) {
+                // We need to extend the window frame into the whole client area to be able
+                // to see the blurred window background.
+                static constexpr const MARGINS margins = {-1, -1, -1, -1};
+                apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
+                if (isWin11OrGreater()) {
+                    const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_TRANSIENTWINDOW;
+                    apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType,
+                                                sizeof(backdropType));
+                } else {
+                    auto gradientColor = attribute.value<QColor>();
+
+                    ACCENT_POLICY policy{};
+                    policy.dwAccentState = ACCENT_ENABLE_ACRYLICBLURBEHIND;
+                    policy.dwAccentFlags = ACCENT_ENABLE_ACRYLIC_WITH_LUMINOSITY;
+                    // This API expects the #AABBGGRR format.
+                    policy.dwGradientColor =
+                        DWORD(qRgba(gradientColor.blue(), gradientColor.green(),
+                                    gradientColor.red(), gradientColor.alpha()));
+                    WINDOWCOMPOSITIONATTRIBDATA wcad{};
+                    wcad.Attrib = WCA_ACCENT_POLICY;
+                    wcad.pvData = &policy;
+                    wcad.cbData = sizeof(policy);
+                    apis.pSetWindowCompositionAttribute(hwnd, &wcad);
+                }
+            } else {
+                if (isWin11OrGreater()) {
+                    const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_AUTO;
+                    apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType,
+                                                sizeof(backdropType));
+                } else {
+                    ACCENT_POLICY policy{};
+                    policy.dwAccentState = ACCENT_DISABLED;
+                    policy.dwAccentFlags = ACCENT_NONE;
+                    WINDOWCOMPOSITIONATTRIBDATA wcad{};
+                    wcad.Attrib = WCA_ACCENT_POLICY;
+                    wcad.pvData = &policy;
+                    wcad.cbData = sizeof(policy);
+                    apis.pSetWindowCompositionAttribute(hwnd, &wcad);
+                }
+                static constexpr const MARGINS margins = {0, 0, 0, 0};
+                apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
+            }
+            return true;
+        } else if (key == QStringLiteral("dwm-blur")) {
+            if (attribute.toBool()) {
+                // We need to extend the window frame into the whole client area to be able
+                // to see the blurred window background.
+                static constexpr const MARGINS margins = {-1, -1, -1, -1};
+                apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
+                if (isWin8OrGreater()) {
+                    ACCENT_POLICY policy{};
+                    policy.dwAccentState = ACCENT_ENABLE_BLURBEHIND;
+                    policy.dwAccentFlags = ACCENT_NONE;
+                    WINDOWCOMPOSITIONATTRIBDATA wcad{};
+                    wcad.Attrib = WCA_ACCENT_POLICY;
+                    wcad.pvData = &policy;
+                    wcad.cbData = sizeof(policy);
+                    apis.pSetWindowCompositionAttribute(hwnd, &wcad);
+                } else {
+                    DWM_BLURBEHIND bb{};
+                    bb.fEnable = TRUE;
+                    bb.fTransitionOnMaximized = TRUE;
+                    bb.dwFlags = DWM_BB_ENABLE | DWM_BB_TRANSITIONONMAXIMIZED;
+                    apis.pDwmEnableBlurBehindWindow(hwnd, &bb);
+                }
+            } else {
+                if (isWin8OrGreater()) {
+                    ACCENT_POLICY policy{};
+                    policy.dwAccentState = ACCENT_DISABLED;
+                    policy.dwAccentFlags = ACCENT_NONE;
+                    WINDOWCOMPOSITIONATTRIBDATA wcad{};
+                    wcad.Attrib = WCA_ACCENT_POLICY;
+                    wcad.pvData = &policy;
+                    wcad.cbData = sizeof(policy);
+                    apis.pSetWindowCompositionAttribute(hwnd, &wcad);
+                } else {
+                    DWM_BLURBEHIND bb{};
+                    bb.fEnable = FALSE;
+                    bb.dwFlags = DWM_BB_ENABLE;
+                    apis.pDwmEnableBlurBehindWindow(hwnd, &bb);
+                }
+                static constexpr const MARGINS margins = {0, 0, 0, 0};
+                apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
+            }
+            return true;
+        }
+        return false;
+    }
+
     QWK_USED static constexpr const struct {
         const WPARAM wParam = MAKEWPARAM(44500, 61897);
         const LPARAM lParam = MAKELPARAM(62662, 44982); // Not used. Reserve for future use.

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