[Windows] add is highcontrast (#153)

Author: i10416

linux/java/WindowX11.java

@@ -145,4 +145,4 @@ public Window restore() {
     @ApiStatus.Internal public native void _nMinimize();
     @ApiStatus.Internal public native void _nRestore();
     @ApiStatus.Internal public native Screen _nSetTitle(byte[] title);
-}
+}

macos/java/WindowMac.java

@@ -146,4 +146,4 @@ public void close() {
     @ApiStatus.Internal public native void _nMaximize();
     @ApiStatus.Internal public native void _nRestore();
     @ApiStatus.Internal public native void _nClose();
-}
+}

shared/cc/Theme.hh

@@ -0,0 +1,8 @@
+#pragma once
+
+namespace jwm {
+    class Theme {
+       public:
+           bool isHighContrast();
+    };
+}  // namespace jwm

shared/java/Theme.java

@@ -0,0 +1,24 @@
+package io.github.humbleui.jwm;
+
+import org.jetbrains.annotations.*;
+import io.github.humbleui.jwm.impl.*;
+
+public class Theme {
+
+    /**
+     * <p>>Check whether OS currently uses high contrast mode.</p>
+     *
+     * @return          bool;
+     */
+    public static boolean isHighContrast() {
+        assert _onUIThread();
+        return _nIsHighContrast();
+    }
+
+
+    @ApiStatus.Internal public static boolean _onUIThread() {
+        return App._onUIThread();
+    }
+
+    @ApiStatus.Internal public static native boolean _nIsHighContrast();
+}

shared/java/Window.java

@@ -298,4 +298,4 @@ public void close() {
     @ApiStatus.Internal public native void _nSetEventListener(Consumer<Event> eventListener);
     @ApiStatus.Internal public native void _nSetTextInputClient(TextInputClient client);
     @ApiStatus.Internal public abstract void _nSetMouseCursor(int cursorIdx);
-}
+}

windows/CMakeLists.txt

@@ -45,6 +45,8 @@ set(JWM_WINDOWS_SOURCES_CXX
     cc/LayerRaster.hh
     cc/LayerWGL.cc
     cc/LayerWGL.hh
+    cc/ThemeWin32.cc
+    cc/ThemeWin32.hh
     cc/PlatformWin32.hh
     cc/ScreenWin32.cc
     cc/ScreenWin32.hh

windows/cc/AppWin32.hh

@@ -5,6 +5,7 @@
 #include <D3D12/DX12Common.hh>
 #include <ContextWGL.hh>
 #include <ScreenWin32.hh>
+#include <ThemeWin32.hh>
 #include <jni.h>
 
 namespace jwm {
@@ -25,11 +26,13 @@ namespace jwm {
         ContextWGL& getContextWGL() { return _wglContext; }
         DX12Common& getDx12Common() { return _dx12common; }
         JNIEnv* getJniEnv() const { return _jniEnv; }
+        ThemeWin32& getTheme() { return _theme; }
 
     private:
         std::vector<ScreenWin32> _screens;
         WindowManagerWin32 _windowManager;
         ClipboardWin32 _clipboard;
+        ThemeWin32 _theme;
         ContextWGL _wglContext;
         DX12Common _dx12common;
         JNIEnv* _jniEnv;
@@ -40,4 +43,4 @@ namespace jwm {
         static AppWin32& getInstance() { return gInstance; }
         static AppWin32 gInstance;
     };
-}
+}

windows/cc/ThemeWin32.cc

@@ -0,0 +1,36 @@
+#include "ThemeWin32.hh"
+
+#include <Uxtheme.h>
+#include <impl/Library.hh>
+#include <AppWin32.hh>
+#include <VersionHelpers.h>
+#include <WinUser.h>
+#include <stdio.h>
+#include <Log.hh>
+#include <PlatformWin32.hh>
+#include "Theme.hh"
+
+
+bool jwm::ThemeWin32::isHighContrast() {
+    HIGHCONTRASTA highContrast;
+    highContrast.cbSize = sizeof(HIGHCONTRASTA);
+    highContrast.dwFlags = 0;
+    highContrast.lpszDefaultScheme = nullptr;
+    bool isOk = SystemParametersInfoA(SPI_GETHIGHCONTRAST, 0, &highContrast, 0);
+    if (!isOk) {
+        JWM_VERBOSE("Failed to get SystemParametersInfoA for high contrast");
+        return false;
+    }
+    JWM_VERBOSE("is HighContrast? '"
+                << ((HCF_HIGHCONTRASTON & highContrast.dwFlags) == 1) << "'");
+    return (HCF_HIGHCONTRASTON & highContrast.dwFlags) == 1;
+}
+
+// JNI
+
+extern "C" JNIEXPORT bool JNICALL Java_io_github_humbleui_jwm_Theme__1nIsHighContrast
+        (JNIEnv* env, jclass jclass) {
+    jwm::AppWin32& app = jwm::AppWin32::getInstance();
+    jwm::ThemeWin32& theme = app.getTheme();
+    return theme.isHighContrast();
+}

windows/cc/ThemeWin32.hh

@@ -0,0 +1,17 @@
+#pragma once
+#include <PlatformWin32.hh>
+
+#include "Theme.hh"
+#include "ThemeWin32.hh"
+
+namespace jwm {
+  
+    class ThemeWin32 final : public Theme {
+       public:
+           ThemeWin32() = default;
+           ~ThemeWin32() = default;
+       
+           bool isHighContrast();
+
+    };
+}  // namespace jwm

windows/cc/WindowWin32.hh

@@ -54,6 +54,7 @@ namespace jwm {
         void setIcon(const std::wstring& iconPath);
         void setOpacity(float opacity);
         float getOpacity();
+        bool isHighContrast();
         void setMouseCursor(MouseCursor cursor);
         void setVisible(bool value);
         void maximize();
@@ -116,4 +117,4 @@ namespace jwm {
         int _nextCallbackID = 0;
         wchar_t _highSurrogate = 0;
     };
-}
+}