Feature: window opacity (HumbleUI#134)

i10416 · Aug 25, 2021 · a76550c · a76550c
1 parent d1c0704
commit a76550c
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Showing 8 changed files with 58 additions and 1 deletion.
diff --git a/examples/java/org/jetbrains/jwm/examples/Example.java b/examples/java/org/jetbrains/jwm/examples/Example.java
@@ -68,10 +68,12 @@ public Example() {
             case 4 -> window.setWindowPosition(bounds.getLeft() + bounds.getWidth() / 2, bounds.getTop() + bounds.getHeight() / 2);
         }
         window.setTitle("JWM Window #" + count);
+
         switch (Platform.CURRENT) {
             case WINDOWS -> window.setIcon(new File("examples/resources/windows.ico"));
             case MACOS -> window.setIcon(new File("examples/resources/macos.icns"));
         }
+        window.setOpacity(0.8f);
         window.setMouseCursor(MouseCursor.ARROW);
         window.show();
         window.requestFrame();

diff --git a/linux/java/org/jetbrains/jwm/WindowX11.java b/linux/java/org/jetbrains/jwm/WindowX11.java
@@ -88,6 +88,12 @@ public Window setIcon(File icon) {
         return this;
     }
 
+    @Override
+    public Window setOpacity(float opacity) {
+        // TODO: impl me!
+        return this;
+    }
+
     @Override
     public Screen getScreen() {
         assert _onUIThread();

diff --git a/macos/java/org/jetbrains/jwm/WindowMac.java b/macos/java/org/jetbrains/jwm/WindowMac.java
@@ -78,6 +78,12 @@ public Window setIcon(File icon) {
         _nSetIcon(icon.getAbsolutePath().toString());
         return this;
     }
+
+    @Override
+    public Window setOpacity(float opacity) {
+        // TODO: impl me!
+        return this;
+    }
 
     public Window setMouseCursor(MouseCursor cursor) {
         assert _onUIThread();

diff --git a/shared/java/org/jetbrains/jwm/Window.java b/shared/java/org/jetbrains/jwm/Window.java
@@ -57,6 +57,13 @@ public UIRect getContentRectAbsolute() {
     @NotNull @Contract("-> this")
     public abstract Window setIcon(File icon);
     public abstract Window setMouseCursor(MouseCursor cursor);
+
+    /**
+    *  Sets window opacity (0.0 - 1.0)
+    *  If the opacity is outside the range, it will be rounded to 0.0 to 1.0.
+     */
+    @NotNull @Contract("-> this")
+    public abstract Window setOpacity(float opacity);
 
     public abstract Screen getScreen();
 

diff --git a/windows/cc/PlatformWin32.hh b/windows/cc/PlatformWin32.hh
@@ -1,5 +1,4 @@
 #pragma once
-
 #include <cwctype>
 #include <windows.h>
 #include <winuser.h>
@@ -11,6 +10,9 @@
 #ifdef max
  #undef max
 #endif
+#ifdef min
+ #undef min
+#endif
 
 #ifndef JWM_WIN32_WINDOW_CLASS_NAME
  #define JWM_WIN32_WINDOW_CLASS_NAME L"JWM_WINDOW"

diff --git a/windows/cc/WindowWin32.cc b/windows/cc/WindowWin32.cc
@@ -1,3 +1,4 @@
+#include <algorithm>
 #include <PlatformWin32.hh>
 #include <AppWin32.hh>
 #include <WindowWin32.hh>
@@ -74,6 +75,25 @@ void jwm::WindowWin32::setIcon(const std::wstring& iconPath) {
     HICON hicon = (HICON)LoadImage(NULL, iconPath.c_str(), IMAGE_ICON, 0, 0, LR_LOADFROMFILE | LR_DEFAULTSIZE);
     SendMessage(_hWnd, WM_SETICON, ICON_SMALL, (LPARAM)hicon);
 }
+
+void jwm::WindowWin32::setOpacity(float opacity) {
+    JWM_VERBOSE("Set window opacity'" << opacity << "'");
+    LONG_PTR previousStyle = GetWindowLongPtr(_hWnd, GWL_EXSTYLE);
+    float lower = 0.0;
+    float upper = 1.0;
+    float clamped = std::max(lower, std::min(opacity, upper));
+    if (clamped == 1.0)
+    {
+        LONG reset = previousStyle & ~WS_EX_LAYERED;
+        SetWindowLongPtr(_hWnd, GWL_EXSTYLE, reset);
+        return;
+    }
+    LONG_PTR opacityEnabled = previousStyle |= WS_EX_LAYERED;
+    SetWindowLongPtr(_hWnd, GWL_EXSTYLE, opacityEnabled);
+    int adjusted = static_cast<int>(round(clamped * 255));
+    SetLayeredWindowAttributes(_hWnd, RGB(0, 0, 0), adjusted, LWA_ALPHA);
+}
+
 void jwm::WindowWin32::setMouseCursor(MouseCursor cursor) {
     JWM_VERBOSE("Set window cursor '" << mouseCursorToStr(cursor) << "'");
 
@@ -872,6 +892,11 @@ extern "C" JNIEXPORT void JNICALL Java_org_jetbrains_jwm_WindowWin32__1nSetIcon
     instance->setIcon(std::wstring(reinterpret_cast<const wchar_t*>(iconPathStr), length));
     env->ReleaseStringChars(iconPath, iconPathStr);
 }
+extern "C" JNIEXPORT void JNICALL Java_org_jetbrains_jwm_WindowWin32__1nSetOpacity
+        (JNIEnv* env, jobject obj,float opacity) {
+    jwm::WindowWin32* instance = reinterpret_cast<jwm::WindowWin32*>(jwm::classes::Native::fromJava(env, obj));
+    instance->setOpacity(opacity);
+}
 extern "C" JNIEXPORT void JNICALL Java_org_jetbrains_jwm_WindowWin32__1nSetMouseCursor
         (JNIEnv* env, jobject obj, jint cursorId) {
     jwm::WindowWin32* instance = reinterpret_cast<jwm::WindowWin32*>(jwm::classes::Native::fromJava(env, obj));

diff --git a/windows/cc/WindowWin32.hh b/windows/cc/WindowWin32.hh
@@ -52,6 +52,7 @@ namespace jwm {
         void setImeEnabled(bool enabled);
         void setTitle(const std::wstring& title);
         void setIcon(const std::wstring& iconPath);
+        void setOpacity(float opacity);
         void setMouseCursor(MouseCursor cursor);
         void show();
         void requestSwap();

diff --git a/windows/java/org/jetbrains/jwm/WindowWin32.java b/windows/java/org/jetbrains/jwm/WindowWin32.java
@@ -80,6 +80,13 @@ public Window setIcon(File icon){
         _nSetIcon(icon.getAbsolutePath().toString());
         return this;
     }
+
+    @Override
+    public Window setOpacity(float opacity) {
+        assert _onUIThread();
+        _nSetOpacity(opacity);
+        return this;
+    }
 
     @Override
     public Window setMouseCursor(MouseCursor cursor) {
@@ -133,6 +140,7 @@ public void close() {
     @ApiStatus.Internal public native void _nSetContentSize(int width, int height);
     @ApiStatus.Internal public native void _nSetTitle(String title);
     @ApiStatus.Internal public native void _nSetIcon(String iconPath);
+    @ApiStatus.Internal public native void _nSetOpacity(float opacity);
     @ApiStatus.Internal public native void _nSetMouseCursor(int cursorId);
     @ApiStatus.Internal public native Screen _nGetScreen();
     @ApiStatus.Internal public native void _nRequestFrame();