[API] Add support for DockBuilder

imgui-binding/src/main/java/imgui/ImGui.java

@@ -18,7 +18,7 @@ import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.nio.file.StandardCopyOption;
 
-public final class ImGui {
+public class ImGui {
     private static final String LIB_PATH_PROP = "imgui.library.path";
     private static final String LIB_NAME_PROP = "imgui.library.name";
     private static final String LIB_NAME_DEFAULT = System.getProperty("os.arch").contains("64") ? "imgui-java64" : "imgui-java";
@@ -114,9 +114,6 @@ public final class ImGui {
     public static void init() {
     }
 
-    private ImGui() {
-    }
-
     /*JNI
         #include <stdint.h>
         #include <imgui.h>
@@ -650,6 +647,13 @@ public final class ImGui {
         ImGui::SetNextWindowBgAlpha(alpha);
     */
 
+    /**
+     * Set next window viewport.
+     */
+    public static native void setNextWindowViewport(int viewportId); /*
+        ImGui::SetNextWindowViewport(viewportId);
+    */
+
     /**
      * (not recommended) set current window position - call within Begin()/End().
      * Prefer using SetNextWindowPos(), as this may incur tearing and side-effects.