Flip inheritance hierarchy between Application and Window

example/src/main/java/Main.java

@@ -2,7 +2,7 @@
 import imgui.ImFontGlyphRangesBuilder;
 import imgui.ImGui;
 import imgui.ImGuiIO;
-import imgui.app.Application;
+import imgui.app.BGFXWindow;
 import imgui.app.Configuration;
 import imgui.flag.ImGuiConfigFlags;
 import imgui.flag.ImGuiInputTextFlags;
@@ -14,7 +14,7 @@
 import java.nio.file.Files;
 import java.nio.file.Paths;
 
-public class Main extends Application {
+public class Main extends BGFXWindow {
     private final ImString str = new ImString(5);
     private final float[] flt = new float[1];
     private int count = 0;

imgui-app/src/main/java/imgui/app/Application.java

@@ -52,27 +52,33 @@
  * For example, large list of computations could be separated between application ticks. {@link #process()} method is called constantly.
  * Use that wisely and remember that all GUI should be in the main thread.
  */
-public abstract class Application extends Window {
+public abstract class Application {
+
+    protected abstract void init(Configuration config);
+
     /**
      * Method called before window creation. Could be used to provide basic window information, like title name etc.
      *
      * @param config configuration object with basic window information
      */
-    protected void configure(final Configuration config) {
-    }
+    protected abstract void configure(final Configuration config);
 
     /**
      * Method called once, before application run loop.
      */
     protected void preRun() {
     }
 
+    protected abstract void run();
+
     /**
      * Method called once, after application run loop.
      */
     protected void postRun() {
     }
 
+    protected abstract void dispose();
+
     /**
      * Entry point of any ImGui application. Use it to start the application loop.
      *
@@ -91,4 +97,6 @@ private static void initialize(final Application app) {
         app.configure(config);
         app.init(config);
     }
+
+    public abstract Color getColorBg();
 }

imgui-app/src/main/java/imgui/app/BGFXWindow.java

@@ -20,7 +20,7 @@
 import static org.lwjgl.system.Configuration.GLFW_LIBRARY_NAME;
 import static org.lwjgl.system.MemoryStack.stackPush;
 
-public abstract class BGFXWindow {
+public abstract class BGFXWindow extends Application {
     private final ImGuiImplBGFX imGuiBGFX = new ImGuiImplBGFX();
     private final ImGuiImplGlfw imGuiGlfw = new ImGuiImplGlfw();
 

imgui-app/src/main/java/imgui/app/Window.java

@@ -22,7 +22,7 @@
  * It's recommended to use {@link Application}, but this class could be extended directly as well.
  * When extended, life-cycle methods should be called manually.
  */
-public abstract class Window {
+public abstract class Window extends Application {
 
     private final ImGuiImplGlfw imGuiGlfw = new ImGuiImplGlfw();
     private final ImGuiImplGl3 imGuiGl3 = new ImGuiImplGl3();
@@ -44,7 +44,7 @@ public abstract class Window {
      *
      * @param config configuration object with basic window information
      */
-    protected void init(final Configuration config) {
+    public final void init(final Configuration config) {
         initWindow(config);
         initImGui(config);
         imGuiGlfw.init(handle, true);
@@ -54,7 +54,7 @@ protected void init(final Configuration config) {
     /**
      * Method to dispose all used application resources and destroy its window.
      */
-    protected void dispose() {
+    public final void dispose() {
         imGuiGl3.dispose();
         imGuiGlfw.dispose();
         disposeImGui();