Create ScreenWidget - a screen aware parent of root widget

api/src/main/java/com/bartlomiejpluta/base/api/game/gui/base/Widget.java

@@ -5,6 +5,8 @@ import com.bartlomiejpluta.base.api.game.screen.Screen;
 public interface Widget {
    Widget getParent();
 
+   void setParent(Widget parent);
+
    float getX();
 
    float getY();

api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/Component.java

@@ -98,6 +98,7 @@ public abstract class Component implements Widget {
       return parent;
    }
 
+   @Override
    public void setParent(Widget parent) {
       this.parent = parent;
    }

engine/src/main/java/com/bartlomiejpluta/base/engine/gui/render/NanoVGGUI.java

@@ -9,8 +9,8 @@ import com.bartlomiejpluta.base.api.game.screen.Screen;
 import com.bartlomiejpluta.base.api.internal.render.ShaderManager;
 import com.bartlomiejpluta.base.engine.error.AppException;
 import com.bartlomiejpluta.base.engine.gui.manager.FontManager;
+import com.bartlomiejpluta.base.engine.gui.widget.ScreenWidget;
 import lombok.Getter;
-import lombok.Setter;
 import org.lwjgl.nanovg.NVGColor;
 
 import java.util.HashSet;
@@ -24,8 +24,7 @@ import static org.lwjgl.system.MemoryUtil.NULL;
 public class NanoVGGUI implements GUI {
    private long context;
 
-   @Setter
+   private ScreenWidget screenWidget;
-   private Widget root;
 
    private NVGColor fillColor;
    private NVGColor strokeColor;
@@ -41,25 +40,36 @@ public class NanoVGGUI implements GUI {
    public void init(Screen screen) {
       context = nvgCreate(NVG_ANTIALIAS | NVG_STENCIL_STROKES);
 
+      if (context == NULL) {
+         throw new AppException("Could not init NanoVG");
+      }
+
+      screenWidget = new ScreenWidget(screen);
+
       fillColor = NVGColor.create();
       strokeColor = NVGColor.create();
-
-      if (context == NULL) {
-         throw new AppException("Could not onCreate NanoVG");
-      }
    }
 
    @Override
    public void render(Screen screen, Camera camera, ShaderManager shaderManager) {
       nvgBeginFrame(context, screen.getWidth(), screen.getHeight(), 1);
 
-      if (root != null) {
+      screenWidget.draw(screen, this);
-         root.draw(screen, this);
-      }
 
       nvgEndFrame(context);
    }
 
+   @Override
+   public Widget getRoot() {
+      return screenWidget.getRoot();
+   }
+
+   @Override
+   public void setRoot(Widget root) {
+      screenWidget.setRoot(root);
+      root.setParent(screenWidget);
+   }
+
    @Override
    public void beginPath() {
       nvgBeginPath(context);

engine/src/main/java/com/bartlomiejpluta/base/engine/gui/widget/ScreenWidget.java

@@ -0,0 +1,230 @@
+package com.bartlomiejpluta.base.engine.gui.widget;
+
+import com.bartlomiejpluta.base.api.game.gui.base.GUI;
+import com.bartlomiejpluta.base.api.game.gui.base.SizeMode;
+import com.bartlomiejpluta.base.api.game.gui.base.Widget;
+import com.bartlomiejpluta.base.api.game.screen.Screen;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.Setter;
+
+@Setter
+@Getter
+@RequiredArgsConstructor
+public class ScreenWidget implements Widget {
+   private final Screen screen;
+
+   private Widget root;
+
+   @Override
+   public float getWidth() {
+      return screen.getWidth();
+   }
+
+   @Override
+   public float getHeight() {
+      return screen.getHeight();
+   }
+
+   @Override
+   public Widget getParent() {
+      return null;
+   }
+
+   @Override
+   public void setParent(Widget parent) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public float getX() {
+      return 0;
+   }
+
+   @Override
+   public float getY() {
+      return 0;
+   }
+
+   @Override
+   public void setX(float x) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setY(float y) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setPosition(float x, float y) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setWidth(float width) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setHeight(float height) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setSize(float width, float height) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public SizeMode getWidthMode() {
+      return SizeMode.MATCH_PARENT;
+   }
+
+   @Override
+   public void setWidthMode(SizeMode mode) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public SizeMode getHeightMode() {
+      return SizeMode.MATCH_PARENT;
+   }
+
+   @Override
+   public void setHeightMode(SizeMode mode) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setSizeMode(SizeMode widthMode, SizeMode heightMode) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setMargin(float top, float right, float bottom, float left) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setMargin(float top, float rightLeft, float bottom) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setMargin(float topBottom, float rightLeft) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setMargin(float all) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setMarginTop(float margin) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setMarginRight(float margin) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setMarginBottom(float margin) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setMarginLeft(float margin) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public float getMarginTop() {
+      return 0;
+   }
+
+   @Override
+   public float getMarginRight() {
+      return 0;
+   }
+
+   @Override
+   public float getMarginBottom() {
+      return 0;
+   }
+
+   @Override
+   public float getMarginLeft() {
+      return 0;
+   }
+
+   @Override
+   public void setPadding(float top, float right, float bottom, float left) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setPadding(float top, float rightLeft, float bottom) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setPadding(float topBottom, float rightLeft) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setPadding(float all) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setPaddingTop(float padding) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setPaddingRight(float padding) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setPaddingBottom(float padding) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void setPaddingLeft(float padding) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public float getPaddingTop() {
+      return 0;
+   }
+
+   @Override
+   public float getPaddingRight() {
+      return 0;
+   }
+
+   @Override
+   public float getPaddingBottom() {
+      return 0;
+   }
+
+   @Override
+   public float getPaddingLeft() {
+      return 0;
+   }
+
+   @Override
+   public void draw(Screen screen, GUI gui) {
+      if (root != null) {
+         root.draw(screen, gui);
+      }
+   }
+}