Make IWidget#resizer return nonnull

src/main/java/com/cleanroommc/modularui/api/widget/IWidget.java

@@ -215,6 +215,8 @@ default IWidget flexBuilder(Consumer<Flex> builder) {
     /**
      * @return resizer of this widget
      */
+    @NotNull
+    @Override
     IResizeable resizer();
 
     /**

src/main/java/com/cleanroommc/modularui/widget/EmptyWidget.java

@@ -16,7 +16,7 @@
 public class EmptyWidget implements IWidget {
 
     private final Area area = new Area();
-    private Flex flex;
+    private final Flex flex = new Flex(this);
     private IWidget parent;
 
     @Override
@@ -99,14 +99,11 @@ public ModularGuiContext getContext() {
 
     @Override
     public Flex flex() {
-        if (this.flex == null) {
-            this.flex = new Flex(this);
-        }
         return this.flex;
     }
 
     @Override
-    public @Nullable IResizeable resizer() {
+    public @NotNull IResizeable resizer() {
         return this.flex;
     }
 

src/main/java/com/cleanroommc/modularui/widget/Widget.java

@@ -346,6 +346,7 @@ public Flex flex() {
         return this.flex;
     }
 
+    @NotNull
     @Override
     public IResizeable resizer() {
         return this.resizer;

src/main/java/com/cleanroommc/modularui/widget/WidgetTree.java

@@ -245,23 +245,17 @@ public static void resize(IWidget parent) {
     }
 
     private static boolean resizeWidget(IWidget widget, boolean init) {
-        boolean result = false, alreadyCalculated = false;
+        boolean alreadyCalculated = false;
         // first try to resize this widget
         IResizeable resizer = widget.resizer();
-        if (resizer != null) {
-            if (init) {
-                widget.beforeResize();
-                resizer.initResizing();
-            } else {
-                // if this is not the first time check if this widget is already resized
-                alreadyCalculated = resizer.isFullyCalculated();
-            }
-            result = alreadyCalculated || resizer.resize(widget);
-        } else if (!init) {
-            // weird case that is not supposed to happen
-            result = true;
-            alreadyCalculated = true;
+        if (init) {
+            widget.beforeResize();
+            resizer.initResizing();
+        } else {
+            // if this is not the first time check if this widget is already resized
+            alreadyCalculated = resizer.isFullyCalculated();
         }
+        boolean result = alreadyCalculated || resizer.resize(widget);
 
         GuiAxis expandAxis = widget instanceof IExpander expander ? expander.getExpandAxis() : null;
         // now resize all children and collect children which could not be fully calculated
@@ -282,7 +276,7 @@ private static boolean resizeWidget(IWidget widget, boolean init) {
             }
 
             // post resize this widget if possible
-            if (resizer != null && !result) {
+            if (!result) {
                 result = resizer.postResize(widget);
             }
 
@@ -303,10 +297,7 @@ private static boolean resizeWidget(IWidget widget, boolean init) {
 
     public static void applyPos(IWidget parent) {
         WidgetTree.foreachChildBFS(parent, child -> {
-            IResizeable resizer = child.resizer();
-            if (resizer != null) {
-                resizer.applyPos(child);
-            }
+            child.resizer().applyPos(child);
             return true;
         }, true);
     }

src/main/java/com/cleanroommc/modularui/widgets/TextWidget.java

@@ -50,9 +50,9 @@ private TextRenderer simulate(float maxWidth) {
     @Override
     public int getDefaultHeight() {
         float maxWidth;
-        if (resizer() != null && resizer().isWidthCalculated()) {
+        if (resizer().isWidthCalculated()) {
             maxWidth = getArea().width + this.scale;
-        } else if (getParent().resizer() != null && getParent().resizer().isWidthCalculated()) {
+        } else if (getParent().resizer().isWidthCalculated()) {
             maxWidth = getParent().getArea().width + this.scale;
         } else {
             maxWidth = getScreen().getScreenArea().width;
@@ -65,7 +65,7 @@ public int getDefaultHeight() {
     @Override
     public int getDefaultWidth() {
         float maxWidth = getScreen().getScreenArea().width;
-        if (getParent().resizer() != null && getParent().resizer().isWidthCalculated()) {
+        if (getParent().resizer().isWidthCalculated()) {
             maxWidth = getParent().getArea().width;
         }
         TextRenderer renderer = simulate(maxWidth);