Feat[controls]: implement control layout sanitizer

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/customcontrols/ControlLayout.java

@@ -80,6 +80,10 @@ public void loadLayout(String jsonPath) throws IOException, JsonSyntaxException
 	}
 
 	public void loadLayout(CustomControls controlLayout) {
+		boolean sanitizedModified = false;
+		if(controlLayout != null) {
+			sanitizedModified = LayoutSanitizer.sanitizeLayout(controlLayout);
+		}
 		if(mActionRow == null){
 			mActionRow = new ActionRow(getContext());
 			addView(mActionRow);
@@ -118,7 +122,7 @@ public void loadLayout(CustomControls controlLayout) {
 
 		mLayout.scaledAt = LauncherPreferences.PREF_BUTTONSIZE;
 
-		setModified(false);
+		setModified(sanitizedModified);
 		mButtons = null;
 		getButtonChildren(); // Force refresh
 	} // loadLayout

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/customcontrols/LayoutSanitizer.java

@@ -0,0 +1,52 @@
+package net.kdt.pojavlaunch.customcontrols;
+
+import java.util.Iterator;
+import java.util.List;
+
+public class LayoutSanitizer {
+
+    // Maybe add more conditions here later?
+    private static boolean isInvalidFormula(String formula) {
+        return formula.contains("Infinity");
+    }
+
+    private static boolean isSaneData(ControlData controlData) {
+        if(controlData.getWidth() == 0 || controlData.getHeight() == 0) return false;
+        if(isInvalidFormula(controlData.dynamicX) || isInvalidFormula(controlData.dynamicY)) return false;
+        return true;
+    }
+
+    private static ControlData getControlData(Object dataEntry) {
+        if(dataEntry instanceof ControlData) {
+            return (ControlData) dataEntry;
+        }else if(dataEntry instanceof ControlDrawerData) {
+            return ((ControlDrawerData) dataEntry).properties;
+        }else throw new RuntimeException("Encountered wrong type during ControlData sanitization");
+    }
+
+    private static boolean sanitizeList(List<?> controlDataList) {
+        boolean madeChanges = false;
+        Iterator<?> iterator = controlDataList.iterator();
+        while(iterator.hasNext()) {
+            ControlData controlData = getControlData(iterator.next());
+            if(!isSaneData(controlData)) {
+                madeChanges = true;
+                iterator.remove();
+            }
+        }
+        return madeChanges;
+    }
+
+    /**
+     * Check all buttons in a control layout and ensure they're sane (contain values valid enough
+     * to be displayed properly). Removes any buttons deemed not sane.
+     * @param controls the original control layout.
+     * @return whether the sanitization process made any changes to the layout
+     */
+    public static boolean sanitizeLayout(CustomControls controls) {
+        boolean madeChanges = sanitizeList(controls.mControlDataList);
+        if(sanitizeList(controls.mDrawerDataList)) madeChanges = true;
+        if(sanitizeList(controls.mJoystickDataList)) madeChanges = true;
+        return madeChanges;
+    }
+}