UI Widgets

public interface ResizableWidget {
    void resize(int width, int height);
}

public class ResizableWidgetCollection implements ResizeHandler, Iterable<ResizableWidget> {
    // Widget management
    public void add(ResizableWidget widget);
    public boolean remove(ResizableWidget widget);
    public void clear();
    public int size();
    
    // Resize handling
    public void onResize(ResizeEvent event);
    
    // Iteration support
    public Iterator<ResizableWidget> iterator();
    
    // Manual resize trigger
    public void resize(int width, int height);
}

public class ProgressBar extends Widget implements ResizableWidget {
    // Progress control
    public void setValue(float value); // 0.0 to 1.0
    public float getValue();
    
    // Appearance
    public void setVisible(boolean visible);
    public boolean isVisible();
    public void setAnimated(boolean animated);
    public boolean isAnimated();
    
    // Styling
    public void setProgressColor(String color);
    public void setBackgroundColor(String color);
    public void setBorderColor(String color);
    public void setHeight(int height);
    
    // Text display
    public void setShowText(boolean showText);
    public boolean isShowText();
    public void setTextFormat(String format); // e.g., "{0}%" for percentage
    
    // ResizableWidget implementation
    public void resize(int width, int height);
    
    // Widget positioning
    public void setPosition(int x, int y);
    public void setSize(int width, int height);
    
    // Constructors
    public ProgressBar();
    public ProgressBar(int width, int height);
}

public class TextInputDialogBox extends DialogBox {
    // Dialog display
    public void show(String title, String text, TextInputListener listener);
    public void show(String title, String text, String hint, TextInputListener listener);
    public void hide();
    
    // Dialog configuration
    public void setModal(boolean modal);
    public boolean isModal();
    public void setAnimationEnabled(boolean enabled);
    public boolean isAnimationEnabled();
    
    // Input validation
    public void setValidator(InputValidator validator);
    public InputValidator getValidator();
    public void setMaxLength(int maxLength);
    public int getMaxLength();
    
    // Styling
    public void setDialogStyle(String styleName);
    public void setButtonText(String okText, String cancelText);
    
    // Event handling
    public interface TextInputListener {
        void input(String text);
        void canceled();
    }
    
    public interface InputValidator {
        boolean isValid(String input);
        String getErrorMessage();
    }
    
    // Constructors
    public TextInputDialogBox();
    public TextInputDialogBox(boolean autoHide);
}

public class PlaceholderTextBox extends TextBox {
    // Placeholder functionality
    public void setPlaceholder(String placeholder);
    public String getPlaceholder();
    
    // Enhanced text input
    public void selectAll();
    public void setSelectionRange(int start, int length);
    public String getSelectedText();
    
    // Input filtering
    public void setInputFilter(InputFilter filter);
    public InputFilter getInputFilter();
    
    // Event handling
    public void addValueChangeHandler(ValueChangeHandler<String> handler);
    public void addKeyUpHandler(KeyUpHandler handler);
    public void addFocusHandler(FocusHandler handler);
    public void addBlurHandler(BlurHandler handler);
    
    // Styling enhancements
    public void setErrorStyle(boolean error);
    public boolean hasErrorStyle();
    
    public interface InputFilter {
        boolean accept(char character);
        String filter(String input);
    }
    
    // Constructors
    public PlaceholderTextBox();
    public PlaceholderTextBox(String placeholder);
}

public class LoadingScreen implements Screen {
    private ProgressBar progressBar;
    private ResizableWidgetCollection widgets;
    private Stage stage;
    private Label statusLabel;
    
    public LoadingScreen() {
        stage = new Stage();
        widgets = new ResizableWidgetCollection();
        
        // Create progress bar
        progressBar = new ProgressBar(400, 30);
        progressBar.setProgressColor("#00ff00");
        progressBar.setBackgroundColor("#333333");
        progressBar.setBorderColor("#666666");
        progressBar.setShowText(true);
        progressBar.setTextFormat("{0}%");
        progressBar.setAnimated(true);
        
        // Add to widget collection for automatic resizing
        widgets.add(progressBar);
        
        // Create status label
        statusLabel = new Label("Loading...", new Label.LabelStyle());
        
        // Position widgets
        layoutWidgets();
        
        // Handle window resize
        Gdx.graphics.setResizeCallback(new Graphics.ResizeCallback() {
            @Override
            public void onResize(int width, int height) {
                widgets.resize(width, height);
                layoutWidgets();
            }
        });
    }
    
    @Override
    public void show() {
        Gdx.input.setInputProcessor(stage);
    }
    
    @Override
    public void render(float delta) {
        // Update progress (example: based on asset loading)
        updateProgress();
        
        // Clear screen
        Gdx.gl.glClearColor(0.1f, 0.1f, 0.1f, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        
        // Render UI
        stage.act(delta);
        stage.draw();
    }
    
    private void updateProgress() {
        // Example: Update based on preloader state
        if (MyGame.getPreloader() != null) {
            Preloader.PreloaderState state = MyGame.getPreloader().update();
            float progress = state.getProgress();
            
            progressBar.setValue(progress);
            
            // Update status text
            if (progress < 0.3f) {
                statusLabel.setText("Loading graphics...");
            } else if (progress < 0.6f) {
                statusLabel.setText("Loading audio...");
            } else if (progress < 0.9f) {
                statusLabel.setText("Loading data...");
            } else if (progress < 1.0f) {
                statusLabel.setText("Finalizing...");
            } else {
                statusLabel.setText("Complete!");
            }
        }
    }
    
    private void layoutWidgets() {
        int screenWidth = Gdx.graphics.getWidth();
        int screenHeight = Gdx.graphics.getHeight();
        
        // Center progress bar
        int barX = (screenWidth - 400) / 2;
        int barY = (screenHeight - 30) / 2;
        progressBar.setPosition(barX, barY);
        
        // Position status label above progress bar
        statusLabel.setPosition(barX, barY + 50);
    }
    
    // ... other Screen methods
}

public class TextInputManager {
    private TextInputDialogBox currentDialog;
    
    public void showNameInput(TextInputListener listener) {
        if (currentDialog != null) {
            currentDialog.hide();
        }
        
        currentDialog = new TextInputDialogBox();
        currentDialog.setModal(true);
        currentDialog.setAnimationEnabled(true);
        currentDialog.setButtonText("OK", "Cancel");
        
        // Set up validation
        currentDialog.setValidator(new TextInputDialogBox.InputValidator() {
            @Override
            public boolean isValid(String input) {
                return input != null && input.trim().length() >= 2 && input.length() <= 20;
            }
            
            @Override
            public String getErrorMessage() {
                return "Name must be 2-20 characters long";
            }
        });
        
        currentDialog.show("Enter Your Name", "", "Your name here", new TextInputDialogBox.TextInputListener() {
            @Override
            public void input(String text) {
                currentDialog = null;
                if (listener != null) {
                    listener.input(text.trim());
                }
            }
            
            @Override
            public void canceled() {
                currentDialog = null;
                if (listener != null) {
                    listener.canceled();
                }
            }
        });
    }
    
    public void showScoreInput(int currentHighScore, TextInputListener listener) {
        if (currentDialog != null) {
            currentDialog.hide();
        }
        
        currentDialog = new TextInputDialogBox();
        currentDialog.setMaxLength(10);
        
        // Numeric validation
        currentDialog.setValidator(new TextInputDialogBox.InputValidator() {
            @Override
            public boolean isValid(String input) {
                try {
                    int score = Integer.parseInt(input);
                    return score > currentHighScore;
                } catch (NumberFormatException e) {
                    return false;
                }
            }
            
            @Override
            public String getErrorMessage() {
                return "Enter a score higher than " + currentHighScore;
            }
        });
        
        currentDialog.show("New High Score!", "", "Enter score", listener);
    }
    
    public void showCustomDialog(String title, String defaultText, String hint, 
                                TextInputDialogBox.InputValidator validator, 
                                TextInputListener listener) {
        if (currentDialog != null) {
            currentDialog.hide();
        }
        
        currentDialog = new TextInputDialogBox();
        if (validator != null) {
            currentDialog.setValidator(validator);
        }
        
        currentDialog.show(title, defaultText, hint, listener);
    }
    
    public void hideCurrentDialog() {
        if (currentDialog != null) {
            currentDialog.hide();
            currentDialog = null;
        }
    }
    
    public boolean isDialogShowing() {
        return currentDialog != null;
    }
}

public class GameTextInput extends PlaceholderTextBox {
    private InputType inputType;
    
    public enum InputType {
        ALPHA_ONLY,
        NUMERIC_ONLY,
        ALPHANUMERIC,
        EMAIL,
        PASSWORD,
        CUSTOM
    }
    
    public GameTextInput(InputType type) {
        super();
        this.inputType = type;
        setupInputFilter();
        setupStyling();
    }
    
    public GameTextInput(String placeholder, InputType type) {
        super(placeholder);
        this.inputType = type;
        setupInputFilter();
        setupStyling();
    }
    
    private void setupInputFilter() {
        switch (inputType) {
            case ALPHA_ONLY:
                setInputFilter(new InputFilter() {
                    @Override
                    public boolean accept(char c) {
                        return Character.isLetter(c) || Character.isWhitespace(c);
                    }
                    
                    @Override
                    public String filter(String input) {
                        return input.replaceAll("[^a-zA-Z\\s]", "");
                    }
                });
                break;
                
            case NUMERIC_ONLY:
                setInputFilter(new InputFilter() {
                    @Override
                    public boolean accept(char c) {
                        return Character.isDigit(c) || c == '.' || c == '-';
                    }
                    
                    @Override
                    public String filter(String input) {
                        return input.replaceAll("[^0-9.-]", "");
                    }
                });
                break;
                
            case ALPHANUMERIC:
                setInputFilter(new InputFilter() {
                    @Override
                    public boolean accept(char c) {
                        return Character.isLetterOrDigit(c) || Character.isWhitespace(c);
                    }
                    
                    @Override
                    public String filter(String input) {
                        return input.replaceAll("[^a-zA-Z0-9\\s]", "");
                    }
                });
                break;
                
            case EMAIL:
                setInputFilter(new InputFilter() {
                    @Override
                    public boolean accept(char c) {
                        return Character.isLetterOrDigit(c) || c == '@' || c == '.' || c == '_' || c == '-';
                    }
                    
                    @Override
                    public String filter(String input) {
                        return input.replaceAll("[^a-zA-Z0-9@._-]", "").toLowerCase();
                    }
                });
                break;
        }
    }
    
    private void setupStyling() {
        // Add focus/blur styling
        addFocusHandler(new FocusHandler() {
            @Override
            public void onFocus(FocusEvent event) {
                getElement().getStyle().setBorderColor("#4CAF50");
                getElement().getStyle().setProperty("boxShadow", "0 0 5px rgba(76, 175, 80, 0.5)");
            }
        });
        
        addBlurHandler(new BlurHandler() {
            @Override
            public void onBlur(BlurEvent event) {
                getElement().getStyle().setBorderColor("#ccc");
                getElement().getStyle().setProperty("boxShadow", "none");
                
                // Validate input on blur
                validateInput();
            }
        });
        
        // Real-time validation
        addValueChangeHandler(new ValueChangeHandler<String>() {
            @Override
            public void onValueChange(ValueChangeEvent<String> event) {
                validateInput();
            }
        });
    }
    
    private void validateInput() {
        String value = getText();
        boolean isValid = true;
        
        switch (inputType) {
            case EMAIL:
                isValid = value.matches("^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,}$");
                break;
            case NUMERIC_ONLY:
                try {
                    Double.parseDouble(value);
                } catch (NumberFormatException e) {
                    isValid = !value.isEmpty();
                }
                break;
        }
        
        setErrorStyle(!isValid);
    }
    
    public boolean isValidInput() {
        validateInput();
        return !hasErrorStyle();
    }
    
    public String getValidatedText() {
        if (isValidInput()) {
            return getText();
        }
        return null;
    }
}

public class ResponsiveLayoutManager {
    private ResizableWidgetCollection widgets;
    private Map<ResizableWidget, LayoutConstraints> constraints;
    
    public static class LayoutConstraints {
        public float percentX, percentY; // Position as percentage of screen
        public float percentWidth, percentHeight; // Size as percentage of screen
        public int minWidth, minHeight; // Minimum pixel sizes
        public int maxWidth, maxHeight; // Maximum pixel sizes
        public Anchor anchor; // Anchor point for positioning
        
        public enum Anchor {
            TOP_LEFT, TOP_CENTER, TOP_RIGHT,
            MIDDLE_LEFT, MIDDLE_CENTER, MIDDLE_RIGHT,
            BOTTOM_LEFT, BOTTOM_CENTER, BOTTOM_RIGHT
        }
    }
    
    public ResponsiveLayoutManager() {
        widgets = new ResizableWidgetCollection();
        constraints = new HashMap<>();
        
        // Listen for window resize events
        Window.addResizeHandler(new ResizeHandler() {
            @Override
            public void onResize(ResizeEvent event) {
                layoutAllWidgets();
            }
        });
    }
    
    public void addWidget(ResizableWidget widget, LayoutConstraints layoutConstraints) {
        widgets.add(widget);
        constraints.put(widget, layoutConstraints);
        layoutWidget(widget, layoutConstraints);
    }
    
    public void removeWidget(ResizableWidget widget) {
        widgets.remove(widget);
        constraints.remove(widget);
    }
    
    public void layoutAllWidgets() {
        for (ResizableWidget widget : widgets) {
            LayoutConstraints constraint = constraints.get(widget);
            if (constraint != null) {
                layoutWidget(widget, constraint);
            }
        }
    }
    
    private void layoutWidget(ResizableWidget widget, LayoutConstraints constraint) {
        int screenWidth = Gdx.graphics.getWidth();
        int screenHeight = Gdx.graphics.getHeight();
        
        // Calculate size
        int width = (int)(screenWidth * constraint.percentWidth);
        int height = (int)(screenHeight * constraint.percentHeight);
        
        // Apply size constraints
        width = Math.max(constraint.minWidth, Math.min(constraint.maxWidth, width));
        height = Math.max(constraint.minHeight, Math.min(constraint.maxHeight, height));
        
        // Calculate position based on anchor
        int x = calculateAnchoredX(screenWidth, width, constraint);
        int y = calculateAnchoredY(screenHeight, height, constraint);
        
        // Apply layout
        widget.resize(width, height);
        
        // Set position if widget supports it
        if (widget instanceof Widget) {
            ((Widget) widget).setPixelSize(width, height);
            // Position setting depends on widget implementation
        }
    }
    
    private int calculateAnchoredX(int screenWidth, int widgetWidth, LayoutConstraints constraint) {
        int baseX = (int)(screenWidth * constraint.percentX);
        
        switch (constraint.anchor) {
            case TOP_LEFT:
            case MIDDLE_LEFT:
            case BOTTOM_LEFT:
                return baseX;
            case TOP_CENTER:
            case MIDDLE_CENTER:
            case BOTTOM_CENTER:
                return baseX - widgetWidth / 2;
            case TOP_RIGHT:
            case MIDDLE_RIGHT:
            case BOTTOM_RIGHT:
                return baseX - widgetWidth;
            default:
                return baseX;
        }
    }
    
    private int calculateAnchoredY(int screenHeight, int widgetHeight, LayoutConstraints constraint) {
        int baseY = (int)(screenHeight * constraint.percentY);
        
        switch (constraint.anchor) {
            case TOP_LEFT:
            case TOP_CENTER:
            case TOP_RIGHT:
                return baseY;
            case MIDDLE_LEFT:
            case MIDDLE_CENTER:
            case MIDDLE_RIGHT:
                return baseY - widgetHeight / 2;
            case BOTTOM_LEFT:
            case BOTTOM_CENTER:
            case BOTTOM_RIGHT:
                return baseY - widgetHeight;
            default:
                return baseY;
        }
    }
    
    // Predefined constraint builders
    public static LayoutConstraints centerScreen(float percentWidth, float percentHeight) {
        LayoutConstraints constraints = new LayoutConstraints();
        constraints.percentX = 0.5f;
        constraints.percentY = 0.5f;
        constraints.percentWidth = percentWidth;
        constraints.percentHeight = percentHeight;
        constraints.anchor = LayoutConstraints.Anchor.MIDDLE_CENTER;
        constraints.minWidth = 100;
        constraints.minHeight = 50;
        constraints.maxWidth = Integer.MAX_VALUE;
        constraints.maxHeight = Integer.MAX_VALUE;
        return constraints;
    }
    
    public static LayoutConstraints bottomCenter(float percentWidth, float height) {
        LayoutConstraints constraints = new LayoutConstraints();
        constraints.percentX = 0.5f;
        constraints.percentY = 0.1f;
        constraints.percentWidth = percentWidth;
        constraints.percentHeight = 0; // Fixed height
        constraints.anchor = LayoutConstraints.Anchor.BOTTOM_CENTER;
        constraints.minWidth = 200;
        constraints.minHeight = (int)height;
        constraints.maxWidth = Integer.MAX_VALUE;
        constraints.maxHeight = (int)height;
        return constraints;
    }
}

// Widgets are designed for web browser environments
public class BrowserIntegrationHelper {
    
    public static void configureForMobile() {
        // Optimize widgets for mobile browsers
        ProgressBar.setDefaultHeight(40); // Larger for touch
        TextInputDialogBox.setDefaultAnimationDuration(200); // Faster for mobile
        
        // Handle virtual keyboard
        PlaceholderTextBox.addGlobalFocusHandler(new FocusHandler() {
            @Override
            public void onFocus(FocusEvent event) {
                // Scroll input into view when virtual keyboard appears
                Element element = event.getSource().getElement();
                element.scrollIntoView();
            }
        });
    }
    
    public static void configureForDesktop() {
        // Optimize for desktop browsers
        ProgressBar.setDefaultHeight(24); // Standard height
        TextInputDialogBox.setDefaultAnimationDuration(300); // Smooth animations
        
        // Enable advanced keyboard shortcuts
        configureKeyboardShortcuts();
    }
    
    private static void configureKeyboardShortcuts() {
        // Add Ctrl+A, Ctrl+C, Ctrl+V support for text inputs
        // This is handled automatically by PlaceholderTextBox
    }
}