foul-magics/Mage.Client/src/main/java/mage/client/components/HoverButton.java

package mage.client.components;

import mage.client.util.Command;

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.font.FontRenderContext;

/**
 * Image button with hover.
 *
 * @author nantuko
 */
public class HoverButton extends JPanel implements MouseListener {

    private Image image;
    private Image hoverImage;
    private Image disabledImage;
    private Image selectedImage;
    protected Image overlayImage;
    private Rectangle imageSize;
    private Rectangle buttonSize;
    private String text;
    private int textOffsetY = 0;
    private int textOffsetX = -1;
    private Dimension overlayImageSize;

    private boolean isHovered = false;
    private boolean isSelected = false;
    private boolean drawSet = false;
    private String set = null;

    private Command observer = null;
    private Command onHover = null;
    private Color textColor = Color.white;

    static final Font textFont = new Font("Arial", Font.PLAIN, 12);
    static final Font textFontMini = new Font("Arial", Font.PLAIN, 11);
    static final Font textSetFontBoldMini = new Font("Arial", Font.BOLD, 12);
    static final Font textSetFontBold = new Font("Arial", Font.BOLD, 14);
    private boolean useMiniFont = false;

    public HoverButton(String text, Image image, Rectangle size) {
        this(text, image, image, null, image, size);
        if (image == null) {
            throw new IllegalArgumentException("Image can't be null");
        }
    }

    public HoverButton(String text, Image image, Image hover, Image disabled, Rectangle size) {
        this(text, image, hover, null, disabled, size);
    }

    public HoverButton(String text, Image image, Image hover, Image selected, Image disabled, Rectangle size) {
        this.image = image;
        this.hoverImage = hover;
        this.selectedImage = selected;
        this.disabledImage = disabled;
        this.imageSize = size;
        this.text = text;
        setOpaque(false);
        addMouseListener(this);
    }

    public HoverButton(HoverButton button) {
        this(button.text, button.image, button.hoverImage, button.selectedImage, button.disabledImage, button.imageSize);
    }

    @Override
    public void paintComponent(Graphics g) {
        Graphics2D g2d = (Graphics2D) g;
        if (isEnabled()) {
            if (isHovered) {
                g.drawImage(hoverImage, 0, 0, imageSize.width, imageSize.height, this);
                if (text != null) {
                    if (textColor != null) {
                        g2d.setColor(textColor);
                    }
                    if (useMiniFont) {
                        g2d.setFont(textFontMini);
                    } else {
                        g2d.setFont(textFont);
                    }
                    textOffsetX = calculateOffset(g2d);
                    g2d.drawString(text, textOffsetX, textOffsetY);
                }
            } else {
                g.drawImage(image, 0, 0, imageSize.width, imageSize.height, this);
            }
            if (isSelected) {
                if (selectedImage != null) {
                    g.drawImage(selectedImage, 0, 0, imageSize.width, imageSize.height, this);
                } else {
                    System.err.println("No selectedImage for button.");
                }
            }
        } else {
            g.drawImage(disabledImage, 0, 0, imageSize.width, imageSize.height, this);
        }
        if (overlayImage != null) {
            g.drawImage(overlayImage, (imageSize.width - overlayImageSize.width) / 2, 10, this);
        } else if (set != null) {
            // draw only if it is not current tab
            if (!drawSet) {
                g2d.setFont(textSetFontBoldMini);
                g2d.drawString(set, 5, 25);
            }
        }

        if (drawSet && set != null) {
            g2d.setFont(textSetFontBold);
            int w = (int) (getWidth() / 2.0);
            int h = (int) (getHeight() / 2.0);
            int dy = overlayImage == null ? 15 : 25;
            g2d.translate(w + 5, h + dy);
            g2d.rotate(-Math.PI / 2.0);
            g2d.drawString(set, 0, 0);
        }
    }

    private int calculateOffset(Graphics2D g2d) {
        if (textOffsetX == -1) { // calculate once
            FontRenderContext frc = g2d.getFontRenderContext();
            int textWidth = (int) textFont.getStringBounds(text, frc).getWidth();
            if (textWidth > buttonSize.width) {
                g2d.setFont(textFontMini);
                useMiniFont = true;
                frc = g2d.getFontRenderContext();
                textWidth = (int) textFontMini.getStringBounds(text, frc).getWidth();
            }
            textOffsetX = (imageSize.width - textWidth) / 2;
        }
        return textOffsetX;
    }

    public void setTextColor(Color textColor) {
        this.textColor = textColor;
    }

    public void setOverlayImage(Image image) {
        this.overlayImage = image;
        this.overlayImageSize = new Dimension(image.getWidth(null), image.getHeight(null));
    }

    @Override
    public void mouseClicked(MouseEvent e) {
    }

    @Override
    public void mouseEntered(MouseEvent e) {
        isHovered = true;
        this.repaint();
        if (onHover != null) {
            onHover.execute();
        }
    }

    @Override
    public void mouseExited(MouseEvent e) {
        isHovered = false;
        this.repaint();
    }

    @Override
    public void mousePressed(MouseEvent e) {
        if (e.getButton() == MouseEvent.BUTTON1) {
            if (isEnabled() && observer != null) {
                observer.execute();
            }
        }
    }

    @Override
    public void mouseReleased(MouseEvent e) {
    }

    public void setObserver(Command observer) {
        this.observer = observer;
    }

    public void setOnHover(Command onHover) {
        this.onHover = onHover;
    }

    @Override
    public void setBounds(Rectangle r) {
        super.setBounds(r);
        this.textOffsetY = r.height - 2;
        this.buttonSize = r;
    }

    @Override
    public void setBounds(int x, int y, int width, int height) {
        super.setBounds(x, y, width, height);
        this.textOffsetY = height - 2;
        this.buttonSize = new Rectangle(x, y, width, height);
    }

    public boolean isSelected() {
        return isSelected;
    }

    public void setSelected(boolean isSelected) {
        this.isSelected = isSelected;
    }

    public void changeSelected() {
        this.isSelected = !this.isSelected;
    }

    public void setText(String text) {
        this.text = text;
    }

    public void setSet(String set) {
        this.set = set;
    }

    public void drawSet() {
        this.drawSet = true;
    }

    public void update(String text, Image image, Image hover, Image selected, Image disabled, Rectangle size) {
        this.image = image;
        this.hoverImage = hover;
        this.selectedImage = selected;
        this.disabledImage = disabled;
        this.imageSize = size;
        this.text = text;
        repaint();
    }

    public void execute() {
        if (isEnabled() && observer != null) {
            observer.execute();
        }
    }
}