net.alantea.swing.vml.widgets.LabelHandler Maven / Gradle / Ivy

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package net.alantea.swing.vml.widgets;

import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.image.BufferedImage;

import javax.swing.ImageIcon;
import javax.swing.JLabel;

import net.alantea.liteprops.Property;
import net.alantea.swing.vml.BaseSwingHandler;
import net.alantea.viewml.annotations.VAttribute;
import net.alantea.viewml.annotations.VElement;

@VElement("label")
public class LabelHandler extends BaseSwingHandler
{
   private ImageIcon icon;
   private Property label = new Property<>();

   public LabelHandler()
   {
      super(new JLabel());
      init();
   }

   protected LabelHandler(JLabel  target)
   {
      super(target);
      init();
   }

   private void init()
   {
      label.addListener((o, n) -> setText(n));
      
      getComponent().addComponentListener(new ComponentAdapter()
      {
         public void componentResized(ComponentEvent e)
         {
            JLabel label = (JLabel)getComponent();
            int compWidth = label.getWidth();
            int compHeight = label.getHeight();
            
            if ((compWidth <= 0) || (compHeight <= 0))
            {
               return;
            }
            
            // Recalculate the image
            int iconWidth = (icon == null) ? 0 : icon.getIconWidth();
            int iconHeight = (icon == null) ? 0 : icon.getIconHeight();
            
            Image img = getScaledImage(icon, (iconWidth * compHeight) / iconHeight, compHeight);
            ((JLabel) getComponent()).setIcon(new ImageIcon(img));

            // Recalculate the text font
            int availableWidth = compWidth - ((icon == null) ? 0 : img.getWidth(null));
            int availableHeight = compHeight;
            
            Font labelFont = label.getFont();
            String labelText = label.getText();

            int stringWidth = label.getFontMetrics(labelFont).stringWidth(labelText);

            // Find out how much the font can grow in width.
            double widthRatio = (double)availableWidth / (double)stringWidth;

            int newFontSize = (int)(labelFont.getSize() * widthRatio);

            // Pick a new font size so it will not be larger than the height of label.
            int fontSizeToUse = Math.min(newFontSize, availableHeight);

            // Set the label's font size to the newly determined size.
            label.setFont(new Font(labelFont.getName(), labelFont.getStyle(), fontSizeToUse));
         }

      });
   }

   @VAttribute("text")
   private void setText(String text)
   {
      ((JLabel) getComponent()).setText(text);
   }

   @VAttribute("icon")
   private void setIcon(String text)
   {
      icon = new ImageIcon(this.getClass().getResource((text)));
      ((JLabel) getComponent()).setIcon(icon);
   }
   
   private Image getScaledImage(ImageIcon srcImg, int w, int h)
   {
      BufferedImage resizedImg = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
      Graphics2D g2 = resizedImg.createGraphics();

      g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
      g2.drawImage(srcImg.getImage(), 0, 0, w, h, null);
      g2.dispose();

      return resizedImg;
  }
}