net.alantea.swing.vml.widgets.ButtonHandler 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.AbstractButton;
import javax.swing.ImageIcon;
import javax.swing.JButton;

import net.alantea.horizon.message.Messenger;
import net.alantea.liteprops.Property;
import net.alantea.swing.ui.ButtonUI;
import net.alantea.swing.vml.BaseSwingHandler;
import net.alantea.utils.exception.LntException;
import net.alantea.viewml.VmlAction;
import net.alantea.viewml.VmlException;
import net.alantea.viewml.annotations.VAttribute;
import net.alantea.viewml.annotations.VElement;
import net.alantea.viewml.internal.ActionsLoader;

@VElement("button")
public class ButtonHandler extends BaseSwingHandler
{
   private ImageIcon icon;
   private VmlAction action;
   private String message;

   private Property label = new Property<>();
   
   public ButtonHandler()
   {
      super(new JButton());
      init();
   }

   protected ButtonHandler(JButton  target)
   {
      super(target);
      init();
   }

   private void init()
   {

      ((JButton)getComponent()).setUI(new ButtonUI());
      label.addListener((o, n) -> setLabel(n));
      
      getComponent().addComponentListener(new ButtonHandlerResizeListener());
      ((AbstractButton) getComponent()).addActionListener((e) ->
      {
         if (action != null)
         {
            action.invoke();
         }
         if (message != null)
         {
            Messenger.sendMessage(getComponent(), message, null);
         }
      });
   }

   @VAttribute("action")
   private void setAction(String text)
   {
      try
      {
         action = ActionsLoader.getAction(text);
      }
      catch (VmlException e)
      {
         new LntException("Error setting action", e);
      }
   }

   @VAttribute("message")
   private void setMessage(String text)
   {
      this.message = text;
   }

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

   @VAttribute("tooltip")
   private void setTooltip(String text)
   {
      ((AbstractButton) getComponent()).setToolTipText(text);
   }

   @VAttribute("icon")
   private void setIcon(String text)
   {
      icon = new ImageIcon(this.getClass().getResource((text)));
      ((JButton) 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;
  }
   
   class ButtonHandlerResizeListener extends ComponentAdapter
   {
      public void componentResized(ComponentEvent e)
      {
         JButton label = (JButton)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);
         ((JButton) 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));
      }
   }
}