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Orbit, a versatile image analysis software for biological image-based quantification
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/**
 * $ $ License.
 *
 * Copyright $ L2FProd.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.l2fprod.common.swing.plaf.basic;

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Cursor;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.AbstractButton;
import javax.swing.ButtonModel;
import javax.swing.JComponent;
import javax.swing.JToolBar;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.basic.BasicButtonUI;
import javax.swing.plaf.basic.BasicGraphicsUtils;
import javax.swing.plaf.basic.BasicHTML;
import javax.swing.text.View;

/**
 * Basic implementation of the JLinkButton UI. 

 */
public class BasicLinkButtonUI extends BasicButtonUI {

  public static ComponentUI createUI(JComponent c) {
    return new BasicLinkButtonUI();
  }

  private static Rectangle viewRect = new Rectangle();
  private static Rectangle textRect = new Rectangle();
  private static Rectangle iconRect = new Rectangle();
  private static MouseListener handCursorListener = new HandCursor();
  
  protected int dashedRectGapX;
  protected int dashedRectGapY;
  protected int dashedRectGapWidth;
  protected int dashedRectGapHeight;
  private Color focusColor;

  protected void installDefaults(AbstractButton b) {
    super.installDefaults(b);

    b.setOpaque(false);
    b.setBorderPainted(false);
    b.setRolloverEnabled(true);

    dashedRectGapX = UIManager.getInt("ButtonUI.dashedRectGapX");
    dashedRectGapY = UIManager.getInt("ButtonUI.dashedRectGapY");
    dashedRectGapWidth = UIManager.getInt("ButtonUI.dashedRectGapWidth");
    dashedRectGapHeight = UIManager.getInt("ButtonUI.dashedRectGapHeight");
    focusColor = UIManager.getColor("ButtonUI.focus");

    b.setHorizontalAlignment(AbstractButton.LEFT);
  }

  protected void installListeners(AbstractButton b) {
    super.installListeners(b);
    b.addMouseListener(handCursorListener);
  }
  
  protected void uninstallListeners(AbstractButton b) {
    super.uninstallListeners(b);
    b.removeMouseListener(handCursorListener);
  }
  
  protected Color getFocusColor() {
    return focusColor;
  }

  public void paint(Graphics g, JComponent c) {
    AbstractButton b = (AbstractButton)c;
    ButtonModel model = b.getModel();

    FontMetrics fm = g.getFontMetrics();

    Insets i = c.getInsets();

    viewRect.x = i.left;
    viewRect.y = i.top;
    viewRect.width = b.getWidth() - (i.right + viewRect.x);
    viewRect.height = b.getHeight() - (i.bottom + viewRect.y);

    textRect.x = textRect.y = textRect.width = textRect.height = 0;
    iconRect.x = iconRect.y = iconRect.width = iconRect.height = 0;

    Font f = c.getFont();
    g.setFont(f);

    // layout the text and icon
    String text =
      SwingUtilities.layoutCompoundLabel(
        c,
        fm,
        b.getText(),
        b.getIcon(),
        b.getVerticalAlignment(),
        b.getHorizontalAlignment(),
        b.getVerticalTextPosition(),
        b.getHorizontalTextPosition(),
        viewRect,
        iconRect,
        textRect,
        b.getText() == null ? 0 : b.getIconTextGap());

    clearTextShiftOffset();

    // perform UI specific press action, e.g. Windows L&F shifts text
    if (model.isArmed() && model.isPressed()) {
      paintButtonPressed(g, b);
    }

    // Paint the Icon
    if (b.getIcon() != null) {
      paintIcon(g, c, iconRect);
    }

    Composite oldComposite = ((Graphics2D)g).getComposite();

    if (model.isRollover()) {
      ((Graphics2D)g).setComposite(
        AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f));
    }

    if (text != null && !text.equals("")) {
      View v = (View)c.getClientProperty(BasicHTML.propertyKey);
      if (v != null) {
        textRect.x += getTextShiftOffset();
        textRect.y += getTextShiftOffset();
        v.paint(g, textRect);
        textRect.x -= getTextShiftOffset();
        textRect.y -= getTextShiftOffset();
      } else {
        paintText(g, b, textRect, text);
      }
    }

    if (b.isFocusPainted() && b.hasFocus()) {
      // paint UI specific focus
      paintFocus(g, b, viewRect, textRect, iconRect);
    }

    ((Graphics2D)g).setComposite(oldComposite);
  }

  protected void paintFocus(
    Graphics g,
    AbstractButton b,
    Rectangle viewRect,
    Rectangle textRect,
    Rectangle iconRect) {
    if (b.getParent() instanceof JToolBar) {
      // Windows doesn't draw the focus rect for buttons in a toolbar.
      return;
    }

    // focus painted same color as text
    int width = b.getWidth();
    int height = b.getHeight();
    g.setColor(getFocusColor());
    BasicGraphicsUtils.drawDashedRect(
      g,
      dashedRectGapX,
      dashedRectGapY,
      width - dashedRectGapWidth,
      height - dashedRectGapHeight);
  }

  protected void paintButtonPressed(Graphics g, AbstractButton b) {
    setTextShiftOffset();
  }

  static class HandCursor extends MouseAdapter {
    public void mouseEntered(MouseEvent e) {
      e.getComponent().setCursor(
        Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
    }
    public void mouseExited(MouseEvent e) {
      e.getComponent().setCursor(Cursor.getDefaultCursor());
    }
  }
}