GUITasks.java

/*
    GNU LESSER GENERAL PUBLIC LICENSE
    Copyright (C) 2006 The Lobo Project

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Contact info: lobochief@users.sourceforge.net
 */
package org.lobobrowser.util.gui;

import java.awt.BasicStroke;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;

import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.KeyStroke;

public class GUITasks {
  public static Frame getTopFrame() {
    final Frame[] frames = Frame.getFrames();
    for (final Frame frame : frames) {
      if (frame.getFocusOwner() != null) {
        return frame;
      }
    }
    if (frames.length > 0) {
      return frames[0];
    }
    return null;
  }

  public static void drawDashed(final Graphics g, int x1, int y1, int x2, int y2, final int dashSize, final int gapSize) {
    if (x2 < x1) {
      final int temp = x1;
      x1 = x2;
      x2 = temp;
    }
    if (y2 < y1) {
      final int temp = y1;
      y1 = y2;
      y2 = temp;
    }
    final int totalDash = dashSize + gapSize;
    if (y1 == y2) {
      final int virtualStartX = (x1 / totalDash) * totalDash;
      for (int x = virtualStartX; x < x2; x += totalDash) {
        int topX = x + dashSize;
        if (topX > x2) {
          topX = x2;
        }
        int firstX = x;
        if (firstX < x1) {
          firstX = x1;
        }
        if (firstX < topX) {
          g.drawLine(firstX, y1, topX, y1);
        }
      }
    } else if (x1 == x2) {
      final int virtualStartY = (y1 / totalDash) * totalDash;
      for (int y = virtualStartY; y < y2; y += totalDash) {
        int topY = y + dashSize;
        if (topY > y2) {
          topY = y2;
        }
        int firstY = y;
        if (firstY < y1) {
          firstY = y1;
        }
        if (firstY < topY) {
          g.drawLine(x1, firstY, x1, topY);
        }
      }

    } else {
      // Not supported
      g.drawLine(x1, y1, x2, y2);
    }
  }

  public static void drawDotted(final Graphics g, final int x1, final int y1, final int x2, final int y2, final float width) {
    final Graphics ng = g.create();
    try {
      final Graphics2D g2d = (Graphics2D) ng.create();
      final float dot = Math.max(2f, width);

      final float[] dotPattern = { dot };
      final BasicStroke stroke = new BasicStroke(width, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 2.0f, dotPattern, 0.0f);
      g2d.setStroke(stroke);
      g2d.drawLine(x1, y1, x2, y2);
    } finally {
      ng.dispose();
    }
  }

  // As per this http://stackoverflow.com/a/661244/161257
  public static void addEscapeListener(final JDialog dialog) {
    final ActionListener escListener = e -> {
      dialog.setVisible(false);
      dialog.dispose();
    };

    dialog.getRootPane().registerKeyboardAction(escListener,
        KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0),
        JComponent.WHEN_IN_FOCUSED_WINDOW);

  }
}