SideBorder.java

/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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.intellij.ui;

import org.intellij.lang.annotations.MagicConstant;

import javax.swing.border.LineBorder;
import java.awt.*;

public class SideBorder extends LineBorder {
  public static final int NONE = 0;
  public static final int LEFT = 0x01;
  public static final int TOP = 0x02;
  public static final int RIGHT = 0x04;
  public static final int BOTTOM = 0x08;
  public static final int ALL = LEFT | TOP | RIGHT | BOTTOM;

  @MagicConstant(flags = {NONE, LEFT, TOP, RIGHT, BOTTOM, ALL})
  public @interface SideMask {}

  private final int mySideMask;

  public SideBorder(Color color, @SideMask int mask) {
    this(color, mask, 1);
  }

  public SideBorder(Color color, @SideMask int mask, int thickness) {
    super(color, thickness);
    mySideMask = mask;
  }

  @Override
  public Insets getBorderInsets(Component component) {
    return new Insets(
      (mySideMask & TOP) != 0 ? getThickness() : 0,
      (mySideMask & LEFT) != 0 ? getThickness() : 0,
      (mySideMask & BOTTOM) != 0 ? getThickness() : 0,
      (mySideMask & RIGHT) != 0 ? getThickness() : 0
    );
  }

  @Override
  public Insets getBorderInsets(Component component, Insets insets) {
    insets.top = (mySideMask & TOP) != 0 ? getThickness() : 0;
    insets.left = (mySideMask & LEFT) != 0 ? getThickness() : 0;
    insets.bottom = (mySideMask & BOTTOM) != 0 ? getThickness() : 0;
    insets.right = (mySideMask & RIGHT) != 0 ? getThickness() : 0;
    return insets;
  }

  @Override
  public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
    Color oldColor = g.getColor();
    g.setColor(getLineColor());
    if ((mySideMask & LEFT) != 0) g.fillRect(x, y, thickness, height);
    if ((mySideMask & TOP) != 0) g.fillRect(x, y, width, thickness);
    if ((mySideMask & RIGHT) != 0) g.fillRect(x + width - thickness, y, thickness, height);
    if ((mySideMask & BOTTOM) != 0) g.fillRect(x, y + height - thickness, width, thickness);
    g.setColor(oldColor);
  }
}