Darcula/src/com/intellij/util/ui/JBInsets.java

/*
 * Copyright 2000-2016 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.util.ui;

import javax.swing.plaf.UIResource;
import java.awt.*;

import static com.intellij.util.ui.JBUI.scale;

/**
 * @author Konstantin Bulenkov
 */
public class JBInsets extends Insets {
    /**
     * Creates and initializes a new <code>Insets</code> object with the
     * specified top, left, bottom, and right insets.
     *
     * @param top    the inset from the top.
     * @param left   the inset from the left.
     * @param bottom the inset from the bottom.
     * @param right  the inset from the right.
     */
    public JBInsets(int top, int left, int bottom, int right) {
        super(scale(top), scale(left), scale(bottom), scale(right));
    }

    public int width() {
        return left + right;
    }

    public int height() {
        return top + bottom;
    }

    public static JBInsets create(Insets insets) {
        if (insets instanceof JBInsets) {
            JBInsets copy = new JBInsets(0, 0, 0, 0);
            copy.top = insets.top;
            copy.left = insets.left;
            copy.bottom = insets.bottom;
            copy.right = insets.right;
            return copy;
        }
        return new JBInsets(insets.top, insets.left, insets.bottom, insets.right);
    }

    public JBInsetsUIResource asUIResource() {
        return new JBInsetsUIResource(this);
    }

    public static class JBInsetsUIResource extends JBInsets implements UIResource {
        public JBInsetsUIResource(JBInsets insets) {
            super(0, 0, 0, 0);
            top = insets.top;
            left = insets.left;
            bottom = insets.bottom;
            right = insets.right;
        }
    }

    /**
     * @param dimension the size to increase
     * @param insets    the insets to add
     */
    public static void addTo(Dimension dimension, Insets insets) {
        if (insets != null) {
            dimension.width += insets.left + insets.right;
            dimension.height += insets.top + insets.bottom;
        }
    }

    /**
     * @param dimension the size to decrease
     * @param insets    the insets to remove
     */
    public static void removeFrom(Dimension dimension, Insets insets) {
        if (insets != null) {
            dimension.width -= insets.left + insets.right;
            dimension.height -= insets.top + insets.bottom;
        }
    }

    /**
     * @param rectangle the size to increase and the location to move
     * @param insets    the insets to add
     */
    public static void addTo(Rectangle rectangle, Insets insets) {
        if (insets != null) {
            rectangle.x -= insets.left;
            rectangle.y -= insets.top;
            rectangle.width += insets.left + insets.right;
            rectangle.height += insets.top + insets.bottom;
        }
    }

    /**
     * @param rectangle the size to decrease and the location to move
     * @param insets    the insets to remove
     */
    public static void removeFrom(Rectangle rectangle, Insets insets) {
        if (insets != null) {
            rectangle.x += insets.left;
            rectangle.y += insets.top;
            rectangle.width -= insets.left + insets.right;
            rectangle.height -= insets.top + insets.bottom;
        }
    }
}