| /* |
| * Copyright 2000-2013 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 org.jetbrains.annotations.NotNull; |
| |
| import javax.swing.*; |
| import java.awt.*; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * @author max |
| * @author Konstantin Bulenkov |
| * |
| * @see com.intellij.util.ui.ColorIcon |
| */ |
| public class EmptyIcon implements Icon { |
| private static final Map<Integer, Icon> cache = new HashMap<Integer, Icon>(); |
| |
| public static final Icon ICON_16 = create(16); |
| public static final Icon ICON_18 = create(18); |
| public static final Icon ICON_8 = create(8); |
| public static final Icon ICON_0 = create(0); |
| |
| private final int width; |
| private final int height; |
| |
| public static Icon create(int size) { |
| Icon icon = cache.get(size); |
| if (icon == null && size < 129) { |
| cache.put(size, icon = new EmptyIcon(size, size)); |
| } |
| return icon == null ? new EmptyIcon(size, size) : icon; |
| } |
| |
| public static Icon create(int width, int height) { |
| return width == height ? create(width) : new EmptyIcon(width, height); |
| } |
| |
| public static Icon create(@NotNull Icon base) { |
| return create(base.getIconWidth(), base.getIconHeight()); |
| } |
| |
| /** |
| * @deprecated use {@linkplain #create(int)} for caching. |
| */ |
| public EmptyIcon(int size) { |
| this(size, size); |
| } |
| |
| public EmptyIcon(int width, int height) { |
| this.width = width; |
| this.height = height; |
| } |
| |
| /** |
| * @deprecated use {@linkplain #create(javax.swing.Icon)} for caching. |
| */ |
| public EmptyIcon(@NotNull Icon base) { |
| this(base.getIconWidth(), base.getIconHeight()); |
| } |
| |
| @Override |
| public int getIconWidth() { |
| return width; |
| } |
| |
| @Override |
| public int getIconHeight() { |
| return height; |
| } |
| |
| @Override |
| public void paintIcon(Component component, Graphics g, int i, int j) { |
| } |
| |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (!(o instanceof EmptyIcon)) return false; |
| |
| final EmptyIcon icon = (EmptyIcon)o; |
| |
| if (height != icon.height) return false; |
| if (width != icon.width) return false; |
| |
| return true; |
| } |
| |
| public int hashCode() { |
| int sum = width + height; |
| return sum * (sum + 1)/2 + width; |
| } |
| } |