android/src/com/android/tools/idea/ui/ImageComponent.java

/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * 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.android.tools.idea.ui;

import com.intellij.ui.components.panels.OpaquePanel;
import com.intellij.util.ui.UIUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;

/**
 * ImageComponent is a Swing component that displays an image. The image is scaled to fit inside the component bounds, which are set
 * externally.
 */
public class ImageComponent extends OpaquePanel {
  protected Icon myIcon = null;

  public ImageComponent() {
  }

  public ImageComponent(@Nullable Icon icon) {
    myIcon = icon;
  }

  @Override
  protected void paintChildren(@NotNull Graphics g) {
    if (myIcon == null) return;

    final BufferedImage image = UIUtil.createImage(myIcon.getIconWidth(), myIcon.getIconHeight(), BufferedImage.TYPE_INT_ARGB);
    final Graphics2D gg = image.createGraphics();
    myIcon.paintIcon(this, gg, 0, 0);
    g.drawImage(image, 0, 0, getWidth(), getHeight(), 0, 0, image.getWidth(), image.getHeight(), this);
  }

  public void setIcon(@Nullable Icon icon) {
    myIcon = icon;
    revalidate();
    repaint();
  }
}