platform/platform-api/src/com/intellij/util/ui/FadeInFadeOut.java

/*
 * 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 org.jetbrains.annotations.Nullable;

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

/**
 * It supposed to cover whole area of JLayeredPane and process "FadeIn&Out" effects with its inner components
 */

public class FadeInFadeOut extends JComponent {
  public static final Integer LAYER = new Integer(JLayeredPane.POPUP_LAYER + 1);
  public static final int TOTAL_FRAMES = 10;

  @NotNull
  private final Component myComponent;
  private final BufferedImage myComponentImage;
  private Rectangle myComponentBounds;

  @Nullable
  private final Component myIcon;
  private Rectangle myIconBounds;

  private final boolean myFadeIn;

  private boolean myTriggered = false;
  private double myRatio = 0;
  private final Animator myAnimator;
  private Runnable myOnDone = null;


  public FadeInFadeOut(@NotNull Component component, int timeToComplete, boolean fadeIn, @Nullable Component icon) {
    setFocusable(false);
    myComponent = component;
    myFadeIn = fadeIn;
    myRatio = myFadeIn ? 0 : 1;
    myIcon = icon;

    myComponentImage = UIUtil.createImage(myComponent.getWidth(), myComponent.getHeight(), BufferedImage.TYPE_INT_ARGB);
    Graphics2D graphics = myComponentImage.createGraphics();
    myComponent.paint(graphics);
    graphics.dispose();
    myAnimator = new Animator("FadeInFadeOut", TOTAL_FRAMES, timeToComplete, false) {
      @Override
      public void paintNow(int frame, int totalFrames, int cycle) {
        double linearProgress = Math.max(0, Math.min(1, (double)frame / totalFrames));
        if (!myFadeIn) linearProgress = 1 - linearProgress;
        myRatio = (1 - Math.cos(Math.PI * linearProgress)) / 2;
        paintImmediately(0, 0, getWidth(), getHeight());
      }

      @Override
      protected void paintCycleEnd() {
        super.paintCycleEnd();
        if (myOnDone != null) {
          myOnDone.run();
        }
      }
    };
  }

  @Override
  public void reshape(int x, int y, int w, int h) {
    super.reshape(x, y, w, h);
    if (!myTriggered) {
      myComponentBounds = SwingUtilities.convertRectangle(myComponent.getParent(), myComponent.getBounds(), this);
      if (myIcon == null) {
        myIconBounds = myComponentBounds;
      } else {
        myIconBounds = SwingUtilities.convertRectangle(myIcon.getParent(), myIcon.getBounds(), this);
      }
    }
  }

  public void doAnimation(final Runnable onDone) {
    myOnDone = onDone;
    if (myTriggered || !isShowing()) return;

    myTriggered = true;
    myAnimator.resume();
  }

  public final void paint(final Graphics g_) {
    int x = (int)(myIconBounds.x * (1 - myRatio) + myComponentBounds.x * myRatio);
    int y = (int)(myIconBounds.y * (1 - myRatio) + myComponentBounds.y * myRatio);
    int width = (int)(myIconBounds.width * (1 - myRatio) + myComponentBounds.width * myRatio);
    int height = (int)(myIconBounds.height * (1 - myRatio) + myComponentBounds.height * myRatio);
    Graphics2D g = (Graphics2D)g_.create();
    try {
      g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, .5F + (float)(myRatio / 2)));
      g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
      g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
      g.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
      g.drawImage(myComponentImage, x, y, width, height, this);
    }
    finally {
      g.dispose();
    }
  }
}