platform/platform-api/src/com/intellij/ui/ExpandedItemRendererComponentWrapper.java

/*
 * Copyright 2000-2012 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 com.intellij.util.ui.AbstractLayoutManager;
import org.jetbrains.annotations.NotNull;

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

public class ExpandedItemRendererComponentWrapper extends JComponent {
  public ExpandedItemRendererComponentWrapper(@NotNull final Component rendererComponent) {
    add(rendererComponent);
    setOpaque(false);
    setLayout(new AbstractLayoutManager() {
      @Override
      public Dimension preferredLayoutSize(Container parent) {
        return rendererComponent.getPreferredSize();
      }

      @Override
      public void layoutContainer(Container parent) {
        Dimension size = parent.getSize();
        Insets i = parent.getInsets();
        Dimension pref = rendererComponent.getPreferredSize();
        rendererComponent.setBounds(i.left, i.top, Math.max(pref.width, size.width - i.left - i.right), size.height - i.top - i.bottom);
      }
    });
  }

  @Override
  public void setBorder(Border border) {
    if (getComponentCount() == 1) {
      Component component = getComponent(0);
      if (component instanceof JComponent) {
        ((JComponent)component).setBorder(border);
        return;
      }
    }
    super.setBorder(border);
  }
}