test/jdk/java/awt/ScrollPane/ScrollPaneSize.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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/*
 * @test
 * @bug 4117404
 * @summary Tests that child component is always at least large as scrollpane
 * @library /java/awt/regtesthelpers
 * @build PassFailJFrame
 * @run main/manual ScrollPaneSize
 */

import java.awt.Button;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.Panel;
import java.awt.ScrollPane;
import java.util.List;

public class ScrollPaneSize {
    public static void main(String[] args) throws Exception {
        String INSTRUCTIONS = """
                1. Three frames representing the three different ScrollPane scrollbar
                   policies will appear.
                2. Verify that when you resize the windows, the child component in the
                   scrollpane always expands to fill the scrollpane. The scrollpane
                   background is colored red to show any improper bleed through.
                   """;
        PassFailJFrame.builder()
                .title("Test Instructions")
                .instructions(INSTRUCTIONS)
                .columns(40)
                .testUI(ScrollPaneSize::initialize)
                .positionTestUIRightColumn()
                .build()
                .awaitAndCheck();
    }

    static List<Frame> initialize() {
        return List.of(new ScrollFrame("SCROLLBARS_AS_NEEDED", ScrollPane.SCROLLBARS_AS_NEEDED),
                new ScrollFrame("SCROLLBARS_ALWAYS", ScrollPane.SCROLLBARS_ALWAYS),
                new ScrollFrame("SCROLLBARS_NEVER", ScrollPane.SCROLLBARS_NEVER));
    }
}

class ScrollFrame extends Frame {
    ScrollFrame(String title, int policy) {
        super(title);
        setLayout(new GridLayout(1, 1));
        ScrollPane c = new ScrollPane(policy);
        c.setBackground(Color.red);
        Panel panel = new TestPanel();
        c.add(panel);
        add(c);
        pack();
        Dimension size = panel.getPreferredSize();
        Insets insets = getInsets();
        setSize(size.width + 45 + insets.right + insets.left,
                size.height + 20 + insets.top + insets.bottom);
    }
}

class TestPanel extends Panel {
    TestPanel() {
        setLayout(new FlowLayout());
        setBackground(Color.white);

        Button b1, b2, b3;
        add(b1 = new Button("Button1"));
        add(b2 = new Button("Button2"));
        add(b3 = new Button("Button3"));
    }
}