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POJScrollPanel don't show the scroll
 

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    <p>I have a JFrame with dimension <em>500</em> X <em>500</em>: it contains a JComponent with size <em>1000</em> X <em>1000</em> and this JComponent is contained into a JScrollBar with <em>scrollbar always present</em>. The screenshot <img src="https://i.stack.imgur.com/QTLf2.png" alt="enter image description here"></p> <p>The code </p> <pre><code> /**component */ public class LinesComponent extends JPanel .... /***other class: CommandPanel contains the LinesComponents*/ public class CommandPanel extends JPanel{ .... private LinesComponent panel; /*JScrollPanel*/ private void buildScrollPanel(Container container) { JScrollPane scroll = new JScrollPane(panel); scroll.setSize(1000,1000); scroll.setBorder(new LineBorder(Color.BLACK)); scroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS); scroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); container.add(scroll); } /**JFrame*/ private void buildFrame(String title) { this.testFrame = new JFrame(title); this.testFrame.setLayout(new FlowLayout()); this.testFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.testFrame.setLocationRelativeTo(null); this.testFrame.setSize(500,500); this.testFrame.setBackground(EnumColor.BACKGROUND_PANEL.getValue()); } //end CommandPanel </code></pre> <p>As showed into screenshot, the window has the scrollbar but it isn't working.</p> <p>I tried to change the dimensions of <em>JPanel</em> and <em>JFrame</em> but the situation doesn't change.</p> <p>I know that the scroll appears when the dimension of <em>JComponent</em> are greater of dimensione of <em>JPanel</em> container, but in this moment I see that I lose some information but I don't understand what is.</p> <p>Do you have any suggest, please?</p> <p>PS into screenshot I show that the scroll doesn't work, but in my <em>desiderata</em> the scroll has to work in vertical and horizontal senses</p> <p>PS PS all my code in only one class</p> <pre><code>package testDebug; import java.awt.Color; import java.awt.Container; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.Graphics; import java.awt.GridLayout; import java.awt.LayoutManager; import java.awt.event.ActionListener; import java.util.ArrayList; import java.util.Iterator; import java.util.LinkedList; import java.util.List; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextField; import javax.swing.ScrollPaneConstants; import javax.swing.border.LineBorder; public class AllClasses { public static void main(String[] a){ CommandPanel commandPanel=new CommandPanel("test", new ArrayList&lt;MyPoint&gt;()); } } class LinesComponent extends JPanel{ private static final long serialVersionUID = 1L; private final LinkedList&lt;Line&gt; lines = new LinkedList&lt;Line&gt;(); private static class Line { final int x1;//x del primo punto final int y1;//y del primo punto final int x2;//x del secondo punto final int y2;//y del secondo punto final Color color; final int pressure; public Line(int x1, int y1, int x2, int y2, Color color) { this.x1 = x1; this.y1 = y1; this.x2 = x2; this.y2 = y2; this.color = color; this.pressure=3; } public Line(int x1, int y1, int x2, int y2, int newPressure, Color color) { this.x1 = x1; this.y1 = y1; this.x2 = x2; this.y2 = y2; this.pressure=newPressure; this.color = color; } }//Line public LinesComponent(){ setBorder(new LineBorder(Color.BLACK)); setBackground(Color.WHITE); setPreferredSize(new Dimension(400, 400)); } public void clearLines() { this.lines.clear(); repaint(); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); for (Line line : this.lines) { g.setColor(line.color); g.fillOval(line.x1,line.y1, line.pressure, line.pressure); } } public void addPoint(MyPoint p, Color randomColor) { //call addLine(double x, double y, double xtilt, double ytilt, Color randomColor); } private void addLine(double x, double y, double xtilt, double ytilt, Color randomColor) { this.lines.add(new Line((int) x, (int) y, (int) xtilt, (int) ytilt, randomColor)); repaint(); } } enum EnumButton { DECREASE_X("-"), INCREASE_X("+"), DECREASE_Y("-"), INCREASE_Y("+"), DECREASE_ZOOM("-"), INCREASE_ZOOM("+"); private JButton button; public JButton button(){ return this.button; } private EnumButton(String s){ this.button=new JButton(s); } public void addActionListener(ActionListener a){ this.button().addActionListener(a); } } class CommandPanel extends JPanel { private static final long serialVersionUID = 1L; private static final String INITIAL_POSITION="0"; private JFrame testFrame = null; private LinesComponent panelSignature; private JTextField positionX=new JTextField(5); private JTextField positionY=new JTextField(5); public CommandPanel(String title, List&lt;MyPoint&gt; newPoints) { super(); positionX.setText(INITIAL_POSITION); positionY.setText(INITIAL_POSITION); buildFrame(title); Container container = testFrame.getContentPane(); this.panelSignature=initPanel(); buildScrollPanel(container); paintLine(newPoints); allignButtons(); defineFrame(); } private void buildScrollPanel(Container container) { JScrollPane scroll = new JScrollPane(panelSignature); scroll.setSize(300,300); scroll.setBorder(new LineBorder(Color.BLACK)); scroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS); scroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); container.add(scroll); } private void defineFrame() { this.testFrame.pack(); this.testFrame.setVisible(true); } private void paintLine(List&lt;MyPoint&gt; points) { Iterator&lt;MyPoint&gt; iterator = points.iterator(); while (iterator.hasNext()) { MyPoint point = iterator.next(); this.panelSignature.addPoint(point,Color.BLUE); } }//disegnaLinea private void allignButtons() { JPanel buttonPanel = new JPanel(new FlowLayout()); sectionHorizontalMovement(buttonPanel); sectionVerticalMovement(buttonPanel); sectionZoom(buttonPanel); this.testFrame.add(buttonPanel); } private void sectionZoom(JPanel buttonPanel) { buttonPanel.add(EnumLabel.ZOOM.label()); buttonPanel.add(EnumButton.INCREASE_ZOOM.button()); buttonPanel.add(EnumButton.DECREASE_ZOOM.button()); buttonPanel.add(EnumLabel.ZOOM_DIRECTION.label()); buttonPanel.add(EnumLabel.EMPTY.label()); }//sezioneZoom private void sectionVerticalMovement(JPanel pannelloPulsanti) { pannelloPulsanti.add(EnumLabel.MOVE_UP_DOWN.label()); pannelloPulsanti.add(EnumButton.INCREASE_Y.button()); pannelloPulsanti.add(EnumButton.DECREASE_Y.button()); pannelloPulsanti.add(EnumLabel.Y_DIRECTION.label()); pannelloPulsanti.add(EnumLabel.MAX_Y_ALLOWED.label()); }//sezioneSpostamentoVerticale private void sectionHorizontalMovement(JPanel pannelloPulsanti) { pannelloPulsanti.add(EnumLabel.MOVE_RIGHT_LEFT.label()); pannelloPulsanti.add(EnumButton.INCREASE_X.button()); pannelloPulsanti.add(EnumButton.DECREASE_X.button()); pannelloPulsanti.add(EnumLabel.X_DIRECTION.label()); pannelloPulsanti.add(EnumLabel.MAX_X_ALLOWED.label()); }//sezioneSpostamentoOrizzontale public LinesComponent initPanel() { LinesComponent linesComponent= new LinesComponent(); linesComponent.setBorder(new LineBorder(Color.GRAY)); return linesComponent; } private void buildFrame(String titolo) { this.testFrame = new JFrame(titolo); this.testFrame.setLayout(new FlowLayout()); this.testFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.testFrame.setLocationRelativeTo(null); this.testFrame.setSize(700,700); this.testFrame.setBackground(Color.WHITE); } } enum EnumLayout { FRAME(new FlowLayout()), BUTTON_PANEL(new GridLayout(3, 5)); private LayoutManager value; private EnumLayout(LayoutManager manager){ this.value=manager; } public LayoutManager layout() { return value; } } enum EnumLabel { MOVE_RIGHT_LEFT("Sposta in orizzontale"), MOVE_UP_DOWN("Sposta in verticale"), ZOOM("Zoom"), EMPTY(""), MAX_X_ALLOWED("LARGHEZZA: 600"), MAX_Y_ALLOWED("ALTEZZA: 600"), X_DIRECTION("0"), Y_DIRECTION("0"), ZOOM_DIRECTION("1") ; private JLabel label; private EnumLabel(String lab){ this.label=new JLabel(lab); } public JLabel label (){ return this.label; } } class MyPoint { // class with the data: useless for position of panel } </code></pre>
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    1. COYour code is incomplete for us to answer this question. Try to post an [SSCCE](http://sscce.org). What is `container`? What is the content of `LinesComponent`? Layout, size, locations etc... all relies on one another. Btw, calling setSize()/setLocation()/setBounds() is useless if you use LayoutManager's (which you should!)
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    2. COSorry, I tried to insert the most useful code for not tiring you. The interested code take some class: where can I to insert all my code (related this problem) for allow you to see him?
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    3. COThe size of the viewable area is defined by the preferred size of the view (within the scroll pane). We need see `LinesComponents` to know what's going on...
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      1. USMadProgrammer
 

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