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POBoxLayout misunderstanding strut
 

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    <p>I'm prgramming a simple input diagram in Swing. I use boxLayout to create a simple GUI of user input. Problem is that creating a horizontal strut between the JPanel of all the labels and the JPanel of the JTextFields causes the whole panel to shift downwards (weird) this is the whole panel:</p> <pre><code>private JPanel secondCard() { //main panel. set the boxlayout secondCard = new JPanel(); secondCard.setLayout(new BoxLayout(secondCard,BoxLayout.Y_AXIS)); // create vertical strut for looks secondCard.add(Box.createVerticalStrut(20)); // create title. center it. JLabel title = new JLabel("Configure main network parameters "); title.setAlignmentX(CENTER_ALIGNMENT); secondCard.add(title); // create vertical strut for looks secondCard.add(Box.createVerticalStrut(20)); // create panel for the description labels JPanel labelPanel = new JPanel(); labelPanel.setLayout(new BoxLayout(labelPanel,BoxLayout.Y_AXIS)); labelPanel.setAlignmentX(LEFT_ALIGNMENT); JLabel inPut =new JLabel("number of inputs"); inPut.setAlignmentX(LEFT_ALIGNMENT); labelPanel.add(inPut); inPut =new JLabel("number of outputs"); inPut.setAlignmentX(LEFT_ALIGNMENT); labelPanel.add(inPut); inPut =new JLabel("number of layers"); inPut.setAlignmentX(LEFT_ALIGNMENT); labelPanel.add(inPut); JPanel textFieldPanel = new JPanel(); textFieldPanel.setLayout(new BoxLayout(textFieldPanel,BoxLayout.Y_AXIS)); textFieldPanel.setAlignmentX(LEFT_ALIGNMENT); JTextField inputTextField = new JTextField(); inputTextField.setAlignmentX(LEFT_ALIGNMENT); textFieldPanel.add(inputTextField); inputTextField.setMinimumSize(new Dimension(0,0)); inputTextField = new JTextField(); inputTextField.setAlignmentX(LEFT_ALIGNMENT); textFieldPanel.add(inputTextField); inputTextField.setMinimumSize(new Dimension(0,0)); inputTextField = new JTextField(); inputTextField.setAlignmentX(LEFT_ALIGNMENT); textFieldPanel.add(inputTextField); inputTextField.setMinimumSize(new Dimension(0,0)); textFieldPanel.setMaximumSize(new Dimension(50, labelPanel.getMaximumSize().height)); JPanel inputPanel = new JPanel(); inputPanel.setLayout(new BoxLayout(inputPanel,BoxLayout.X_AXIS)); inputPanel.setAlignmentX(CENTER_ALIGNMENT); inputPanel.add(labelPanel); //this is the problem strut!! it causes inputPanel to shift downwards inputPanel.add(Box.createHorizontalStrut(20)); inputPanel.add(textFieldPanel); secondCard.add(inputPanel); return secondCard; } </code></pre> <p>without the strut it looks like: <img src="https://i.stack.imgur.com/fsuDE.jpg" alt="enter image description here"></p> <p>With strut it looks like (I know I suck at picture editing):</p> <p><img src="https://i.stack.imgur.com/DRyR5.jpg" alt="enter image description here"></p>
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