java 如何设置摆动组件的大小

How to set size of swing components

提问by Victor Mukherjee

I want to customize the height and width of the JTextField objects. I have tried with the setSize method, passing width and height as dimensions and as int as well. But none of them seems to work. Am I missing something, like some mandatory method call on the panel or something so that the size customization would be effective? Please help. Thanks in advance.

我想自定义 JTextField 对象的高度和宽度。我尝试过 setSize 方法，将宽度和高度作为尺寸和整数传递。但它们似乎都不起作用。我是否缺少某些东西，例如面板上的某些强制性方法调用或某些东西，以便尺寸自定义有效？请帮忙。提前致谢。

EDIT: Here is a bit of the code:

编辑：这是一些代码：

public class WestPanel extends JPanel{
private JLabel dateL;
private JTextField date;
public WestPanel(){
setBackground(Color.white);
setLayout(new GridLayout(1,2,0,0));
dateL=new JLabel("Date: ");
date=new JTextField("dd/mm/yyyy");
date.setSize(60,10);
add(dateL);
add(date);
//....remaining code....//

回答by mre

Let the layout manager take care of the dimensions of your Swing components, but if you absolutely must, use setPreferredSizein combination with a layout manager that respects that property.

让布局管理器处理您的 Swing 组件的尺寸，但如果绝对必须，请setPreferredSize与尊重该属性的布局管理器结合使用。

回答by Dan D.

The setSize()method only works when setting the layout manager to null.

该setSize()方法仅在将布局管理器设置为 null 时有效。

回答by Gilbert Le Blanc

I'm not sure this answers the original poster's questions, but hopefully it will be helpful to other Swing developers.

我不确定这是否回答了原始海报的问题，但希望它对其他 Swing 开发人员有所帮助。

Most people want the labels and components to line up, like in the following dialog I created.

大多数人希望标签和组件对齐，就像我创建的以下对话框一样。

I use the Swing layout manager GridBagLayout to create this type of layout. Rather than lots of explanation, here's the code that created this dialog.

我使用 Swing 布局管理器 GridBagLayout 创建这种类型的布局。而不是大量的解释，这里是创建这个对话框的代码。

package com.ggl.business.planner.view;

import java.awt.Component;
import java.awt.Container;
import java.awt.Dialog;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSpinner;
import javax.swing.SpinnerNumberModel;
import javax.swing.SwingConstants;

import com.ggl.business.planner.model.BusinessPlannerModel;
import com.ggl.business.planner.view.extended.EscapeDialog;
import com.ggl.business.planner.view.extended.JFontChooser;

public class OptionsDialog {

    protected static final Insets entryInsets = new Insets(0, 10, 4, 10);
    protected static final Insets spaceInsets = new Insets(10, 10, 4, 10);
    protected static final Insets noInsets    = new Insets(0, 0, 0, 0);
    protected static final Insets iconInsets  = new Insets(0, 4, 0, 0);

    protected BusinessPlannerFrame frame;

    protected BusinessPlannerModel model;

    protected EscapeDialog dialog;

    protected JButton activityTextFontButton;
    protected JButton connectorTextFontButton;

    protected JSpinner borderSizeSpinner;

    protected SpinnerNumberModel spinnerNumberModel;

    protected boolean okPressed;

    public OptionsDialog(BusinessPlannerModel model, BusinessPlannerFrame frame) {
        this.model = model;
        this.frame = frame;
        createPartControl();
    }

    protected void createPartControl() {
        dialog = new EscapeDialog();
        dialog.setTitle("Business Planner Options");
        dialog.setLayout(new GridBagLayout());

        int gridy = 0;
        gridy = createBorderFields(gridy);
        gridy = createFontFields(gridy);
        gridy = createButtonFields(gridy);

        dialog.pack();
        dialog.setBounds(dialogBounds());
        dialog.setModalityType(Dialog.ModalityType.APPLICATION_MODAL);
        dialog.setVisible(true);
    }

    protected int createBorderFields(int gridy) {
        JLabel borderSizeLabel = new JLabel("Border size:");
        borderSizeLabel.setHorizontalAlignment(SwingConstants.LEFT);
        addComponent(dialog, borderSizeLabel, 0, gridy, 1, 1, spaceInsets,
                GridBagConstraints.LINE_START, GridBagConstraints.HORIZONTAL);

        spinnerNumberModel = new SpinnerNumberModel(model.getActivityBorder(), 1, 5, 1);
        borderSizeSpinner = new JSpinner(spinnerNumberModel);
        addComponent(dialog, borderSizeSpinner, 1, gridy++, 4, 1, spaceInsets,
                GridBagConstraints.LINE_START, GridBagConstraints.HORIZONTAL);

        return gridy;
    }

    protected int createFontFields(int gridy) {
        JLabel boxtextFontLabel = new JLabel("Activity text font:");
        boxtextFontLabel.setHorizontalAlignment(SwingConstants.LEFT);
        addComponent(dialog, boxtextFontLabel, 0, gridy, 1, 1, spaceInsets,
                GridBagConstraints.LINE_START, GridBagConstraints.HORIZONTAL);

        Font font = model.getActivityFont();
        activityTextFontButton = new JButton(getFontText(font));
        activityTextFontButton.setFont(font);
        activityTextFontButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent event) {
                JFontChooser fontChooser = new JFontChooser();
                fontChooser.setSelectedFont(model.getActivityFont());
                int result = fontChooser.showDialog(dialog);
                if (result == JFontChooser.OK_OPTION) {
                    Font font = fontChooser.getSelectedFont();
                    String text = getFontText(font);
                    model.setActivityFont(font);
                    activityTextFontButton.setText(text);
                    activityTextFontButton.setFont(font);
                    JButton dummy = new JButton(text);
                    setButtonSizes(activityTextFontButton, 
                            connectorTextFontButton, dummy);
                    dialog.validate();
                    dialog.pack();
                }
            }
        });
        addComponent(dialog, activityTextFontButton, 1, gridy++, 4, 1, spaceInsets,
                GridBagConstraints.LINE_START, GridBagConstraints.HORIZONTAL);

        JLabel connectortextFontLabel = new JLabel("Connector text font:");
        connectortextFontLabel.setHorizontalAlignment(SwingConstants.LEFT);
        addComponent(dialog, connectortextFontLabel, 0, gridy, 1, 1, spaceInsets,
                GridBagConstraints.LINE_START, GridBagConstraints.HORIZONTAL);

        font = model.getConnectorFont();
        connectorTextFontButton = new JButton(getFontText(font));
        connectorTextFontButton.setFont(font);
        connectorTextFontButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent event) {
                JFontChooser fontChooser = new JFontChooser();
                fontChooser.setSelectedFont(model.getConnectorFont());
                int result = fontChooser.showDialog(dialog);
                if (result == JFontChooser.OK_OPTION) {
                    Font font = fontChooser.getSelectedFont();
                    String text = getFontText(font);
                    model.setConnectorFont(font);
                    connectorTextFontButton.setText(text);
                    connectorTextFontButton.setFont(font);
                    JButton dummy = new JButton(text);
                    setButtonSizes(activityTextFontButton, 
                            connectorTextFontButton, dummy);
                    dialog.validate();
                    dialog.pack();
                }
            }
        });
        addComponent(dialog, connectorTextFontButton, 1, gridy++, 4, 1, spaceInsets,
                GridBagConstraints.LINE_START, GridBagConstraints.HORIZONTAL);

        setButtonSizes(activityTextFontButton, connectorTextFontButton);

        return gridy;
    }

    protected String getFontText(Font font) {
        StringBuilder builder = new StringBuilder();

        builder.append(font.getName());
        builder.append(", ");
        builder.append(font.getSize());
        builder.append(" points, ");

        if (font.isPlain()) {
            builder.append("plain");
        } else if (font.isBold()) {
            builder.append("bold ");
        } else if (font.isItalic()) {
            builder.append("italic");
        } 

        return builder.toString();
    }

    protected int createButtonFields(int gridy) {
        JPanel buttondrawingPanel = new JPanel();
        buttondrawingPanel.setLayout(new FlowLayout());

        JButton okButton = new JButton("OK");
        okButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent event) {
                //TODO Add edits to make sure fields are filled correctly
                setModel();
                okPressed = true;
                dialog.setVisible(false);
            }       
        });
        dialog.setOkButton(okButton);
        buttondrawingPanel.add(okButton);

        JButton cancelButton = new JButton("Cancel");
        cancelButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent event) {
                okPressed = false;
                dialog.setVisible(false);
            }
        });
        buttondrawingPanel.add(cancelButton);

        setButtonSizes(okButton, cancelButton);

        addComponent(dialog, buttondrawingPanel, 0, gridy++, 5, 1, spaceInsets,
                GridBagConstraints.LINE_START, GridBagConstraints.HORIZONTAL);

        return gridy;
    }

    protected void addComponent(Container container, Component component,
            int gridx, int gridy, int gridwidth, int gridheight, 
            Insets insets, int anchor, int fill) {
        GridBagConstraints gbc = new GridBagConstraints(gridx, gridy,
                gridwidth, gridheight, 1.0D, 1.0D, anchor, fill, insets, 0, 0);
        container.add(component, gbc);
    }

    protected void setButtonSizes(JButton ... buttons) {
        Dimension preferredSize = new Dimension();
        for (JButton button : buttons) {
            Dimension d = button.getPreferredSize();
            preferredSize = setLarger(preferredSize, d);
        }
        for (JButton button : buttons) {
            button.setPreferredSize(preferredSize);
        }
    }

    protected Dimension setLarger(Dimension a, Dimension b) {
        Dimension d = new Dimension();
        d.height = Math.max(a.height, b.height);
        d.width = Math.max(a.width, b.width);
        return d;
    }

    protected void setModel() {
        model.setActivityBorder(spinnerNumberModel.getNumber().intValue()); 
    }

    protected Rectangle dialogBounds() {
        int margin = 200;
        Rectangle bounds = dialog.getBounds();
        Rectangle f = frame.getFrame().getBounds();

        bounds.x = f.x + margin;
        bounds.y = f.y + margin;

        return bounds;
    }

    public boolean isOkPressed() {
        return okPressed;
    }

}

The EscapeDialog class I extend just lets me use the Esc key to close the dialog, as if I left clicked on the Cancel button.

我扩展的 EscapeDialog 类只是让我使用 Esc 键关闭对话框，就像我左键单击取消按钮一样。

There are two things I'll make note of. The first is the addComponent method, which simplifies adding components to a GridBagLayout.

有两件事我要注意。第一个是 addComponent 方法，它简化了向 GridBagLayout 添加组件的过程。

The second is the setButtonSizes method, which makes all of the button sizes uniform. Even though they are JButton components, and not JTextField components, you can do something similar if you want to make JTextField components the same size.

第二个是 setButtonSizes 方法，它使所有按钮大小统一。即使它们是 JButton 组件，而不是 JTextField 组件，如果您想让 JTextField 组件具有相同的大小，您也可以执行类似的操作。

回答by Andrew Thompson

As suggested in comments, use size hints in the text field constructor, and an appropriate layout manager.

正如评论中所建议的，在文本字段构造函数和适当的布局管理器中使用大小提示。

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

public class WestPanel extends JPanel {

    private JLabel dateL;
    private JTextField date;

    public WestPanel(){
        setBackground(Color.white);
        setLayout(new FlowLayout());
        dateL=new JLabel("Date: ");
        date=new JTextField("dd/mm/yyyy",6);
        add(dateL);
        add(date);
    }

    public static void main(String[] args) {
        Runnable r = new Runnable() {
            @Override
            public void run() {
                JPanel gui = new JPanel(new BorderLayout());
                gui.add(new WestPanel(), BorderLayout.LINE_START);
                gui.setBackground(Color.ORANGE);
                JOptionPane.showMessageDialog(null, gui);
            }
        };
        SwingUtilities.invokeLater(r);
    }
}

回答by Resh32

Size of your components in Swing will depend on the type of layout manager you are using. If you want full control of UI, you can use a Freeflow layout.

Swing 中组件的大小取决于您使用的布局管理器的类型。如果您想完全控制 UI，可以使用 Freeflow 布局。

Read the full story here: http://docs.oracle.com/javase/tutorial/uiswing/layout/using.html

在此处阅读全文：http: //docs.oracle.com/javase/tutorial/uiswing/layout/using.html

回答by Ewen

JTextField can not be set size, infact, you should use a JTextArea instead.

JTextField 不能设置大小，事实上，您应该使用 JTextArea 代替。