[英]Adding JPanel from another class to JPanel in JFrame
我無法從主類中獲取我的JFrame來顯示另一個類的JPanel。 一切都編譯沒有錯誤。
JFrameTest.java:
package jframetest;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class JFrameTest extends JFrame {
public JFrameTest() {
FlowLayout mainLayout = new FlowLayout();
setSize(320, 480);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(mainLayout);
JPanel panelMain = new JPanel(mainLayout);
JButton testButton = new JButton("Test12");
panelMain.add(testButton);
JPanelOne panel = new JPanelOne();
panelMain.add(panel);
panel.setVisible(true);
add(panelMain);
}
public static void main(String[] arguments) {
JFrameTest frame = new JFrameTest();
frame.setVisible(true);
}
}
JPanelOne.java:
package jframetest;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JPanel;
public class JPanelOne extends JPanel {
public JPanelOne() {
FlowLayout layoutPanel = new FlowLayout();
JPanel panel = new JPanel(layoutPanel);
JButton button = new JButton("test");
panel.add(button);
panel.setVisible(true);
}
}
將不同的JPanel保留在自己的類中是一種好習慣嗎? (示例:希望JFrame包含幾個相同大小的JPanel,將通過將setVisible()設置為true / false來切換)
編輯
謝謝你的所有答案。 指出。 現在回到我的問題:
現在我知道如何添加在其他類中創建的單個GUI元素,我想知道是否可以在其中一個類中組織具有布局管理器的元素(可能在除JPanel之外的其他容器中),因此我可以將它們添加為組織布局(這就是為什么我要求在其他類中創建整個JPanel)。 如圖所示:
這個例子的JPanel(第二類)代碼是:
package jframetest;
import java.awt.*;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSeparator;
import net.miginfocom.swing.MigLayout;
public class JPanelOne extends JPanel {
private JPanel panelSettingsMain;
private JLabel labelChooseLanguage, labelWordsCollection;
private JButton buttonSelectLanguage, buttonSelectCollection,
buttonStatistics, buttonPrintingOptions, buttonAddNewWordCollection,
buttonInterfaceCustomization;
private JSeparator separatorSettingsOne, separatorSettingsTwo,
separatorSettingsThree, separatorSettingsFour,
separatorSettingsFive;
private Color greenRegular, separatorGreenLight, separatorGreenDark;
public JPanelOne() {
// creating settings main panel
// setting up layout managers
MigLayout layoutSettingsMain = new MigLayout(
"insets 3 0 0 0");
// setting up colors
greenRegular = new Color(30, 165, 145);
separatorGreenLight = new Color(190, 240, 220);
separatorGreenDark = new Color(130, 205, 180);
panelSettingsMain = new JPanel(layoutSettingsMain);
panelSettingsMain.setBackground(Color.WHITE);
// setting up choose language label
labelChooseLanguage = new JLabel("Choose language:");
panelSettingsMain.add(labelChooseLanguage,
"gapleft 10, gaptop 15, width 200");
// setting up select language button
buttonSelectLanguage = new JButton("language");
buttonSelectLanguage.setForeground(greenRegular);
buttonSelectLanguage.setFocusPainted(false);
buttonSelectLanguage.setBorder(null);
buttonSelectLanguage.setContentAreaFilled(false);
buttonSelectLanguage.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonSelectLanguage, "gapbottom 15px, wrap");
// setting up light separator
separatorSettingsOne = new JSeparator();
separatorSettingsOne.setForeground(separatorGreenLight);
panelSettingsMain.add(separatorSettingsOne,
"span 2, width 320, gapbottom 15, wrap");
// setting up words collection label
labelWordsCollection = new JLabel("Words collection:");
panelSettingsMain.add(labelWordsCollection, "gapleft 10");
// setting up selectcollection button
buttonSelectCollection = new JButton("collection");
buttonSelectCollection.setForeground(greenRegular);
buttonSelectCollection.setFocusPainted(false);
buttonSelectCollection.setBorder(null);
buttonSelectCollection.setContentAreaFilled(false);
buttonSelectCollection.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonSelectCollection,
"gapbottom 15px, wrap");
// setting up dark separator
separatorSettingsTwo = new JSeparator();
separatorSettingsTwo.setForeground(separatorGreenDark);
panelSettingsMain.add(separatorSettingsTwo,
"span 2, width 320, gapbottom 15px, wrap");
// setting up show statistics button
buttonStatistics = new JButton("Show statistics");
buttonStatistics.setForeground(greenRegular);
buttonStatistics.setFocusPainted(false);
buttonStatistics.setBorder(null);
buttonStatistics.setContentAreaFilled(false);
buttonStatistics.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonStatistics,
"gapleft 10, gapbottom 15px, , wrap");
// setting up dark separator
separatorSettingsThree = new JSeparator();
separatorSettingsThree.setForeground(separatorGreenDark);
panelSettingsMain.add(separatorSettingsThree,
"span 2, width 320, gapbottom 15px, wrap");
// setting up printing options button
buttonPrintingOptions = new JButton("Printing options");
buttonPrintingOptions.setForeground(greenRegular);
buttonPrintingOptions.setFocusPainted(false);
buttonPrintingOptions.setBorder(null);
buttonPrintingOptions.setContentAreaFilled(false);
buttonPrintingOptions.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonPrintingOptions,
"gapleft 10, gapbottom 15px, wrap");
// setting up dark separator
separatorSettingsFour = new JSeparator();
separatorSettingsFour.setForeground(separatorGreenDark);
panelSettingsMain.add(separatorSettingsFour,
"span 2, width 320, gapbottom 15px, wrap");
// setting up add new word collection button
buttonAddNewWordCollection = new JButton("Add new word collection");
buttonAddNewWordCollection.setForeground(greenRegular);
buttonAddNewWordCollection.setFocusPainted(false);
buttonAddNewWordCollection.setBorder(null);
buttonAddNewWordCollection.setContentAreaFilled(false);
buttonAddNewWordCollection.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonAddNewWordCollection,
"gapleft 10, gapbottom 15px, , wrap");
// setting up dark separator
separatorSettingsFive = new JSeparator();
separatorSettingsFive.setForeground(separatorGreenDark);
panelSettingsMain.add(separatorSettingsFive,
"span 2, width 320, gapbottom 10px, wrap");
// setting up interface customization button
buttonInterfaceCustomization = new JButton(
"Interface customization");
buttonInterfaceCustomization.setForeground(greenRegular);
buttonInterfaceCustomization.setFocusPainted(false);
buttonInterfaceCustomization.setBorder(null);
buttonInterfaceCustomization.setContentAreaFilled(false);
buttonInterfaceCustomization.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonInterfaceCustomization,
"gapleft 10, gapbottom 15px, wrap");
}
}
我正在考慮通過將JPanels(示例中的那些)設置為可見或不可見來瀏覽程序GUI。
編輯
也許我正在過度思考它,所以最終是否可以擁有大的GUI類並通過將它們設置為可見來控制不同GUI區域的可見性?
編輯
我查看了Oracle的CardLayout教程,看起來它對我的任務有好處(不包括從外部類創建JPanel,但沒關系)。 我一開始誤解了它,只是在標簽窗格(我不希望在我的項目中實現)中考慮CardLayout。
首先回答你的問題,你需要在你的JFrameTest構造函數中添加一個面板實例到這樣的東西:
add(new JPanelOne());
您還需要將按鈕直接添加到JPanelOne本身:
public class JPanelOne extends JPanel {
public JPanelOne() {
JButton button = new JButton("test");
add(button);
}
}
其次,我認為這些代碼行存在問題:
FlowLayout mainLayout = new FlowLayout();
// snip...
setLayout(mainLayout);
JPanel panelMain = new JPanel(mainLayout);
每個容器都應該有自己的布局管理器實例。 否則你的GUI會做一些奇怪的事情:
setLayout(new FlowLayout());
JPanel panelMain = new JPanel(mainLayout);
通過一些更多的幫助(來自其他網站的用戶“Hilek”),我試圖讓另一個類的JPanel在主類中消失。 這是代碼:
JFrameTest.java:
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class JFrameTest extends JFrame {
private JButton testButton;
private JPanel panelMain;
private JPanelOne panel;
public JFrameTest() {
// setting up JFrame
setLayout(null);
setPreferredSize(new Dimension(420, 90));
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// creating main JPanel (white)
panelMain = new JPanel();
panelMain.setBackground(Color.WHITE);
panelMain.setBounds(0, 0, 420, 90);
panelMain.setPreferredSize(new Dimension(200, 40));
add(panelMain);
// creating JButton in the main JPanel (white)
testButton = new JButton("Button from main class");
panelMain.add(testButton);
// creating new JPanelOne object from JPanelOne class containing black JPanel
panel = new JPanelOne();
// adding black JPanel to main JPanel (white)
panelMain.add(panel);
pack();
}
public static void main(String[] arguments) {
// creating JFrame object and setting it visible
JFrameTest frame = new JFrameTest();
frame.setVisible(true);
}
}
JPanelOne.java:
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
public class JPanelOne extends JPanel
{
public JPanelOne()
{
// setting up black JPanel
JPanel panel = new JPanel();
panel.setPreferredSize(new Dimension(220, 40));
panel.setBackground(Color.BLACK);
// creating button on external JPanel
JButton button = new JButton("Button (+JPanel) from external class");
// adding button to the black JPanel
panel.add(button);
// adding blackJPanel
add(panel);
}
}
工作示例的打印屏幕:
http://i.stack.imgur.com/qKeBp.jpg
也許有人會發現它對他們的問題很有幫助。
不要在JFrame上調用setSize()
。 而是讓布局設置其組件和GUI的適當大小。 將所有組件添加到GUI后,在JFrame上調用pack()
,然后調用setVisble(true)
。 請注意,大多數布局都比組件的大小更重視組件的preferredSize。
此外,您的單個組件上的調用setVisible(true)
是不必要的(除非您在GUI由於某種原因啟動並運行后更改其可見性)。 您還需要閱讀有關使用布局管理器的更多信息,並且在您研究它們之后可能會更少使用FlowLayout。
編輯
關於你最近的編輯:
也許我正在過度思考它,所以最終是否可以擁有大的GUI類並通過設置它們是否可見來控制不同GUI區域的可見性?
我會回答說有時這很有用,例如,如果你想將標准計算器改為科學計算器,有時最好只使用setVisible(true)顯示已經創建的填充了高級計算按鈕的JPanel。 另一方面,如果要交換GUI的“視圖”以反映其狀態的重大變化,例如字處理器從編輯模式更改為打印模式,則可以使用CardLayout輕松交換JPanel。
問題來自JPanelOne
類。 它繼承了JPanel
但在構造函數中,您創建了一個新的JPanel
,然后向其添加一個按鈕。 如果你這樣做:
public class JPanelOne extends JPanel {
public JPanelOne() {
JButton button = new JButton("test");
add(button);
}
}
它應該像你期望的那樣工作。
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