如何在记事本中放大和缩小 JtextArea
[英]How to Zoom In and Out of the JtextArea in a notepad
问题描述
I am making a notepad using java swing GUI and I am kind of stuck in the zoom in and out part and have looked at so many websites that claim that they have the answer but every time I get out of the website with no knowledge of the subject.
我正在使用 java swing GUI 制作记事本，我有点卡在放大和缩小部分，并查看了许多声称他们有答案的网站，但每次我离开网站时都不知道主题。 I have made a java class for each menu so that I don't get lost on too many lines of code and here is the main code that I wrote.我为每个菜单制作了 java class，这样我就不会迷失在太多的代码行中，这是我编写的主要代码。
import javax.swing.*;
import javax.swing.text.DefaultEditorKit;
import javax.swing.undo.UndoManager;
import java.awt.event.*;
public class Notepad implements ActionListener {
JFrame wind;
JTextArea textA;
boolean wordWrapOn = true;
JScrollPane scrollPane;
JMenuBar menuBar;
JMenu file, edit, view, help;
JMenuItem newI, openI,saveI, saveAsI, printI, exit;
Function_File fil = new Function_File(this);
Function_View function_view = new Function_View(this);
Function_Edit function_edit = new Function_Edit(this);
Function_Help function_help = new Function_Help(this);
JMenuItem iFontArial, iFontCSMS, iFontTNR, iFontSize8, iFontSize12, iFontSize16, iFontSize20, iFontSize24, iFontSize28;
JMenuItem color1, color2, color3, color4, color5, color6, BColor1, BColor2, BColor3, BColor4, BColor5, BColor6;
JMenu menuFont, menuFontSize , menuColor, menuBColor;
JMenuItem iUndo, iRedo, iCut, iCopy, iPaste, iDelete, iSelectAll;
JMenuItem vHelp,about;
JMenuItem findAndReplace;
JMenu zoom;
JMenuItem zoomIn, zoomOut;
JCheckBoxMenuItem iWrap;
UndoManager undoManager= new UndoManager();
public static void main(String[] args){
new Notepad();
}
public Notepad(){
createWind();
createTextA();
createMenuBar();
createFileM();
createViewMenu();
createEditMenu();
createHelpMenu();
function_view.selectedFont = "Arial";
function_view.createFont(16);
function_view.wordWrap();
wind.setVisible(true);
ImageIcon icon = new ImageIcon("C:\\Users\\Moatassim\\Downloads\\473800-512.png");
wind.setIconImage(icon.getImage());
}
public void createWind(){
wind = new JFrame("Notepad");
wind.setSize(700, 740);
wind.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void createTextA(){
textA = new JTextArea();
textA.getDocument().addUndoableEditListener(e -> undoManager.addEdit(e.getEdit()));
scrollPane = new JScrollPane(textA, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollPane.setBorder(BorderFactory.createEmptyBorder());
wind.add(scrollPane);
}
public void createMenuBar(){
menuBar = new JMenuBar();
wind.setJMenuBar(menuBar);
file = new JMenu("File");
menuBar.add(file);
edit = new JMenu("Edit");
menuBar.add(edit);
view = new JMenu("View");
menuBar.add(view);
help = new JMenu("Help");
menuBar.add(help);
}
public void createFileM(){
newI = new JMenuItem("New");
newI.addActionListener(this);
newI.setActionCommand("New");
file.add(newI);
newI.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\134224-16.png"));
KeyStroke keyStrokeToNew = KeyStroke.getKeyStroke(KeyEvent.VK_N, KeyEvent.CTRL_DOWN_MASK);
newI.setAccelerator(keyStrokeToNew);
openI = new JMenuItem("Open");
openI.addActionListener(this);
openI.setActionCommand("Open");
file.add(openI);
openI.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\352375-16.png"));
KeyStroke keyStrokeToOpen = KeyStroke.getKeyStroke(KeyEvent.VK_O, KeyEvent.CTRL_DOWN_MASK);
openI.setAccelerator(keyStrokeToOpen);
saveI = new JMenuItem("Save");
saveI.addActionListener(this);
saveI.setActionCommand("Save");
file.add(saveI);
saveI.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\1608823-16.png"));
KeyStroke keyStrokeToSave = KeyStroke.getKeyStroke(KeyEvent.VK_S, KeyEvent.CTRL_DOWN_MASK);
saveI.setAccelerator(keyStrokeToSave);
saveAsI = new JMenuItem("Save As");
saveAsI.addActionListener(this);
saveAsI.setActionCommand("Save As");
file.add(saveAsI);
saveAsI.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\1608823-16.png"));
KeyStroke keyStrokeToSaveAs = KeyStroke.getKeyStroke(KeyEvent.VK_F, KeyEvent.CTRL_DOWN_MASK);
saveAsI.setAccelerator(keyStrokeToSaveAs);
printI = new JMenuItem("Print");
printI.addActionListener(this);
printI.setActionCommand("Print");
file.add(printI);
printI.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\172530-16.png"));
KeyStroke keyStrokeToPrint = KeyStroke.getKeyStroke(KeyEvent.VK_P, KeyEvent.CTRL_DOWN_MASK);
printI.setAccelerator(keyStrokeToPrint);
exit = new JMenuItem("Exit");
exit.addActionListener(this);
exit.setActionCommand("Exit");
file.add(exit);
exit.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\3005766-16.png"));
}
public void createEditMenu(){
iUndo = new JMenuItem("Undo");
iUndo.addActionListener(this);
iUndo.setActionCommand("Undo");
edit.add(iUndo);
iUndo.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\2931166-16.png"));
KeyStroke keyStrokeToUndo = KeyStroke.getKeyStroke(KeyEvent.VK_Z, KeyEvent.CTRL_DOWN_MASK);
iUndo.setAccelerator(keyStrokeToUndo);
iRedo = new JMenuItem("Redo");
iRedo.addActionListener(this);
iRedo.setActionCommand("Redo");
edit.add(iRedo);
iRedo.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\2931165-16.png"));
KeyStroke keyStrokeToRedo = KeyStroke.getKeyStroke(KeyEvent.VK_R, KeyEvent.CTRL_DOWN_MASK);
iRedo.setAccelerator(keyStrokeToRedo);
iCut = new JMenuItem(new DefaultEditorKit.CutAction());
iCut.addActionListener(this);
iCut.setText("Cut");
iCut.setActionCommand("Cut");
edit.add(iCut);
iCut.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\352286-16.png"));
KeyStroke keyStrokeToCut = KeyStroke.getKeyStroke(KeyEvent.VK_X, KeyEvent.CTRL_DOWN_MASK);
iCut.setAccelerator(keyStrokeToCut);
iCopy = new JMenuItem(new DefaultEditorKit.CopyAction());
iCopy.addActionListener(this);
iCopy.setText("Copy");
iCopy.setActionCommand("Copy");
edit.add(iCopy);
iCopy.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\2849804-16.png"));
KeyStroke keyStrokeToCopy = KeyStroke.getKeyStroke(KeyEvent.VK_C, KeyEvent.CTRL_DOWN_MASK);
iCopy.setAccelerator(keyStrokeToCopy);
iPaste = new JMenuItem(new DefaultEditorKit.PasteAction());
iPaste.addActionListener(this);
iPaste.setActionCommand("Paste");
iPaste.setText("Paste");
edit.add(iPaste);
iPaste.setVisible(true);
iPaste.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\326599-16.png"));
KeyStroke keyStrokeToPaste = KeyStroke.getKeyStroke(KeyEvent.VK_V, KeyEvent.CTRL_DOWN_MASK);
iPaste.setAccelerator(keyStrokeToPaste);
iDelete = new JMenuItem("Delete");
iDelete.addActionListener(this);
iDelete.setActionCommand("Delete");
edit.add(iDelete);
iDelete.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\3669361-16.png"));
KeyStroke keyStrokeToDelete = KeyStroke.getKeyStroke(KeyEvent.VK_D, KeyEvent.CTRL_DOWN_MASK);
iDelete.setAccelerator(keyStrokeToDelete);
iSelectAll = new JMenuItem("Select All");
iSelectAll.addActionListener(this);
iSelectAll.setActionCommand("Select All");
edit.add(iSelectAll);
iSelectAll.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\5760429-16.png"));
KeyStroke keyStrokeToSelectAll = KeyStroke.getKeyStroke(KeyEvent.VK_A, KeyEvent.CTRL_DOWN_MASK);
iSelectAll.setAccelerator(keyStrokeToSelectAll);
findAndReplace = new JMenuItem("Find & Replace");
findAndReplace.addActionListener(this);
findAndReplace.setActionCommand("Find & Replace");
edit.add(findAndReplace);
findAndReplace.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\find-and-replace.png"));
KeyStroke keyStrokeToFAR = KeyStroke.getKeyStroke(KeyEvent.VK_H, KeyEvent.CTRL_DOWN_MASK);
findAndReplace.setAccelerator(keyStrokeToFAR);
}
public void createHelpMenu(){
vHelp = new JMenuItem("Help");
vHelp.addActionListener(this);
vHelp.setActionCommand("Help");
help.add(vHelp);
vHelp.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\3669173-16.png"));
about = new JMenuItem("About Notepad");
about.addActionListener(this);
about.setActionCommand("About Notepad");
help.add(about);
about.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\2931180-16.png"));
}
public void createViewMenu(){
iWrap = new JCheckBoxMenuItem("Word Wrap : OFF");
iWrap.addActionListener(this);
iWrap.setActionCommand("Word Wrap");
view.add(iWrap);
zoom = new JMenu("Zoom");
zoom.addActionListener(this);
zoom.setActionCommand("Zoom");
zoom.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\326690-16.png"));
view.add(zoom);
zoomIn = new JMenuItem("Zoom In");
zoomIn.addActionListener(this);
zoomIn.setActionCommand("Zoom In");
zoomIn.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\3643761-16.png"));
zoom.add(zoomIn);
zoomOut = new JMenuItem("Zoom Out");
zoomOut.addActionListener(this);
zoomOut.setActionCommand("Zoom Out");
zoomOut.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\3643760-16.png"));
zoom.add(zoomOut);
menuFont = new JMenu("Font");
view.add(menuFont);
menuFont.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\1608890-16.png"));
iFontArial = new JMenuItem("Arial");
iFontArial.addActionListener(this);
iFontArial.setActionCommand("Arial");
menuFont.add(iFontArial);
iFontCSMS = new JMenuItem("Comic Sans MS");
iFontCSMS.addActionListener(this);
iFontCSMS.setActionCommand("Comic Sans MS");
menuFont.add(iFontCSMS);
iFontTNR = new JMenuItem("Times New Roman");
iFontTNR.addActionListener(this);
iFontTNR.setActionCommand("Times New Roman");
menuFont.add(iFontTNR);
menuFontSize = new JMenu("Font Size");
view.add(menuFontSize);
menuFontSize.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\451442-16.png"));
iFontSize8 = new JMenuItem("8");
iFontSize8.addActionListener(this);
iFontSize8.setActionCommand("size8");
menuFontSize.add(iFontSize8);
iFontSize12 = new JMenuItem("12");
iFontSize12.addActionListener(this);
iFontSize12.setActionCommand("size12");
menuFontSize.add(iFontSize12);
iFontSize16 = new JMenuItem("16");
iFontSize16.addActionListener(this);
iFontSize16.setActionCommand("size16");
menuFontSize.add(iFontSize16);
iFontSize20 = new JMenuItem("20");
iFontSize20.addActionListener(this);
iFontSize20.setActionCommand("size20");
menuFontSize.add(iFontSize20);
iFontSize24 = new JMenuItem("24");
iFontSize24.addActionListener(this);
iFontSize24.setActionCommand("size24");
menuFontSize.add(iFontSize24);
iFontSize28 = new JMenuItem("28");
iFontSize28.addActionListener(this);
iFontSize28.setActionCommand("size28");
menuFontSize.add(iFontSize28);
menuColor = new JMenu("Color");
menuColor.addActionListener(this);
menuColor.setActionCommand("Color");
view.add(menuColor);
menuColor.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\6140920-16.png"));
color1 = new JMenuItem("Gray");
color1.addActionListener(this);
color1.setActionCommand("Gray");
menuColor.add(color1);
color2 = new JMenuItem("Black");
color2.addActionListener(this);
color2.setActionCommand("Black");
menuColor.add(color2);
color3 = new JMenuItem("Blue");
color3.addActionListener(this);
color3.setActionCommand("Blue");
menuColor.add(color3);
color4 = new JMenuItem("Red");
color4.addActionListener(this);
color4.setActionCommand("Red");
menuColor.add(color4);
color5 = new JMenuItem("Green");
color5.addActionListener(this);
color5.setActionCommand("Green");
menuColor.add(color5);
color6 = new JMenuItem("White");
color6.addActionListener(this);
color6.setActionCommand("White");
menuColor.add(color6);
menuBColor = new JMenu("Background Col.");
menuBColor.addActionListener(this);
menuBColor.setActionCommand("Background Col.");
view.add(menuBColor);
menuBColor.setIcon(new ImageIcon("C:\\Users\\Moatassim\\Downloads\\4243299-16.png"));
BColor1 = new JMenuItem("gray");
BColor1.addActionListener(this);
BColor1.setActionCommand("gray");
menuBColor.add(BColor1);
BColor2 = new JMenuItem("black");
BColor2.addActionListener(this);
BColor2.setActionCommand("black");
menuBColor.add(BColor2);
BColor3 = new JMenuItem("blue");
BColor3.addActionListener(this);
BColor3.setActionCommand("blue");
menuBColor.add(BColor3);
BColor4 = new JMenuItem("red");
BColor4.addActionListener(this);
BColor4.setActionCommand("red");
menuBColor.add(BColor4);
BColor5 = new JMenuItem("green");
BColor5.addActionListener(this);
BColor5.setActionCommand("green");
menuBColor.add(BColor5);
BColor6 = new JMenuItem("white");
BColor6.addActionListener(this);
BColor6.setActionCommand("white");
menuBColor.add(BColor6);
}
@Override
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
switch (command) {
case "New" -> fil.newFile();
case "Open" -> fil.open();
case "Save" -> fil.save();
case "Save As" -> fil.saveAs();
case "Exit" -> fil.exit();
case "Word Wrap" -> function_view.wordWrap();
case "Arial" -> function_view.setFont("Arial");
case "Comic Sans MS" -> function_view.setFont("Comic Sans MS");
case "Times New Roman" -> function_view.setFont("Times New Roman");
case "size8" -> function_view.createFont(8);
case "size12" -> function_view.createFont(12);
case "size16" -> function_view.createFont(16);
case "size20" -> function_view.createFont(20);
case "size24" -> function_view.createFont(24);
case "size28" -> function_view.createFont(28);
case "Gray" -> function_view.changeColor("Gray");
case "Black" -> function_view.changeColor("Black");
case "Blue" -> function_view.changeColor("Blue");
case "Red" -> function_view.changeColor("Red");
case "Green" -> function_view.changeColor("Green");
case "White" -> function_view.changeColor("White");
case "gray" -> function_view.changeBColor("Gray");
case "black" -> function_view.changeBColor("Black");
case "blue" -> function_view.changeBColor("Blue");
case "red" -> function_view.changeBColor("Red");
case "green" -> function_view.changeBColor("Green");
case "white" -> function_view.changeBColor("White");
case "Undo" -> function_edit.undo();
case "Redo" -> function_edit.redo();
case "About Notepad" -> function_help.createAbout();
case "Help" -> function_help.createHelp();
case "Delete" -> function_edit.delete();
case "Select All" -> function_edit.selectAll();
case "Print" -> fil.print();
}
}
}
1 个解决方案
解决方案1
1 2021-04-05 22:03:55
I don't know how you actually want to apply the zoom (zoom factor from menu selection, from Mouse Wheel, or whatever) but I will try to provide the means to do this via the mouse wheel.我不知道您实际上想要如何应用缩放（来自菜单选择、鼠标滚轮或其他的缩放因子），但我会尝试提供通过鼠标滚轮执行此操作的方法。 That is rather, the keyboard CTRL key is held down and the Mouse Wheel is scrolled in either up (zoom up) or down (zoom down).也就是说，按住键盘CTRL键并向上（放大）或向下（缩小）滚动鼠标滚轮。
Here is your createTextA() method.这是您的createTextA()方法。 I have added a MouseWheel Listener to to the JScrollPane for the JTextArea component:我在 JTextArea 组件的 JScrollPane 中添加了一个 MouseWheel 侦听器：
public void createTextA() {
textA = new JTextArea();
textA.getDocument().addUndoableEditListener(e -> undoManager.addEdit(e.getEdit()));
scrollPane = new JScrollPane(textA, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollPane.addMouseWheelListener(new java.awt.event.MouseWheelListener() {
@Override
public void mouseWheelMoved(java.awt.event.MouseWheelEvent evt) {
if (evt.isControlDown()) {
textA.setFont(new java.awt.Font(textA.getFont().getFontName(), textA.getFont().getStyle(),
evt.getUnitsToScroll() > 0 ? textA.getFont().getSize() - 2
: textA.getFont().getSize() + 2));
}
}
});
scrollPane.setBorder(BorderFactory.createEmptyBorder());
wind.add(scrollPane);
}
How does this work:这是如何运作的：
Quite simply, it changes the font size for the JTextArea component.很简单，它改变了 JTextArea 组件的字体大小。 The mouse wheel listener is applied to the JScrollPane which is home for the JTextArea component so as to not interfere with the normal scrolling process for the JTextArea which can happen if directly applied to the JTextArea component itself.鼠标滚轮侦听器应用于 JTextArea 组件所在的 JScrollPane，以免干扰 JTextArea 的正常滚动过程，如果直接应用于 JTextArea 组件本身可能会发生这种情况。
The Ternary Operator used within the mouseWheelMoved event merely determines whether or not the font is increased or decreased dependent upon the direction of the mouse wheel scroll. mouseWheelMoved事件中使用的 三元运算符仅根据鼠标滚轮滚动的方向确定字体是增加还是减少。
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