我目前正在研究一個非常簡單的IDE,用於Java中的C編程。簡而言之,我的意思是它具有次要的代碼猜測(類似於Eclipse),一些次要的自動完成(再一次,思考Eclipse)和一些語法突出顯示。我幾乎所有的東西都已經算出來了,並且粗加工出來了(例如工作,但並不漂亮或者高效),除非我在正確的語法突出顯示方面遇到了一些麻煩。JTextPane語法高亮
我的意思是說,在我的代碼JFrame中,我放入了一個JTextPane,這樣我就可以使用不同的字體,粗體,非粗體,斜體,並且相對容易地添加不同的文本顏色。我有一個與這個JTextPane相連的關鍵偵聽器,並且在每個空格鍵按下時,它抓住你剛剛寫的內容,通過「if」語句樹運行它,看看你寫的單詞是否是關鍵字。如果你這樣做,它試圖突出(或不)你剛纔寫的東西。但是,有些情況下我需要在打空格鍵之前更改顏色(例如註釋或#define語句)。沒問題,對吧?只需添加另一個「if」語句來檢測該鍵是否被按下,如果有,則更改字體顏色。那麼,這是我試圖做的,但它不工作。當我用EXACT相同的代碼來改變我使用空格鍵按下時的顏色(它的工作原理是花哨的)時,它真的讓我大惑不解。
對不起,如果沒有多大意義,我會很樂意解釋多一點,如果它是必需的。我也刪除了儘可能多的不必要的代碼,以儘量縮短它。
非常感謝您的時間!
〜美分
SSCCE:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.ArrayList;
import javax.swing.JFrame;
import javax.swing.JTextPane;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;
public class Main implements Runnable
{
private static final long serialVersionUID = 1L;
private static final int WIDTH = 800;
private static final int HEIGHT = 600;
private static final String NAME = "";
private JFrame frame;
private JTextPane textPane = new JTextPane();
private int keysPressed = -1; /* Keys pressed */
private ArrayList<Integer> keyCode = new ArrayList<Integer>(); /* List of our keyCodes */
public void run()
{
frame = new JFrame(NAME);
frame.setPreferredSize(new Dimension(WIDTH, HEIGHT));
frame.setMinimumSize(new Dimension(WIDTH, HEIGHT));
frame.setMaximumSize(new Dimension(WIDTH, HEIGHT));
frame.setResizable(false);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(textPane, BorderLayout.CENTER);
textPane.setPreferredSize(new Dimension(WIDTH, HEIGHT));
textPane.setEditable(true);
textPane.addKeyListener(new KeyListener(){
@Override
public void keyPressed(KeyEvent e)
{
int previousPos; /* Previous position of the caret */
int length; /* Length of our grabbed string */
int currentPos; /* Current position of the caret */
String text; /* The entire text of the JTextPane */
String subText; /* Our sub-string-text we're using */
String subTextP; /* Our sub-string-text plus one character*/
boolean first = true; /* Be default, it's the first letter */
StyledDocument doc = textPane.getStyledDocument();
SimpleAttributeSet sas = new SimpleAttributeSet(); /* So we can set bold, and such */
keyCode.add(new Integer(e.getKeyCode())); /* The key pressed */
keysPressed++;
currentPos = textPane.getCaretPosition(); /* The current position of the caret */
text = textPane.getText(); /* Grabbing the text on the text pane */
previousPos = text.lastIndexOf(" ", currentPos); /* Getting the last position of a space */
if(previousPos <= 0) /* If the position if before or equal to 0 */
{
previousPos = 0; /* Then the position is 0 */
}
length = currentPos - previousPos; /* The length of the string we're messing with, is between the two positions */
subText = text.substring(previousPos, currentPos); /* Grabbing the string between our two positions */
if(first) /* If this is the first letter, or insert */
{
if(keyCode.contains(KeyEvent.VK_SHIFT))
{
first = true;
subTextP = text.substring(0, 0); /* Then we want to grab it, at 0, 0 */
}
else
{
subTextP = text.substring(0, 0); /* Then we want to grab it, at 0, 0 */
first = false; /* it's no longer the first */
}
}
else /* If it isn't */
{
subTextP = text.substring(previousPos + 1, currentPos); /* Then we want to grab the usual */
}
subText = subText.replaceAll("[\\n\\t\\r]", ""); /* Getting rid of all the tabs and newlines */
subTextP = subTextP.replaceAll("[\\n\\t\\r]", ""); /*Getting rid of all the tabs and new lines */
if(keyCode.contains(KeyEvent.VK_3))
{
if(keyCode.contains(KeyEvent.VK_SHIFT))
{
System.out.println("Number sign hit!");
StyleConstants.setForeground(sas, Color.GREEN); /* Anything following a number sign will be green */
doc.setCharacterAttributes(previousPos, length, sas, false); /* Turning it green */
}
}
if(keyCode.contains(KeyEvent.VK_SPACE)) /* If a space has been hit! */
{
/* This is were we'll do all text coloring and such */
if(subText.equals(" if") || subText.equals("if") || subTextP.equals("if")) /* All things to be bolded */
{
StyleConstants.setForeground(sas, Color.GRAY); /* All of these statements will be gray... */
StyleConstants.setBold(sas, true); /* ... and bold */
doc.setCharacterAttributes(previousPos, length, sas, false); /* Making them so! */
StyleConstants.setBold(sas, false); /* We don't want these attributes to remain... */
StyleConstants.setForeground(sas, Color.black); /* ... So we're removing them. */
}
}
}
public void keyReleased(KeyEvent e)
{
for(int i = keysPressed; i >= 0; i--) /* For loop to remove all keyPresses from our list */
{
keyCode.remove(i); /* Removing the specified keyPress */
}
keysPressed = -1; /* Because the first index is 0, and we want to add one to keysPressed, we need to start below 0 */
}
@Override
public void keyTyped(KeyEvent arg0) {
}
});
frame.pack();
frame.setVisible(true);
}
public void start()
{
new Thread(this).start();
}
public final static void main(String args[])
{
new Main().start();
}
}
編輯:
要重現該問題,運行上面提供的代碼。在textPane中,輸入單詞「if」(不含引號),然後點擊空格鍵。這個詞現在應該是粗體的,並且是灰色的。現在,嘗試在它後面輸入「#」(不包括引號),(空格)和空格或任何其他鍵。什麼都沒發生。但是,系統應該打印出「號碼命中!」一旦你輸入「#」,意味着代碼實際上仍然可以訪問。另外請注意,我使用相同的代碼(除了更改顏色)「#」的代碼,就像我爲「if」所做的那樣。希望能幫助你們更多地理解問題。
將發佈的代碼更改爲SSCCE,並添加了重現該問題的步驟。感謝您的提示! – centip3de
我輸入「if#」,然後看到「數字符號命中!」在控制檯中。有什麼問題? – StanislavL
正如您在閱讀重現問題的步驟或原始文章本身所閱讀的那樣,問題在於數字符號及其後面的所有內容都應該是綠色的,而不是。 – centip3de