SWT(JFace)体验之StyledText类

最新推荐文章于 2021-09-23 23:20:32 发布

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本文介绍使用Eclipse SWT库创建不同样式的文本输入框，包括普通文本、带换行的多行文本、密码框及使用StyledText实现高亮显示等复杂功能。

有的时候Text需要实现这种那种的样式。

先提供在不使用StyledText类的情况：

WrapLines.java

package swt_jface.demo4; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; public class WrapLines { Display display = new Display(); Shell shell = new Shell(display); Text text1; Text text2; String line = "abcdefghijklmnopqrstuvwxyz0123456789"; private void init() { text1 = new Text(shell, SWT.BORDER | SWT.MULTI); //text.setTextLimit(12); text1.setText(line); text2 = new Text(shell, SWT.BORDER | SWT.WRAP); text2.setText(line); } public WrapLines() { shell.setLayout(new GridLayout(2, true)); (new Label(shell, SWT.NULL)).setText("SWT.BORDER |/nSWT.MUTLI"); (new Label(shell, SWT.NULL)).setText("SWT.BORDER |/nSWT.WRAP"); init(); GridData gridData = new GridData(GridData.FILL_BOTH); text1.setLayoutData(gridData); gridData = new GridData(GridData.FILL_BOTH); text2.setLayoutData(gridData); shell.pack(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } public static void main(String[] args) { new WrapLines(); } }

RemarksText.java

package swt_jface.demo4; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.events.VerifyEvent; import org.eclipse.swt.events.VerifyListener; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; public class RemarksText { Display display = new Display(); Shell shell = new Shell(display); Text text; public RemarksText() { shell.setLayout(new GridLayout(1, false)); (new Label(shell, SWT.NULL)).setText("Remarks:"); text = new Text(shell, SWT.MULTI | SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL); text.setText("123456789"); text.setLayoutData(new GridData(GridData.FILL_BOTH)); System.out.println("getText: " + text.getText(1, 6)); char[] chars = text.getLineDelimiter().toCharArray(); for (int i = 0; i < chars.length; i++) { System.out.println("Line delimiter #" + i + ": " + Integer.toHexString(chars[i]) ); } text.getOrientation(); System.out.println("Number of chars: " + text.getCharCount()); System.out.println("Tabs: " + text.getTabs()); text.addVerifyListener(new VerifyListener() { public void verifyText(VerifyEvent e) { if(e.end == e.start) { if( e.character == ' ' && (e.stateMask & SWT.CTRL) != 0 ) { if(text.getText(e.end-1, e.end-1).equals("V")) { e.text = "erifyListener"; }else{ e.doit = false; } } } } }); text.addModifyListener(new ModifyListener() { public void modifyText(ModifyEvent e) { System.out.println("New character count: " + text.getCharCount()); } }); // text.append("a"); text.setSelection(1, 4); System.out.println("getSelection:/t" + text.getSelection()); System.out.println("getSelectionCount:/t" + text.getSelectionCount()); System.out.println("getSelectionText:/t" + text.getSelectionText()); //text.insert("ABC"); // shell.pack(); shell.setSize(300, 150); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } public static void main(String[] args) { new RemarksText(); } }

再比如密码框：

UserPassword.java

package swt_jface.demo4; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; public class UserPassword { Display display = new Display(); Shell shell = new Shell(display); Text textUser; Text textPassword; private void init() { (new Label(shell, SWT.NULL)).setText("User name: "); textUser = new Text(shell, SWT.SINGLE | SWT.BORDER); textUser.setText("default_user"); textUser.setTextLimit(16); (new Label(shell, SWT.NULL)).setText("Password: "); textPassword = new Text(shell, SWT.SINGLE | SWT.BORDER); System.out.println(textPassword.getEchoChar()); textPassword.setEchoChar('*'); } public UserPassword() { shell.setLayout(new GridLayout(2, false)); init(); textUser.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); textPassword.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); shell.pack(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } public static void main(String[] args) { new UserPassword(); } }

下面演示使用StyledText类进行修饰Text的几个例子：

HighlightOddLine.java

package swt_jface.demo4; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.LineBackgroundEvent; import org.eclipse.swt.custom.LineBackgroundListener; import org.eclipse.swt.custom.StyledText; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class HighlightOddLine { Display display = new Display(); Shell shell = new Shell(display); StyledText styledText; public HighlightOddLine() { shell.setLayout(new GridLayout()); styledText = new StyledText(shell, SWT.MULTI | SWT.WRAP | SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL); styledText.setLayoutData(new GridData(GridData.FILL_BOTH)); styledText.addLineBackgroundListener(new LineBackgroundListener() { public void lineGetBackground(LineBackgroundEvent event) { if(styledText.getLineAtOffset(event.lineOffset) % 2 == 1) event.lineBackground = shell.getDisplay().getSystemColor(SWT.COLOR_YELLOW); } }); styledText.setText("Line 0/r/nLine 1/r/nLine 2/r/nLine 3/r/nLine 4/r/nLine 5/r/nLine 6"); shell.setSize(300, 150); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } public static void main(String[] args) { new HighlightOddLine(); } }

SetLineBackground.java

SearchStyleText.java

package swt_jface.demo4; import java.util.LinkedList; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.LineStyleEvent; import org.eclipse.swt.custom.LineStyleListener; import org.eclipse.swt.custom.StyleRange; import org.eclipse.swt.custom.StyledText; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; public class SearchStyleText { Display display = new Display(); Shell shell = new Shell(display); StyledText styledText; Text keywordText; Button button; String keyword; public SearchStyleText() { shell.setLayout(new GridLayout(2, false)); styledText = new StyledText(shell, SWT.MULTI | SWT.WRAP | SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL); GridData gridData = new GridData(GridData.FILL_BOTH); gridData.horizontalSpan = 2; styledText.setLayoutData(gridData); keywordText = new Text(shell, SWT.SINGLE | SWT.BORDER); keywordText.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); Font font = new Font(shell.getDisplay(), "Courier New", 12, SWT.NORMAL); styledText.setFont(font); button = new Button(shell, SWT.PUSH); button.setText("Search"); button.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { keyword = keywordText.getText(); styledText.redraw(); } }); styledText.addLineStyleListener(new LineStyleListener() { public void lineGetStyle(LineStyleEvent event) { if(keyword == null || keyword.length() == 0) { event.styles = new StyleRange[0]; return; } String line = event.lineText; int cursor = -1; LinkedList list = new LinkedList(); while( (cursor = line.indexOf(keyword, cursor+1)) >= 0) { list.add(getHighlightStyle(event.lineOffset+cursor, keyword.length())); } event.styles = (StyleRange[]) list.toArray(new StyleRange[list.size()]); } }); keyword = "SW"; styledText.setText("AWT, SWING /r/nSWT & JFACE"); shell.pack(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } private StyleRange getHighlightStyle(int startOffset, int length) { StyleRange styleRange = new StyleRange(); styleRange.start = startOffset; styleRange.length = length; styleRange.background = shell.getDisplay().getSystemColor(SWT.COLOR_YELLOW); return styleRange; } public static void main(String[] args) { new SearchStyleText(); } }

SampleStyledText.java

package swt_jface.demo4; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.StyleRange; import org.eclipse.swt.custom.StyledText; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class SampleStyledText { Display display = new Display(); Shell shell = new Shell(display); StyledText styledText; public SampleStyledText() { shell.setLayout(new GridLayout()); styledText = new StyledText(shell, SWT.MULTI | SWT.WRAP | SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL); styledText.setLayoutData(new GridData(GridData.FILL_BOTH)); Font font = new Font(shell.getDisplay(), "Courier New", 12, SWT.NORMAL); styledText.setFont(font); styledText.setText("123456789/r/nABCDEFGHI"); StyleRange styleRange1 = new StyleRange(); styleRange1.start = 2; styleRange1.length = 16; styleRange1.foreground = shell.getDisplay().getSystemColor(SWT.COLOR_BLUE); styleRange1.background = shell.getDisplay().getSystemColor(SWT.COLOR_YELLOW); styleRange1.fontStyle = SWT.BOLD; StyleRange styleRange2 = new StyleRange(); styleRange2.start = 14; styleRange2.length = 3; styleRange2.fontStyle = SWT.NORMAL; styleRange2.foreground = shell.getDisplay().getSystemColor(SWT.COLOR_YELLOW); styleRange2.background = shell.getDisplay().getSystemColor(SWT.COLOR_BLUE); // styledText.setStyleRange(styleRange1); // styledText.setStyleRange(styleRange2); //styledText.setStyleRanges(new StyleRange[]{styleRange1, styleRange2}); //styledText.setStyleRanges(new StyleRange[]{styleRange2, styleRange1}); //styledText.setLineBackground(1, 1, shell.getDisplay().getSystemColor(SWT.COLOR_GRAY)); // styledText.setSelection(4); // System.out.println(printStyleRanges(styledText.getStyleRanges()) ); // styledText.insert("000"); System.out.println(printStyleRanges(styledText.getStyleRanges()) ); // styledText.setStyleRanges(new StyleRange[]{styleRange1}); // System.out.println(printStyleRanges(styledText.getStyleRanges()) ); //shell.pack(); shell.setSize(300, 120); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } private String printStyleRanges(StyleRange[] styleRanges) { if(styleRanges == null) return "null"; else if(styleRanges.length == 0) return "[]"; StringBuffer sb = new StringBuffer(); for(int i=0; i<styleRanges.length; i++) { sb.append(styleRanges[i] + "/n"); } return sb.toString(); } public static void main(String[] args) { new SampleStyledText(); } }