我正在尝试在Java中显示工具提示,该提示可能不是段落长度。如何自动换行长提示?
我正在尝试在Java中显示工具提示,该提示可能不是段落长度。如何自动换行长提示?
Answers:
如果将工具提示包装在<html>
和</html>
标记中,则可以使用<br>
标记。有关示例和讨论,请参见http://www.jguru.com/faq/view.jsp?EID=10653。
或者,您可以使用JMultiLineToolTip类,该类可以在网上找到很多地方,包括 https://github.com/ls-cwi/yoshiko-app/blob/master/src/main/java/com/yoshiko/internal/查看/JMultiLineToolTip.java
工具提示文字,以“<html>
”将被视为HTML。当然,这可能是非常广泛的HTML。
您可以重写JComponent.createTooltip,以用您自己的组件替换工具提示,该组件可以显示您喜欢的内容。
我知道这已经很老了,但是我发现了一个使用HTML代码的简单解决方案!
只需使用固定宽度的HTML段落即可:
setToolTipText("<html><p width=\"500\">" +value+"</p></html>");
可以对此进行一些改进,但是我的方法是在设置工具提示之前调用了一个辅助函数,该工具以指定的长度分割工具提示文本,但在可能的情况下进行了调整,以使单词在空格处中断。
import java.util.ArrayList;
import java.util.List;
/**
*
*/
public class MultiLineTooltips
{
private static int DIALOG_TOOLTIP_MAX_SIZE = 75;
private static final int SPACE_BUFFER = 10;
public static String splitToolTip(String tip)
{
return splitToolTip(tip,DIALOG_TOOLTIP_MAX_SIZE);
}
public static String splitToolTip(String tip,int length)
{
if(tip.length()<=length + SPACE_BUFFER )
{
return tip;
}
List<String> parts = new ArrayList<>();
int maxLength = 0;
String overLong = tip.substring(0, length + SPACE_BUFFER);
int lastSpace = overLong.lastIndexOf(' ');
if(lastSpace >= length)
{
parts.add(tip.substring(0,lastSpace));
maxLength = lastSpace;
}
else
{
parts.add(tip.substring(0,length));
maxLength = length;
}
while(maxLength < tip.length())
{
if(maxLength + length < tip.length())
{
parts.add(tip.substring(maxLength, maxLength + length));
maxLength+=maxLength+length;
}
else
{
parts.add(tip.substring(maxLength));
break;
}
}
StringBuilder sb = new StringBuilder("<html>");
for(int i=0;i<parts.size() - 1;i++)
{
sb.append(parts.get(i)+"<br>");
}
sb.append(parts.get(parts.size() - 1));
sb.append(("</html>"));
return sb.toString();
}
}
使用方式
jComponent.setToolTipText(MultiLineTooltips.splitToolTip(TOOLTIP));
这是我以前使用过的版本,如果您从ResourceBundles加载工具提示,它会很好用:
import javax.swing.JComponent;
import javax.swing.JToolTip;
import javax.swing.LookAndFeel;
import javax.swing.UIManager;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.ToolTipUI;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.util.regex.Pattern;
/**
* A tooltip that wraps multi-line text.
*/
public final class MultiLineToolTipUI extends ToolTipUI {
private static final int INSET = 2;
private static final Pattern LINE_SPLITTER = Pattern.compile("$", Pattern.MULTILINE);
private static final MultiLineToolTipUI SHARED_INSTANCE = new MultiLineToolTipUI();
/**
* Install the multi-line tooltip into the UI manager.
*/
public static void installUI() {
String toolTipUI = MultiLineToolTipUI.class.getName();
UIManager.put("ToolTipUI", toolTipUI);
UIManager.put(toolTipUI, MultiLineToolTipUI.class);
}
@SuppressWarnings("UnusedDeclaration")
public static ComponentUI createUI(JComponent c) {
return SHARED_INSTANCE;
}
private MultiLineToolTipUI() {}
@Override
public Dimension getMaximumSize(JComponent c) {
return getPreferredSize(c);
}
@Override
public Dimension getMinimumSize(JComponent c) {
return getPreferredSize(c);
}
@Override
public Dimension getPreferredSize(JComponent c) {
String[] lines = LINE_SPLITTER.split(((JToolTip) c).getTipText());
if (lines.length == 0) {
return new Dimension(2 * INSET, 2 * INSET);
}
FontMetrics metrics = c.getFontMetrics(c.getFont());
Graphics g = c.getGraphics();
int w = 0;
for (String line : lines) {
w = Math.max(w, (int) metrics.getStringBounds(line, g).getWidth());
}
int h = lines.length * metrics.getHeight();
return new Dimension(w + 2 * INSET, h + 2 * INSET);
}
@Override
public void installUI(JComponent c) {
LookAndFeel.installColorsAndFont(c, "ToolTip.background", "ToolTip.foreground", "ToolTip.font");
LookAndFeel.installBorder(c, "ToolTip.border");
}
@Override
public void paint(Graphics g, JComponent c) {
int w = c.getWidth(), h = c.getHeight();
g.setColor(c.getBackground());
g.fillRect(0, 0, w, h);
g.setColor(c.getForeground());
g.drawRect(0, 0, w, h);
String[] lines = LINE_SPLITTER.split(((JToolTip) c).getTipText());
if (lines.length != 0) {
FontMetrics metrics = c.getFontMetrics(c.getFont());
int height = metrics.getHeight();
int y = INSET + metrics.getAscent();
for (String line : lines) {
g.drawString(line, INSET, y);
y += height;
}
}
}
@Override
public void uninstallUI(JComponent c) {
LookAndFeel.uninstallBorder(c);
}
}
在创建UI之前,您可以通过调用此方法来使用它:
MultiLineToolTipUI.installUI();
然后,在属性文件中,只需插入换行符即可根据需要包装工具提示。
我创建了一个实用程序类,该实用程序类使用<br>
标签自动将字符串格式化为特定长度。它基于Paul Taylor发布的MultiLineToolTips类,但是他有一个错误,该错误会跳过字符串的某些部分,并且实际上并未将字符串限制为特定长度。
要使用我的类,只需通过编写MultiLineToolTips.splitToolTip(yourString);
或MultiLineToolTips.splitToolTip(yourString, maxLength);
如果要将其拆分为特定的最大长度,即可调用splitToolTip方法。这将创建格式正确的工具提示字符串。
import java.util.ArrayList;
import java.util.List;
/** A helper class to split strings into a certain length,
* formatted with html {@literal<br>} tags for multi-line tool tips.
* Based on the MultiLineToolTips class posted by
* <a href="https://stackoverflow.com/users/1480018/paul-taylor">Paul Taylor</a>
* on <a href="https://stackoverflow.com/a/13503677/9567822">Stack Overflow</a>
* @author <a href="https://stackoverflow.com/users/9567822/andrew-lemaitre?tab=profile">Andrew LeMaitre</a>
*/
public final class MultiLineToolTips {
/** Private constructor for utility class. */
private MultiLineToolTips() {
}
/** Default max length of the tool tip when split with {@link #splitToolTip(String)}. */
private static final int DIALOG_TOOLTIP_MAX_SIZE = 75;
/** A function that splits a string into sections of {@value #DIALOG_TOOLTIP_MAX_SIZE} characters or less.
* If you want the lines to be shorter or longer call {@link #splitToolTip(String, int)}.
* @param toolTip The tool tip string to be split
* @return the tool tip string with HTML formatting to break it into sections of the correct length
*/
public static String splitToolTip(final String toolTip) {
return splitToolTip(toolTip, DIALOG_TOOLTIP_MAX_SIZE);
}
/** An overloaded function that splits a tool tip string into sections of a specified length.
* @param toolTip The tool tip string to be split
* @param desiredLength The maximum length of the tool tip per line
* @return The tool tip string with HTML formatting to break it into sections of the correct length
*/
public static String splitToolTip(final String toolTip, final int desiredLength) {
if (toolTip.length() <= desiredLength) {
return toolTip;
}
List<String> parts = new ArrayList<>();
int stringPosition = 0;
while (stringPosition < toolTip.length()) {
if (stringPosition + desiredLength < toolTip.length()) {
String tipSubstring = toolTip.substring(stringPosition, stringPosition + desiredLength);
int lastSpace = tipSubstring.lastIndexOf(' ');
if (lastSpace == -1 || lastSpace == 0) {
parts.add(toolTip.substring(stringPosition, stringPosition + desiredLength));
stringPosition += desiredLength;
} else {
parts.add(toolTip.substring(stringPosition, stringPosition + lastSpace));
stringPosition += lastSpace;
}
} else {
parts.add(toolTip.substring(stringPosition));
break;
}
}
StringBuilder sb = new StringBuilder("<html>");
for (int i = 0; i < parts.size() - 1; i++) {
sb.append(parts.get(i) + "<br>");
}
sb.append(parts.get(parts.size() - 1));
sb.append(("</html>"));
return sb.toString();
}
}