java 将鼠标悬停在 JButton 上并显示一条消息
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Hovering over JButtons and displaying a message
提问by nsc010
I want to hover over a number of JButtons on my GUI (map) and display the name of that location e.g. Manchester and London. I have the code working for one button, but it does not work for more than one button and prints the last outmessage (as i have 10 buttons) for all button locations.
我想将鼠标悬停在 GUI（地图）上的多个 JButton 上并显示该位置的名称，例如曼彻斯特和伦敦。我的代码适用于一个按钮，但它不适用于多个按钮并打印out所有按钮位置的最后一条消息（因为我有 10 个按钮）。
If button1is true it then draws the text on the GUI in the specified area via my paintComponent()method.
如果button1为真，则通过我的paintComponent()方法在指定区域的 GUI 上绘制文本。
How can i resolve this?
我该如何解决这个问题？
button1.addMouseMotionListener(this);
button2.addMouseMotionListener(this);
public void mouseMoved(MouseEvent arg0)
{
if(button1.contains(arg0.getPoint()))
{
button1 = true;
out = "test 1";
repaint();
}
if(!button1.contains(arg0.getPoint()))
{
b1 = false;
out = " ";
repaint();
}//same for all 10 buttons but change variables
}
回答by MadProgrammer
Why not use the tool tip API that already exists?
为什么不使用已经存在的工具提示 API？
button.setTooltip("Manchester");
You even use HTML text to produce formatted results.
您甚至可以使用 HTML 文本来生成格式化结果。
button.setTooltip("<html>Manchester<br>53.4800° N, 2.2400° W</html>");
If the images are embedded, you can even supply an image...
如果嵌入了图像，您甚至可以提供图像...
button.setTooltip("<html><img src=" + getClass().getResource("/someimage") + "/>Manchester<br>53.4800° N, 2.2400° W</html>");
回答by mKorbel
don't to use
MouseListenerorMosueMotionListenerfromJButton, this method are correctly implemented inJButtons API,there no reason, I can't found reason to use
repaint()for this jobanother way is add
ChangeListenertoJButtonand take rellated event(s) from derivedButtonModelfor better help sooner post an SSCCE, short, runnable, compilable, just about
JFramewith oneJButton
不要使用
MouseListener或MosueMotionListener来自JButton，此方法在JButtons API，没有理由，我找不到
repaint()适合这份工作的理由另一种方式是添加
ChangeListener到JButton并采取源自rellated事件（一个或多个）ButtonModel尽快发布SSCCE以获得更好的帮助，简短，可运行，可编译，只需
JFrame一个JButton
回答by T Beatz
Well this answer is coolio for JDK 8 users, so try it out:
那么这个答案对于 JDK 8 用户来说是很酷的，所以试试看：
for regular text
对于常规文本
buttonyoumade.setToolTipText("Text you choose");
for html use
为 html 使用
anotherbuttonyoumade.setToolTipText("<html> any valid html code </html>");
