Core Swing Components - The Definitive Guide to Java Swing - page 82

Figure 4-4. Tooltip text displayed with custom colors

After the JToolTip has been created, you can configure the inherited JComponent properties
or any of the properties specific to JToolTip , as shown in Table 4-5.

Table 4-5. JToolTip Properties
Property Name

Data Type Access

accessibleContext AccessibleContext

Read-only

component JComponent Read-write

tipText String

Read-write

UI ToolTipUI

Read-only

UIClassID String

Read-only

Displaying Positional Tooltip Text
Swing components can even support the display of different tooltip text, depending on where
the mouse pointer is located. This requires overriding the public boolean contains(int x, int y)
method, which originates from the Component class.
For instance, after enhancing the customized JButton created in the previous section
(Figure 4-4), the tooltip text will differ, depending on whether or not the mouse pointer is
within 50 pixels from the left edge of the component.

JButton button = new JButton("Hello, World") {
public JToolTip createToolTip() {
JToolTip tip = super.createToolTip();
tip.setBackground(Color.YELLOW);
tip.setForeground(Color.RED);
return tip;
}
public boolean contains(int x, int y) {
if (x < 50) {
setToolTipText("Got Green Eggs?");
} else {
setToolTipText("Got Ham?");
}
return super.contains(x, y);
}
};