Graphics, AWT, Swing II part

MouseEvent e;

if ((e.getModifiers() & e.BUTTON1_MASK) != 0)

{ // code for left button click }

and just so you know,

InputEvent.BUTTON2_MASK is the middle or scroller button

InputEvent.BUTTON3_MASK is the right button in windows

by MSW

 Q: How do I count the width in pixels of the text before drawing them into

graphics?

I have the Font and the String and I am using them in an applet:

graphics.setFont(font);

graphics.drawString(str);

How do I count the width in pixels of the text before drawing them into graphics?

Answer: import java.awt.*;

Toolkit tk = java.awt.Toolkit.getDefaultToolkit();

FontMetrics fm = tk.getFontMetrics(new Font("Arial", Font.PLAIN, 10));

int width = fm.stringWidth("Your String");

Jarkko

 Q: If I do (CustomFrame extends Frame) smth. like this:

Frame newFrame = new CustomFrame();

what are the advantages of doing this over:

CustomFrame newFrame = new CustomFrame();

Answer:

There is one difference.

If the reference is a Frame type you can always downcast it, but not if it

is a CustomFrame type.

Might be nice sometimes.

Soren   Disky   Reinke 

 Q: I want to know what is the difference between JScrollPane and JScrollBar...is

both same or not..?

Answer: No. A JScrollPane is a container for components which can grow larger than

the visible area that can be displayed (i.e., a JTable or a JTree, for example). When

you place a component like these into a JScrollPane then the visible area is

displayed and appropriate scrollbars presented to allow scrolling to non visible

areas.

file:///F|/a_jsite/350_tips/graphics II.htm (2 of 5) [2001 07 08 11:24:55]