Swing Hacks

Animate Transitions Between Tabs #8

Chapter 1, Basic JComponents

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37

HACK

Another Example

Because TransitionTabbedPane makes it so easy to build new animations, I

thought I’d add another one. This is the old venetian blinds effect, where

vertical bars cover the old screen and uncover the new one; Example 1-19

puts it together.

JTabbedPane tab = new InOutPane( );

tab.addTab("t1",new JButton("Test Button 1"));

tab.addTab("t2",new JButton("Test Button 2"));

frame.getContentPane( ).add(tab);

frame.pack( );

frame.show( );

}

}

Figure 1-23. Two tabs, before transition effect begins

Figure 1-24. Tab transition at mid-point

Example 1-18. Testing out tabbed animation transitions (continued)

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Chapter 1, Basic JComponents

#8 Animate Transitions Between Tabs

HACK

Just like InOutPane, VenetianPane selectively draws the old tab and then cal-

culates the placement of animated rectangles. In this case, there is a blind

rectangle that spans the entire screen from top to bottom, but has the width

of the current step. As a result of the step growing, this rectangle gets bigger

Example 1-19. Creating a venetian blinds effect

public class VenetianPane extends TransitionTabbedPane {

public void paintTransition(Graphics2D g2, int step,

Rectangle size, Image prev) {

int length = getAnimationLength( );

int half = length/2; ...