jbutton | Tech Tips & Tricks

How To Enable/Disable Buttons Of JSplitPane

March 2, 2013 by blogmeister·0 Comments

I thought that calling setEnabled() on a JSplitPane object will also enable/disable the divider buttons. I found out it does not. Only the divider gets disabled so when you click on the buttons, the JSplitPane will still be resized.

To get a reference on the buttons, you make use of the BasicSplitPaneUI class, cast it and call setEnabled() on them.

Check the code below.

BasicSplitPaneUI ui = (BasicSplitPaneUI) mySplitPane.getUI();
((JButton) ui.getDivider().getComponent(0)).setEnabled(false);
((JButton) ui.getDivider().getComponent(1)).setEnabled(false);

BasicSplitPaneUI ui = (BasicSplitPaneUI) mySplitPane.getUI();

((JButton) ui.getDivider().getComponent(0)).setEnabled(false);

((JButton) ui.getDivider().getComponent(1)).setEnabled(false);

That should let you enable or disable the buttons of the JSplitPane divider.

Create A Logout Button Beside A JTabbedPane

December 13, 2009 by blogmeister·1 Comment

Creating a logout button beside a set of tabbed panes in a JTabbedPane like the image pictured above can only be done by adding another tabbed pane and overriding the pane’s UI methods to remove the borders of the last tabbed pane while setting the location of the logout button to the far right.

If you do not override the UI methods of the JTabbedPane, the tabbed pane’s borders will always be visible plus the logout button will always be positioned next to the other tabbed panes instead of to the far right.

private void addLogoutButtonToTabbedPane(JTabbedPane tabbedPane1) {
    final int SPACER = 20;
    // resize the button's dimension so that the original tabbed pane's tab's size is intact
    final JButton button = new JButton("Logout");
    button.setPreferredSize(new Dimension(80, 20));
    button.addActionListener((ActionListener) new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent ae) {
            // logout code here
        }
    });
    tabbedPanel.setRequestFocusEnabled(false);
    tabbedPanel.addTab(null, null);
    tabbedPanel.setEnabledAt(tabbedPanel.getTabCount() - 1, false);
    tabbedPanel.setTabComponentAt(tabbedPanel.getTabCount() - 1, button);
    tabbedPanel.setUI(new MetalTabbedPaneUI() {
        @Override
        protected void paintTabBackground(Graphics g, int tabPlacement, int tabIndex, int x, int y, int w, int h, boolean isSelected) {
            if (tabIndex == tabbedPanel.getTabCount() - 1) {
                //g.setColor(super.tabAreaBackground);
            } else {
                super.paintTabBackground(g, tabPlacement, tabIndex, x, y, w, h, isSelected);
            }
        }
        @Override
        protected void paintTabBorder(Graphics g, int tabPlacement, int tabIndex, int x, int y, int w, int h, boolean isSelected) {
            if (tabIndex == tabbedPanel.getTabCount() - 1) {
                // the left border of the last tab should be placed in the position
                // of the right border of the tab previous to it because it is blank
                int newx = tabbedPanel.getBoundsAt(tabbedPanel.getTabCount() - 2).x +
                        tabbedPanel.getBoundsAt(tabbedPanel.getTabCount() - 2).width;
                g.drawRect(newx, y, 0, h);
            } else {
                super.paintTabBorder(g, tabPlacement, tabIndex, x, y, w, h, isSelected);
            }
        }
        @Override
        protected void paintFocusIndicator(Graphics g, int tabPlacement, Rectangle[] rects, int tabIndex, Rectangle iconRect, Rectangle textRect, boolean isSelected) {
            // override so that no indicator will be shown in the logout tabbed button
        }
        @Override
        protected void paintTab(Graphics g, int tabPlacement, Rectangle[] rects, int tabIndex, Rectangle iconRect, Rectangle textRect) {                // add -20 to add space from the right
            rects[rects.length - 1].x = tabbedPanel.getSize().width - button.getSize().width - SPACER;
            button.setLocation(rects[rects.length - 1].x, rects[rects.length - 1].y);
            super.paintTab(g, tabPlacement, rects, tabIndex, iconRect, textRect);
        }
    });
}

private void addLogoutButtonToTabbedPane(JTabbedPane tabbedPane1) {

final int SPACER = 20;

// resize the button's dimension so that the original tabbed pane's tab's size is intact

final JButton button = new JButton("Logout");

button.setPreferredSize(new Dimension(80, 20));

button.addActionListener((ActionListener) new ActionListener() {

@Override

public void actionPerformed(ActionEvent ae) {

// logout code here

}

});

tabbedPanel.setRequestFocusEnabled(false);

tabbedPanel.addTab(null, null);

tabbedPanel.setEnabledAt(tabbedPanel.getTabCount() - 1, false);

tabbedPanel.setTabComponentAt(tabbedPanel.getTabCount() - 1, button);

tabbedPanel.setUI(new MetalTabbedPaneUI() {

@Override

protected void paintTabBackground(Graphics g, int tabPlacement, int tabIndex, int x, int y, int w, int h, boolean isSelected) {

if (tabIndex == tabbedPanel.getTabCount() - 1) {

//g.setColor(super.tabAreaBackground);

} else {

super.paintTabBackground(g, tabPlacement, tabIndex, x, y, w, h, isSelected);

}

@Override

protected void paintTabBorder(Graphics g, int tabPlacement, int tabIndex, int x, int y, int w, int h, boolean isSelected) {

if (tabIndex == tabbedPanel.getTabCount() - 1) {

// the left border of the last tab should be placed in the position

// of the right border of the tab previous to it because it is blank

int newx = tabbedPanel.getBoundsAt(tabbedPanel.getTabCount() - 2).x +

tabbedPanel.getBoundsAt(tabbedPanel.getTabCount() - 2).width;

g.drawRect(newx, y, 0, h);

} else {

super.paintTabBorder(g, tabPlacement, tabIndex, x, y, w, h, isSelected);

}

@Override

protected void paintFocusIndicator(Graphics g, int tabPlacement, Rectangle[] rects, int tabIndex, Rectangle iconRect, Rectangle textRect, boolean isSelected) {

// override so that no indicator will be shown in the logout tabbed button

}

@Override

protected void paintTab(Graphics g, int tabPlacement, Rectangle[] rects, int tabIndex, Rectangle iconRect, Rectangle textRect) { // add -20 to add space from the right

rects[rects.length - 1].x = tabbedPanel.getSize().width - button.getSize().width - SPACER;

button.setLocation(rects[rects.length - 1].x, rects[rects.length - 1].y);

super.paintTab(g, tabPlacement, rects, tabIndex, iconRect, textRect);

}

});

}

Rotate JButton To Vertical

November 15, 2009 by blogmeister·16 Comments

I had a previous post regarding rotating a JLabel and that involved creating a class that extends the BasicLabelUI class to do the rotation. JButton also has a class of its own called BasicButtonUI that you need to inherit in order to do rotation vertically.

To set the JButton to a certain angle, just set the parameter as either 90 or 270 in the VerticalButtonUI class. Kudos to the developer who created this class (I don’t know who).

jButton2.setUI(new VerticalButtonUI(90));

1	jButton2.setUI(new VerticalButtonUI(90));

Here is the code for the VerticalButtonUI class.

public class VerticalButtonUI extends BasicButtonUI {
    protected int angle;
    public VerticalButtonUI(int angle) {
        super();
        this.angle = angle;
    }
    @Override
    public Dimension getPreferredSize(JComponent c) {
        Dimension dim = super.getPreferredSize(c);
        return new Dimension( dim.height, dim.width );
    }
    private static Rectangle paintIconR = new Rectangle();
    private static Rectangle paintTextR = new Rectangle();
    private static Rectangle paintViewR = new Rectangle();
    private static Insets paintViewInsets = new Insets(0, 0, 0, 0);
    @Override
    public void paint(Graphics g, JComponent c) {
        JButton button = (JButton)c;
        String text = button.getText();
        Icon icon = (button.isEnabled()) ? button.getIcon() : button.getDisabledIcon();
        if ((icon == null) && (text == null)) {
            return;
        }
        FontMetrics fm = g.getFontMetrics();
        paintViewInsets = c.getInsets(paintViewInsets);
        paintViewR.x = paintViewInsets.left;
        paintViewR.y = paintViewInsets.top;
        // Use inverted height & width
        paintViewR.height = c.getWidth() - (paintViewInsets.left + paintViewInsets.right);
        paintViewR.width = c.getHeight() - (paintViewInsets.top + paintViewInsets.bottom);
        paintIconR.x = paintIconR.y = paintIconR.width = paintIconR.height = 0;
        paintTextR.x = paintTextR.y = paintTextR.width = paintTextR.height = 0;
        Graphics2D g2 = (Graphics2D) g;
        AffineTransform tr = g2.getTransform();
        if (angle == 90) {
            g2.rotate( Math.PI / 2 );
            g2.translate( 0, - c.getWidth() );
            paintViewR.x = c.getHeight()/2 - (int)fm.getStringBounds(text, g).getWidth()/2;
            paintViewR.y = c.getWidth()/2 - (int)fm.getStringBounds(text, g).getHeight()/2;
        }
        else if (angle == 270) {
            g2.rotate( - Math.PI / 2 );
            g2.translate( - c.getHeight(), 0 );
            paintViewR.x = c.getHeight()/2 - (int)fm.getStringBounds(text, g).getWidth()/2;
            paintViewR.y = c.getWidth()/2 - (int)fm.getStringBounds(text, g).getHeight()/2;
        }
        if (icon != null) {
            icon.paintIcon(c, g, paintIconR.x, paintIconR.y);
        }
        if (text != null) {
            int textX = paintTextR.x;
            int textY = paintTextR.y + fm.getAscent();
            if (button.isEnabled()) {
                paintText(g,c,new Rectangle(paintViewR.x,paintViewR.y,textX,textY),text);
            } else {
                paintText(g,c,new Rectangle(paintViewR.x,paintViewR.y,textX,textY),text);
            }
        }
        g2.setTransform( tr );
    }
}

public class VerticalButtonUI extends BasicButtonUI {

protected int angle;

public VerticalButtonUI(int angle) {

super();

this.angle = angle;

}

@Override

public Dimension getPreferredSize(JComponent c) {

Dimension dim = super.getPreferredSize(c);

return new Dimension( dim.height, dim.width );

}

private static Rectangle paintIconR = new Rectangle();

private static Rectangle paintTextR = new Rectangle();

private static Rectangle paintViewR = new Rectangle();

private static Insets paintViewInsets = new Insets(0, 0, 0, 0);

@Override

public void paint(Graphics g, JComponent c) {

JButton button = (JButton)c;

String text = button.getText();

Icon icon = (button.isEnabled()) ? button.getIcon() : button.getDisabledIcon();

if ((icon == null) && (text == null)) {

return;

}

FontMetrics fm = g.getFontMetrics();

paintViewInsets = c.getInsets(paintViewInsets);

paintViewR.x = paintViewInsets.left;

paintViewR.y = paintViewInsets.top;

// Use inverted height & width

paintViewR.height = c.getWidth() - (paintViewInsets.left + paintViewInsets.right);

paintViewR.width = c.getHeight() - (paintViewInsets.top + paintViewInsets.bottom);

paintIconR.x = paintIconR.y = paintIconR.width = paintIconR.height = 0;

paintTextR.x = paintTextR.y = paintTextR.width = paintTextR.height = 0;

Graphics2D g2 = (Graphics2D) g;

AffineTransform tr = g2.getTransform();

if (angle == 90) {

g2.rotate( Math.PI / 2 );

g2.translate( 0, - c.getWidth() );

paintViewR.x = c.getHeight()/2 - (int)fm.getStringBounds(text, g).getWidth()/2;

paintViewR.y = c.getWidth()/2 - (int)fm.getStringBounds(text, g).getHeight()/2;

}

else if (angle == 270) {

g2.rotate( - Math.PI / 2 );

g2.translate( - c.getHeight(), 0 );

paintViewR.x = c.getHeight()/2 - (int)fm.getStringBounds(text, g).getWidth()/2;

paintViewR.y = c.getWidth()/2 - (int)fm.getStringBounds(text, g).getHeight()/2;

}

if (icon != null) {

icon.paintIcon(c, g, paintIconR.x, paintIconR.y);

}

if (text != null) {

int textX = paintTextR.x;

int textY = paintTextR.y + fm.getAscent();

if (button.isEnabled()) {

paintText(g,c,new Rectangle(paintViewR.x,paintViewR.y,textX,textY),text);

} else {

paintText(g,c,new Rectangle(paintViewR.x,paintViewR.y,textX,textY),text);

}

g2.setTransform( tr );

}

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Tag: jbutton

How To Enable/Disable Buttons Of JSplitPane

Create A Logout Button Beside A JTabbedPane

Rotate JButton To Vertical