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package javax.swing.plaf.synth;


import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import java.util.*;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.*;



Provides the Synth L&F UI delegate for JSplitPane. 
Author:Scott Violet
Since:1.7
/**
 * Provides the Synth L&F UI delegate for
 * {@link javax.swing.JSplitPane}.
 *
 * @author Scott Violet
 * @since 1.7
 */
public class SynthSplitPaneUI extends BasicSplitPaneUI
                              implements PropertyChangeListener, SynthUI {
    
Keys to use for forward focus traversal when the JComponent is
managing focus.

/**
     * Keys to use for forward focus traversal when the JComponent is
     * managing focus.
     */
    private Set<KeyStroke> managingFocusForwardTraversalKeys;

    
Keys to use for backward focus traversal when the JComponent is
managing focus.

/**
     * Keys to use for backward focus traversal when the JComponent is
     * managing focus.
     */
    private Set<KeyStroke> managingFocusBackwardTraversalKeys;

    
Style for the JSplitPane.

/**
     * Style for the JSplitPane.
     */
    private SynthStyle style;
    
Style for the divider.

/**
     * Style for the divider.
     */
    private SynthStyle dividerStyle;

    
Constructs a SynthSplitPaneUI. 
/**
     *
     * Constructs a {@code SynthSplitPaneUI}.
     */
    public SynthSplitPaneUI() {}

    
Creates a new SynthSplitPaneUI instance

Params:
  • x – component to create UI object for
Returns:the UI object
/**
     * Creates a new SynthSplitPaneUI instance
     *
     * @param x component to create UI object for
     * @return the UI object
     */
    public static ComponentUI createUI(JComponent x) {
        return new SynthSplitPaneUI();
    }

    
Installs the UI defaults.

/**
     * Installs the UI defaults.
     */
    @Override
    @SuppressWarnings("deprecation")
    protected void installDefaults() {
        updateStyle(splitPane);

        setOrientation(splitPane.getOrientation());
        setContinuousLayout(splitPane.isContinuousLayout());

        resetLayoutManager();

        /* Install the nonContinuousLayoutDivider here to avoid having to
        add/remove everything later. */
        if(nonContinuousLayoutDivider == null) {
            setNonContinuousLayoutDivider(
                                createDefaultNonContinuousLayoutDivider(),
                                true);
        } else {
            setNonContinuousLayoutDivider(nonContinuousLayoutDivider, true);
        }

        // focus forward traversal key
        if (managingFocusForwardTraversalKeys==null) {
            managingFocusForwardTraversalKeys = new HashSet<KeyStroke>();
            managingFocusForwardTraversalKeys.add(
                KeyStroke.getKeyStroke(KeyEvent.VK_TAB, 0));
        }
        splitPane.setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
                                        managingFocusForwardTraversalKeys);
        // focus backward traversal key
        if (managingFocusBackwardTraversalKeys==null) {
            managingFocusBackwardTraversalKeys = new HashSet<KeyStroke>();
            managingFocusBackwardTraversalKeys.add(
                KeyStroke.getKeyStroke(KeyEvent.VK_TAB, InputEvent.SHIFT_MASK));
        }
        splitPane.setFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS,
                                        managingFocusBackwardTraversalKeys);
    }

    private void updateStyle(JSplitPane splitPane) {
        SynthContext context = getContext(splitPane, Region.SPLIT_PANE_DIVIDER,
                                          ENABLED);
        SynthStyle oldDividerStyle = dividerStyle;
        dividerStyle = SynthLookAndFeel.updateStyle(context, this);

        context = getContext(splitPane, ENABLED);
        SynthStyle oldStyle = style;

        style = SynthLookAndFeel.updateStyle(context, this);

        if (style != oldStyle) {
            Object value = style.get(context, "SplitPane.size");
            if (value == null) {
                value = Integer.valueOf(6);
            }
            LookAndFeel.installProperty(splitPane, "dividerSize", value);
            dividerSize = ((Number)value).intValue();

            value = style.get(context, "SplitPane.oneTouchExpandable");
            if (value != null) {
                LookAndFeel.installProperty(splitPane, "oneTouchExpandable", value);
            }

            if (divider != null) {
                splitPane.remove(divider);
                divider.setDividerSize(splitPane.getDividerSize());
            }
            if (oldStyle != null) {
                uninstallKeyboardActions();
                installKeyboardActions();
            }
        }
        if (style != oldStyle || dividerStyle != oldDividerStyle) {
            // Only way to force BasicSplitPaneDivider to reread the
            // necessary properties.
            if (divider != null) {
                splitPane.remove(divider);
            }
            divider = createDefaultDivider();
            divider.setBasicSplitPaneUI(this);
            splitPane.add(divider, JSplitPane.DIVIDER);
        }
    }

    
Installs the event listeners for the UI.

/**
     * Installs the event listeners for the UI.
     */
    @Override
    protected void installListeners() {
        super.installListeners();
        splitPane.addPropertyChangeListener(this);
    }

    
Uninstalls the UI defaults.

/**
     * Uninstalls the UI defaults.
     */
    @Override
    protected void uninstallDefaults() {
        SynthContext context = getContext(splitPane, ENABLED);

        style.uninstallDefaults(context);
        style = null;

        context = getContext(splitPane, Region.SPLIT_PANE_DIVIDER, ENABLED);
        dividerStyle.uninstallDefaults(context);
        dividerStyle = null;

        super.uninstallDefaults();
    }


    
Uninstalls the event listeners from the UI.

/**
     * Uninstalls the event listeners from the UI.
     */
    @Override
    protected void uninstallListeners() {
        super.uninstallListeners();
        splitPane.removePropertyChangeListener(this);
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    public SynthContext getContext(JComponent c) {
        return getContext(c, SynthLookAndFeel.getComponentState(c));
    }

    private SynthContext getContext(JComponent c, int state) {
        return SynthContext.getContext(c, style, state);
    }

    SynthContext getContext(JComponent c, Region region) {
        return getContext(c, region, getComponentState(c, region));
    }

    private SynthContext getContext(JComponent c, Region region, int state) {
        if (region == Region.SPLIT_PANE_DIVIDER) {
            return SynthContext.getContext(c, region, dividerStyle, state);
        }
        return SynthContext.getContext(c, region, style, state);
    }

    private int getComponentState(JComponent c, Region subregion) {
        int state = SynthLookAndFeel.getComponentState(c);

        if (divider.isMouseOver()) {
            state |= MOUSE_OVER;
        }
        return state;
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    public void propertyChange(PropertyChangeEvent e) {
        if (SynthLookAndFeel.shouldUpdateStyle(e)) {
            updateStyle((JSplitPane)e.getSource());
        }
    }

    
Creates the default divider.

/**
     * Creates the default divider.
     */
    @Override
    public BasicSplitPaneDivider createDefaultDivider() {
        SynthSplitPaneDivider divider = new SynthSplitPaneDivider(this);

        divider.setDividerSize(splitPane.getDividerSize());
        return divider;
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    @SuppressWarnings("serial") // anonymous class
    protected Component createDefaultNonContinuousLayoutDivider() {
        return new Canvas() {
            public void paint(Graphics g) {
                paintDragDivider(g, 0, 0, getWidth(), getHeight());
            }
        };
    }

    
Notifies this UI delegate to repaint the specified component. This method paints the component background, then calls the paint(SynthContext, Graphics) method. 
In general, this method does not need to be overridden by subclasses. All Look and Feel rendering code should reside in the paint method. 
Params:
  • g – the Graphics object used for painting
  • c – the component being painted
See Also:
/**
     * Notifies this UI delegate to repaint the specified component.
     * This method paints the component background, then calls
     * the {@link #paint(SynthContext,Graphics)} method.
     *
     * <p>In general, this method does not need to be overridden by subclasses.
     * All Look and Feel rendering code should reside in the {@code paint} method.
     *
     * @param g the {@code Graphics} object used for painting
     * @param c the component being painted
     * @see #paint(SynthContext,Graphics)
     */
    @Override
    public void update(Graphics g, JComponent c) {
        SynthContext context = getContext(c);

        SynthLookAndFeel.update(context, g);
        context.getPainter().paintSplitPaneBackground(context,
                          g, 0, 0, c.getWidth(), c.getHeight());
        paint(context, g);
    }

    
Paints the specified component according to the Look and Feel.

This method is not used by Synth Look and Feel. Painting is handled by the paint(SynthContext, Graphics) method. 
Params:
  • g – the Graphics object used for painting
  • c – the component being painted
See Also:
/**
     * Paints the specified component according to the Look and Feel.
     * <p>This method is not used by Synth Look and Feel.
     * Painting is handled by the {@link #paint(SynthContext,Graphics)} method.
     *
     * @param g the {@code Graphics} object used for painting
     * @param c the component being painted
     * @see #paint(SynthContext,Graphics)
     */
    @Override
    public void paint(Graphics g, JComponent c) {
        SynthContext context = getContext(c);

        paint(context, g);
    }

    
Paints the specified component. This implementation does nothing.

Params:
  • context – context for the component being painted
  • g – the Graphics object used for painting
See Also:
/**
     * Paints the specified component. This implementation does nothing.
     *
     * @param context context for the component being painted
     * @param g the {@code Graphics} object used for painting
     * @see #update(Graphics,JComponent)
     */
    protected void paint(SynthContext context, Graphics g) {
        // This is done to update package private variables in
        // BasicSplitPaneUI
        super.paint(g, splitPane);
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    public void paintBorder(SynthContext context, Graphics g, int x,
                            int y, int w, int h) {
        context.getPainter().paintSplitPaneBorder(context, g, x, y, w, h);
    }

    private void paintDragDivider(Graphics g, int x, int y, int w, int h) {
        SynthContext context = getContext(splitPane,Region.SPLIT_PANE_DIVIDER);
        context.setComponentState(((context.getComponentState() | MOUSE_OVER) ^
                                   MOUSE_OVER) | PRESSED);
        Shape oldClip = g.getClip();
        g.clipRect(x, y, w, h);
        context.getPainter().paintSplitPaneDragDivider(context, g, x, y, w, h,
                                           splitPane.getOrientation());
        g.setClip(oldClip);
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    public void finishedPaintingChildren(JSplitPane jc, Graphics g) {
        if(jc == splitPane && getLastDragLocation() != -1 &&
                              !isContinuousLayout() && !draggingHW) {
            if(jc.getOrientation() == JSplitPane.HORIZONTAL_SPLIT) {
                paintDragDivider(g, getLastDragLocation(), 0, dividerSize - 1,
                                 splitPane.getHeight() - 1);
            } else {
                paintDragDivider(g, 0, getLastDragLocation(),
                                 splitPane.getWidth() - 1, dividerSize - 1);
            }
        }
    }
}