DefaultTreeCellRenderer is not opaque and
* unless you subclass paint you should not change this.
* See How to Use Trees
* in The Java Tutorial
* for examples of customizing node display using this class.
*
*
* Implementation Note:
* This class overrides
* invalidate,
* validate,
* revalidate,
* repaint,
* and
* firePropertyChange
* solely to improve performance.
* If not overridden, these frequently called methods would execute code paths
* that are unnecessary for the default tree cell renderer.
* If you write your own renderer,
* take care to weigh the benefits and
* drawbacks of overriding these methods.
*
*
* Warning:
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeansTM
* has been added to the java.beans package.
* Please see {@link java.beans.XMLEncoder}.
*
* @version 1.51 01/23/04
* @author Rob Davis
* @author Ray Ryan
* @author Scott Violet
*/
public class DefaultTreeCellRenderer extends JLabel implements TreeCellRenderer
{
/** Last tree the renderer was painted in. */
private JTree tree;
/** Is the value currently selected. */
protected boolean selected;
/** True if has focus. */
protected boolean hasFocus;
/** True if draws focus border around icon as well. */
private boolean drawsFocusBorderAroundIcon;
/** If true, a dashed line is drawn as the focus indicator. */
private boolean drawDashedFocusIndicator;
// If drawDashedFocusIndicator is true, the following are used.
/**
* Background color of the tree.
*/
private Color treeBGColor;
/**
* Color to draw the focus indicator in, determined from the background.
* color.
*/
private Color focusBGColor;
// Icons
/** Icon used to show non-leaf nodes that aren't expanded. */
transient protected Icon closedIcon;
/** Icon used to show leaf nodes. */
transient protected Icon leafIcon;
/** Icon used to show non-leaf nodes that are expanded. */
transient protected Icon openIcon;
// Colors
/** Color to use for the foreground for selected nodes. */
protected Color textSelectionColor;
/** Color to use for the foreground for non-selected nodes. */
protected Color textNonSelectionColor;
/** Color to use for the background when a node is selected. */
protected Color backgroundSelectionColor;
/** Color to use for the background when the node isn't selected. */
protected Color backgroundNonSelectionColor;
/** Color to use for the focus indicator when the node has focus. */
protected Color borderSelectionColor;
/**
* Returns a new instance of DefaultTreeCellRenderer. Alignment is
* set to left aligned. Icons and text color are determined from the
* UIManager.
*/
public DefaultTreeCellRenderer() {
setHorizontalAlignment(JLabel.LEFT);
setLeafIcon(UIManager.getIcon("Tree.leafIcon"));
setClosedIcon(UIManager.getIcon("Tree.closedIcon"));
setOpenIcon(UIManager.getIcon("Tree.openIcon"));
setTextSelectionColor(UIManager.getColor("Tree.selectionForeground"));
setTextNonSelectionColor(UIManager.getColor("Tree.textForeground"));
setBackgroundSelectionColor(UIManager.getColor("Tree.selectionBackground"));
setBackgroundNonSelectionColor(UIManager.getColor("Tree.textBackground"));
setBorderSelectionColor(UIManager.getColor("Tree.selectionBorderColor"));
Object value = UIManager.get("Tree.drawsFocusBorderAroundIcon");
drawsFocusBorderAroundIcon = (value != null && ((Boolean)value).
booleanValue());
value = UIManager.get("Tree.drawDashedFocusIndicator");
drawDashedFocusIndicator = (value != null && ((Boolean)value).
booleanValue());
}
/**
* Returns the default icon, for the current laf, that is used to
* represent non-leaf nodes that are expanded.
*/
public Icon getDefaultOpenIcon() {
return UIManager.getIcon("Tree.openIcon");
}
/**
* Returns the default icon, for the current laf, that is used to
* represent non-leaf nodes that are not expanded.
*/
public Icon getDefaultClosedIcon() {
return UIManager.getIcon("Tree.closedIcon");
}
/**
* Returns the default icon, for the current laf, that is used to
* represent leaf nodes.
*/
public Icon getDefaultLeafIcon() {
return UIManager.getIcon("Tree.leafIcon");
}
/**
* Sets the icon used to represent non-leaf nodes that are expanded.
*/
public void setOpenIcon(Icon newIcon) {
openIcon = newIcon;
}
/**
* Returns the icon used to represent non-leaf nodes that are expanded.
*/
public Icon getOpenIcon() {
return openIcon;
}
/**
* Sets the icon used to represent non-leaf nodes that are not expanded.
*/
public void setClosedIcon(Icon newIcon) {
closedIcon = newIcon;
}
/**
* Returns the icon used to represent non-leaf nodes that are not
* expanded.
*/
public Icon getClosedIcon() {
return closedIcon;
}
/**
* Sets the icon used to represent leaf nodes.
*/
public void setLeafIcon(Icon newIcon) {
leafIcon = newIcon;
}
/**
* Returns the icon used to represent leaf nodes.
*/
public Icon getLeafIcon() {
return leafIcon;
}
/**
* Sets the color the text is drawn with when the node is selected.
*/
public void setTextSelectionColor(Color newColor) {
textSelectionColor = newColor;
}
/**
* Returns the color the text is drawn with when the node is selected.
*/
public Color getTextSelectionColor() {
return textSelectionColor;
}
/**
* Sets the color the text is drawn with when the node isn't selected.
*/
public void setTextNonSelectionColor(Color newColor) {
textNonSelectionColor = newColor;
}
/**
* Returns the color the text is drawn with when the node isn't selected.
*/
public Color getTextNonSelectionColor() {
return textNonSelectionColor;
}
/**
* Sets the color to use for the background if node is selected.
*/
public void setBackgroundSelectionColor(Color newColor) {
backgroundSelectionColor = newColor;
}
/**
* Returns the color to use for the background if node is selected.
*/
public Color getBackgroundSelectionColor() {
return backgroundSelectionColor;
}
/**
* Sets the background color to be used for non selected nodes.
*/
public void setBackgroundNonSelectionColor(Color newColor) {
backgroundNonSelectionColor = newColor;
}
/**
* Returns the background color to be used for non selected nodes.
*/
public Color getBackgroundNonSelectionColor() {
return backgroundNonSelectionColor;
}
/**
* Sets the color to use for the border.
*/
public void setBorderSelectionColor(Color newColor) {
borderSelectionColor = newColor;
}
/**
* Returns the color the border is drawn.
*/
public Color getBorderSelectionColor() {
return borderSelectionColor;
}
/**
* Subclassed to map FontUIResources to null. If
* font is null, or a FontUIResource, this
* has the effect of letting the font of the JTree show
* through. On the other hand, if font is non-null, and not
* a FontUIResource, the font becomes font.
*/
public void setFont(Font font) {
if(font instanceof FontUIResource)
font = null;
super.setFont(font);
}
/**
* Gets the font of this component.
* @return this component's font; if a font has not been set
* for this component, the font of its parent is returned
*/
public Font getFont() {
Font font = super.getFont();
if (font == null && tree != null) {
// Strive to return a non-null value, otherwise the html support
// will typically pick up the wrong font in certain situations.
font = tree.getFont();
}
return font;
}
/**
* Subclassed to map ColorUIResources to null. If
* color is null, or a ColorUIResource, this
* has the effect of letting the background color of the JTree show
* through. On the other hand, if color is non-null, and not
* a ColorUIResource, the background becomes
* color.
*/
public void setBackground(Color color) {
if(color instanceof ColorUIResource)
color = null;
super.setBackground(color);
}
/**
* Configures the renderer based on the passed in components.
* The value is set from messaging the tree with
* convertValueToText, which ultimately invokes
* toString on value.
* The foreground color is set based on the selection and the icon
* is set based on on leaf and expanded.
*/
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean sel,
boolean expanded,
boolean leaf, int row,
boolean hasFocus) {
String stringValue = tree.convertValueToText(value, sel,
expanded, leaf, row, hasFocus);
this.tree = tree;
this.hasFocus = hasFocus;
setText(stringValue);
if(sel)
setForeground(getTextSelectionColor());
else
setForeground(getTextNonSelectionColor());
// There needs to be a way to specify disabled icons.
if (!tree.isEnabled()) {
setEnabled(false);
if (leaf) {
setDisabledIcon(getLeafIcon());
} else if (expanded) {
setDisabledIcon(getOpenIcon());
} else {
setDisabledIcon(getClosedIcon());
}
}
else {
setEnabled(true);
if (leaf) {
setIcon(getLeafIcon());
} else if (expanded) {
setIcon(getOpenIcon());
} else {
setIcon(getClosedIcon());
}
}
setComponentOrientation(tree.getComponentOrientation());
selected = sel;
return this;
}
/**
* Paints the value. The background is filled based on selected.
*/
public void paint(Graphics g) {
Color bColor;
if(selected) {
bColor = getBackgroundSelectionColor();
} else {
bColor = getBackgroundNonSelectionColor();
if(bColor == null)
bColor = getBackground();
}
int imageOffset = -1;
if(bColor != null) {
Icon currentI = getIcon();
imageOffset = getLabelStart();
g.setColor(bColor);
if(getComponentOrientation().isLeftToRight()) {
g.fillRect(imageOffset, 0, getWidth() - imageOffset,
getHeight());
} else {
g.fillRect(0, 0, getWidth() - imageOffset,
getHeight());
}
}
if (hasFocus) {
if (drawsFocusBorderAroundIcon) {
imageOffset = 0;
}
else if (imageOffset == -1) {
imageOffset = getLabelStart();
}
if(getComponentOrientation().isLeftToRight()) {
paintFocus(g, imageOffset, 0, getWidth() - imageOffset,
getHeight());
} else {
paintFocus(g, 0, 0, getWidth() - imageOffset, getHeight());
}
}
super.paint(g);
}
private void paintFocus(Graphics g, int x, int y, int w, int h) {
Color bsColor = getBorderSelectionColor();
if (bsColor != null && (selected || !drawDashedFocusIndicator)) {
g.setColor(bsColor);
g.drawRect(x, y, w - 1, h - 1);
}
if (drawDashedFocusIndicator) {
Color color;
if (selected) {
color = getBackgroundSelectionColor();
} else {
color = getBackgroundNonSelectionColor();
if(color == null) {
color = getBackground();
}
}
if (treeBGColor != color) {
treeBGColor = color;
focusBGColor = new Color(~color.getRGB());
}
g.setColor(focusBGColor);
BasicGraphicsUtils.drawDashedRect(g, x, y, w, h);
}
}
private int getLabelStart() {
Icon currentI = getIcon();
if(currentI != null && getText() != null) {
return currentI.getIconWidth() + Math.max(0, getIconTextGap() - 1);
}
return 0;
}
/**
* Overrides JComponent.getPreferredSize to
* return slightly wider preferred size value.
*/
public Dimension getPreferredSize() {
Dimension retDimension = super.getPreferredSize();
if(retDimension != null)
retDimension = new Dimension(retDimension.width + 3,
retDimension.height);
return retDimension;
}
/**
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
*/
public void validate() {}
/**
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
*
* @since 1.5
*/
public void invalidate() {}
/**
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
*/
public void revalidate() {}
/**
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
*/
public void repaint(long tm, int x, int y, int width, int height) {}
/**
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
*/
public void repaint(Rectangle r) {}
/**
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
*
* @since 1.5
*/
public void repaint() {}
/**
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
*/
protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
// Strings get interned...
if (propertyName=="text")
super.firePropertyChange(propertyName, oldValue, newValue);
}
/**
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
*/
public void firePropertyChange(String propertyName, byte oldValue, byte newValue) {}
/**
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
*/
public void firePropertyChange(String propertyName, char oldValue, char newValue) {}
/**
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
*/
public void firePropertyChange(String propertyName, short oldValue, short newValue) {}
/**
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
*/
public void firePropertyChange(String propertyName, int oldValue, int newValue) {}
/**
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
*/
public void firePropertyChange(String propertyName, long oldValue, long newValue) {}
/**
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
*/
public void firePropertyChange(String propertyName, float oldValue, float newValue) {}
/**
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
*/
public void firePropertyChange(String propertyName, double oldValue, double newValue) {}
/**
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
*/
public void firePropertyChange(String propertyName, boolean oldValue, boolean newValue) {}
}