basiclabelui.java

JAVA 所有包

            int y1 = Math.min(iconR.y, textR.y);
            int y2 = Math.max(iconR.y + iconR.height, textR.y + textR.height);
            Dimension rv = new Dimension(x2 - x1, y2 - y1);

            rv.width += dx;
            rv.height += dy;
            return rv;
        }
    }


    /**
     * @return getPreferredSize(c)
     */
    public Dimension getMinimumSize(JComponent c) {
        Dimension d = getPreferredSize(c);
	View v = (View) c.getClientProperty(BasicHTML.propertyKey);
	if (v != null) {
	    d.width -= v.getPreferredSpan(View.X_AXIS) - v.getMinimumSpan(View.X_AXIS);
	}
	return d;
    }

    /**
     * @return getPreferredSize(c)
     */
    public Dimension getMaximumSize(JComponent c) {
        Dimension d = getPreferredSize(c);
	View v = (View) c.getClientProperty(BasicHTML.propertyKey);
	if (v != null) {
	    d.width += v.getMaximumSpan(View.X_AXIS) - v.getPreferredSpan(View.X_AXIS);
	}
	return d;
    }

    /**
     * Returns the baseline.
     *
     * @throws NullPointerException {@inheritDoc}
     * @throws IllegalArgumentException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public int getBaseline(JComponent c, int width, int height) {
        super.getBaseline(c, width, height);
        JLabel label = (JLabel)c;
        String text = label.getText();
        if (text == null || "".equals(text) || label.getFont() == null) {
            return -1;
        }
        FontMetrics fm = label.getFontMetrics(label.getFont());
        layout(label, fm, width, height);
        return BasicHTML.getBaseline(label, paintTextR.y, fm.getAscent(),
                                     paintTextR.width, paintTextR.height);
    }

    /**
     * Returns an enum indicating how the baseline of the component
     * changes as the size changes.
     *
     * @throws NullPointerException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public Component.BaselineResizeBehavior getBaselineResizeBehavior(
            JComponent c) {
        super.getBaselineResizeBehavior(c);
        if (c.getClientProperty(BasicHTML.propertyKey) != null) {
            return Component.BaselineResizeBehavior.OTHER;
        }
        switch(((JLabel)c).getVerticalAlignment()) {
        case JLabel.TOP:
            return Component.BaselineResizeBehavior.CONSTANT_ASCENT;
        case JLabel.BOTTOM:
            return Component.BaselineResizeBehavior.CONSTANT_DESCENT;
        case JLabel.CENTER:
            return Component.BaselineResizeBehavior.CENTER_OFFSET;
        }
        return Component.BaselineResizeBehavior.OTHER;
    }


    public void installUI(JComponent c) { 
        installDefaults((JLabel)c);
        installComponents((JLabel)c);
        installListeners((JLabel)c);
        installKeyboardActions((JLabel)c);
    }

    
    public void uninstallUI(JComponent c) { 
        uninstallDefaults((JLabel)c);
        uninstallComponents((JLabel)c);
        uninstallListeners((JLabel)c);
        uninstallKeyboardActions((JLabel)c);
    }

     protected void installDefaults(JLabel c){
         LookAndFeel.installColorsAndFont(c, "Label.background", "Label.foreground", "Label.font");
         LookAndFeel.installProperty(c, "opaque", Boolean.FALSE);
      }

    protected void installListeners(JLabel c){
        c.addPropertyChangeListener(this);      
    }

    protected void installComponents(JLabel c){
	BasicHTML.updateRenderer(c, c.getText());
        c.setInheritsPopupMenu(true);
    }

    protected void installKeyboardActions(JLabel l) {
        int dka = l.getDisplayedMnemonic();
        Component lf = l.getLabelFor();
        if ((dka != 0) && (lf != null)) {
            LazyActionMap.installLazyActionMap(l, BasicLabelUI.class,
                                               "Label.actionMap");
	    InputMap inputMap = SwingUtilities.getUIInputMap
		            (l, JComponent.WHEN_IN_FOCUSED_WINDOW);
	    if (inputMap == null) {
		inputMap = new ComponentInputMapUIResource(l);
		SwingUtilities.replaceUIInputMap(l,
				JComponent.WHEN_IN_FOCUSED_WINDOW, inputMap);
	    }
	    inputMap.clear();
	    inputMap.put(KeyStroke.getKeyStroke(dka, ActionEvent.ALT_MASK,
					      false), "press");
        }
	else {
	    InputMap inputMap = SwingUtilities.getUIInputMap
		            (l, JComponent.WHEN_IN_FOCUSED_WINDOW);
	    if (inputMap != null) {
		inputMap.clear();
	    }
	}
    }

    protected void uninstallDefaults(JLabel c){
    }

    protected void uninstallListeners(JLabel c){
        c.removePropertyChangeListener(this);
    }

    protected void uninstallComponents(JLabel c){
	BasicHTML.updateRenderer(c, "");
    }

    protected void uninstallKeyboardActions(JLabel c) {
	SwingUtilities.replaceUIInputMap(c, JComponent.WHEN_FOCUSED, null);
	SwingUtilities.replaceUIInputMap(c, JComponent.WHEN_IN_FOCUSED_WINDOW,
				       null);
	SwingUtilities.replaceUIActionMap(c, null);
    }

    public static ComponentUI createUI(JComponent c) {
        if (System.getSecurityManager() != null) {
            return SAFE_BASIC_LABEL_UI;
        } else {
            return labelUI;
        }
    }

    public void propertyChange(PropertyChangeEvent e) {
	String name = e.getPropertyName();
	if (name == "text" || "font" == name || "foreground" == name) {
	    // remove the old html view client property if one
	    // existed, and install a new one if the text installed
	    // into the JLabel is html source.
	    JLabel lbl = ((JLabel) e.getSource());
	    String text = lbl.getText();
	    BasicHTML.updateRenderer(lbl, text);
	}
        else if (name == "labelFor" || name == "displayedMnemonic") {
            installKeyboardActions((JLabel) e.getSource());
        }
    }

    // When the accelerator is pressed, temporarily make the JLabel 
    // focusTraversable by registering a WHEN_FOCUSED action for the
    // release of the accelerator.  Then give it focus so it can 
    // prevent unwanted keyTyped events from getting to other components.
    private static class Actions extends UIAction {
        private static final String PRESS = "press";
        private static final String RELEASE = "release";

        Actions(String key) {
            super(key);
        }

        public void actionPerformed(ActionEvent e) {
            JLabel label = (JLabel)e.getSource();
            String key = getName();
            if (key == PRESS) {
                doPress(label);
            }
            else if (key == RELEASE) {
                doRelease(label);
            }
        }

        private void doPress(JLabel label) {
            Component labelFor = label.getLabelFor();
            if (labelFor != null && labelFor.isEnabled()) {
                InputMap inputMap = SwingUtilities.getUIInputMap(label, JComponent.WHEN_FOCUSED);
                if (inputMap == null) {
                    inputMap = new InputMapUIResource();
                    SwingUtilities.replaceUIInputMap(label, JComponent.WHEN_FOCUSED, inputMap);
                }
                int dka = label.getDisplayedMnemonic();
                inputMap.put(KeyStroke.getKeyStroke(dka, ActionEvent.ALT_MASK, true), RELEASE);
                // Need this if ALT is released before the accelerator
                inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_ALT, 0, true), RELEASE);
                label.requestFocus();
            }
        }

        private void doRelease(JLabel label) {
            Component labelFor = label.getLabelFor();
            if (labelFor != null && labelFor.isEnabled()) {
                InputMap inputMap = SwingUtilities.getUIInputMap(label, JComponent.WHEN_FOCUSED);
                if (inputMap != null) {
                    // inputMap should never be null.
                    inputMap.remove(KeyStroke.getKeyStroke(label.getDisplayedMnemonic(), ActionEvent.ALT_MASK, true));
                    inputMap.remove(KeyStroke.getKeyStroke(KeyEvent.VK_ALT, 0, true));
                }
                if (labelFor instanceof Container &&
                        ((Container) labelFor).isFocusCycleRoot()) {
                    labelFor.requestFocus();
                } else {
                    SwingUtilities2.compositeRequestFocus(labelFor);
                }
            }
        }
    }
}