basicspinnerui.java

java jdk 1.4的源码

    private void installKeyboardActions() {
        InputMap iMap = getInputMap(JComponent.
                                   WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);

	SwingUtilities.replaceUIInputMap(spinner, JComponent.
					 WHEN_ANCESTOR_OF_FOCUSED_COMPONENT,
					 iMap);

	SwingUtilities.replaceUIActionMap(spinner, getActionMap());
    }

    /**
     * Returns the InputMap to install for <code>condition</code>.
     */
    private InputMap getInputMap(int condition) {
        if (condition == JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT) {
	    return (InputMap)UIManager.get("Spinner.ancestorInputMap");
        }
        return null;
    }

    private ActionMap getActionMap() {
	ActionMap map = (ActionMap)UIManager.get("Spinner.actionMap");

	if (map == null) {
	    map = createActionMap();
	    if (map != null) {
		UIManager.getLookAndFeelDefaults().put("Spinner.actionMap",
                                                       map);
	    }
	}
        return map;
    }

    private ActionMap createActionMap() {
        ActionMap map = new ActionMapUIResource();

        map.put("increment", nextButtonHandler);
        map.put("decrement", previousButtonHandler);
        return map;
    }

    /**
     * A handler for spinner arrow button mouse and action events.  When 
     * a left mouse pressed event occurs we look up the (enabled) spinner 
     * that's the source of the event and start the autorepeat timer.  The
     * timer fires action events until any button is released at which 
     * point the timer is stopped and the reference to the spinner cleared.
     * The timer doesn't start until after a 300ms delay, so often the 
     * source of the initial (and final) action event is just the button
     * logic for mouse released - which means that we're relying on the fact
     * that our mouse listener runs after the buttons mouse listener.
     * <p>
     * Note that one instance of this handler is shared by all slider previous 
     * arrow buttons and likewise for all of the next buttons, 
     * so it doesn't have any state that persists beyond the limits
     * of a single button pressed/released gesture.
     */
    private static class ArrowButtonHandler extends AbstractAction
					    implements MouseListener, UIResource {
	final javax.swing.Timer autoRepeatTimer;
	final boolean isNext;
	JSpinner spinner = null;

	ArrowButtonHandler(String name, boolean isNext) {
            super(name);
	    this.isNext = isNext;
	    autoRepeatTimer = new javax.swing.Timer(60, this);
	    autoRepeatTimer.setInitialDelay(300);
	}

	private JSpinner eventToSpinner(AWTEvent e) {
	    Object src = e.getSource();
	    while ((src instanceof Component) && !(src instanceof JSpinner)) {
		src = ((Component)src).getParent();
	    }
	    return (src instanceof JSpinner) ? (JSpinner)src : null;
	}

	public void actionPerformed(ActionEvent e) {
            JSpinner spinner = this.spinner;

            if (!(e.getSource() instanceof javax.swing.Timer)) {
                // Most likely resulting from being in ActionMap.
                spinner = eventToSpinner(e);
            }
            if (spinner != null) {
                try {
                    int calendarField = getCalendarField(spinner);
                    spinner.commitEdit();
                    if (calendarField != -1) {
                        ((SpinnerDateModel)spinner.getModel()).
                                 setCalendarField(calendarField);
                    }
                    Object value = (isNext) ? spinner.getNextValue() :
                               spinner.getPreviousValue();
                    if (value != null) {
                        spinner.setValue(value);
                        select(spinner);
                    }
                } catch (IllegalArgumentException iae) {
                    UIManager.getLookAndFeel().provideErrorFeedback(spinner);
                } catch (ParseException pe) {
                    UIManager.getLookAndFeel().provideErrorFeedback(spinner);
                }
            }
	}

        /**
         * If the spinner's editor is a DateEditor, this selects the field
         * associated with the value that is being incremented.
         */
        private void select(JSpinner spinner) {
            JComponent editor = spinner.getEditor();

            if (editor instanceof JSpinner.DateEditor) {
                JSpinner.DateEditor dateEditor = (JSpinner.DateEditor)editor;
                JFormattedTextField ftf = dateEditor.getTextField();
                Format format = dateEditor.getFormat();
                Object value;

                if (format != null && (value = spinner.getValue()) != null) {
                    SpinnerDateModel model = dateEditor.getModel();
                    DateFormat.Field field = DateFormat.Field.ofCalendarField(
                        model.getCalendarField());

                    if (field != null) {
                        try {
                            AttributedCharacterIterator iterator = format.
                                formatToCharacterIterator(value);
                            if (!select(ftf, iterator, field) &&
                                       field == DateFormat.Field.HOUR0) {
                                select(ftf, iterator, DateFormat.Field.HOUR1);
                            }
                        }
                        catch (IllegalArgumentException iae) {}
                    }
                }
            }
        }

        /**
         * Selects the passed in field, returning true if it is found,
         * false otherwise.
         */
        private boolean select(JFormattedTextField ftf,
                               AttributedCharacterIterator iterator,
                               DateFormat.Field field) {
            int max = ftf.getDocument().getLength();

            iterator.first();
            do {
                Map attrs = iterator.getAttributes();

                if (attrs != null && attrs.containsKey(field)){
                    int start = iterator.getRunStart(field);
                    int end = iterator.getRunLimit(field);

                    if (start != -1 && end != -1 && start <= max &&
                                       end <= max) {
                        ftf.select(start, end);
                    }
                    return true;
                }
            } while (iterator.next() != CharacterIterator.DONE);
            return false;
        }

        /**
         * Returns the calendarField under the start of the selection, or
         * -1 if there is no valid calendar field under the selection (or
         * the spinner isn't editing dates.
         */
        private int getCalendarField(JSpinner spinner) {
            JComponent editor = spinner.getEditor();

            if (editor instanceof JSpinner.DateEditor) {
                JSpinner.DateEditor dateEditor = (JSpinner.DateEditor)editor;
                JFormattedTextField ftf = dateEditor.getTextField();
                int start = ftf.getSelectionStart();
                JFormattedTextField.AbstractFormatter formatter =
                                    ftf.getFormatter();

                if (formatter instanceof InternationalFormatter) {
                    Format.Field[] fields = ((InternationalFormatter)
                                             formatter).getFields(start);

                    for (int counter = 0; counter < fields.length; counter++) {
                        if (fields[counter] instanceof DateFormat.Field) {
                            int calendarField;

                            if (fields[counter] == DateFormat.Field.HOUR1) {
                                calendarField = Calendar.HOUR;
                            }
                            else {
                                calendarField = ((DateFormat.Field)
                                        fields[counter]).getCalendarField();
                            }
                            if (calendarField != -1) {
                                return calendarField;
                            }
                        }
                    }
                }
            }
            return -1;
        }

	public void mousePressed(MouseEvent e) {
	    if (SwingUtilities.isLeftMouseButton(e) && e.getComponent().isEnabled()) {
		spinner = eventToSpinner(e);
		autoRepeatTimer.start();

                focusSpinnerIfNecessary();
	    }
	}

	public void mouseReleased(MouseEvent e) {
	    autoRepeatTimer.stop();	    
	    spinner = null;
	}

        public void mouseClicked(MouseEvent e) {
        }

        public void mouseEntered(MouseEvent e) {
        }

        public void mouseExited(MouseEvent e) {
        }

        /**
         * Requests focus on a child of the spinner if the spinner doesn't
         * have focus.
         */
        private void focusSpinnerIfNecessary() {
            Component fo = KeyboardFocusManager.
                              getCurrentKeyboardFocusManager().getFocusOwner();
            if (spinner.isRequestFocusEnabled() && (
                        fo == null ||
                        !SwingUtilities.isDescendingFrom(fo, spinner))) {
                Container root = spinner;

                if (!root.isFocusCycleRoot()) {
                    root = root.getFocusCycleRootAncestor();
                }
                if (root != null) {
                    FocusTraversalPolicy ftp = root.getFocusTraversalPolicy();
                    Component child = ftp.getComponentAfter(root, spinner);

                    if (child != null && SwingUtilities.isDescendingFrom(
                                                        child, spinner)) {
                        child.requestFocus();
                    }
                }
            }
        }
    }


    /**
     * A simple layout manager for the editor and the next/previous buttons.
     * See the BasicSpinnerUI javadoc for more information about exactly
     * how the components are arranged.
     */
    private static class SpinnerLayout implements LayoutManager 
    {
	private Component nextButton = null;
	private Component previousButton = null;
	private Component editor = null;

	public void addLayoutComponent(String name, Component c) {
	    if ("Next".equals(name)) {
		nextButton = c;
	    }
	    else if ("Previous".equals(name)) {
		previousButton = c;
	    }
	    else if ("Editor".equals(name)) {
		editor = c;
	    }
	}

	public void removeLayoutComponent(Component c) {
	    if (c == nextButton) {
		c = null;
	    }
	    else if (c == previousButton) {
		previousButton = null;
	    }
	    else if (c == editor) {
		editor = null;
	    }
	}

	private Dimension preferredSize(Component c) {
	    return (c == null) ? zeroSize : c.getPreferredSize();
	}

	public Dimension preferredLayoutSize(Container parent) {
	    Dimension nextD = preferredSize(nextButton);
	    Dimension previousD = preferredSize(previousButton);
	    Dimension editorD = preferredSize(editor);

	    /* Force the editors height to be a multiple of 2
	     */
	    editorD.height = ((editorD.height + 1) / 2) * 2;     

	    Dimension size = new Dimension(editorD.width, editorD.height);
	    size.width += Math.max(nextD.width, previousD.width);
	    Insets insets = parent.getInsets();
	    size.width += insets.left + insets.right;
	    size.height += insets.top + insets.bottom;
	    return size;
	}

	public Dimension minimumLayoutSize(Container parent) {
	    return preferredLayoutSize(parent);
	}

	private void setBounds(Component c, int x, int y, int width, int height) {
	    if (c != null) {
		c.setBounds(x, y, width, height);
	    }
	}

	public void layoutContainer(Container parent) {
	    int width  = parent.getWidth();
	    int height = parent.getHeight();

	    Insets insets = parent.getInsets();
	    Dimension nextD = preferredSize(nextButton);
	    Dimension previousD = preferredSize(previousButton);	    
	    int buttonsWidth = Math.max(nextD.width, previousD.width);
	    int editorHeight = height - (insets.top + insets.bottom);

	    // The arrowButtonInsets value is used instead of the JSpinner's
	    // insets if not null. Defining this to be (0, 0, 0, 0) causes the
	    // buttons to be aligned with the outer edge of the spinner's
	    // border, and leaving it as "null" places the buttons completely
	    // inside the spinner's border.
	    Insets buttonInsets = UIManager.getInsets("Spinner.arrowButtonInsets");
	    if (buttonInsets == null) {
		buttonInsets = insets;
	    }

	    /* Deal with the spinner's componentOrientation property.
	     */
	    int editorX, editorWidth, buttonsX;
	    if (parent.getComponentOrientation().isLeftToRight()) {
		editorX = insets.left;
		editorWidth = width - insets.left - buttonsWidth - buttonInsets.right;
		buttonsX = width - buttonsWidth - buttonInsets.right;
	    } else {
		buttonsX = buttonInsets.left;
		editorX = buttonsX + buttonsWidth;
		editorWidth = width - buttonInsets.left - buttonsWidth - insets.right;
	    }

	    int nextY = buttonInsets.top;
	    int nextHeight = (height / 2) + (height % 2) - nextY;
	    int previousY = buttonInsets.top + nextHeight;
	    int previousHeight = height - previousY - buttonInsets.bottom;

	    setBounds(editor,         editorX,  insets.top, editorWidth, editorHeight);
	    setBounds(nextButton,     buttonsX, nextY,      buttonsWidth, nextHeight);
	    setBounds(previousButton, buttonsX, previousY,  buttonsWidth, previousHeight);
	}
    }


    /**
     * Detect JSpinner property changes we're interested in and delegate.  Subclasses
     * shouldn't need to replace the default propertyChangeListener (although they 
     * can by overriding createPropertyChangeListener) since all of the interesting
     * property changes are delegated to protected methods.
     */
    private static class PropertyChangeHandler implements PropertyChangeListener
    {
        public void propertyChange(PropertyChangeEvent e)
        {
            String propertyName = e.getPropertyName();
	    if (e.getSource() instanceof JSpinner) {
		JSpinner spinner = (JSpinner)(e.getSource());
		SpinnerUI spinnerUI = spinner.getUI();

		if (spinnerUI instanceof BasicSpinnerUI) {
		    BasicSpinnerUI ui = (BasicSpinnerUI)spinnerUI;

		    if ("editor".equals(propertyName)) {
			JComponent oldEditor = (JComponent)e.getOldValue();
			JComponent newEditor = (JComponent)e.getNewValue();
			ui.replaceEditor(oldEditor, newEditor);
			ui.updateEnabledState();
		    }
		    else if ("enabled".equals(propertyName)) {
			ui.updateEnabledState();
		    }
		}
	    } else if (e.getSource() instanceof JComponent) {
		JComponent c = (JComponent)e.getSource();
		if ((c.getParent() instanceof JPanel) &&
		    (c.getParent().getParent() instanceof JSpinner) &&
		    "border".equals(propertyName)) {

		    JSpinner spinner = (JSpinner)c.getParent().getParent();
		    SpinnerUI spinnerUI = spinner.getUI();
		    if (spinnerUI instanceof BasicSpinnerUI) {
			BasicSpinnerUI ui = (BasicSpinnerUI)spinnerUI;
			ui.maybeRemoveEditorBorder(c);
		    }
		}
	    }
	}
    }
}