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jeremybenn |
/* FieldView.java --
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Copyright (C) 2004, 2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.swing.text;
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import java.awt.Component;
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import java.awt.Container;
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import java.awt.FontMetrics;
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import java.awt.Graphics;
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import java.awt.Insets;
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import java.awt.Rectangle;
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import java.awt.Shape;
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import javax.swing.BoundedRangeModel;
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import javax.swing.JTextField;
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import javax.swing.SwingUtilities;
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import javax.swing.event.ChangeEvent;
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import javax.swing.event.ChangeListener;
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import javax.swing.event.DocumentEvent;
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public class FieldView extends PlainView
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{
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BoundedRangeModel horizontalVisibility;
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/** Caches the preferred span of the X axis. It is invalidated by
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* setting it to -1f. This is done when text in the document
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* is inserted, removed or changed. The value is corrected as
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* soon as calculateHorizontalSpan() is called.
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*/
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float cachedSpan = -1f;
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public FieldView(Element elem)
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{
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super(elem);
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}
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/** Checks whether the given container is a JTextField. If so
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* it retrieves the textfield's horizontalVisibility instance.
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*
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* <p>This method should be only called when the view's container
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* is valid. Naturally that would be the setParent() method however
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* that method is not overridden in the RI and that is why we chose
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* paint() instead.</p>
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*/
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private void checkContainer()
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{
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Container c = getContainer();
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if (c instanceof JTextField)
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{
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horizontalVisibility = ((JTextField) c).getHorizontalVisibility();
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// Provokes a repaint when the BoundedRangeModel's values change
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// (which is what the RI does).
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horizontalVisibility.addChangeListener(new ChangeListener(){
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public void stateChanged(ChangeEvent event) {
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getContainer().repaint();
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}
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});
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// It turned out that the span calculated at this point is wrong
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// and needs to be recalculated (e.g. a different font setting is
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// not taken into account).
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calculateHorizontalSpan();
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// Initializes the BoundedRangeModel properly.
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updateVisibility();
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}
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}
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private void updateVisibility()
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{
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JTextField tf = (JTextField) getContainer();
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Insets insets = tf.getInsets();
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int width = tf.getWidth() - insets.left - insets.right;
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horizontalVisibility.setMaximum(Math.max((int) ((cachedSpan != -1f)
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? cachedSpan
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: calculateHorizontalSpan()),
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width));
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horizontalVisibility.setExtent(width - 1);
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}
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protected FontMetrics getFontMetrics()
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{
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Component container = getContainer();
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return container.getFontMetrics(container.getFont());
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}
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/**
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* Vertically centers the single line of text within the
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* bounds of the input shape. The returned Rectangle is centered
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* vertically within <code>shape</code> and has a height of the
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* preferred span along the Y axis. Horizontal adjustment is done according
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* to the horizontalAligment property of the component that is rendered.
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*
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* @param shape the shape within which the line is beeing centered
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*/
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protected Shape adjustAllocation(Shape shape)
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{
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// Return null when the original allocation is null (like the RI).
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if (shape == null)
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return null;
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Rectangle rectIn = shape.getBounds();
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// vertical adjustment
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int height = (int) getPreferredSpan(Y_AXIS);
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int y = rectIn.y + (rectIn.height - height) / 2;
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// horizontal adjustment
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JTextField textField = (JTextField) getContainer();
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int width = (int) ((cachedSpan != -1f) ? cachedSpan : calculateHorizontalSpan());
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int x;
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if (horizontalVisibility != null && horizontalVisibility.getExtent() < width)
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x = rectIn.x - horizontalVisibility.getValue();
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else
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switch (textField.getHorizontalAlignment())
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{
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case JTextField.CENTER:
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x = rectIn.x + (rectIn.width - width) / 2;
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break;
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case JTextField.RIGHT:
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x = rectIn.x + (rectIn.width - width - 1);
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break;
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case JTextField.TRAILING:
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if (textField.getComponentOrientation().isLeftToRight())
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x = rectIn.x + (rectIn.width - width - 1);
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else
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x = rectIn.x;
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break;
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case JTextField.LEADING:
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if (textField.getComponentOrientation().isLeftToRight())
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x = rectIn.x;
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else
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x = rectIn.x + (rectIn.width - width - 1);
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break;
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case JTextField.LEFT:
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default:
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x = rectIn.x;
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break;
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}
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return new Rectangle(x, y, width, height);
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}
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public float getPreferredSpan(int axis)
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{
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if (axis != X_AXIS && axis != Y_AXIS)
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throw new IllegalArgumentException();
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if (axis == Y_AXIS)
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return super.getPreferredSpan(axis);
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if (cachedSpan != -1f)
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return cachedSpan;
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return calculateHorizontalSpan();
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}
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/** Calculates and sets the horizontal span and stores the value
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* in cachedSpan.
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*/
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private float calculateHorizontalSpan()
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{
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Segment s = getLineBuffer();
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Element elem = getElement();
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try
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{
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elem.getDocument().getText(elem.getStartOffset(),
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elem.getEndOffset() - 1,
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s);
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return cachedSpan = Utilities.getTabbedTextWidth(s, getFontMetrics(), 0, this, s.offset);
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}
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catch (BadLocationException e)
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{
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// Should never happen
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AssertionError ae = new AssertionError();
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ae.initCause(e);
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throw ae;
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}
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}
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public int getResizeWeight(int axis)
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{
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return axis == X_AXIS ? 1 : 0;
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}
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public Shape modelToView(int pos, Shape a, Position.Bias bias)
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throws BadLocationException
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{
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Shape newAlloc = adjustAllocation(a);
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return super.modelToView(pos, newAlloc, bias);
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}
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public void paint(Graphics g, Shape s)
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{
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if (horizontalVisibility == null)
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checkContainer();
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Shape newAlloc = adjustAllocation(s);
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Shape clip = g.getClip();
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if (clip != null)
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{
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// Reason for this: The allocation area is always determined by the
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// size of the component (and its insets) regardless of whether
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// parts of the component are invisible or not (e.g. when the
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// component is part of a JScrollPane and partly moved out of
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// the user-visible range). However the clip of the Graphics
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// instance may be adjusted properly to that condition but
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// does not handle insets. By calculating the intersection
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// we get the correct clip to paint the text in all cases.
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Rectangle r = s.getBounds();
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Rectangle cb = clip.getBounds();
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SwingUtilities.computeIntersection(r.x, r.y, r.width, r.height, cb);
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g.setClip(cb);
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}
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else
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g.setClip(s);
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super.paint(g, newAlloc);
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g.setClip(clip);
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}
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public void insertUpdate(DocumentEvent ev, Shape shape, ViewFactory vf)
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{
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cachedSpan = -1f;
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if (horizontalVisibility != null)
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updateVisibility();
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Shape newAlloc = adjustAllocation(shape);
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super.insertUpdate(ev, newAlloc, vf);
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getContainer().repaint();
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}
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public void removeUpdate(DocumentEvent ev, Shape shape, ViewFactory vf)
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{
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cachedSpan = -1f;
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if (horizontalVisibility != null)
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updateVisibility();
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Shape newAlloc = adjustAllocation(shape);
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super.removeUpdate(ev, newAlloc, vf);
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getContainer().repaint();
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}
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public void changedUpdate(DocumentEvent ev, Shape shape, ViewFactory vf)
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{
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cachedSpan = -1f;
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if (horizontalVisibility != null)
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updateVisibility();
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Shape newAlloc = adjustAllocation(shape);
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super.changedUpdate(ev, newAlloc, vf);
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getContainer().repaint();
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}
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public int viewToModel(float fx, float fy, Shape a, Position.Bias[] bias)
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{
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return super.viewToModel(fx, fy, adjustAllocation(a), bias);
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}
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}
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