--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/javax/swing/text/FieldView.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,311 @@
+/*
+ * Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+package javax.swing.text;
+
+import java.awt.*;
+import javax.swing.*;
+import javax.swing.event.*;
+
+/**
+ * Extends the multi-line plain text view to be suitable
+ * for a single-line editor view. If the view is
+ * allocated extra space, the field must adjust for it.
+ * If the hosting component is a JTextField, this view
+ * will manage the ranges of the associated BoundedRangeModel
+ * and will adjust the horizontal allocation to match the
+ * current visibility settings of the JTextField.
+ *
+ * @author Timothy Prinzing
+ * @see View
+ */
+public class FieldView extends PlainView {
+
+ /**
+ * Constructs a new FieldView wrapped on an element.
+ *
+ * @param elem the element
+ */
+ public FieldView(Element elem) {
+ super(elem);
+ }
+
+ /**
+ * Fetches the font metrics associated with the component hosting
+ * this view.
+ *
+ * @return the metrics
+ */
+ protected FontMetrics getFontMetrics() {
+ Component c = getContainer();
+ return c.getFontMetrics(c.getFont());
+ }
+
+ /**
+ * Adjusts the allocation given to the view
+ * to be a suitable allocation for a text field.
+ * If the view has been allocated more than the
+ * preferred span vertically, the allocation is
+ * changed to be centered vertically. Horizontally
+ * the view is adjusted according to the horizontal
+ * alignment property set on the associated JTextField
+ * (if that is the type of the hosting component).
+ *
+ * @param a the allocation given to the view, which may need
+ * to be adjusted.
+ * @return the allocation that the superclass should use.
+ */
+ protected Shape adjustAllocation(Shape a) {
+ if (a != null) {
+ Rectangle bounds = a.getBounds();
+ int vspan = (int) getPreferredSpan(Y_AXIS);
+ int hspan = (int) getPreferredSpan(X_AXIS);
+ if (bounds.height != vspan) {
+ int slop = bounds.height - vspan;
+ bounds.y += slop / 2;
+ bounds.height -= slop;
+ }
+
+ // horizontal adjustments
+ Component c = getContainer();
+ if (c instanceof JTextField) {
+ JTextField field = (JTextField) c;
+ BoundedRangeModel vis = field.getHorizontalVisibility();
+ int max = Math.max(hspan, bounds.width);
+ int value = vis.getValue();
+ int extent = Math.min(max, bounds.width - 1);
+ if ((value + extent) > max) {
+ value = max - extent;
+ }
+ vis.setRangeProperties(value, extent, vis.getMinimum(),
+ max, false);
+ if (hspan < bounds.width) {
+ // horizontally align the interior
+ int slop = bounds.width - 1 - hspan;
+
+ int align = ((JTextField)c).getHorizontalAlignment();
+ if(Utilities.isLeftToRight(c)) {
+ if(align==LEADING) {
+ align = LEFT;
+ }
+ else if(align==TRAILING) {
+ align = RIGHT;
+ }
+ }
+ else {
+ if(align==LEADING) {
+ align = RIGHT;
+ }
+ else if(align==TRAILING) {
+ align = LEFT;
+ }
+ }
+
+ switch (align) {
+ case SwingConstants.CENTER:
+ bounds.x += slop / 2;
+ bounds.width -= slop;
+ break;
+ case SwingConstants.RIGHT:
+ bounds.x += slop;
+ bounds.width -= slop;
+ break;
+ }
+ } else {
+ // adjust the allocation to match the bounded range.
+ bounds.width = hspan;
+ bounds.x -= vis.getValue();
+ }
+ }
+ return bounds;
+ }
+ return null;
+ }
+
+ /**
+ * Update the visibility model with the associated JTextField
+ * (if there is one) to reflect the current visibility as a
+ * result of changes to the document model. The bounded
+ * range properties are updated. If the view hasn't yet been
+ * shown the extent will be zero and we just set it to be full
+ * until determined otherwise.
+ */
+ void updateVisibilityModel() {
+ Component c = getContainer();
+ if (c instanceof JTextField) {
+ JTextField field = (JTextField) c;
+ BoundedRangeModel vis = field.getHorizontalVisibility();
+ int hspan = (int) getPreferredSpan(X_AXIS);
+ int extent = vis.getExtent();
+ int maximum = Math.max(hspan, extent);
+ extent = (extent == 0) ? maximum : extent;
+ int value = maximum - extent;
+ int oldValue = vis.getValue();
+ if ((oldValue + extent) > maximum) {
+ oldValue = maximum - extent;
+ }
+ value = Math.max(0, Math.min(value, oldValue));
+ vis.setRangeProperties(value, extent, 0, maximum, false);
+ }
+ }
+
+ // --- View methods -------------------------------------------
+
+ /**
+ * Renders using the given rendering surface and area on that surface.
+ * The view may need to do layout and create child views to enable
+ * itself to render into the given allocation.
+ *
+ * @param g the rendering surface to use
+ * @param a the allocated region to render into
+ *
+ * @see View#paint
+ */
+ public void paint(Graphics g, Shape a) {
+ Rectangle r = (Rectangle) a;
+ g.clipRect(r.x, r.y, r.width, r.height);
+ super.paint(g, a);
+ }
+
+ /**
+ * Adjusts <code>a</code> based on the visible region and returns it.
+ */
+ Shape adjustPaintRegion(Shape a) {
+ return adjustAllocation(a);
+ }
+
+ /**
+ * Determines the preferred span for this view along an
+ * axis.
+ *
+ * @param axis may be either View.X_AXIS or View.Y_AXIS
+ * @return the span the view would like to be rendered into >= 0.
+ * Typically the view is told to render into the span
+ * that is returned, although there is no guarantee.
+ * The parent may choose to resize or break the view.
+ */
+ public float getPreferredSpan(int axis) {
+ switch (axis) {
+ case View.X_AXIS:
+ Segment buff = SegmentCache.getSharedSegment();
+ Document doc = getDocument();
+ int width;
+ try {
+ FontMetrics fm = getFontMetrics();
+ doc.getText(0, doc.getLength(), buff);
+ width = Utilities.getTabbedTextWidth(buff, fm, 0, this, 0);
+ if (buff.count > 0) {
+ Component c = getContainer();
+ firstLineOffset = sun.swing.SwingUtilities2.
+ getLeftSideBearing((c instanceof JComponent) ?
+ (JComponent)c : null, fm,
+ buff.array[buff.offset]);
+ firstLineOffset = Math.max(0, -firstLineOffset);
+ }
+ else {
+ firstLineOffset = 0;
+ }
+ } catch (BadLocationException bl) {
+ width = 0;
+ }
+ SegmentCache.releaseSharedSegment(buff);
+ return width + firstLineOffset;
+ default:
+ return super.getPreferredSpan(axis);
+ }
+ }
+
+ /**
+ * Determines the resizability of the view along the
+ * given axis. A value of 0 or less is not resizable.
+ *
+ * @param axis View.X_AXIS or View.Y_AXIS
+ * @return the weight -> 1 for View.X_AXIS, else 0
+ */
+ public int getResizeWeight(int axis) {
+ if (axis == View.X_AXIS) {
+ return 1;
+ }
+ return 0;
+ }
+
+ /**
+ * Provides a mapping from the document model coordinate space
+ * to the coordinate space of the view mapped to it.
+ *
+ * @param pos the position to convert >= 0
+ * @param a the allocated region to render into
+ * @return the bounding box of the given position
+ * @exception BadLocationException if the given position does not
+ * represent a valid location in the associated document
+ * @see View#modelToView
+ */
+ public Shape modelToView(int pos, Shape a, Position.Bias b) throws BadLocationException {
+ return super.modelToView(pos, adjustAllocation(a), b);
+ }
+
+ /**
+ * Provides a mapping from the view coordinate space to the logical
+ * coordinate space of the model.
+ *
+ * @param fx the X coordinate >= 0.0f
+ * @param fy the Y coordinate >= 0.0f
+ * @param a the allocated region to render into
+ * @return the location within the model that best represents the
+ * given point in the view
+ * @see View#viewToModel
+ */
+ public int viewToModel(float fx, float fy, Shape a, Position.Bias[] bias) {
+ return super.viewToModel(fx, fy, adjustAllocation(a), bias);
+ }
+
+ /**
+ * Gives notification that something was inserted into the document
+ * in a location that this view is responsible for.
+ *
+ * @param changes the change information from the associated document
+ * @param a the current allocation of the view
+ * @param f the factory to use to rebuild if the view has children
+ * @see View#insertUpdate
+ */
+ public void insertUpdate(DocumentEvent changes, Shape a, ViewFactory f) {
+ super.insertUpdate(changes, adjustAllocation(a), f);
+ updateVisibilityModel();
+ }
+
+ /**
+ * Gives notification that something was removed from the document
+ * in a location that this view is responsible for.
+ *
+ * @param changes the change information from the associated document
+ * @param a the current allocation of the view
+ * @param f the factory to use to rebuild if the view has children
+ * @see View#removeUpdate
+ */
+ public void removeUpdate(DocumentEvent changes, Shape a, ViewFactory f) {
+ super.removeUpdate(changes, adjustAllocation(a), f);
+ updateVisibilityModel();
+ }
+
+}