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312 lines
10 KiB
312 lines
10 KiB
/*
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* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.swing.text;
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import java.awt.*;
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import javax.swing.*;
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import javax.swing.event.*;
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/**
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* Extends the multi-line plain text view to be suitable
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* for a single-line editor view. If the view is
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* allocated extra space, the field must adjust for it.
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* If the hosting component is a JTextField, this view
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* will manage the ranges of the associated BoundedRangeModel
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* and will adjust the horizontal allocation to match the
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* current visibility settings of the JTextField.
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*
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* @author Timothy Prinzing
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* @see View
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*/
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public class FieldView extends PlainView {
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/**
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* Constructs a new FieldView wrapped on an element.
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*
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* @param elem the element
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*/
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public FieldView(Element elem) {
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super(elem);
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}
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/**
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* Fetches the font metrics associated with the component hosting
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* this view.
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*
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* @return the metrics
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*/
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protected FontMetrics getFontMetrics() {
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Component c = getContainer();
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return c.getFontMetrics(c.getFont());
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}
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/**
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* Adjusts the allocation given to the view
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* to be a suitable allocation for a text field.
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* If the view has been allocated more than the
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* preferred span vertically, the allocation is
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* changed to be centered vertically. Horizontally
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* the view is adjusted according to the horizontal
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* alignment property set on the associated JTextField
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* (if that is the type of the hosting component).
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*
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* @param a the allocation given to the view, which may need
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* to be adjusted.
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* @return the allocation that the superclass should use.
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*/
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protected Shape adjustAllocation(Shape a) {
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if (a != null) {
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Rectangle bounds = a.getBounds();
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int vspan = (int) getPreferredSpan(Y_AXIS);
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int hspan = (int) getPreferredSpan(X_AXIS);
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if (bounds.height != vspan) {
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int slop = bounds.height - vspan;
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bounds.y += slop / 2;
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bounds.height -= slop;
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}
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// horizontal adjustments
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Component c = getContainer();
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if (c instanceof JTextField) {
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JTextField field = (JTextField) c;
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BoundedRangeModel vis = field.getHorizontalVisibility();
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int max = Math.max(hspan, bounds.width);
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int value = vis.getValue();
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int extent = Math.min(max, bounds.width - 1);
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if ((value + extent) > max) {
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value = max - extent;
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}
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vis.setRangeProperties(value, extent, vis.getMinimum(),
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max, false);
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if (hspan < bounds.width) {
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// horizontally align the interior
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int slop = bounds.width - 1 - hspan;
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int align = ((JTextField)c).getHorizontalAlignment();
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if(Utilities.isLeftToRight(c)) {
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if(align==LEADING) {
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align = LEFT;
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}
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else if(align==TRAILING) {
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align = RIGHT;
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}
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}
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else {
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if(align==LEADING) {
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align = RIGHT;
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}
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else if(align==TRAILING) {
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align = LEFT;
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}
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}
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switch (align) {
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case SwingConstants.CENTER:
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bounds.x += slop / 2;
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bounds.width -= slop;
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break;
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case SwingConstants.RIGHT:
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bounds.x += slop;
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bounds.width -= slop;
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break;
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}
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} else {
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// adjust the allocation to match the bounded range.
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bounds.width = hspan;
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bounds.x -= vis.getValue();
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}
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}
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return bounds;
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}
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return null;
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}
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/**
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* Update the visibility model with the associated JTextField
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* (if there is one) to reflect the current visibility as a
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* result of changes to the document model. The bounded
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* range properties are updated. If the view hasn't yet been
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* shown the extent will be zero and we just set it to be full
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* until determined otherwise.
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*/
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void updateVisibilityModel() {
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Component c = getContainer();
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if (c instanceof JTextField) {
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JTextField field = (JTextField) c;
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BoundedRangeModel vis = field.getHorizontalVisibility();
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int hspan = (int) getPreferredSpan(X_AXIS);
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int extent = vis.getExtent();
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int maximum = Math.max(hspan, extent);
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extent = (extent == 0) ? maximum : extent;
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int value = maximum - extent;
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int oldValue = vis.getValue();
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if ((oldValue + extent) > maximum) {
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oldValue = maximum - extent;
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}
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value = Math.max(0, Math.min(value, oldValue));
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vis.setRangeProperties(value, extent, 0, maximum, false);
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}
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}
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// --- View methods -------------------------------------------
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/**
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* Renders using the given rendering surface and area on that surface.
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* The view may need to do layout and create child views to enable
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* itself to render into the given allocation.
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*
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* @param g the rendering surface to use
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* @param a the allocated region to render into
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*
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* @see View#paint
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*/
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public void paint(Graphics g, Shape a) {
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Rectangle r = (Rectangle) a;
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g.clipRect(r.x, r.y, r.width, r.height);
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super.paint(g, a);
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}
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/**
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* Adjusts <code>a</code> based on the visible region and returns it.
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*/
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Shape adjustPaintRegion(Shape a) {
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return adjustAllocation(a);
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}
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/**
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* Determines the preferred span for this view along an
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* axis.
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*
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* @param axis may be either View.X_AXIS or View.Y_AXIS
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* @return the span the view would like to be rendered into >= 0.
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* Typically the view is told to render into the span
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* that is returned, although there is no guarantee.
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* The parent may choose to resize or break the view.
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*/
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public float getPreferredSpan(int axis) {
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switch (axis) {
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case View.X_AXIS:
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Segment buff = SegmentCache.getSharedSegment();
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Document doc = getDocument();
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int width;
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try {
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FontMetrics fm = getFontMetrics();
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doc.getText(0, doc.getLength(), buff);
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width = Utilities.getTabbedTextWidth(buff, fm, 0, this, 0);
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if (buff.count > 0) {
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Component c = getContainer();
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firstLineOffset = sun.swing.SwingUtilities2.
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getLeftSideBearing((c instanceof JComponent) ?
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(JComponent)c : null, fm,
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buff.array[buff.offset]);
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firstLineOffset = Math.max(0, -firstLineOffset);
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}
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else {
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firstLineOffset = 0;
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}
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} catch (BadLocationException bl) {
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width = 0;
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}
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SegmentCache.releaseSharedSegment(buff);
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return width + firstLineOffset;
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default:
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return super.getPreferredSpan(axis);
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}
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}
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/**
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* Determines the resizability of the view along the
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* given axis. A value of 0 or less is not resizable.
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*
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* @param axis View.X_AXIS or View.Y_AXIS
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* @return the weight -> 1 for View.X_AXIS, else 0
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*/
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public int getResizeWeight(int axis) {
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if (axis == View.X_AXIS) {
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return 1;
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}
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return 0;
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}
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/**
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* Provides a mapping from the document model coordinate space
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* to the coordinate space of the view mapped to it.
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*
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* @param pos the position to convert >= 0
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* @param a the allocated region to render into
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* @return the bounding box of the given position
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* @exception BadLocationException if the given position does not
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* represent a valid location in the associated document
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* @see View#modelToView
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*/
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public Shape modelToView(int pos, Shape a, Position.Bias b) throws BadLocationException {
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return super.modelToView(pos, adjustAllocation(a), b);
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}
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/**
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* Provides a mapping from the view coordinate space to the logical
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* coordinate space of the model.
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*
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* @param fx the X coordinate >= 0.0f
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* @param fy the Y coordinate >= 0.0f
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* @param a the allocated region to render into
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* @return the location within the model that best represents the
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* given point in the view
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* @see View#viewToModel
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*/
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public int viewToModel(float fx, float fy, Shape a, Position.Bias[] bias) {
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return super.viewToModel(fx, fy, adjustAllocation(a), bias);
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}
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/**
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* Gives notification that something was inserted into the document
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* in a location that this view is responsible for.
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*
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* @param changes the change information from the associated document
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* @param a the current allocation of the view
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* @param f the factory to use to rebuild if the view has children
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* @see View#insertUpdate
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*/
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public void insertUpdate(DocumentEvent changes, Shape a, ViewFactory f) {
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super.insertUpdate(changes, adjustAllocation(a), f);
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updateVisibilityModel();
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}
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/**
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* Gives notification that something was removed from the document
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* in a location that this view is responsible for.
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*
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* @param changes the change information from the associated document
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* @param a the current allocation of the view
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* @param f the factory to use to rebuild if the view has children
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* @see View#removeUpdate
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*/
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public void removeUpdate(DocumentEvent changes, Shape a, ViewFactory f) {
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super.removeUpdate(changes, adjustAllocation(a), f);
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updateVisibilityModel();
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}
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}
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