author | malenkov |
Tue, 29 Oct 2013 17:01:06 +0400 | |
changeset 21278 | ef8a3a2a72f2 |
parent 9035 | 1255eb81cc2f |
child 23010 | 6dadb192ad81 |
permissions | -rw-r--r-- |
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/* |
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7033660: Update copyright year to 2011 on any files changed in 2011
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* Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package javax.swing.text.html; |
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import java.awt.*; |
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import javax.swing.SizeRequirements; |
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import javax.swing.event.DocumentEvent; |
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import javax.swing.text.Document; |
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import javax.swing.text.Element; |
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import javax.swing.text.AttributeSet; |
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import javax.swing.text.StyleConstants; |
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import javax.swing.text.View; |
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import javax.swing.text.ViewFactory; |
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import javax.swing.text.BadLocationException; |
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import javax.swing.text.JTextComponent; |
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/** |
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* Displays the a paragraph, and uses css attributes for its |
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* configuration. |
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* |
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* @author Timothy Prinzing |
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*/ |
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public class ParagraphView extends javax.swing.text.ParagraphView { |
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/** |
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* Constructs a ParagraphView for the given element. |
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* |
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* @param elem the element that this view is responsible for |
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*/ |
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public ParagraphView(Element elem) { |
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super(elem); |
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} |
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/** |
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* Establishes the parent view for this view. This is |
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* guaranteed to be called before any other methods if the |
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* parent view is functioning properly. |
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* <p> |
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* This is implemented |
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* to forward to the superclass as well as call the |
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* {@link #setPropertiesFromAttributes setPropertiesFromAttributes} |
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* method to set the paragraph properties from the css |
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* attributes. The call is made at this time to ensure |
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* the ability to resolve upward through the parents |
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* view attributes. |
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* |
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* @param parent the new parent, or null if the view is |
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* being removed from a parent it was previously added |
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* to |
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*/ |
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public void setParent(View parent) { |
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super.setParent(parent); |
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if (parent != null) { |
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setPropertiesFromAttributes(); |
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} |
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} |
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/** |
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* Fetches the attributes to use when rendering. This is |
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* implemented to multiplex the attributes specified in the |
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* model with a StyleSheet. |
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*/ |
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public AttributeSet getAttributes() { |
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if (attr == null) { |
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StyleSheet sheet = getStyleSheet(); |
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attr = sheet.getViewAttributes(this); |
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} |
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return attr; |
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} |
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/** |
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* Sets up the paragraph from css attributes instead of |
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* the values found in StyleConstants (i.e. which are used |
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* by the superclass). Since |
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*/ |
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protected void setPropertiesFromAttributes() { |
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StyleSheet sheet = getStyleSheet(); |
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attr = sheet.getViewAttributes(this); |
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painter = sheet.getBoxPainter(attr); |
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if (attr != null) { |
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super.setPropertiesFromAttributes(); |
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setInsets((short) painter.getInset(TOP, this), |
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(short) painter.getInset(LEFT, this), |
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(short) painter.getInset(BOTTOM, this), |
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(short) painter.getInset(RIGHT, this)); |
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Object o = attr.getAttribute(CSS.Attribute.TEXT_ALIGN); |
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if (o != null) { |
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// set horizontal alignment |
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String ta = o.toString(); |
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if (ta.equals("left")) { |
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setJustification(StyleConstants.ALIGN_LEFT); |
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} else if (ta.equals("center")) { |
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setJustification(StyleConstants.ALIGN_CENTER); |
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} else if (ta.equals("right")) { |
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setJustification(StyleConstants.ALIGN_RIGHT); |
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} else if (ta.equals("justify")) { |
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setJustification(StyleConstants.ALIGN_JUSTIFIED); |
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} |
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} |
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// Get the width/height |
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cssWidth = (CSS.LengthValue)attr.getAttribute( |
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CSS.Attribute.WIDTH); |
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cssHeight = (CSS.LengthValue)attr.getAttribute( |
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CSS.Attribute.HEIGHT); |
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} |
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} |
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protected StyleSheet getStyleSheet() { |
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HTMLDocument doc = (HTMLDocument) getDocument(); |
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return doc.getStyleSheet(); |
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} |
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/** |
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* Calculate the needs for the paragraph along the minor axis. |
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* |
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* <p>If size requirements are explicitly specified for the paragraph, |
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* use that requirements. Otherwise, use the requirements of the |
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* superclass {@link javax.swing.text.ParagraphView}.</p> |
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* |
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* <p>If the {@code axis} parameter is neither {@code View.X_AXIS} nor |
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* {@code View.Y_AXIS}, {@link IllegalArgumentException} is thrown. If the |
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* {@code r} parameter is {@code null,} a new {@code SizeRequirements} |
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* object is created, otherwise the supplied {@code SizeRequirements} |
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* object is returned.</p> |
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* |
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* @param axis the minor axis |
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* @param r the input {@code SizeRequirements} object |
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* @return the new or adjusted {@code SizeRequirements} object |
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* @throws IllegalArgumentException if the {@code axis} parameter is invalid |
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*/ |
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protected SizeRequirements calculateMinorAxisRequirements( |
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int axis, SizeRequirements r) { |
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r = super.calculateMinorAxisRequirements(axis, r); |
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if (BlockView.spanSetFromAttributes(axis, r, cssWidth, cssHeight)) { |
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// Offset by the margins so that pref/min/max return the |
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// right value. |
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int margin = (axis == X_AXIS) ? getLeftInset() + getRightInset() : |
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getTopInset() + getBottomInset(); |
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r.minimum -= margin; |
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r.preferred -= margin; |
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r.maximum -= margin; |
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} |
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return r; |
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} |
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/** |
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* Indicates whether or not this view should be |
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* displayed. If none of the children wish to be |
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* displayed and the only visible child is the |
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* break that ends the paragraph, the paragraph |
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* will not be considered visible. Otherwise, |
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* it will be considered visible and return true. |
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* |
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* @return true if the paragraph should be displayed |
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*/ |
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public boolean isVisible() { |
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int n = getLayoutViewCount() - 1; |
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for (int i = 0; i < n; i++) { |
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View v = getLayoutView(i); |
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if (v.isVisible()) { |
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return true; |
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} |
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} |
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if (n > 0) { |
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View v = getLayoutView(n); |
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if ((v.getEndOffset() - v.getStartOffset()) == 1) { |
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return false; |
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} |
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} |
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// If it's the last paragraph and not editable, it shouldn't |
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// be visible. |
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if (getStartOffset() == getDocument().getLength()) { |
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boolean editable = false; |
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Component c = getContainer(); |
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if (c instanceof JTextComponent) { |
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editable = ((JTextComponent)c).isEditable(); |
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} |
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if (!editable) { |
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return false; |
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} |
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} |
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return true; |
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} |
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/** |
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* Renders using the given rendering surface and area on that |
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* surface. This is implemented to delegate to the superclass |
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* after stashing the base coordinate for tab calculations. |
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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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* @see View#paint |
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*/ |
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public void paint(Graphics g, Shape a) { |
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if (a == null) { |
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return; |
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} |
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Rectangle r; |
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if (a instanceof Rectangle) { |
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r = (Rectangle) a; |
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} else { |
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r = a.getBounds(); |
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} |
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painter.paint(g, r.x, r.y, r.width, r.height, this); |
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super.paint(g, a); |
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} |
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/** |
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* Determines the preferred span for this view. Returns |
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* 0 if the view is not visible, otherwise it calls the |
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* superclass method to get the preferred span. |
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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; |
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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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* @see javax.swing.text.ParagraphView#getPreferredSpan |
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*/ |
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public float getPreferredSpan(int axis) { |
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if (!isVisible()) { |
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return 0; |
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} |
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return super.getPreferredSpan(axis); |
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} |
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/** |
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* Determines the minimum span for this view along an |
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* axis. Returns 0 if the view is not visible, otherwise |
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* it calls the superclass method to get the minimum span. |
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* |
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* @param axis may be either <code>View.X_AXIS</code> or |
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* <code>View.Y_AXIS</code> |
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* @return the minimum span the view can be rendered into |
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* @see javax.swing.text.ParagraphView#getMinimumSpan |
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*/ |
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public float getMinimumSpan(int axis) { |
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if (!isVisible()) { |
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return 0; |
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} |
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return super.getMinimumSpan(axis); |
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} |
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/** |
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* Determines the maximum span for this view along an |
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* axis. Returns 0 if the view is not visible, otherwise |
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* it calls the superclass method ot get the maximum span. |
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* |
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* @param axis may be either <code>View.X_AXIS</code> or |
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* <code>View.Y_AXIS</code> |
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* @return the maximum span the view can be rendered into |
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* @see javax.swing.text.ParagraphView#getMaximumSpan |
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*/ |
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public float getMaximumSpan(int axis) { |
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if (!isVisible()) { |
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return 0; |
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} |
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return super.getMaximumSpan(axis); |
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} |
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private AttributeSet attr; |
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private StyleSheet.BoxPainter painter; |
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private CSS.LengthValue cssWidth; |
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private CSS.LengthValue cssHeight; |
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} |