JDK8/Java8源码在线阅读
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* 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package javax.swing;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
import javax.swing.text.*;
import javax.swing.event.*;
import javax.swing.plaf.*;
/**
* A text component that can be marked up with attributes that are
* represented graphically.
* You can find how-to information and examples of using text panes in
* <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/text.html">Using Text Components</a>,
* a section in <em>The Java Tutorial.</em>
*
* <p>
* This component models paragraphs
* that are composed of runs of character level attributes. Each
* paragraph may have a logical style attached to it which contains
* the default attributes to use if not overridden by attributes set
* on the paragraph or character run. Components and images may
* be embedded in the flow of text.
*
* <dl>
* <dt><b><font size=+1>Newlines</font></b>
* <dd>
* For a discussion on how newlines are handled, see
* <a href="text/DefaultEditorKit.html">DefaultEditorKit</a>.
* </dl>
*
* <p>
* <strong>Warning:</strong> Swing is not thread safe. For more
* information see <a
* href="package-summary.html#threading">Swing's Threading
* Policy</a>.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @beaninfo
* attribute: isContainer true
* description: A text component that can be marked up with attributes that are graphically represented.
*
* @author Timothy Prinzing
* @see javax.swing.text.StyledEditorKit
*/
public class JTextPane extends JEditorPane {
/**
* Creates a new <code>JTextPane</code>. A new instance of
* <code>StyledEditorKit</code> is
* created and set, and the document model set to <code>null</code>.
*/
public JTextPane() {
super();
EditorKit editorKit = createDefaultEditorKit();
String contentType = editorKit.getContentType();
if (contentType != null
&& getEditorKitClassNameForContentType(contentType) ==
defaultEditorKitMap.get(contentType)) {
setEditorKitForContentType(contentType, editorKit);
}
setEditorKit(editorKit);
}
/**
* Creates a new <code>JTextPane</code>, with a specified document model.
* A new instance of <code>javax.swing.text.StyledEditorKit</code>
* is created and set.
*
* @param doc the document model
*/
public JTextPane(StyledDocument doc) {
this();
setStyledDocument(doc);
}
/**
* Returns the class ID for the UI.
*
* @return the string "TextPaneUI"
*
* @see JComponent#getUIClassID
* @see UIDefaults#getUI
*/
public String getUIClassID() {
return uiClassID;
}
/**
* Associates the editor with a text document. This
* must be a <code>StyledDocument</code>.
*
* @param doc the document to display/edit
* @exception IllegalArgumentException if <code>doc</code> can't
* be narrowed to a <code>StyledDocument</code> which is the
* required type of model for this text component
*/
public void setDocument(Document doc) {
if (doc instanceof StyledDocument) {
super.setDocument(doc);
} else {
throw new IllegalArgumentException("Model must be StyledDocument");
}
}
/**
* Associates the editor with a text document.
* The currently registered factory is used to build a view for
* the document, which gets displayed by the editor.
*
* @param doc the document to display/edit
*/
public void setStyledDocument(StyledDocument doc) {
super.setDocument(doc);
}
/**
* Fetches the model associated with the editor.
*
* @return the model
*/
public StyledDocument getStyledDocument() {
return (StyledDocument) getDocument();
}
/**
* Replaces the currently selected content with new content
* represented by the given string. If there is no selection
* this amounts to an insert of the given text. If there
* is no replacement text this amounts to a removal of the
* current selection. The replacement text will have the
* attributes currently defined for input at the point of
* insertion. If the document is not editable, beep and return.
*
* @param content the content to replace the selection with
*/
@Override
public void replaceSelection(String content) {
replaceSelection(content, true);
}
private void replaceSelection(String content, boolean checkEditable) {
if (checkEditable && !isEditable()) {
UIManager.getLookAndFeel().provideErrorFeedback(JTextPane.this);
return;
}
Document doc = getStyledDocument();
if (doc != null) {
try {
Caret caret = getCaret();
boolean composedTextSaved = saveComposedText(caret.getDot());
int p0 = Math.min(caret.getDot(), caret.getMark());
int p1 = Math.max(caret.getDot(), caret.getMark());
AttributeSet attr = getInputAttributes().copyAttributes();
if (doc instanceof AbstractDocument) {
((AbstractDocument)doc).replace(p0, p1 - p0, content,attr);
}
else {
if (p0 != p1) {
doc.remove(p0, p1 - p0);
}
if (content != null && content.length() > 0) {
doc.insertString(p0, content, attr);
}
}
if (composedTextSaved) {
restoreComposedText();
}
} catch (BadLocationException e) {
UIManager.getLookAndFeel().provideErrorFeedback(JTextPane.this);
}
}
}
/**
* Inserts a component into the document as a replacement
* for the currently selected content. If there is no
* selection the component is effectively inserted at the
* current position of the caret. This is represented in
* the associated document as an attribute of one character
* of content.
* <p>
* The component given is the actual component used by the
* JTextPane. Since components cannot be a child of more than
* one container, this method should not be used in situations
* where the model is shared by text components.
* <p>
* The component is placed relative to the text baseline
* according to the value returned by
* <code>Component.getAlignmentY</code>. For Swing components
* this value can be conveniently set using the method
* <code>JComponent.setAlignmentY</code>. For example, setting
* a value of <code>0.75</code> will cause 75 percent of the
* component to be above the baseline, and 25 percent of the
* component to be below the baseline.
*
* @param c the component to insert
*/
public void insertComponent(Component c) {
MutableAttributeSet inputAttributes = getInputAttributes();
inputAttributes.removeAttributes(inputAttributes);
StyleConstants.setComponent(inputAttributes, c);
replaceSelection(" ", false);
inputAttributes.removeAttributes(inputAttributes);
}
/**
* Inserts an icon into the document as a replacement
* for the currently selected content. If there is no
* selection the icon is effectively inserted at the
* current position of the caret. This is represented in
* the associated document as an attribute of one character
* of content.
*
* @param g the icon to insert
* @see Icon
*/
public void insertIcon(Icon g) {
MutableAttributeSet inputAttributes = getInputAttributes();
inputAttributes.removeAttributes(inputAttributes);
StyleConstants.setIcon(inputAttributes, g);
replaceSelection(" ", false);
inputAttributes.removeAttributes(inputAttributes);
}
/**
* Adds a new style into the logical style hierarchy. Style attributes
* resolve from bottom up so an attribute specified in a child
* will override an attribute specified in the parent.
*
* @param nm the name of the style (must be unique within the
* collection of named styles). The name may be <code>null</code>
* if the style is unnamed, but the caller is responsible
* for managing the reference returned as an unnamed style can't
* be fetched by name. An unnamed style may be useful for things
* like character attribute overrides such as found in a style
* run.
* @param parent the parent style. This may be <code>null</code>
* if unspecified
* attributes need not be resolved in some other style.
* @return the new <code>Style</code>
*/
public Style addStyle(String nm, Style parent) {
StyledDocument doc = getStyledDocument();
return doc.addStyle(nm, parent);
}
/**
* Removes a named non-<code>null</code> style previously added to
* the document.
*
* @param nm the name of the style to remove
*/
public void removeStyle(String nm) {
StyledDocument doc = getStyledDocument();
doc.removeStyle(nm);
}
/**
* Fetches a named non-<code>null</code> style previously added.
*
* @param nm the name of the style
* @return the <code>Style</code>
*/
public Style getStyle(String nm) {
StyledDocument doc = getStyledDocument();
return doc.getStyle(nm);
}
/**
* Sets the logical style to use for the paragraph at the
* current caret position. If attributes aren't explicitly set
* for character and paragraph attributes they will resolve
* through the logical style assigned to the paragraph, which
* in term may resolve through some hierarchy completely
* independent of the element hierarchy in the document.
*
* @param s the logical style to assign to the paragraph,
* or <code>null</code> for no style
*/
public void setLogicalStyle(Style s) {
StyledDocument doc = getStyledDocument();
doc.setLogicalStyle(getCaretPosition(), s);
}
/**
* Fetches the logical style assigned to the paragraph represented
* by the current position of the caret, or <code>null</code>.
*
* @return the <code>Style</code>
*/
public Style getLogicalStyle() {
StyledDocument doc = getStyledDocument();
return doc.getLogicalStyle(getCaretPosition());
}
/**
* Fetches the character attributes in effect at the
* current location of the caret, or <code>null</code>.
*
* @return the attributes, or <code>null</code>
*/
public AttributeSet getCharacterAttributes() {
StyledDocument doc = getStyledDocument();
Element run = doc.getCharacterElement(getCaretPosition());
if (run != null) {
return run.getAttributes();
}
return null;
}
/**
* Applies the given attributes to character
* content. If there is a selection, the attributes
* are applied to the selection range. If there
* is no selection, the attributes are applied to
* the input attribute set which defines the attributes
* for any new text that gets inserted.
*
* @param attr the attributes
* @param replace if true, then replace the existing attributes first
*/
public void setCharacterAttributes(AttributeSet attr, boolean replace) {
int p0 = getSelectionStart();
int p1 = getSelectionEnd();
if (p0 != p1) {
StyledDocument doc = getStyledDocument();
doc.setCharacterAttributes(p0, p1 - p0, attr, replace);
} else {
MutableAttributeSet inputAttributes = getInputAttributes();
if (replace) {
inputAttributes.removeAttributes(inputAttributes);
}
inputAttributes.addAttributes(attr);
}
}
/**
* Fetches the current paragraph attributes in effect
* at the location of the caret, or <code>null</code> if none.
*
* @return the attributes
*/
public AttributeSet getParagraphAttributes() {
StyledDocument doc = getStyledDocument();
Element paragraph = doc.getParagraphElement(getCaretPosition());
if (paragraph != null) {
return paragraph.getAttributes();
}
return null;
}
/**
* Applies the given attributes to paragraphs. If
* there is a selection, the attributes are applied
* to the paragraphs that intersect the selection.
* If there is no selection, the attributes are applied
* to the paragraph at the current caret position.
*
* @param attr the non-<code>null</code> attributes
* @param replace if true, replace the existing attributes first
*/
public void setParagraphAttributes(AttributeSet attr, boolean replace) {
int p0 = getSelectionStart();
int p1 = getSelectionEnd();
StyledDocument doc = getStyledDocument();
doc.setParagraphAttributes(p0, p1 - p0, attr, replace);
}
/**
* Gets the input attributes for the pane.
*
* @return the attributes
*/
public MutableAttributeSet getInputAttributes() {
return getStyledEditorKit().getInputAttributes();
}
/**
* Gets the editor kit.
*
* @return the editor kit
*/
protected final StyledEditorKit getStyledEditorKit() {
return (StyledEditorKit) getEditorKit();
}
/**
* @see #getUIClassID
* @see #readObject
*/
private static final String uiClassID = "TextPaneUI";
/**
* See <code>readObject</code> and <code>writeObject</code> in
* <code>JComponent</code> for more
* information about serialization in Swing.
*
* @param s the output stream
*/
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