JDK8/Java8源码在线阅读
/*
* Copyright (c) 1997, 2013, Oracle and/or its affiliates. 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. 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.
*
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package javax.swing.plaf.basic;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.FocusEvent;
import java.awt.event.InputEvent;
import java.beans.PropertyChangeEvent;
import java.io.Reader;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.plaf.*;
import sun.swing.DefaultLookup;
/**
* Basis of a look and feel for a JTextField.
* <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}.
*
* @author Timothy Prinzing
*/
public class BasicTextFieldUI extends BasicTextUI {
/**
* Creates a UI for a JTextField.
*
* @param c the text field
* @return the UI
*/
public static ComponentUI createUI(JComponent c) {
return new BasicTextFieldUI();
}
/**
* Creates a new BasicTextFieldUI.
*/
public BasicTextFieldUI() {
super();
}
/**
* Fetches the name used as a key to lookup properties through the
* UIManager. This is used as a prefix to all the standard
* text properties.
*
* @return the name ("TextField")
*/
protected String getPropertyPrefix() {
return "TextField";
}
/**
* Creates a view (FieldView) based on an element.
*
* @param elem the element
* @return the view
*/
public View create(Element elem) {
Document doc = elem.getDocument();
Object i18nFlag = doc.getProperty("i18n"/*AbstractDocument.I18NProperty*/);
if (Boolean.TRUE.equals(i18nFlag)) {
// To support bidirectional text, we build a more heavyweight
// representation of the field.
String kind = elem.getName();
if (kind != null) {
if (kind.equals(AbstractDocument.ContentElementName)) {
return new GlyphView(elem);
} else if (kind.equals(AbstractDocument.ParagraphElementName)) {
return new I18nFieldView(elem);
}
}
// this shouldn't happen, should probably throw in this case.
}
return new FieldView(elem);
}
/**
* Returns the baseline.
*
* @throws NullPointerException {@inheritDoc}
* @throws IllegalArgumentException {@inheritDoc}
* @see javax.swing.JComponent#getBaseline(int, int)
* @since 1.6
*/
public int getBaseline(JComponent c, int width, int height) {
super.getBaseline(c, width, height);
View rootView = getRootView((JTextComponent)c);
if (rootView.getViewCount() > 0) {
Insets insets = c.getInsets();
height = height - insets.top - insets.bottom;
if (height > 0) {
int baseline = insets.top;
View fieldView = rootView.getView(0);
int vspan = (int)fieldView.getPreferredSpan(View.Y_AXIS);
if (height != vspan) {
int slop = height - vspan;
baseline += slop / 2;
}
if (fieldView instanceof I18nFieldView) {
int fieldBaseline = BasicHTML.getBaseline(
fieldView, width - insets.left - insets.right,
height);
if (fieldBaseline < 0) {
return -1;
}
baseline += fieldBaseline;
}
else {
FontMetrics fm = c.getFontMetrics(c.getFont());
baseline += fm.getAscent();
}
return baseline;
}
}
return -1;
}
/**
* Returns an enum indicating how the baseline of the component
* changes as the size changes.
*
* @throws NullPointerException {@inheritDoc}
* @see javax.swing.JComponent#getBaseline(int, int)
* @since 1.6
*/
public Component.BaselineResizeBehavior getBaselineResizeBehavior(
JComponent c) {
super.getBaselineResizeBehavior(c);
return Component.BaselineResizeBehavior.CENTER_OFFSET;
}
/**
* A field view that support bidirectional text via the
* support provided by ParagraphView.
*/
static class I18nFieldView extends ParagraphView {
I18nFieldView(Element elem) {
super(elem);
}
/**
* Fetch the constraining span to flow against for
* the given child index. There is no limit for
* a field since it scrolls, so this is implemented to
* return <code>Integer.MAX_VALUE</code>.
*/
public int getFlowSpan(int index) {
return Integer.MAX_VALUE;
}
protected void setJustification(int j) {
// Justification is done in adjustAllocation(), so disable
// ParagraphView's justification handling by doing nothing here.
}
static boolean isLeftToRight( java.awt.Component c ) {
return c.getComponentOrientation().isLeftToRight();
}
/**
* 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.
*/
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(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, adjustAllocation(a));
}
/**
* 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 document model coordinate space
* to the coordinate space of the view mapped to it.
*
* @param p0 the position to convert >= 0
* @param b0 the bias toward the previous character or the
* next character represented by p0, in case the
* position is a boundary of two views.
* @param p1 the position to convert >= 0
* @param b1 the bias toward the previous character or the
* next character represented by p1, in case the
* position is a boundary of two views.
* @param a the allocated region to render into
* @return the bounding box of the given position is returned
* @exception BadLocationException if the given position does
* not represent a valid location in the associated document
* @exception IllegalArgumentException for an invalid bias argument
* @see View#viewToModel
*/
public Shape modelToView(int p0, Position.Bias b0,
int p1, Position.Bias b1, Shape a)
throws BadLocationException
{
return super.modelToView(p0, b0, p1, b1, adjustAllocation(a));
}
/**
* Provides a mapping from the view coordinate space to the logical
* coordinate space of the model.
*
* @param fx the X coordinate >= 0.0f
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