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25 
26 package javax.swing.plaf.synth;
27 
28 import javax.swing.*;
29 import javax.swing.text.*;
30 import javax.swing.plaf.*;
31 import javax.swing.plaf.basic.BasicTextAreaUI;
32 import java.awt.*;
33 import java.awt.event.FocusListener;
34 import java.awt.event.FocusEvent;
35 import java.beans.PropertyChangeEvent;
36 
37 /**
38  * Provides the look and feel for a plain text editor in the
39  * Synth look and feel. In this implementation the default UI
40  * is extended to act as a simple view factory.
41  * <p>
42  * <strong>Warning:</strong>
43  * Serialized objects of this class will not be compatible with
44  * future Swing releases. The current serialization support is
45  * appropriate for short term storage or RMI between applications running
46  * the same version of Swing.  As of 1.4, support for long term storage
47  * of all JavaBeans
48  * has been added to the <code>java.beans</code> package.
49  * Please see {@link java.beans.XMLEncoder}.
50  *
51  * @author  Shannon Hickey
52  * @since 1.7
53  */
54 @SuppressWarnings("serial") // Same-version serialization only
55 public class SynthTextAreaUI extends BasicTextAreaUI implements SynthUI {
56     private Handler handler = new Handler();
57     private SynthStyle style;
58     private boolean updateKBAction = true;
59     /**
60      * Creates a UI object for a JTextArea.
61      *
62      * @param ta a text area
63      * @return the UI object
64      */
createUI(JComponent ta)65     public static ComponentUI createUI(JComponent ta) {
66         return new SynthTextAreaUI();
67     }
68 
69     /**
70      * {@inheritDoc}
71      */
72     @Override
installDefaults()73     protected void installDefaults() {
74         // Installs the text cursor on the component
75         super.installDefaults();
76         updateStyle(getComponent(), true);
77         getComponent().addFocusListener(handler);
78     }
79 
80     /**
81      * {@inheritDoc}
82      */
83     @Override
uninstallDefaults()84     protected void uninstallDefaults() {
85         SynthContext context = getContext(getComponent(), ENABLED);
86 
87         getComponent().putClientProperty("caretAspectRatio", null);
88         getComponent().removeFocusListener(handler);
89 
90         style.uninstallDefaults(context);
91         style = null;
92         super.uninstallDefaults();
93     }
94 
updateStyle(JTextComponent comp, boolean updateKBAction)95     private void updateStyle(JTextComponent comp, boolean updateKBAction) {
96         SynthContext context = getContext(comp, ENABLED);
97         SynthStyle oldStyle = style;
98 
99         style = SynthLookAndFeel.updateStyle(context, this);
100 
101         if (style != oldStyle) {
102             SynthTextFieldUI.updateStyle(comp, context, getPropertyPrefix());
103 
104             if (oldStyle != null && updateKBAction) {
105                 uninstallKeyboardActions();
106                 installKeyboardActions();
107             }
108         }
109     }
110 
111     /**
112      * {@inheritDoc}
113      */
114     @Override
getContext(JComponent c)115     public SynthContext getContext(JComponent c) {
116         return getContext(c, SynthLookAndFeel.getComponentState(c));
117     }
118 
getContext(JComponent c, int state)119     private SynthContext getContext(JComponent c, int state) {
120         return SynthContext.getContext(c, style, state);
121     }
122 
123     /**
124      * Notifies this UI delegate to repaint the specified component.
125      * This method paints the component background, then calls
126      * the {@link #paint(SynthContext,Graphics)} method.
127      *
128      * <p>In general, this method does not need to be overridden by subclasses.
129      * All Look and Feel rendering code should reside in the {@code paint} method.
130      *
131      * @param g the {@code Graphics} object used for painting
132      * @param c the component being painted
133      * @see #paint(SynthContext,Graphics)
134      */
135     @Override
update(Graphics g, JComponent c)136     public void update(Graphics g, JComponent c) {
137         SynthContext context = getContext(c);
138 
139         SynthLookAndFeel.update(context, g);
140         context.getPainter().paintTextAreaBackground(context,
141                           g, 0, 0, c.getWidth(), c.getHeight());
142         paint(context, g);
143     }
144 
145     /**
146      * Paints the specified component.
147      *
148      * @param context context for the component being painted
149      * @param g the {@code Graphics} object used for painting
150      * @see #update(Graphics,JComponent)
151      */
paint(SynthContext context, Graphics g)152     protected void paint(SynthContext context, Graphics g) {
153         super.paint(g, getComponent());
154     }
155 
156     /**
157      * {@inheritDoc}
158      *
159      * Overridden to do nothing.
160      */
161     @Override
paintBackground(Graphics g)162     protected void paintBackground(Graphics g) {
163         // Overriden to do nothing, all our painting is done from update/paint.
164     }
165 
166     /**
167      * {@inheritDoc}
168      */
169     @Override
paintBorder(SynthContext context, Graphics g, int x, int y, int w, int h)170     public void paintBorder(SynthContext context, Graphics g, int x,
171                             int y, int w, int h) {
172         context.getPainter().paintTextAreaBorder(context, g, x, y, w, h);
173     }
174 
175     /**
176      * This method gets called when a bound property is changed
177      * on the associated JTextComponent.  This is a hook
178      * which UI implementations may change to reflect how the
179      * UI displays bound properties of JTextComponent subclasses.
180      * This is implemented to rebuild the View when the
181      * <em>WrapLine</em> or the <em>WrapStyleWord</em> property changes.
182      *
183      * @param evt the property change event
184      */
185     @Override
propertyChange(PropertyChangeEvent evt)186     protected void propertyChange(PropertyChangeEvent evt) {
187         if (evt.getPropertyName().equals("keymap")) {
188             if (evt.getNewValue() != null)
189             {
190                 updateKBAction = false;
191             } else {
192                 updateKBAction = true;
193             }
194         }
195         if (SynthLookAndFeel.shouldUpdateStyle(evt)) {
196             updateStyle((JTextComponent)evt.getSource(), updateKBAction);
197         }
198         super.propertyChange(evt);
199     }
200 
201     private final class Handler implements FocusListener {
focusGained(FocusEvent e)202         public void focusGained(FocusEvent e) {
203             getComponent().repaint();
204         }
205 
focusLost(FocusEvent e)206         public void focusLost(FocusEvent e) {
207             getComponent().repaint();
208         }
209     }
210 }
211