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<TITLE>Finding a Key Binding in a Component (Java Developers Almanac Example)
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<h3>e862. Finding a Key Binding in a Component</h3>
This example searches all of a component's inputmaps and keymaps
(if the component is a text component) for a particular keystroke.
<pre> FindResult r = find(KeyStroke.getKeyStroke(<font color="#0066ff"><i>"ctrl pressed C"</i></font>), <font color="#0066ff"><i>component</i></font>);
r = find(KeyStroke.getKeyStroke(<font color="#0066ff"><i>"ctrl released C"</i></font>), <font color="#0066ff"><i>component</i></font>);
r = find(KeyStroke.getKeyStroke(<font color="#0066ff"><i>"C"</i></font>), <font color="#0066ff"><i>component</i></font>);
r = find(KeyStroke.getKeyStroke(<font color="#0066ff"><i>"typed C"</i></font>), <font color="#0066ff"><i>component</i></font>);
r = find(KeyStroke.getKeyStroke(<font color="#0066ff"><i>new Character('\u0002')</i></font>, 0), <font color="#0066ff"><i>component</i></font>);
// The results of a find are returned in a FindResult object
static class FindResult {
// Non-null if the keystroke is in an inputmap
InputMap inputMap;
// Non-null if the keystroke is in an keymap or default action
Keymap keymap;
// Non-null if the keystroke is in a default action
// The keymap field holds the keymap containing the default action
Action defaultAction;
// If true, the keystroke is in the component's inputMap or keymap
// and not in one of the inputMap's or keymap's parent.
boolean isLocal;
public String toString() {
StringBuffer b = new StringBuffer();
b.append("inputmap="+inputMap+",keymap="+keymap
+",defaultAction="+defaultAction+",isLocal="+isLocal);
return b.toString();
}
}
// Returns null if not found
public static FindResult find(KeyStroke k, JComponent c) {
FindResult result;
result = find(k, c.getInputMap(JComponent.WHEN_FOCUSED));
if (result != null) {
return result;
}
result = find(k, c.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT));
if (result != null) {
return result;
}
result = find(k, c.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW));
if (result != null) {
return result;
}
// Check keymaps
if (c instanceof JTextComponent) {
JTextComponent tc = (JTextComponent)c;
result = new FindResult();
// Check local keymap
Keymap kmap = tc.getKeymap();
if (kmap.isLocallyDefined(k)) {
result.keymap = kmap;
result.isLocal = true;
return result;
}
// Check parent keymaps
kmap = kmap.getResolveParent();
while (kmap != null) {
if (kmap.isLocallyDefined(k)) {
result.keymap = kmap;
return result;
}
kmap = kmap.getResolveParent();
}
// Look for default action
if (k.getKeyEventType() == KeyEvent.KEY_TYPED) {
// Check local keymap
kmap = tc.getKeymap();
if (kmap.getDefaultAction() != null) {
result.keymap = kmap;
result.defaultAction = kmap.getDefaultAction();
result.isLocal = true;
return result;
}
// Check parent keymaps
kmap = kmap.getResolveParent();
while (kmap != null) {
if (kmap.getDefaultAction() != null) {
result.keymap = kmap;
result.defaultAction = kmap.getDefaultAction();
return result;
}
kmap = kmap.getResolveParent();
}
}
}
return null;
}
public static FindResult find(KeyStroke k, InputMap map) {
// Check local inputmap
KeyStroke[] keys = map.keys();
for (int i=0; keys != null && i<keys.length; i++) {
if (k.equals(keys[i])) {
FindResult result = new FindResult();
result.inputMap = map;
result.isLocal = true;
return result;
}
}
// Check parent inputmap
map = map.getParent();
while (map != null) {
keys = map.keys();
for (int i=0; keys != null && i<keys.length; i++) {
if (k.equals(keys[i])) {
FindResult result = new FindResult();
result.inputMap = map;
return result;
}
}
map = map.getParent();
}
return null;
}
</pre>
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<b>Related Examples</b></font></td>
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</table>
e858. <a class="eglink" href="KeyStrokes.html?l=rel">
Creating a KeyStroke and Binding It to an Action
</a>
<br>
e859. <a class="eglink" href="Key2Str.html?l=rel">
Converting a KeyStroke to a String
</a>
<br>
e860. <a class="eglink" href="ListKeyBinds.html?l=rel">
Listing the Key Bindings in a Component
</a>
<br>
e861. <a class="eglink" href="ShareActions.html?l=rel">
Sharing an InputMap or an ActionMap Between Two Components
</a>
<br>
e863. <a class="eglink" href="ChangeInputMap.html?l=rel">
Adding an InputMap to a Component
</a>
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See also:
<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#Actions">
Actions
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<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#JButton">
JButton
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<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#JCheckBox">
JCheckBox
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JComboBox
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JDesktop and JInternalFrame
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<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#JFrame,%20JWindow,%20JDialog">
JFrame, JWindow, JDialog
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<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#JLabel">
JLabel
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JList
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JProgressBar
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JRadioButton
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JScrollPane
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<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#JSlider">
JSlider
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<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#JSpinner">
JSpinner
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<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#JSplitPane">
JSplitPane
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<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#JTabbedPane">
JTabbedPane
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<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#JToolBar">
JToolBar
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<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#Layout">
Layout
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<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#Look%20and%20Feel">
Look and Feel
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<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#Menus">
Menus
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<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#Progress%20Monitor">
Progress Monitor
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<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#The%20Screen">
The Screen
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<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#Tool%20Tips">
Tool Tips
</a>
<a class="eglink" href="/egs/javax.swing/pkg.html?l=rel#UI%20Default%20Values">
UI Default Values
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