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// The MIT License (MIT)
//
// Copyright (c) 2017 Timothy D. Jones
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package io.github.jonestimd.swing.component;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.ItemEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.text.Format;
import javax.swing.text.JTextComponent;
import io.github.jonestimd.swing.validation.Validator;
/**
* An editable combo box that keeps the popup menu visible and updates the menu items when the input text changes.
* Handles the the following keyboard input:
*
*
any key except escape and enter will show the popup menu
*
ctrl-space clears the selection and moves the cursor to the end of the input text
*
*/
public class SuggestField extends BeanListComboBox {
public SuggestField(Format format, Validator validator, SuggestModel model) {
this(format, format, validator, model);
}
public SuggestField(Format format, Format itemFormat, Validator validator, SuggestModel model) {
super(format, itemFormat, validator, model);
getEditorComponent().addKeyListener(new KeyAdapter() {
@Override
public void keyReleased(KeyEvent event) {
SuggestField.this.processEditorKeyEvent(event);
}
});
getEditorComponent().addFocusListener(new FocusListener() {
@Override
public void focusGained(FocusEvent e) {
setPopupVisible(true);
}
@Override
public void focusLost(FocusEvent e) {
moveToEnd();
}
});
addItemListener(event -> {
if (event.getStateChange() == ItemEvent.SELECTED && event.getItem() != null) getModel().updateSuggestions(getEditorText());
});
}
private void moveToEnd() {
JTextComponent editorComponent = getEditorComponent();
int length = editorComponent.getText().length();
editorComponent.setSelectionStart(length);
editorComponent.setSelectionEnd(length);
}
protected void processEditorKeyEvent(KeyEvent event) {
int position = getEditorComponent().getCaretPosition();
int selectionStart = getEditorComponent().getSelectionStart();
int selectionEnd = getEditorComponent().getSelectionEnd();
setSelectedItem(getModel().updateSuggestions(getEditorText()));
if (event.getKeyChar() != KeyEvent.CHAR_UNDEFINED) {
int length = getEditorText().length();
getEditorComponent().setCaretPosition(Math.min(position, length));
getEditorComponent().setSelectionStart(Math.min(selectionStart, length));
getEditorComponent().setSelectionEnd(Math.min(selectionEnd, length));
}
int keyCode = event.getKeyCode();
if (keyCode == KeyEvent.VK_SPACE && event.getModifiersEx() == KeyEvent.CTRL_DOWN_MASK) moveToEnd();
else if (keyCode != KeyEvent.VK_ENTER && keyCode != KeyEvent.VK_ESCAPE && !isPopupVisible()) setPopupVisible(true);
}
@Override
public SuggestModel getModel() {
return (SuggestModel) super.getModel();
}
}