/**
* Removes an item from the combo box at a particular index
*
* @param index Index of the item to remove
* @return Itself
* @throws IndexOutOfBoundsException if the index is out of range
*/
public synchronized ComboBox<V> remoteItem(int index) {
items.remove(index);
if (index < selectedIndex) {
setSelectedIndex(selectedIndex - 1);
} else if (index == selectedIndex) {
setSelectedIndex(-1);
}
invalidate();
return this;
}
/**
* Adds a new item to the combo box, at a specific index
*
* @param index Index to add the item at
* @param item Item to add
* @return Itself
*/
public synchronized ComboBox<V> addItem(int index, V item) {
if (item == null) {
throw new IllegalArgumentException("Cannot add null elements to a ComboBox");
}
items.add(index, item);
if (index <= selectedIndex) {
setSelectedIndex(selectedIndex + 1);
}
invalidate();
return this;
}
/**
* Adds a new item to the combo box, at the end
*
* @param item Item to add to the combo box
* @return Itself
*/
public synchronized ComboBox<V> addItem(V item) {
if (item == null) {
throw new IllegalArgumentException("Cannot add null elements to a ComboBox");
}
items.add(item);
if (selectedIndex == -1 && items.size() == 1) {
setSelectedIndex(0);
}
invalidate();
return this;
}
private Result handleEditableCBKeyStroke(KeyStroke keyStroke) {
// First check if we are in drop-down focused mode, treat keystrokes a bit differently then
if (isDropDownFocused()) {
switch (keyStroke.getKeyType()) {
case ReverseTab:
case ArrowLeft:
dropDownFocused = false;
textInputPosition = text.length();
return Result.HANDLED;
// The rest we can process in the same way as with read-only combo boxes when we are in
// drop-down focused mode
default:
return handleReadOnlyCBKeyStroke(keyStroke);
}
}
switch (keyStroke.getKeyType()) {
case Character:
text =
text.substring(0, textInputPosition)
+ keyStroke.getCharacter()
+ text.substring(textInputPosition);
textInputPosition++;
return Result.HANDLED;
case Tab:
dropDownFocused = true;
return Result.HANDLED;
case Backspace:
if (textInputPosition > 0) {
text = text.substring(0, textInputPosition - 1) + text.substring(textInputPosition);
textInputPosition--;
}
return Result.HANDLED;
case Delete:
if (textInputPosition < text.length()) {
text = text.substring(0, textInputPosition) + text.substring(textInputPosition + 1);
}
return Result.HANDLED;
case ArrowLeft:
if (textInputPosition > 0) {
textInputPosition--;
} else {
return Result.MOVE_FOCUS_LEFT;
}
return Result.HANDLED;
case ArrowRight:
if (textInputPosition < text.length()) {
textInputPosition++;
} else {
dropDownFocused = true;
return Result.HANDLED;
}
return Result.HANDLED;
case ArrowDown:
if (selectedIndex < items.size() - 1) {
setSelectedIndex(selectedIndex + 1);
}
return Result.HANDLED;
case ArrowUp:
if (selectedIndex > 0) {
setSelectedIndex(selectedIndex - 1);
}
return Result.HANDLED;
default:
}
return super.handleKeyStroke(keyStroke);
}
/**
* Removes all items from the combo box
*
* @return Itself
*/
public synchronized ComboBox<V> clearItems() {
items.clear();
setSelectedIndex(-1);
invalidate();
return this;
}