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package com.sun.javafx.scene.control.behavior;

import javafx.event.EventTarget;
import javafx.scene.Node;
import javafx.scene.control.ComboBox;
import javafx.scene.control.ComboBoxBase;
import javafx.scene.control.DatePicker;
import javafx.scene.control.TextField;
import javafx.scene.input.KeyEvent;
import javafx.scene.input.MouseButton;
import javafx.scene.input.MouseEvent;
import java.util.ArrayList;
import java.util.List;
import static javafx.scene.input.KeyCode.DOWN;
import static javafx.scene.input.KeyCode.ENTER;
import static javafx.scene.input.KeyCode.ESCAPE;
import static javafx.scene.input.KeyCode.F4;
import static javafx.scene.input.KeyCode.F10;
import static javafx.scene.input.KeyCode.SPACE;
import static javafx.scene.input.KeyCode.UP;
import static javafx.scene.input.KeyEvent.KEY_PRESSED;
import static javafx.scene.input.KeyEvent.KEY_RELEASED;

public class ComboBoxBaseBehavior<T> extends BehaviorBase<ComboBoxBase<T>> {

    /***************************************************************************
     *                                                                         *
     * Constructors                                                            *
     *                                                                         *
     **************************************************************************/

    private TwoLevelFocusComboBehavior tlFocus;

    /**
     * Used to keep track of the most recent key event. This is used when
     * the event needs to be forwarded to the parent for bubbling up.
     */
    private KeyEvent lastEvent;

    /**
     *
     */
    public ComboBoxBaseBehavior(final ComboBoxBase<T> comboBox, final List<KeyBinding> bindings) {
        super(comboBox, bindings);

        // Only add this if we're on an embedded platform that supports 5-button navigation
        if (com.sun.javafx.scene.control.skin.Utils.isTwoLevelFocus()) {
            tlFocus = new TwoLevelFocusComboBehavior(comboBox); // needs to be last.
        }
    }

    @Override public void dispose() {
        if (tlFocus != null) tlFocus.dispose();
        super.dispose();
    }

    /***************************************************************************
     *                                                                         *
     * Focus change handling                                                   *
     *                                                                         *
     **************************************************************************/

    @Override protected void focusChanged() {
        // If we did have the key down, but are now not focused, then we must
        // disarm the box.
        final ComboBoxBase<T> box = getControl();
        if (keyDown && !box.isFocused()) {
            keyDown = false;
            box.disarm();
        }
    }

    /***************************************************************************
     *                                                                         *
     * Key event handling                                                      *
     *                                                                         *
     **************************************************************************/

    /**
     * Indicates that a keyboard key has been pressed which represents the
     * event (this could be space bar for example). As long as keyDown is true,
     * we are also armed, and will ignore mouse events related to arming.
     * Note this is made package private solely for the sake of testing.
     */
    private boolean keyDown;

    private static final String PRESS_ACTION = "Press";
    private static final String RELEASE_ACTION = "Release";

    protected static final List<KeyBinding> COMBO_BOX_BASE_BINDINGS = new ArrayList<KeyBinding>();
    static {
        COMBO_BOX_BASE_BINDINGS.add(new KeyBinding(F4, KEY_RELEASED, "togglePopup"));
        COMBO_BOX_BASE_BINDINGS.add(new KeyBinding(UP, "togglePopup").alt());
        COMBO_BOX_BASE_BINDINGS.add(new KeyBinding(DOWN, "togglePopup").alt());

        COMBO_BOX_BASE_BINDINGS.add(new KeyBinding(SPACE, KEY_PRESSED, PRESS_ACTION));
        COMBO_BOX_BASE_BINDINGS.add(new KeyBinding(SPACE, KEY_RELEASED, RELEASE_ACTION));

        COMBO_BOX_BASE_BINDINGS.add(new KeyBinding(ENTER, KEY_PRESSED, PRESS_ACTION));
        COMBO_BOX_BASE_BINDINGS.add(new KeyBinding(ENTER, KEY_RELEASED, RELEASE_ACTION));

        // The following keys are forwarded to the parent container
        COMBO_BOX_BASE_BINDINGS.add(new KeyBinding(ESCAPE, "Cancel"));
        COMBO_BOX_BASE_BINDINGS.add(new KeyBinding(F10, "ToParent"));
    }

    @Override protected void callActionForEvent(KeyEvent e) {
        // If popup is shown, KeyEvent causes popup to close
        lastEvent = e;
        showPopupOnMouseRelease = true;
        super.callActionForEvent(e);
    }

    @Override protected void callAction(String name) {
        if (PRESS_ACTION.equals(name)) {
            keyPressed();
        } else if (RELEASE_ACTION.equals(name)) {
            keyReleased();
        } else if ("showPopup".equals(name)) {
            show();
        } else if ("togglePopup".equals(name)) {
            if (getControl().isShowing()) hide();
            else show();
        } else if ("Cancel".equals(name)) {
            cancelEdit(lastEvent);
        } else if ("ToParent".equals(name)) {
            forwardToParent(lastEvent);
        } else {
            super.callAction(name);
        }
    }

    /**
     * This function is invoked when an appropriate keystroke occurs which
     * causes this button to be armed if it is not already armed by a mouse
     * press.
     */
    private void keyPressed() {
        if (com.sun.javafx.scene.control.skin.Utils.isTwoLevelFocus()) {
            show();
            if (tlFocus != null) {
                tlFocus.setExternalFocus(false);
            }
        }
        else {
            if (! getControl().isPressed() && ! getControl().isArmed()) {
                keyDown = true;
                getControl().arm();
            }
        }
    }

    /**
     * Invoked when a valid keystroke release occurs which causes the button
     * to fire if it was armed by a keyPress.
     */
    private void keyReleased() {
        if (!com.sun.javafx.scene.control.skin.Utils.isTwoLevelFocus()) {
            if (keyDown) {
                keyDown = false;
                if (getControl().isArmed()) {
                    getControl().disarm();
                }
            }
        }
    }

    protected void forwardToParent(KeyEvent event) {
        if (getControl().getParent() != null) {
            getControl().getParent().fireEvent(event);
        }
    }

    protected void cancelEdit(KeyEvent event) {
        /**
         * This can be cleaned up if the editor property is moved up
         * to ComboBoxBase.
         */
        ComboBoxBase comboBoxBase = getControl();
        TextField textField = null;
        if (comboBoxBase instanceof DatePicker) {
            textField = ((DatePicker)comboBoxBase).getEditor();
        } else if (comboBoxBase instanceof ComboBox) {
            textField = comboBoxBase.isEditable() ? ((ComboBox)comboBoxBase).getEditor() : null;
        }

        if (textField != null && textField.getTextFormatter() != null) {
            textField.cancelEdit();
        } else {
            forwardToParent(event);
        }
    }

    /**************************************************************************
     *                                                                        *
     * Mouse Events                                                           *
     *                                                                        *
     *************************************************************************/

    @Override public void mousePressed(MouseEvent e) {
        super.mousePressed(e);
        arm(e);
    }

    @Override public void mouseReleased(MouseEvent e) {
        super.mouseReleased(e);

        disarm();

        // The showPopupOnMouseRelease boolean was added to resolve
        // RT-18151: namely, clicking on the comboBox button shouldn't hide,
        // and then immediately show the popup, which was occurring because we
        // can't know whether the popup auto-hide was coming because of a MOUSE_PRESS
        // since PopupWindow calls hide() before it calls onAutoHide().
        if (showPopupOnMouseRelease) {
            show();
        } else {
            showPopupOnMouseRelease = true;
            hide();
        }
    }

    @Override public void mouseEntered(MouseEvent e) {
        super.mouseEntered(e);

        if (!getControl().isEditable()) {
            mouseInsideButton = true;
        } else {
            // This is strongly tied to ComboBoxBaseSkin
            final EventTarget target = e.getTarget();
            mouseInsideButton = (target instanceof Node && "arrow-button".equals(((Node) target).getId()));
        }
        arm();
    }

    @Override public void mouseExited(MouseEvent e) {
        super.mouseExited(e);
        mouseInsideButton = false;
        disarm();
    }

    private void getFocus() {
        if (! getControl().isFocused() && getControl().isFocusTraversable()) {
            getControl().requestFocus();
        }
    }

    private void arm(MouseEvent e) {
        boolean valid = (e.getButton() == MouseButton.PRIMARY &&
            ! (e.isMiddleButtonDown() || e.isSecondaryButtonDown() ||
             e.isShiftDown() || e.isControlDown() || e.isAltDown() || e.isMetaDown()));

        if (! getControl().isArmed() && valid) {
            getControl().arm();
        }
    }

    public void show() {
        if (! getControl().isShowing()) {
            getControl().requestFocus();
            getControl().show();
        }
    }

    public void hide() {
        if (getControl().isShowing()) {
            getControl().hide();
        }
    }

    private boolean showPopupOnMouseRelease = true;
    private boolean mouseInsideButton = false;
    public void onAutoHide() {
        // RT-18151: if the ComboBox button was clicked, and it was this that forced the
        // popup to disappear, we don't want the popup to immediately reappear.
        // If the mouse was not within the comboBox button at the time of the auto-hide occurring,
        // then showPopupOnMouseRelease returns to its default of true; otherwise, it toggles.
        // Note that this logic depends on popup.setAutoHide(true) in ComboBoxPopupControl
        hide();
        showPopupOnMouseRelease = mouseInsideButton ? !showPopupOnMouseRelease : true;
    }

    public void arm() {
        if (getControl().isPressed()) {
            getControl().arm();
        }
    }

    public void disarm() {
        if (! keyDown && getControl().isArmed()) {
            getControl().disarm();
        }
    }

}
