/*

 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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package sun.awt.X11;

import java.awt.*;

import java.awt.peer.*;

import java.awt.event.*;

import sun.util.logging.PlatformLogger;

// FIXME: tab traversal should be disabled when mouse is captured (4816336)

// FIXME: key and mouse events should not be delivered to listeners when the Choice is unfurled.  Must override handleNativeKey/MouseEvent (4816336)

// FIXME: test programmatic add/remove/clear/etc

// FIXME: account for unfurling at the edge of the screen

// Note: can't set x,y on layout(), 'cause moving the top-level to the

// edge of the screen won't call layout().  Just do it on paint, I guess

// TODO: make painting more efficient (i.e. when down arrow is pressed, only two items should need to be repainted.

public class XChoicePeer extends XComponentPeer implements ChoicePeer, ToplevelStateListener {

    private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.X11.XChoicePeer");

    private static final int MAX_UNFURLED_ITEMS = 10;  // Maximum number of

    // items to be displayed

    // at a time in an

    // unfurled Choice

    // Description of these constants in ListHelper

    public final static int TEXT_SPACE = 1;

    public final static int BORDER_WIDTH = 1;

    public final static int ITEM_MARGIN = 1;

    public final static int SCROLLBAR_WIDTH = 15;

    // SHARE THESE!

    private static final Insets focusInsets = new Insets(0,0,0,0);

    static final int WIDGET_OFFSET = 18;

    // Stolen from Tiny

    static final int            TEXT_XPAD = 8;

    static final int            TEXT_YPAD = 6;

    // FIXME: Motif uses a different focus color for the item within

    // the unfurled Choice list and for when the Choice itself is focused and

    // popped up.

    static final Color focusColor = Color.black;

    // TODO: there is a time value that the mouse is held down.  If short

    // enough,  the Choice stays popped down.  If long enough, Choice

    // is furled when the mouse is released

    private boolean unfurled = false;        // Choice list is popped down

    private boolean dragging = false;        // Mouse was pressed and is being

                                             // dragged over the (unfurled)

                                             // Choice

    private boolean mouseInSB = false;       // Mouse is interacting with the

                                             // scrollbar

    private boolean firstPress = false;      // mouse was pressed on

                                             // furled Choice so we

                                             // not need to furl the

                                             // Choice when MOUSE_RELEASED occurred

    // 6425067. Mouse was pressed on furled choice and dropdown list appeared over Choice itself

    // and then there were no mouse movements until MOUSE_RELEASE.

    // This scenario leads to ItemStateChanged as the choice logic uses

    // MouseReleased event to send ItemStateChanged. To prevent it we should

    // use a combination of firstPress and wasDragged variables.

    // The only difference in dragging and wasDragged is: last one will not

    // set to false on mouse ungrab. It become false after MouseRelased() finishes.

    private boolean wasDragged = false;

    private ListHelper helper;

    private UnfurledChoice unfurledChoice;

    // TODO: Choice remembers where it was scrolled to when unfurled - it's not

    // always to the currently selected item.

    // Indicates whether or not to paint selected item in the choice.

    // Default is to paint

    private boolean drawSelectedItem = true;

    // If set, indicates components under which choice popup should be showed.

    // The choice's popup width and location should be adjust to appear

    // under both choice and alignUnder component.

    private Component alignUnder;

    // If cursor is outside of an unfurled Choice when the mouse is

    // released, Choice item should NOT be updated.  Remember the proper index.

    private int dragStartIdx = -1;

    // Holds the listener (XFileDialogPeer) which the processing events from the choice

    // See 6240074 for more information

    private XChoicePeerListener choiceListener;

    XChoicePeer(Choice target) {

        super(target);

    }

    void preInit(XCreateWindowParams params) {

        super.preInit(params);

        Choice target = (Choice)this.target;

        int numItems = target.getItemCount();

        unfurledChoice = new UnfurledChoice(target);

        getToplevelXWindow().addToplevelStateListener(this);

        helper = new ListHelper(unfurledChoice,

                                getGUIcolors(),

                                numItems,

                                false,

                                true,

                                false,

                                target.getFont(),

                                MAX_UNFURLED_ITEMS,

                                TEXT_SPACE,

                                ITEM_MARGIN,

                                BORDER_WIDTH,

                                SCROLLBAR_WIDTH);

    }

    void postInit(XCreateWindowParams params) {

        super.postInit(params);

        Choice target = (Choice)this.target;

        int numItems = target.getItemCount();

        // Add all items

        for (int i = 0; i < numItems; i++) {

            helper.add(target.getItem(i));

        }

        if (!helper.isEmpty()) {

            helper.select(target.getSelectedIndex());

            helper.setFocusedIndex(target.getSelectedIndex());

        }

        helper.updateColors(getGUIcolors());

        updateMotifColors(getPeerBackground());

    }

    public boolean isFocusable() { return true; }

    // 6399679. check if super.setBounds() actually changes the size of the

    // component and then compare current Choice size with a new one. If

    // they differs then hide dropdown menu

    public void setBounds(int x, int y, int width, int height, int op) {

        int oldX = this.x;

        int oldY = this.y;

        int oldWidth = this.width;

        int oldHeight = this.height;

        super.setBounds(x, y, width, height, op);

        if (unfurled && (oldX != this.x || oldY != this.y || oldWidth != this.width || oldHeight != this.height) ) {

            hidePopdownMenu();

        }

    }

    public void focusGained(FocusEvent e) {

        // TODO: only need to paint the focus bit

        super.focusGained(e);

        repaint();

    }

    /*

     * Fix for 6246503 : Disabling a choice after selection locks keyboard, mouse and makes the system unusable, Xtoolkit

     * if setEnabled(false) invoked we should close opened choice in

     * order to prevent keyboard/mouse lock.

     */

    public void setEnabled(boolean value) {

        super.setEnabled(value);

        helper.updateColors(getGUIcolors());

        if (!value && unfurled){

            hidePopdownMenu();

        }

    }

    public void focusLost(FocusEvent e) {

        // TODO: only need to paint the focus bit?

        super.focusLost(e);

        repaint();

    }

    void ungrabInputImpl() {

        if (unfurled) {

            unfurled = false;

            dragging = false;

            mouseInSB = false;

            unfurledChoice.setVisible(false);

        }

        super.ungrabInputImpl();

    }

    void handleJavaKeyEvent(KeyEvent e) {

        if (e.getID() == KeyEvent.KEY_PRESSED) {

            keyPressed(e);

        }

    }

    public void keyPressed(KeyEvent e) {

        switch(e.getKeyCode()) {

            // UP & DOWN are same if furled or unfurled

          case KeyEvent.VK_DOWN:

          case KeyEvent.VK_KP_DOWN: {

              if (helper.getItemCount() > 1) {

                  helper.down();

                  int newIdx = helper.getSelectedIndex();

                  ((Choice)target).select(newIdx);

                  postEvent(new ItemEvent((Choice)target,

                                          ItemEvent.ITEM_STATE_CHANGED,

                                          ((Choice)target).getItem(newIdx),

                                          ItemEvent.SELECTED));

                  repaint();

              }

              break;

          }

          case KeyEvent.VK_UP:

          case KeyEvent.VK_KP_UP: {

              if (helper.getItemCount() > 1) {

                  helper.up();

                  int newIdx = helper.getSelectedIndex();

                  ((Choice)target).select(newIdx);

                  postEvent(new ItemEvent((Choice)target,

                                          ItemEvent.ITEM_STATE_CHANGED,

                                          ((Choice)target).getItem(newIdx),

                                          ItemEvent.SELECTED));

                  repaint();

              }

              break;

          }

          case KeyEvent.VK_PAGE_DOWN:

              if (unfurled && !dragging) {

                  int oldIdx = helper.getSelectedIndex();

                  helper.pageDown();

                  int newIdx = helper.getSelectedIndex();

                  if (oldIdx != newIdx) {

                      ((Choice)target).select(newIdx);

                      postEvent(new ItemEvent((Choice)target,

                                              ItemEvent.ITEM_STATE_CHANGED,

                                              ((Choice)target).getItem(newIdx),

                                              ItemEvent.SELECTED));

                      repaint();

                  }

              }

              break;

          case KeyEvent.VK_PAGE_UP:

              if (unfurled && !dragging) {

                  int oldIdx = helper.getSelectedIndex();

                  helper.pageUp();

                  int newIdx = helper.getSelectedIndex();

                  if (oldIdx != newIdx) {

                      ((Choice)target).select(newIdx);

                      postEvent(new ItemEvent((Choice)target,

                                              ItemEvent.ITEM_STATE_CHANGED,

                                              ((Choice)target).getItem(newIdx),

                                              ItemEvent.SELECTED));

                      repaint();

                  }

              }

              break;

          case KeyEvent.VK_ESCAPE:

          case KeyEvent.VK_ENTER:

              if (unfurled) {

                  if (dragging){

                      if (e.getKeyCode() == KeyEvent.VK_ESCAPE){

                          //This also happens on

                          // - MouseButton2,3, etc. press

                          // - ENTER press

                          helper.select(dragStartIdx);

                      } else { //KeyEvent.VK_ENTER:

                          int newIdx = helper.getSelectedIndex();

                          ((Choice)target).select(newIdx);

                          postEvent(new ItemEvent((Choice)target,

                                                  ItemEvent.ITEM_STATE_CHANGED,

                                                  ((Choice)target).getItem(newIdx),

                                                  ItemEvent.SELECTED));

                      }

                  }

                  hidePopdownMenu();

                  dragging = false;

                  wasDragged = false;

                  mouseInSB = false;

                  // See 6240074 for more information

                  if (choiceListener != null){

                      choiceListener.unfurledChoiceClosing();

                  }

              }

              break;

          default:

              if (unfurled) {

                  Toolkit.getDefaultToolkit().beep();

              }

              break;

        }

    }

    public boolean handlesWheelScrolling() { return true; }

    void handleJavaMouseWheelEvent(MouseWheelEvent e) {

        if (unfurled && helper.isVSBVisible()) {

            if (ListHelper.doWheelScroll(helper.getVSB(), null, e)) {

                repaint();

            }

        }

    }

    void handleJavaMouseEvent(MouseEvent e) {

        super.handleJavaMouseEvent(e);

        int i = e.getID();

        switch (i) {

          case MouseEvent.MOUSE_PRESSED:

              mousePressed(e);

              break;

          case MouseEvent.MOUSE_RELEASED:

              mouseReleased(e);

              break;

          case MouseEvent.MOUSE_DRAGGED:

              mouseDragged(e);

              break;

        }

    }

    public void mousePressed(MouseEvent e) {

        /*

         * fix for 5003166: a Choice on XAWT shouldn't react to any

         * mouse button presses except left. This involves presses on

         * Choice but not on opened part of choice.

         */

        if (e.getButton() == MouseEvent.BUTTON1){

            dragStartIdx = helper.getSelectedIndex();

            if (unfurled) {

                //fix 6259328: PIT: Choice scrolls when dragging the parent frame while drop-down is active, XToolkit

                if (! (isMouseEventInChoice(e) ||

                       unfurledChoice.isMouseEventInside(e)))

                {

                    hidePopdownMenu();

                }

                // Press on unfurled Choice.  Highlight the item under the cursor,

                // but don't send item event or set the text on the button yet

                unfurledChoice.trackMouse(e);

            }

            else {

                // Choice is up - unfurl it

                grabInput();

                unfurledChoice.toFront();

                firstPress = true;

                wasDragged = false;

                unfurled = true;

            }

        }

    }

    /*

     * helper method for mouseReleased routine

     */

    void hidePopdownMenu(){

        ungrabInput();

        unfurledChoice.setVisible(false);

        unfurled = false;

    }

    public void mouseReleased(MouseEvent e) {

        if (unfurled) {

            if (mouseInSB) {

                unfurledChoice.trackMouse(e);

            }

            else {

                // We pressed and dragged onto the Choice, or, this is the

                // second release after clicking to make the Choice "stick"

                // unfurled.

                // This release should ungrab/furl, and set the new item if

                // release was over the unfurled Choice.

                // Fix for 6239944 : Choice shouldn't close its

                // pop-down menu if user presses Mouse on Choice's Scrollbar

                // some additional cases like releasing mouse outside

                // of Choice are considered too

                boolean isMouseEventInside = unfurledChoice.isMouseEventInside( e );

                boolean isMouseInListArea = unfurledChoice.isMouseInListArea( e );

                // Fixed 6318746: REG: File Selection is failing

                // We shouldn't restore the selected item

                // if the mouse was dragged outside the drop-down choice area

                if (!helper.isEmpty() && !isMouseInListArea && dragging) {

                    // Set the selected item back how it was.

                    ((Choice)target).select(dragStartIdx);

                }

                // Choice must be closed if user releases mouse on

                // pop-down menu on the second click

                if ( !firstPress && isMouseInListArea) {

                    hidePopdownMenu();

                }

                // Choice must be closed if user releases mouse

                // outside of Choice's pop-down menu  on the second click

                if ( !firstPress && !isMouseEventInside) {

                    hidePopdownMenu();

                }

                //if user drags Mouse on pop-down menu, Scrollbar or

                // outside the Choice

                if ( firstPress && dragging) {

                    hidePopdownMenu();

                }

                /* this could happen when user has opened a Choice and

                 * released mouse button. Then he drags mouse on the

                 * Scrollbar and releases mouse again.

                 */

                if ( !firstPress && !isMouseInListArea &&

                     isMouseEventInside && dragging)

                {

                    hidePopdownMenu();

                }

                if (!helper.isEmpty()) {

                    // Only update the Choice if the mouse button is released

                    // over the list of items.

                    if (unfurledChoice.isMouseInListArea(e)) {

                        int newIdx = helper.getSelectedIndex();

                        if (newIdx >= 0) {

                            // Update the selected item in the target now that

                            // the mouse selection is complete.

                            if (newIdx != dragStartIdx) {

                                ((Choice)target).select(newIdx);

                                // NOTE: We get a repaint when Choice.select()

                                // calls our peer.select().

                            }

                            if (wasDragged && e.getButton() != MouseEvent.BUTTON1){

                                ((Choice)target).select(dragStartIdx);

                            }

                            /*fix for 6239941 : Choice triggers ItemEvent when selecting an item with right mouse button, Xtoolkit

                            * We should generate ItemEvent if only

                            * LeftMouseButton used */

                            if (e.getButton() == MouseEvent.BUTTON1 &&

                                (!firstPress || wasDragged ))

                            {

                                postEvent(new ItemEvent((Choice)target,

                                                        ItemEvent.ITEM_STATE_CHANGED,

                                                        ((Choice)target).getItem(newIdx),

                                                        ItemEvent.SELECTED));

                            }

                            // see 6240074 for more information

                            if (choiceListener != null) {

                                choiceListener.unfurledChoiceClosing();

                            }

                        }

                    }

                }

                // See 6243382 for more information

                unfurledChoice.trackMouse(e);

            }

        }

        dragging = false;

        wasDragged = false;

        firstPress = false;

        dragStartIdx = -1;

    }

    public void mouseDragged(MouseEvent e) {

        /*

         * fix for 5003166. On Motif user are unable to drag

         * mouse inside opened Choice if he drags the mouse with

         * different from LEFT mouse button ( e.g. RIGHT or MIDDLE).

         * This fix make impossible to drag mouse inside opened choice

         * with other mouse buttons rather then LEFT one.

         */

        if ( e.getModifiers() == MouseEvent.BUTTON1_MASK ){

            dragging = true;

            wasDragged = true;

            unfurledChoice.trackMouse(e);

        }

    }

    // Stolen from TinyChoicePeer

    public Dimension getMinimumSize() {

        // TODO: move this impl into ListHelper?

        FontMetrics fm = getFontMetrics(target.getFont());

        Choice c = (Choice)target;

        int w = 0;

        for (int i = c.countItems() ; i-- > 0 ;) {

            w = Math.max(fm.stringWidth(c.getItem(i)), w);

        }

        return new Dimension(w + TEXT_XPAD + WIDGET_OFFSET,

                             fm.getMaxAscent() + fm.getMaxDescent() + TEXT_YPAD);

    }

    /*

     * Layout the...

     */

    public void layout() {

        /*

          Dimension size = target.getSize();

          Font f = target.getFont();

          FontMetrics fm = target.getFontMetrics(f);

          String text = ((Choice)target).getLabel();

          textRect.height = fm.getHeight();

          checkBoxSize = getChoiceSize(fm);