lfpport_qte_choicegroup.h

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/*
 *   
 *
 * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program 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.
 * 
 * This program 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 at /legal/license.txt).
 * 
 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 or visit www.sun.com if you need additional
 * information or have any questions.
 * 
 * This source file is specific for Qt-based configurations.
 */

/**
 * @file
 * Qt port of ChoiceGroup.
 */

#ifndef _LFPPORT_QTE_CHOICEGROUP_H_
#define _LFPPORT_QTE_CHOICEGROUP_H_

#include <lfpport_choicegroup.h>
#include "lfpport_qte_item.h"

#include <qvbuttongroup.h>
#include <qlistbox.h>
#include <qpushbutton.h>
#include <qlist.h>
#include "lfpport_qte_patched.h"

/**
 * Constant for an exclusive-choice list or choice group. Its value is
 * defined in the <i>MIDP Specification</i>.
 */
#define EXCLUSIVE 1

/**
 * Constant for a multiple-choice list or choice group. Its value is
 * defined in the <i>MIDP Specification</i>.
 */
#define MULTIPLE  2

/**
 * Constant for an implicit list. Its value is defined in the <i>MIDP
 * 2.0 Specification</i>.
 */
#define IMPLICIT  3

/**
 * Constant for a pop-up choice group. Its value is defined in the
 * <i>MIDP Specification</i>.
 */
#define POPUP     4

/**
 * Constant for requesting the device's default text-wrapping policy
 * for the elements of the list or choice group.  Its value is defined
 * in the <i>MIDP Specification</i>.
 */
#define TEXT_WRAP_DEFAULT 0

/**
 * Constant for requesting text wrapping for for the elements of the
 * list or choice group with content longer than one line.  Its value
 * is defined in the <i>MIDP Specification</i>.
 */
#define TEXT_WRAP_ON      1

/**
 * Constant for requesting that text wrapping not be used for for the
 * elements of the list or choice group with content longer than one
 * line.  Its value is defined in the <i>MIDP Specification</i>.
 */
#define TEXT_WRAP_OFF     2

/**
 * Maximum width to be used for choicegroup image.
 * If image is wider it will be clipped to this width
 */
#define PREF_IMG_WIDTH 12

/**
 * Maximum height to be used for choicegroup image.
 * If image is taller and text occupies less height 
 * image will be clipped to this height.
 */
#define PREF_IMG_HEIGHT 12

/**
 * Shared class for all types of ChoiceGroup's widget.
 */
class Choice : public Item {

  Q_OBJECT 

  public :

    /**
     * Construct a ChoiceGroup widget.
     *
     * @param parent owner form's widget
     * @param label label text
     * @param fitPolicy text wrapping policy
     * @param alwaysVertLayout true if label should always be on
     *		a separated line from the body
     */
    Choice(QWidget *parent, const QString &label, int layout = 0,
	   int fitPolicy = 0, bool alwaysVertLayout = true);

    /**
     * Destruct this widget.
     */
    virtual ~Choice();

    /**
     * Handle user events.
     * Since Qt uses SIGNAL/SLOT to deliver events directly, 
     * this function is not used.
     *
     * @param eventPtr event to handle
     * @return true if no further handling is needed
     */
    virtual jboolean  handleEvent(QEvent *eventPtr);

    /**
     * Insert an element.
     *
     * @param elementNum index of the inserted element
     * @param str text portion
     * @param img image portion
     * @param selected selection state
     * @return status of this call
     */
    virtual MidpError insert(int elementNum, const QString &str, QPixmap* img, 
			     jboolean selected) = 0;

    /**
     * Delete an element.
     *
     * @param elementNum index of the to-be deleted element
     * @param selectedIndex element to select after deletion
     * @return status of this call
     */
    virtual MidpError deleteElement(int elementNum, int selectedIndex) = 0;

    /**
     * Remove all elements.
     * @return status of this call
     */
    virtual MidpError deleteAll() = 0;

    /**
     * Update an element with new text, image and selection state.
     *
     * @param elementNum index of the element
     * @param str new text
     * @param img new image
     * @param selected new selection state
     * @return status of this call
     */
    virtual MidpError set(int elementNum, const QString &str, QPixmap* img, 
			  jboolean selected) = 0;

    /**
     * Set selection state for an element.
     *
     * @param elementNum index of the element
     * @param selected new selection state
     * @return status of this call
     */
    virtual MidpError setSelectedIndex(int elementNum, jboolean selected) = 0;

    /**
     * Get current selected element.
     *
     * @param elementNum return the index of the currently selected element
     * @return status of this call
     */
    virtual MidpError getSelectedIndex(int *elementNum) = 0;

    /**
     * Set selection state for all elements.
     *
     * @param selectedArray array with selection states
     * @param arrayLength size of the array
     * @return status of this call
     */
    virtual MidpError setSelectedFlags(jboolean* selectedArray,
				       int arrayLength) = 0;

    /**
     * Get the selection state of all the elements.
     *
     * @param numSelected return the number of selected elements
     * @param selectedArray array to store returned selection states
     * @param arrayLength size of the array
     * @return status of this call
     */
    virtual MidpError getSelectedFlags(int *numSelected,
				       jboolean* selectedArray,
				       int arrayLength) = 0;

    /**
     * Get the selection state of an element.
     *
     * @param selected return state
     * @param elementNum index of the element
     * @return status of this call
     */
    virtual MidpError isSelected(jboolean *selected, int elementNum) = 0;

    /**
     * Set the text wrapping policy.
     *
     * @param fitPolicy TEXT_WRAP_ON, TEXT_WRAP_OFF or TEXT_WRAP_DEFAULT
     * @return status of this call
     */
    virtual MidpError setFitPolicy(int fitPolicy) = 0;

    /**
     * Set font of an element
     *
     * @param elementNum index of the element
     * @param new font
     * @return status of this call
     */
    virtual MidpError setFont(int elementNum, QFont *font) = 0;

    /**
     * Returns currently set fit policy.
     * @return fitPolicy currently set
     */
    int getFitPolicy();

 protected:
    /**
     * Text wrapping policy.
     * TEXT_WRAP_ON or TEXT_WRAP_OFF.
     */
    int fitPolicy;
};

/**
 * Returns currently set fit policy in Choice
 * @return fitpolicy currently set in Choice
 */
inline int Choice::getFitPolicy() { return fitPolicy; }

//*******************************************************************

/**
 * Widget for choice elements of EXCLUSIVE and MULTIPLE ChoiceGroups.
 * Extend QButton to support text wrapping and image.
 */
class ChoiceButton : public QButton {
  Q_OBJECT

 private:
  /**
   * Whether it is part of an exclusive group.
   */
  bool isExclusive;

  /**
   * Image to show.
   */
  QPixmap *img; 

  /**
   * Size of the image.
   */
  QSize imgSize;

  /**
   * Text wrapping policy.
   */
  int fitPolicy;

 protected:
  /**
   * Override QButton to notify Java peer of new selection.
   *
   * @param keyEvent key event to handle
   */

  void keyPressEvent(QKeyEvent *keyEvent);
  /**
   * Override QButton to notify Java peer of traversal out.
   *
   * @param keyEvent key event to handle
   */
  void keyReleaseEvent(QKeyEvent *keyEvent);

  /**
   * Override QButton to notify Java peer of new selection.
   *
   * @param mouseEvent key event to handle
   */
  void mouseReleaseEvent(QMouseEvent *mouseEvent);

  /**
   * Makes this item have focus, enabling any item-specific commands; in
   * addition, if the given event was caused by a user action, notifies the
   * Java platform of the change in focus.
   *
   * @param event pointer to the device event corresponding to the change in
   *        focus.
   */
  void focusInEvent(QFocusEvent *event);

  /**
   * Override QButton to custom paint wrapped text and image.
   *
   * @param painter painter to use
   */
  void drawButton(QPainter * painter);


 public:
  /**
   * Construct a choice button.
   *
   * @param str text portion
   * @param img image portion
   * @param parent containing choicegroup body widget
   * @param isExclusive whether it's part of an exclusive group
   * @param fitPolicy text wrapping policy
   */
  ChoiceButton(const QString &str, QPixmap* img, QWidget *parent, 
               bool isExclusive, int fitPolicy);

  /**
   * Destruct a Choice Button widget.
   */
  virtual ~ChoiceButton();


  /**
   * A public method to set a button to on or off.
   *
   * @param check whether it should be shown as selected
   */
  void setChecked( bool check ) { setOn( check ); }

  /**
   * Override QButton to calculate size based on its contents.
   *
   * @return size needed to show this button
   */
  QSize sizeHint() const;

  /**
   * Size calculation based on the width available 
   *
   * @param w the width available for this ChoiceButton
   * @return size needed to show this button in the passed in width
   */
  QSize sizeHint(int w) const;

  /**
   * Update this button with new image.
   *
   * @param pixmap new image
   */
  void setImage(QPixmap *pixmap);

 public slots:

  /**
   * Notify Java peer that its selection state has changed.
   *
   */
  void notifyStateChanged();

  /**
   * Change text wrapping policy.
   *
   * @param fitPolicy new policy
   */
  void setFitPolicy(int fitPolicy);

};

//***************************************************************

/**
 * Body widget for MULTIPLE and EXCLUSIVE ChoiceGroup.
 */
class ChoiceButtonBoxBody : public QVButtonGroup {

 public:
  /**
   * Create a body widget.
   *
   * @param parent ChoiceGroup widget
   */
  ChoiceButtonBoxBody(QWidget *parent);

  /**
   * ChoiceButtonBoxBody destructor
   */
  virtual ~ChoiceButtonBoxBody();

  /**
   * Override QButtonGroup to traverse between choice elements.
   *
   * @param key key user pressed
   */
  void moveFocus(int key);

  /** 
   * Override QButtonGroup to return the first choice that is selected.
   *
   * @return first choice selected
   */
  ChoiceButton *selected();

  /**
   * Size calculation based on the width available.
   * 
   * @param w the width available for this ChoiceButtonBoxBody
   * @return the size of the button base on the fixed width
   */
  QSize sizeHint(int w) const;

  /**
   * Override QVButtonGroup to fix width for ChoiceButtons before
   * internal layout happens.
   *
   * @param w the new width of this ChoiceButtonBoxBody
   * @param h the new height of this ChoiceButtonBoxBody
   */
  void resize(int w, int h);

 protected:

  /**
   * Makes this item have focus, enabling any item-specific commands; in
   * addition, if the given event was caused by a user action, notifies the
   * Java platform of the change in focus.
   *
   * @param event pointer to the device event corresponding to the change in
   *        focus.
   */
  void focusInEvent(QFocusEvent *event);
};

/**
 * Body widget for IMPLICIT List.
 */