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# Code for Calendar Widget Example

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    **
    ** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
    **
    ** This file is part of Qt Jambi.
    **
    ** ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
    ** General Public Licensing requirements will be met:
    ** http://www.trolltech.com/products/qt/opensource.html
    **
    ** If you are unsure which license is appropriate for your use, please
    ** review the following information:
    ** http://www.trolltech.com/products/qt/licensing.html or contact the
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    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
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    package com.trolltech.examples;

    import com.trolltech.qt.gui.*;
    import com.trolltech.qt.core.*;

    import java.util.*;

    @QtJambiExample (name = "Calendar Widget")
    public class CalendarWidget extends QWidget {
        private QGroupBox previewGroupBox;
        private QGridLayout previewLayout;
        private QCalendarWidget calendar;

        private QGroupBox generalOptionsGroupBox;
        private QLabel localeLabel;
        private QLabel firstDayLabel;
        private QLabel selectionModeLabel;
        private QLabel horizontalHeaderLabel;
        private QLabel verticalHeaderLabel;
        private QComboBox localeCombo;
        private QComboBox firstDayCombo;
        private QComboBox selectionModeCombo;
        private QCheckBox gridCheckBox;
        private QCheckBox navigationCheckBox;
        private QComboBox horizontalHeaderCombo;
        private QComboBox verticalHeaderCombo;

        private QGroupBox datesGroupBox;
        private QLabel currentDateLabel;
        private QLabel minimumDateLabel;
        private QLabel maximumDateLabel;
        private QDateEdit currentDateEdit;
        private QDateEdit minimumDateEdit;
        private QDateEdit maximumDateEdit;

        private QGroupBox textFormatsGroupBox;
        private QLabel weekdayColorLabel;
        private QLabel weekendColorLabel;
        private QLabel headerTextFormatLabel;
        private QComboBox weekdayColorCombo;
        private QComboBox weekendColorCombo;
        private QComboBox headerTextFormatCombo;

        private QCheckBox firstFridayCheckBox;
        private QCheckBox mayFirstCheckBox;

        public CalendarWidget() {
            createPreviewGroupBox();
            createGeneralOptionsGroupBox();
            createDatesGroupBox();
            createTextFormatsGroupBox();

            QGridLayout layout = new QGridLayout();
            layout.addWidget(previewGroupBox, 0, 0);
            layout.addWidget(generalOptionsGroupBox, 0, 1);
            layout.addWidget(datesGroupBox, 1, 0);
            layout.addWidget(textFormatsGroupBox, 1, 1);
            layout.setSizeConstraint(QLayout.SizeConstraint.SetFixedSize);
            setLayout(layout);

            previewLayout.setRowMinimumHeight(0, calendar.sizeHint().height());
            previewLayout.setColumnMinimumWidth(0, calendar.sizeHint().width());

            setWindowTitle(tr("Calendar Widget"));
        }

        private void localeChanged(int index) {
            calendar.setLocale((QLocale) localeCombo.itemData(index));
        }

        private void firstDayChanged(int index) {
            calendar.setFirstDayOfWeek((Qt.DayOfWeek) firstDayCombo.itemData(index));
        }

        private void selectionModeChanged(int index) {
            calendar.setSelectionMode((QCalendarWidget.SelectionMode) selectionModeCombo.itemData(index));
        }

        private void horizontalHeaderChanged(int index) {
            calendar.setHorizontalHeaderFormat((QCalendarWidget.HorizontalHeaderFormat)
                horizontalHeaderCombo.itemData(index));
        }

        private void verticalHeaderChanged(int index) {
            calendar.setVerticalHeaderFormat((QCalendarWidget.VerticalHeaderFormat)
                verticalHeaderCombo.itemData(index));
        }

        private void selectedDateChanged() {
            currentDateEdit.setDate(calendar.selectedDate());
        }

        private void minimumDateChanged(QDate date) {
            calendar.setMinimumDate(date);
            maximumDateEdit.setDate(calendar.maximumDate());
        }

        private void maximumDateChanged(QDate date) {
            calendar.setMaximumDate(date);
            minimumDateEdit.setDate(calendar.minimumDate());
        }

        private void weekdayFormatChanged() {
            QTextCharFormat format = new QTextCharFormat();

            format.setForeground(new QBrush((QColor) weekdayColorCombo.itemData(weekdayColorCombo.currentIndex())));
            calendar.setWeekdayTextFormat(Qt.DayOfWeek.Monday, format);
            calendar.setWeekdayTextFormat(Qt.DayOfWeek.Tuesday, format);
            calendar.setWeekdayTextFormat(Qt.DayOfWeek.Wednesday, format);
            calendar.setWeekdayTextFormat(Qt.DayOfWeek.Thursday, format);
            calendar.setWeekdayTextFormat(Qt.DayOfWeek.Friday, format);
        }

        private void weekendFormatChanged() {
            QTextCharFormat format = new QTextCharFormat();

            format.setForeground(new QBrush((QColor) weekendColorCombo.itemData(weekendColorCombo.currentIndex())));
            calendar.setWeekdayTextFormat(Qt.DayOfWeek.Saturday, format);
            calendar.setWeekdayTextFormat(Qt.DayOfWeek.Sunday, format);
        }

        private void reformatHeaders() {
            String text = headerTextFormatCombo.currentText();
            QTextCharFormat format = new QTextCharFormat();

            if (text.equals(tr("Bold"))) {
                format.setFontWeight(QFont.Weight.Bold.value());
            } else if (text.equals(tr("Italic"))) {
                format.setFontItalic(true);
            } else if (text.equals(tr("Green"))) {
                format.setForeground(new QBrush(new QColor(Qt.GlobalColor.green)));
            }
            calendar.setHeaderTextFormat(format);
        }

        private void reformatCalendarPage() {
            QTextCharFormat mayFirstFormat = new QTextCharFormat();
            if (mayFirstCheckBox.isChecked())
                mayFirstFormat.setForeground(new QBrush(new QColor(Qt.GlobalColor.red)));

            QTextCharFormat firstFridayFormat = new QTextCharFormat();
            if (firstFridayCheckBox.isChecked())
                firstFridayFormat.setForeground(new QBrush(new QColor(Qt.GlobalColor.blue)));

            QDate date = new QDate(calendar.yearShown(), calendar.monthShown(), 1);

            calendar.setDateTextFormat(new QDate(date.year(), 5, 1), mayFirstFormat);

            date.setDate(date.year(), date.month(), 1);
            while (date.dayOfWeek() != Qt.DayOfWeek.Friday.value())
                date = date.addDays(1);
            calendar.setDateTextFormat(date, firstFridayFormat);
        }

        private void createPreviewGroupBox() {
            previewGroupBox = new QGroupBox(tr("Preview"));

            calendar = new QCalendarWidget();
            calendar.setMinimumDate(new QDate(1900, 1, 1));
            calendar.setMaximumDate(new QDate(3000, 1, 1));
            calendar.setGridVisible(true);

            calendar.currentPageChanged.connect(this, "reformatCalendarPage()");

            previewLayout = new QGridLayout();
            previewLayout.addWidget(calendar, 0, 0, Qt.AlignmentFlag.AlignCenter);
            previewGroupBox.setLayout(previewLayout);

        }

        private void createGeneralOptionsGroupBox() {
            generalOptionsGroupBox = new QGroupBox(tr("General Options"));

            localeCombo = new QComboBox();
            int curLocaleIndex = -1;
            int index = 0;
            for (QLocale.Language lang : QLocale.Language.values()) {
                List<QLocale.Country> countries = QLocale.countriesForLanguage(lang);
                for (int i = 0; i < countries.size(); ++i) {
                    QLocale.Country country = countries.get(i);
                    String label = QLocale.languageToString(lang);
                    label += "/";
                    label += QLocale.countryToString(country);
                    QLocale locale = new QLocale(lang, country);
                    if (this.locale().language() == lang && this.locale().country() == country)
                        curLocaleIndex = index;
                    localeCombo.addItem(label, locale);
                    ++index;
                }
            }
            if (curLocaleIndex != -1)
                localeCombo.setCurrentIndex(curLocaleIndex);
            localeLabel = new QLabel(tr("&Locale"));
            localeLabel.setBuddy(localeCombo);

            firstDayCombo = new QComboBox();
            firstDayCombo.addItem(tr("Sunday"), Qt.DayOfWeek.Sunday);
            firstDayCombo.addItem(tr("Monday"), Qt.DayOfWeek.Monday);
            firstDayCombo.addItem(tr("Tuesday"), Qt.DayOfWeek.Tuesday);
            firstDayCombo.addItem(tr("Wednesday"), Qt.DayOfWeek.Wednesday);
            firstDayCombo.addItem(tr("Thursday"), Qt.DayOfWeek.Thursday);
            firstDayCombo.addItem(tr("Friday"), Qt.DayOfWeek.Friday);
            firstDayCombo.addItem(tr("Saturday"), Qt.DayOfWeek.Saturday);

            firstDayLabel = new QLabel(tr("Wee&k starts on:"));
            firstDayLabel.setBuddy(firstDayCombo);

            selectionModeCombo = new QComboBox();
            selectionModeCombo.addItem(tr("Single selection"),
                                       QCalendarWidget.SelectionMode.SingleSelection);
            selectionModeCombo.addItem(tr("None"), QCalendarWidget.SelectionMode.NoSelection);

            selectionModeLabel = new QLabel(tr("&Selection mode:"));
            selectionModeLabel.setBuddy(selectionModeCombo);

            gridCheckBox = new QCheckBox(tr("&Grid"));
            gridCheckBox.setChecked(calendar.isGridVisible());

            navigationCheckBox = new QCheckBox(tr("&Navigation bar"));
            navigationCheckBox.setChecked(true);

            horizontalHeaderCombo = new QComboBox();
            horizontalHeaderCombo.addItem(tr("Single letter day names"),
                                           QCalendarWidget.HorizontalHeaderFormat.SingleLetterDayNames);
            horizontalHeaderCombo.addItem(tr("Short day names"),
                                           QCalendarWidget.HorizontalHeaderFormat.ShortDayNames);
            horizontalHeaderCombo.addItem(tr("None"),
                                           QCalendarWidget.HorizontalHeaderFormat.NoHorizontalHeader);
            horizontalHeaderCombo.setCurrentIndex(1);

            horizontalHeaderLabel = new QLabel(tr("&Horizontal header:"));
            horizontalHeaderLabel.setBuddy(horizontalHeaderCombo);

            verticalHeaderCombo = new QComboBox();
            verticalHeaderCombo.addItem(tr("ISO week numbers"),
                                         QCalendarWidget.VerticalHeaderFormat.ISOWeekNumbers);
            verticalHeaderCombo.addItem(tr("None"), QCalendarWidget.VerticalHeaderFormat.NoVerticalHeader);

            verticalHeaderLabel = new QLabel(tr("&Vertical header:"));
            verticalHeaderLabel.setBuddy(verticalHeaderCombo);

            localeCombo.currentIndexChanged.connect(this, "localeChanged(int)");
            firstDayCombo.currentIndexChanged.connect(this, "firstDayChanged(int)");
            selectionModeCombo.currentIndexChanged.connect(this, "selectionModeChanged(int)");
            gridCheckBox.toggled.connect(calendar, "setGridVisible(boolean)");
            navigationCheckBox.toggled.connect(calendar, "setNavigationBarVisible(boolean)");
            horizontalHeaderCombo.currentIndexChanged.connect(this, "horizontalHeaderChanged(int)");
            verticalHeaderCombo.currentIndexChanged.connect(this, "verticalHeaderChanged(int)");

            QHBoxLayout checkBoxLayout = new QHBoxLayout();
            checkBoxLayout.addWidget(gridCheckBox);
            checkBoxLayout.addStretch();
            checkBoxLayout.addWidget(navigationCheckBox);

            QGridLayout outerLayout = new QGridLayout();
            outerLayout.addWidget(localeLabel, 0, 0);
            outerLayout.addWidget(localeCombo, 0, 1);
            outerLayout.addWidget(firstDayLabel, 1, 0);
            outerLayout.addWidget(firstDayCombo, 1, 1);
            outerLayout.addWidget(selectionModeLabel, 2, 0);
            outerLayout.addWidget(selectionModeCombo, 2, 1);
            outerLayout.addLayout(checkBoxLayout, 3, 0, 1, 2);
            outerLayout.addWidget(horizontalHeaderLabel, 4, 0);
            outerLayout.addWidget(horizontalHeaderCombo, 4, 1);
            outerLayout.addWidget(verticalHeaderLabel, 5, 0);
            outerLayout.addWidget(verticalHeaderCombo, 5, 1);
            generalOptionsGroupBox.setLayout(outerLayout);

            firstDayChanged(firstDayCombo.currentIndex());
            selectionModeChanged(selectionModeCombo.currentIndex());
            horizontalHeaderChanged(horizontalHeaderCombo.currentIndex());
            verticalHeaderChanged(verticalHeaderCombo.currentIndex());
        }

        private void createDatesGroupBox() {
            datesGroupBox = new QGroupBox(tr("Dates"));

            minimumDateEdit = new QDateEdit();
            minimumDateEdit.setDisplayFormat("MMM d, yyyy");
            minimumDateEdit.setDateRange(calendar.minimumDate(),
                                          calendar.maximumDate());
            minimumDateEdit.setDate(calendar.minimumDate());

            minimumDateLabel = new QLabel(tr("&Minimum Date:"));
            minimumDateLabel.setBuddy(minimumDateEdit);

            currentDateEdit = new QDateEdit();
            currentDateEdit.setDisplayFormat("MMM d, yyyy");
            currentDateEdit.setDate(calendar.selectedDate());
            currentDateEdit.setDateRange(calendar.minimumDate(),
                                          calendar.maximumDate());

            currentDateLabel = new QLabel(tr("&Current Date:"));
            currentDateLabel.setBuddy(currentDateEdit);

            maximumDateEdit = new QDateEdit();
            maximumDateEdit.setDisplayFormat("MMM d, yyyy");
            maximumDateEdit.setDateRange(calendar.minimumDate(),
                                         calendar.maximumDate());
            maximumDateEdit.setDate(calendar.maximumDate());

            maximumDateLabel = new QLabel(tr("Ma&ximum Date:"));
            maximumDateLabel.setBuddy(maximumDateEdit);

            currentDateEdit.dateChanged.connect(calendar, "setSelectedDate(QDate)");
            calendar.selectionChanged.connect(this, "selectedDateChanged()");
            minimumDateEdit.dateChanged.connect(this, "minimumDateChanged(QDate)");
            maximumDateEdit.dateChanged.connect(this, "maximumDateChanged(QDate)");

            QGridLayout dateBoxLayout = new QGridLayout();
            dateBoxLayout.addWidget(currentDateLabel, 1, 0);
            dateBoxLayout.addWidget(currentDateEdit, 1, 1);
            dateBoxLayout.addWidget(minimumDateLabel, 0, 0);
            dateBoxLayout.addWidget(minimumDateEdit, 0, 1);
            dateBoxLayout.addWidget(maximumDateLabel, 2, 0);
            dateBoxLayout.addWidget(maximumDateEdit, 2, 1);
            dateBoxLayout.setRowStretch(3, 1);

            datesGroupBox.setLayout(dateBoxLayout);
        }

        private void createTextFormatsGroupBox() {
            textFormatsGroupBox = new QGroupBox(tr("Text Formats"));

            weekdayColorCombo = createColorComboBox();
            weekdayColorCombo.setCurrentIndex(
                    weekdayColorCombo.findText(tr("Black")));

            weekdayColorLabel = new QLabel(tr("&Weekday color:"));
            weekdayColorLabel.setBuddy(weekdayColorCombo);

            weekendColorCombo = createColorComboBox();
            weekendColorCombo.setCurrentIndex(
                    weekendColorCombo.findText(tr("Red")));

            weekendColorLabel = new QLabel(tr("Week&end color:"));
            weekendColorLabel.setBuddy(weekendColorCombo);

            headerTextFormatCombo = new QComboBox();
            headerTextFormatCombo.addItem(tr("Bold"));
            headerTextFormatCombo.addItem(tr("Italic"));
            headerTextFormatCombo.addItem(tr("Plain"));

            headerTextFormatLabel = new QLabel(tr("&Header text:"));
            headerTextFormatLabel.setBuddy(headerTextFormatCombo);

            firstFridayCheckBox = new QCheckBox(tr("&First Friday in blue"));

            mayFirstCheckBox = new QCheckBox(tr("May &1 in red"));

            weekdayColorCombo.currentIndexChanged.connect(this, "weekdayFormatChanged()");
            weekendColorCombo.currentIndexChanged.connect(this, "weekendFormatChanged()");
            headerTextFormatCombo.currentStringChanged.connect(this, "reformatHeaders()");
            firstFridayCheckBox.toggled.connect(this, "reformatCalendarPage()");
            mayFirstCheckBox.toggled.connect(this, "reformatCalendarPage()");

            QHBoxLayout checkBoxLayout = new QHBoxLayout();
            checkBoxLayout.addWidget(firstFridayCheckBox);
            checkBoxLayout.addStretch();
            checkBoxLayout.addWidget(mayFirstCheckBox);

            QGridLayout outerLayout = new QGridLayout();
            outerLayout.addWidget(weekdayColorLabel, 0, 0);
            outerLayout.addWidget(weekdayColorCombo, 0, 1);
            outerLayout.addWidget(weekendColorLabel, 1, 0);
            outerLayout.addWidget(weekendColorCombo, 1, 1);
            outerLayout.addWidget(headerTextFormatLabel, 2, 0);
            outerLayout.addWidget(headerTextFormatCombo, 2, 1);
            outerLayout.addLayout(checkBoxLayout, 3, 0, 1, 2);
            textFormatsGroupBox.setLayout(outerLayout);

            weekdayFormatChanged();
            weekendFormatChanged();
            reformatHeaders();
            reformatCalendarPage();
        }

        private QComboBox createColorComboBox() {
            QComboBox comboBox = new QComboBox();
            comboBox.addItem(tr("Red"), new QColor(Qt.GlobalColor.red));
            comboBox.addItem(tr("Blue"), new QColor(Qt.GlobalColor.blue));
            comboBox.addItem(tr("Black"), new QColor(Qt.GlobalColor.black));
            comboBox.addItem(tr("Magenta"), new QColor(Qt.GlobalColor.magenta));
            return comboBox;
        }

        public static void main(String args[]) {
            QApplication.initialize(args);

            CalendarWidget widget = new CalendarWidget();
            widget.show();

            QApplication.exec();
        }
    }