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+@** A Widget for Selecting Date Ranges.
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+
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+\noindent Many of the reports in Typica operate over a range of dates. In these
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+cases it should generally be possible to set that range to any arbitrary start
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+or end, however there are some ranges that are commonly useful where it may be
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+convenient to provide easy access to that range. While Qt provides a widget
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+for selecting a single date, it does not provide a widget that allows two dates
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+to be conveniently selected. One approach which Typica has previously taken is
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+to simply use two |QDateEdit| widgets. This works, however validation that the
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+range is valid must then be performed in every report that uses such an
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+approach. Another down side to this is that changing either side of the date
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+range is either going to result in a database query to obtain results in the
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+new range or another button must be introduced to make setting a new range
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+explicit. One typically wants to adjust both sides of the range at the same
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+time and only have one trip to the database for the new data and increasing the
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+number of controls required for each filter quickly creates a mess.
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+
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+The solution to this is the introduction of a new composite widget for
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+selecting date ranges. The main widget consists of two parts. First there is a
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+|QComboBox| which contains many common date ranges. A |QToolButton| is also
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+provided for convenient one click access to the Custom range. Whether selected
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+from the |QComboBox| or the |QToolButton|, selecting Custom creates a new pop
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+up widget containing two |QCalendarWidget|s and a button to explicitly set the
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+range. This button will not be available unless the selected ending date is not
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+before the selected starting date.
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+
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+As the common use for the selected date is database operations, convenient
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+access to the ISO 8601 string representation of these dates is provided.
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+
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+@(daterangeselector.h@>=
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+
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+#include <QComboBox>
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+
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+#ifndef TypicaDateRangeSelectorHeader
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+#define TypicaDateRangeSelectorHeader
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+
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+class CustomDateRangePopup;
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+
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+class DateRangeSelector : public QWidget
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+{
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+ @[Q_OBJECT@]@;
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+ public:@/
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+ DateRangeSelector(QWidget *parent = NULL);
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+ void setCustomRange(QVariant range);
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+ Q_INVOKABLE QVariant currentRange();@/
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+ @[signals@]:@/
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+ void rangeUpdated(QVariant);
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+ @[private slots@]:@/
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+ void toggleCustom();
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+ void popupHidden();
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+ void updateRange(int index);@/
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+ private:@/
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+ QComboBox *quickSelector;
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+ CustomDateRangePopup *customRangeSelector;
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+ int lastIndex;
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+};
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+
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+#endif
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+
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+@ Implementation details are in a different file.
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+
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+@(daterangeselector.cpp@>=
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+#include <QCalendarWidget>
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+#include <QPushButton>
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+#include <QBoxLayout>
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+#include <QLabel>
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+#include <QToolButton>
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+#include <QApplication>
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+#include <QDesktopWidget>
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+
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+#include "daterangeselector.h"
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+
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+@<CustomDateRangePopup declaration@>
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+@<CustomDateRangePopup implementation@>
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+@<DateRangeSelector implementation@>
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+
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+#include "moc_daterangeselector.cpp"
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+
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+@ The custom range pop up is represented as a separate class which is not to be
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+instantiated except by |DateRangeSelector|.
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+
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+@<CustomDateRangePopup declaration@>=
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+class CustomDateRangePopup : public QWidget
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+{
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+ @[Q_OBJECT@]@;
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+ public:@/
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+ CustomDateRangePopup(QWidget *parent = NULL);@/
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+ @[public slots@]:@/
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+ void applyRange();@/
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+ @[signals@]:@/
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+ void hidingPopup();@/
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+ protected:@/
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+ virtual void hideEvent(QHideEvent *event);@/
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+ @[private slots@]:@/
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+ void validateRange();@/
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+ private:@/
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+ QCalendarWidget *startDateSelector;
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+ QCalendarWidget *endDateSelector;
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+ QPushButton *applyButton;
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+};
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+
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+@ The pop up constructor is responsible for laying out the component widgets,
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+setting the dates selected in each calendar to match the currently selected
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+range, and connecting the appropriate signal handlers.
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+
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+@<CustomDateRangePopup implementation@>=
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+CustomDateRangePopup::CustomDateRangePopup(QWidget *parent) :
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+ QWidget(parent, Qt::Popup), startDateSelector(new QCalendarWidget),
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+ endDateSelector(new QCalendarWidget), applyButton(new QPushButton(tr("Apply")))
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+{
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+ setAttribute(Qt::WA_WindowPropagation);
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+
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+ QVBoxLayout *outerLayout = new QVBoxLayout;
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+ QHBoxLayout *calendarsLayout = new QHBoxLayout;
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+ QVBoxLayout *startDateLayout = new QVBoxLayout;
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+ QVBoxLayout *endDateLayout = new QVBoxLayout;
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+ QHBoxLayout *buttonLayout = new QHBoxLayout;
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+ QLabel *startDateLabel = new QLabel(tr("From"));
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+ QLabel *endDateLabel = new QLabel(tr("To"));
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+ startDateSelector->setVerticalHeaderFormat(QCalendarWidget::NoVerticalHeader);
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+ endDateSelector->setVerticalHeaderFormat(QCalendarWidget::NoVerticalHeader);
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+ DateRangeSelector *selector = qobject_cast<DateRangeSelector *>(parent);
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+ if(parent) {
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+ QStringList range = selector->currentRange().toStringList();
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+ startDateSelector->setSelectedDate(QDate::fromString(range.first(), Qt::ISODate));
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+ endDateSelector->setSelectedDate(QDate::fromString(range.last(), Qt::ISODate));
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+ }
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+ connect(startDateSelector, SIGNAL(selectionChanged()), this, SLOT(validateRange()));
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+ connect(endDateSelector, SIGNAL(selectionChanged()), this, SLOT(validateRange()));
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+
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+ startDateLayout->addWidget(startDateLabel);
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+ startDateLayout->addWidget(startDateSelector);
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+ endDateLayout->addWidget(endDateLabel);
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+ endDateLayout->addWidget(endDateSelector);
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+
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+ connect(applyButton, SIGNAL(clicked()), this, SLOT(applyRange()));
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+
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+ buttonLayout->addStretch();
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+ buttonLayout->addWidget(applyButton);
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+
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+ calendarsLayout->addLayout(startDateLayout);
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+ calendarsLayout->addLayout(endDateLayout);
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+ outerLayout->addLayout(calendarsLayout);
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+ outerLayout->addLayout(buttonLayout);
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+ setLayout(outerLayout);
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+}
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+
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+@ The pop up can be hidden in two ways. Clicking anywhere outside of the widget
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+will hide the pop up. Clicking the Apply button will also hide the pop up. In
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+the former case, we must inform the parent widget that it is fine to destroy
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+the pop up widget, which we do by emitting a signal. Note that clicking outside
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+of the widget will cause the |QHideEvent| to be posted automatically.
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+
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+@<CustomDateRangePopup implementation@>=
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+void CustomDateRangePopup::hideEvent(QHideEvent *)
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+{
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+ emit hidingPopup();
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+}
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+
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+@ Clicking the Apply button requires setting the Custom date range to the
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+currently selected range and then hiding the pop up manually.
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+
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+@<CustomDateRangePopup implementation@>=
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+void CustomDateRangePopup::applyRange()
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+{
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+ DateRangeSelector *selector = qobject_cast<DateRangeSelector *>(parentWidget());
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+ if(selector)
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+ {
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+ selector->setCustomRange(QVariant(QStringList() <<
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+ startDateSelector->selectedDate().toString(Qt::ISODate) <<
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+ endDateSelector->selectedDate().toString(Qt::ISODate)));
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+ }
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+ hide();
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+}
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+
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+@ The Apply button is enabled or disabled depending on if the currently
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+selected dates form a valid range in which the end date does not occur before
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+the start date.
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+
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+@<CustomDateRangePopup implementation@>=
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+void CustomDateRangePopup::validateRange()
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+{
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+ if(startDateSelector->selectedDate() > endDateSelector->selectedDate())
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+ {
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+ applyButton->setEnabled(false);
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+ }
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+ else
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+ {
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+ applyButton->setEnabled(true);
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+ }
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+}
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+
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+@ The |DateRangeSelector| constructor is responsible for setting up the layout
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+of the |QComboBox| and the |QToolButton|, adding appropriate items to the
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+|QComboBox|, and connecting the signals required to handle the pop up
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+correctly.
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+
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+@<DateRangeSelector implementation@>=
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+DateRangeSelector::DateRangeSelector(QWidget *parent) :
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+ QWidget(parent), quickSelector(new QComboBox(this)),
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+ customRangeSelector(NULL), lastIndex(0)
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+{
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+ connect(quickSelector, SIGNAL(currentIndexChanged(int)), this, SLOT(updateRange(int)));
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+
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+ QDate currentDate = QDate::currentDate();
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+
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+ QHBoxLayout *layout = new QHBoxLayout;
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+ @<Set common date ranges to quick selector@>@;
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+ QToolButton *customButton = new QToolButton;
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+ customButton->setIcon(QIcon::fromTheme("office-calendar",
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+ QIcon(":/resources/icons/tango/scalable/apps/office-calendar.svg")));
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+ layout->addWidget(quickSelector);
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+ layout->addWidget(customButton);
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+ setLayout(layout);
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+
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+ connect(customButton, SIGNAL(clicked()), this, SLOT(toggleCustom()));
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+}
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+
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+@ The |QComboBox| provides a mechanism for associating additional data with an
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+item. Several possible representations were considered, but what was ultimately
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+selected was a |QVariant| containing a |QStringList| in which the first entry
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+in the list is the starting date of the range and the last entry in the list is
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+the ending date of the range. Note that the list may contain only one item in
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+cases where the range only covers a single date, however one should not assume
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+that a range covering a single date will only have a single list entry.
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+
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+@<Set common date ranges to quick selector@>=
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+quickSelector->addItem("Yesterday", QVariant(QStringList() <<
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+ currentDate.addDays(-1).toString(Qt::ISODate)));
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+quickSelector->addItem("Today", QVariant(QStringList() <<
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+ currentDate.toString(Qt::ISODate)));
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+quickSelector->insertSeparator(quickSelector->count());
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+quickSelector->addItem("This Week", QVariant(QStringList() <<
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+ (currentDate.dayOfWeek() % 7 ?
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+ currentDate.addDays(-currentDate.dayOfWeek()).toString(Qt::ISODate) :
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+ currentDate.toString(Qt::ISODate)) <<
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+ currentDate.addDays(6 - (currentDate.dayOfWeek() % 7)).toString(Qt::ISODate)));
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+quickSelector->addItem("This Week to Date", currentDate.dayOfWeek() % 7 ?
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+ QVariant(QStringList() <<
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+ currentDate.addDays(-currentDate.dayOfWeek()).toString(Qt::ISODate) <<
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+ currentDate.toString(Qt::ISODate)) :
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+ QVariant(QStringList() << currentDate.toString(Qt::ISODate)));
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+quickSelector->addItem("Last Week", QVariant(QStringList() <<
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+ currentDate.addDays(-(currentDate.dayOfWeek() % 7) - 7).toString(Qt::ISODate) <<
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+ currentDate.addDays(-(currentDate.dayOfWeek() % 7) - 1).toString(Qt::ISODate)));
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+quickSelector->addItem("Last 7 Days", QVariant(QStringList() <<
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+ currentDate.addDays(-6).toString(Qt::ISODate) <<
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+ currentDate.toString(Qt::ISODate)));
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+quickSelector->insertSeparator(quickSelector->count());
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+quickSelector->addItem("This Month", QVariant(QStringList() <<
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+ QDate(currentDate.year(), currentDate.month(), 1).toString(Qt::ISODate) <<
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+ QDate(currentDate.year(), currentDate.month(),
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+ currentDate.daysInMonth()).toString(Qt::ISODate)));
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+quickSelector->addItem("This Month to Date", (currentDate.day() == 1 ?
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+ (QVariant(QStringList() << currentDate.toString(Qt::ISODate))) :
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+ (QVariant(QStringList() <<
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+ QDate(currentDate.year(), currentDate.month(), 1).toString(Qt::ISODate) <<
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+ currentDate.toString(Qt::ISODate)))));
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+quickSelector->addItem("Last Four Weeks", QVariant(QStringList() <<
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+ currentDate.addDays(-27).toString(Qt::ISODate) <<
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+ currentDate.toString(Qt::ISODate)));
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+quickSelector->addItem("Last 30 Days", QVariant(QStringList() <<
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+ currentDate.addDays(-29).toString(Qt::ISODate) <<
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+ currentDate.toString(Qt::ISODate)));
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+quickSelector->insertSeparator(quickSelector->count());
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+quickSelector->addItem("This Quarter", QVariant(QStringList() <<
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+ QDate(currentDate.year(), currentDate.month() - ((currentDate.month() - 1) % 3), 1).toString(Qt::ISODate) <<
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+ (currentDate.month() > 9 ?
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+ QDate(currentDate.year(), 12, 31).toString(Qt::ISODate) :
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+ QDate(currentDate.year(), currentDate.month() - ((currentDate.month() - 1) % 3) + 3, 1).addDays(-1).toString(Qt::ISODate))));
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+quickSelector->addItem("This Quarter to Date",
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+ (currentDate.day() == 1 && (currentDate.month() - 1) % 3 == 0) ?
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+ QVariant(QStringList() << currentDate.toString(Qt::ISODate)) :
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+ QVariant(QStringList() <<
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+ QDate(currentDate.year(), currentDate.month() - ((currentDate.month() - 1) % 3), 1).toString(Qt::ISODate) <<
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+ currentDate.toString(Qt::ISODate)));
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+quickSelector->addItem("Last Quarter", currentDate.month() < 4 ?
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+ QVariant(QStringList() <<
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+ QDate(currentDate.year() - 1, 10, 1).toString(Qt::ISODate) <<
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+ QDate(currentDate.year() - 1, 12, 31).toString(Qt::ISODate)) :
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+ QVariant(QStringList() <<
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+ QDate(currentDate.year(), currentDate.month() - ((currentDate.month() - 1) % 3) - 3, 1).toString(Qt::ISODate) <<
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+ QDate(currentDate.year(), currentDate.month() - ((currentDate.month() - 1) % 3), 1).addDays(-1).toString(Qt::ISODate)));
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+quickSelector->addItem("Last 90 Days", QVariant(QStringList() <<
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+ currentDate.addDays(-89).toString(Qt::ISODate) <<
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+ currentDate.toString(Qt::ISODate)));
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+quickSelector->insertSeparator(quickSelector->count());
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+quickSelector->addItem("This Year", QVariant(QStringList() <<
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+ QDate(currentDate.year(), 1, 1).toString(Qt::ISODate) <<
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+ QDate(currentDate.year(), 12, 31).toString(Qt::ISODate)));
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+quickSelector->addItem("This Year to Date", (currentDate.dayOfYear() == 1) ?
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+ QVariant(QStringList() << currentDate.toString(Qt::ISODate)) :
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+ QVariant(QStringList() << QDate(currentDate.year(), 1, 1).toString(Qt::ISODate) <<
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+ currentDate.toString(Qt::ISODate)));
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+quickSelector->addItem("Last Year", QVariant(QStringList() <<
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+ QDate(currentDate.year() - 1, 1, 1).toString(Qt::ISODate) <<
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+ QDate(currentDate.year() - 1, 12, 31).toString(Qt::ISODate)));
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+quickSelector->addItem("Last 365 Days", QVariant(QStringList() <<
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+ currentDate.addDays(-364).toString(Qt::ISODate) <<
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+ currentDate.toString(Qt::ISODate)));
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+quickSelector->insertSeparator(quickSelector->count());
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+quickSelector->addItem("Custom");
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+
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+@ Special handling of the Custom range is required because it is possible to
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+select this from the |QComboBox| and then not set a range. This should result
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+in the selection changing back to the most recent valid selection. Creating the
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+pop up in this way is handled in |updateRange()|.
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+
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+@<DateRangeSelector implementation@>=
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+void DateRangeSelector::updateRange(int index)
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+{
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312
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+ if(index != lastIndex && index == quickSelector->count() - 1)
|
|
313
|
+ {
|
|
314
|
+ toggleCustom();
|
|
315
|
+ }
|
|
316
|
+ else
|
|
317
|
+ {
|
|
318
|
+ lastIndex = index;
|
|
319
|
+ emit rangeUpdated(quickSelector->itemData(quickSelector->currentIndex()));
|
|
320
|
+ }
|
|
321
|
+}
|
|
322
|
+
|
|
323
|
+@ Resetting the range to the most recent valid selection is handled in
|
|
324
|
+|popupHidden()|.
|
|
325
|
+
|
|
326
|
+@<DateRangeSelector implementation@>=
|
|
327
|
+void DateRangeSelector::popupHidden()
|
|
328
|
+{
|
|
329
|
+ customRangeSelector->deleteLater();
|
|
330
|
+ customRangeSelector = NULL;
|
|
331
|
+ quickSelector->setCurrentIndex(lastIndex);
|
|
332
|
+}
|
|
333
|
+
|
|
334
|
+@ If Custom is set to a new valid range, |lastIndex| will have been set to
|
|
335
|
+point to the appropriate item by a call to |setCustomRange()|.
|
|
336
|
+
|
|
337
|
+@<DateRangeSelector implementation@>=
|
|
338
|
+void DateRangeSelector::setCustomRange(QVariant range)
|
|
339
|
+{
|
|
340
|
+ quickSelector->setItemData(quickSelector->count() - 1, range);
|
|
341
|
+ emit rangeUpdated(range);
|
|
342
|
+ lastIndex = quickSelector->count() - 1;
|
|
343
|
+ quickSelector->setCurrentIndex(lastIndex);
|
|
344
|
+}
|
|
345
|
+
|
|
346
|
+@ When creating the pop up, it should ideally be placed such that the left of
|
|
347
|
+the pop up is aligned with the left of the widget that is normally shown and
|
|
348
|
+immediately under it, however if this would result in part of the pop up not
|
|
349
|
+fitting on the same screen, it should be moved to make a best effort at full
|
|
350
|
+visibility.
|
|
351
|
+
|
|
352
|
+@<DateRangeSelector implementation@>=
|
|
353
|
+void DateRangeSelector::toggleCustom()
|
|
354
|
+{
|
|
355
|
+ if(!customRangeSelector) {
|
|
356
|
+ customRangeSelector = new CustomDateRangePopup(this);
|
|
357
|
+ QPoint pos = rect().bottomLeft();
|
|
358
|
+ QPoint pos2 = rect().topLeft();
|
|
359
|
+ pos = mapToGlobal(pos);
|
|
360
|
+ pos2 = mapToGlobal(pos2);
|
|
361
|
+ QSize size = customRangeSelector->sizeHint();
|
|
362
|
+ QRect screen = QApplication::desktop()->availableGeometry(pos);
|
|
363
|
+ if(pos.x()+size.width() > screen.right()) {
|
|
364
|
+ pos.setX(screen.right()-size.width());
|
|
365
|
+ }
|
|
366
|
+ pos.setX(qMax(pos.x(), screen.left()));
|
|
367
|
+ if(pos.y() + size.height() > screen.bottom()) {
|
|
368
|
+ pos.setY(pos2.y() - size.height());
|
|
369
|
+ } else if (pos.y() < screen.top()){
|
|
370
|
+ pos.setY(screen.top());
|
|
371
|
+ }
|
|
372
|
+ if(pos.y() < screen.top()) {
|
|
373
|
+ pos.setY(screen.top());
|
|
374
|
+ }
|
|
375
|
+ if(pos.y()+size.height() > screen.bottom()) {
|
|
376
|
+ pos.setY(screen.bottom()-size.height());
|
|
377
|
+ }
|
|
378
|
+ customRangeSelector->move(pos);
|
|
379
|
+ customRangeSelector->show();
|
|
380
|
+ connect(customRangeSelector, SIGNAL(hidingPopup()),
|
|
381
|
+ this, SLOT(popupHidden()));
|
|
382
|
+ }
|
|
383
|
+ else
|
|
384
|
+ {
|
|
385
|
+ customRangeSelector->close();
|
|
386
|
+ customRangeSelector->deleteLater();
|
|
387
|
+ customRangeSelector = NULL;
|
|
388
|
+ }
|
|
389
|
+}
|
|
390
|
+
|
|
391
|
+@ While a signal is emitted when the selected range changes, it is frequently
|
|
392
|
+convenient to have a way to request the currently selected range at any time.
|
|
393
|
+
|
|
394
|
+@<DateRangeSelector implementation@>=
|
|
395
|
+QVariant DateRangeSelector::currentRange()
|
|
396
|
+{
|
|
397
|
+ return quickSelector->itemData(lastIndex);
|
|
398
|
+}
|
|
399
|
+
|
|
400
|
+@ To use this new control in Typica, we should provide a way to create it from
|
|
401
|
+the XML description of a window.
|
|
402
|
+
|
|
403
|
+@<Additional box layout elements@>=
|
|
404
|
+else if(currentElement.tagName() == "daterange")
|
|
405
|
+{
|
|
406
|
+ addDateRangeToLayout(currentElement, widgetStack, layoutStack);
|
|
407
|
+}
|
|
408
|
+
|
|
409
|
+@ The method for adding a date range selector to a layout is currently trivial.
|
|
410
|
+Additional features may be added to this in the future to provide better
|
|
411
|
+support for specifying an initial default selection. At present the only
|
|
412
|
+supported attribute is the |"id"| attribute which is used to make the widget
|
|
413
|
+accessible to scripts.
|
|
414
|
+
|
|
415
|
+@<Functions for scripting@>=
|
|
416
|
+void addDateRangeToLayout(QDomElement element, QStack<QWidget *> *,@|
|
|
417
|
+ QStack<QLayout *> *layoutStack)
|
|
418
|
+{
|
|
419
|
+ DateRangeSelector *widget = new DateRangeSelector;
|
|
420
|
+ if(element.hasAttribute("id"))
|
|
421
|
+ {
|
|
422
|
+ widget->setObjectName(element.attribute("id"));
|
|
423
|
+ }
|
|
424
|
+ QBoxLayout *layout = qobject_cast<QBoxLayout *>(layoutStack->top());
|
|
425
|
+ layout->addWidget(widget);
|
|
426
|
+}
|
|
427
|
+
|
|
428
|
+@ The prototype needs to be specified.
|
|
429
|
+
|
|
430
|
+@<Function prototypes for scripting@>=
|
|
431
|
+void addDateRangeToLayout(QDomElement element,
|
|
432
|
+ QStack<QWidget *> *widgetStack,
|
|
433
|
+ QStack<QLayout *> *layoutStack);
|
|
434
|
+
|
|
435
|
+@ Our header is also required.
|
|
436
|
+
|
|
437
|
+@<Header files to include@>=
|
|
438
|
+#include "daterangeselector.h"
|