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<td >Qt 5.12</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td >Calendar Widget Example</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtwidgets-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<ul>
<li class="level1"><a href="#window-class-definition">Window Class Definition</a></li>
<li class="level1"><a href="#window-class-implementation">Window Class Implementation</a></li>
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<h1 class="title">Calendar Widget Example</h1>
<span class="subtitle"></span>
<!-- $$$widgets/calendarwidget-brief -->
<p>The Calendar Widget example shows use of <a href="qcalendarwidget.html">QCalendarWidget</a>.</p>
<!-- @@@widgets/calendarwidget -->
<!-- $$$widgets/calendarwidget-description -->
<div class="descr"> <a name="details"></a>
<div class="border"><p class="centerAlign"><img src="images/calendarwidgetexample.png" alt="" /></p></div><p><a href="qcalendarwidget.html">QCalendarWidget</a> displays one calendar month at a time and lets the user select a date. The calendar consists of four components: a navigation bar that lets the user change the month that is displayed, a grid where each cell represents one day in the month, and two headers that display weekday names and week numbers.</p>
<p>The Calendar Widget example displays a <a href="qcalendarwidget.html">QCalendarWidget</a> and lets the user configure its appearance and behavior using <a href="qcombobox.html">QComboBox</a>es, <a href="qcheckbox.html">QCheckBox</a>es, and <a href="qdateedit.html">QDateEdit</a>s. In addition, the user can influence the formatting of individual dates and headers.</p>
<p>The properties of the <a href="qcalendarwidget.html">QCalendarWidget</a> are summarized in the table below.</p>
<div class="table"><table class="generic">
<thead><tr class="qt-style"><th >Property</th><th >Description</th></tr></thead>
<tr valign="top" class="odd"><td ><a href="qcalendarwidget.html#selectedDate-prop">selectedDate</a></td><td >The currently selected date.</td></tr>
<tr valign="top" class="even"><td ><a href="qcalendarwidget.html#minimumDate-prop">minimumDate</a></td><td >The earliest date that can be selected.</td></tr>
<tr valign="top" class="odd"><td ><a href="qcalendarwidget.html#maximumDate-prop">maximumDate</a></td><td >The latest date that can be selected.</td></tr>
<tr valign="top" class="even"><td ><a href="qcalendarwidget.html#firstDayOfWeek-prop">firstDayOfWeek</a></td><td >The day that is displayed as the first day of the week (usually Sunday or Monday).</td></tr>
<tr valign="top" class="odd"><td ><a href="qcalendarwidget.html#gridVisible-prop">gridVisible</a></td><td >Whether the grid should be shown.</td></tr>
<tr valign="top" class="even"><td ><a href="qcalendarwidget.html#selectionMode-prop">selectionMode</a></td><td >Whether the user can select a date or not.</td></tr>
<tr valign="top" class="odd"><td ><a href="qcalendarwidget.html#horizontalHeaderFormat-prop">horizontalHeaderFormat</a></td><td >The format of the day names in the horizontal header (e.g., "M", "Mon", or "Monday").</td></tr>
<tr valign="top" class="even"><td ><a href="qcalendarwidget.html#verticalHeaderFormat-prop">verticalHeaderFormat</a></td><td >The format of the vertical header.</td></tr>
<tr valign="top" class="odd"><td ><a href="qcalendarwidget.html#navigationBarVisible-prop">navigationBarVisible</a></td><td >Whether the navigation bar at the top of the calendar widget is shown.</td></tr>
</table></div>
<p>The example consists of one class, <code>Window</code>, which creates and lays out the <a href="qcalendarwidget.html">QCalendarWidget</a> and the other widgets that let the user configure the <a href="qcalendarwidget.html">QCalendarWidget</a>.</p>
<a name="window-class-definition"></a>
<h2 id="window-class-definition">Window Class Definition</h2>
<p>Here is the definition of the <code>Window</code> class:</p>
<pre class="cpp">
<span class="keyword">class</span> Window : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span>
{
Q_OBJECT
<span class="keyword">public</span>:
Window();
<span class="keyword">private</span> <span class="keyword">slots</span>:
<span class="type">void</span> localeChanged(<span class="type">int</span> index);
<span class="type">void</span> firstDayChanged(<span class="type">int</span> index);
<span class="type">void</span> selectionModeChanged(<span class="type">int</span> index);
<span class="type">void</span> horizontalHeaderChanged(<span class="type">int</span> index);
<span class="type">void</span> verticalHeaderChanged(<span class="type">int</span> index);
<span class="type">void</span> selectedDateChanged();
<span class="type">void</span> minimumDateChanged(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qdate.html">QDate</a></span> <span class="operator">&</span>date);
<span class="type">void</span> maximumDateChanged(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qdate.html">QDate</a></span> <span class="operator">&</span>date);
<span class="type">void</span> weekdayFormatChanged();
<span class="type">void</span> weekendFormatChanged();
<span class="type">void</span> reformatHeaders();
<span class="type">void</span> reformatCalendarPage();
<span class="keyword">private</span>:
<span class="type">void</span> createPreviewGroupBox();
<span class="type">void</span> createGeneralOptionsGroupBox();
<span class="type">void</span> createDatesGroupBox();
<span class="type">void</span> createTextFormatsGroupBox();
<span class="type"><a href="qcombobox.html">QComboBox</a></span> <span class="operator">*</span>createColorComboBox();
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>previewGroupBox;
<span class="type"><a href="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>previewLayout;
<span class="type"><a href="qcalendarwidget.html">QCalendarWidget</a></span> <span class="operator">*</span>calendar;
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>generalOptionsGroupBox;
<span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>localeLabel;
<span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>firstDayLabel;
...
<span class="type"><a href="qcheckbox.html">QCheckBox</a></span> <span class="operator">*</span>mayFirstCheckBox;
};
</pre>
<p>As is often the case with classes that represent self-contained windows, most of the API is private. We will review the private members as we stumble upon them in the implementation.</p>
<a name="window-class-implementation"></a>
<h2 id="window-class-implementation">Window Class Implementation</h2>
<p>Let's now review the class implementation, starting with the constructor:</p>
<pre class="cpp">
Window<span class="operator">::</span>Window()
{
createPreviewGroupBox();
createGeneralOptionsGroupBox();
createDatesGroupBox();
createTextFormatsGroupBox();
<span class="type"><a href="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>;
layout<span class="operator">-</span><span class="operator">></span>addWidget(previewGroupBox<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(generalOptionsGroupBox<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(datesGroupBox<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(textFormatsGroupBox<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
layout<span class="operator">-</span><span class="operator">></span>setSizeConstraint(<span class="type"><a href="qlayout.html">QLayout</a></span><span class="operator">::</span>SetFixedSize);
setLayout(layout);
previewLayout<span class="operator">-</span><span class="operator">></span>setRowMinimumHeight(<span class="number">0</span><span class="operator">,</span> calendar<span class="operator">-</span><span class="operator">></span>sizeHint()<span class="operator">.</span>height());
previewLayout<span class="operator">-</span><span class="operator">></span>setColumnMinimumWidth(<span class="number">0</span><span class="operator">,</span> calendar<span class="operator">-</span><span class="operator">></span>sizeHint()<span class="operator">.</span>width());
setWindowTitle(tr(<span class="string">"Calendar Widget"</span>));
}
</pre>
<p>We start by creating the four <a href="qgroupbox.html">QGroupBox</a>es and their child widgets (including the <a href="qcalendarwidget.html">QCalendarWidget</a>) using four private <code>create...GroupBox()</code> functions, described below. Then we arrange the group boxes in a <a href="qgridlayout.html">QGridLayout</a>.</p>
<p>We set the grid layout's resize policy to <a href="qlayout.html#SizeConstraint-enum">QLayout::SetFixedSize</a> to prevent the user from resizing the window. In that mode, the window's size is set automatically by <a href="qgridlayout.html">QGridLayout</a> based on the size hints of its contents widgets.</p>
<p>To ensure that the window isn't automatically resized every time we change a property of the <a href="qcalendarwidget.html">QCalendarWidget</a> (for example, hiding the navigation bar, the vertical header, or the grid), we set the minimum height of row 0 and the minimum width of column 0 to the initial size of the <a href="qcalendarwidget.html">QCalendarWidget</a>.</p>
<p>Let's move on to the <code>createPreviewGroupBox()</code> function:</p>
<pre class="cpp">
<span class="type">void</span> Window<span class="operator">::</span>createPreviewGroupBox()
{
previewGroupBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgroupbox.html">QGroupBox</a></span>(tr(<span class="string">"Preview"</span>));
calendar <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcalendarwidget.html">QCalendarWidget</a></span>;
calendar<span class="operator">-</span><span class="operator">></span>setMinimumDate(<span class="type"><a href="../qtcore/qdate.html">QDate</a></span>(<span class="number">1900</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>));
calendar<span class="operator">-</span><span class="operator">></span>setMaximumDate(<span class="type"><a href="../qtcore/qdate.html">QDate</a></span>(<span class="number">3000</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>));
calendar<span class="operator">-</span><span class="operator">></span>setGridVisible(<span class="keyword">true</span>);
connect(calendar<span class="operator">,</span> SIGNAL(currentPageChanged(<span class="type">int</span><span class="operator">,</span><span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(reformatCalendarPage()));
previewLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>;
previewLayout<span class="operator">-</span><span class="operator">></span>addWidget(calendar<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AlignCenter);
previewGroupBox<span class="operator">-</span><span class="operator">></span>setLayout(previewLayout);
}
</pre>
<p>The <b>Preview</b> group box contains only one widget: the <a href="qcalendarwidget.html">QCalendarWidget</a>. We set it up, connect its <a href="qcalendarwidget.html#currentPageChanged">currentPageChanged()</a> signal to our <code>reformatCalendarPage()</code> slot to make sure that every new page gets the formatting specified by the user.</p>
<p>The <code>createGeneralOptionsGroupBox()</code> function is somewhat large and several widgets are set up in the same way. We will look at parts of its implementation here and skip the rest:</p>
<pre class="cpp">
<span class="type">void</span> Window<span class="operator">::</span>createGeneralOptionsGroupBox()
{
generalOptionsGroupBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgroupbox.html">QGroupBox</a></span>(tr(<span class="string">"General Options"</span>));
localeCombo <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcombobox.html">QComboBox</a></span>;
<span class="type">int</span> curLocaleIndex <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
<span class="type">int</span> index <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">for</span> (<span class="type">int</span> _lang <span class="operator">=</span> <span class="type"><a href="../qtcore/qlocale.html">QLocale</a></span><span class="operator">::</span>C; _lang <span class="operator"><</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qlocale.html">QLocale</a></span><span class="operator">::</span>LastLanguage; <span class="operator">+</span><span class="operator">+</span>_lang) {
<span class="type"><a href="../qtcore/qlocale.html">QLocale</a></span><span class="operator">::</span>Language lang <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="../qtcore/qlocale.html">QLocale</a></span><span class="operator">::</span>Language<span class="operator">></span>(_lang);
<span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qlocale.html">QLocale</a></span><span class="operator">::</span>Country<span class="operator">></span> countries <span class="operator">=</span> <span class="type"><a href="../qtcore/qlocale.html">QLocale</a></span><span class="operator">::</span>countriesForLanguage(lang);
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> countries<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="type"><a href="../qtcore/qlocale.html">QLocale</a></span><span class="operator">::</span>Country country <span class="operator">=</span> countries<span class="operator">.</span>at(i);
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> label <span class="operator">=</span> <span class="type"><a href="../qtcore/qlocale.html">QLocale</a></span><span class="operator">::</span>languageToString(lang);
label <span class="operator">+</span><span class="operator">=</span> QLatin1Char(<span class="char">'/'</span>);
label <span class="operator">+</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qlocale.html">QLocale</a></span><span class="operator">::</span>countryToString(country);
<span class="type"><a href="../qtcore/qlocale.html">QLocale</a></span> locale(lang<span class="operator">,</span> country);
<span class="keyword">if</span> (<span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>locale()<span class="operator">.</span>language() <span class="operator">=</span><span class="operator">=</span> lang <span class="operator">&</span><span class="operator">&</span> <span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>locale()<span class="operator">.</span>country() <span class="operator">=</span><span class="operator">=</span> country)
curLocaleIndex <span class="operator">=</span> index;
localeCombo<span class="operator">-</span><span class="operator">></span>addItem(label<span class="operator">,</span> locale);
<span class="operator">+</span><span class="operator">+</span>index;
}
}
<span class="keyword">if</span> (curLocaleIndex <span class="operator">!</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>)
localeCombo<span class="operator">-</span><span class="operator">></span>setCurrentIndex(curLocaleIndex);
localeLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"&Locale"</span>));
localeLabel<span class="operator">-</span><span class="operator">></span>setBuddy(localeCombo);
firstDayCombo <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcombobox.html">QComboBox</a></span>;
firstDayCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Sunday"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Sunday);
firstDayCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Monday"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Monday);
firstDayCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Tuesday"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Tuesday);
firstDayCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Wednesday"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Wednesday);
firstDayCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Thursday"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Thursday);
firstDayCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Friday"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Friday);
firstDayCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Saturday"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Saturday);
firstDayLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"Wee&k starts on:"</span>));
firstDayLabel<span class="operator">-</span><span class="operator">></span>setBuddy(firstDayCombo);
...
</pre>
<p>We start with the setup of the <b>Week starts on</b> combobox. This combobox controls which day should be displayed as the first day of the week.</p>
<p>The <a href="qcombobox.html">QComboBox</a> class lets us attach user data as a <a href="../qtcore/qvariant.html">QVariant</a> to each item. The data can later be retrieved with <a href="qcombobox.html">QComboBox</a>'s <a href="qcombobox.html#itemData">itemData()</a> function. <a href="../qtcore/qvariant.html">QVariant</a> doesn't directly support the <a href="../qtcore/qt.html#DayOfWeek-enum">Qt::DayOfWeek</a> data type, but it supports <code>int</code>, and C++ will happily convert any enum value to <code>int</code>.</p>
<pre class="cpp">
...
connect(localeCombo<span class="operator">,</span> SIGNAL(currentIndexChanged(<span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(localeChanged(<span class="type">int</span>)));
connect(firstDayCombo<span class="operator">,</span> SIGNAL(currentIndexChanged(<span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(firstDayChanged(<span class="type">int</span>)));
connect(selectionModeCombo<span class="operator">,</span> SIGNAL(currentIndexChanged(<span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(selectionModeChanged(<span class="type">int</span>)));
connect(gridCheckBox<span class="operator">,</span> SIGNAL(toggled(bool))<span class="operator">,</span>
calendar<span class="operator">,</span> SLOT(setGridVisible(bool)));
connect(navigationCheckBox<span class="operator">,</span> SIGNAL(toggled(bool))<span class="operator">,</span>
calendar<span class="operator">,</span> SLOT(setNavigationBarVisible(bool)));
connect(horizontalHeaderCombo<span class="operator">,</span> SIGNAL(currentIndexChanged(<span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(horizontalHeaderChanged(<span class="type">int</span>)));
connect(verticalHeaderCombo<span class="operator">,</span> SIGNAL(currentIndexChanged(<span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(verticalHeaderChanged(<span class="type">int</span>)));
...
</pre>
<p>After having created the widgets, we connect the signals and slots. We connect the comboboxes to private slots of <code>Window</code> or to public slots provided by <a href="qcombobox.html">QComboBox</a>.</p>
<pre class="cpp">
...
firstDayChanged(firstDayCombo<span class="operator">-</span><span class="operator">></span>currentIndex());
selectionModeChanged(selectionModeCombo<span class="operator">-</span><span class="operator">></span>currentIndex());
horizontalHeaderChanged(horizontalHeaderCombo<span class="operator">-</span><span class="operator">></span>currentIndex());
verticalHeaderChanged(verticalHeaderCombo<span class="operator">-</span><span class="operator">></span>currentIndex());
}
</pre>
<p>At the end of the function, we call the slots that update the calendar to ensure that the <a href="qcalendarwidget.html">QCalendarWidget</a> is synchronized with the other widgets on startup.</p>
<p>Let's now take a look at the <code>createDatesGroupBox()</code> private function:</p>
<pre class="cpp">
<span class="type">void</span> Window<span class="operator">::</span>createDatesGroupBox()
{
datesGroupBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgroupbox.html">QGroupBox</a></span>(tr(<span class="string">"Dates"</span>));
minimumDateEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qdateedit.html">QDateEdit</a></span>;
minimumDateEdit<span class="operator">-</span><span class="operator">></span>setDisplayFormat(<span class="string">"MMM d yyyy"</span>);
minimumDateEdit<span class="operator">-</span><span class="operator">></span>setDateRange(calendar<span class="operator">-</span><span class="operator">></span>minimumDate()<span class="operator">,</span>
calendar<span class="operator">-</span><span class="operator">></span>maximumDate());
minimumDateEdit<span class="operator">-</span><span class="operator">></span>setDate(calendar<span class="operator">-</span><span class="operator">></span>minimumDate());
minimumDateLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"&Minimum Date:"</span>));
minimumDateLabel<span class="operator">-</span><span class="operator">></span>setBuddy(minimumDateEdit);
currentDateEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qdateedit.html">QDateEdit</a></span>;
currentDateEdit<span class="operator">-</span><span class="operator">></span>setDisplayFormat(<span class="string">"MMM d yyyy"</span>);
currentDateEdit<span class="operator">-</span><span class="operator">></span>setDate(calendar<span class="operator">-</span><span class="operator">></span>selectedDate());
currentDateEdit<span class="operator">-</span><span class="operator">></span>setDateRange(calendar<span class="operator">-</span><span class="operator">></span>minimumDate()<span class="operator">,</span>
calendar<span class="operator">-</span><span class="operator">></span>maximumDate());
currentDateLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"&Current Date:"</span>));
currentDateLabel<span class="operator">-</span><span class="operator">></span>setBuddy(currentDateEdit);
maximumDateEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qdateedit.html">QDateEdit</a></span>;
maximumDateEdit<span class="operator">-</span><span class="operator">></span>setDisplayFormat(<span class="string">"MMM d yyyy"</span>);
maximumDateEdit<span class="operator">-</span><span class="operator">></span>setDateRange(calendar<span class="operator">-</span><span class="operator">></span>minimumDate()<span class="operator">,</span>
calendar<span class="operator">-</span><span class="operator">></span>maximumDate());
maximumDateEdit<span class="operator">-</span><span class="operator">></span>setDate(calendar<span class="operator">-</span><span class="operator">></span>maximumDate());
maximumDateLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"Ma&ximum Date:"</span>));
maximumDateLabel<span class="operator">-</span><span class="operator">></span>setBuddy(maximumDateEdit);
</pre>
<p>In this function, we create the <b>Minimum Date</b>, <b>Maximum Date</b>, and <b>Current Date</b> editor widgets, which control the calendar's minimum, maximum, and selected dates. The calendar's minimum and maximum dates have already been set in <code>createPrivewGroupBox()</code>; we can then set the widgets default values to the calendars values.</p>
<pre class="cpp">
connect(currentDateEdit<span class="operator">,</span> SIGNAL(dateChanged(<span class="type"><a href="../qtcore/qdate.html">QDate</a></span>))<span class="operator">,</span>
calendar<span class="operator">,</span> SLOT(setSelectedDate(<span class="type"><a href="../qtcore/qdate.html">QDate</a></span>)));
connect(calendar<span class="operator">,</span> SIGNAL(selectionChanged())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(selectedDateChanged()));
connect(minimumDateEdit<span class="operator">,</span> SIGNAL(dateChanged(<span class="type"><a href="../qtcore/qdate.html">QDate</a></span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(minimumDateChanged(<span class="type"><a href="../qtcore/qdate.html">QDate</a></span>)));
connect(maximumDateEdit<span class="operator">,</span> SIGNAL(dateChanged(<span class="type"><a href="../qtcore/qdate.html">QDate</a></span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(maximumDateChanged(<span class="type"><a href="../qtcore/qdate.html">QDate</a></span>)));
...
}
</pre>
<p>We connect the <code>currentDateEdit</code>'s <a href="qdatetimeedit.html#dateChanged">dateChanged()</a> signal directly to the calendar's <a href="qcalendarwidget.html#selectedDate-prop">setSelectedDate()</a> slot. When the calendar's selected date changes, either as a result of a user action or programmatically, our <code>selectedDateChanged()</code> slot updates the <b>Current Date</b> editor. We also need to react when the user changes the <b>Minimum Date</b> and <b>Maximum Date</b> editors.</p>
<p>Here is the <code>createTextFormatsGroup()</code> function:</p>
<pre class="cpp">
<span class="type">void</span> Window<span class="operator">::</span>createTextFormatsGroupBox()
{
textFormatsGroupBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgroupbox.html">QGroupBox</a></span>(tr(<span class="string">"Text Formats"</span>));
weekdayColorCombo <span class="operator">=</span> createColorComboBox();
weekdayColorCombo<span class="operator">-</span><span class="operator">></span>setCurrentIndex(
weekdayColorCombo<span class="operator">-</span><span class="operator">></span>findText(tr(<span class="string">"Black"</span>)));
weekdayColorLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"&Weekday color:"</span>));
weekdayColorLabel<span class="operator">-</span><span class="operator">></span>setBuddy(weekdayColorCombo);
weekendColorCombo <span class="operator">=</span> createColorComboBox();
weekendColorCombo<span class="operator">-</span><span class="operator">></span>setCurrentIndex(
weekendColorCombo<span class="operator">-</span><span class="operator">></span>findText(tr(<span class="string">"Red"</span>)));
weekendColorLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"Week&end color:"</span>));
weekendColorLabel<span class="operator">-</span><span class="operator">></span>setBuddy(weekendColorCombo);
</pre>
<p>We set up the <b>Weekday Color</b> and <b>Weekend Color</b> comboboxes using <code>createColorCombo()</code>, which instantiates a <a href="qcombobox.html">QComboBox</a> and populates it with colors ("Red", "Blue", etc.).</p>
<pre class="cpp">
headerTextFormatCombo <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcombobox.html">QComboBox</a></span>;
headerTextFormatCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Bold"</span>));
headerTextFormatCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Italic"</span>));
headerTextFormatCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Plain"</span>));
headerTextFormatLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"&Header text:"</span>));
headerTextFormatLabel<span class="operator">-</span><span class="operator">></span>setBuddy(headerTextFormatCombo);
firstFridayCheckBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcheckbox.html">QCheckBox</a></span>(tr(<span class="string">"&First Friday in blue"</span>));
mayFirstCheckBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcheckbox.html">QCheckBox</a></span>(tr(<span class="string">"May &1 in red"</span>));
</pre>
<p>The <b>Header Text Format</b> combobox lets the user change the text format (bold, italic, or plain) used for horizontal and vertical headers. The <b>First Friday in blue</b> and <b>May 1 in red</b> check box affect the rendering of specific dates.</p>
<pre class="cpp">
connect(weekdayColorCombo<span class="operator">,</span> SIGNAL(currentIndexChanged(<span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(weekdayFormatChanged()));
connect(weekdayColorCombo<span class="operator">,</span> SIGNAL(currentIndexChanged(<span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(reformatCalendarPage()));
connect(weekendColorCombo<span class="operator">,</span> SIGNAL(currentIndexChanged(<span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(weekendFormatChanged()));
connect(weekendColorCombo<span class="operator">,</span> SIGNAL(currentIndexChanged(<span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(reformatCalendarPage()));
connect(headerTextFormatCombo<span class="operator">,</span> SIGNAL(currentIndexChanged(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(reformatHeaders()));
connect(firstFridayCheckBox<span class="operator">,</span> SIGNAL(toggled(bool))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(reformatCalendarPage()));
connect(mayFirstCheckBox<span class="operator">,</span> SIGNAL(toggled(bool))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(reformatCalendarPage()));
</pre>
<p>We connect the check boxes and comboboxes to various private slots. The <b>First Friday in blue</b> and <b>May 1 in red</b> check boxes are both connected to <code>reformatCalendarPage()</code>, which is also called when the calendar switches month.</p>
<pre class="cpp">
...
reformatHeaders();
reformatCalendarPage();
}
</pre>
<p>At the end of <code>createTextFormatsGroupBox()</code>, we call private slots to synchronize the <a href="qcalendarwidget.html">QCalendarWidget</a> with the other widgets.</p>
<p>We're now done reviewing the four <code>create...GroupBox()</code> functions. Let's now take a look at the other private functions and slots.</p>
<pre class="cpp">
<span class="type"><a href="qcombobox.html">QComboBox</a></span> <span class="operator">*</span>Window<span class="operator">::</span>createColorComboBox()
{
<span class="type"><a href="qcombobox.html">QComboBox</a></span> <span class="operator">*</span>comboBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcombobox.html">QComboBox</a></span>;
comboBox<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Red"</span>)<span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>red));
comboBox<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Blue"</span>)<span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>blue));
comboBox<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Black"</span>)<span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black));
comboBox<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Magenta"</span>)<span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>magenta));
<span class="keyword">return</span> comboBox;
}
</pre>
<p>In <code>createColorCombo()</code>, we create a combobox and populate it with standard colors. The second argument to <a href="qcombobox.html#addItem">QComboBox::addItem</a>() is a <a href="../qtcore/qvariant.html">QVariant</a> storing user data (in this case, <a href="../qtgui/qcolor.html">QColor</a> objects).</p>
<p>This function was used to set up the <b>Weekday Color</b> and <b>Weekend Color</b> comboboxes.</p>
<pre class="cpp">
<span class="type">void</span> Window<span class="operator">::</span>firstDayChanged(<span class="type">int</span> index)
{
calendar<span class="operator">-</span><span class="operator">></span>setFirstDayOfWeek(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DayOfWeek(
firstDayCombo<span class="operator">-</span><span class="operator">></span>itemData(index)<span class="operator">.</span>toInt()));
}
</pre>
<p>When the user changes the <b>Week starts on</b> combobox's value, <code>firstDayChanged()</code> is invoked with the index of the combobox's new value. We retrieve the custom data item associated with the new current item using <a href="qcombobox.html#itemData">itemData()</a> and cast it to a <a href="../qtcore/qt.html#DayOfWeek-enum">Qt::DayOfWeek</a>.</p>
<p><code>selectionModeChanged()</code>, <code>horizontalHeaderChanged()</code>, and <code>verticalHeaderChanged()</code> are very similar to <code>firstDayChanged()</code>, so they are omitted.</p>
<pre class="cpp">
<span class="type">void</span> Window<span class="operator">::</span>selectedDateChanged()
{
currentDateEdit<span class="operator">-</span><span class="operator">></span>setDate(calendar<span class="operator">-</span><span class="operator">></span>selectedDate());
}
</pre>
<p>The <code>selectedDateChanged()</code> updates the <b>Current Date</b> editor to reflect the current state of the <a href="qcalendarwidget.html">QCalendarWidget</a>.</p>
<pre class="cpp">
<span class="type">void</span> Window<span class="operator">::</span>minimumDateChanged(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qdate.html">QDate</a></span> <span class="operator">&</span>date)
{
calendar<span class="operator">-</span><span class="operator">></span>setMinimumDate(date);
maximumDateEdit<span class="operator">-</span><span class="operator">></span>setDate(calendar<span class="operator">-</span><span class="operator">></span>maximumDate());
}
</pre>
<p>When the user changes the minimum date, we tell the QCalenderWidget. We also update the <b>Maximum Date</b> editor, because if the new minimum date is later than the current maximum date, <a href="qcalendarwidget.html">QCalendarWidget</a> will automatically adapt its maximum date to avoid a contradicting state.</p>
<pre class="cpp">
<span class="type">void</span> Window<span class="operator">::</span>maximumDateChanged(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qdate.html">QDate</a></span> <span class="operator">&</span>date)
{
calendar<span class="operator">-</span><span class="operator">></span>setMaximumDate(date);
minimumDateEdit<span class="operator">-</span><span class="operator">></span>setDate(calendar<span class="operator">-</span><span class="operator">></span>minimumDate());
}
</pre>
<p><code>maximumDateChanged()</code> is implemented similarly to <code>minimumDateChanged()</code>.</p>
<pre class="cpp">
<span class="type">void</span> Window<span class="operator">::</span>weekdayFormatChanged()
{
<span class="type"><a href="../qtgui/qtextcharformat.html">QTextCharFormat</a></span> format;
format<span class="operator">.</span>setForeground(qvariant_cast<span class="operator"><</span><span class="type"><a href="../qtgui/qcolor.html">QColor</a></span><span class="operator">></span>(
weekdayColorCombo<span class="operator">-</span><span class="operator">></span>itemData(weekdayColorCombo<span class="operator">-</span><span class="operator">></span>currentIndex())));
calendar<span class="operator">-</span><span class="operator">></span>setWeekdayTextFormat(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Monday<span class="operator">,</span> format);
calendar<span class="operator">-</span><span class="operator">></span>setWeekdayTextFormat(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Tuesday<span class="operator">,</span> format);
calendar<span class="operator">-</span><span class="operator">></span>setWeekdayTextFormat(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Wednesday<span class="operator">,</span> format);
calendar<span class="operator">-</span><span class="operator">></span>setWeekdayTextFormat(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Thursday<span class="operator">,</span> format);
calendar<span class="operator">-</span><span class="operator">></span>setWeekdayTextFormat(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Friday<span class="operator">,</span> format);
}
</pre>
<p>Each combobox item has a <a href="../qtgui/qcolor.html">QColor</a> object as user data corresponding to the item's text. After fetching the colors from the comboboxes, we set the text format of each day of the week.</p>
<p>The text format of a column in the calendar is given as a <a href="../qtgui/qtextcharformat.html">QTextCharFormat</a>, which besides the foreground color lets us specify various character formatting information. In this example, we only show a subset of the possibilities.</p>
<pre class="cpp">
<span class="type">void</span> Window<span class="operator">::</span>weekendFormatChanged()
{
<span class="type"><a href="../qtgui/qtextcharformat.html">QTextCharFormat</a></span> format;
format<span class="operator">.</span>setForeground(qvariant_cast<span class="operator"><</span><span class="type"><a href="../qtgui/qcolor.html">QColor</a></span><span class="operator">></span>(
weekendColorCombo<span class="operator">-</span><span class="operator">></span>itemData(weekendColorCombo<span class="operator">-</span><span class="operator">></span>currentIndex())));
calendar<span class="operator">-</span><span class="operator">></span>setWeekdayTextFormat(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Saturday<span class="operator">,</span> format);
calendar<span class="operator">-</span><span class="operator">></span>setWeekdayTextFormat(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Sunday<span class="operator">,</span> format);
}
</pre>
<p><code>weekendFormatChanged()</code> is the same as <code>weekdayFormatChanged()</code>, except that it affects Saturday and Sunday instead of Monday to Friday.</p>
<pre class="cpp">
<span class="type">void</span> Window<span class="operator">::</span>reformatHeaders()
{
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> text <span class="operator">=</span> headerTextFormatCombo<span class="operator">-</span><span class="operator">></span>currentText();
<span class="type"><a href="../qtgui/qtextcharformat.html">QTextCharFormat</a></span> format;
<span class="keyword">if</span> (text <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Bold"</span>)) {
format<span class="operator">.</span>setFontWeight(<span class="type"><a href="../qtgui/qfont.html">QFont</a></span><span class="operator">::</span>Bold);
} <span class="keyword">else</span> <span class="keyword">if</span> (text <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Italic"</span>)) {
format<span class="operator">.</span>setFontItalic(<span class="keyword">true</span>);
} <span class="keyword">else</span> <span class="keyword">if</span> (text <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Green"</span>)) {
format<span class="operator">.</span>setForeground(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>green);
}
calendar<span class="operator">-</span><span class="operator">></span>setHeaderTextFormat(format);
}
</pre>
<p>The <code>reformatHeaders()</code> slot is called when the user changes the text format of the headers. We compare the current text of the <b>Header Text Format</b> combobox to determine which format to apply. (An alternative would have been to store <a href="../qtgui/qtextcharformat.html">QTextCharFormat</a> values alongside the combobox items.)</p>
<pre class="cpp">
<span class="type">void</span> Window<span class="operator">::</span>reformatCalendarPage()
{
<span class="type"><a href="../qtgui/qtextcharformat.html">QTextCharFormat</a></span> mayFirstFormat;
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qdate.html">QDate</a></span> mayFirst(calendar<span class="operator">-</span><span class="operator">></span>yearShown()<span class="operator">,</span> <span class="number">5</span><span class="operator">,</span> <span class="number">1</span>);
<span class="type"><a href="../qtgui/qtextcharformat.html">QTextCharFormat</a></span> firstFridayFormat;
<span class="type"><a href="../qtcore/qdate.html">QDate</a></span> firstFriday(calendar<span class="operator">-</span><span class="operator">></span>yearShown()<span class="operator">,</span> calendar<span class="operator">-</span><span class="operator">></span>monthShown()<span class="operator">,</span> <span class="number">1</span>);
<span class="keyword">while</span> (firstFriday<span class="operator">.</span>dayOfWeek() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Friday)
firstFriday <span class="operator">=</span> firstFriday<span class="operator">.</span>addDays(<span class="number">1</span>);
<span class="keyword">if</span> (firstFridayCheckBox<span class="operator">-</span><span class="operator">></span>isChecked()) {
firstFridayFormat<span class="operator">.</span>setForeground(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>blue);
} <span class="keyword">else</span> { <span class="comment">// Revert to regular colour for this day of the week.</span>
<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DayOfWeek dayOfWeek(<span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DayOfWeek<span class="operator">></span>(firstFriday<span class="operator">.</span>dayOfWeek()));
firstFridayFormat<span class="operator">.</span>setForeground(calendar<span class="operator">-</span><span class="operator">></span>weekdayTextFormat(dayOfWeek)<span class="operator">.</span>foreground());
}
calendar<span class="operator">-</span><span class="operator">></span>setDateTextFormat(firstFriday<span class="operator">,</span> firstFridayFormat);
<span class="comment">// When it is checked, "May First in Red" always takes precedence over "First Friday in Blue".</span>
<span class="keyword">if</span> (mayFirstCheckBox<span class="operator">-</span><span class="operator">></span>isChecked()) {
mayFirstFormat<span class="operator">.</span>setForeground(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>red);
} <span class="keyword">else</span> <span class="keyword">if</span> (<span class="operator">!</span>firstFridayCheckBox<span class="operator">-</span><span class="operator">></span>isChecked() <span class="operator">|</span><span class="operator">|</span> firstFriday <span class="operator">!</span><span class="operator">=</span> mayFirst) {
<span class="comment">// We can now be certain we won't be resetting "May First in Red" when we restore</span>
<span class="comment">// may 1st's regular colour for this day of the week.</span>
<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DayOfWeek dayOfWeek(<span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DayOfWeek<span class="operator">></span>(mayFirst<span class="operator">.</span>dayOfWeek()));
calendar<span class="operator">-</span><span class="operator">></span>setDateTextFormat(mayFirst<span class="operator">,</span> calendar<span class="operator">-</span><span class="operator">></span>weekdayTextFormat(dayOfWeek));
}
calendar<span class="operator">-</span><span class="operator">></span>setDateTextFormat(mayFirst<span class="operator">,</span> mayFirstFormat);
}
</pre>
<p>In <code>reformatCalendarPage()</code>, we set the text format of the first Friday in the month and May 1 in the current year. The text formats that are actually used depend on which check boxes are checked and what the weekday/weekend formats are.</p>
<p><a href="qcalendarwidget.html">QCalendarWidget</a> lets us set the text format of individual dates with the <a href="qcalendarwidget.html#setDateTextFormat">setDateTextFormat()</a>. We chose to set the date formats when the calendar page changes - i.e. a new month is displayed - and when the weekday/weekend format is changed. We check which of the <code>mayFirstCheckBox</code> and <code>firstDayCheckBox</code>, if any, are checked and set the text formats accordingly.</p>
<p>Files:</p>
<ul>
<li><a href="qtwidgets-widgets-calendarwidget-calendarwidget-pro.html">widgets/calendarwidget/calendarwidget.pro</a></li>
<li><a href="qtwidgets-widgets-calendarwidget-main-cpp.html">widgets/calendarwidget/main.cpp</a></li>
<li><a href="qtwidgets-widgets-calendarwidget-window-cpp.html">widgets/calendarwidget/window.cpp</a></li>
<li><a href="qtwidgets-widgets-calendarwidget-window-h.html">widgets/calendarwidget/window.h</a></li>
</ul>
</div>
<!-- @@@widgets/calendarwidget -->
</div>
</div>
</div>
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<p>
<acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.<br/> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property
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distrib
>
Mageia
>
7
>
armv7hl
>
media
>
core-updates
>
by-pkgid
>
b796bb6846bef0871594624de2c980c0
>
files
>
5038
