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| ** Copyright (C) 2017 The Qt Company Ltd. |
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| ** This file is part of the Qt Quick Templates 2 module of the Qt Toolkit. |
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| |
| #include "qquickcheckbox_p.h" |
| #include "qquickabstractbutton_p_p.h" |
| |
| #include <QtGui/qpa/qplatformtheme.h> |
| #include <QtQml/qjsvalue.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| /*! |
| \qmltype CheckBox |
| \inherits AbstractButton |
| //! \instantiates QQuickCheckBox |
| \inqmlmodule QtQuick.Controls |
| \since 5.7 |
| \ingroup qtquickcontrols2-buttons |
| \brief Check button that can be toggled on or off. |
| |
| \image qtquickcontrols2-checkbox.gif |
| |
| CheckBox presents an option button that can be toggled on (checked) or |
| off (unchecked). Check boxes are typically used to select one or more |
| options from a set of options. For larger sets of options, such as those |
| in a list, consider using \l CheckDelegate instead. |
| |
| CheckBox inherits its API from \l AbstractButton. For instance, the |
| state of the checkbox can be set with the \l {AbstractButton::}{checked} property. |
| |
| In addition to the checked and unchecked states, there is a third state: |
| partially checked. The partially checked state can be enabled using the |
| \l tristate property. This state indicates that the regular checked/unchecked |
| state can not be determined; generally because of other states that affect |
| the checkbox. This state is useful when several child nodes are selected |
| in a treeview, for example. |
| |
| \code |
| ColumnLayout { |
| CheckBox { |
| checked: true |
| text: qsTr("First") |
| } |
| CheckBox { |
| text: qsTr("Second") |
| } |
| CheckBox { |
| checked: true |
| text: qsTr("Third") |
| } |
| } |
| \endcode |
| |
| Hierarchical checkbox groups can be managed with a non-exclusive |
| \l ButtonGroup. |
| |
| \image qtquickcontrols2-checkbox-group.png |
| |
| The following example illustrates how the combined check state of |
| children can be bound to the check state of the parent checkbox: |
| |
| \snippet qtquickcontrols2-checkbox-group.qml 1 |
| |
| \sa {Customizing CheckBox}, ButtonGroup, {Button Controls} |
| */ |
| |
| class QQuickCheckBoxPrivate : public QQuickAbstractButtonPrivate |
| { |
| Q_DECLARE_PUBLIC(QQuickCheckBox) |
| |
| public: |
| void setNextCheckState(const QJSValue &callback); |
| |
| bool tristate = false; |
| Qt::CheckState checkState = Qt::Unchecked; |
| QJSValue nextCheckState; |
| }; |
| |
| void QQuickCheckBoxPrivate::setNextCheckState(const QJSValue &callback) |
| { |
| Q_Q(QQuickCheckBox); |
| nextCheckState = callback; |
| emit q->nextCheckStateChanged(); |
| } |
| |
| QQuickCheckBox::QQuickCheckBox(QQuickItem *parent) |
| : QQuickAbstractButton(*(new QQuickCheckBoxPrivate), parent) |
| { |
| setCheckable(true); |
| } |
| |
| /*! |
| \qmlproperty bool QtQuick.Controls::CheckBox::tristate |
| |
| This property holds whether the checkbox is a tri-state checkbox. |
| |
| In the animation below, the first checkbox is tri-state: |
| |
| \image qtquickcontrols2-checkbox-tristate.gif |
| |
| The default is \c false, i.e., the checkbox has only two states. |
| */ |
| bool QQuickCheckBox::isTristate() const |
| { |
| Q_D(const QQuickCheckBox); |
| return d->tristate; |
| } |
| |
| void QQuickCheckBox::setTristate(bool tristate) |
| { |
| Q_D(QQuickCheckBox); |
| if (d->tristate == tristate) |
| return; |
| |
| d->tristate = tristate; |
| emit tristateChanged(); |
| } |
| |
| /*! |
| \qmlproperty enumeration QtQuick.Controls::CheckBox::checkState |
| |
| This property holds the check state of the checkbox. |
| |
| Available states: |
| \value Qt.Unchecked The checkbox is unchecked. |
| \value Qt.PartiallyChecked The checkbox is partially checked. This state is only used when \l tristate is enabled. |
| \value Qt.Checked The checkbox is checked. |
| |
| \sa tristate, {AbstractButton::checked}{checked} |
| */ |
| Qt::CheckState QQuickCheckBox::checkState() const |
| { |
| Q_D(const QQuickCheckBox); |
| return d->checkState; |
| } |
| |
| void QQuickCheckBox::setCheckState(Qt::CheckState state) |
| { |
| Q_D(QQuickCheckBox); |
| if (d->checkState == state) |
| return; |
| |
| bool wasChecked = isChecked(); |
| d->checked = state == Qt::Checked; |
| d->checkState = state; |
| emit checkStateChanged(); |
| if (d->checked != wasChecked) |
| emit checkedChanged(); |
| } |
| |
| QFont QQuickCheckBox::defaultFont() const |
| { |
| return QQuickTheme::font(QQuickTheme::CheckBox); |
| } |
| |
| QPalette QQuickCheckBox::defaultPalette() const |
| { |
| return QQuickTheme::palette(QQuickTheme::CheckBox); |
| } |
| |
| void QQuickCheckBox::buttonChange(ButtonChange change) |
| { |
| if (change == ButtonCheckedChange) |
| setCheckState(isChecked() ? Qt::Checked : Qt::Unchecked); |
| else |
| QQuickAbstractButton::buttonChange(change); |
| } |
| |
| /*! |
| \since QtQuick.Controls 2.4 (Qt 5.11) |
| \qmlproperty function QtQuick.Controls::CheckBox::nextCheckState |
| |
| This property holds a callback function that is called to determine |
| the next check state whenever the checkbox is interactively toggled |
| by the user via touch, mouse, or keyboard. |
| |
| By default, a normal checkbox cycles between \c Qt.Unchecked and |
| \c Qt.Checked states, and a tri-state checkbox cycles between |
| \c Qt.Unchecked, \c Qt.PartiallyChecked, and \c Qt.Checked states. |
| |
| The \c nextCheckState callback function can override the default behavior. |
| The following example implements a tri-state checkbox that can present |
| a partially checked state depending on external conditions, but never |
| cycles to the partially checked state when interactively toggled by |
| the user. |
| |
| \code |
| CheckBox { |
| tristate: true |
| checkState: allChildrenChecked ? Qt.Checked : |
| anyChildChecked ? Qt.PartiallyChecked : Qt.Unchecked |
| |
| nextCheckState: function() { |
| if (checkState === Qt.Checked) |
| return Qt.Unchecked |
| else |
| return Qt.Checked |
| } |
| } |
| \endcode |
| */ |
| void QQuickCheckBox::nextCheckState() |
| { |
| Q_D(QQuickCheckBox); |
| if (d->nextCheckState.isCallable()) |
| setCheckState(static_cast<Qt::CheckState>(d->nextCheckState.call().toInt())); |
| else if (d->tristate) |
| setCheckState(static_cast<Qt::CheckState>((d->checkState + 1) % 3)); |
| else |
| QQuickAbstractButton::nextCheckState(); |
| } |
| |
| QT_END_NAMESPACE |
| |
| #include "moc_qquickcheckbox_p.cpp" |