path: root/src/templates/qquickabstractbutton.cpp

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**
** Copyright (C) 2015 The Qt Company Ltd.
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** This file is part of the Qt Labs Templates module of the Qt Toolkit.
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****************************************************************************/

#include "qquickabstractbutton_p.h"
#include "qquickabstractbutton_p_p.h"

#include <QtQuick/private/qquickevents_p_p.h>

QT_BEGIN_NAMESPACE

/*!
    \qmltype AbstractButton
    \inherits Control
    \instantiates QQuickAbstractButton
    \inqmlmodule Qt.labs.controls
    \qmlabstract
    \internal
*/

/*!
    \qmlsignal Qt.labs.controls::AbstractButton::pressed(MouseEvent mouse)

    This signal is emitted when the button is interactively pressed by the user.

    The mouse parameter provides information about the press, including the x
    and y position and which button was pressed.
*/

/*!
    \qmlsignal Qt.labs.controls::AbstractButton::released(MouseEvent mouse)

    This signal is emitted when the button is interactively released by the user.

    The mouse parameter provides information about the click, including the x
    and y position of the release of the click, and whether the click was held.
*/

/*!
    \qmlsignal Qt.labs.controls::AbstractButton::canceled()

    This signal is emitted when the button loses mouse grab
    while being pressed, or when it would emit the \l released
    signal but the mouse cursor is not inside the button.
*/

/*!
    \qmlsignal Qt.labs.controls::AbstractButton::clicked(MouseEvent mouse)

    This signal is emitted when the button is interactively clicked by the user.

    The mouse parameter provides information about the click, including the x
    and y position of the release of the click, and whether the click was held.
*/

/*!
    \qmlsignal Qt.labs.controls::AbstractButton::doubleClicked(MouseEvent mouse)

    This signal is emitted when the button is interactively double clicked by the user.

    The mouse parameter provides information about the click, including the x
    and y position of the release of the click, and whether the click was held.
*/

QQuickAbstractButtonPrivate::QQuickAbstractButtonPrivate() :
    pressed(false), checked(false), checkable(false), exclusive(false),
    label(Q_NULLPTR), indicator(Q_NULLPTR)
{
}

QQuickAbstractButton::QQuickAbstractButton(QQuickItem *parent) :
    QQuickControl(*(new QQuickAbstractButtonPrivate), parent)
{
    setActiveFocusOnTab(true);
    setAcceptedMouseButtons(Qt::LeftButton);
    setAccessibleRole(0x0000002B); //QAccessible::Button
}

QQuickAbstractButton::QQuickAbstractButton(QQuickAbstractButtonPrivate &dd, QQuickItem *parent) :
    QQuickControl(dd, parent)
{
    setActiveFocusOnTab(true);
    setAcceptedMouseButtons(Qt::LeftButton);
    setAccessibleRole(0x0000002B); //QAccessible::Button
}

/*!
    \qmlproperty string Qt.labs.controls::AbstractButton::text

    This property holds a textual description of the button.

    \note The text is used for accessibility purposes, so it makes sense to
          set a textual description even if the label item is an image.

    \sa label
*/
QString QQuickAbstractButton::text() const
{
    Q_D(const QQuickAbstractButton);
    return d->text;
}

void QQuickAbstractButton::setText(const QString &text)
{
    Q_D(QQuickAbstractButton);
    if (d->text != text) {
        d->text = text;
        setAccessibleName(text);
        emit textChanged();
    }
}

/*!
    \qmlproperty bool Qt.labs.controls::AbstractButton::pressed

    This property holds whether the button is pressed.
*/
bool QQuickAbstractButton::isPressed() const
{
    Q_D(const QQuickAbstractButton);
    return d->pressed;
}

void QQuickAbstractButton::setPressed(bool isPressed)
{
    Q_D(QQuickAbstractButton);
    if (d->pressed != isPressed) {
        d->pressed = isPressed;
        setAccessibleProperty("pressed", isPressed);
        emit pressedChanged();
    }
}

/*!
    \qmlproperty bool Qt.labs.controls::AbstractButton::checked

    This property holds whether the button is checked.
*/
bool QQuickAbstractButton::isChecked() const
{
    Q_D(const QQuickAbstractButton);
    return d->checked;
}

void QQuickAbstractButton::setChecked(bool checked)
{
    Q_D(QQuickAbstractButton);
    if (d->checked != checked) {
        d->checked = checked;
        setAccessibleProperty("checked", checked);
        emit checkedChanged();
    }
}

/*!
    \qmlproperty bool Qt.labs.controls::AbstractButton::checkable

    This property holds whether the button is checkable.
*/
bool QQuickAbstractButton::isCheckable() const
{
    Q_D(const QQuickAbstractButton);
    return d->checkable;
}

void QQuickAbstractButton::setCheckable(bool checkable)
{
    Q_D(QQuickAbstractButton);
    if (d->checkable != checkable) {
        d->checkable = checkable;
        setAccessibleProperty("checkable", checkable);
        emit checkableChanged();
    }
}

bool QQuickAbstractButton::isExclusive() const
{
    Q_D(const QQuickAbstractButton);
    return d->exclusive;
}

void QQuickAbstractButton::setExclusive(bool exclusive)
{
    Q_D(QQuickAbstractButton);
    d->exclusive = exclusive;
}

/*!
    \qmlproperty Item Qt.labs.controls::AbstractButton::indicator

    This property holds the indicator item.
*/
QQuickItem *QQuickAbstractButton::indicator() const
{
    Q_D(const QQuickAbstractButton);
    return d->indicator;
}

void QQuickAbstractButton::setIndicator(QQuickItem *indicator)
{
    Q_D(QQuickAbstractButton);
    if (d->indicator != indicator) {
        delete d->indicator;
        d->indicator = indicator;
        if (indicator) {
            if (!indicator->parentItem())
                indicator->setParentItem(this);
            indicator->setAcceptedMouseButtons(Qt::LeftButton);
        }
        emit indicatorChanged();
    }
}

/*!
    \qmlproperty Item Qt.labs.controls::AbstractButton::label

    This property holds the label item.

    \sa text
*/
QQuickItem *QQuickAbstractButton::label() const
{
    Q_D(const QQuickAbstractButton);
    return d->label;
}

void QQuickAbstractButton::setLabel(QQuickItem *label)
{
    Q_D(QQuickAbstractButton);
    if (d->label != label) {
        delete d->label;
        d->label = label;
        if (label && !label->parentItem())
            label->setParentItem(this);
        emit labelChanged();
    }
}

/*!
    \qmlmethod void Qt.labs.controls::Button::toggle()

    Toggles the checked state of the button.
*/
void QQuickAbstractButton::toggle()
{
    Q_D(QQuickAbstractButton);
    setChecked(!d->checked);
}

void QQuickAbstractButton::focusOutEvent(QFocusEvent *event)
{
    Q_D(QQuickAbstractButton);
    QQuickControl::focusOutEvent(event);
    if (d->pressed) {
        setPressed(false);
        emit canceled();
    }
}

void QQuickAbstractButton::keyPressEvent(QKeyEvent *event)
{
    QQuickControl::keyPressEvent(event);
    if (event->key() == Qt::Key_Space) {
        setPressed(true);

        QQuickMouseEvent me(width() / 2, height() / 2, Qt::NoButton, Qt::NoButton, event->modifiers());
        emit pressed(&me);
        event->setAccepted(me.isAccepted());
    }
}

void QQuickAbstractButton::keyReleaseEvent(QKeyEvent *event)
{
    Q_D(QQuickAbstractButton);
    QQuickControl::keyReleaseEvent(event);
    if (event->key() == Qt::Key_Space) {
        setPressed(false);

        QQuickMouseEvent mre(width() / 2, height() / 2, Qt::NoButton, Qt::NoButton, event->modifiers());
        emit released(&mre);
        QQuickMouseEvent mce(width() / 2, height() / 2, Qt::NoButton, Qt::NoButton, event->modifiers(), true /* isClick */);
        emit clicked(&mce);
        if (d->checkable)
            setChecked(d->exclusive || !d->checked);
        event->setAccepted(mre.isAccepted() || mce.isAccepted());
    }
}

void QQuickAbstractButton::mousePressEvent(QMouseEvent *event)
{
    QQuickControl::mousePressEvent(event);
    setPressed(true);

    QQuickMouseEvent me(event->x(), event->y(), event->button(), event->buttons(), event->modifiers());
    emit pressed(&me);
    event->setAccepted(me.isAccepted());
}

void QQuickAbstractButton::mouseMoveEvent(QMouseEvent *event)
{
    QQuickControl::mouseMoveEvent(event);
    setPressed(contains(event->pos()));
}

void QQuickAbstractButton::mouseReleaseEvent(QMouseEvent *event)
{
    Q_D(QQuickAbstractButton);
    QQuickControl::mouseReleaseEvent(event);
    bool wasPressed = d->pressed;
    setPressed(false);

    if (wasPressed) {
        QQuickMouseEvent mre(event->x(), event->y(), event->button(), event->buttons(), event->modifiers());
        emit released(&mre);
        QQuickMouseEvent mce(event->x(), event->y(), event->button(), event->buttons(), event->modifiers(), true /* isClick */);
        emit clicked(&mce);
        event->setAccepted(mre.isAccepted() || mce.isAccepted());
    } else {
        emit canceled();
    }
    if (d->checkable && contains(event->pos()))
        setChecked(d->exclusive || !d->checked);
}

void QQuickAbstractButton::mouseDoubleClickEvent(QMouseEvent *event)
{
    QQuickControl::mouseDoubleClickEvent(event);

    QQuickMouseEvent me(event->x(), event->y(), event->button(), event->buttons(), event->modifiers(), true /* isClick */);
    emit doubleClicked(&me);
    event->setAccepted(me.isAccepted());
}

void QQuickAbstractButton::mouseUngrabEvent()
{
    Q_D(QQuickAbstractButton);
    QQuickControl::mouseUngrabEvent();
    if (d->pressed) {
        setPressed(false);
        emit canceled();
    }
}

QT_END_NAMESPACE