Implement setDoubleStep for QInputDialog

setDoubleStep works in the same manner as for setIntStep in that it is
just available for input dialogs getting a double.

[ChangeLog][QtWidgets][QInputDialog] Added setDoubleStep to enable
changing of the step amount for getDouble().

Task-number: QTBUG-17547
Change-Id: I5cabcfceb23324f8045f2b1e49017644418db01a
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/src/widgets/dialogs/qinputdialog.cpp b/src/widgets/dialogs/qinputdialog.cpp
index 04d13045e5..4c0f22ae97 100644
--- a/src/widgets/dialogs/qinputdialog.cpp
+++ b/src/widgets/dialogs/qinputdialog.cpp
@@ -1368,12 +1368,48 @@ double QInputDialog::getDouble(QWidget *parent, const QString &title, const QStr
                                double value, double min, double max, int decimals, bool *ok,
                                Qt::WindowFlags flags)
 {
+    return QInputDialog::getDouble(parent, title, label, value, min, max, decimals, ok, flags, 1.0);
+}
+
+/*!
+    \overload
+    Static convenience function to get a floating point number from the user.
+
+    \a title is the text which is displayed in the title bar of the dialog.
+    \a label is the text which is shown to the user (it should say what should
+    be entered).
+    \a value is the default floating point number that the line edit will be
+    set to.
+    \a min and \a max are the minimum and maximum values the user may choose.
+    \a decimals is the maximum number of decimal places the number may have.
+    \a step is the amount by which the values change as the user presses the
+    arrow buttons to increment or decrement the value.
+
+    If \a ok is nonnull, *\a ok will be set to true if the user pressed \uicontrol OK
+    and to false if the user pressed \uicontrol Cancel. The dialog's parent is
+    \a parent. The dialog will be modal and uses the widget \a flags.
+
+    This function returns the floating point number which has been entered by
+    the user.
+
+    Use this static function like this:
+
+    \snippet dialogs/standarddialogs/dialog.cpp 1
+
+    \sa getText(), getInt(), getItem(), getMultiLineText()
+*/
+
+double QInputDialog::getDouble(QWidget *parent, const QString &title, const QString &label,
+                               double value, double min, double max, int decimals, bool *ok,
+                               Qt::WindowFlags flags, double step)
+{
     QAutoPointer<QInputDialog> dialog(new QInputDialog(parent, flags));
     dialog->setWindowTitle(title);
     dialog->setLabelText(label);
     dialog->setDoubleDecimals(decimals);
     dialog->setDoubleRange(min, max);
     dialog->setDoubleValue(value);
+    dialog->setDoubleStep(step);
 
     const int ret = dialog->exec();
     if (ok)
@@ -1439,6 +1475,31 @@ QString QInputDialog::getItem(QWidget *parent, const QString &title, const QStri
 }
 
 /*!
+    \property QInputDialog::doubleStep
+    \since 5.10
+    \brief the step by which the double value is increased and decreased
+
+    This property is only relevant when the input dialog is used in
+    DoubleInput mode.
+*/
+
+void QInputDialog::setDoubleStep(double step)
+{
+    Q_D(QInputDialog);
+    d->ensureDoubleSpinBox();
+    d->doubleSpinBox->setSingleStep(step);
+}
+
+double QInputDialog::doubleStep() const
+{
+    Q_D(const QInputDialog);
+    if (d->doubleSpinBox)
+        return d->doubleSpinBox->singleStep();
+    else
+        return 1.0;
+}
+
+/*!
     \fn void QInputDialog::doubleValueChanged(double value)
 
     This signal is emitted whenever the double value changes in the dialog.