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/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2012 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**************************************************************************/
#include "basevalidatinglineedit.h"
#include <QDebug>
enum { debug = 0 };
/*!
\namespace Utils
General utility library namespace
*/
/*! \class Utils::BaseValidatingLineEdit
\brief Base class for line edits that perform validation.
Performs validation in a virtual validate() function to be implemented in
derived classes.
When invalid, the text color will turn red and a tooltip will
contain the error message. This approach is less intrusive than a
QValidator which will prevent the user from entering certain characters.
The widget has a concept of an "initialText" which can be something like
"<Enter name here>". This results in state 'DisplayingInitialText', which
is not valid, but is not marked red.
*/
namespace Utils {
struct BaseValidatingLineEditPrivate {
explicit BaseValidatingLineEditPrivate(const QWidget *w);
const QColor m_okTextColor;
QColor m_errorTextColor;
BaseValidatingLineEdit::State m_state;
QString m_errorMessage;
QString m_initialText;
bool m_firstChange;
};
BaseValidatingLineEditPrivate::BaseValidatingLineEditPrivate(const QWidget *w) :
m_okTextColor(BaseValidatingLineEdit::textColor(w)),
m_errorTextColor(Qt::red),
m_state(BaseValidatingLineEdit::Invalid),
m_firstChange(true)
{
}
BaseValidatingLineEdit::BaseValidatingLineEdit(QWidget *parent) :
QLineEdit(parent),
m_bd(new BaseValidatingLineEditPrivate(this))
{
// Note that textChanged() is also triggered automagically by
// QLineEdit::setText(), no need to trigger manually.
connect(this, SIGNAL(textChanged(QString)), this, SLOT(slotChanged(QString)));
}
BaseValidatingLineEdit::~BaseValidatingLineEdit()
{
delete m_bd;
}
QString BaseValidatingLineEdit::initialText() const
{
return m_bd->m_initialText;
}
void BaseValidatingLineEdit::setInitialText(const QString &t)
{
if (m_bd->m_initialText != t) {
m_bd->m_initialText = t;
m_bd->m_firstChange = true;
setText(t);
}
}
QColor BaseValidatingLineEdit::errorColor() const
{
return m_bd->m_errorTextColor;
}
void BaseValidatingLineEdit::setErrorColor(const QColor &c)
{
m_bd->m_errorTextColor = c;
}
QColor BaseValidatingLineEdit::textColor(const QWidget *w)
{
return w->palette().color(QPalette::Active, QPalette::Text);
}
void BaseValidatingLineEdit::setTextColor(QWidget *w, const QColor &c)
{
QPalette palette = w->palette();
palette.setColor(QPalette::Active, QPalette::Text, c);
w->setPalette(palette);
}
BaseValidatingLineEdit::State BaseValidatingLineEdit::state() const
{
return m_bd->m_state;
}
bool BaseValidatingLineEdit::isValid() const
{
return m_bd->m_state == Valid;
}
QString BaseValidatingLineEdit::errorMessage() const
{
return m_bd->m_errorMessage;
}
void BaseValidatingLineEdit::slotChanged(const QString &t)
{
m_bd->m_errorMessage.clear();
// Are we displaying the initial text?
const bool isDisplayingInitialText = !m_bd->m_initialText.isEmpty() && t == m_bd->m_initialText;
const State newState = isDisplayingInitialText ?
DisplayingInitialText :
(validate(t, &m_bd->m_errorMessage) ? Valid : Invalid);
setToolTip(m_bd->m_errorMessage);
if (debug)
qDebug() << Q_FUNC_INFO << t << "State" << m_bd->m_state << "->" << newState << m_bd->m_errorMessage;
// Changed..figure out if valid changed. DisplayingInitialText is not valid,
// but should not show error color. Also trigger on the first change.
if (newState != m_bd->m_state || m_bd->m_firstChange) {
const bool validHasChanged = (m_bd->m_state == Valid) != (newState == Valid);
m_bd->m_state = newState;
m_bd->m_firstChange = false;
setTextColor(this, newState == Invalid ? m_bd->m_errorTextColor : m_bd->m_okTextColor);
if (validHasChanged) {
emit validChanged(newState == Valid);
emit validChanged();
}
}
bool block = blockSignals(true);
const QString fixedString = fixInputString(t);
if (t != fixedString) {
const int cursorPos = cursorPosition();
setText(fixedString);
setCursorPosition(qMin(cursorPos, fixedString.length()));
}
blockSignals(block);
}
void BaseValidatingLineEdit::slotReturnPressed()
{
if (isValid())
emit validReturnPressed();
}
void BaseValidatingLineEdit::triggerChanged()
{
slotChanged(text());
}
QString BaseValidatingLineEdit::fixInputString(const QString &string)
{
return string;
}
} // namespace Utils
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