kde-playground/kdepim/kalarm/pickfileradio.cpp
2015-04-14 21:49:29 +00:00

192 lines
5.4 KiB
C++

/*
* pickfileradio.cpp - radio button with an associated file picker
* Program: kalarm
* Copyright © 2005,2009 by David Jarvie <djarvie@kde.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "kalarm.h"
#include "pickfileradio.h"
#include "buttongroup.h"
#include "lineedit.h"
#include <kdebug.h>
#include <QPushButton>
#include <QTimer>
PickFileRadio::PickFileRadio(QPushButton* button, LineEdit* edit, const QString& text, ButtonGroup* group, QWidget* parent)
: RadioButton(text, parent),
mGroup(group),
mEdit(0),
mLastButton(0),
mRevertButton(false)
{
Q_ASSERT(parent);
init(button, edit);
}
PickFileRadio::PickFileRadio(const QString& text, ButtonGroup* group, QWidget* parent)
: RadioButton(text, parent),
mGroup(group),
mEdit(0),
mButton(0),
mLastButton(0),
mRevertButton(false)
{
Q_ASSERT(parent);
}
void PickFileRadio::init(QPushButton* button, LineEdit* edit)
{
Q_ASSERT(button);
if (mEdit)
mEdit->disconnect(this);
mEdit = edit;
mButton = button;
mButton->setEnabled(false);
connect(mButton, SIGNAL(clicked()), SLOT(slotPickFile()));
if (mEdit)
{
mEdit->setEnabled(false);
connect(mEdit, SIGNAL(textChanged(QString)), SIGNAL(fileChanged()));
}
connect(mGroup, SIGNAL(buttonSet(QAbstractButton*)), SLOT(slotSelectionChanged(QAbstractButton*)));
setReadOnly(RadioButton::isReadOnly());
}
void PickFileRadio::setReadOnly(bool ro)
{
RadioButton::setReadOnly(ro);
if (mButton)
{
if (mEdit)
mEdit->setReadOnly(ro);
if (ro)
mButton->hide();
else
mButton->show();
}
}
void PickFileRadio::setFile(const QString& file)
{
mFile = file;
}
QString PickFileRadio::file() const
{
return mEdit ? mEdit->text() : mFile;
}
/******************************************************************************
* Set the radio button enabled or disabled.
* Adjusts the enabled/disabled state of other controls appropriately.
*/
void PickFileRadio::setEnabled(bool enable)
{
Q_ASSERT(mButton);
RadioButton::setEnabled(enable);
enable = enable && mGroup->checkedButton() == this;
if (enable)
{
if (!pickFileIfNone())
enable = false; // revert to previously selected type
}
mButton->setEnabled(enable);
if (mEdit)
mEdit->setEnabled(enable);
}
/******************************************************************************
* Called when the selected radio button changes.
*/
void PickFileRadio::slotSelectionChanged(QAbstractButton* button)
{
if (button == mLastButton || mRevertButton)
return;
if (mLastButton == this)
{
mButton->setEnabled(false);
if (mEdit)
mEdit->setEnabled(false);
}
else if (button == this)
{
if (!pickFileIfNone())
return; // revert to previously selected type
mButton->setEnabled(true);
if (mEdit)
mEdit->setEnabled(true);
}
mLastButton = button;
}
/******************************************************************************
* Prompt for a file name if there is none currently entered.
*/
bool PickFileRadio::pickFileIfNone()
{
if (mEdit)
mFile = mEdit->text();
if (!mFile.isEmpty())
return true;
return !slotPickFile().isEmpty();
}
/******************************************************************************
* Called when the file picker button is clicked.
* Reply = mFile, or null string if dialogue, and 'this', was deleted.
*/
QString PickFileRadio::slotPickFile()
{
// To avoid crashes on application quit, we need to check whether the
// dialogue, and hence this PickFileRadio, was deleted while active,
// before accessing class members.
QString file = pickFile();
if (file.isNull())
return file; // 'this' is probably invalid now
if (!file.isEmpty())
{
mFile = file;
if (mEdit)
mEdit->setText(mFile);
}
if (mFile.isEmpty())
{
// No file is selected, so revert to the previous radio button selection.
// But wait a moment before setting the radio button, or it won't work.
mRevertButton = true; // prevent picker dialog popping up twice
QTimer::singleShot(0, this, SLOT(setLastButton()));
}
return mFile;
}
/******************************************************************************
* Select the previously selected radio button in the group.
*/
void PickFileRadio::setLastButton()
{
if (!mLastButton)
setChecked(false); // we don't know the previous selection, so just turn this button off
else
mLastButton->setChecked(true);
mRevertButton = false;
}
#include "moc_pickfileradio.cpp"
// vim: et sw=4: