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