pickfileradio.cpp

/*
 *  pickfileradio.cpp  -  radio button with an associated file picker
 *  Program:  kalarm
 *  Copyright (C) 2005 by David Jarvie <software@astrojar.org.uk>
 *
 *  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 <tqbuttongroup.h>
#include <tqpushbutton.h>
#include <tqtimer.h>
 
#include <kdebug.h>
 
#include "lineedit.h"
#include "pickfileradio.moc"
 
 
PickFileRadio::PickFileRadio(TQPushButton* button, LineEdit* edit, const TQString& text, TQButtonGroup* parent, const char* name)
    : RadioButton(text, parent, name),
      mGroup(parent),
      mEdit(edit),
      mButton(button),
      mLastId(-1),     // set to an invalid value
      mRevertId(false)
{
    Q_ASSERT(parent);
    Q_ASSERT(button);
    mButton->setEnabled(false);
    connect(mButton, TQ_SIGNAL(clicked()), TQ_SLOT(slotPickFile()));
    if (mEdit)
        mEdit->setEnabled(false);
    connect(mGroup, TQ_SIGNAL(buttonSet(int)), TQ_SLOT(slotSelectionChanged(int)));
}
 
PickFileRadio::PickFileRadio(const TQString& text, TQButtonGroup* parent, const char* name)
    : RadioButton(text, parent, name),
      mGroup(parent),
      mEdit(0),
      mButton(0),
      mLastId(-1),     // set to an invalid value
      mRevertId(false)
{
    Q_ASSERT(parent);
}
 
void PickFileRadio::init(TQPushButton* button, LineEdit* edit)
{
    Q_ASSERT(button);
    mEdit   = edit;
    mButton = button;
    mButton->setEnabled(false);
    connect(mButton, TQ_SIGNAL(clicked()), TQ_SLOT(slotPickFile()));
    if (mEdit)
        mEdit->setEnabled(false);
    connect(mGroup, TQ_SIGNAL(buttonSet(int)), TQ_SLOT(slotSelectionChanged(int)));
    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 TQString& file)
{
    mFile = file;
}
 
TQString 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->selected() == 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(int id)
{
    if (id == mLastId  ||  mRevertId)
        return;
    int radioId = mGroup->id(this);
    if (mLastId == radioId)
    {
        mButton->setEnabled(false);
        if (mEdit)
            mEdit->setEnabled(false);
    }
    else if (id == radioId)
    {
        if (!pickFileIfNone())
            return;    // revert to previously selected type
        mButton->setEnabled(true);
        if (mEdit)
            mEdit->setEnabled(true);
    }
    mLastId = id;
}
 
/******************************************************************************
* Prompt for a file name if there is none currently entered.
*/
bool PickFileRadio::pickFileIfNone()
{
    if (mEdit)
        mFile = mEdit->text();
    if (!mFile.isEmpty())
        return true;
    slotPickFile();
    return !mFile.isEmpty();
}
 
/******************************************************************************
* Called when the file picker button is clicked.
*/
void PickFileRadio::slotPickFile()
{
    mFile = pickFile();
    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.
        mRevertId = true;   // prevent picker dialogue popping up twice
        TQTimer::singleShot(0, this, TQ_SLOT(setLastId()));
    }
}
 
/******************************************************************************
* Select the previously selected radio button in the group.
*/
void PickFileRadio::setLastId()
{
    if (mLastId == -1)
        setOn(false);    // we don't know the previous selection, so just turn this button off
    else
        mGroup->setButton(mLastId);
    mRevertId = false;
}