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/*
* pictdefileradio.h - 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.
*/
#ifndef PICTDEFILERADIO_H
#define PICTDEFILERADIO_H
/** @file pictdefileradio.h - radio button with an associated file picker */
#include "radiobutton.h"
class TQPushButton;
class LineEdit;
/**
* @short Radio button with associated file picker controls.
*
* The PickFileRadio class is a radio button with an associated button to choose
* a file, and an optional file name edit box. Its purpose is to ensure that while
* the radio button is selected, the chosen file name is never blank.
*
* To achieve this, whenever the button is newly selected and the
* file name is currently blank, the file picker dialogue is displayed to choose a
* file. If the dialogue exits without a file being chosen, the radio button selection
* is reverted to the previously selected button in the parent button group.
*
* The class handles the activation of the file picker dialogue (via a virtual method
* which must be supplied by deriving a class from this one). It also handles all
* enabling and disabling of the browse button and edit box when the enable state of
* the radio button is changed, and when the radio button selection changes.
*
* @author David Jarvie <software@astrojar.org.uk>
*/
class PickFileRadio : public RadioButton
{
Q_OBJECT
public:
/** Constructor.
* @param button Push button to invoke the file picker dialogue.
* @param edit File name edit widget, or null if there is none.
* @param text Radio button's text.
* @param parent Button group which is to be the parent object for the radio button.
* @param name The name of this widget.
*/
PickFileRadio(TQPushButton* button, LineEdit* edit, const TQString& text, TQButtonGroup* parent, const char* name = 0);
/** Constructor.
* The init() method must be called before the widget can be used.
* @param text Radio button's text.
* @param parent Button group which is to be the parent object for the radio button.
* @param name The name of this widget.
*/
PickFileRadio(const TQString& text, TQButtonGroup* parent, const char* name = 0);
/** Initialises the widget.
* @param button Push button to invoke the file picker dialogue.
* @param edit File name edit widget, or null if there is none.
*/
void init(TQPushButton* button, LineEdit* edit = 0);
/** Sets whether the radio button and associated widgets are read-only for the user.
* If read-only, their states cannot be changed by the user.
* @param readOnly True to set the widgets read-only, false to set them read-write.
*/
virtual void setReadOnly(bool readOnly);
/** Chooses a file, for example by displaying a file selection dialogue.
* This method is called when the push button is clicked - the client
* should not activate a file selection dialogue directly.
* @return Selected file name, or TQString() if no selection made.
*/
virtual TQString pickFile() = 0;
/** Notifies the widget of the currently selected file name.
* This should only be used when no file name edit box is used.
* It should be called to initialise the widget's data, and also any time the file
* name is changed without using the push button.
*/
void setFile(const TQString& file);
/** Returns the currently selected file name. */
TQString file() const;
/** Returns the associated file name edit widget, or null if none. */
LineEdit* fileEdit() const { return mEdit; }
/** Returns the associated file browse push button. */
TQPushButton* pushButton() const { return mButton; }
public slots:
/** Enables or disables the radio button, and adjusts the enabled state of the
* associated browse button and file name edit box.
*/
virtual void setEnabled(bool);
private slots:
void slotSelectionChanged(int id);
void slotPickFile();
void setLastId();
private:
bool pickFileIfNone();
TQButtonGroup* mGroup; // button group which radio button is in
LineEdit* mEdit; // file name edit box, or null if none
TQPushButton* mButton; // push button to pick a file
TQString mFile; // saved file name (if mEdit is null)
int mLastId; // previous radio button selected
bool mRevertId; // true to revert to the previous radio button selection
};
#endif // PICTDEFILERADIO_H
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