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+/*
+ * pickfileradio.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 PICKFILERADIO_H
+#define PICKFILERADIO_H
+
+/** @file pickfileradio.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 // PICKFILERADIO_H