line_edit_with_button.cpp

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/*
 * Copyright (c) 2011, Willow Garage, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Willow Garage, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 */

#include "line_edit_with_button.h"

#include <QPushButton>
#include <QLineEdit>
#include <QHBoxLayout>
#include <QKeyEvent>
#include <QApplication>

#include <stdio.h>

namespace rviz
{

LineEditWithButton::LineEditWithButton( QWidget* parent )
  : QLineEdit( parent )
{
  button_ = new QPushButton( this );
  button_->setText( "..." );
  button_->setCursor( Qt::ArrowCursor );
  button_->setDefault( false );
  button_->setAutoDefault( false );
  button_->setFocusPolicy( Qt::NoFocus );

  connect( button_, SIGNAL( clicked() ), this, SLOT( onButtonClick() ));
}

void LineEditWithButton::resizeEvent( QResizeEvent* event )
{
  // This widget does not use a QLayout object, because I want the
  // child button to be sized and positioned a specific way.  This
  // function lays out the child button based on the new size of the
  // LineEdit.

  int padding = 1;

  // Make sure the text area doesn't go under the button.
  setTextMargins( padding, padding, height(), padding );

  // Call the original resize handler.
  QLineEdit::resizeEvent( event );

  // Make the button square, matching the height of this widget minus
  // padding, and located all the way to the right.
  int button_width = height() - 2 * padding;
  int button_height = button_width;
  button_->setGeometry( width() - button_width - padding, padding,
                        button_width, button_height );
}

void LineEditWithButton::simulateReturnPressed()
{
  // I couldn't find a way to directly tell the editor that I was
  // done with it here.  "Q_EMIT returnPressed()", "Q_EMIT
  // editingFinished()" etc did nothing.  So instead, here I
  // simulate the user pressing and releasing the "Return" key,
  // which does indeed make it act like I want: when you select a
  // topic from the dialog and the dialog closes, the property's
  // Setter is called and this editor closes.
  QKeyEvent* event = new QKeyEvent( QEvent::KeyPress, Qt::Key_Return, Qt::NoModifier );
  QApplication::postEvent( this, event );
  event = new QKeyEvent( QEvent::KeyRelease, Qt::Key_Return, Qt::NoModifier );
  QApplication::postEvent( this, event );
}

} // end namespace rviz