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hotkeywidget.cpp
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/*
* Copyright (C) 2016 Christian Kaiser
*
* 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 library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <QApplication>
#include <QFocusEvent>
#include <QKeyEvent>
#include <QKeySequence>
#include <QStyle>
#include <QTimer>
#include "hotkeywidget.h"
HotkeyWidget::HotkeyWidget(QWidget *parent) :
QPushButton(parent), mHotkey(QKeySequence()), mShowingError(false), mKeyboardFocus(false)
{
mDefaultStyleSheet = "text-align: left; padding: 3px 6px;";
setStyleSheet(mDefaultStyleSheet);
setText(tr("Click to select hotkey..."));
setObjectName("HotkeyWidget");
if (qApp->style()->objectName() == "oxygen") {
setMinimumWidth(130);
}
else {
setMinimumWidth(110);
}
}
void HotkeyWidget::setHotkey(QString hotkeyString)
{
mHotkey = QKeySequence().fromString(hotkeyString, QKeySequence::NativeText);
setHotkeyText();
}
QString HotkeyWidget::hotkey() const
{
return mHotkey.toString(QKeySequence::PortableText);
}
void HotkeyWidget::showError()
{
if (mShowingError)
return;
mShowingError = true;
setStyleSheet(mDefaultStyleSheet + "color: #d90000;");
QTimer::singleShot(1000, this, SLOT(hideError()));
}
void HotkeyWidget::setHotkeyText()
{
QString hotkeyText = mHotkey.toString(QKeySequence::NativeText);
setText(hotkeyText);
parentWidget()->setFocus();
}
bool HotkeyWidget::event(QEvent *event)
{
if (event->type() == QEvent::LanguageChange) {
setHotkeyText();
}
else if (event->type() == QEvent::KeyPress) {
keyPressEvent(static_cast<QKeyEvent *>(event));
return true;
}
else if (event->type() == QEvent::FocusIn) {
QFocusEvent* focusEvent = static_cast<QFocusEvent*>(event);
if (focusEvent->reason() != Qt::TabFocusReason) {
setText(tr("Type your hotkey"));
mKeyboardFocus = false;
grabKeyboard();
}
else {
mKeyboardFocus = true;
}
}
else if (event->type() == QEvent::FocusOut) {
if (text() == tr("Invalid hotkey")) {
emit invalidHotkeyError();
showError();
}
releaseKeyboard();
setHotkeyText(); // Reset the text
}
else if ((event->type() == QEvent::KeyPress || event->type() == QEvent::ShortcutOverride || event->type() == QEvent::Shortcut) && hasFocus()) {
event->accept();
return true;
}
return QPushButton::event(event);
}
void HotkeyWidget::keyPressEvent(QKeyEvent *event)
{
if (mKeyboardFocus)
return;
if (isModifier(event->key()))
return;
if (!isValid(event->key())) {
setText(tr("Invalid hotkey"));
parentWidget()->setFocus();
return;
}
mHotkey = QKeySequence(event->key() + (event->modifiers() & ~Qt::KeypadModifier));
setHotkeyText();
}
void HotkeyWidget::hideError()
{
setStyleSheet(mDefaultStyleSheet);
mShowingError = false;
}
bool HotkeyWidget::isValid(int key) const
{
switch (key)
{
case 0:
case Qt::Key_Escape:
case Qt::Key_unknown:
return false;
}
return !isModifier(key);
}
bool HotkeyWidget::isModifier(int key) const
{
switch (key)
{
case Qt::Key_Shift:
case Qt::Key_Control:
case Qt::Key_Meta:
case Qt::Key_Alt:
case Qt::Key_AltGr:
case Qt::Key_Super_L:
case Qt::Key_Super_R:
case Qt::Key_Menu:
return true;
}
return false;
}

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