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/* BEGIN_COMMON_COPYRIGHT_HEADER
* (c)LGPL2+
*
* LXQt - a lightweight, Qt based, desktop toolset
* https://lxqt.org
*
* Copyright: 2021 LXQt team
*
* This program or library is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* END_COMMON_COPYRIGHT_HEADER */
#include "custombutton.h"
#include <QMouseEvent>
#include <QPainter>
#include <QStylePainter>
#include <QStyleOptionToolButton>
#include <QProxyStyle>
#include <cmath>
#include <algorithm>
class LeftAlignedTextStyle : public QProxyStyle
{
using QProxyStyle::QProxyStyle;
public:
virtual void drawItemText(QPainter * painter, const QRect & rect, int flags
, const QPalette & pal, bool enabled, const QString & text
, QPalette::ColorRole textRole = QPalette::NoRole) const override;
};
void LeftAlignedTextStyle::drawItemText(QPainter * painter, const QRect & rect, int flags
, const QPalette & pal, bool enabled, const QString & text
, QPalette::ColorRole textRole) const
{
QString txt = text;
// get the button text because the text that's given to this function may be middle-elided
if (const QToolButton *tb = dynamic_cast<const QToolButton*>(painter->device()))
txt = tb->text();
txt = QFontMetrics(painter->font()).elidedText(txt, Qt::ElideRight, rect.width());
QProxyStyle::drawItemText(painter, rect, (flags & ~Qt::AlignHCenter) | Qt::AlignLeft, pal, enabled, txt, textRole);
}
CustomButton::CustomButton(ILXQtPanelPlugin *plugin, QWidget* parent):
QToolButton(parent),
mPlugin(plugin),
mPanel(plugin->panel()),
mMaxWidth(200)
{
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
setAutoRaise(true);
setContentsMargins(0, 0, 0, 0);
setMinimumWidth(1);
setMinimumHeight(1);
setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
setStyle(new LeftAlignedTextStyle());
updateWidth();
}
CustomButton::~CustomButton() = default;
void CustomButton::wheelEvent(QWheelEvent *event)
{
QPoint anglePoint = event->angleDelta();
bool horizontal(std::abs(event->angleDelta().x()) > std::abs(anglePoint.y()));
int delta = horizontal ? anglePoint.x() : anglePoint.y();
emit wheelScrolled(delta);
event->accept();
}
void CustomButton::setMaxWidth(int maxWidth)
{
mMaxWidth = maxWidth;
updateWidth();
}
void CustomButton::updateWidth()
{
int newWidth = std::min(sizeHint().width(), mMaxWidth);
if (mOrigin == Qt::TopLeftCorner) {
setFixedWidth(newWidth);
setMinimumHeight(1);
setMaximumHeight(QWIDGETSIZE_MAX);
}
else {
setMinimumWidth(1);
setMaximumWidth(QWIDGETSIZE_MAX);
setFixedHeight(newWidth);
}
update();
}
void CustomButton::setOrigin(Qt::Corner newOrigin)
{
if (mOrigin != newOrigin) {
mOrigin = newOrigin;
updateWidth();
}
}
void CustomButton::setAutoRotation(bool value)
{
if (value) {
switch (mPanel->position())
{
case ILXQtPanel::PositionTop:
case ILXQtPanel::PositionBottom:
setOrigin(Qt::TopLeftCorner);
break;
case ILXQtPanel::PositionLeft:
setOrigin(Qt::BottomLeftCorner);
break;
case ILXQtPanel::PositionRight:
setOrigin(Qt::TopRightCorner);
break;
}
}
else
setOrigin(Qt::TopLeftCorner);
}
void CustomButton::paintEvent(QPaintEvent *event)
{
if (mOrigin == Qt::TopLeftCorner) {
QToolButton::paintEvent(event);
return;
}
QSize sz = size();
bool transpose = false;
QTransform transform;
switch (mOrigin)
{
case Qt::TopLeftCorner:
break;
case Qt::TopRightCorner:
transform.rotate(90.0);
transform.translate(0.0, -sz.width());
transpose = true;
break;
case Qt::BottomRightCorner:
transform.rotate(180.0);
transform.translate(-sz.width(), -sz.height());
break;
case Qt::BottomLeftCorner:
transform.rotate(270.0);
transform.translate(-sz.height(), 0.0);
transpose = true;
break;
}
QStylePainter painter(this);
painter.setTransform(transform);
QStyleOptionToolButton opt;
initStyleOption(&opt);
if (transpose)
opt.rect = opt.rect.transposed();
painter.drawComplexControl(QStyle::CC_ToolButton, opt);
}
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