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GroupBoxWidget.cpp
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GroupBoxWidget.cpp
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/***************************************************************************
* *
* This file is part of the Fotowall project, *
* http://code.google.com/p/fotowall *
* *
* Copyright (C) 2009 by Enrico Ros <enrico.ros@gmail.com> *
* *
* 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. *
* *
***************************************************************************/
#include "GroupBoxWidget.h"
#include <QLayout>
#include <QFontMetrics>
#include <QPainter>
#include <QStyleOptionButton>
#include <QStyle>
#include <QTimer>
#include <QVariant>
#if QT_VERSION >= 0x040600
#include <QPropertyAnimation>
#define ANIMATE_PARAM(propName, duration, endValue, finalizeLayout) \
{QPropertyAnimation * ani = new QPropertyAnimation(this, propName, this); \
if (finalizeLayout) connect(ani, SIGNAL(finished()), this, SLOT(slotFinalizeDesign())); \
ani->setEasingCurve(QEasingCurve::OutQuint); \
ani->setDuration(duration); \
ani->setEndValue(endValue); \
ani->start(QPropertyAnimation::DeleteWhenStopped);}
#else
#define ANIMATE_PARAM(propName, duration, endValue, finalizeLayout) \
{setProperty(propName, endValue); \
if (finalizeLayout) slotFinalizeDesign();}
#endif
GroupBoxWidget::GroupBoxWidget(QWidget * parent)
: QWidget(parent)
, m_redesignTimer(0)
, m_collapsed(false)
, m_checkable(false)
, m_checked(true)
, m_borderFlags(0)
, m_checkValue(1.0)
, m_hoverValue(0.0)
{
// setup groupbox text
m_titleFont = font();
m_titleFont.setPixelSize(10);
// using a fixed HSizePolicy we better integrate with auto-layouting
setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Preferred);
// hide junk before initial layouting
hide();
}
QString GroupBoxWidget::title() const
{
return m_titleText;
}
void GroupBoxWidget::setTitle(const QString & title)
{
m_titleText = title;
updateDesign();
}
int GroupBoxWidget::titleSize() const
{
return m_titleFont.pixelSize();
}
void GroupBoxWidget::setTitleSize(int titleSize)
{
m_titleFont.setPointSize(titleSize);
updateDesign();
}
bool GroupBoxWidget::isCheckable() const
{
return m_checkable;
}
void GroupBoxWidget::setCheckable(bool checkable)
{
if (m_checkable == checkable)
return;
m_checkable = checkable;
updateDesign();
}
bool GroupBoxWidget::isChecked() const
{
return m_checkable ? m_checked : false;
}
void GroupBoxWidget::setChecked(bool checked)
{
if (!m_checkable || m_checked == checked)
return;
m_checked = checked;
emit toggled(checked);
updateDesign();
}
int GroupBoxWidget::borderFlags() const
{
return m_borderFlags;
}
void GroupBoxWidget::setBorderFlags(int flags)
{
m_borderFlags = flags;
update();
}
void GroupBoxWidget::collapse()
{
if (!m_collapsed) {
m_collapsed = true;
updateDesign();
}
}
void GroupBoxWidget::expand()
{
if (m_collapsed) {
m_collapsed = false;
updateDesign();
}
}
void GroupBoxWidget::enterEvent(QEvent *)
{
ANIMATE_PARAM("hAnim", 400, 1.0, false);
}
void GroupBoxWidget::leaveEvent(QEvent *)
{
ANIMATE_PARAM("hAnim", 400, 0.0, false);
}
void GroupBoxWidget::mousePressEvent(QMouseEvent * /*event*/)
{
setChecked(!isChecked());
}
void GroupBoxWidget::paintEvent(QPaintEvent * /*event*/)
{
// skip the rest of the painting if no text
if (m_titleText.isEmpty())
return;
// draw hovering
QPainter p(this);
if (m_hoverValue > 0 && (m_checkValue == 0.0 || m_checkValue == 1.0)) {
QRadialGradient rg = m_checkValue == 1.0 ? QRadialGradient(0.5, 0.2, 0.8) : QRadialGradient(0.5, 1.0, 1.5);
QColor startColor(Qt::white);
startColor.setAlpha((int)(255.0 * m_hoverValue));
rg.setColorAt(0.0, startColor);
rg.setColorAt(1.0, Qt::transparent);
rg.setColorAt(0.0, startColor);
rg.setColorAt(1.0, Qt::transparent);
rg.setCoordinateMode(QGradient::ObjectBoundingMode);
p.fillRect(0, 0, width(), height() - m_checkValue * (height() - 12) , rg);
}
// draw left/right lines
if (m_borderFlags & 0x0001)
p.fillRect(0, 0, 1, height(), QColor(230, 230, 230));
if (m_borderFlags & 0x0002)
p.fillRect(width() - 1, 0, 1, height(), Qt::white);
// precalc text position and move painter
QStyle * ss = m_checkable ? style() : 0;
int indW = ss ? ss->pixelMetric(QStyle::PM_IndicatorWidth, 0, 0) : 0;
int indH = ss ? ss->pixelMetric(QStyle::PM_IndicatorHeight, 0, 0) : 0;
p.save();
p.setFont(m_titleFont);
QFontMetrics metrics(m_titleFont);
QRect textRect = metrics.boundingRect(m_titleText);
// int textHeight = textRect.height();
int dx = 0;
if (m_checkValue < 1.0) {
qreal x1 = -textRect.top() + 2,
x2 = (width() - textRect.width() - indW - 4) / 2;
qreal y1 = height() - 2, //height() + textRect.width()) / 2,
y2 = -textRect.top();
p.translate(x1 + m_checkValue * (x2 - x1), y1 + m_checkValue * (y2 - y1));
p.rotate(m_checkValue * 90 - 90);
} else
p.translate((width() - textRect.width() - indW - 4) / 2, -textRect.top());
// draw checkbox indicator
if (m_checkable && indW && indH) {
QStyleOptionButton opt;
opt.state = QStyle::State_Enabled;
int styleOffset = (textRect.height() - indH) / 2;
opt.rect = QRect(0, -indH + 4 - styleOffset, indW, indH);
dx = indW + 4;
opt.state |= m_checked ? QStyle::State_On : QStyle::State_Off;
if (underMouse())
opt.state |= QStyle::State_MouseOver;
//p.setRenderHints(QPainter::Antialiasing);
style()->drawPrimitive(QStyle::PE_IndicatorCheckBox, &opt, &p, this);
}
// draw text
p.drawText(dx, 0, m_titleText);
p.restore();
}
qreal GroupBoxWidget::checkValue() const
{
return m_checkValue;
}
void GroupBoxWidget::setCheckValue(qreal value)
{
m_checkValue = value;
update();
}
qreal GroupBoxWidget::hoverValue() const
{
return m_hoverValue;
}
void GroupBoxWidget::setHoverValue(qreal value)
{
m_hoverValue = value;
update();
}
int GroupBoxWidget::calcMinWidth() const
{
return qMax(QFontMetrics(m_titleFont).width(m_titleText) + 12, QWidget::sizeHint().width());
}
void GroupBoxWidget::updateDesign()
{
if (m_collapsed) {
// full collapse: no pre-work
} else if (m_checkable && !m_checked) {
// checkable off: label on left
setContentsMargins(m_titleFont.pixelSize() + 8, 0, 0, 0);
setCursor(Qt::PointingHandCursor);
} else {
// normal: label on top
setContentsMargins(0, m_titleFont.pixelSize() + 8, 0, 0);
setCursor(Qt::ArrowCursor);
}
// defer and accumulate layout calculations
if (!m_redesignTimer) {
m_redesignTimer = new QTimer(this);
m_redesignTimer->setSingleShot(true);
connect(m_redesignTimer, SIGNAL(timeout()), SLOT(slotAnimateDesign()));
}
m_redesignTimer->start();
}
void GroupBoxWidget::slotAnimateDesign()
{
if (m_collapsed) {
// full collapse: shrink to zero
ANIMATE_PARAM("fixedWidth", 200, 0, true)
} else if (m_checkable && !m_checked) {
// checkable off: shrink to the target width
ANIMATE_PARAM("fixedWidth", 300, m_titleFont.pixelSize() + 8, true);
ANIMATE_PARAM("cAnim", 300, 0.0, false);
} else {
// normal: expand to the full size
ANIMATE_PARAM("fixedWidth", 400, calcMinWidth(), true);
ANIMATE_PARAM("cAnim", 200, 1.0, false);
}
// it was hidden in the constructor for not showing junk before initial layouting
show();
}
void GroupBoxWidget::slotFinalizeDesign()
{
if (m_collapsed) {
// full collapse: zero width
setFixedWidth(0);
} else if (m_checkable && !m_checked) {
// checkable off: left label
setFixedWidth(m_titleFont.pixelSize() + 8);
setCheckValue(0.0);
} else {
// normal: layout driven
setMinimumWidth(calcMinWidth());
setMaximumWidth(QWIDGETSIZE_MAX);
setCheckValue(1.0);
}
}