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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "sizehandlerect.h"
#include "widgethostconstants.h"
#include <QDesignerFormWindowInterface>
#include <QMouseEvent>
#include <QPainter>
#include <QFrame>
#include <QDebug>
enum { debugSizeHandle = 0 };
using namespace SharedTools::Internal;
SizeHandleRect::SizeHandleRect(QWidget *parent, Direction d, QWidget *resizable) :
QWidget(parent),
m_dir(d),
m_resizable(resizable),
m_state(SelectionHandleOff)
{
setBackgroundRole(QPalette::Text);
setAutoFillBackground(true);
setFixedSize(SELECTION_HANDLE_SIZE, SELECTION_HANDLE_SIZE);
setMouseTracking(false);
updateCursor();
}
void SizeHandleRect::updateCursor()
{
switch (m_dir) {
case Right:
case RightTop:
setCursor(Qt::SizeHorCursor);
return;
case RightBottom:
setCursor(Qt::SizeFDiagCursor);
return;
case LeftBottom:
case Bottom:
setCursor(Qt::SizeVerCursor);
return;
default:
break;
}
setCursor(Qt::ArrowCursor);
}
void SizeHandleRect::paintEvent(QPaintEvent *)
{
switch (m_state) {
case SelectionHandleOff:
break;
case SelectionHandleInactive: {
QPainter p(this);
p.setPen(Qt::red);
p.drawRect(0, 0, width() - 1, height() - 1);
}
break;
case SelectionHandleActive: {
QPainter p(this);
p.setPen(Qt::blue);
p.drawRect(0, 0, width() - 1, height() - 1);
}
break;
}
}
void SizeHandleRect::mousePressEvent(QMouseEvent *e)
{
e->accept();
if (e->button() != Qt::LeftButton)
return;
m_startSize = m_curSize = m_resizable->size();
m_startPos = m_curPos = m_resizable->mapFromGlobal(e->globalPos());
if (debugSizeHandle)
qDebug() << "SizeHandleRect::mousePressEvent" << m_startSize << m_startPos << m_curPos;
}
void SizeHandleRect::mouseMoveEvent(QMouseEvent *e)
{
if (!(e->buttons() & Qt::LeftButton))
return;
// Try resize with delta against start position.
// We don't take little deltas in consecutive move events as this
// causes the handle and the mouse cursor to become out of sync
// once a min/maxSize limit is hit. When the cursor reenters the valid
// areas, it will now snap to it.
m_curPos = m_resizable->mapFromGlobal(e->globalPos());
QSize delta = QSize(m_curPos.x() - m_startPos.x(), m_curPos.y() - m_startPos.y());
switch (m_dir) {
case Right:
case RightTop: // Only width
delta.setHeight(0);
break;
case RightBottom: // All dimensions
break;
case LeftBottom:
case Bottom: // Only height
delta.setWidth(0);
break;
default:
delta = QSize(0, 0);
break;
}
if (delta != QSize(0, 0))
tryResize(delta);
}
void SizeHandleRect::mouseReleaseEvent(QMouseEvent *e)
{
if (e->button() != Qt::LeftButton)
return;
e->accept();
if (m_startSize != m_curSize) {
const QRect startRect = QRect(0, 0, m_startPos.x(), m_startPos.y());
const QRect newRect = QRect(0, 0, m_curPos.x(), m_curPos.y());
if (debugSizeHandle)
qDebug() << "SizeHandleRect::mouseReleaseEvent" << startRect << newRect;
emit mouseButtonReleased(startRect, newRect);
}
}
void SizeHandleRect::tryResize(const QSize &delta)
{
// Try resize with delta against start position
QSize newSize = m_startSize + delta;
newSize = newSize.expandedTo(m_resizable->minimumSizeHint());
newSize = newSize.expandedTo(m_resizable->minimumSize());
newSize = newSize.boundedTo(m_resizable->maximumSize());
if (newSize == m_resizable->size())
return;
if (debugSizeHandle)
qDebug() << "SizeHandleRect::tryResize by (" << m_startSize << '+' << delta << ')' << newSize;
m_resizable->resize(newSize);
m_curSize = m_resizable->size();
}
void SizeHandleRect::setState(SelectionHandleState st)
{
if (st == m_state)
return;
switch (st) {
case SelectionHandleOff:
hide();
break;
case SelectionHandleInactive:
case SelectionHandleActive:
show();
raise();
break;
}
m_state = st;
}
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