qt5base-lts/examples/widgets/tooltips/sortingbox.cpp

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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "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 Nokia Corporation and its Subsidiary(-ies) 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,
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
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****************************************************************************/
#include <QtWidgets>
#include <stdlib.h>
#include "sortingbox.h"
//! [0]
SortingBox::SortingBox()
{
//! [0] //! [1]
setMouseTracking(true);
//! [1] //! [2]
setBackgroundRole(QPalette::Base);
//! [2]
itemInMotion = 0;
//! [3]
newCircleButton = createToolButton(tr("New Circle"),
QIcon(":/images/circle.png"),
SLOT(createNewCircle()));
newSquareButton = createToolButton(tr("New Square"),
QIcon(":/images/square.png"),
SLOT(createNewSquare()));
newTriangleButton = createToolButton(tr("New Triangle"),
QIcon(":/images/triangle.png"),
SLOT(createNewTriangle()));
circlePath.addEllipse(QRect(0, 0, 100, 100));
squarePath.addRect(QRect(0, 0, 100, 100));
qreal x = trianglePath.currentPosition().x();
qreal y = trianglePath.currentPosition().y();
trianglePath.moveTo(x + 120 / 2, y);
trianglePath.lineTo(0, 100);
trianglePath.lineTo(120, 100);
trianglePath.lineTo(x + 120 / 2, y);
//! [3] //! [4]
setWindowTitle(tr("Tool Tips"));
resize(500, 300);
createShapeItem(circlePath, tr("Circle"), initialItemPosition(circlePath),
initialItemColor());
createShapeItem(squarePath, tr("Square"), initialItemPosition(squarePath),
initialItemColor());
createShapeItem(trianglePath, tr("Triangle"),
initialItemPosition(trianglePath), initialItemColor());
}
//! [4]
//! [5]
bool SortingBox::event(QEvent *event)
{
//! [5] //! [6]
if (event->type() == QEvent::ToolTip) {
QHelpEvent *helpEvent = static_cast<QHelpEvent *>(event);
int index = itemAt(helpEvent->pos());
if (index != -1) {
QToolTip::showText(helpEvent->globalPos(), shapeItems[index].toolTip());
} else {
QToolTip::hideText();
event->ignore();
}
return true;
}
return QWidget::event(event);
}
//! [6]
//! [7]
void SortingBox::resizeEvent(QResizeEvent * /* event */)
{
int margin = style()->pixelMetric(QStyle::PM_DefaultTopLevelMargin);
int x = width() - margin;
int y = height() - margin;
y = updateButtonGeometry(newCircleButton, x, y);
y = updateButtonGeometry(newSquareButton, x, y);
updateButtonGeometry(newTriangleButton, x, y);
}
//! [7]
//! [8]
void SortingBox::paintEvent(QPaintEvent * /* event */)
{
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing);
foreach (ShapeItem shapeItem, shapeItems) {
//! [8] //! [9]
painter.translate(shapeItem.position());
//! [9] //! [10]
painter.setBrush(shapeItem.color());
painter.drawPath(shapeItem.path());
painter.translate(-shapeItem.position());
}
}
//! [10]
//! [11]
void SortingBox::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton) {
int index = itemAt(event->pos());
if (index != -1) {
itemInMotion = &shapeItems[index];
previousPosition = event->pos();
shapeItems.move(index, shapeItems.size() - 1);
update();
}
}
}
//! [11]
//! [12]
void SortingBox::mouseMoveEvent(QMouseEvent *event)
{
if ((event->buttons() & Qt::LeftButton) && itemInMotion)
moveItemTo(event->pos());
}
//! [12]
//! [13]
void SortingBox::mouseReleaseEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton && itemInMotion) {
moveItemTo(event->pos());
itemInMotion = 0;
}
}
//! [13]
//! [14]
void SortingBox::createNewCircle()
{
static int count = 1;
createShapeItem(circlePath, tr("Circle <%1>").arg(++count),
randomItemPosition(), randomItemColor());
}
//! [14]
//! [15]
void SortingBox::createNewSquare()
{
static int count = 1;
createShapeItem(squarePath, tr("Square <%1>").arg(++count),
randomItemPosition(), randomItemColor());
}
//! [15]
//! [16]
void SortingBox::createNewTriangle()
{
static int count = 1;
createShapeItem(trianglePath, tr("Triangle <%1>").arg(++count),
randomItemPosition(), randomItemColor());
}
//! [16]
//! [17]
int SortingBox::itemAt(const QPoint &pos)
{
for (int i = shapeItems.size() - 1; i >= 0; --i) {
const ShapeItem &item = shapeItems[i];
if (item.path().contains(pos - item.position()))
return i;
}
return -1;
}
//! [17]
//! [18]
void SortingBox::moveItemTo(const QPoint &pos)
{
QPoint offset = pos - previousPosition;
itemInMotion->setPosition(itemInMotion->position() + offset);
//! [18] //! [19]
previousPosition = pos;
update();
}
//! [19]
//! [20]
int SortingBox::updateButtonGeometry(QToolButton *button, int x, int y)
{
QSize size = button->sizeHint();
button->setGeometry(x - size.rwidth(), y - size.rheight(),
size.rwidth(), size.rheight());
return y - size.rheight()
- style()->pixelMetric(QStyle::PM_DefaultLayoutSpacing);
}
//! [20]
//! [21]
void SortingBox::createShapeItem(const QPainterPath &path,
const QString &toolTip, const QPoint &pos,
const QColor &color)
{
ShapeItem shapeItem;
shapeItem.setPath(path);
shapeItem.setToolTip(toolTip);
shapeItem.setPosition(pos);
shapeItem.setColor(color);
shapeItems.append(shapeItem);
update();
}
//! [21]
//! [22]
QToolButton *SortingBox::createToolButton(const QString &toolTip,
const QIcon &icon, const char *member)
{
QToolButton *button = new QToolButton(this);
button->setToolTip(toolTip);
button->setIcon(icon);
button->setIconSize(QSize(32, 32));
connect(button, SIGNAL(clicked()), this, member);
return button;
}
//! [22]
//! [23]
QPoint SortingBox::initialItemPosition(const QPainterPath &path)
{
int x;
int y = (height() - (int)path.controlPointRect().height()) / 2;
if (shapeItems.size() == 0)
x = ((3 * width()) / 2 - (int)path.controlPointRect().width()) / 2;
else
x = (width() / shapeItems.size()
- (int)path.controlPointRect().width()) / 2;
return QPoint(x, y);
}
//! [23]
//! [24]
QPoint SortingBox::randomItemPosition()
{
return QPoint(qrand() % (width() - 120), qrand() % (height() - 120));
}
//! [24]
//! [25]
QColor SortingBox::initialItemColor()
{
return QColor::fromHsv(((shapeItems.size() + 1) * 85) % 256, 255, 190);
}
//! [25]
//! [26]
QColor SortingBox::randomItemColor()
{
return QColor::fromHsv(qrand() % 256, 255, 190);
}
//! [26]