Widget-moveable-and-resizeable
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I want to present a widget which can be moved and at which it is possible to change the sizes. This widget can serve as the container for other widgets, such as to QLabel, QTableWidget and so on. This widget is used by me already in several projects. I hope it we will to you it is useful
mainwindow.h
/*
* Programmer Aleksey Osipov
* email: aliks-os@yandex.ru
*/
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "tcontainer.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
mainwindow.cpp
/*
* Programmer Aleksey Osipov
* email: aliks-os@yandex.ru
*/
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QLabel>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
this->showMaximized();
QLabel *lab1 = new QLabel("Label1");
QLabel *lab2 = new QLabel("Label2");
TContainer *con1 = new TContainer(this, QPoint(10, 10), lab1);
TContainer *con2 = new TContainer(this, QPoint(20, 50),lab2);
}
MainWindow::~MainWindow() {
delete ui;
}
tcontainer.h
/*
* Programmer Aleksey Osipov
* email: aliks-os@yandex.ru
*/
#ifndef TCONTAINER_H
#define TCONTAINER_H
#include <QWidget>
#include <QMouseEvent>
#include <QtGui>
#include <QVBoxLayout>
#include <QMenu>
enum modes{
NONE = 0,
MOVE = 1,
RESIZETL = 2,
RESIZET = 3,
RESIZETR = 4,
RESIZER = 5,
RESIZEBR = 6,
RESIZEB = 7,
RESIZEBL = 8,
RESIZEL = 9
};
class TContainer : public QWidget {
Q_OBJECT
public:
TContainer(QWidget *parent, QPoint p, QWidget *cWidget = 0);
~TContainer();
QWidget *childWidget;
QMenu *menu;
void setChildWidget(QWidget *cWidget);
protected:
int mode;
QPoint position;
QVBoxLayout* vLayout;
void setCursorShape(const QPoint &e_pos);
bool eventFilter(QObject *obj, QEvent *evt);
void keyPressEvent(QKeyEvent*);
void focusInEvent(QFocusEvent*);
void focusOutEvent(QFocusEvent*);
void mousePressEvent(QMouseEvent*);
void mouseReleaseEvent(QMouseEvent*);
void mouseMoveEvent(QMouseEvent *);
bool m_infocus;
bool m_showMenu;
bool m_isEditing;
void popupShow(const QPoint &pt);
QWidget *clone();
signals:
void inFocus(bool mode);
void outFocus(bool mode);
void newGeometry(QRect rect);
};
#endif // TCONTAINER_H
tcontainer.cpp
#include "tcontainer.h"
#include <QApplication>
TContainer::TContainer(QWidget *parent, QPoint p, QWidget *cWidget) : QWidget(parent) {
mode = NONE;
childWidget = cWidget;
setAttribute(Qt::WA_DeleteOnClose);
this->setVisible(true);
this->setAutoFillBackground(false);
this->setMouseTracking(true);
this->setFocusPolicy(Qt::ClickFocus);
this->setFocus();
this->move(p);
vLayout = new QVBoxLayout(this);
if (cWidget != 0) {
cWidget->setParent(this);
cWidget->releaseMouse();
cWidget->setAttribute(Qt::WA_TransparentForMouseEvents, true);
vLayout->addWidget(cWidget);
vLayout->setContentsMargins(0, 0, 0, 0);
}
this->setLayout(vLayout);
m_infocus = true;
m_showMenu = false;
m_isEditing = true;
this->installEventFilter(parent);
}
TContainer::~TContainer() {
delete vLayout;
}
void TContainer::setChildWidget(QWidget *cWidget) {
if (cWidget != 0) {
childWidget = cWidget;
childWidget->setAttribute(Qt::WA_TransparentForMouseEvents, true);
childWidget->setParent(this);
vLayout->addWidget(cWidget);
vLayout->setContentsMargins(0, 0, 0, 0);
}
}
void TContainer::popupShow(const QPoint &pt) {
if (menu->isEmpty()) return;
QPoint global = this->mapToGlobal(pt);
m_showMenu = true;
menu->exec(global);
m_showMenu = false;
}
void TContainer::focusInEvent(QFocusEvent *) {
m_infocus = true;
this->parentWidget()->installEventFilter(this);
this->parentWidget()->repaint();
emit inFocus(true);
}
void TContainer::focusOutEvent(QFocusEvent *) {
if (!m_isEditing) return;
if (m_showMenu) return;
mode = NONE;
emit outFocus(false);
m_infocus = false;
}
bool TContainer::eventFilter(QObject *obj, QEvent *evt) {
if (m_infocus) {
QWidget *w = this->parentWidget();
if (w == obj && evt->type() == QEvent::Paint) {
// Draw container selection
QPainter painter(w);
QPoint p = this->mapTo(w, QPoint(-3, -3));
QPoint LT = w->mapFrom(w, p);
QPoint LB = w->mapFrom(w, QPoint(p.x(), p.y() + this->height()));
QPoint RB = w->mapFrom(w, QPoint(p.x() + this->width(), p.y() + this->height()));
QPoint RT = w->mapFrom(w, QPoint(p.x() + this->width(), p.y()));
painter.fillRect(LT.x(), LT.y(), 6, 6, QColor("black"));
painter.fillRect(LB.x(), LB.y(), 6, 6, QColor("black"));
painter.fillRect(RB.x(), RB.y(), 6, 6, QColor("black"));
painter.fillRect(RT.x(), RT.y(), 6, 6, QColor("black"));
return QWidget::eventFilter(obj, evt);
}
}
return QWidget::eventFilter(obj, evt);
}
void TContainer::mousePressEvent(QMouseEvent *e) {
position = QPoint(e->globalX()-geometry().x(), e->globalY()-geometry().y());
if (!m_isEditing) return;
if (!m_infocus) return;
if (!e->buttons() && Qt::LeftButton) {
setCursorShape(e->pos());
return;
}
if(e->button() == Qt::RightButton) {
popupShow(e->pos());
e->accept();
}
}
void TContainer::keyPressEvent(QKeyEvent *e) {
if (!m_isEditing) return;
if (e->key() == Qt::Key_Delete) {
this->deleteLater();
}
// Moving container with arrows
if (QApplication::keyboardModifiers() == Qt::ControlModifier) {
QPoint newPos(this->x(),this->y());
if (e->key() == Qt::Key_Up) newPos.setY(newPos.y() - 1);
if (e->key() == Qt::Key_Down) newPos.setY(newPos.y() + 1);
if (e->key() == Qt::Key_Left) newPos.setX(newPos.x() - 1);
if (e->key() == Qt::Key_Right) newPos.setX(newPos.x() + 1);
move(newPos);
}
if (QApplication::keyboardModifiers() == Qt::ShiftModifier) {
if (e->key() == Qt::Key_Up) resize(width(), height() - 1);
if (e->key() == Qt::Key_Down) resize(width(), height() + 1);
if (e->key() == Qt::Key_Left) resize(width() - 1, height());
if (e->key() == Qt::Key_Right) resize(width() + 1, height());
}
emit newGeometry(this->geometry());
}
void TContainer::setCursorShape(const QPoint &e_pos) {
const int diff = 3;
if (
//Left-Bottom
((e_pos.y() > y() + height() - diff) && //Bottom
(e_pos.x() < x() + diff)) || //Left
//Right-Bottom
((e_pos.y() > y() + height() - diff) && //Bottom
(e_pos.x() > x() + width() - diff)) || //Right
//Left-Top
((e_pos.y() < y() + diff) && //Top
(e_pos.x() < x() + diff)) || //Left
//Right-Top
((e_pos.y() < y() + diff) && //Top
(e_pos.x() > x() + width() - diff)) //Right
)
{
//Left-Bottom
if ((e_pos.y() > y() + height() - diff) && //Bottom
(e_pos.x() < x() + diff)) //Left
{
mode = RESIZEBL;
setCursor(QCursor(Qt::SizeBDiagCursor));
}
//Right-Bottom
if ((e_pos.y() > y() + height() - diff) && //Bottom
(e_pos.x() > x() + width() - diff)) //Right
{
mode = RESIZEBR;
setCursor(QCursor(Qt::SizeFDiagCursor));
}
//Left-Top
if ((e_pos.y() < y() + diff) && //Top
(e_pos.x() < x() + diff)) //Left
{
mode = RESIZETL;
setCursor(QCursor(Qt::SizeFDiagCursor));
}
//Right-Top
if ((e_pos.y() < y() + diff) && //Top
(e_pos.x() > x() + width() - diff)) //Right
{
mode = RESIZETR;
setCursor(QCursor(Qt::SizeBDiagCursor));
}
}
// check cursor horizontal position
else if ((e_pos.x() < x() + diff) || //Left
((e_pos.x() > x() + width() - diff))) //Right
{
if (e_pos.x() < x() + diff) { //Left
setCursor(QCursor(Qt::SizeHorCursor));
mode = RESIZEL;
} else { //Right
setCursor(QCursor(Qt::SizeHorCursor));
mode = RESIZER;
}
}
// check cursor vertical position
else if (((e_pos.y() > y() + height() - diff)) || //Bottom
(e_pos.y() < y() + diff)) //Top
{
if (e_pos.y() < y() + diff) { //Top
setCursor(QCursor(Qt::SizeVerCursor));
mode = RESIZET;
} else { //Bottom
setCursor(QCursor(Qt::SizeVerCursor));
mode = RESIZEB;
}
} else {
setCursor(QCursor(Qt::ArrowCursor));
mode = MOVE;
}
}
void TContainer::mouseReleaseEvent(QMouseEvent *e) {
QWidget::mouseReleaseEvent(e);
}
void TContainer::mouseMoveEvent(QMouseEvent *e) {
QWidget::mouseMoveEvent(e);
if (!m_isEditing) return;
if (!m_infocus) return;
if (!e->buttons() && Qt::LeftButton) {
QPoint p = QPoint(e->x() + geometry().x(), e->y() + geometry().y());
setCursorShape(p);
return;
}
if ((mode == MOVE || mode == NONE) && e->buttons() && Qt::LeftButton) {
QPoint toMove = e->globalPos() - position;
if (toMove.x() < 0) return;
if (toMove.y() < 0) return;
if (toMove.x() > this->parentWidget()->width() - this->width()) return;
move(toMove);
emit newGeometry(this->geometry());
this->parentWidget()->repaint();
return;
}
if ((mode != MOVE) && e->buttons() && Qt::LeftButton) {
switch (mode){
case RESIZETL: { //Left-Top
int newwidth = e->globalX() - position.x() - geometry().x();
int newheight = e->globalY() - position.y() - geometry().y();
QPoint toMove = e->globalPos() - position;
resize(this->geometry().width() - newwidth, this->geometry().height() - newheight);
move(toMove.x(), toMove.y());
break;
}
case RESIZETR: { //Right-Top
int newheight = e->globalY() - position.y() - geometry().y();
QPoint toMove = e->globalPos() - position;
resize(e->x(), this->geometry().height() - newheight);
move(this->x(), toMove.y());
break;
}
case RESIZEBL: { //Left-Bottom
int newwidth = e->globalX() - position.x() - geometry().x();
QPoint toMove = e->globalPos() - position;
resize(this->geometry().width() - newwidth, e->y());
move(toMove.x(), this->y());
break;
}
case RESIZEB: { //Bottom
resize(width(), e->y());
break;
}
case RESIZEL: { //Left
int newwidth = e->globalX() - position.x() - geometry().x();
QPoint toMove = e->globalPos() - position;
resize(this->geometry().width() - newwidth, height());
move(toMove.x(), this->y());
break;
}
case RESIZET: { //Top
int newheight = e->globalY() - position.y() - geometry().y();
QPoint toMove = e->globalPos() - position;
resize(width(), this->geometry().height() - newheight);
move(this->x(), toMove.y());
break;
}
case RESIZER: { //Right
resize(e->x(), height());
break;
}
case RESIZEBR: { //Right-Bottom
resize(e->x(), e->y());
break;
}
}
this->parentWidget()->repaint();
}
emit newGeometry(this->geometry());
}