game-client/source/gui/GUI.cpp

#include <gui/GUI.h>
#include <ui_GUI.h>
#include <QDebug>

GUI::GUI(QWidget *parent) :
    QMainWindow(parent, Qt::Window | Qt::FramelessWindowHint),
    ui_(new Ui::GUI), dx_(-100000), dy_(-100000)
{
    ui_->setupUi(this);
    setWindowTitle("Супер-мега-клёвая-игрушка-название-которой-мы-ещё-не-придумали");
}

GUI::~GUI()
{
    delete ui_;
}

QWidget* GUI::mainContentScene() {
    return ui_->main_content_;
}


void GUI::mouseMoveEvent( QMouseEvent* e ) {
    if( e->buttons() | Qt::LeftButton ) {
        QPoint pt=mapFromGlobal(QCursor::pos());

        if (dx_ != -100000 && dy_ != -100000)
            setGeometry(pos().x() + ( pt.x() - dx_ ), pos().y() + ( pt.y() - dy_ ), width(), height());
    }
}

void GUI::mousePressEvent( QMouseEvent* e ) {
    if(e->button() == Qt::LeftButton) {
        QPoint pt = mapFromGlobal(QCursor::pos());
        QWidget* child=childAt(pt);

        if (child == 0) {
            dx_ = -100000;
            dy_ = -100000;
            return;
        }

        QString cname = child->objectName();
        if (cname == "window_top_border_" || cname == "window_bottom_border_"
                || cname == "window_topleft_border_" || cname == "window_topright_border_"
                || cname == "window_right_border_" || cname == "window_left_border_"
                || cname == "window_botright_border_" || cname == "window_botleft_border_") {
            dx_ = pt.x();
            dy_ = pt.y();
        } else {
            dx_ = -100000;
            dy_ = -100000;
        }
    }
}

void GUI::mouseReleaseEvent( QMouseEvent* e ) {
    if( e->button() == Qt::LeftButton ) {
        dx_ = -100000;
        dy_ = -100000;
    }
}