My C++ code(use opencv and qt):
face_detect::face_detect(QWidget *parent)
: QWidget(parent)
{
imgwidget = new showwidget("D:\\sample.avi");
imgwidget->resize(QSize(640,480));
setWindowTitle(tr("Face Detection!"));
FaceNumLabel = new QLabel(tr("face_num： "));
num = new QLabel;
num->setFrameStyle(QFrame::Panel | QFrame::Sunken);
ImgSource = new QLabel(tr("image source： "));
VedioBtn = new QPushButton(tr("from vedio"));
LocalImgBtn = new QPushButton(tr("local image"));
LeftLayout = new QVBoxLayout();
LeftLayout->addWidget(imgwidget);
LeftLayout->addWidget(FaceNumLabel);
LeftLayout->addWidget(num);
//LeftLayout->addWidget(ShowImageLabel, 3, 0, 1, 2);
RightLayout = new QVBoxLayout();
RightLayout->addWidget(ImgSource);
RightLayout->addWidget(VedioBtn);
RightLayout->addWidget(LocalImgBtn);
RightLayout->addWidget(ImgSource);
QHBoxLayout *mainLayout = new QHBoxLayout(this);
mainLayout->addLayout(LeftLayout);
mainLayout->addLayout(RightLayout);
mainLayout->setSizeConstraint(QLayout::SetFixedSize);
connect(VedioBtn, SIGNAL(clicked()), this, SLOT(openvedio()));
connect(LocalImgBtn, SIGNAL(clicked()), this, SLOT(localimg()));
}
I call widget.resize() to resize the widget, and then add it to the layout. But when I run the program, the showimgwidget's is not 640*480. Why is that?
Related
How to add a subwindow inside QPlainTextEdit?
I try it:
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
this->setFixedSize(800,600);
mainW = new QWidget(this);
mainW->setGeometry(0,0, 800, 600);
QGridLayout* lay = new QGridLayout(mainW);
QPlainTextEdit* te = new QPlainTextEdit(mainW);
QPlainTextEdit* te2 = new QPlainTextEdit(mainW);
mdiArea = new QMdiArea(te);
QWidget *widget = new QWidget(mdiArea);
QGridLayout *gridLayout = new QGridLayout(widget);
widget->setLayout(gridLayout);
QLabel *label = new QLabel("Hello, I am sub window!!!", widget);
gridLayout->addWidget(label);
mdiArea->addSubWindow(widget);
widget->setWindowTitle("Sub Window");
widget->show();
}
Layout of subwindow overlaps a QPlainTextEdit. How can you avoid this?
I want to add a QLineEdit to a QTabWidget but I always get a
Segmentation fault, SIGSEGV
I did it the following way:
QHBoxLayout *layout = new QHBoxLayout;
QWidget *Tab = new QWidget(ui->tabWidget);
ui->tabWidget->addTab(Tab, "Tab1");
Tab->setLayout(layout);
QLineEdit *lE = new QLineEdit();
lE->setObjectName("Text");
lE->setText("Hello");
ui->tabWidget->widget(0)->layout()->addWidget(lE);
This way works for adding a QPushButton but somehow it doesn't work for a QLineEdit.
you can add a widget to a cell
example:
//
QWidget* pWidget = new QWidget();
QLineEdit* foo = new QLineEdit(this);
foo->setText("Edit");
QHBoxLayout* pLayout = new QHBoxLayout(pWidget);
pLayout->addWidget(foo);
pLayout->setAlignment(Qt::AlignCenter);
pLayout->setContentsMargins(0, 0, 0, 0);
pWidget->setLayout(pLayout);
this->ui->myTable->setCellWidget(1, 1, pWidget);
I want to do serial communication in the QT inside, according to the number of serial ports to dynamically generate label, LineEdit, Button, and these three buttons can pull down the scroll bar when the size of the interface, how to do well, I write this below is dead of.
The effect of encapsulation into a method
The interface was washed last
Define QGridLayout insude QScrollArea. And add your new widgets into
that layout in code. QGridLayout::addWidget
Define table where you will show several widgets in table cells. That real complicated way.
void BaseUi::BaseScrollArea()
{
QScrollArea *pArea = new QScrollArea();
QWidget *pWidget = new QWidget();
pWidget->setStyleSheet("QWidget" "{background:white;}");
m_vbox_layout = new QVBoxLayout();
m_vbox_layout->addSpacerItem(new QSpacerItem(100, 30,
QSizePolicy::Expanding, QSizePolicy::Expanding));
pWidget->setLayout(m_vbox_layout);
pArea->setWidget(pWidget);
pArea->setWidgetResizable(true);
m_main_layout = new QVBoxLayout();
m_main_layout->addWidget(pArea);
}
void BaseUi::addAutoRecordUi(QString lab_neme, QString ledit_name)
{
QWidget *page = new QWidget;
QGridLayout *layout = new QGridLayout(page);
QLabel *label = new QLabel;
label->setText(lab_neme);
label->setFont(font());
QLineEdit *ledit = new QLineEdit;
ledit->setText(ledit_name);
ledit->setFont(font());
layout->addWidget(label, 0, 1);
layout->addWidget(ledit, 0, 2);
page->setLayout(layout);
m_vbox_layout->insertWidget(m_vbox_layout->count()-1, page);
}
void BaseUi::addMulRecordUi(QString lab_neme, QString ledit_name, QString
but_name)
{
QWidget *page = new QWidget;
QGridLayout *layout = new QGridLayout(page);
QLabel *label = new QLabel;
label->setText(lab_neme);
label->setFont(font());
QLineEdit *ledit = new QLineEdit;
ledit->setText(ledit_name);
ledit->setFont(font());
QPushButton *but = new QPushButton(but_name);
but->setFont(font());
layout->addWidget(label, 0, 1);
layout->addWidget(ledit, 0, 2);
layout->addWidget(but, 0, 3);
page->setLayout(layout);
m_vbox_layout->insertWidget(m_vbox_layout->count()-1, page);
}
I am new to here.
The ui run well ,but when I click 'okbtn' ...
QObject::connect: No such slot QWidget::makeyourbox() in occQt.cpp:324
And when I click 'cancelbtn', it runs.
Thanks for any responses,
Eason
code:
void occQt::about2() //UI
{
QWidget* pWidget = new QWidget;
QLabel* longlabel = new QLabel(tr("long"));
QLabel* widthlabel = new QLabel(tr("width"));
QLabel* highlabel = new QLabel(tr("high"));
longlineedit = new QLineEdit;
widthlineedit = new QLineEdit;
highlineedit = new QLineEdit;
QPushButton* okbtn = new QPushButton(tr("ok"));
QPushButton* cancelbtn = new QPushButton(tr("cancel"));
QGridLayout* gridlayout = new QGridLayout;
QVBoxLayout* dlglayout = new QVBoxLayout;
QHBoxLayout* btnlayout = new QHBoxLayout;
gridlayout->addWidget(longlabel, 0, 0, 1, 1);
gridlayout->addWidget(widthlabel, 1, 0, 1, 1);
gridlayout->addWidget(highlabel, 2, 0, 1, 1);
gridlayout->addWidget(longlineedit, 0, 1, 1, 3);
gridlayout->addWidget(widthlineedit, 1, 1, 1, 3);
gridlayout->addWidget(highlineedit, 2, 1, 1, 3);
longlineedit->setText("5");
widthlineedit->setText("5");
highlineedit->setText("5");
btnlayout->setSpacing(60);
btnlayout->addWidget(okbtn);
btnlayout->addWidget(cancelbtn);
//pWidget->setLayout(gridlayout);
dlglayout->setMargin(50);
dlglayout->addLayout(gridlayout);
dlglayout->addStretch(40);
dlglayout->addLayout(btnlayout);
pWidget->setLayout(dlglayout);
pWidget->setWindowTitle(tr("Make a Box by custom."));
pWidget->show();
connect(okbtn, SIGNAL(clicked()), pWidget, SLOT(makeyourbox()));
//QObject::connect(okbtn, SIGNAL(clicked()), pWidget, SLOT(close()));
connect(cancelbtn, SIGNAL(clicked()), pWidget, SLOT(close()));
}
void occQt::makeyourbox()
{
QString string_a = longlineedit->text();
eason_a = string_a.toInt();
QString string_b = widthlineedit->text();
eason_b = string_b.toInt();
QString string_c = highlineedit->text();
eason_c = string_c.toInt();
TopoDS_Shape aTopoBox = BRepPrimAPI_MakeBox(eason_a, eason_b, eason_c).Shape();
Handle_AIS_Shape anAisBox = new AIS_Shape(aTopoBox);
anAisBox->SetColor(Quantity_NOC_AZURE);
mContext->Display(anAisBox);
}
When I run the pWidget, click cancelbtn, ui close.
Click okbtn,do nothing..
pWidget is a generic QWidget. It does not contain method/slot makeyourbox().
Your code is faulty.
you should add makeyourbox() method to the subclass of QWidget, and mark it as slot
Double check makeyourbox is defined to be a slot within that class.
I had a console-game that was written on c++ and since I am currently trying to learn Qt I decided to add GUI to this program as an exercise.
So there's main window named "gui" that inherits Qwidget. It has layout QHBoxLayout* main_h_lo. Which has 2 added layouts: 1. QStackedLayout* leftpart, 2. QGridLayout* deck. The first is some sort of menu-part. It has 4 different widgets with their layouts. For example choosing game mode or printing game score. And second layout - deck - is game table, similar to chessboard.
There's constructor code which I suppose contains the problem:
gui::gui(QWidget *parent) :
QWidget(parent), pgame(nullptr)
{
QHBoxLayout* main_h_lo = new QHBoxLayout;
main_h_lo->setMargin(0);
main_h_lo->setSpacing(0);
setLayout(main_h_lo);
//leftpart-widgets initialization:
bot_or_playerW = new QWidget;
QVBoxLayout* bot_or_playerL = new QVBoxLayout;
bot_or_playerL->addWidget(new QLabel("Choose game mode"));
QPushButton* qpb1 = new QPushButton("vs Human");
QPushButton* qpb2 = new QPushButton("vs Bot");
QObject::connect(qpb1, SIGNAL(clicked()), SLOT(pvp()));
QObject::connect(qpb2, SIGNAL(clicked()), SLOT(pvb()));
bot_or_playerL->addWidget(qpb1);
bot_or_playerL->addWidget(qpb2);
bot_or_playerW->setLayout(bot_or_playerL);
choosing_colourW = new QWidget;
QVBoxLayout* choosing_colourL = new QVBoxLayout;
choosing_colourL->addWidget(new QLabel("Choose your colour"));
QPushButton* qpb3 = new QPushButton("white(2nd turn)");
QPushButton* qpb4 = new QPushButton("black(1st turn)");
QObject::connect(qpb3, SIGNAL(clicked()), SLOT(chwh()));
QObject::connect(qpb4, SIGNAL(clicked()), SLOT(chbl()));
choosing_colourL->addWidget(qpb3);
choosing_colourL->addWidget(qpb4);
choosing_colourW->setLayout(bot_or_playerL);
score_lturnW = new QWidget;
QVBoxLayout* score_lturnL = new QVBoxLayout;
lturn = new QLabel;
pturn = new QLabel;
score = new QLabel;
score_lturnL->addWidget(lturn);
score_lturnL->addWidget(pturn);
score_lturnL->addWidget(score);
score_lturnW->setLayout(score_lturnL);
after_gameW = new QWidget;
QVBoxLayout* after_gameL = new QVBoxLayout;
winner = new QLabel;
offer_to_play_again = new QLabel("Wanna play again?");
QPushButton* qpb5 = new QPushButton("yes");
QObject::connect(qpb5, SIGNAL(clicked()), SLOT(restart()));
QPushButton* qpb6 = new QPushButton("no");
QObject::connect(qpb6, SIGNAL(clicked()), qApp, SLOT(quit()));
after_gameW->setLayout(after_gameL);
leftpart = new QStackedLayout;
leftpart->addWidget(bot_or_playerW);
leftpart->addWidget(choosing_colourW);
leftpart->addWidget(score_lturnW);
leftpart->addWidget(after_gameW);
//"rightpart" init:
deck = new QGridLayout;
deck->setMargin(0);
deck->setSpacing(0);
e_pic = QPixmap("empty.png");
b_pic = QPixmap("black.png");
w_pic = QPixmap("white.png");
pic_sz = e_pic.size();
for (int i = 0; i < 8; ++i)
for (int j = 0; j < 8; ++j)
{
QPushButton* tqpb = new QPushButton;
tqpb->setIcon(e_pic);
tqpb->setIconSize(pic_sz);
std::stringstream ss;
std::string s;
ss << i << j;
ss >> s;
tqpb->setObjectName(s.c_str());
deck->addWidget(tqpb, i, j);
connect(tqpb, SIGNAL(clicked()), SLOT(turn_try()));
}
main_h_lo->addLayout(leftpart);
main_h_lo->addLayout(deck);
leftpart->setCurrentWidget(bot_or_playerW);
}
I get no error or warning. The deck part is scary and ugly but it is as expected :D. The "menu" part does not show up - that is the problem. Screen: http://i.imgur.com/Sh9PU9N.jpg .
Some comments about you code -
A layout can be given the parent on construction and it will automatically become the default layout. This saves you one command, but makes it more implicit. It all depends on what you prefer - implicit or explicit.
Loose the QObject::connect. A simple 'connect' will do.
Are you sure "black(1st turn)" is correct? In a conventional chess game, white generally goes first.
You can avoid std::stringstream and use QString::number instead.
The problem has already been mentioned by 'hyde'.