gabbar0x
Reputation: 4246
How to take a screenshot of a bunch of labels and other trivial widgts in Qt and save it to a file at runtime?
Alright so i was working on a C++ project for school which required me to create an interactive timetable. So i implemented this in Qt and the implementation turned out to be quite successful.
I am now on the final stage where i want to take a screenshot of a particular part of the window which contains the timetable and store it as an image.
Now the problem is that this is not a single container. The entries are actually labels and i set attributes and wrote code for each of them individually. So i guess i cant use the Pixmap property to grab the widget or something as there is NO widget.
I need the part inside the border to be captured as an image and i want to store it on my PC as a jpeg file when the generate button is pressed. I know how to do the latter but how do i GET the image and store it?
Here is the code for the particular form/window. Not sure it will help but still..
#include "student_tt.h"
#include "ui_student_tt.h"
#include "dialog.h"
#include "QListWidgetItem"
#include "QListWidget"
#include "QLCDNumber"
#include <QString>
#include <string>
#include <QMessageBox>
void Student_TT::checkCredits()
{
int cnt=0;
if(!ui->m1->text().contains('-'))
{
cnt+=5;
}
if(!ui->m1_2->text().contains('-'))
{
cnt+=3;
}
if(!ui->m1_3->text().contains('-'))
{
cnt+=3;
}
if(!ui->m1_4->text().contains('-'))
{
cnt+=4;
}
if(!ui->m1_5->text().contains('-'))
{
cnt+=2;
}
QString x=QString::number(cnt);
ui->ccount->setText(x);
if(cnt>=10&&cnt<=15)
{
ui->tryx->setStyleSheet("QLabel {color : green}");
ui->gbutton->setEnabled(1);
}
else
{
ui->tryx->setStyleSheet("QLabel { color : red}");
ui->gbutton->setEnabled(0);
}
}
Student_TT::Student_TT(QWidget *parent) :
QDialog(parent),
ui(new Ui::Student_TT)
{
ui->setupUi(this);
}
Student_TT::~Student_TT()
{
delete ui;
}
void Student_TT::on_Student_TT_accepted(QString a,QString b,QString c)
{
ui->name->setText("NAME: "+a);
ui->reg->setText("REG.NO: "+b);
ui->stm->setText("STREAM: "+c);
}
void Student_TT::on_listWidget_itemClicked(QListWidgetItem *item)
{
if(item->isSelected())
{
QString a=ui->m1->text();
if(a!=item->text())
{
QString x1=item->text();
ui->sub1->setStyleSheet("QLabel {color : green; }");
ui->m1->setStyleSheet("QLabel {color : deepskyblue; }");
ui->w1->setStyleSheet("QLabel {color : deepskyblue; }");
ui->f1->setStyleSheet("QLabel {color : deepskyblue; }");//Setting colours to labels
ui->lab1->setStyleSheet("QLabel {color : deepskyblue; }");
ui->lab1_2->setStyleSheet("QLabel {color : deepskyblue; }");
ui->m1->setText(x1);//Setting text
ui->w1->setText(x1);
ui->f1->setText(x1);
ui->lab1->setText(x1+"L");
ui->lab1_2->setText(x1+"L");
}
else
{
ui->sub1->setStyleSheet("QLabel {color : black; }");
QString x1=ui->m1_8->text();//Unused
ui->m1->setStyleSheet("QLabel {color : green; }");
ui->w1->setStyleSheet("QLabel {color : green; }");
ui->f1->setStyleSheet("QLabel {color : green; }");//Setting colours to labels
ui->lab1->setStyleSheet("QLabel {color : green; }");
ui->lab1_2->setStyleSheet("QLabel {color : green; }");
ui->m1->setText(x1);//Setting text
ui->w1->setText(x1);
ui->f1->setText(x1);
ui->lab1->setText(x1);
ui->lab1_2->setText(x1);
}
}
checkCredits();//updating credits
}
void Student_TT::on_listWidget_2_itemClicked(QListWidgetItem *item)
{
if(item->isSelected())
{
QString a=ui->m1_2->text();//Its Physics
if(a!=item->text())
{
QString x1=item->text();
ui->sub2->setStyleSheet("QLabel {color : green; }");
ui->m1_2->setStyleSheet("QLabel {color : orange; }");
ui->tu1_2->setStyleSheet("QLabel {color : orange; }");
ui->th1_2->setStyleSheet("QLabel {color : orange; }");//Setting colours to labels
ui->lab2->setStyleSheet("QLabel {color : orange; }");
ui->lab21->setStyleSheet("QLabel {color : orange; }");
ui->m1_2->setText(x1);//Setting text
ui->tu1_2->setText(x1);
ui->th1_2->setText(x1);
ui->lab2->setText(x1+"L");
ui->lab21->setText(x1+"L");
}
else
{
QString x1=ui->m1_8->text();//Unused
ui->sub2->setStyleSheet("QLabel {color : black; }");
ui->m1_2->setStyleSheet("QLabel {color : green; }");
ui->tu1_2->setStyleSheet("QLabel {color : green; }");
ui->th1_2->setStyleSheet("QLabel {color : green; }");//Setting colours to labels
ui->lab2->setStyleSheet("QLabel {color : green; }");
ui->lab21->setStyleSheet("QLabel {color : green; }");
ui->m1_2->setText(x1);//Setting text
ui->tu1_2->setText(x1);
ui->th1_2->setText(x1);
ui->lab2->setText(x1);
ui->lab21->setText(x1);
}
}
checkCredits();//updating credits
}
void Student_TT::on_listWidget_3_itemClicked(QListWidgetItem *item)
{
if(item->isSelected())
{
QString a=ui->m1_3->text();//Its Chemistry
if(a!=item->text())
{
QString x1=item->text();
ui->sub3->setStyleSheet("QLabel {color : green; }");
ui->m1_3->setStyleSheet("QLabel {color : magenta; }");
ui->w1_3->setStyleSheet("QLabel {color : magenta; }");
ui->f1_3->setStyleSheet("QLabel {color : magenta; }");
ui->lab32->setStyleSheet("QLabel {color : magenta; }");
ui->lab33->setStyleSheet("QLabel {color : magenta; }");
ui->m1_3->setText(x1);//Setting text
ui->w1_3->setText(x1);
ui->f1_3->setText(x1);
ui->lab32->setText(x1+"L");
ui->lab33->setText(x1+"L");
}
else
{
QString x1=ui->m1_8->text();//Unused
ui->sub3->setStyleSheet("QLabel {color : black; }");
ui->m1_3->setStyleSheet("QLabel {color : green; }");
ui->w1_3->setStyleSheet("QLabel {color : green; }");
ui->f1_3->setStyleSheet("QLabel {color : green; }");//Setting colours to labels
ui->lab32->setStyleSheet("QLabel {color : green; }");
ui->lab33->setStyleSheet("QLabel {color : green; }");
ui->m1_3->setText(x1);//Setting text
ui->w1_3->setText(x1);
ui->f1_3->setText(x1);
ui->lab32->setText(x1);
ui->lab33->setText(x1);
}
}
checkCredits();//updating credits
}
void Student_TT::on_listWidget_4_itemClicked(QListWidgetItem *item)
{
if(item->isSelected())
{
QString a=ui->m1_4->text();//Maths
if(a!=item->text())
{
QString x1=item->text();
ui->sub4->setStyleSheet("QLabel {color : green; }");
ui->m1_4->setStyleSheet("QLabel {color : darkcyan; }");
ui->tu1_4->setStyleSheet("QLabel {color : darkcyan; }");
ui->th1_4->setStyleSheet("QLabel {color : darkcyan; }");
ui->lab43->setStyleSheet("QLabel {color : darkcyan; }");
ui->lab44->setStyleSheet("QLabel {color : darkcyan; }");
ui->m1_4->setText(x1);//Setting text
ui->tu1_4->setText(x1);
ui->th1_4->setText(x1);
ui->lab43->setText(x1+"L");
ui->lab44->setText(x1+"L");
}
else
{
QString x1=ui->m1_8->text();//Unused
ui->sub4->setStyleSheet("QLabel {color : black; }");
ui->m1_4->setStyleSheet("QLabel {color : green; }");
ui->tu1_4->setStyleSheet("QLabel {color : green; }");
ui->th1_4->setStyleSheet("QLabel {color : green; }");//Setting colours to labels
ui->lab43->setStyleSheet("QLabel {color : green; }");
ui->lab44->setStyleSheet("QLabel {color : green; }");
ui->m1_4->setText(x1);//Setting text
ui->tu1_4->setText(x1);
ui->th1_4->setText(x1);
ui->lab43->setText(x1);
ui->lab44->setText(x1);
}
}
checkCredits();//Updating Credits
}
void Student_TT::on_pushButton_clicked()//Information
{
QMessageBox::information(this,tr("Information"),tr("1. There will be credits for each course marked in '[]'\n2. Credits may be thought of as 'weightage'. More the credits, more important the subject will be.\n3. You must select a minimum of 10 credits and a maximum of 15 credits\n4. To select or change your course, just CLICK on the Course Code"));
}
void Student_TT::on_listWidget_5_itemClicked(QListWidgetItem *item)
{
if(item->isSelected())
{
QString a=ui->m1_5->text();//Maths
if(a!=item->text())
{
QString x1=item->text();
ui->sub5->setStyleSheet("QLabel {color : green; }");
ui->m1_5->setStyleSheet("QLabel {color : lime; }");
ui->f1_5->setStyleSheet("QLabel {color : lime; }");
ui->m1_5->setText(x1);//Setting text
ui->f1_5->setText(x1);
}
else
{
QString x1=ui->m1_8->text();//Unused
ui->sub5->setStyleSheet("QLabel {color : black;}");
ui->m1_5->setStyleSheet("QLabel {color : green;}");
ui->f1_5->setStyleSheet("QLabel {color : green;}");
ui->m1_5->setText(x1);//Setting text
ui->f1_5->setText(x1);
}
}
checkCredits();//Updating Credits
}
Notice that there are a a few componenets from other windows in the code but i guess the code doesn't really need to be understood. You can check each label being assigned colours in the 5 'ItemSelected' functions.
Upvotes: 2
Views: 201
Answers (3)
gabbar0x
Reputation: 4246
This works fine for me. I just settled with the complete screenshot.
QPixmap pixmap = QPixmap::grabWidget( w );
pixmap.save("*folder location*/*file name*.jpg");
Upvotes: 1
Valentin H
Reputation: 7448
Hope this helps. (Code not tested, but should give the idea, where to get the widget.)
activeWindow is your top-level widget.
#include <QApplication>
#include <QDesktopServices>
#include <QDateTime>
//...
//Somewhere in clicked-slot
QWidget * w = QApplication::activeWindow();
if(w)
{
QPixmap scrshot = QPixmap::grabWidget( w );
scrshot.save( QString("%1/%2.jpg")
.arg(QDesktopServices::storageLocation( QDesktopServices::DesktopLocation))
.arg( QDateTime::currentDateTime().toString("yyyymmddThhMMss"))
);
}
If you have designed the GUI with QtCreator, you can check the widget name in property editor and call e.g.
QPixmap::grabWidget( ui->myTableWidget );
Upvotes: 2
KernelPanic
Reputation: 2432
Take look at QWidget::grab method if you are using Qt 5.0 and above, otherwise take a look at QPixmap::grabWidget method.
If the widget has any children, then they are also painted in the appropriate positions.
Upvotes: 3
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