QScrollArea

[sabeesh]

Hi
I have a cod like this,

QIcon icon;
QStringList files;
QStringList filters;
QString fileName;
int r, c;
filters << "snapshot-*" ;
QDir directory;
directory.setNameFilters(filters);
files = directory.entryList(filters, QDir::Files | QDir::NoSymLinks);
NumStates_New=0;
NumStates_New = files.size()/3;
if ( files.size()%3 >0 ) NumStates_New++;
QLabel *pixmapLabels [NumStates_New] [3];
QScrollArea *scrollArea = new QScrollArea ( SnapWindow );
scrollArea->setBackgroundRole(QPalette::Dark);
scrollArea->setGeometry(5,5, 340, 550);

SnapLayout = new QGridLayout(scrollArea);
for (int i = 0; i < NumStates_New; ++i) {
for (int j = 0; j < 3; ++j) {
pixmapLabels[i][j] = createPixmapLabel();
SnapLayout->addWidget(pixmapLabels[i][j], i + 1, j + 1 );
} }

QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(SnapWindow);
r=0, c=0;
for (int i = 0; i < files.size(); ++i) {
fileName = files.at(i).toLocal8Bit().constData();
QImage image(fileName);
if (!image.isNull())
icon.addPixmap(QPixmap::fromImage(image), QIcon::Active, QIcon::On);
this->icon = icon;
this->size = QSize(128,128);
QPixmap pixmap = icon.pixmap(size, QIcon::Active, QIcon::On);
pixmapLabels[r][c]->setPixmap(pixmap);
c++;
if (c>=3) {
c=0; r++;
} }


It display all the pictures in a widget. I need a scrolbar for the QScrollArea. In this code the scroll bar not display, and all pictures shrink to that QScrollArea. Please help me for adding a scrollbar in this code.

[jpn]

Install "SnapLayout" on plain QWidget, and set it inside the scroll are via QScrollArea::setWidget() after you have fully constructed the layout.

[sabeesh]

Hi,
I try it like this,
SnapLayout = new QGridLayout(SnapWindow);
QWidget *ScrAr = new QWidget(SnapLayout);

but it display some errors like this

error: no matching function for call to ‘QWidget::QWidget(QGridLayout*&)’
/usr/local/Trolltech/Qt-4.3.0/include/QtGui/qwidget.h:702: note: candidates are: QWidget::QWidget(const QWidget&)
/usr/local/Trolltech/Qt-4.3.0/include/QtGui/qwidget.h:647: note: QWidget::QWidget(QWidgetPrivate&, QWidget*, Qt::WindowFlags)
/usr/local/Trolltech/Qt-4.3.0/include/QtGui/qwidget.h:199: note: QWidget::QWidget(QWidget*, const char*, Qt::WindowFlags)
/usr/local/Trolltech/Qt-4.3.0/include/QtGui/qwidget.h:197: note: QWidget::QWidget(QWidget*, Qt::WindowFlags)


Please help me to solve this prons.

[jpn]

QWidget *widget = new QWidget(scrollArea);
SnapLayout = new QGridLayout(widget);
// ...after you have added labels and set images
scrollArea->setWidget(widget);

[sabeesh]

Hi,
I modify my code like this, but now it doesn't display anything.
Please help me

Camframe4 = new QFrame(this);
Camframe4->setObjectName(QString::fromUtf8("Camframe4"));
Camframe4->setGeometry(QRect(368, 10, 365, 310));
Camframe4->setFrameShape(QFrame::StyledPanel);
Camframe4->setFrameShadow(QFrame::Raised);
QLabel *pixmapLabels [4] [3];
QScrollArea *scrollArea = new QScrollArea ( Camframe4 );
QWidget *widget = new QWidget(scrollArea);
SnapLayout = new QGridLayout(widget);

for (int i = 0; i < 4; ++i) {
for (int j = 0; j < 3; ++j) {
pixmapLabels[i][j] = createPixmapLabel();
SnapLayout->addWidget(pixmapLabels[i][j], i + 1, j + 1 );
}
}

QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(SnapWindow);

r=0, c=0;
QPixmap pixmap ;
for (int i = 0; i < files.size(); ++i) {
fileName = files.at(i).toLocal8Bit().constData();

QImage image(fileName);
if (!image.isNull())
icon.addPixmap(QPixmap::fromImage(image), QIcon::Normal, QIcon::On);

this->icon = icon;
this->size = QSize(100,100);
QPixmap pixmap = icon.pixmap(size, QIcon::Normal, QIcon::On);
pixmapLabels[r][c]->setPixmap(pixmap);
c++;
if (c>=3) {
c=0; r++;
}
}

scrollArea->setWidget(widget);

[jpn]

Are scrollArea and Camframe4 in layouts?

[sabeesh]

Hi,
I have a frame named as Camframe4 and I need to display the phots in that frame in a ScrollArea.

[sabeesh]

Hi,
I again modify that code like this,
I create a class like this

ImageViewer.h
-----------------------
class CImageView : public QWidget
{
Q_OBJECT
private:
enum { NumModes = 4, NumStates = 2 };
QStringList files;
QStringList filters;
QString fileName;
QDir directory;
QPixmap pixmap ;
int r, c, NumStates_New;
QLabel *pixmapLabels[NumModes][NumStates];
QGridLayout *SnapLayout;
QIcon icon;
QSize size;
public:
CImageView(QWidget *parent = 0);
void LoadImages();
void ShowImages();
QLabel *createPixmapLabel();
};

----------------------------------------------------------
ImageViewer.cpp
----------------------------------

#include "ImageView.h"
CImageView::CImageView(QWidget *parent) : QWidget(parent)
{
}
void CImageView::LoadImages(){

filters << "snapshot-*" ;
directory.setNameFilters(filters);
files = directory.entryList(filters, QDir::Files | QDir::NoSymLinks);
NumStates_New=0;
NumStates_New = files.size()/3;
SnapLayout = new QGridLayout(this);

if ( files.size()%3 >0 ) NumStates_New++;

QLabel *pixmapLabels [NumStates_New] [3];

for (int i = 0; i < NumStates_New; ++i) {
for (int j = 0; j < 3; ++j) {
pixmapLabels[i][j] = createPixmapLabel();
SnapLayout->addWidget(pixmapLabels[i][j], i + 1, j + 1 );
}
}

r=0, c=0;
for (int i = 0; i < files.size(); ++i) {
fileName = files.at(i).toLocal8Bit().constData();
QImage image(fileName);
if (!image.isNull())
icon.addPixmap(QPixmap::fromImage(image), QIcon::Normal, QIcon::On);
this->icon = icon;
this->size = QSize(100,100);
QPixmap pixmap = icon.pixmap(size, QIcon::Normal, QIcon::On);
pixmapLabels[r][c]->setPixmap(pixmap);
c++; if (c>=3) { c=0; r++; }
}
}

void CImageView::ShowImages(){

}

QLabel *CImageView::createPixmapLabel()
{
QLabel *label = new QLabel;
label->setEnabled(true);
label->setAlignment(Qt::AlignCenter);
label->setFrameShape(QFrame::Box);
label->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
label->setBackgroundRole(QPalette::Base);
label->setAutoFillBackground(true);
label->setMinimumSize(100, 13);
return label;
}

-----------------------------------------------

And in my program I call this class like this,

CImageView *ImageWid = new CImageView (this);
ImageWid->LoadImages();
ImageWid->setGeometry(QRect(375, 10, 345, 520));

Then it display all the pictures, but I can't see some pictures due to the window's size is smaller than the "ImageWid". So I need to add a scrollbar. I use QScrollArea like this,

QScrollArea *scrollArea = new QScrollArea;
QWidget *widget = new QWidget(scrollArea);
widget->setGeometry(QRect(375, 10, 345, 520));
CImageView *ImageWid = new CImageView ;
ImageWid->LoadImages();
ImageWid->setGeometry(QRect(1, 1, 345, 520));
scrollArea->setWidget(widget);

then, it doesn't display any errors. But at runtime, it doesn't display any pictures.
Please help me to solve this probs.