[Qt-interest] How to add more items in QListWidget
Abhishek
abhishekworld at gmail.com
Mon Jan 3 06:09:35 CET 2011
On Mon, Jan 3, 2011 at 10:29 AM, Siddu Hallikeri <siddugh at gmail.com> wrote:
> Hi Abhishek,
>
> Here is the delegate painter code
>
> Actually the requirement is
>
> I get the data from the server, after parsing I get 3 Strings, one for
> 'title' , one for 'Description' and one string for image as URL.
>
> I display the title and Description, first and I down load the image from
> the url and add it cell (like I am displaying the data (text) as I get and
> then image)
>
> So I used the Custom Cell, so that I gave URL to that cell and it downloads
> in it.
>
> Does the paint method will draw all the items every time is add the item ?
>
>
> void ListDelegate::paint ( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const
>
> {
>
> QRect r = option.rect;
>
> //Color: #C4C4C4
>
> QPen linePen(QColor::fromRgb(211,211,211), 1, Qt::SolidLine);
>
> //Color: #005A83
>
> QPen lineMarkedPen(QColor::fromRgb(0,90,131), 1, Qt::SolidLine);
>
> //Color: #333
>
> QPen fontPen(QColor::fromRgb(51,51,51), 1, Qt::SolidLine);
>
> //Color: #fff
>
> QPen fontMarkedPen(Qt::white, 1, Qt::SolidLine);
>
> if(option.state & QStyle::State_Selected){
>
> QLinearGradient gradientSelected(r.left(),r.top(),r.left(),r.height()+r.top());
>
> gradientSelected.setColorAt(0.0, QColor::fromRgb(119,213,247));
>
> gradientSelected.setColorAt(0.9, QColor::fromRgb(27,134,183));
>
> gradientSelected.setColorAt(1.0, QColor::fromRgb(0,120,174));
>
> painter->setBrush(gradientSelected);
>
> painter->drawRect(r);
>
> //BORDER
>
> painter->setPen(lineMarkedPen);
>
> painter->drawLine(r.topLeft(),r.topRight());
>
> painter->drawLine(r.topRight(),r.bottomRight());
>
> painter->drawLine(r.bottomLeft(),r.bottomRight());
>
> painter->drawLine(r.topLeft(),r.bottomLeft());
>
> painter->setPen(fontMarkedPen);
>
> } else {
>
> //BACKGROUND
>
> //ALTERNATING COLORS
>
> painter->setBrush( (index.row() % 2) ? Qt::white : QColor(252,252,252) );
>
> painter->drawRect(r);
>
> //BORDER
>
> painter->setPen(linePen);
>
> painter->drawLine(r.topLeft(),r.topRight());
>
> painter->drawLine(r.topRight(),r.bottomRight());
>
> painter->drawLine(r.bottomLeft(),r.bottomRight());
>
> painter->drawLine(r.topLeft(),r.bottomLeft());
>
> painter->setPen(fontPen);
>
> }
>
> //GET TITLE, DESCRIPTION
>
> QIcon *ic=new QIcon(QPixmap(":/home.png"));
>
> QString title = index.data(Qt::DisplayRole).toString();
>
> QString description = index.data(Qt::UserRole + 1).toString();
>
>
> //Icon
>
> if (!ic->isNull()) {
>
> //ICON
>
> r = option.rect.adjusted(0, 0, -10, -10);
>
> ic->paint(painter, r, Qt::AlignVCenter|Qt::AlignLeft);
>
> }
>
> Is Icon is that image you are downloading and painting ?
>
>
> int imageSpace = 10;
>
> if(!description.isNull())
>
> {
>
> //TItle
>
> r = option.rect.adjusted(100, 0, -10, -30);
>
> painter->setFont( QFont( "Lucida Grande",r.height()-30, QFont::Bold ) );
>
> painter->drawText(r.left(), r.top(), r.width(), r.height(), Qt::AlignBottom|Qt::AlignLeft, title, &r);
>
>
> //DESCRIPTION
>
> r = option.rect.adjusted(100, 0, -10, -30);
>
> painter->setFont( QFont( "Lucida Grande",r.height()-30, QFont::Normal ) );
>
> //painter->drawText(r.left(), r.top(), r.width(), r.height(), Qt::AlignLeft, description, &r);
>
> painter->drawText(r, Qt::AlignCenter, description);
>
> }
>
>
> And when ever you want to show text/image normally always check for the
DisplayRole that the one which shows all that in normal way ,
>
> Thanks,
> Siddu
>
> On Mon, Jan 3, 2011 at 10:08 AM, Abhishek <abhishekworld at gmail.com> wrote:
>
>>
>> Can you please share the Delegate code that way We can help you more .
>> NOTE: Please keep Qt-interest at qt.nokia.com in cc or every mail easy way
>> is to use replay all option and reply to mail in malling list :).
>>
>> On Mon, Jan 3, 2011 at 7:05 AM, Siddu Hallikeri <siddugh at gmail.com>wrote:
>>
>>> Hi Abhishek,
>>>
>>> Thanks for reply
>>>
>>> I tried with delegates by overriding the paint method
>>> but, view is flickring..
>>>
>>>
>>> On Mon, Jan 3, 2011 at 12:18 AM, Abhishek <abhishekworld at gmail.com>wrote:
>>>
>>>> Why dont you try using Delegates not sure about your case but making new
>>>> Cell every time is not a good idea ..
>>>>
>>>> On Sun, Jan 2, 2011 at 11:00 PM, Siddu Hallikeri <siddugh at gmail.com>wrote:
>>>>
>>>>>
>>>>> Hi all,
>>>>>
>>>>> How to add more items in QListWidget ?
>>>>>
>>>>> Below is the code I am using, it gives error as "memory full" in device
>>>>> (N8)
>>>>>
>>>>> void gotItem(IndividualSearchData *item)
>>>>> {
>>>>>
>>>>> Cell* cell = new Cell();
>>>>> cell->setTitle(item->m_Title);
>>>>> cell->setDescription(item->m_ShortDescription);
>>>>> cell->setImage(item->m_IconURL);
>>>>>
>>>>> connect(cell,SIGNAL(imageButtonClicked(QPixmap)),this,SLOT(previewImage(QPixmap)));
>>>>> QListWidgetItem *dataItem= new QListWidgetItem(ui->listWidget);
>>>>>
>>>>> dataItem->setSizeHint(QSize(430,189));
>>>>> ui->listWidget->addItem(dataItem);
>>>>> ui->listWidget->setItemWidget(dataItem,cell);
>>>>>
>>>>> }
>>>>>
>>>>>
>>>>> Cell is a sub class of of QWidget and contains three labels "title",
>>>>> "discription" and pass url as parameter.
>>>>>
>>>>> The cell download the image from this url.
>>>>>
>>>>> The gotItem method is called for about 400-500 times(whenever we get
>>>>> data from server)
>>>>>
>>>>> I checked with memory, it keeps on increasing, but how to reduce this ?
>>>>>
>>>>> Please let me know how to achieve this.
>>>>>
>>>>>
>>>>> Even I checked with 150 of items and stopped downloading image , still
>>>>> it takes lot of memory
>>>>>
>>>>> Thanks in advance
>>>>>
>>>>> siddu
>>>>> --
>>>>> Siddu Hallikeri
>>>>>
>>>>> _______________________________________________
>>>>> Qt-interest mailing list
>>>>> Qt-interest at qt.nokia.com
>>>>> http://lists.qt.nokia.com/mailman/listinfo/qt-interest
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Abhishek Patil
>>>> URL: http://thezeroth.net
>>>> "Imagination is more important than knowledge..." -Albert Einstein
>>>>
>>>
>>>
>>>
>>> --
>>> Siddu Hallikeri
>>>
>>
>>
>>
>> --
>> Abhishek Patil
>> URL: http://thezeroth.net
>> "Imagination is more important than knowledge..." -Albert Einstein
>>
>
>
>
> --
> Siddu Hallikeri
>
--
Abhishek Patil
URL: http://thezeroth.net
"Imagination is more important than knowledge..." -Albert Einstein
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