How to make a simple PopupApplet

[Shantanu Tushar Jha]

On Sun, Jan 17, 2010 at 4:04 AM, Giulio Camuffo <giuliocamuffo at gmail.com>wrote:

> On Saturday 16 January 2010 21:12:41 Shantanu Tushar Jha wrote:
> > On Sat, Jan 16, 2010 at 5:08 PM, Giulio Camuffo
> <giuliocamuffo at gmail.com>wrote:
> > > On Saturday 16 January 2010 05:36:41 Shantanu Tushar Jha wrote:
> > > > Hello all,
> > > >
> > > >     I wanted to make a simple PopupApplet which stays as an icon in
> the
> > > >
> > > > panel and when clicked shows a popup allowing to enter username and
> > > > password. The techbase extenders tutorial seems a bit overkill for
> this
> > > > because it provides more functionality than what required in my case.
> > > > So, looking at the PopupApplet API, I wrote the following code -
> > > >
> > > > #include "sifyclient.h"
> > > > K_EXPORT_PLASMA_APPLET(sifyclient, SifyClient)
> > > >
> > > > SifyClient::SifyClient(QObject *parent, const QVariantList &args)
> > > >
> > > >     : Plasma::PopupApplet(parent, args)
> > > >
> > > > {
> > > >
> > > >     topLevelWidget = new QGraphicsWidget;
> > > >     usernameLabel = new Plasma::Label(topLevelWidget);
> > > >     usernameEdit = new Plasma::LineEdit(topLevelWidget);
> > > >
> > > >     usernameLabel->setText("Username");
> > > >
> > > >     QGraphicsLinearLayout *usernameLayout = new
> > > >
> > > > QGraphicsLinearLayout(Qt::Horizontal, topLevelWidget);
> > > >
> > > >     dataTransferLayout->addItem(usernameLabel);
> > > >     dataTransferLayout->addItem(usernameEdit);
> > > >
> > > >     topLevelWidget->setLayout(dataTransferLayout);
> > > >
> > > > }
> > > >
> > > > SifyClient::~SifyClient()
> > > > {
> > > >
> > > >     delete topLevelWidget;
> > > >
> > > > }
> > > >
> > > > void SifyClient::init()
> > > > {
> > > >
> > > >     setPopupIcon("device-notifier");    //just for testing, will
> > > >     replace
> > >
> > > by
> > >
> > > > appropriate one later
> > > > }
> > > >
> > > > QGraphicsWidget *SifyClient::graphicsWidget()
> > > > {
> > > >
> > > >     return topLevelWidget;
> > > >
> > > > }
> > > >
> > > > #include "sifyclient.moc"
> > > >
> > > >
> > > > From the API, I expected this to display 'device-notifier' icon when
> > >
> > > placed
> > >
> > > > in panel and show the username label and line edit when clicked.
> > > > Instead
> > >
> > > it
> > >
> > > > displays the label and line edit directly inside the panel. What am I
> > >
> > > doing
> > >
> > > > wrong? How to get the effect I'm trying to achieve?
> > > >
> > > > Thanks
> > >
> > > Try setting a a minimum size for the topLevelWidget. It should work
> that
> > > way.
> >
> > Thanks, that worked! I used 'topLevelWidget->setMinimumSize(250, 250);'
> in
> > the constructor and now it shows the icon in the panel.
> > But now, If I click the icon, nothing pops up. Only If I move the applet
> > from the panel to the desktop (when it shows the topLevelWidget with a
> > label and lineEdit inside it) and then move it back into the panel, the
> > popup shows on clicking the icon. Every time I do this, the following is
> > output to the terminal -
> >
> > plasma-desktop(5365)/plasma ItemSpace::resizeItem: Resizing
> QRectF(787,637
> > 32x32) to QRectF(787,637 278x278)
> >
> > Any idea what I'm missing?
> >
> > Thanks
> >
> > > _______________________________________________
> > > Plasma-devel mailing list
> > > Plasma-devel at kde.org
> > > https://mail.kde.org/mailman/listinfo/plasma-devel
>
> I had a similar problem, some time ago, and if I remeber correctly the
> problem
> was that the parent of graphicWidget() was 0. Try to change "topLevelWidget
> =
> new QGraphicsWidget;" with "topLevelWidget = new QGraphicsWidget(this);".
>

> On a side note it is better to instantiate those pointers in this way:
>

> SifyClient::SifyClient(QObject *parent, const QVariantList &args)
>    : Plasma::PopupApplet(parent, args),
>       topLevelWidget(new QGraphicsWidget(this)),
>      ...
> {
>

Yay! That worked :) Thanks a lot. I wonder If these things should be added
to the API reference or techbase somewhere. Should we add a "Creating a
Simple PopupApplet" tutorial to the techbase?

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-- 
Shantanu Tushar    (UTC +0530)
http://www.shantanutushar.com
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