2008/12/30 Alexis Ménard <men...@kde.org> > Unfortunately you can't it is a bug in Qt. > > You can take a look to the task tracker of Qt Number 231114 and 211500. I > guess it is what you try to solve. The fix is in 4.4 branch (so scheduled > for 4.4.4) and in 4.5.
I still can't get this work even with latest Qt4.5. I've attached code of a sample plasmoid which demonstrate the problem. You are welcomed to try it out. Right click on the applet to modify its child widget size. > > > As a workaround you have to manage the resize of your applet by hand when > the size of the layout change. > The question is how can I do it? When the embedded QGraphicsWidget need to enlarge, say from 200x200 to 400x400, how can I decide what the applet size should be? > > 2008/12/30 Dong Tiger <idlecat...@gmail.com> > >> Hi, >> >> A QGraphicsWidget is embeded into Plasma::Applet through >> QGraphicsLinearLayout. When this QGraphicsWidget's size changes, how to get >> the applet's size adjusted accordingly? >> >> The code snippet looks like: >> >> child = new MyGraphicsWidget(applet); >> layout = new QGraphicsLinearLayout(applet); >> layout->setSpacing(0); >> layout->addItem(child); >> applet->setLayout(layout); >> >> >> Regards, >> -- >> Tiger >> >> _______________________________________________ >> Plasma-devel mailing list >> Plasma-devel@kde.org >> https://mail.kde.org/mailman/listinfo/plasma-devel >> >> > > _______________________________________________ > Plasma-devel mailing list > Plasma-devel@kde.org > https://mail.kde.org/mailman/listinfo/plasma-devel > >
# Project Needs a name ofcourse
project(plasma-tutorial1)
# Find the required Libaries
find_package(Qt4 REQUIRED)
find_package(KDE4 REQUIRED)
include(KDE4Defaults)
add_definitions (${QT_DEFINITIONS} ${KDE4_DEFINITIONS})
include_directories(
${CMAKE_SOURCE_DIR}
${CMAKE_BINARY_DIR}
${KDE4_INCLUDES}
${Qt4_INCLUDES}}
)
# We add our source code here
set(tutorial1_SRCS plasma-tutorial1.cpp)
# Now make sure all files get to the right place
kde4_add_plugin(plasma_applet_tutorial1 ${tutorial1_SRCS})
target_link_libraries(plasma_applet_tutorial1
${KDE4_PLASMA_LIBS} ${KDE4_KDEUI_LIBS} ${Qt4_LIBS})
install(TARGETS plasma_applet_tutorial1
DESTINATION ${PLUGIN_INSTALL_DIR})
install(FILES plasma-applet-tutorial1.desktop
DESTINATION ${SERVICES_INSTALL_DIR})
#include "plasma-tutorial1.h"
#include <QPainter>
#include <QFontMetrics>
#include <QSizeF>
#include <QPainter>
#include <QApplication>
#include <QInputDialog>
QSizePolicy::Policy policy = QSizePolicy::Preferred;
class MyGraphicsWidget: public QGraphicsWidget {
public:
MyGraphicsWidget(QGraphicsItem * parent = 0) : QGraphicsWidget(parent) {}
void paint(QPainter *p, const QStyleOptionGraphicsItem *option, QWidget *widget = 0) {
QRectF r = rect();
p->setPen(QColor(0, 0, 255));
p->drawLine(r.left(), r.top(), r.right(), r.bottom());
p->drawLine(r.left(), r.bottom(), r.right(), r.top());
p->drawRect(r);
QSizeF s = parentWidget()->size();
p->drawText(10, 10, QString("Child:%1x%2").arg(size().width()).arg(size().height()));
p->drawText(10, 30, QString("Parent:%1x%2").arg(s.width()).arg(s.height()));
}
};
static void embedWidget(QGraphicsWidget *parent, QWidget *widget) {
}
PlasmaTutorial1::PlasmaTutorial1(QObject *parent, const QVariantList &args)
: Plasma::Applet(parent, args), layout_(NULL), child_(NULL)
{
resize(200, 200);
child_ = new MyGraphicsWidget(this);
layout_ = new QGraphicsLinearLayout(this);
layout_->setSpacing(0);
layout_->addItem(child_);
layout_->setSizePolicy(policy, policy);
setLayout(layout_);
setBackgroundHints(Plasma::Applet::NoBackground);
}
PlasmaTutorial1::~PlasmaTutorial1()
{
if (hasFailedToLaunch()) {
// Do some cleanup here
} else {
// Save settings
}
}
void PlasmaTutorial1::init()
{
}
void PlasmaTutorial1::paintInterface(QPainter *p,
const QStyleOptionGraphicsItem *option, const QRect &contentsRect)
{
}
void PlasmaTutorial1::constraintsEvent(Plasma::Constraints constraints) {
kDebug() << "constraintsEvent";
}
void PlasmaTutorial1::contextMenuEvent(QGraphicsSceneContextMenuEvent * event) {
QSize s = child_->size().toSize();
int size = QInputDialog::getInteger(NULL, "Set Size", "Set size",
s.width()*1000 + s.height());
if (size == s.width()*1000 + s.height()) return;
child_->resize(size/1000, size%1000);
child_->setPreferredSize(size/1000, size%1000);
// child_->setMinimumSize(size/1000, size%1000);
setPreferredSize(layout_->preferredSize());
updateGeometry();
kDebug() << "mouseDoubleClickEvent";
}
#include "plasma-tutorial1.moc"
#ifndef Tutorial1_HEADER
#define Tutorial1_HEADER
// We need the Plasma Applet headers
#include <KIcon>
#include <Plasma/Applet>
#include <Plasma/Svg>
#include <QGraphicsLinearLayout>
class QSizeF;
// Define our plasma Applet
class PlasmaTutorial1 : public Plasma::Applet
{
Q_OBJECT
public:
// Basic Create/Destroy
PlasmaTutorial1(QObject *parent, const QVariantList &args);
~PlasmaTutorial1();
// The paintInterface procedure paints the applet to screen
void paintInterface(QPainter *painter,
const QStyleOptionGraphicsItem *option,
const QRect& contentsRect);
void init();
protected:
virtual void constraintsEvent(Plasma::Constraints constraints);
virtual void contextMenuEvent(QGraphicsSceneContextMenuEvent * event);
QGraphicsLinearLayout *layout_;
QGraphicsWidget* child_;
};
// This is the command that links your applet to the .desktop file
K_EXPORT_PLASMA_APPLET(tutorial1, PlasmaTutorial1)
#endif
plasma-applet-tutorial1.desktop
Description: Binary data
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