[Resolved] How to add a onRezise to QWidget Inherit Class?

dcbasso

I'm creating my own QWidget.
Inside this widget I have the QWebView, and when the parent QWidget on the QWebView resizes, I want to handle with the event "onResize", on any other similar event.
It's possible to make that?!

KA51O

I'm not sure if I understand you correctly, but I think you want to "install a custom EventFilter":http://qt-project.org/doc/qt-4.8/qobject.html#eventFilter.

AcerExtensa

Maybe the "void resizeEvent(QResizeEvent *)":http://qt-project.org/doc/qt-4.8/qwidget.html#resizeEvent is what are you looking for?

broadpeak

two code snippet:

@
void YourWidget::resizeEvent(QResizeEvent * /* event */)
{
yourWebView->setGeometry(9, 9, 50, 25);
}
@

@

bool YourWidget::eventFilter(QObject *target, QEvent *event)
{
if (QResizeEvent resizeEvent = static_cast<QResizeEvent>(event))
somesize.setWidth(width);
else
return QWidget::eventFilter(target, event); // this line is important!
}
@

dcbasso

Thank you all.
The eventFilter Solve my problem.

AcerExtensa

Please add prefix "[SOLVED]" left to the topic subject. Thanks!

dcbasso

Well.. At the first look works... but know I got error!
I use this code:
@
installEventFilter(this);
@
but now is not working... When I use this code the Widget is not showing, any error appears to me, just the widget is not showed!!!! If removed the Widget is showed normally!

The code:

@
#include "widgetsvg.h"
#include "ui_widgetsvg.h"

#include <QWebFrame>
#include "QtCore/QDebug"

WidgetSVG::WidgetSVG(QWidget *parent) :
QWidget(parent),
ui(new Ui::WidgetSVG)
{
ui->setupUi(this);
}
WidgetSVG::WidgetSVG(Veiculo *newVeiculo, QWidget *parent):
QWidget(parent),
ui(new Ui::WidgetSVG)
{
ui->setupUi(this);
setVeiculo( newVeiculo );
installEventFilter(this);
}
WidgetSVG::~WidgetSVG()
{
delete ui;
}
void WidgetSVG::setVeiculo(Veiculo newVeiculo)
{
this->veiculo = newVeiculo;
ui->webView->setUrl( getVeiculo()->getFileUrl() );
ui->webView->page()->mainFrame()->addToJavaScriptWindowObject("sender", this);
}
Veiculo WidgetSVG::getVeiculo()
{
return this->veiculo;
}
void WidgetSVG::adjust()
{
qDebug() << "teste...";
// QString url = ui->webView->url().toString().remove(0, 7);
// renderer = new QSvgRenderer(url);
// ui->webView->setZoomFactor( getFactor() );
// qDebug() << "Factor: " << getFactor();
// qDebug() << "Ratio: " << getSVGRatio();
// double teste = (double) ui->webView->size().height() / ui->webView->size().width();
// qDebug() << "Now Ratio: " << teste;
}
void WidgetSVG::clicked(QString message)
{
qDebug() << "CLICKED --> " << message;
}
bool WidgetSVG::eventFilter(QObject *obj, QEvent *event)
{
qDebug() << "inside event filter...";
if (event->type() == QEvent::Resize)
{
adjust();
}
return true;
}
int WidgetSVG::getComponentWidth()
{
return ui->webView->size().width();
}
int WidgetSVG::getSVGWidth()
{
return renderer->defaultSize().width();
}
double WidgetSVG::getSVGRatio()
{
return (double) renderer->defaultSize().height() / renderer->defaultSize().width();
}
double WidgetSVG::getFactor()
{
return (double) getComponentWidth() / getSVGWidth();
}
@

How to fix it?!

broadpeak

As I wrote earlier:
@return QWidget::eventFilter(target, event); // this line is important!@
(this is important, 'cause if have any other event, later won't be handled)

Forget the return "true".
Hope this helps...

dcbasso

[quote author="broadpeak" date="1346160246"]two code snippet:
@
void YourWidget::resizeEvent(QResizeEvent * /* event */)
{
yourWebView->setGeometry(9, 9, 50, 25);
}
@
[/quote]

I'm trying this, and I got this error:

@../SistemaAssistenciaTecnica/widgetsvg.cpp:75:43: error: no 'void WidgetSVG::resizeEvent(QResizeEvent*)' member function declared in class 'WidgetSVG'
make: *** [widgetsvg.o] Error 1@

The code:

@
void WidgetSVG::resizeEvent(QResizeEvent *)
{
adjust();
}
@

dcbasso

[quote author="broadpeak" date="1346248753"]As I wrote earlier:
@return QWidget::eventFilter(target, event); // this line is important!@
(this is important, 'cause if have any other event, later won't be handled)

Forget the return "true".
Hope this helps...[/quote]

.h
@
public slots:
bool eventFilter(QObject *obj, QEvent *event);
@

.cpp
@
bool WidgetSVG::eventFilter(QObject *obj, QEvent *event)
{
qDebug() << "inside event filter...";
if (event->type() == QEvent::Resize)
{
adjust();
}
return QWidget::eventFilter(target, event);
}
@

Error:

@
../SistemaAssistenciaTecnica/widgetsvg.cpp: In member function 'virtual bool WidgetSVG::eventFilter(QObject*, QEvent*)':
../SistemaAssistenciaTecnica/widgetsvg.cpp:73:33: error: 'target' was not declared in this scope
../SistemaAssistenciaTecnica/widgetsvg.cpp: At global scope:
../SistemaAssistenciaTecnica/widgetsvg.cpp:66:6: warning: unused parameter 'obj'
../SistemaAssistenciaTecnica/widgetsvg.cpp: In member function 'virtual bool WidgetSVG::eventFilter(QObject*, QEvent*)':
../SistemaAssistenciaTecnica/widgetsvg.cpp:74:1: warning: control reaches end of non-void function
@

dcbasso

Sorry:

@
bool WidgetSVG::eventFilter(QObject *obj, QEvent *event)
{
qDebug() << "inside event filter...";
if (event->type() == QEvent::Resize)
{
adjust();
}
return QWidget::eventFilter(obj, event);
}
@

broadpeak

@
bool WidgetSVG::eventFilter(QObject *obj, QEvent *event)
{
qDebug() << "inside event filter...";
if (event->type() == QEvent::Resize)
{
adjust();
return true; // if you have handled the event (what you have filtered), HERE return "true"
}
// if you have NOT handled the event (other events), return with this:
return QWidget::eventFilter(obj, event);
}
@