Can't create my custom QGraphicsView for QDesigner

[sincnarf]

Hello I am trying to create my own custom QGraphicsView to be used by QtDesigner. This is my code and I based it on customclockwidget that I read in QtAssistant

#ifndef CUSTOMGVPLUGIN_H
#define CUSTOMGVPLUGIN_H
#include <QDesignerCustomWidgetInterface>
class customgvPlugin : public QObject, public QDesignerCustomWidgetInterface {
	Q_OBJECT
	Q_INTERFACES(QDesignerCustomWidgetInterface)
 
public:
	customgvPlugin(QObject *parent = 0);
 
	bool isContainer() const;
	bool isInitialized() const;
	QIcon icon() const;
	QString domXml() const;
	QString group() const;
	QString includeFile() const;
	QString name() const;
	QString toolTip() const;
	QString whatsThis() const;
	QGraphicsView *createWidget(QGraphicsScene *scene, QWidget *parent);
	void initialize(QDesignerFormEditorInterface *core);
 
private:
	bool initialized;
};
#endif

#ifndef CUSTOMGVPLUGIN_H
#define CUSTOMGVPLUGIN_H
#include <QDesignerCustomWidgetInterface>
class customgvPlugin : public QObject, public QDesignerCustomWidgetInterface {
	Q_OBJECT
	Q_INTERFACES(QDesignerCustomWidgetInterface)

public:
	customgvPlugin(QObject *parent = 0);

	bool isContainer() const;
	bool isInitialized() const;
	QIcon icon() const;
	QString domXml() const;
	QString group() const;
	QString includeFile() const;
	QString name() const;
	QString toolTip() const;
	QString whatsThis() const;
	QGraphicsView *createWidget(QGraphicsScene *scene, QWidget *parent);
	void initialize(QDesignerFormEditorInterface *core);

private:
	bool initialized;
};
#endif

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This is the error

customgvplugin.h:3:43: error: QDesignerCustomWidgetInterface: No such file or directory

What could be the cause of this? I'm running qt in Ubuntu Feisty Fawn. my make install for Qt-4.3.1 had no errors at all

[marcel]

Does your pro file contains

CONFIG += designer plugin

?

[sincnarf]

Does your pro file contains ?

Thanks for that. Now it has the error

customgvplugin.cpp: In function ‘QObject* qt_plugin_instance()’:
customgvplugin.cpp:73: error: cannot allocate an object of abstract type ‘customgvPlugin’
customgvplugin.h:4: note: because the following virtual functions are pure within ‘customgvPlugin’:
/usr/local/Trolltech/Qt-4.3.1/include/QtDesigner/customwidget.h:66: note: virtual QWidget* QDesignerCustomWidgetInterface::createWidget(QWidg et*)
make[1]: *** [release/customgvplugin.o] Error 1
make[1]: Leaving directory `/root/workspace/IADFUQ/PLUGINS/customgvplugin'
make: *** [release] Error 2

this is on last line

Q_EXPORT_PLUGIN2(customgvplugin, customgvPlugin)

Q_EXPORT_PLUGIN2(customgvplugin, customgvPlugin)

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here' the full code of the plugin

#include "customgv.h"
#include "customgvplugin.h"
 
#include <QtPlugin>
 
customgvPlugin::customgvPlugin(QObject *parent):QObject(parent) {
	initialized = false;
}
 
void customgvPlugin::initialize(QDesignerFormEditorInterface *) {
	if (initialized)
		return;
 
	initialized = true;
}
 
bool customgvPlugin::isInitialized() const {
	return initialized;
}
 
QGraphicsView *customgvPlugin::createWidget(QGraphicsScene *scene, QWidget *parent)
{
	return new customgv(scene, parent);
}
 
QString customgvPlugin::name() const {
	return "IADFUQGraphicsView";
}
 
QString customgvPlugin::group() const {
	return "Display Widgets [Examples]";
}
 
QIcon customgvPlugin::icon() const {
	return QIcon();
}
 
QString customgvPlugin::toolTip() const {
	return "";
}
 
QString customgvPlugin::whatsThis() const {
	return "";
}
 
bool customgvPlugin::isContainer() const {
	return false;
}
 
QString customgvPlugin::domXml() const {
	return "<widget class=\"customgv\" name=\"customgv\">\n"
		" <property name=\"geometry\">\n"
		"  <rect>\n"
		"   <x>0</x>\n"
		"   <y>0</y>\n"
		"   <width>100</width>\n"
		"   <height>100</height>\n"
		"  </rect>\n"
		" </property>\n"
		" <property name=\"toolTip\" >\n"
		"  <string>IADFUQ GRAPHICS VIEW</string>\n"
		" </property>\n"
		" <property name=\"whatsThis\" >\n"
		"  <string>IADFUQ GRAPHICS VIEW</string>\n"
		" </property>\n"
		"</widget>\n";
}
 
QString customgvPlugin::includeFile() const {
	return "customgv.h";
}
 
Q_EXPORT_PLUGIN2(customgvplugin, customgvPlugin)

#include "customgv.h"
#include "customgvplugin.h"

#include <QtPlugin>

customgvPlugin::customgvPlugin(QObject *parent):QObject(parent) {
	initialized = false;
}

void customgvPlugin::initialize(QDesignerFormEditorInterface *) {
	if (initialized)
		return;

	initialized = true;
}

bool customgvPlugin::isInitialized() const {
	return initialized;
}

QGraphicsView *customgvPlugin::createWidget(QGraphicsScene *scene, QWidget *parent)
{
	return new customgv(scene, parent);
}

QString customgvPlugin::name() const {
	return "IADFUQGraphicsView";
}

QString customgvPlugin::group() const {
	return "Display Widgets [Examples]";
}

QIcon customgvPlugin::icon() const {
	return QIcon();
}

QString customgvPlugin::toolTip() const {
	return "";
}

QString customgvPlugin::whatsThis() const {
	return "";
}

bool customgvPlugin::isContainer() const {
	return false;
}

QString customgvPlugin::domXml() const {
	return "<widget class=\"customgv\" name=\"customgv\">\n"
		" <property name=\"geometry\">\n"
		"  <rect>\n"
		"   <x>0</x>\n"
		"   <y>0</y>\n"
		"   <width>100</width>\n"
		"   <height>100</height>\n"
		"  </rect>\n"
		" </property>\n"
		" <property name=\"toolTip\" >\n"
		"  <string>IADFUQ GRAPHICS VIEW</string>\n"
		" </property>\n"
		" <property name=\"whatsThis\" >\n"
		"  <string>IADFUQ GRAPHICS VIEW</string>\n"
		" </property>\n"
		"</widget>\n";
}

QString customgvPlugin::includeFile() const {
	return "customgv.h";
}

Q_EXPORT_PLUGIN2(customgvplugin, customgvPlugin)

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Does this mean I can't create my own QGraphicsView to be integrated with QDesigner? (because QGraphicsView does not directly inherit the QWidget class? Instead QGraphicsView inherits from QAbstractScrollArea) (?)

[spud]

AFAICT you have to add

QWidget *customgvPlugin::createWidget(QWidget *parent)
{
    return new customgv(0, parent);
}

QWidget *customgvPlugin::createWidget(QWidget *parent)
{
    return new customgv(0, parent);
}

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[sincnarf]

AFAICT you have to add

QWidget *customgvPlugin::createWidget(QWidget *parent)
{
    return new customgv(0, parent);
}

QWidget *customgvPlugin::createWidget(QWidget *parent)
{
    return new customgv(0, parent);
}

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same error still. I think I'm gonna give up on this

[wysota]

createWidget has to return a QWidget pointer, not QGraphicsView pointer.

[sincnarf]

Attached are all of the files for a custom QGraphicsView. Anyway if ever I succeed in this, how can I handle the includes for customgv.h that will be used by the designer? On compilation of my whole project there's an error in ui_mainwindow.h file of mine because of the line

#include "customgv.h"

#include "customgv.h"

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Also all lines like

customgv *customgv;

customgv *customgv;

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in the ui_mainwindow.h will have errors. How will I solve this?

[wysota]

What kind of error?

[sincnarf]

What kind of error?

ui_mainwindow.h:68: error: ISO C++ forbids declaration of ‘customgv’ with no type
ui_mainwindow.h:68: error: expected ‘;’ before ‘*’ token
ui_mainwindow.h: In member function ‘void Ui_mainwindow::setupUi(QMainWindow*)’:
ui_mainwindow.h:351: error: ‘customgv’ was not declared in this scope
ui_mainwindow.h:351: error: expected type-specifier before ‘customgv’
ui_mainwindow.h:351: error: expected `;' before ‘customgv’
ui_mainwindow.h: In member function ‘void Ui_mainwindow::retranslateUi(QMainWindow*)’ :
ui_mainwindow.h:850: error: ‘customgv’ was not declared in this scope

[spud]

#include "‘customgv.h" is missing.

[sincnarf]

#include "‘customgv.h" is missing.

see, whenever I execute "qmake" "make" .... the ui_mainwindow.h that comes from my mainwindow.ui is generated including the line "#include "customgv.h", so it's already there...

What I need is this instead #include "../PLUGINS/customgvplugin/customgv.h" but alas, executing make generates the wrong path which is #include "customgv.h" only in my ui_mainwindow.h.

So what I'm thinking right now is now that I've created my libcustomgvplugin.so plugin and it's aleady under the folder /usr/local/Trolltech/Qt-4.3.1/plugins/designer.... how can executing "make" not report errors like the ones stated above

[wysota]

You have to place the header file in some known location (just like regular headers are placed within /usr/include) and use the INCLUDEPATH+=-I<dir> statement in the project file of the project where you want to use the file.

You can take a look at my wwWidgets to see how to solve some of your problems.