Showing custom popup dialog from c++

JanW

Hi,

I'm trying to add a general way of showing popup dialogs, messageboxes, settingswindows in my application. I have a function showPopupDialog(const std::string& sourceQMLFile) which should handle this.
My popup dialogs/messageboxes/... are all implemented in seperate qml files. They have a custom look and feel (Their root item is a Rectangle, not a Window or a Dialog).

If I do:

appContect->showPopupDialog("qrc///TestDialog.qml");

with:

void ApplicationContext::showPopupDialog(const std::string& sourceQMLFile)
{
	if(_engine)
	{
		QQuickWindow* itm = qobject_cast<QQuickWindow*>(_engine->rootObjects().value(0));
		if(itm)
		{
			QQmlComponent component(_engine, QUrl(QString::fromStdString(sourceQMLFile)));
			QObject* childItem = qobject_cast<QObject*>(component.create());
			childItem->setParent(itm);
		}
	}	
}

and TestDialog.qml:

import QtQuick 2.0

Rectangle {
    width: 100;
	height: 100;
	color: "Red";
	visible: true;
}

I don't see anything. If I change in the TestDialog.qml the Rectangle with a Dialog, it shows me a dialog, but I don't want to have the standard frame/framebuttons/title. What Am I doing wrong? How can I best load my custom dialogs/messageboxes? Or should I better use a dialog/window as a rootitem (but then i want to have it frameless)?
Regards,

Jan

jpnurmi

Setting a (non-visual) parent object is not enough to make a QQuickItem visible. You must set a (visual) parent item. It can be the window's content item, or any other item that is in the window.

QQuickItem* childItem = qobject_cast<QQuickItem*>(component.create());
if (childItem)
    childItem->setParentItem(window->contentItem());

JanW

Changed the loading code to:

void ApplicationContext::showPopupDialog(const std::string& source)
{
	if(_engine)
	{
		QQuickWindow* itm = qobject_cast<QQuickWindow*>(_engine->rootObjects().value(0));
		if(itm)
		{
			QQmlComponent component(_engine, QUrl(QString::fromStdString(source)));
			QObject* childItem = qobject_cast<QObject*>(component.create());
			if(childItem)
			{
				childItem->setParent(itm->contentItem());
			}			
		}
	}	
}

and the TestDialog.qml to

import QtQuick 2.0

Rectangle {
	x: 0;
	y: 0;
    width: 1000;
	height: 1000;
	color: "Red";
	visible: true;

	Component.onCompleted:
	{
		console.log("TestDialog loaded");
	}
}

Maybe important info:
My main.cpp:

_engine = new QQmlApplicationEngine();
...
_engine->load(QUrl(QStringLiteral("qrc:/MainWindow.qml")));

and my MainWindow.qml

import QtQuick 2.3
import QtQuick.Controls 1.4
import QtQuick.Layouts 1.2
import QtQuick.Window 2.2

Window
{
	id: mainWindow;

	property var logo: "qrc:///logo.png";
	property var applicationName: "Application";
	property var projectName: "Untitled";

	width: 800;
	height: 600;
	visible: false;

	flags: Qt.FramelessWindowHint | Qt.WindowMinimizeButtonHint | Qt.WindowSystemMenuHint | Qt.Window;

...

	Component.onCompleted: mainWindow.showMaximized();
}

But still nothing when I try to show the TestDialog (my console output shows qml: TestDialog loaded, so i assume the item is loaded correctly...). It's not because the QQmlComponent gets out of scope, right? (tried to change it to a pointer, but no difference).

jpnurmi

You are still calling QObject::setParent() instead of QQuickItem::setParentItem().

JanW

Wow, I should read the answers more carefully. It works now, Thanks!

Jan