Complex QML UI questions

kyleplattner

We are beginning the creation of a fairly complex user interface and would like to accomplish the following:

In order to avoid the entire UI being placed in one QML file with an unreasonable amount of "states" we would like to embed QML elements into a larger QML file where each item is a separate document. For instance, if we were creating an automotive dashboard we would have a speedometer QML file that controlled all the UI elements relating to the speedometer. This would sit in the larger dashboard UI along with the odometer qml file, etc.

Does this make sense? What code will accomplish this?

Also, how can I navigate between different QML UI pages? For instance in the dashboard example the setup pages would link to one another as the menu system is traversed.

DenisKormalev

Yes, it makes sense. If you will split elements in different files you can work with them like with standard qml components and reuse them as many times as you want.
Navigation between qml pages can be done via flippable or via moving old page off the screen and moving new page to screen.

kyleplattner

Could you provide more code detail. I am not surprised that it is possible, but I am at a loss for how to begin implementing both of these features.

DenisKormalev

Both of them are well described in qml examples and demos. Just take twitter demo and look into it. Both techniques are used there.

kyleplattner

So I am looking at the twitter example and I am trying to figure out how they embedded qml files into the larger qml document.

In twitter.qml is the "import "TwitterCore" 1.0 as Twitter" used to identify the folder? What is the 1.0?

DenisKormalev

1.0 is version.
TwitterCore here is folder and Twitter is alias for qmls in this folder. This alias is used in twitter.qml.

kyleplattner

So I tried creating my own folder and naming in a similar structure but it doesn't seem to work. I guess I will keep experimenting.

DenisKormalev

have you created qmldir file?

2beers

maybe this will help you: "http://doc.qt.nokia.com/4.7/qdeclarativedocuments.html":http://doc.qt.nokia.com/4.7/qdeclarativedocuments.html

but like Denis said you should look at flickr, twitter demos

mbrasser

"http://doc.qt.nokia.com/4.7/qdeclarativemodules.html":http://doc.qt.nokia.com/4.7/qdeclarativemodules.html is a good place to start for the import statement. In general, reading through the overviews at "http://doc.qt.nokia.com/4.7/qtquick.html":http://doc.qt.nokia.com/4.7/qtquick.html should give you a good introduction to QML.

kyleplattner

Isn't the qmldir part of the .qmlproject file?

kyleplattner

What I cannot figure out in any example is whether I can navigate from something like a mainpage.qml to a settings.qml and keep them wholly separate. Is this possible?

I look forward to a book or other resource where I can learn from ground up. Combing through examples has not proved to be super helpful yet.

Thanks,

Kyle

kyleplattner

I just found the qmldir file in the Twitter example. It is only visible in the project directory and not in Qt Creator at all.

tobias.hunger

kyleplattner: I am no quick expert, but I think I remember the filenames being case sensitive. So if you have a Button, then that should go into a Button.qml, not in button.qml.

kyleplattner

Tobias,
That solved one of my issues. Thanks,

Kyle

kyleplattner

I still am sketchy on how to cleanly navigate between separate qml documents.

2beers

OK. let me know if this works for you. I also started using qml so I'm at a very rookie level , if anyone has a better solution can correct me any time.

you have 3 files: main.qml, Page1.qml, Page2.qml

If I understand correct you want to move from page1 to page2. when you press the rectangle from page1 you will go to page 2 and the same way around. You can also use "transitions":http://doc.qt.nokia.com/4.7/qdeclarativeanimation.html#transitions for a more animated effect

here is the code:

main.qml

@import Qt 4.7

Rectangle {
id:main_rectangle
width: 360
height: 640

Page1{
    id:page1
}

Page2{
    id:page2
}

states: [
    State {
        name: "page2"
        PropertyChanges { target: page1; visible:false; }
        PropertyChanges { target: page2; visible:true; }
    },
    State {
        name: "page1"
        PropertyChanges { target: page2; visible:false; }
        PropertyChanges { target: page1; visible:true; }
    }

]

}
@

Page1.qml

@import Qt 4.7

Rectangle {

width: 360
height: 640

Text {
    id: myText
    x: 93
    y: 152
    width: 80
    height: 20
    text: "page 1"
}

Rectangle {
    id: rectangle1
    x: 93
    y: 216
    width: 100
    height: 100
    color: "#912121"

    MouseArea {
        id: mouse_area1
        anchors.fill: parent
        onClicked: main_rectangle.state="page2"
    }
}

}
@

Page2.qml

@import Qt 4.7

Rectangle {
width: 360
height: 640
visible: false;

Text {
    id: myText
    x: 93
    y: 152
    width: 80
    height: 20
    text: "page 2"
}

Rectangle {
    id: rectangle1
    x: 93
    y: 216
    width: 100
    height: 100
    color: "#912121"

    MouseArea {
        id: mouse_area1
        anchors.fill: parent
        onClicked: main_rectangle.state="page1"
    }
}

}
@

kyleplattner

Thanks so much, I look forward to trying this. This ran fine on your end?

2beers

[quote author="kyleplattner" date="1287845568"]Thanks so much, I look forward to trying this. This ran fine on your end?[/quote]

yes. it runs ok on my side. you load the main.qml file and click the rectangle

kyleplattner

You are very helpful. Let me know if you find any great QML resources for learning.