Complex QML UI questions

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.

2beers

Also a better example is to create, destroy the QML objects instead of make them not visible.

@function loadPage1() {
var component = Qt.createComponent("Page1.qml");
if (component.status == Component.Ready) {
var page = component.createObject(main_rectangle);
}
}

@

and on MouseArea you do something like this:

@ onClicked: loadPage1();@

kyleplattner

When I do the later example I return a "ReferenceError: Can't find variable: loadPage1" error. Do I need to make a qmldir file? Will Qt creator auto-generate one for me?

Kyle

2beers

you need to put the mousearea on main.qml and you don't need to create the 2 objects Page1 and Pgae2. you will create after the button is pushed

kyleplattner

In this example, if I wanted to make a button that loaded from a separate QML file as button.qml, why can't I do something like this:

@import Qt 4.7

Rectangle {
property alias text: textItem.text
var page = "page2"

if (page2.visible == true)
{

page = "page1"

}

 width: 100; height: 30
 border.width: 1
 radius: 5
 smooth: true

 gradient: Gradient {
     GradientStop { position: 0.0; color: "lightGray" }
     GradientStop { position: 0.5; color: "gray" }
     GradientStop { position: 1.0; color: "lightGray" }
 }

 Text {
     id: textItem
     anchors.centerIn: parent
     font.pointSize: 20
     color: "white"
     font.family: "Helvetica Neue"
 }

 MouseArea {
     id: mouse_area_button
     anchors.fill: parent
     onClicked: main_rectangle.state = page
 }

}
@