Complex QML UI questions



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



  • [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



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



  • 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();@



  • 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



  • 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



  • 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
     }
    

    }
    @



  • you example is for button.qml ? or for the main.qml?



  • button.qml



  • ok so do you receive any error? you defined the page2 in main.qml?



  • I am trying to figure out a way for the button to know what page should be navigated to based on what page it is currently on. For instance, if it is on page 1 then it should navigate to page 2 and if it is on page 2 it should navigate to page 1. That is what I was trying to accomplish but it threw me errors.



  • ok. but the button where it is build? in main page, page1 or page 2. because if it's build in main page and when you press it you load page1 for example then the button will probably become invisible. if the button is build in page1 or page2 you already know what is the current page. can you post the entire code for every qml page to make a better idea.



  • It is loaded in each page file:

    main.qml
    @import Qt 4.7

    Rectangle {
    id:main_rectangle
    width: 640
    height: 480

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

    Page1{
        id:page1
    }
    
    Page2{
        id:page2
    }
    Page3{
        id:page3
    }
    Page4{
        id:page4
    }
    Page5{
        id:page5
    }
    
    states: [
        State {
            name: "page5"
            PropertyChanges { target: page1; visible:false; }
            PropertyChanges { target: page2; visible:false; }
            PropertyChanges { target: page5; visible:true; }
            PropertyChanges { target: page4; visible:false; }
            PropertyChanges { target: page3; visible:false; }
        },
        State {
            name: "page4"
            PropertyChanges { target: page1; visible:false; }
            PropertyChanges { target: page2; visible:false; }
            PropertyChanges { target: page5; visible:false; }
            PropertyChanges { target: page4; visible:true; }
            PropertyChanges { target: page3; visible:false; }
    
        },
        State {
            name: "page3"
            PropertyChanges { target: page1; visible:false; }
            PropertyChanges { target: page2; visible:false; }
            PropertyChanges { target: page5; visible:false; }
            PropertyChanges { target: page4; visible:false; }
            PropertyChanges { target: page3; visible:true; }
    
        },
        State {
            name: "page2"
            PropertyChanges { target: page5; visible:false; }
            PropertyChanges { target: page4; visible:false; }
            PropertyChanges { target: page3; visible:false; }
            PropertyChanges { target: page1; visible:false; }
            PropertyChanges { target: page2; visible:true; }
        },
        State {
            name: "page1"
            PropertyChanges { target: page5; visible:false; }
            PropertyChanges { target: page4; visible:false; }
            PropertyChanges { target: page3; visible:false; }
            PropertyChanges { target: page2; visible:false; }
            PropertyChanges { target: page1; visible:true; }
        }
    
    ]
    

    }
    @

    page1.qml
    @import Qt 4.7

    Rectangle {

    width: 640
    height: 480
    
    Button { text: "Page Two"; x:50; y:232; }
    Button { text: "Page Three"; x:200; y:232; }
    Button { text: "Page Four"; x:350; y:232; }
    Button { text: "Page Five"; x:500; y:232; }
    

    }
    @

    button.qml
    @import Qt 4.7

    Rectangle {
    property alias text: textItem.text

    //var page = "page2"
    
    
     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 = "page2"
     }
    

    }
    @

    and every subsequent page (page2.qml, page3.qml, etc) is identical to page 1 with minor logical changes.



  • I got it to work by placing the mouse_area instructions within each specific page. The next question I have is regarding how I can skin my designs using CSS-like files. Is this possible?

    Kyle



  • Also, how can I change the state of my button.qml file from my page1.qml?



  • you just create states in your button.qml file and then you use buttonName.state=stateName



  • So no qmldir file needed? The page1.qml doesn't seem to know that button exists.



  • well didn't you created the button in page1.qml ?? did you gave it an id? you need to pass the button id from page1.qml and not from button.qml



  • another approach will be to use "Loader":http://doc.qt.nokia.com/4.7/qml-loader.html

    Just found out about it. :)



  • Can I create a .config file or the equivalent of a .plist file for the settings menu to write to?


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