Hi all,
I am learning the Qt Essentials(QML Version) by myself. And something in
transitions is confusing me.
In the pdf I download from nokia website, it says.
> transitions: [
> Transition {
> from: "stop"; to: "go"
> PropertyAnimation {
> target: stop_light
> properties: "color"; duration: 1000
> }
> },
> Transition {
> from: "go"; to: "stop"
> PropertyAnimation {
> target: go_light
> properties: "color"; duration: 1000
> }
> } ]
>
is the same as
> transitions: [
> Transition {
> from: "*"; to: "*"
> PropertyAnimation {
> target: stop_light
> properties: "color"; duration: 1000
> }
> PropertyAnimation {
> target: go_light
> properties: "color"; duration: 1000
> }
> } ]
>
And when I run the code in qmlviewer, they do do the same thing.(full code
is provided at the bottom of this email) However, I believe they shouldn't
be the same. As in the first code when transitioning from the "stop" to "go"
state, the target is only the "stop_light", and in the second code when
transition accurs, both the "stop_light" and "go_light" are targets.
Am I wrong or there is something I misunderstood?
The full qml file code here:
> import QtQuick 1.0
>
> Rectangle {
> width: 150; height: 250
>
> Rectangle {
> id: stopLight
> x: 25; y: 15; width: 100; height: 100
> }
> Rectangle {
> id: goLight
> x: 25; y: 135; width: 100; height: 100
> }
>
> states: [
> State {
> name: "stop"
> PropertyChanges { target: stopLight; color: "red" }
> PropertyChanges { target: goLight; color: "black" }
> },
> State {
> name: "go"
> PropertyChanges { target: stopLight; color: "black" }
> PropertyChanges { target: goLight; color: "green" }
> }
> ]
>
> state: "stop"
>
> MouseArea {
> anchors.fill: parent
> onClicked: parent.state == "stop" ?
> parent.state = "go" : parent.state = "stop"
> }
>
> transitions: [
> Transition {
> from: "*"; to: "*"
> PropertyAnimation {
> target: stopLight
> properties: "color"; duration: 1000
> }
> PropertyAnimation {
> target: goLight
> properties: "color"; duration: 1000
> }
> } ]
>
>
> }
>
> --
Owen Zhao
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