I want to move a widget to the center of the container in a sequential animation, but it does not work:
SequentialAnimation {
PauseAnimation { duration: 1000 }
AnchorAnimation {
duration: 1000
// ERROR: Cannot assign to non-existent default property
AnchorChanges {
target: widget1
anchors.horizontalCenter: container.horizontalCenter
}
}
....
Neither:
SequentialAnimation {
PauseAnimation { duration: 1000 }
// ERROR: Cannot assign object to list
AnchorChanges {
target: widget1
anchors.horizontalCenter: container.horizontalCenter
}
AnchorAnimation {
duration: 1000
}
....
You can't put an AnchorChanges item into an animation. You have put it into a state definition.
Refer to the documentation for more details.
Related
react-native repeat animation
I searched how to implement a repeated animation ,and I found this.
//this.state.animatedStartValue = 0;
function cycleAnimation() {
Animated.sequence([
Animated.timing(this.state.animatedStartValue, {
toValue: 1,
duration: 500,
delay: 1000
}),
Animated.timing(this.state.animatedStartValue, {
toValue: 0,
duration: 500
})
]).start(event => {
if (event.finished) {
cycleAnimation();
}
});
}
It do works ,but when I use it in my project, I found that this solution will conflict with InteractionManager.runAfterInteractions, which is usually used to do something after animation.
I can use setTimeOut and so on to avoid this, but I want to ask ,is there any better solution to repeat animation , or to avoid this conflict?
use param {isInteraction: false }can avoid this problem.
//this.state.animatedStartValue = 0;
function cycleAnimation() {
Animated.sequence([
Animated.timing(this.state.animatedStartValue, {
toValue: 1,
duration: 500,
delay: 1000,
isInteraction: false,
}),
Animated.timing(this.state.animatedStartValue, {
toValue: 0,
duration: 500
})
]).start(event => {
if (event.finished) {
cycleAnimation();
}
});
}
I have following QML GridView:
GridView
{
id: ueProductGridView
antialiasing: true
clip: true
Layout.fillWidth: true
Layout.fillHeight: true
cellWidth: 200
cellHeight: 200
delegate: Rectangle
{
id: test
width: 192
height: 192
color: "red"
Text
{
anchors.fill: parent
text: index
}
transform:
[
Rotation
{
id: plateRotation
angle: -90
axis { x: 0; y: 1; z: 0 }
origin.x: -200
origin.y: 0
}
] // transform
SequentialAnimation
{
id: addAnimation
PauseAnimation
{
duration: Math.random()*2000
}
NumberAnimation
{
target: plateRotation
property: "angle"
to: 0
duration: 1000
}
}
SequentialAnimation
{
id: removeAnimation
PropertyAction
{
target: test
property: "GridView.delayRemove"
value: true
}
NumberAnimation
{
target: test
property: "scale"
to: 0
duration: 1000
}
PropertyAction
{
target: test
property: "GridView.delayRemove"
value: false
}
}
GridView.onAdd:
{
addAnimation.start();
} // onAdd
GridView.onRemove:
{
removeAnimation.start();
} // onRemove
} // delegate
Component.onCompleted:
{
model=10;
} // onCompleted:
} // GridView
Now, why delegate animations do not work, i.e., why GridView is empty? The code regarding animations was taken from tutorial and in there it works. However, if I comment/remove all code regarding animations, delegates are visible in GridView and it is all ok:
GridView
{
id: ueProductGridView
antialiasing: true
clip: true
Layout.fillWidth: true
Layout.fillHeight: true
cellWidth: 200
cellHeight: 200
delegate: Rectangle
{
id: test
width: 192
height: 192
color: "red"
Text
{
anchors.fill: parent
text: index
}
} // delegate
Component.onCompleted:
{
model=10;
} // onCompleted:
} // GridView
The animations associated to insertion/removal of elements from the views are Transitions (e.g. see add), between different States and are indeed called ViewTransitions. You should really take a deep look at the documentation page of this type: it is full of nice examples and describes in great details how addition/removal animations should be implemented.
When you define a ViewTransition, any property referenced inside it, if not differently targeted, refer a delegate property. Hence, if you write inside your GridView:
add: Transition {
NumberAnimation { property: "opacity"; from: 0; to: 1.0; duration: 500 }
NumberAnimation { property: "scale"; easing.type: Easing.OutBounce; from: 0; to: 1.0; duration: 750 }
}
you are saying that each time a new delegate is added to the grid, its opacity as well as scale properties should be animated. Top level animations, like in this case, run in parallel so the delegate is scaled and made visible at the same time.
Now, if you want to animate nested properties, like in the case of the Rotation angle, the easiest way is to alias it inside the delegate. That way it can be handled exactly the same way as any other delegate property, resulting in a clearer and simpler code.
It should be noted that the animations in your example does not work also because they are associated to add Transition. Such Transition is not used during model initialisation when instead the populate Transition is used. From the documentation:
This property holds the transition to apply to the items that are initially created for a view.
It is applied to all items that are created when:
The view is first created
The view's model changes
The view's model is reset, if the model is a QAbstractItemModel subclass
Finally, an advice. If you animate addition and removal of elements, especially if the animation is slow, it is also important to animation the adjustment made by the view to the other elements. Animating them in a graceful way can improve visual feeling A LOT. Hence, when you provide a add and a remove transition, take in account also the addition of a addDisplaced and a removeDisplaced Transition.
Here follows a modified version of your code that shows all the points discussed above:
import QtQuick 2.5
import QtQuick.Window 2.2
Window {
id: window
width: 600
height: 400
visible: true
ListModel {
id: model
ListElement { code: "0" }
ListElement { code: "1" }
ListElement { code: "2" }
ListElement { code: "3" }
ListElement { code: "4" }
ListElement { code: "5" }
}
GridView {
id: ueProductGridView
anchors.fill: parent
antialiasing: true
clip: true
cellWidth: 200
cellHeight: 200
delegate: Rectangle {
width: 192
height: 192
color: "red"
property alias angle: rot.angle // alias!
Text {
anchors.centerIn: parent
text: code
font.pixelSize: 30
}
transform: Rotation {
id: rot
angle: -90
axis { x: 0; y: 1; z: 0 }
origin.x: -200
origin.y: 0
}
MouseArea {
anchors.fill: parent
onClicked: ueProductGridView.model.remove(index)
}
} // delegate
add: Transition {
NumberAnimation { property: "opacity"; from: 0; to: 1.0; duration: 500 } //since is already at 1.0 we should enforce the start from 0
NumberAnimation { property: "scale"; easing.type: Easing.OutBounce; from: 0; to: 1.0; duration: 750 }
}
addDisplaced: Transition {
NumberAnimation { properties: "x,y"; duration: 200; easing.type: Easing.InBack }
}
remove: Transition {
NumberAnimation { property: "scale"; from: 1.0; to: 0; duration: 200 }
}
removeDisplaced: Transition {
NumberAnimation { properties: "x,y"; duration: 200; easing.type: Easing.OutBack }
}
populate: Transition {
NumberAnimation { properties: "angle"; to: 0; duration: 500 }
}
}
Component.onCompleted:{ ueProductGridView.model= model }
}
I'm new to blackberry cascades, I have looked into some of animations from the blackberry cascades samples from github but I'm not sure how to implement a page flip in and out animation instead of the default push and pop animation. Below is code of the page that performs the default push transition to next page. I need to replace this transition with flip. How should I go about it?
NavigationPane {
id: nav
peekEnabled: false
Page {
id: mainPage
Button:
{
onClicked:{
nav.push(homePageDefinition.createObject());
}
}
attachedObjects: [
ComponentDefinition {
id: homePageDefinition
source: "homepage.qml"
}
]
}
}
Try Flipable item. For example:
Flipable {
id: flipable
anchors.fill: parent
property bool flipped: false
front: Rectangle {anchors.fill: parent; color: "green"}
back: Rectangle {anchors.fill: parent; color: "yellow" }
transform: Rotation {
id: rotation
origin.x: flipable.width/2
origin.y: flipable.height/2
axis.x: 0; axis.y: 1; axis.z: 0
angle: 0
}
states: State {
name: "back"
PropertyChanges { target: rotation; angle: 180 }
when: flipable.flipped
}
transitions: Transition {
NumberAnimation { target: rotation; property: "angle"; duration: 500 }
}
MouseArea {
anchors.fill: parent
onClicked: flipable.flipped = !flipable.flipped
}
}
I have seen some examples in the documentation and the demos that the data-animation attribute can be used to switch off animations on a widget by specifying data-animation="false".
My question is: how can I define other settings for animations. For example:
{
animation: {
// fade-out current tab over 1000 milliseconds
close: {
duration: 1000,
effects: "fadeOut"
},
// fade-in new tab over 500 milliseconds
open: {
duration: 500,
effects: "fadeIn"
}
}
}
I cannot find documentation anywhere on how to define animation configuration like the one above using the data-animation attribute.
You should define it as:
data-animation="{ close: { duration: 1000, effects: 'fade:out' }, open: { duration: 500, effects: 'fade:in' } }"
Example for a window:
<div id="dialog" data-role="window" data-animation="{ close: { duration: 1000, effects: 'fade:out' }, open: { duration: 500, effects: 'fade:in' } }" data-visible="false">
This is the content of the window
</div>
See it in action here : http://jsfiddle.net/XNcmt/70/
The relevant documentation is this here.
You can can basically use the same values (primitives like boolean or object literals) for declarative initialization; the only difference is that it's a string representation of the object.
See OnaBai's answer for an example.
Is it possible to have a fade in/out animation when the source of an Image element is being changed ?
Do I need two Image elements ? Changing the opacity of one of the from 0 to 1 and another from 1 to 0 ?
To do this without much hassle. Run animations in this way:
Image {
id: toBeCreated
NumberAnimation on opacity {
id: createAnimation
from: 0
to: 1
duration: 2000
}
Component.onCompleted: createAnimation.start()
}
Image {
id: toBeDeleted
NumberAnimation on opacity {
id: destroyAnimation // start this animation from the function where you want to create new Images
to: 0
duration: 2000
onRunningChanged: {
if (!running) {
console.log("Destroying...")
toBeDeleted.destroy();
}
}
}
}
I Know its a little late but felt like sharing
Inspired by RajaRaviVarma ans i tried something like
A Qml for FadeInOut ImageView
import QtQuick 2.0
Item {
property string imageSource : ""
property string imageSourceTemp : ""
property real parentWidth: 0
property real parentHeight: 0
onImageSourceChanged:
{
destroyAnimation.start()
createAnimation.start()
}
Image {
id: toBeDeleted
source: imageSourceTemp
width: parentWidth
height: parentHeight
NumberAnimation on opacity {
id: destroyAnimation
to: 0.5
duration: 400
onRunningChanged: {
if (!running) {
}
}
}
}
Image {
id: toBeCreated
source: imageSource
width: parentWidth
height: parentHeight
NumberAnimation on opacity {
id: createAnimation
from: 0
to: 1
duration: 800
onRunningChanged: {
if (!running) {
imageSourceTemp = imageSource
}
}
}
}
}
And to use it Like
FadeinFadeOutImage {
id: song_image
imageSource: songImage
parentWidth: width
parentHeight: height
width: 406*scaleFactor
height: 406*scaleFactor
}