I'm developing a progress bar in QML.
But the working is not working for all parameter values.
Its more bit of logical issue in UI
Requesting everyone to review it.
below is the code snippet
Rectangle
{
width: 500; height: 480
.....
color: "lightyellow"
Rectangle {
id: container
....
Row {
id:repeaterid
Repeater {
id: repeater
model: 100
Item { id: smallrect2; opacity:0.5; width:_width; height:_height
Rectangle { id: smallrect; color: _newColor }
......
}
}
}
Timer {
id: progressTimer
interval: 100
onTriggered: {
if ((slider.x + slider.width) < repeaterid.width)
{
slider.x += _width
var item = repeater.itemAt(indexCurrent)
item._newColor = "red"
indexCurrent++
}
else
{
progressTimer.repeat = false
}
}
}
Rectangle {
id: slider
// Adjust the dimensions of slider
x: repeaterid.x
y: repeaterid.y
width: _width
height: _height
}
}
}
The desired behaviour is achieved when value of _width is 30 and the model value in the repeater is 18, but as the value is decreased the slider in progress bar doesn't complete its path ( width = 5, model =100 ) or if increased it moves out of the path.
Solved : Adjusted model value according to container size & rectangle size
Related
I tried to get the mouse click position in qml Image component, but what I got is not the real pixel-based image position, how can I get the pixel-based position of the image?
this is my qml code
Image {
id: sourceImage
width: parent.width
height: parent.height
fillMode: Image.PreserveAspectFit
source: "D://test.png"
mipmap: true
smooth: true
antialiasing: true
MouseArea {
width: parent.width
height: parent.height
focus: true
anchors.fill: parent
onClicked: {
print("clicked:", mouse.x,mouse.y)
}
}
}
the real image size is 3840*1260, but when I click the bottom-right position with the mouse, it prints clicked: 683 547
A lot of the code is boilerplate for debugging. The important part is the three functions mapToImage() and getXPosition()/getYPosition(). The latter is for getting the offset at which the image is drawn, when Image.PreservedAspectFit can't fill the Image and horizontalAlginment/verticalAlignment are used.
The map function uses sourceSize and paintedWidth/paintedHeight to get the scaling between the original size of the image and the actual drawn image. Keep in mind that when changing sourceSize and not letting the image set it, this method of getting the scaling might not work.
Just a note from the documentation:
sourceSize can be cleared to the natural size of the image by setting
sourceSize to undefined.
import QtQuick
import QtQuick.Controls
Window {
id: root
visible: true
width: 800
height: 600
title: qsTr("Image Picking")
function getXPosition(image : Image) : real {
switch (image.horizontalAlignment) {
case Image.AlignLeft:
return 0
case Image.AlignRight:
return image.width - image.paintedWidth
case Image.AlignHCenter:
default:
return (image.width - image.paintedWidth) * 0.5
}
}
function getYPosition(image : Image) : real {
switch (image.verticalAlignment) {
case Image.AlignTop:
return 0
case Image.AlignBottom:
return image.height - image.paintedHeight
case Image.AlignVCenter:
default:
return (image.height - image.paintedHeight) * 0.5
}
}
function mapToImage(mouse : MouseEvent, image : Image) {
root.xScale = image.paintedWidth / image.sourceSize.width
root.yScale = image.paintedHeight / image.sourceSize.height
root.xImgPosition = Math.floor((mouse.x - root.getXPosition(image)) / root.xScale)
root.yImgPosition = Math.floor((mouse.y - root.getYPosition(image)) / root.yScale)
}
property real xScale: 0
property real yScale: 0
property real xImgPosition: 0
property real yImgPosition: 0
Image {
id: image
anchors.centerIn: parent
width: 320
height: 240
fillMode: Image.PreserveAspectFit
//horizontalAlignment: Image.AlignLeft
source: "https://picsum.photos/id/17/200/300"
mipmap: true
smooth: true
antialiasing: true
MouseArea {
id: mouseArea
anchors.fill: parent
hoverEnabled: true
onPositionChanged: function(mouse) { root.mapToImage(mouse, image) }
}
Rectangle {
anchors.fill: parent
color: "transparent"
border {
width: 1
color: "gray"
}
}
// Debug rectangle showing the real dimension of the image before clipping by the fillMode
Rectangle {
x: root.getXPosition(image)
y: root.getYPosition(image)
width: image.paintedWidth
height: image.paintedHeight
color: "transparent"
border {
width: 1
color: "red"
}
}
}
Rectangle {
width: column.width + 40
height: column.height + 40
color: Qt.rgba(0.3, 0.3, 0.3, 0.4)
Column {
id: column
x: 20
y: 20
spacing: 4
ComboBox {
width: 180
textRole: "text"
valueRole: "value"
onActivated: image.fillMode = currentValue
Component.onCompleted: currentIndex = indexOfValue(image.fillMode)
model: [
{ value: Image.Stretch, text: qsTr("Stretch") },
{ value: Image.PreserveAspectFit, text: qsTr("Preserve Aspect Fit") },
{ value: Image.PreserveAspectCrop, text: qsTr("Preserve Aspect Crop") }
]
}
Text { text: "Mouse: " + mouseArea.mouseX + ", " + mouseArea.mouseY }
Text { text: "Image: " + image.width + ", " + image.height }
Text { text: "Painted: " + image.paintedWidth + ", " + image.paintedHeight }
Text { text: "Source: " + image.sourceSize.width + ", " + image.sourceSize.height }
Text { text: "Scaling: " + root.xScale + ", " + root.yScale }
Text { text: "Position: " + root.xImgPosition + ", " + root.yImgPosition }
}
}
}
I want my graph has no label by default, but when I select a node its label will show up. There is chosen.label that seems promising, but I still don't know how to write the function. There is also a question about scaling.label, but as indicated in there it also seems not working.
Another approach is to have a checkbox to turn on and off the labels. See: Can the filter in the configure option specify an only option?
This can be achieved using the chosen.label option in combination with the transparent font color.
In the options object firstly set the default font color for nodes to transparent, then within chosen.label adjust it to a visible color.
var options = {
nodes: {
font: {
// Set default label font color to transparent
color: "transparent"
},
chosen: {
label: function(values, id, selected, hovering) {
// Adjust label font color so it is visible
// Updates to the values object are applied to the network
values.color = "#343434";
}
}
}
};
Working example is below.
// create an array with nodes
var nodes = new vis.DataSet([
{ id: 1, label: "Node 1" },
{ id: 2, label: "Node 2" },
{ id: 3, label: "Node 3" }
]);
// create an array with edges
var edges = new vis.DataSet([
{ from: 1, to: 3 },
{ from: 1, to: 2 },
{ from: 3, to: 3 },
]);
// create a network
var container = document.getElementById("mynetwork");
var treeData = {
nodes: nodes,
edges: edges,
};
var options = {
nodes: {
font: {
// Set default label font color to transparent
color: "transparent"
},
chosen: {
label: function(values, id, selected, hovering) {
// Adjust label font color so it is visible
// Updates to the values object are applied to the network
values.color = "#343434";
}
}
}
};
var network = new vis.Network(container, treeData, options);
#mynetwork {
width: 600px;
height: 180px;
border: 1px solid lightgray;
}
<script src="https://visjs.github.io/vis-network/standalone/umd/vis-network.min.js"></script>
<div id="mynetwork"></div>
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
}
}
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
}