new bee here. I am trying something very simple and it is not working and I cannot figure out why.
I am on windows and according to to the documentation, I can easily re-size an image using "fillMode: Image.PreserveAspectFit"
https://doc.qt.io/qt-6/qml-qtquick-image.html
Here is the QML code
import QtQuick
Image {
id: buttonId
width: 60
height: 100
source: "large1.png"
fillMode: Image.PreserveAspectFit
}
This is getting included from a parent QML as such:
RowLayout
{
anchors.centerIn: parent
spacing: spacerWidth
MyImage {
}
}
The source image is 334x484 px
but here is what I get when I render the page:
my window is set to 480x272
Window {
width: 480
height: 272
visible: true
title: qsTr("Test")
What such a simple scaling is not working?
thank you.
With the user "SMR" help, it scaled properly as below:
Image {
id: buttonId
fillMode: Image.PreserveAspectFit
Layout.preferredWidth: 60
Layout.preferredHeight: 100
Related
when applying property bindings in QML I have encountered one problem. When we have a parent component (Window) and a child (Rectangle), which has some properties bind to parent's (width, height, or anchors.fill: parent), when I change parents properties in JS code, and if I want to read the values of the child's properties (that are bound to parent's) in the same JS code, it shows the old values (not updated). It looks like that the change of parents properties hasn't been propagated to child's. Here is the example of this problem:
Window {
id:myWindow
visible: true
width: 640
height: 480
title: qsTr("Hello World")
Rectangle{
id:customRec
width:parent.width
height: parent.height
color: "blue"
}
Button{
id:myBtn
onClicked: {
myWindow.width = 800
myWindow.height = 600
console.log(customRec.width)
console.log(customRec.height)
}
}}
After clicking on the button, it shows:
qml: 640
qml: 480
instead of 800 and 600, new values. Although the rectangle has been scaled well. After clicking again it will show updated values (800 and 600). Can someone please explain what is happening here and how can binding property change be propagated immediately to bound properties. I am using Qt 5.12.2 with msvc2017_64 compiler.
You are printing the properties before they got updated. With the below code you can find that onWidthChanged signal comes after the console log. onWidthChanged signal comes after updating the width.
import QtQuick 2.10
import QtQuick.Window 2.10
import QtQuick.Controls 2.2
Window {
id:myWindow
visible: true
width: 640
height: 480
title: qsTr("Hello World")
Rectangle{
id:customRec
width: parent.width
height: parent.height
color: "blue"
onWidthChanged: console.log("***********")
}
Button{
id:myBtn
width: 100
height: 100
onClicked: {
myWindow.width = myWindow.width +50
myWindow.height = myWindow.height +50
console.log("--------------------------")
console.log("window width" + myWindow.width)
console.log("window height" + myWindow.height)
console.log("customrect width" + customRec.width)
console.log("customrect height" + customRec.height)
}
}
}
I need to create components dynamically add added to an area of the screen that, of course, needs to be scrollable. I found out that no matter how many of components I added with the scroll bar as its parent, the scroll bars would not appear and the element would not be scrollable.
I did a little fiddling and I think I came up with a minum working example of what I am talking about:
import QtQuick 2.9
import QtQuick.Window 2.2
import QtQuick.Controls 2.2
Window {
visible: true
width: 640
height: 480
title: qsTr("Hello World")
ScrollView {
width: 200
height: 200
clip: true
Label {
text: "ABC"
font.pixelSize: 224
}
// Rectangle {
// color: "#ff0000"
// width: 100
// height: 100
// }
}
}
This is a modified version of the example used int he official documentation. However when I uncomment the square the screen is no longer scrollable (scroll bars never appear).
If I remove the label and leave the rectangle (making it larger so that there is something to scroll to) it still doesn't work.
I am using Qt 5.10.
So the code below worked for me. I defined a rectangle as a backgroud to get border lines to a scrollable table that I need to create.
Rectangle {
id: tableBackground
color: "#ffffff"
border.width: 2
border.color: "#EDEDEE"
radius: 4
anchors.top: tableHeader.bottom
anchors.left: tableHeader.left
width: vmTableWidth
height: vmTableHeight - tableHeader.height
ScrollView {
id: tableArea
anchors.fill: parent
clip: true
ListView {
id: patientListView
anchors.fill: parent
model: patientList
delegate: VMPatientEntry {
onFetchReport: {
// This is a signal emitted by my VMPatientEntry.
}
}
onCurrentIndexChanged: {
// Do stuff when the current index changes.
}
}
}
}
So I hope this answer allows someone to fix their problem as well.
I have a TextArea. If I set padding constantly padding working normally.
import QtQuick 2.9
import QtQuick.Controls 2.2
ApplicationWindow {
visible: true
width: 640
height: 480
title: qsTr("Hello World")
TextArea{
font.pixelSize: 20
anchors.fill: parent
wrapMode: TextArea.Wrap
leftPadding: 100 //*parent.width/640
rightPadding: 100 //*parent.width/640
}
}
If I uncomment lines above then I have strange behavior.
What am I doing wrong?
Screenshot
It seems to be a bug, probably some updates are missing, when setting up the width of the contentItem of the ApplicationWindow, so the line lengths are not calculated properly.
If you write:
leftPadding: {
console.log(parent, parent.width)
return 100 * parent.width/640
}
You can see, that the parent.width is initially set to 0 and then changes to 640. When this change happens, there must be something going wrong with the signals.
A resize of the window will update the line lengths, so the proper layout is restored. You might try to file a bugreport on http://bugreports.qt.io to have it fixed.
Other than that, you may give an ID to your ApplicationWindow and use this instead of parent
import QtQuick 2.7
import QtQuick.Controls 2.0
ApplicationWindow {
id: win
visible: true
width: 640
height: 480
title: qsTr("Hello World")
TextArea{
font.pixelSize: 20
anchors.fill: parent
wrapMode: TextArea.Wrap
leftPadding: 100 * win.width/640
rightPadding: 100 * win.width/640
}
}
I have ListView with my own delegate.
import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.0
ItemDelegate
{
height: 40
Row
{
spacing: 10
anchors.verticalCenter: parent.verticalCenter
CheckBox
{
}
}
}
The problem is that check boxes does not resize despite ItemDelegate's height.
I get this for height = 40:
I get this for height = 10:
I've tried playing with CheckBox'es width and height values - did not help.
Is it possible to make it smaller at all, without customizing it?
You can, in theory, increase the size of the indicator, but it won't increase the size of the checkmark image:
CheckBox {
text: "CheckBox"
anchors.centerIn: parent
checked: true
indicator.width: 64
indicator.height: 64
}
There are a couple of reasons why the image is not scaled. First of all, the checkmark would be blurry if it was upscaled. And more importantly, to retain best possible performance. Instead of calculating all the sizes relative to each other and that way creating huge amounts of bindings like Qt Quick Controls 1 did, Qt Quick Controls 2 bases its scalability instead on the automatic high-DPI scaling system introduced in Qt 5.6. You get simply a different #Nx image when running with scale factor N.
I'm afraid you need to customize your checkbox to get a different size.
Example:
import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQml 2.2
ApplicationWindow {
visible: true
width: 640
height: 480
title: qsTr("Hello World")
Component {
id: contactDelegate
ItemDelegate
{
id: item
width: 40
height: 40
CheckBox
{
id: control
text: name
indicator: Rectangle {
implicitWidth: item.width
implicitHeight: item.height
x: control.leftPadding
y: parent.height / 2 - height / 2
border.color: control.down ? "#dark" : "#grey"
Rectangle {
width: 25
height: 25
x: 7
y: 7
color: control.down ? "#dark" : "#grey"
visible: control.checked
}
}
}
}
}
ListView {
width: 180;
height: 200;
spacing: 10
model: ContactModel {}
delegate: contactDelegate
}
}
By the way, the spacing property should be set in your ListView, not the delegate. Otherwise, it has no effect.
I am trying to write a little program, which has to connect to the Internet. While doing this, the app should show an animation which I have made in Flash Professional and exported as a sprite sheet.
I use the AnimatedSprite Type in QML:
import QtQuick 2.2
import QtQuick.Controls 1.1
ApplicationWindow {
visible: true
width: 640
height: 480
flags: Qt.FramelessWindowHint
| Qt.Window
color:"#00000000"
title:"Presenter Remote"
Rectangle{
color:"steelblue"
height:parent.height
width:parent.width
radius: 10
}
Image {
anchors.right: parent.right
anchors.top: parent.top
anchors.topMargin: -20
scale: 0.5
source: "close.png"
MouseArea {
width:parent.width
height:parent.height
onClicked: Qt.quit()
}
}
AnimatedSprite{
source: "Animation_Cloud.png"
anchors.centerIn: parent
frameHeight:313
frameWidth:232
running: true
frameCount:60
frameDuration: 20
width:232
height:313
}
}
When I compile and launch I get the sprite animating, but it moves from right to left while doing it.
How can I set the sprite still and just keep the "half arrows" moving?
The problem seems to be with your sprite sheet; remove the excess space from the right hand side of the .png.