When I set enabled property on a ComboBox for example, then it gets "greyed out". As far as I can tell it draws a layer above the component with a certain opacity so the original design is visible but becomes slightly faded. How can I tweak this effect?
I tried to change my components background color based on the enabled property's state, but that didn't help. For example I have set my background color to red, when the enabled property was false, but it didn't become red, it became more like a light red due to the overlay what I was describing above.
A simple code example:
ComboBox {
id: control
enabled: false
model: ["First", "Second", "Third"]
background: Rectangle {
color: control.enabled ? "transparent" : "red"
}
}
So as #jpnurmi suggested, the source of my problem was fixed in Qt 5.7.1.
ComboBox {
id: control
enabled: false
model: ["First", "Second", "Third"]
opacity: 1 // *
background: Rectangle {
color: control.enabled ? "transparent" : "red"
}
}
* = Adding this here, will overwrite the default opacity behaviour and then it can be controlled manually through the background component for example.
Related
I am trying to change the color of the background of the comboBox when pulling till you have a "bounce effect". Cause my background color in the comboBox is black but on the bounce effect the background of the background is white.
If it's not possible I would at least want to be able to desactivate this effect "bouncing effect".
I tried as describe here but it didn't work.
Thanks in advance for your help.
The white background you are seeing is from the popup property embedded in the ComboBox, specifically its background.color. To customize this, the documentation recommends you re-implement the entire popup as well as its ListView contentItem. Re-implementation of this type can be quite painful as you must re-implement all behaviors as well as visual characteristics. I find this to be overkill when you only want to tweak a property or two that already exists.
An easier way is to set the properties at runtime. Here is a working example that shows how to modify your "bounce effect" color as well as modify effect itself:
ComboBox {
id: comboBox
model: ["first", "second", "third"]
delegate: Rectangle { // My remake of your black-background delegates
color: "black"
implicitHeight: 20
implicitWidth: comboBox.width
Text {
anchors {
centerIn: parent
}
text: modelData
color: "lime"
}
}
// At runtime, reach into the comboBox.popup and set the background and boundsBehavior:
Component.onCompleted: {
comboBox.popup.background.color = "black" // Set "bounce" background color to black
comboBox.popup.contentItem.boundsBehavior = Flickable.StopAtBounds // Change/stop "bounce" behavior
}
}
My Qt Quick Control 2 app is using Material Dark Theme. I would like to change background color of selected item in ListView. I know that I can do this in item delegate:
SwipeDelegate {
id: delegate
checkable: true
spacing: 0
width: parent.width
background: Rectangle {
color: index===currentIndex ? "red" : "transparent"
}
But with change above I'm losing defaults padding etc and also Material's radial animation on press and hold state is missing too. Is it possible to just change color only of selected item and keep original behavior for other states of item? Seems that I must reimplement missing things by my self
Maybe you should consider to implement highlight. The following worked for me:
ListView {
// ... Your stuff ...
highlight: Rectangle { color: "lightsteelblue"; }
focus: true
}
I want to set a background colour for my tree view but cannot find a way.
Say I have the following
Rectangle {
width: 800
height: 800
anchors.fill: parent
TreeView {
id: view
model: theModel
}
}
What do I need to set a background color?
Setting a color on the parent does not work and I cannot see how to use TreeViewStyle to do this.
You can add the property backgroundVisible: false (and alternatingRowColors: false if needed).
The delegate is not affected by this property. You may need to define a new one without a background.
I just want to change the background color of QML buttons but it seems there are no simple way. Can you tell me a simple way to change the background color of QML Button? Thanks!
Update: a code I have searched:
import QtQuick 2.6
import QtQuick.Controls 2.1
Button {
id: control
text: qsTr("Button")
contentItem: Text {
text: control.text
font: control.font
opacity: enabled ? 1.0 : 0.3
color: control.down ? "#17a81a" : "#21be2b"
horizontalAlignment: Text.AlignHCenter
verticalAlignment: Text.AlignVCenter
elide: Text.ElideRight
}
background: Rectangle {
implicitWidth: 100
implicitHeight: 40
opacity: enabled ? 1 : 0.3
border.color: control.down ? "#17a81a" : "#21be2b"
border.width: 1
radius: 2
color: "black" // I update background color by this
}
}
Works with QT Quick 2:
Button {
id: button
text: qsTr("Button text")
background: Rectangle {
color: parent.down ? "#bbbbbb" :
(parent.hovered ? "#d6d6d6" : "#f6f6f6")
}
}
The above code change the button color when the button is down or hovered. It is also possible to add a border or other customizations.
The common way for QtQuick.Controls 2 is to redefine default Control visual properties to customize a Control. The disadvantage of this approach as I said above is that you cannot change, for example, just background color. Overriding Control.background forcing you to redefine all the element, including border, colors, animation etc.
Looking at the Button's source we can see that defines default Control.background property based on a Control.palette. Using this property we can override the Control properties:
For example:
Button {
text: "Test button"
palette {
button: "green"
}
}
But you should understand that internal source could be changed in the future. Also you have to imagine for yourself what palette properties is used by specified Control.
In the example above I redefine palette for specified Control. But you can redefine the palette globally, either be setting the color in qtquickcontrols2.conf or by setting custom palette in C++ - QGuiApplication::setPalette().
You can do this simply with Material.background of Button:
Button
{
id: button
Material.background:Material.Red
}
I am trying to design a login form with a material design on Qt which should look something like this:
However I can't figure out how to add colour to the button in QML and change the font colour of the button text. This is what I have got so far:
import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.3
Item {
property alias login: login
Pane {
id: pane
x: 144
y: 117
width: 353
height: 246
clip: false
font.strikeout: false
background: Rectangle {
color: "#ffffff"
}
ColumnLayout {
id: columnLayout
x: 139
y: -158
anchors.fill: parent
TextField {
id: username
Layout.fillWidth: true
placeholderText: qsTr("Username")
}
TextField {
id: password
Layout.fillWidth: true
placeholderText: qsTr("Password")
}
Button {
id: login
text: qsTr("Login")
spacing: -2
font.capitalization: Font.MixedCase
Layout.fillWidth: true
highlighted: false
// background: Rectangle {
// implicitWidth: 100
// implicitHeight: 40
// color: button.down ? "#d6d6d6" : "#f6f6f6"
// border.color: "#26282a"
// border.width: 1
// radius: 4
// }
}
}
}
}
As you can see (in the commented code) I tried to add colour using Rectangle with the background property but this removes the button features like shadow, highlight, darken on click and so on. Is there a simple way to accomplish this?
For reference here is the output of my code:
In order to theme a Material controls, you have to use the Material attached properties
In your case you want to use Material.background :
import QtQuick.Controls.Material 2.2
// ...
Button {
id: login
text: qsTr("Login")
Layout.fillWidth: true
Material.background: Material.Indigo
Material.foreground: "white"
}
Note that buttons should have upercased text, according to the material guidelines.
If you want to have a design that complies with the Google Materials design guidelines, the easiest way, is to use
QtQuick.Controls.Materials
To use them, it is sufficent to use any of the methods described here to activate them in your application. To try it out, I'd reccomend the command line argument. Just start your application with
-style material
If you want to have it fixed in your code, put it in the main.cpp:
QQuickStyle::setStyle("Material");
Note that the -style options is the very same option defined here for widgets and desktop os styles. Despite this quick styles and widget styles are totally different things and you cannot apply the former to the latter and vice versa. Widget
If now you already use the Material-style, but are not contempt with it and desire to change some of the definitions for selected controls, you can import
import QtQuick.Controls.Materials 2.x
where you need to adapt x to the most recent version installed. 0 is the right one for Qt5.7
Then you can alter specific aspects like
import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Controls.Material 2.0
ApplicationWindow {
id: mainWindow
width: 800
height: 600
visible: true
Button {
id: login
text: qsTr("LOGIN")
Material.background: Material.Orange // Change the background
}
}
If you don't want to use the Material and only want to change a specific color of the Control you need to understand why it is not that easy to do, without messing it up.
I tried to add colour using Rectangle with the background property but this removes the button features like shadow, highlight, darken on click and so on. Is there a simple way to accomplish this?
You can't just change the color of the background, as there is not the color. There are various colors that are applied for different states. The expression might look like this:
color: (control.down ? 'darkgrey' : 'lightgrey')
So if you change the color to orange like this:
color: 'orange'
you messed up, as now the other state is not considered anymore.
Additionally, of course, you can't change the color of the background like background.color: 'green' from the beginning, as QML does not know about the property background.color. It expects an Item there, which has no color and the Rectangle is only created later. So what you need to do is
Be cautious to not override states
Wait until the property is available
example.qml
Button {
id: login
text: qsTr("LOGIN")
Binding {
target: login
property: "background.color"
value: 'red'
when: !login.pressed // Here comes the state
}
}
You can simply highlight a Button to make the button colorize its background in a style-independent way. The Material style fills the background with the accent color and makes the text light:
Button {
text: qsTr("Login")
highlighted: true
}
A highlighted Button is by far more efficient than a customized button. Customization should be done only if necessary. It is just a visual highlight. There can be multiple highlighted buttons. Highlighting a Button does not affect focus.