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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\page qtquickcontrols-fileselectors.html
\title Using File Selectors with Qt Quick Controls
\l {QFileSelector}{File selectors} provide a convenient way of selecting
file variants. Qt offers the platform name and the locale as built-in
selectors. Qt Quick Controls extends the built-in selectors with the name
(Capitalized) of the style that an application is running with.
By using file selectors, style-specific tweaks can be applied without
creating a hard dependency to a style. From the available file variants,
only the selected QML file is loaded by the QML engine. Each file variant
can assume the context, that is, a specific style. This typically leads
to some code duplication, but on the other hand, cuts the aforementioned
hard dependency to the style, and leads to simpler and more efficient
QML code.
The following example demonstrates a custom rounded button that has a
styled drop shadow in the \l {Material Style}{Material style}, and looks
flat in other styles. The files are organized so that the Material version
of \c CustomButton.qml is placed into a \c +Material sub-directory.
\code
:/main.qml
:/CustomButton.qml
:/+Material/CustomButton.qml
\endcode
By default, \c main.qml will use \c CustomButton.qml for the \c CustomButton
type. However, when the application is run with the Material style, the
\c Material selector will be present and the \c +Material/CustomButton.qml
version will be used instead.
\code
// main.qml
import QtQuick
import QtQuick.Controls
ApplicationWindow {
id: window
visible: true
CustomButton {
text: "Button"
anchors.centerIn: parent
}
}
\endcode
The base implementation of the custom button is a simple rounded
flat button.
\code
// CustomButton.qml
import QtQuick
import QtQuick.Controls
Button {
id: control
background: Rectangle {
radius: width / 2
implicitWidth: 36
implicitHeight: 36
color: control.pressed ? "#ccc" : "#eee"
}
}
\endcode
The Material style's implementation of the custom button imports the
Material style, requests a dark theme to get light text, and creates
a drop shadow for the background.
\code
// +Material/CustomButton.qml
import QtQuick
import QtQuick.Effects
import QtQuick.Controls
import QtQuick.Controls.Material
Button {
id: control
Material.theme: Material.Dark
background: Rectangle {
implicitWidth: 48
implicitHeight: 48
color: Material.accentColor
radius: width / 2
layer.enabled: control.enabled
layer.effect: MultiEffect {
shadowEnabled: true
shadowHorizontalOffset: 3
shadowVerticalOffset: 3
shadowColor: Material.dropShadowColor
shadowBlur: control.pressed ? 0.8 : 0.4
}
}
}
\endcode
\note It is recommended to use \l QQmlApplicationEngine, which internally
creates a \l QQmlFileSelector instance. This is all that is needed to take
QML file selectors into use.
\section1 Related Information
\list
\li \l {QFileSelector}
\li \l {QQmlFileSelector}
\li \l {Styling Qt Quick Controls}
\endlist
*/
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