Touch Gallery demonstrates how to implement a UI suitable for touch input using the following Qt Quick Controls :
The appearance of the controls is customized by using Qt Quick Controls Styles .
要运行范例从 Qt Creator ，打开 欢迎 模式，然后选择范例从 范例 。更多信息，拜访 构建和运行范例 .
In the main.qml file, we use a Rectangle type within the ApplicationWindow type to create the main page of the application:
ApplicationWindow { visible: true width: 800 height: 1280 Rectangle { color: "#212126" anchors.fill: parent }
To use the Qt Quick Controls, we must import them:
import QtQuick.Controls 1.2
The
toolBar
property of the application window holds a
BorderImage
type that we use to create a separator between the application name and a list of additional pages:
toolBar: BorderImage {
border.bottom: 8
source: "images/toolbar.png"
width: parent.width
height: 100
使用
Image
type in a
Rectangle
type to create a back button. We use the
onClicked
signal handler to call the
StackView
pop()
function that pops off the page when users tap the button:
Rectangle {
id: backButton
width: opacity ? 60 : 0
anchors.left: parent.left
anchors.leftMargin: 20
opacity: stackView.depth > 1 ? 1 : 0
anchors.verticalCenter: parent.verticalCenter
antialiasing: true
height: 60
radius: 4
color: backmouse.pressed ? "#222" : "transparent"
Behavior on opacity { NumberAnimation{} }
Image {
anchors.verticalCenter: parent.verticalCenter
source: "images/navigation_previous_item.png"
}
MouseArea {
id: backmouse
anchors.fill: parent
anchors.margins: -10
onClicked: stackView.pop()
}
}
使用
opacity
property to hide the back button on the main page.
使用 Text type to display the application name:
Text {
font.pixelSize: 42
Behavior on x { NumberAnimation{ easing.type: Easing.OutCubic} }
x: backButton.x + backButton.width + 20
anchors.verticalCenter: parent.verticalCenter
color: "white"
text: "Widget Gallery"
}
The
x
position of the
Text
type is bound to the position and width of the back button, and animated using a
Behavior
.
使用 ListModel type that contains ListElement definitions to define titles and source files for the other pages in the application:
ListModel {
id: pageModel
ListElement {
title: "Buttons"
page: "content/ButtonPage.qml"
}
ListElement {
title: "Sliders"
page: "content/SliderPage.qml"
}
ListElement {
title: "ProgressBar"
page: "content/ProgressBarPage.qml"
}
ListElement {
title: "Tabs"
page: "content/TabBarPage.qml"
}
ListElement {
title: "TextInput"
page: "content/TextInputPage.qml"
}
ListElement {
title: "List"
page: "content/ListPage.qml"
}
}
We implement a stack-based navigation model to link the application pages together. Items are pushed onto the stack as users navigate deeper into the application, and popped off again when they return to the main page.
In main.qml, we add a StackView type as a child of the application window:
StackView {
id: stackView
anchors.fill: parent
// Implements back key navigation
focus: true
Keys.onReleased: if (event.key === Qt.Key_Back && stackView.depth > 1) {
stackView.pop();
event.accepted = true;
}
The stack is used by invoking its navigation methods. To load the first item in the stack view, we assign it to
initialItem
:
initialItem: Item {
width: parent.width
height: parent.height
ListView {
model: pageModel
anchors.fill: parent
delegate: AndroidDelegate {
text: title
onClicked: stackView.push(Qt.resolvedUrl(page))
}
}
}
}
}
使用
ListView
type to display a list of the items provided by
pageModel
。
AndroidDelegate
custom type defines each item instantiated by the view.
In ButtonPage.qml we use the Button type to create two buttons that change color when users tap them and one that pops off the page and returns the user to the main page:
Button {
text: "Press me"
style: touchStyle
}
Button {
style: touchStyle
text: "Press me too"
}
Button {
anchors.margins: 20
style: touchStyle
text: "Don't press me"
onClicked: if (stackView) stackView.pop()
}
使用 Switch type to create two switches that users can turn on and off. They are placed within a Row type to lay them out horizontally:
Row {
spacing: 20
Switch {
style: switchStyle
}
Switch {
style: switchStyle
}
}
A ButtonStyle type creates a custom appearance for the buttons:
Component {
id: touchStyle
ButtonStyle {
panel: Item {
implicitHeight: 50
implicitWidth: 320
BorderImage {
anchors.fill: parent
antialiasing: true
border.bottom: 8
border.top: 8
border.left: 8
border.right: 8
anchors.margins: control.pressed ? -4 : 0
source: control.pressed ? "../images/button_pressed.png" : "../images/button_default.png"
Text {
text: control.text
anchors.centerIn: parent
color: "white"
font.pixelSize: 23
renderType: Text.NativeRendering
}
To use Qt Quick Controls Styles, we must import them:
import QtQuick.Controls.Styles 1.1
A SwitchStyle type creates a custom appearance for the switches:
Component {
id: switchStyle
SwitchStyle {
groove: Rectangle {
implicitHeight: 50
implicitWidth: 152
Rectangle {
anchors.top: parent.top
anchors.left: parent.left
anchors.bottom: parent.bottom
width: parent.width/2 - 2
height: 20
anchors.margins: 2
color: control.checked ? "#468bb7" : "#222"
Behavior on color {ColorAnimation {}}
Text {
font.pixelSize: 23
color: "white"
anchors.centerIn: parent
text: "ON"
}
}
Item {
width: parent.width/2
height: parent.height
anchors.right: parent.right
Text {
font.pixelSize: 23
color: "white"
anchors.centerIn: parent
text: "OFF"
}
}
color: "#222"
border.color: "#444"
border.width: 2
}
handle: Rectangle {
width: parent.parent.width/2
height: control.height
color: "#444"
border.color: "#555"
border.width: 2
}
}
}
}
The
groove
property holds the background groove of the switch and the
handle
property defines the switch handle.
In SliderPage.qml, we use a Slider type to create three horizontal sliders that are placed within a Column type to lay them out in a column:
Column {
spacing: 12
anchors.centerIn: parent
Slider {
anchors.margins: 20
style: touchStyle
value: 0
}
Slider {
anchors.margins: 20
style: touchStyle
value: 0.5
}
Slider {
anchors.margins: 20
style: touchStyle
value: 1.0
}
}
The
value
property holds the initial handle position on the slider.
A SliderStyle type creates a custom appearance for the sliders:
Component {
id: touchStyle
SliderStyle {
handle: Rectangle {
width: 30
height: 30
radius: height
antialiasing: true
color: Qt.lighter("#468bb7", 1.2)
}
groove: Item {
implicitHeight: 50
implicitWidth: 400
Rectangle {
height: 8
width: parent.width
anchors.verticalCenter: parent.verticalCenter
color: "#444"
opacity: 0.8
Rectangle {
antialiasing: true
radius: 1
color: "#468bb7"
height: parent.height
width: parent.width * control.value / control.maximumValue
}
}
}
}
}
}
The
handle
property defines the slider handle and the
groove
property holds the background groove of the slider.
在 ProgressBar .qml, we use a ProgressBar type to create three progress bars:
Column {
spacing: 40
anchors.centerIn: parent
ProgressBar {
anchors.margins: 20
style: touchStyle
width: 400
value: progress
}
ProgressBar {
anchors.margins: 20
style: touchStyle
width: 400
value: 1 - progress
}
ProgressBar {
anchors.margins: 20
style: touchStyle
value: 1
width: 400
}
使用
NumberAnimation
类型采用
SequentialAnimation
type to run two number animations in a sequence. We apply the animations on the
progress
custom property to animate the current value on the progress bars:
property real progress: 0
SequentialAnimation on progress {
loops: Animation.Infinite
running: true
NumberAnimation {
from: 0
to: 1
duration: 3000
}
NumberAnimation {
from: 1
to: 0
duration: 3000
}
A ProgressBarStyle type creates a custom appearance for the progress bars:
Component {
id: touchStyle
ProgressBarStyle {
panel: Rectangle {
implicitHeight: 15
implicitWidth: 400
color: "#444"
opacity: 0.8
Rectangle {
antialiasing: true
radius: 1
color: "#468bb7"
height: parent.height
width: parent.width * control.value / control.maximumValue
}
}
}
}
}
In TabBarPage.qml, we use a TabView 类型采用 Tab type to provide a tab-based navigation model for our application. We use tabs to display the ButtonPage, SliderPage, and ProgressBarPage on separate tab pages:
TabView {
anchors.fill: parent
style: touchStyle
Tab {
title: "Buttons"
ButtonPage{ visible: true }
}
Tab {
title: "Sliders"
SliderPage{ visible: true }
}
Tab {
title: "Progress"
ProgressBarPage{ visible: true }
}
A TabViewStyle type creates a custom appearance for the tabs:
Component {
id: touchStyle
TabViewStyle {
tabsAlignment: Qt.AlignVCenter
tabOverlap: 0
frame: Item { }
tab: Item {
implicitWidth: control.width/control.count
implicitHeight: 50
BorderImage {
anchors.fill: parent
border.bottom: 8
border.top: 8
source: styleData.selected ? "../images/tab_selected.png":"../images/tabs_standard.png"
Text {
anchors.centerIn: parent
color: "white"
text: styleData.title.toUpperCase()
font.pixelSize: 16
}
Rectangle {
visible: index > 0
anchors.top: parent.top
anchors.bottom: parent.bottom
anchors.margins: 10
width:1
color: "#3a3a3a"
}
}
}
}
}
}
In the TextInputPage.qml, we use a TextField type to create an input field and a read-only text field:
Column {
spacing: 40
anchors.centerIn: parent
TextField {
anchors.margins: 20
text: "Text input"
style: touchStyle
}
TextField {
anchors.margins: 20
text: "Readonly Text input"
style: touchStyle
readOnly: true
}
}
A TextFieldStyle creates a custom appearance for the text fields:
Component {
id: touchStyle
TextFieldStyle {
textColor: "white"
font.pixelSize: 28
background: Item {
implicitHeight: 50
implicitWidth: 320
BorderImage {
source: "../images/textinput.png"
border.left: 8
border.right: 8
anchors.bottom: parent.bottom
anchors.left: parent.left
anchors.right: parent.right
}
}
}
}
}
使用 BorderImage type with an image to create borders for the fields.
In ListPage.qml, we use a ScrollView type to provide a scrolling page with a vertical scoll bar:
ScrollView { width: parent.width height: parent.height flickableItem.interactive: true
使用
ListView
type to display a list of 100 items by specifying an
integer
as the value of the
model
property. We reuse the
AndroidDelegate
custom type here to define each item instantiated by the view. The
text
property adds the string
Item #
to each list item:
ListView {
anchors.fill: parent
model: 100
delegate: AndroidDelegate {
text: "Item #" + modelData
}
}
A ScrollViewStyle type creates a custom appearance for the scroll view:
style: ScrollViewStyle {
transientScrollBars: true
handle: Item {
implicitWidth: 14
implicitHeight: 26
Rectangle {
color: "#424246"
anchors.fill: parent
anchors.topMargin: 6
anchors.leftMargin: 4
anchors.rightMargin: 4
anchors.bottomMargin: 6
}
}
scrollBarBackground: Item {
implicitWidth: 14
implicitHeight: 26
}
}
}
The
transientScrollBars
property is set to
true
to make the scroll bars appear when the content is scrolled and disappear when they are no longer needed.
The
handle
property controls the appearance of the scroll bar handle and the
scrollBarBackground
property that of the background.
文件：
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