Vertical or horizontal non-interactive scroll indicator. 更多...
| import 语句： | import QtQuick.Controls 2.2 |
| Since: | Qt 5.7 |
| 继承： | Control |
ScrollIndicator is a non-interactive indicator that indicates the current scroll position. A scroll indicator can be either vertical or horizontal , and can be attached to any Flickable ，譬如 ListView and GridView .
Flickable {
// ...
ScrollIndicator.vertical: ScrollIndicator { }
}
注意： When ScrollIndicator is attached vertically or horizontally to a Flickable, its geometry and the following properties are automatically set and updated as appropriate:
An attached ScrollIndicator re-parents itself to the target Flickable. A vertically attached ScrollIndicator resizes itself to the height of the Flickable, and positions itself to either side of it based on the layout direction . A horizontally attached ScrollIndicator resizes itself to the width of the Flickable, and positions itself to the bottom. The automatic geometry management can be disabled by specifying another parent for the attached ScrollIndicator. This can be useful, for example, if the ScrollIndicator should be placed outside a clipping Flickable. This is demonstrated by the following example:
Flickable {
id: flickable
clip: true
// ...
ScrollIndicator.vertical: ScrollIndicator {
parent: flickable.parent
anchors.top: flickable.top
anchors.left: flickable.right
anchors.bottom: flickable.bottom
}
}
Horizontal and vertical scroll indicators do not share the active state with each other by default. In order to keep both indicators visible whilst scrolling to either direction, establish a two-way binding between the active states as presented by the following example:
Flickable { anchors.fill: parent contentWidth: parent.width * 2 contentHeight: parent.height * 2 ScrollIndicator.horizontal: ScrollIndicator { id: hbar; active: vbar.active } ScrollIndicator.vertical: ScrollIndicator { id: vbar; active: hbar.active } }
It is possible to create an instance of ScrollIndicator without using the attached property API. This is useful when the behavior of the attached scoll indicator is not sufficient or a Flickable is not in use. In the following example, horizontal and vertical scroll indicators are used to indicate how far the user has scrolled over the text (using MouseArea 而不是 Flickable ):
Rectangle { id: frame clip: true width: 160 height: 160 border.color: "black" anchors.centerIn: parent Text { id: content text: "ABC" font.pixelSize: 169 MouseArea { id: mouseArea drag.target: content drag.minimumX: frame.width - width drag.minimumY: frame.height - height drag.maximumX: 0 drag.maximumY: 0 anchors.fill: content } } ScrollIndicator { id: verticalIndicator active: mouseArea.pressed orientation: Qt.Vertical size: frame.height / content.height position: -content.y / content.height anchors { top: parent.top; right: parent.right; bottom: parent.bottom } } ScrollIndicator { id: horizontalIndicator active: mouseArea.pressed orientation: Qt.Horizontal size: frame.width / content.width position: -content.x / content.width anchors { left: parent.left; right: parent.right; bottom: parent.bottom } } }
另请参阅 ScrollBar , Customizing ScrollIndicator ，和 指示器控件 .
| active : bool |
This property holds whether the indicator is active, that is, when the attached Flickable is moving .
It is possible to keep both horizontal and vertical indicators visible while scrolling in either direction.
This property is automatically set when the scroll indicator is attached to a flickable .
| [read-only, since QtQuick.Controls 2.3 (Qt 5.10)] horizontal : bool |
This property holds whether the scroll indicator is horizontal.
该特性在 QtQuick.Controls 2.3 (Qt 5.10) 引入。
另请参阅 orientation .
| [since QtQuick.Controls 2.4 (Qt 5.11)] minimumSize : real |
This property holds the minimum size of the indicator, scaled to
0.0 - 1.0
.
This property was introduced in QtQuick.Controls 2.4 (Qt 5.11).
另请参阅 size , visualSize ，和 visualPosition .
| orientation : enumeration |
This property holds the orientation of the indicator.
可能的值：
| 常量 | 描述 |
|---|---|
Qt.Horizontal
|
Horizontal |
Qt.Vertical
|
Vertical (default) |
This property is automatically set when the scroll indicator is attached to a flickable .
另请参阅 horizontal and vertical .
| position : real |
This property holds the position of the indicator, scaled to
0.0 - 1.0
.
This property is automatically set when the scroll indicator is attached to a flickable .
另请参阅 Flickable::visibleArea and visualPosition .
| size : real |
This property holds the size of the indicator, scaled to
0.0 - 1.0
.
This property is automatically set when the scroll indicator is attached to a flickable .
另请参阅 Flickable::visibleArea , minimumSize ，和 visualSize .
| [read-only, since QtQuick.Controls 2.3 (Qt 5.10)] vertical : bool |
This property holds whether the scroll indicator is vertical.
该特性在 QtQuick.Controls 2.3 (Qt 5.10) 引入。
另请参阅 orientation .
| [since QtQuick.Controls 2.4 (Qt 5.11)] visualPosition : real |
This property holds the effective visual position of the indicator, which may be limited by the 最小大小 .
This property was introduced in QtQuick.Controls 2.4 (Qt 5.11).
另请参阅 position and minimumSize .
| [since QtQuick.Controls 2.4 (Qt 5.11)] visualSize : real |
This property holds the effective visual size of the indicator, which may be limited by the 最小大小 .
This property was introduced in QtQuick.Controls 2.4 (Qt 5.11).
另请参阅 size and minimumSize .
| ScrollIndicator.horizontal : ScrollIndicator |
This property attaches a horizontal scroll indicator to a Flickable .
Flickable {
contentWidth: 2000
ScrollIndicator.horizontal: ScrollIndicator { }
}
另请参阅 Attaching ScrollIndicator to a Flickable .
| ScrollIndicator.vertical : ScrollIndicator |
This property attaches a vertical scroll indicator to a Flickable .
Flickable {
contentHeight: 2000
ScrollIndicator.vertical: ScrollIndicator { }
}