Dial QML Type

Circular dial that is rotated to set a value. 更多...

导入语句: import QtQuick.Controls .
Since: Qt Quick Ultralite 1.0
继承:

Control

特性

信号

详细描述

The Dial is similar to a traditional dial knob that is found on devices such as stereos or industrial equipment. It allows the user to specify a value within a range.

The value of the dial is set using its value property. The range is set using the from and to properties. To enable or disable wrapping, use the wrap 特性。

Dial supports three input modes : Dial.Circular , Dial.Horizontal and Dial.Vertical . The circular input mode operates on an absolute input system, where the position of the cursor within the dial directly reflects its value. The horizontal and vertical input modes use a relative input system, where changes in the cursor's position are "added" to the value of the dial.

The following image illustrates the directions in which the various input modes track movement:

另请参阅 输入控件 and Controls Styling .

特性文档编制

[read-only] angle : real

This property holds the angle of the handle.

The range is from -140 degrees to 140 degrees.

另请参阅 position .


from : real

This property holds the starting value for the range. The default value is 0.0 .

另请参阅 to and value .


handle : Item

This property holds the handle of the dial.

The handle acts as a visual indicator of the position of the dial.

另请参阅 Controls Styling .


inputMode : enumeration

This property holds the input mode.

Dial supports three input modes: Dial.Circular , Dial.Horizontal and Dial.Vertical . The circular input mode operates on an absolute input system, where the position of the cursor within the dial directly reflects its value. The horizontal and vertical input modes use a relative input system, where changes in the cursor's position are "added" to the value of the dial.

The following image illustrates the directions in which the various input modes track movement:

默认值为 Dial.Circular .


live : bool

This property holds whether the dial provides live updates for the value property while the handle is dragged.

默认值为 true .

另请参阅 value .


[read-only] position : real

This property holds the logical position of the handle.

The position is expressed as a fraction of the control's angle range (the range within which the handle can be moved), which is 0.0 - 1.0 .

另请参阅 value and angle .


snapMode : enumeration

This property holds the snap mode.

The snap mode works with the stepSize to allow the handle to snap to certain points along the dial.

可能的值:

常量 描述
Dial.NoSnap The dial does not snap (default).
Dial.SnapAlways The dial snaps while the handle is dragged.
Dial.SnapOnRelease The dial does not snap while being dragged, but only after the handle is released.

另请参阅 stepSize .


stepSize : real

This property holds the step size.

The step size determines the amount by which the dial's value is increased and decreased when interacted with via the keyboard. For example, a step size of 0.2 , results in the dial's value increasing and decreasing in increments of 0.2 .

The step size is only respected for touch and mouse interaction when snapMode is set to a value other than Dial.NoSnap .

默认值为 0.0 , which results in an effective step size of 0.1 for keyboard interaction.

另请参阅 snapMode .


to : real

This property holds the end value for the range. The default value is 1.0 .

另请参阅 from and value .


value : real

This property holds a value within the from - to range. The default value is 0.0 .

另请参阅 position and live .


wrap : bool

This property holds whether the dial wraps when dragged.

For example, when this property is set to true , dragging the dial past the to position, moves the handle to the from position, and vice versa:

When this property is false , it's not possible to drag the dial across the from and to values.

默认值为 false .


信号文档编制

moved ()

This signal is emitted when the dial has been interactively moved by the user by either touch, mouse, or keys.

注意: 相应处理程序是 onMoved .