property color BarColor = XFlat::ColorXFlatYellow;

The property 'BarColor' defines the color of the rotating bar.

property int32 CurrentValue = 50;

The property 'CurrentValue' stores the momentary value of the widget. The value is limited automatically to the range from MinValue to MaxValue.

var Resources::Bitmap Indicator = XFlat::WheelLargeIndicator;

The variable 'Indicator' contains the bitmap resource, that is used to draw the rotating indicator bar. The image has to contain the top left quarter of a circular object.

var float IndicatorAngle = 0.0;

Current angle of indicator.

var Resources::Bitmap Knob = XFlat::Knob;

The variable 'Knob' contains the bitmap resource, that is used to draw the rotating knob over the bar.

var float KnobAngle = 0.0;

Current angle of knob.

property int32 MaxValue = 100;

The property 'MaxValue' defines the upper boundary of the widgets value range.

property int32 MinValue = 0;

The property 'MinValue' defines the lower boundary of the widgets value range.

property int32 NominalValue = 80;

The property 'NominalValue' stores the nominal (set) value of the widget. The rotation angle of the needle corresponds to the nominal value. The value is limited automatically to the range from MinValue to MaxValue.

property slot OnApply = null;

The property 'OnApply' can refer to a slot method, which will receive a signal when the user has released the slider. Thereupon the method's logic will be executed.

property slot OnChange = null;

The property 'OnChange' can refer to a slot method, which will receive a signal each time the user has changed the value of the slider. Thereupon the method's logic will be executed.

property ^int32 OutletCurrent = null;

The property 'Outlet' provides an interface for the Model-View-Controller (MVC). In the MVC, the widgets (views, controllers) and the application logic (model) are always kept apart. An automatism behind this model ensures, that widgets are notified automatically as soon as the affected model has changed its state. On the other hand, user interactions on a widget cause the affected model to execute the application logic. Usually, a model is a simple Chora object containing several properties and the implementation of onget/onset method.

By assigning a property reference, Outlet establishes a connection between the widget and the model object, the affected property belongs to. After this, the widget is able to read and modify the referred property in response to the user interactions. It is also able to adapt the widget appearance, if the value of the referred property has been modified by another widget or by the application logic itself.

property ^int32 OutletNominal = null;

The property 'Outlet' provides an interface for the Model-View-Controller (MVC). In the MVC, the widgets (views, controllers) and the application logic (model) are always kept apart. An automatism behind this model ensures, that widgets are notified automatically as soon as the affected model has changed its state. On the other hand, user interactions on a widget cause the affected model to execute the application logic. Usually, a model is a simple Chora object containing several properties and the implementation of onget/onset method.

By assigning a property reference, Outlet establishes a connection between the widget and the model object, the affected property belongs to. After this, the widget is able to read and modify the referred property in response to the user interactions. It is also able to adapt the widget appearance, if the value of the referred property has been modified by another widget or by the application logic itself.

var Resources::Bitmap Track = XFlat::WheelLargeTrack;

The variable 'Indicator' contains the bitmap resource, that is used to draw the rotating indicator bar. The image has to contain the top left quarter of a circular object.

property string Unit = "xy";

The property 'Unit' stores the text to display in combination with the NominalValue.

method void drawIndicator
(
arg Graphics::Canvas aCanvas,
arg rect aClip,
arg int32 aX,
arg int32 aY,
arg float aAngle,
arg color aColor,
arg int32 aOpacity,
arg bool aBlend
);

The method 'drawIndicator' is used to draw the colored indicator over the background.

method void drawKnob
(
arg Graphics::Canvas aCanvas,
arg rect aClip,
arg int32 aX,
arg int32 aY,
arg float aAngle,
arg int32 aOpacity,
arg bool aBlend
);

The method 'drawKnob' is used to draw the knob over the indicator bar.

method void drawTrack
(
arg Graphics::Canvas aCanvas,
arg rect aClip,
arg int32 aX,
arg int32 aY,
arg float aAngle,
arg int32 aOpacity,
arg bool aBlend
);

The method 'drawTrack' is used to draw the white track around the colored indicator from 0 to position of the knob.

slot onEndSlot;

This internal slot method is used to receive the corresponding signals form the touch handler.

slot onRotateSlot;

This internal slot method is used to receive the corresponding signals form the touch handler.

slot onStartSlot;

This internal slot method is used to receive the corresponding signals form the touch handler.

slot outletCurrentSlot;

This slot method will receive a signal, if the value of the property assigned to Outlet has been changed by another widget or by the application logic. In response to this notification, the widget will update itself.

slot outletNominalSlot;

This slot method will receive a signal, if the value of the property assigned to Outlet has been changed by another widget or by the application logic. In response to this notification, the widget will update itself.

var int32 startValue = 0;

This variable stores the Value at the beginning of the user interaction.