OpacitySlider control is designed as the Opacity value selector. It’s the extension of the
SelectedOpacity Dependency Property of the
OpacitySlider control allows to get or set the value of Opacity. It’s of the
double type and its value is in the [0,1] range (0 means transparent, 1 – opaque, the default).
SelectedOpacity property value is synchronized with
Value properties values of the parent
Slider control. To get or set the Opacity value the caller can use both
Value properties taking into account the simple relation:
SelectedOpacity = 1.0 - (Value - Minimum) / (Maximum - Minimum);
OpacitySlider control overrides the default template of the parent
Slider control and looks like follows:
i.e. its style redefines the slider background and the constituent
Thumb control template.
As you can see at the figure above the
OpacitySlider control takes into account the parent
Orientation property and can be presented as the horizontal or the vertical bar.
The direction the Opacity value changes depends on the value of
IsDirectionReversed property. If it’s false (the default) the maximum opacity as at the left or at the bottom of the control depending on the orientation.
You can download the code and the samples here:
The archive contains my WPFGears library with samples, tests, etc. It’s the Visual Studio 2008 SP1 solution targeted to .NET Framework 3.5.
You’ll find OpacitySliderSample project there.Opacity
Slider control code is in the WPFGears library project ColorPickerControls folder.
Oleg V. Polikarpotchkin