/// <summary>
/// Ensures correct size of the widget.
/// </summary>
protected override void OnMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
var width = 200;
if (MeasureSpecMode.Unspecified != MeasureSpec.GetMode(widthMeasureSpec))
{
width = MeasureSpec.GetSize(widthMeasureSpec);
}
var height = ThumbImage.Height
+ (ShowTextAboveThumbs ? PixelUtil.DpToPx(Context, HeightInDp) + PixelUtil.SpToPx(Context, TextSizeInSp) : 0)
+ (ThumbShadow ? ThumbShadowYOffset + _thumbShadowBlur : 0);
if (MeasureSpecMode.Unspecified != MeasureSpec.GetMode(heightMeasureSpec))
{
height = Math.Min(height, MeasureSpec.GetSize(heightMeasureSpec));
}
SetMeasuredDimension(width, height);
}
private void Init(Context context, IAttributeSet attrs)
{
var thumbNormal = Resource.Drawable.seek_thumb_normal;
var thumbPressed = Resource.Drawable.seek_thumb_pressed;
var thumbDisabled = Resource.Drawable.seek_thumb_disabled;
Color thumbShadowColor;
var defaultShadowColor = Color.Argb(75, 0, 0, 0);
var defaultShadowYOffset = PixelUtil.DpToPx(context, 2);
var defaultShadowXOffset = PixelUtil.DpToPx(context, 0);
var defaultShadowBlur = PixelUtil.DpToPx(context, 2);
if (attrs == null)
{
SetRangeToDefaultValues();
_internalPad = PixelUtil.DpToPx(context, InitialPaddingInDp);
_barHeight = PixelUtil.DpToPx(context, LineHeightInDp);
ActiveColor = DefaultActiveColor;
DefaultColor = Color.Gray;
AlwaysActive = false;
ShowTextAboveThumbs = true;
TextAboveThumbsColor = Color.White;
thumbShadowColor = defaultShadowColor;
ThumbShadowXOffset = defaultShadowXOffset;
ThumbShadowYOffset = defaultShadowYOffset;
_thumbShadowBlur = defaultShadowBlur;
ActivateOnDefaultValues = false;
}
else
{
var a = Context.ObtainStyledAttributes(attrs, Resource.Styleable.RangeSliderControl, 0, 0);
try
{
SetRangeValues(ExtractNumericValueFromAttributes(a, Resource.Styleable.RangeSliderControl_absoluteMinValue, DefaultMinimum),
ExtractNumericValueFromAttributes(a, Resource.Styleable.RangeSliderControl_absoluteMaxValue, DefaultMaximum));
ShowTextAboveThumbs = a.GetBoolean(Resource.Styleable.RangeSliderControl_valuesAboveThumbs, true);
TextAboveThumbsColor = a.GetColor(Resource.Styleable.RangeSliderControl_textAboveThumbsColor, Color.White);
MinThumbHidden = a.GetBoolean(Resource.Styleable.RangeSliderControl_minThumbHidden, false);
MaxThumbHidden = a.GetBoolean(Resource.Styleable.RangeSliderControl_maxThumbHidden, false);
ShowLabels = a.GetBoolean(Resource.Styleable.RangeSliderControl_showLabels, true);
_internalPad = a.GetDimensionPixelSize(Resource.Styleable.RangeSliderControl_internalPadding, InitialPaddingInDp);
_barHeight = a.GetDimensionPixelSize(Resource.Styleable.RangeSliderControl_barHeight, LineHeightInDp);
ActiveColor = a.GetColor(Resource.Styleable.RangeSliderControl_activeColor, DefaultActiveColor);
DefaultColor = a.GetColor(Resource.Styleable.RangeSliderControl_defaultColor, Color.Gray);
AlwaysActive = a.GetBoolean(Resource.Styleable.RangeSliderControl_alwaysActive, false);
StepValue = ExtractNumericValueFromAttributes(a,
Resource.Styleable.RangeSliderControl_stepValue, DefaultStepValue);
StepValueContinuously = a.GetBoolean(Resource.Styleable.RangeSliderControl_stepValueContinuously,
false);
var normalDrawable = a.GetDrawable(Resource.Styleable.RangeSliderControl_thumbNormal);
if (normalDrawable != null)
{
ThumbImage = BitmapUtil.DrawableToBitmap(normalDrawable);
}
var disabledDrawable = a.GetDrawable(Resource.Styleable.RangeSliderControl_thumbDisabled);
if (disabledDrawable != null)
{
ThumbDisabledImage = BitmapUtil.DrawableToBitmap(disabledDrawable);
}
var pressedDrawable = a.GetDrawable(Resource.Styleable.RangeSliderControl_thumbPressed);
if (pressedDrawable != null)
{
ThumbPressedImage = BitmapUtil.DrawableToBitmap(pressedDrawable);
}
ThumbShadow = a.GetBoolean(Resource.Styleable.RangeSliderControl_thumbShadow, false);
thumbShadowColor = a.GetColor(Resource.Styleable.RangeSliderControl_thumbShadowColor, defaultShadowColor);
ThumbShadowXOffset = a.GetDimensionPixelSize(Resource.Styleable.RangeSliderControl_thumbShadowXOffset, defaultShadowXOffset);
ThumbShadowYOffset = a.GetDimensionPixelSize(Resource.Styleable.RangeSliderControl_thumbShadowYOffset, defaultShadowYOffset);
_thumbShadowBlur = a.GetDimensionPixelSize(Resource.Styleable.RangeSliderControl_thumbShadowBlur, defaultShadowBlur);
ActivateOnDefaultValues = a.GetBoolean(Resource.Styleable.RangeSliderControl_activateOnDefaultValues, false);
}
finally
{
a.Recycle();
}
}
if (ThumbImage == null)
{
ThumbImage = BitmapFactory.DecodeResource(Resources, thumbNormal);
}
if (ThumbPressedImage == null)
{
ThumbPressedImage = BitmapFactory.DecodeResource(Resources, thumbPressed);
}
if (ThumbDisabledImage == null)
{
ThumbDisabledImage = BitmapFactory.DecodeResource(Resources, thumbDisabled);
}
_thumbHalfWidth = 0.5f * ThumbImage.Width;
_thumbHalfHeight = 0.5f * ThumbImage.Height;
_textSize = PixelUtil.SpToPx(context, DefaultTextSizeInSp);
_distanceToTop = PixelUtil.DpToPx(context, DefaultTextDistanceToTopInDp);
SetBarHeight(_barHeight);
// make RangeSliderControl focusable. This solves focus handling issues in case EditText widgets are being used along with the RangeSliderControl within ScrollViews.
Focusable = true;
FocusableInTouchMode = true;
_scaledTouchSlop = ViewConfiguration.Get(Context).ScaledTouchSlop;
if (ThumbShadow)
{
// We need to remove hardware acceleration in order to blur the shadow
SetLayerType(LayerType.Software, null);
_shadowPaint.Color = thumbShadowColor;
_shadowPaint.SetMaskFilter(new BlurMaskFilter(_thumbShadowBlur, BlurMaskFilter.Blur.Normal));
_thumbShadowPath = new Path();
_thumbShadowPath.AddCircle(0, 0, _thumbHalfHeight, Path.Direction.Cw);
}
}
