With this LookAndFeel customization, I replaced the normal draggable circle thumb, with the value of the slider.
This was useful to me, and I am sharing my class here in case it may be useful to others too.
Disclaimer:
I can’t guarantee that this tip won’t bore you to death, make you spontaneously combust, get a heart attack, make you jump out the window, or get you kidnapped by aliens.
Class coming now, last warning, you still have a chance to exit!
class ValueOnSliderlLookAndFeel : public LookAndFeel_V4 {
public:
void drawLinearSlider (Graphics& g, int x, int y, int width, int height,
float sliderPos, float minSliderPos, float maxSliderPos,
const Slider::SliderStyle style, Slider& slider) override
{
g.fillAll (slider.findColour (Slider::backgroundColourId));
if (style == Slider::LinearBar || style == Slider::LinearBarVertical)
{
Path p;
if (style == Slider::LinearBarVertical)
p.addRectangle ((float) x, sliderPos, (float) width, 1.0f +
height - sliderPos);
else
p.addRectangle ((float) x, (float) y, sliderPos - x, (float) height);
auto baseColour = slider.findColour (Slider::rotarySliderFillColourId)
.withMultipliedSaturation (slider.isEnabled () ? 1.0f : 0.5f)
.withMultipliedAlpha (0.8f);
g.setColour (baseColour);
g.fillPath (p);
auto lineThickness = jmin (15.0f, jmin (width, height) * 0.45f) * 0.1f;
g.drawRect (slider.getLocalBounds ().toFloat (), lineThickness);
}
else
{
drawLinearSliderBackground (g, x, y, width, height, sliderPos,
minSliderPos, maxSliderPos, style, slider);
drawLinearSliderThumb (g, x, y, width, height, sliderPos,
minSliderPos, maxSliderPos, style, slider);
}
}
void drawLinearSliderThumb (Graphics& g, int x, int y, int width, int height,
float sliderPos, float minSliderPos, float maxSliderPos,
const Slider::SliderStyle style, Slider& slider) override
{
auto sliderRadius = (float) (getSliderThumbRadius (slider) - 2);
auto isDownOrDragging = slider.isEnabled () &&
(slider.isMouseOverOrDragging () || slider.isMouseButtonDown ());
auto knobColour = slider.findColour (Slider::thumbColourId)
.withMultipliedSaturation ((slider.hasKeyboardFocus (false) ||
isDownOrDragging) ? 1.3f : 0.9f)
.withMultipliedAlpha (slider.isEnabled () ? 1.0f : 0.7f);
auto isMouseOver = slider.isMouseOverOrDragging () && slider.isEnabled ();
float kx, ky;
if (style == Slider::LinearVertical)
{
kx = x + width * 0.5f;
ky = sliderPos;
}
else
{
kx = sliderPos;
ky = y + height * 0.5f;
}
// Value
float fontSize = sliderRadius * 1.4f;
g.setFont (fontSize);
g.setColour (slider.findColour (Slider::thumbColourId).withAlpha
(isMouseOver ? 1.0f : 0.7f));
g.drawSingleLineText (String (slider.getValue ()), kx +
fontSize * 0.67f - sliderRadius, ky + fontSize * 1.1f - sliderRadius,
Justification::centred);
}
};
