Sliderline control

Slider control to select value on a scale

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Sourcecode
Please see the UgSliderControlDemo project for the source code created in this chapter. See Installing examples for information on how to download the examples from https://github.com/scadedoc/UgExamples/tree/master/UgSliderControlDemo

Introduction

The SliderLine control is a range control that allows you to set a range. We will rename sliderline to slider control in one of our future releases.

SliderLine Properties and Methods

Variable	Description	Comment
onSlide: [SCDWidgetsSlideLineEvent]	Array to append slide events. It has both the oldValue and newValue attributes.	oldValueis the value before the slide, whilenewValue* is the value after the slide.
position	Current position within the range	Type Int
minValue	Minimum range	Type Int. Default 1
maxValue	Maximum range	Type Int. Default 100
Background Line	It sets the color of the sliderline's inactive part.	Type Color
Foreground Line	It decides what color the slider line's active area will be.	Type Color
Thumb	an object that moves horizontally anytime the sliderline control is dragged.	Can be set to either None, Rect, Circle, Elipse or Image
Bullet	For adjusting the size of the Thumb	Width, Height and Opacity
touchState	.began .changed .ended

Working with the SliderLine Control

Create a new page
Drag and drop the sliderline control on the page
Name the control sliderLine
Use the sliderline control's layout properties to size and position it

Use the page editor panel to change the sliderline control properties from their respective default values

Set the label.text from within the event via SCDWidgetsSliderLineEventHandler. Ensure to cast ev.newValue to a string before assigning it to label.text for displaying the sliding percentage progress.

import ScadeKit
  
class MainPageAdapter: SCDLatticePageAdapter {

  var percentage: String = "0"

  // page adapter initialization
  override func load(_ path: String) {
    super.load(path)
    sliderLine.onSlide.append(SCDWidgetsSliderLineEventHandler { ev in self.onSlide(ev: ev!) })
  }

  func onSlide(ev: SCDWidgetsSliderLineEvent) {

    let oldValue = ev.oldValue
    let newValue = ev.newValue
    self.percentage = "\(ev.newValue)"
    label.text = String(newValue)
    print("Old ---> new \(oldValue), \(newValue)")
  }
}

This results in

Configuring SliderLine Properties Programmatically

Add the ScadeExtensions repo dependency under the dependencies section of the Package.swift file of your project as it's required for using theScadeUI library.

.package(name: "ScadeExtensions", url: "https://github.com/scade-platform/ScadeExtensions", .branch("main"))

Currently, using the ScadeUI dependency is required to programmatically configure the sliderline properties such as the bullet, backgroundLine, and foregroundLine.

import ScadeKit
import ScadeUI

class MainPageAdapter: SCDLatticePageAdapter {

  // page adapter initialization
  override func load(_ path: String) {
    super.load(path)

    sliderLine.bullet?.width = 28
    sliderLine.bullet?.height = 28
    sliderLine.backgroundLine?.height = 2
    sliderLine.backgroundLine?.opacity = 100
    sliderLine.foregroundLine?.height = 2
    sliderLine.foregroundLine?.opacity = 100
  }
}

onSlide() Method with the ScadeUI Library

Additionally, with the help of the ScadeUI library, you can also listen to events via the onSlide() method without using the SCDWidgetsSliderLineEventHandler.

import ScadeKit
import ScadeUI

class MainPageAdapter: SCDLatticePageAdapter {

  var percentage: String = "0"

  // page adapter initialization
  override func load(_ path: String) {
    super.load(path)
    sliderLine.onSlide { event in
      print(event.newValue, event.oldValue)
      self.percentage = "\(event.newValue)"
      self.label.text = String(event.newValue)
    }
  }
}

Updated 18 days ago