242 lines
7.8 KiB
C#
242 lines
7.8 KiB
C#
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using LemonUI.Elements;
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using System;
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using System.Drawing;
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namespace LemonUI.Menus
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{
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/// <summary>
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/// A slider item for changing integer values.
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/// </summary>
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public class NativeSliderItem : NativeSlidableItem
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{
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#region Internal Fields
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/// <summary>
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/// The background of the slider.
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/// </summary>
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internal protected ScaledRectangle background = new ScaledRectangle(PointF.Empty, SizeF.Empty)
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{
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Color = Color.FromArgb(255, 4, 32, 57)
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};
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/// <summary>
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/// THe front of the slider.
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/// </summary>
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internal protected ScaledRectangle slider = new ScaledRectangle(PointF.Empty, SizeF.Empty)
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{
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Color = Color.FromArgb(255, 57, 116, 200)
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};
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#endregion
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#region Private Fields
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/// <summary>
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/// The maximum value of the slider.
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/// </summary>
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private int maximum = 0;
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/// <summary>
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/// The current value of the slider.
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/// </summary>
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private int _value = 100;
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#endregion
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#region Public Properties
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/// <summary>
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/// The color of the Slider.
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/// </summary>
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public Color SliderColor
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{
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get => slider.Color;
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set => slider.Color = value;
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}
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/// <summary>
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/// The maximum value of the slider.
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/// </summary>
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public int Maximum
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{
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get => maximum;
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set
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{
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// If the value was not changed, return
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if (maximum == value)
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{
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return;
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}
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// Otherwise, save the new value
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maximum = value;
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// If the current value is higher than the max, set the max
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if (_value > maximum)
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{
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_value = maximum;
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ValueChanged?.Invoke(this, EventArgs.Empty);
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}
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// Finally, update the location of the slider
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UpdatePosition();
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}
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}
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/// <summary>
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/// The current value of the slider.
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/// </summary>
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public int Value
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{
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get => _value;
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set
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{
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// If the value is over the limit, raise an exception
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if (value > maximum)
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{
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throw new ArgumentOutOfRangeException(nameof(value), $"The value is over the maximum of {maximum - 1}");
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}
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// Otherwise, save it
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_value = value;
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// Trigger the respective event
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ValueChanged?.Invoke(this, EventArgs.Empty);
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// And update the location of the slider
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UpdatePosition();
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}
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}
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/// <summary>
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/// The multiplier for increasing and decreasing the value.
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/// </summary>
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public int Multiplier { get; set; } = 1;
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#endregion
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#region Event
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/// <summary>
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/// Event triggered when the value of the menu changes.
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/// </summary>
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public event EventHandler ValueChanged;
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#endregion
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#region Constructors
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/// <summary>
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/// Creates a <see cref="NativeSliderItem"/> with a maximum of 100.
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/// </summary>
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/// <param name="title">The title of the Item.</param>
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public NativeSliderItem(string title) : this(title, string.Empty, 100, 0)
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{
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}
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/// <summary>
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/// Creates a <see cref="NativeSliderItem"/> with a maximum of 100.
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/// </summary>
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/// <param name="title">The title of the Item.</param>
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/// <param name="description">The description of the Item.</param>
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public NativeSliderItem(string title, string description) : this(title, description, 100, 0)
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{
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}
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/// <summary>
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/// Creates a <see cref="NativeSliderItem"/> with a specific current and maximum value.
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/// </summary>
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/// <param name="title">The title of the Item.</param>
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/// <param name="max">The maximum value of the Slider.</param>
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/// <param name="value">The current value of the Slider.</param>
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public NativeSliderItem(string title, int max, int value) : this(title, string.Empty, max, value)
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{
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}
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/// <summary>
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/// Creates a <see cref="NativeSliderItem"/> with a specific maximum.
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/// </summary>
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/// <param name="title">The title of the Item.</param>
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/// <param name="description">The description of the Item.</param>
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/// <param name="max">The maximum value of the Slider.</param>
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/// <param name="value">The current value of the Slider.</param>
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public NativeSliderItem(string title, string description, int max, int value) : base(title, description)
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{
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maximum = max;
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_value = value;
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}
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#endregion
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#region Internal Functions
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/// <summary>
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/// Updates the position of the bar based on the value.
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/// </summary>
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internal protected void UpdatePosition()
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{
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// Calculate the increment, and then the value of X
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float increment = _value / (float)maximum;
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float x = (background.Size.Width - slider.Size.Width) * increment;
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// Then, add the X to the slider position
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slider.Position = new PointF(background.Position.X + x, background.Position.Y);
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}
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#endregion
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#region Public Functions
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/// <summary>
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/// Recalculates the item positions and sizes with the specified values.
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/// </summary>
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/// <param name="pos">The position of the item.</param>
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/// <param name="size">The size of the item.</param>
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/// <param name="selected">If this item has been selected.</param>
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public override void Recalculate(PointF pos, SizeF size, bool selected)
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{
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base.Recalculate(pos, size, selected);
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// Set the position and size of the background
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background.Size = new SizeF(150, 9);
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background.Position = new PointF(pos.X + size.Width - background.Size.Width - 7 - LeftArrow.Size.Width, pos.Y + 14);
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// And do the same for the left arrow
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LeftArrow.Position = new PointF(background.Position.X - LeftArrow.Size.Width, pos.Y + 4);
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// Finally, set the correct position of the slider
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slider.Size = new SizeF(75, 9);
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UpdatePosition();
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}
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/// <summary>
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/// Reduces the value of the slider.
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/// </summary>
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public override void GoLeft()
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{
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// Calculate the new value
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int newValue = _value - Multiplier;
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// If is under zero, set it to zero
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if (newValue < 0)
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{
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Value = 0;
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}
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// Otherwise, set it to the new value
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else
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{
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Value = newValue;
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}
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}
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/// <summary>
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/// Increases the value of the slider.
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/// </summary>
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public override void GoRight()
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{
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// Calculate the new value
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int newValue = _value + Multiplier;
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// If the value is over the maximum, set the max
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if (newValue > maximum)
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{
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Value = maximum;
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}
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// Otherwise, set the calculated value
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else
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{
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Value = newValue;
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}
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}
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/// <summary>
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/// Draws the slider.
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/// </summary>
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public override void Draw()
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{
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base.Draw(); // Arrows, Title and Left Badge
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background.Draw();
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slider.Draw();
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}
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#endregion
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}
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}
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