tins2020/iconbutton.go

package tins2020

type HoverEffect int

const (
	HoverEffectLigthen HoverEffect = iota
	HoverEffectColor
)

type IconButton struct {
	ControlBase

	Icon         string
	IconDisabled string
	IconHeight   int32
	IconScale    Scale
	IconWidth    int32

	IconActive HoverEffect
	IconHover  HoverEffect

	IsActive bool
}

func NewIconButton(icon string, onClick EventContextFn) *IconButton {
	return &IconButton{
		ControlBase: ControlBase{
			OnLeftMouseButtonClick: onClick,
		},
		Icon: icon,
	}
}

func NewIconButtonConfig(icon string, onClick EventContextFn, configure func(*IconButton)) *IconButton {
	button := NewIconButton(icon, onClick)
	configure(button)
	return button
}

func (b *IconButton) activeTexture(ctx *Context) *Texture {
	if b.IsDisabled {
		texture := ctx.Textures.Texture(b.IconDisabled)
		if texture != nil {
			return texture
		}

		texture = ctx.Textures.Texture(b.Icon)
		if len(b.IconDisabled) == 0 {
			return texture
		}
		color, err := HexColor(b.IconDisabled)
		if err == nil {
			texture.SetColor(color)
		}
		return texture
	}
	return ctx.Textures.Texture(b.Icon)
}

func (b *IconButton) Render(ctx *Context) {
	iconTexture := b.activeTexture(ctx)

	hover := b.IsMouseOver && !b.IsDisabled
	if (hover && b.IconHover == HoverEffectColor) || (b.IsActive && b.IconActive == HoverEffectColor) {
		iconTexture.SetColor(MustHexColor("#15569F"))
	}

	if b.IconScale == ScaleCenter {
		size := iconTexture.Size()
		if b.IconWidth != 0 {
			size = Pt(b.IconWidth, b.IconWidth*size.Y/size.X)
		} else if b.IconHeight != 0 {
			size = Pt(b.IconHeight*size.X/size.Y, b.IconHeight)
		}
		iconTexture.CopyResize(ctx.Renderer, RectSize(b.Bounds.X+(b.Bounds.W-size.X)/2, b.Bounds.Y+(b.Bounds.H-size.Y)/2, size.X, size.Y))
	} else {
		iconTexture.CopyResize(ctx.Renderer, b.Bounds)
	}
	if (hover && b.IconHover == HoverEffectLigthen) || (b.IsActive && b.IconActive == HoverEffectLigthen) {
		SetDrawColor(ctx.Renderer, TransparentWhite)
		ctx.Renderer.FillRect(b.Bounds.SDLPtr())
	}
	iconTexture.SetColor(White)
}

type Scale int

const (
	ScaleCenter Scale = iota
	ScaleStretch
)