tins2020/buyflowerbutton.go

package tins2020

import (
	"fmt"
	"time"

	"github.com/veandco/go-sdl2/sdl"
)

type BuyFlowerButton struct {
	IconButton

	FlowerID    string
	Name        string
	Price       int
	Description string

	IsActive bool

	hoverAnimation *Animation
	hoverOffset    int32
	hoverTexture   *Texture
	priceTexture   *Texture
}

func NewBuyFlowerButton(icon, iconDisabled, flowerID, name string, price int, description string, isDisabled bool, onClick EventContextFn) *BuyFlowerButton {
	return &BuyFlowerButton{
		IconButton: *NewIconButtonConfig(icon, onClick, func(b *IconButton) {
			b.IconDisabled = iconDisabled
			b.IsDisabled = isDisabled
		}),
		FlowerID:    flowerID,
		Name:        name,
		Price:       price,
		Description: description,
	}
}

func (b *BuyFlowerButton) animate() {
	b.hoverOffset++
	if b.hoverOffset > b.hoverTexture.Size().X+b.Bounds.W {
		b.hoverOffset = b.priceTexture.Size().X
	}
}

func (b *BuyFlowerButton) Init(ctx *Context) error {
	text := fmt.Sprintf("%s - %s - %s", FmtMoney(b.Price), b.Name, b.Description)
	font := ctx.Fonts.Font("small")
	color := MustHexColor("#ffffff")
	texture, err := font.Render(ctx.Renderer, text, color)
	if err != nil {
		return err
	}
	b.hoverTexture = texture
	texture, err = font.Render(ctx.Renderer, FmtMoney(b.Price), color)
	if err != nil {
		return err
	}
	b.priceTexture = texture
	return nil
}

func (b *BuyFlowerButton) Handle(ctx *Context, event sdl.Event) {
	b.IconButton.Handle(ctx, event)
	if b.IsMouseOver && b.hoverAnimation == nil {
		b.hoverAnimation = NewAnimationPtr(10 * time.Millisecond)
		b.hoverOffset = b.priceTexture.Size().X
	} else if !b.IsMouseOver {
		b.hoverAnimation = nil
	}
}

func (b *BuyFlowerButton) Render(ctx *Context) {
	iconTexture := b.activeTexture(ctx)
	mouseOverTexture := ctx.Textures.Texture("control-hover")

	pos := Pt(b.Bounds.X, b.Bounds.Y)
	iconTexture.CopyResize(ctx.Renderer, RectSize(pos.X, pos.Y-40, buttonBarWidth, 120))
	if (b.IsMouseOver && !b.IsDisabled) || b.IsActive {
		mouseOverTexture.Copy(ctx.Renderer, pos)
	}

	if b.hoverAnimation != nil {
		b.hoverAnimation.AnimateFn(b.animate)
	}

	if b.IsMouseOver {
		left := buttonBarWidth - 8 - b.hoverOffset
		top := pos.Y + buttonBarWidth - 20
		if left < 0 {
			part := Rect(-left, 0, b.hoverTexture.Size().X, b.hoverTexture.Size().Y)
			b.hoverTexture.CopyPart(ctx.Renderer, part, Pt(pos.X, top))
		} else {
			b.hoverTexture.Copy(ctx.Renderer, Pt(pos.X+left, top))
		}
	} else {
		b.priceTexture.Copy(ctx.Renderer, Pt(pos.X+buttonBarWidth-8-b.priceTexture.Size().X, pos.Y+buttonBarWidth-20))
	}
}