83 lines
1.7 KiB
Go
83 lines
1.7 KiB
Go
package tins2020
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import "github.com/veandco/go-sdl2/sdl"
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type Control interface {
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Init(*Context) error
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Arrange(*Context, Rectangle)
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Handle(*Context, sdl.Event) bool
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Render(*Context)
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}
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type EventContextFn func(*Context)
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type EventFn func()
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type EventInterfaceFn func(interface{})
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func EmptyEvent(fn EventFn) EventContextFn {
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return func(*Context) { fn() }
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}
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type ControlBase struct {
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Bounds Rectangle
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FontName string
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Foreground sdl.Color
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IsDisabled bool
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IsMouseOver bool
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OnLeftMouseButtonClick EventContextFn
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}
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func (c *ControlBase) ActualForeground() sdl.Color {
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var none sdl.Color
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if c.Foreground == none {
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return MustHexColor("#ffffff")
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}
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return c.Foreground
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}
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func (c *ControlBase) ActualFont(ctx *Context) *Font {
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name := c.ActualFontName()
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return ctx.Fonts.Font(name)
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}
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func (c *ControlBase) ActualFontName() string {
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if c.FontName == "" {
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return "default"
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}
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return c.FontName
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}
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func (b *ControlBase) Arrange(ctx *Context, bounds Rectangle) { b.Bounds = bounds }
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func (b *ControlBase) Init(*Context) error { return nil }
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func (b *ControlBase) Handle(ctx *Context, event sdl.Event) bool {
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switch e := event.(type) {
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case *sdl.MouseMotionEvent:
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b.IsMouseOver = b.Bounds.IsPointInside(e.X, e.Y)
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case *sdl.MouseButtonEvent:
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if !b.IsDisabled && b.IsMouseOver && e.Button == sdl.BUTTON_LEFT && e.Type == sdl.MOUSEBUTTONDOWN {
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return b.Invoke(ctx, b.OnLeftMouseButtonClick)
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}
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case *sdl.WindowEvent:
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if e.Event == sdl.WINDOWEVENT_LEAVE {
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b.IsMouseOver = false
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}
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}
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return false
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}
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func (b *ControlBase) Invoke(ctx *Context, fn EventContextFn) bool {
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if fn == nil {
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return false
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}
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fn(ctx)
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return true
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}
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func (b *ControlBase) Render(*Context) {}
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