60 lines
1.4 KiB
Go
60 lines
1.4 KiB
Go
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package tins2020
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import "github.com/veandco/go-sdl2/sdl"
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type Tooltip struct {
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ControlBase
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Text string
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}
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const tooltipBorderThickness = 1
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const tooltipHorizontalPadding = 4
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const tooltipMouseDistance = 12
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func (t *Tooltip) Handle(ctx *Context, event sdl.Event) bool {
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if len(t.Text) == 0 {
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return false
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}
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font := ctx.Fonts.Font(t.ActualFontName())
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windowW, windowH, err := ctx.Renderer.GetOutputSize()
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if err != nil {
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return false
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}
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labelW, labelH, err := font.SizeUTF8(t.Text)
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if err != nil {
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return false
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}
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mouse := ctx.MousePosition
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width := int32(labelW) + 2*tooltipBorderThickness + 2*tooltipHorizontalPadding
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height := int32(labelH) + 2*tooltipBorderThickness
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left := mouse.X + tooltipMouseDistance
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top := mouse.Y + tooltipMouseDistance
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if left+width > windowW {
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left = mouse.X - tooltipMouseDistance - width
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}
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if top+height > windowH {
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top = mouse.Y - tooltipMouseDistance - height
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}
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t.Bounds = Rect(left, top, width, height)
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return false
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}
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func (t *Tooltip) Render(ctx *Context) {
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SetDrawColor(ctx.Renderer, Black)
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ctx.Renderer.FillRect(t.Bounds.SDLPtr())
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SetDrawColor(ctx.Renderer, White)
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ctx.Renderer.DrawRect(t.Bounds.SDLPtr())
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font := t.ActualFont(ctx)
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bottomLeft := Pt(t.Bounds.X+tooltipBorderThickness+tooltipHorizontalPadding, t.Bounds.Y+t.Bounds.H-tooltipBorderThickness)
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font.RenderCopy(ctx.Renderer, t.Text, bottomLeft, White)
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}
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