package layouts import "image" import "golang.org/x/image/math/fixed" import "git.tebibyte.media/sashakoshka/tomo" import "git.tebibyte.media/sashakoshka/tomo/artist" import "git.tebibyte.media/sashakoshka/tomo/fixedutil" // Horizontal arranges elements horizontally. Elements at the start of the entry // list will be positioned on the left, and elements at the end of the entry // list will positioned on the right. All elements have the same height. type Horizontal struct { // If Gap is true, a gap will be placed between each element. Gap bool // If Pad is true, there will be padding running along the inside of the // layout's border. Pad bool } // Arrange arranges a list of entries horizontally. func (layout Horizontal) Arrange ( entries []tomo.LayoutEntry, margin image.Point, padding artist.Inset, bounds image.Rectangle, ) { if layout.Pad { bounds = padding.Apply(bounds) } // get width of expanding elements expandingElementWidth := layout.expandingElementWidth ( entries, margin, padding, bounds.Dx()) // set the size and position of each element dot := fixedutil.Pt(bounds.Min) for index, entry := range entries { if index > 0 && layout.Gap { dot.X += fixed.I(margin.X) } entry.Bounds.Min = fixedutil.FloorPt(dot) entryWidth := fixed.Int26_6(0) if entry.Expand { entryWidth = expandingElementWidth } else { min, _ := entry.MinimumSize() entryWidth = fixed.I(min) } dot.X += entryWidth entry.Bounds.Max = entry.Bounds.Min.Add ( image.Pt(entryWidth.Floor(), bounds.Dy())) entries[index] = entry } } // MinimumSize returns the minimum width and height that will be needed to // arrange the given list of entries. func (layout Horizontal) MinimumSize ( entries []tomo.LayoutEntry, margin image.Point, padding artist.Inset, ) ( width, height int, ) { for index, entry := range entries { entryWidth, entryHeight := entry.MinimumSize() if entryHeight > height { height = entryHeight } width += entryWidth if layout.Gap && index > 0 { width += margin.X } } if layout.Pad { width += padding.Horizontal() height += padding.Vertical() } return } func (layout Horizontal) expandingElementWidth ( entries []tomo.LayoutEntry, margin image.Point, padding artist.Inset, freeSpace int, ) ( width fixed.Int26_6, ) { expandingElements := 0 // count the number of expanding elements and the amount of free space // for them to collectively occupy for index, entry := range entries { if entry.Expand { expandingElements ++ } else { entryMinWidth, _ := entry.MinimumSize() freeSpace -= entryMinWidth } if index > 0 && layout.Gap { freeSpace -= margin.X } } if expandingElements > 0 { width = fixed.I(freeSpace) / fixed.Int26_6(expandingElements) } return }