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