mirror of https://github.com/rivo/tview.git
116 lines
2.8 KiB
Go
116 lines
2.8 KiB
Go
package tview
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import "github.com/gdamore/tcell"
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// Configuration values.
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const (
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FlexRow = iota
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FlexColumn
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)
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// flexItem holds layout options for one item.
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type flexItem struct {
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Item Primitive // The item to be positioned.
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FixedSize int // The item's fixed size which may not be changed, 0 if it has no fixed size.
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}
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// Flex is a basic implementation of a flexbox layout.
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type Flex struct {
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x, y, width, height int // The size and position of this primitive.
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items []flexItem // The items to be positioned.
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direction int // FlexRow or FlexColumn.
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}
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// NewFlex returns a new flexbox layout container with the given primitives.
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// The items all have no fixed size. If more control is needed, call AddItem().
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// The direction argument must be FlexRow or FlexColumn.
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func NewFlex(direction int, items []Primitive) *Flex {
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box := &Flex{
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width: 15,
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height: 10,
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direction: direction,
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}
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for _, item := range items {
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box.items = append(box.items, flexItem{Item: item})
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}
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return box
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}
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// AddItem adds a new item to the container. fixedSize is a size that may not be
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// changed. A value of 0 means that its size may be changed.
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func (f *Flex) AddItem(item Primitive, fixedSize int) *Flex {
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f.items = append(f.items, flexItem{Item: item, FixedSize: fixedSize})
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return f
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}
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// Draw draws this primitive onto the screen.
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func (f *Flex) Draw(screen tcell.Screen) {
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// Calculate size and position of the items.
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// How much space can we distribute?
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var variables int
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distSize := f.width
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if f.direction == FlexRow {
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distSize = f.height
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}
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for _, item := range f.items {
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if item.FixedSize > 0 {
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distSize -= item.FixedSize
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} else {
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variables++
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}
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}
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// Calculate positions and draw items.
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pos := f.x
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if f.direction == FlexRow {
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pos = f.y
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}
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for _, item := range f.items {
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size := item.FixedSize
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if size <= 0 {
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size = distSize / variables
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distSize -= size
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variables--
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}
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if f.direction == FlexColumn {
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item.Item.SetRect(pos, f.y, size, f.height)
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} else {
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item.Item.SetRect(f.x, pos, f.width, size)
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}
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pos += size
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item.Item.Draw(screen)
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}
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}
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// GetRect returns the current position of the primitive, x, y, width, and
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// height.
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func (f *Flex) GetRect() (int, int, int, int) {
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return f.x, f.y, f.width, f.height
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}
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// SetRect sets a new position of the primitive.
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func (f *Flex) SetRect(x, y, width, height int) {
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f.x = x
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f.y = y
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f.width = width
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f.height = height
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}
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// InputHandler returns nil.
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func (f *Flex) InputHandler() func(event *tcell.EventKey, setFocus func(p Primitive)) {
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return nil
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}
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// Focus is called when this primitive receives focus.
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func (f *Flex) Focus(delegate func(p Primitive)) {
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if len(f.items) > 0 {
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delegate(f.items[0].Item)
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}
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}
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// Blur is called when this primitive loses focus.
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func (f *Flex) Blur() {
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}
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