99 lines
2.6 KiB
Go
99 lines
2.6 KiB
Go
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package termui
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import "image"
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// Block is a base struct for all other upper level widgets,
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// consider it as css: display:block.
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// Normally you do not need to create it manually.
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type Block struct {
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Grid image.Rectangle
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X int
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Y int
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XOffset int
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YOffset int
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Label string
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BorderFg Attribute
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BorderBg Attribute
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LabelFg Attribute
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LabelBg Attribute
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Bg Attribute
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Fg Attribute
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}
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// NewBlock returns a *Block which inherits styles from current theme.
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func NewBlock() *Block {
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return &Block{
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Fg: Theme.Fg,
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Bg: Theme.Bg,
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BorderFg: Theme.BorderFg,
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BorderBg: Theme.BorderBg,
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LabelFg: Theme.LabelFg,
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LabelBg: Theme.LabelBg,
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}
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}
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// Buffer draws a box border.
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func (b *Block) drawBorder(buf *Buffer) {
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x := b.X + 1
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y := b.Y + 1
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// draw lines
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buf.Merge(NewFilledBuffer(0, 0, x, 1, Cell{HORIZONTAL_LINE, b.BorderFg, b.BorderBg}))
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buf.Merge(NewFilledBuffer(0, y, x, y+1, Cell{HORIZONTAL_LINE, b.BorderFg, b.BorderBg}))
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buf.Merge(NewFilledBuffer(0, 0, 1, y+1, Cell{VERTICAL_LINE, b.BorderFg, b.BorderBg}))
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buf.Merge(NewFilledBuffer(x, 0, x+1, y+1, Cell{VERTICAL_LINE, b.BorderFg, b.BorderBg}))
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// draw corners
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buf.SetCell(0, 0, Cell{TOP_LEFT, b.BorderFg, b.BorderBg})
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buf.SetCell(x, 0, Cell{TOP_RIGHT, b.BorderFg, b.BorderBg})
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buf.SetCell(0, y, Cell{BOTTOM_LEFT, b.BorderFg, b.BorderBg})
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buf.SetCell(x, y, Cell{BOTTOM_RIGHT, b.BorderFg, b.BorderBg})
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}
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func (b *Block) drawLabel(buf *Buffer) {
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r := MaxString(b.Label, (b.X-3)-1)
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buf.SetString(3, 0, r, b.LabelFg, b.LabelBg)
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if b.Label == "" {
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return
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}
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c := Cell{' ', b.Fg, b.Bg}
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buf.SetCell(2, 0, c)
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if len(b.Label)+3 < b.X {
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buf.SetCell(len(b.Label)+3, 0, c)
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} else {
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buf.SetCell(b.X-1, 0, c)
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}
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}
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// Resize computes Height, Width, XOffset, and YOffset
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func (b *Block) Resize(termWidth, termHeight, termCols, termRows int) {
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b.X = int((float64(b.Grid.Dx())/float64(termCols))*float64(termWidth)) - 2
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b.Y = int((float64(b.Grid.Dy())/float64(termRows))*float64(termHeight)) - 2
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b.XOffset = int(((float64(b.Grid.Min.X) / float64(termCols)) * float64(termWidth)))
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b.YOffset = int(((float64(b.Grid.Min.Y) / float64(termRows)) * float64(termHeight)))
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}
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func (b *Block) SetGrid(c0, r0, c1, r1 int) {
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b.Grid = image.Rect(c0, r0, c1, r1)
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}
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func (b *Block) GetXOffset() int {
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return b.XOffset
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}
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func (b *Block) GetYOffset() int {
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return b.YOffset
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}
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// Buffer implements Bufferer interface and draws background and border
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func (b *Block) Buffer() *Buffer {
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buf := NewBuffer()
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buf.SetAreaXY(b.X+2, b.Y+2)
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buf.Fill(Cell{' ', ColorDefault, b.Bg})
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b.drawBorder(buf)
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b.drawLabel(buf)
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return buf
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}
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