gotop/vendor/github.com/cjbassi/termui/block.go

101 lines
3.0 KiB
Go

package termui
import (
"image"
)
// Block is a base struct for all other upper level widgets.
type Block struct {
Grid image.Rectangle
X int // largest X value in the inner square
Y int // largest Y value in the inner square
XOffset int // the X position of the widget on the terminal
YOffset int // the Y position of the widget on the terminal
Label string
BorderFg Color
BorderBg Color
LabelFg Color
LabelBg Color
Fg Color
Bg Color
}
// NewBlock returns a *Block which inherits styles from the current theme.
func NewBlock() *Block {
return &Block{
Fg: Theme.Fg,
Bg: Theme.Bg,
BorderFg: Theme.BorderFg,
BorderBg: Theme.BorderBg,
LabelFg: Theme.LabelFg,
LabelBg: Theme.LabelBg,
}
}
func (self *Block) drawBorder(buf *Buffer) {
x := self.X + 1
y := self.Y + 1
// draw lines
buf.Merge(NewFilledBuffer(0, 0, x, 1, Cell{HORIZONTAL_LINE, self.BorderFg, self.BorderBg}))
buf.Merge(NewFilledBuffer(0, y, x, y+1, Cell{HORIZONTAL_LINE, self.BorderFg, self.BorderBg}))
buf.Merge(NewFilledBuffer(0, 0, 1, y+1, Cell{VERTICAL_LINE, self.BorderFg, self.BorderBg}))
buf.Merge(NewFilledBuffer(x, 0, x+1, y+1, Cell{VERTICAL_LINE, self.BorderFg, self.BorderBg}))
// draw corners
buf.SetCell(0, 0, Cell{TOP_LEFT, self.BorderFg, self.BorderBg})
buf.SetCell(x, 0, Cell{TOP_RIGHT, self.BorderFg, self.BorderBg})
buf.SetCell(0, y, Cell{BOTTOM_LEFT, self.BorderFg, self.BorderBg})
buf.SetCell(x, y, Cell{BOTTOM_RIGHT, self.BorderFg, self.BorderBg})
}
func (self *Block) drawLabel(buf *Buffer) {
r := MaxString(self.Label, (self.X-3)-1)
buf.SetString(3, 0, r, self.LabelFg, self.LabelBg)
if self.Label == "" {
return
}
c := Cell{' ', self.Fg, self.Bg}
buf.SetCell(2, 0, c)
if len(self.Label)+3 < self.X {
buf.SetCell(len(self.Label)+3, 0, c)
} else {
buf.SetCell(self.X-1, 0, c)
}
}
// Resize computes Height, Width, XOffset, and YOffset given terminal dimensions.
func (self *Block) Resize(termWidth, termHeight, termCols, termRows int) {
self.X = int((float64(self.Grid.Dx())/float64(termCols))*float64(termWidth)) - 2
self.Y = int((float64(self.Grid.Dy())/float64(termRows))*float64(termHeight)) - 2
self.XOffset = int((float64(self.Grid.Min.X) / float64(termCols)) * float64(termWidth))
self.YOffset = int((float64(self.Grid.Min.Y) / float64(termRows)) * float64(termHeight))
}
// SetGrid create a rectangle representing the block's dimensions in the grid.
func (self *Block) SetGrid(c0, r0, c1, r1 int) {
self.Grid = image.Rect(c0, r0, c1, r1)
}
// GetXOffset implements Bufferer interface.
func (self *Block) GetXOffset() int {
return self.XOffset
}
// GetYOffset implements Bufferer interface.
func (self *Block) GetYOffset() int {
return self.YOffset
}
// Buffer implements Bufferer interface and draws background, border, and borderlabel.
func (self *Block) Buffer() *Buffer {
buf := NewBuffer()
buf.SetAreaXY(self.X+2, self.Y+2)
buf.Fill(Cell{' ', ColorDefault, self.Bg})
self.drawBorder(buf)
self.drawLabel(buf)
return buf
}