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// Copyright 2015 Zack Guo <gizak@icloud.com>. All rights reserved.
// Use of this source code is governed by a MIT license that can
// be found in the LICENSE file.
package termui
// Block is a base struct for all other upper level widgets,
// consider it as css: display:block.
// Normally you do not need to create it manually.
type Block struct {
X int
Y int
Border labeledBorder
IsDisplay bool
HasBorder bool
BgColor Attribute
Width int
Height int
innerWidth int
innerHeight int
innerX int
innerY int
PaddingTop int
PaddingBottom int
PaddingLeft int
PaddingRight int
}
// NewBlock returns a *Block which inherits styles from current theme.
func NewBlock() *Block {
d := Block{}
d.IsDisplay = true
d.HasBorder = theme.HasBorder
d.Border.BgColor = theme.BorderBg
d.Border.FgColor = theme.BorderFg
d.Border.LabelBgColor = theme.BorderLabelTextBg
d.Border.LabelFgColor = theme.BorderLabelTextFg
d.BgColor = theme.BlockBg
d.Width = 2
d.Height = 2
return &d
}
// compute box model
func (d *Block) align() {
d.innerWidth = d.Width - d.PaddingLeft - d.PaddingRight
d.innerHeight = d.Height - d.PaddingTop - d.PaddingBottom
d.innerX = d.X + d.PaddingLeft
d.innerY = d.Y + d.PaddingTop
if d.HasBorder {
d.innerHeight -= 2
d.innerWidth -= 2
d.Border.X = d.X
d.Border.Y = d.Y
d.Border.Width = d.Width
d.Border.Height = d.Height
d.innerX++
d.innerY++
}
if d.innerHeight < 0 {
d.innerHeight = 0
}
if d.innerWidth < 0 {
d.innerWidth = 0
}
}
// InnerBounds returns the internal bounds of the block after aligning and
// calculating the padding and border, if any.
func (d *Block) InnerBounds() (x, y, width, height int) {
d.align()
return d.innerX, d.innerY, d.innerWidth, d.innerHeight
}
// Buffer implements Bufferer interface.
// Draw background and border (if any).
func (d *Block) Buffer() []Point {
d.align()
ps := []Point{}
if !d.IsDisplay {
return ps
}
if d.HasBorder {
ps = d.Border.Buffer()
}
for i := 0; i < d.innerWidth; i++ {
for j := 0; j < d.innerHeight; j++ {
p := Point{}
p.X = d.X + 1 + i
p.Y = d.Y + 1 + j
p.Ch = ' '
p.Bg = d.BgColor
ps = append(ps, p)
}
}
return ps
}
// GetHeight implements GridBufferer.
// It returns current height of the block.
func (d Block) GetHeight() int {
return d.Height
}
// SetX implements GridBufferer interface, which sets block's x position.
func (d *Block) SetX(x int) {
d.X = x
}
// SetY implements GridBufferer interface, it sets y position for block.
func (d *Block) SetY(y int) {
d.Y = y
}
// SetWidth implements GridBuffer interface, it sets block's width.
func (d *Block) SetWidth(w int) {
d.Width = w
}
// chop the overflow parts
func (d *Block) chopOverflow(ps []Point) []Point {
nps := make([]Point, 0, len(ps))
x := d.X
y := d.Y
w := d.Width
h := d.Height
for _, v := range ps {
if v.X >= x &&
v.X < x+w &&
v.Y >= y &&
v.Y < y+h {
nps = append(nps, v)
}
}
return nps
}
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