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// Copyright 2016 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
import "image"
// Hline is a horizontal line.
type Hline struct {
X int
Y int
Len int
Fg Attribute
Bg Attribute
}
// Vline is a vertical line.
type Vline struct {
X int
Y int
Len int
Fg Attribute
Bg Attribute
}
// Buffer draws a horizontal line.
func (l Hline) Buffer() Buffer {
if l.Len <= 0 {
return NewBuffer()
}
return NewFilledBuffer(l.X, l.Y, l.X+l.Len, l.Y+1, HORIZONTAL_LINE, l.Fg, l.Bg)
}
// Buffer draws a vertical line.
func (l Vline) Buffer() Buffer {
if l.Len <= 0 {
return NewBuffer()
}
return NewFilledBuffer(l.X, l.Y, l.X+1, l.Y+l.Len, VERTICAL_LINE, l.Fg, l.Bg)
}
// Buffer draws a box border.
func (b Block) drawBorder(buf Buffer) {
if !b.Border {
return
}
min := b.area.Min
max := b.area.Max
x0 := min.X
y0 := min.Y
x1 := max.X - 1
y1 := max.Y - 1
// draw lines
if b.BorderTop {
buf.Merge(Hline{x0, y0, x1 - x0, b.BorderFg, b.BorderBg}.Buffer())
}
if b.BorderBottom {
buf.Merge(Hline{x0, y1, x1 - x0, b.BorderFg, b.BorderBg}.Buffer())
}
if b.BorderLeft {
buf.Merge(Vline{x0, y0, y1 - y0, b.BorderFg, b.BorderBg}.Buffer())
}
if b.BorderRight {
buf.Merge(Vline{x1, y0, y1 - y0, b.BorderFg, b.BorderBg}.Buffer())
}
// draw corners
if b.BorderTop && b.BorderLeft && b.area.Dx() > 0 && b.area.Dy() > 0 {
buf.Set(x0, y0, Cell{TOP_LEFT, b.BorderFg, b.BorderBg})
}
if b.BorderTop && b.BorderRight && b.area.Dx() > 1 && b.area.Dy() > 0 {
buf.Set(x1, y0, Cell{TOP_RIGHT, b.BorderFg, b.BorderBg})
}
if b.BorderBottom && b.BorderLeft && b.area.Dx() > 0 && b.area.Dy() > 1 {
buf.Set(x0, y1, Cell{BOTTOM_LEFT, b.BorderFg, b.BorderBg})
}
if b.BorderBottom && b.BorderRight && b.area.Dx() > 1 && b.area.Dy() > 1 {
buf.Set(x1, y1, Cell{BOTTOM_RIGHT, b.BorderFg, b.BorderBg})
}
}
func (b Block) drawBorderLabel(buf Buffer) {
maxTxtW := b.area.Dx() - 2
tx := DTrimTxCls(DefaultTxBuilder.Build(b.BorderLabel, b.BorderLabelFg, b.BorderLabelBg), maxTxtW)
for i, w := 0, 0; i < len(tx); i++ {
buf.Set(b.area.Min.X+1+w, b.area.Min.Y, tx[i])
w += tx[i].Width()
}
}
// 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 {
area image.Rectangle
innerArea image.Rectangle
X int
Y int
Border bool
BorderFg Attribute
BorderBg Attribute
BorderLeft bool
BorderRight bool
BorderTop bool
BorderBottom bool
BorderLabel string
BorderLabelFg Attribute
BorderLabelBg Attribute
Display bool
Bg Attribute
Width int
Height int
PaddingTop int
PaddingBottom int
PaddingLeft int
PaddingRight int
id string
Float Align
}
// NewBlock returns a *Block which inherits styles from current theme.
func NewBlock() *Block {
b := Block{}
b.Display = true
b.Border = true
b.BorderLeft = true
b.BorderRight = true
b.BorderTop = true
b.BorderBottom = true
b.BorderBg = ThemeAttr("border.bg")
b.BorderFg = ThemeAttr("border.fg")
b.BorderLabelBg = ThemeAttr("label.bg")
b.BorderLabelFg = ThemeAttr("label.fg")
b.Bg = ThemeAttr("block.bg")
b.Width = 2
b.Height = 2
b.id = GenId()
b.Float = AlignNone
return &b
}
func (b Block) Id() string {
return b.id
}
// Align computes box model
func (b *Block) Align() {
// outer
b.area.Min.X = 0
b.area.Min.Y = 0
b.area.Max.X = b.Width
b.area.Max.Y = b.Height
// float
b.area = AlignArea(TermRect(), b.area, b.Float)
b.area = MoveArea(b.area, b.X, b.Y)
// inner
b.innerArea.Min.X = b.area.Min.X + b.PaddingLeft
b.innerArea.Min.Y = b.area.Min.Y + b.PaddingTop
b.innerArea.Max.X = b.area.Max.X - b.PaddingRight
b.innerArea.Max.Y = b.area.Max.Y - b.PaddingBottom
if b.Border {
if b.BorderLeft {
b.innerArea.Min.X++
}
if b.BorderRight {
b.innerArea.Max.X--
}
if b.BorderTop {
b.innerArea.Min.Y++
}
if b.BorderBottom {
b.innerArea.Max.Y--
}
}
}
// InnerBounds returns the internal bounds of the block after aligning and
// calculating the padding and border, if any.
func (b *Block) InnerBounds() image.Rectangle {
b.Align()
return b.innerArea
}
// Buffer implements Bufferer interface.
// Draw background and border (if any).
func (b *Block) Buffer() Buffer {
b.Align()
buf := NewBuffer()
buf.SetArea(b.area)
buf.Fill(' ', ColorDefault, b.Bg)
b.drawBorder(buf)
b.drawBorderLabel(buf)
return buf
}
// GetHeight implements GridBufferer.
// It returns current height of the block.
func (b Block) GetHeight() int {
return b.Height
}
// SetX implements GridBufferer interface, which sets block's x position.
func (b *Block) SetX(x int) {
b.X = x
}
// SetY implements GridBufferer interface, it sets y position for block.
func (b *Block) SetY(y int) {
b.Y = y
}
// SetWidth implements GridBuffer interface, it sets block's width.
func (b *Block) SetWidth(w int) {
b.Width = w
}
func (b Block) InnerWidth() int {
return b.innerArea.Dx()
}
func (b Block) InnerHeight() int {
return b.innerArea.Dy()
}
func (b Block) InnerX() int {
return b.innerArea.Min.X
}
func (b Block) InnerY() int { return b.innerArea.Min.Y }
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