122 lines
2.5 KiB
Go
122 lines
2.5 KiB
Go
package goterm
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import (
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"bytes"
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"strings"
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)
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const DEFAULT_BORDER = "- │ ┌ ┐ └ ┘"
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// Box allows you to create independent parts of screen, with its own buffer and borders.
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// Can be used for creating modal windows
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//
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// Generates boxes likes this:
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// ┌--------┐
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// │hello │
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// │world │
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// │ │
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// └--------┘
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//
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type Box struct {
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Buf *bytes.Buffer
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Width int
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Height int
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// To get even padding: PaddingX ~= PaddingY*4
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PaddingX int
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PaddingY int
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// Should contain 6 border pieces separated by spaces
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//
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// Example border:
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// "- │ ┌ ┐ └ ┘"
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Border string
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Flags int // Not used now
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}
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// Create new Box.
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// Width and height can be relative:
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//
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// // Create box with 50% with of current screen and 10 lines height
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// box := tm.NewBox(50|tm.PCT, 10, 0)
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//
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func NewBox(width, height int, flags int) *Box {
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width, height = GetXY(width, height)
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box := new(Box)
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box.Buf = new(bytes.Buffer)
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box.Width = width
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box.Height = height
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box.Border = DEFAULT_BORDER
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box.PaddingX = 1
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box.PaddingY = 0
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box.Flags = flags
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return box
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}
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func (b *Box) Write(p []byte) (int, error) {
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return b.Buf.Write(p)
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}
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// Render Box
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func (b *Box) String() (out string) {
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borders := strings.Split(b.Border, " ")
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lines := strings.Split(b.Buf.String(), "\n")
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// Border + padding
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prefix := borders[1] + strings.Repeat(" ", b.PaddingX)
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suffix := strings.Repeat(" ", b.PaddingX) + borders[1]
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offset := b.PaddingY + 1 // 1 is border width
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// Content width without borders and padding
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contentWidth := b.Width - (b.PaddingX+1)*2
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for y := 0; y < b.Height; y++ {
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var line string
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switch {
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// Draw borders for first line
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case y == 0:
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line = borders[2] + strings.Repeat(borders[0], b.Width-2) + borders[3]
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// Draw borders for last line
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case y == (b.Height - 1):
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line = borders[4] + strings.Repeat(borders[0], b.Width-2) + borders[5]
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// Draw top and bottom padding
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case y <= b.PaddingY || y >= (b.Height-b.PaddingY):
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line = borders[1] + strings.Repeat(" ", b.Width-2) + borders[1]
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// Render content
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default:
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if len(lines) > y-offset {
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line = lines[y-offset]
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} else {
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line = ""
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}
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if len(line) > contentWidth-1 {
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// If line is too large limit it
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line = line[0:contentWidth]
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} else {
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// If line is too small enlarge it by adding spaces
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line = line + strings.Repeat(" ", contentWidth-len(line))
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}
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line = prefix + line + suffix
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}
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// Don't add newline for last element
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if y != b.Height-1 {
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line = line + "\n"
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}
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out += line
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}
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return out
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}
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