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// gomuks - A terminal Matrix client written in Go.
// Copyright (C) 2020 Tulir Asokan
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package html
import (
"fmt"
"strings"
"maunium.net/go/mauview"
)
type ContainerEntity struct {
*BaseEntity
// The children of this container entity.
Children []Entity
// Number of cells to indent children.
Indent int
}
// PlainText returns the plaintext content in this entity and all its children.
func (ce *ContainerEntity) PlainText() string {
if len(ce.Children) == 0 {
return ""
}
var buf strings.Builder
newlined := false
for _, child := range ce.Children {
text := child.PlainText()
if !strings.HasPrefix(text, "\n") && child.IsBlock() && !newlined {
buf.WriteRune('\n')
}
newlined = false
buf.WriteString(text)
if child.IsBlock() {
if !strings.HasSuffix(text, "\n") {
buf.WriteRune('\n')
}
newlined = true
}
}
return strings.TrimSpace(buf.String())
}
// AdjustStyle recursively changes the style of this entity and all its children.
func (ce *ContainerEntity) AdjustStyle(fn AdjustStyleFunc) Entity {
for _, child := range ce.Children {
child.AdjustStyle(fn)
}
ce.Style = fn(ce.Style)
return ce
}
// clone creates a deep copy of this base entity.
func (ce *ContainerEntity) Clone() Entity {
children := make([]Entity, len(ce.Children))
for i, child := range ce.Children {
children[i] = child.Clone()
}
return &ContainerEntity{
BaseEntity: ce.BaseEntity.Clone().(*BaseEntity),
Children: children,
Indent: ce.Indent,
}
}
// String returns a textual representation of this BaseEntity struct.
func (ce *ContainerEntity) String() string {
if len(ce.Children) == 0 {
return fmt.Sprintf(`&html.ContainerEntity{Base=%s, Indent=%d, Children=[]}`, ce.BaseEntity, ce.Indent)
}
var buf strings.Builder
_, _ = fmt.Fprintf(&buf, `&html.ContainerEntity{Base=%s,
Indent=%d, Children=[`, ce.BaseEntity, ce.Indent)
for _, child := range ce.Children {
buf.WriteString("\n ")
buf.WriteString(strings.Join(strings.Split(strings.TrimRight(child.String(), "\n"), "\n"), "\n "))
}
buf.WriteString("\n]},")
return buf.String()
}
// Draw draws this entity onto the given mauview Screen.
func (ce *ContainerEntity) Draw(screen mauview.Screen) {
if len(ce.Children) == 0 {
return
}
width, _ := screen.Size()
prevBreak := false
proxyScreen := &mauview.ProxyScreen{Parent: screen, OffsetX: ce.Indent, Width: width - ce.Indent, Style: ce.Style}
for i, entity := range ce.Children {
if i != 0 && entity.getStartX() == 0 {
proxyScreen.OffsetY++
}
proxyScreen.Height = entity.Height()
entity.Draw(proxyScreen)
proxyScreen.SetStyle(ce.Style)
proxyScreen.OffsetY += entity.Height() - 1
_, isBreak := entity.(*BreakEntity)
if prevBreak && isBreak {
proxyScreen.OffsetY++
}
prevBreak = isBreak
}
}
// CalculateBuffer prepares this entity and all its children for rendering with the given parameters
func (ce *ContainerEntity) CalculateBuffer(width, startX int, bare bool) int {
ce.BaseEntity.CalculateBuffer(width, startX, bare)
if len(ce.Children) > 0 {
ce.height = 0
childStartX := ce.startX
prevBreak := false
for _, entity := range ce.Children {
if entity.IsBlock() || childStartX == 0 || ce.height == 0 {
ce.height++
}
childStartX = entity.CalculateBuffer(width-ce.Indent, childStartX, bare)
ce.height += entity.Height() - 1
_, isBreak := entity.(*BreakEntity)
if prevBreak && isBreak {
ce.height++
}
prevBreak = isBreak
}
if !ce.Block {
return childStartX
}
}
return ce.startX
}
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