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Fix bug where viewport wouldn't render final lines

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This previously went unnoticed because we all seemed to have newlines at
the end of our viewport input.

This update introduces the Model.SetYOffset method.
This commit is contained in:
Christian Rocha 2021-09-16 11:04:08 -04:00
parent a7ea1bddbf
commit 8c03905dbe
1 changed files with 24 additions and 83 deletions
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107
viewport/viewport.go
View File

@ -45,13 +45,13 @@ func (m Model) AtTop() bool {
// AtBottom returns whether or not the viewport is at or past the very bottom
// position.
func (m Model) AtBottom() bool {
return m.YOffset >= len(m.lines)-1-m.Height
return m.YOffset >= len(m.lines)-m.Height
}
// PastBottom returns whether or not the viewport is scrolled beyond the last
// line. This can happen when adjusting the viewport height.
func (m Model) PastBottom() bool {
return m.YOffset > len(m.lines)-1-m.Height
return m.YOffset > len(m.lines)-m.Height
}
// ScrollPercent returns the amount scrolled as a float between 0 and 1.
@ -87,6 +87,11 @@ func (m Model) visibleLines() (lines []string) {
return lines
}
// SetYOffset sets the Y offset.
func (m *Model) SetYOffset(n int) {
m.YOffset = clamp(n, 0, len(m.lines)-m.Height)
}
// ViewDown moves the view down by the number of lines in the viewport.
// Basically, "page down".
func (m *Model) ViewDown() []string {
@ -94,11 +99,7 @@ func (m *Model) ViewDown() []string {
return nil
}
m.YOffset = min(
m.YOffset+m.Height, // target
len(m.lines)-1-m.Height, // fallback
)
m.SetYOffset(m.YOffset + m.Height)
return m.visibleLines()
}
@ -108,11 +109,7 @@ func (m *Model) ViewUp() []string {
return nil
}
m.YOffset = max(
m.YOffset-m.Height, // target
0, // fallback
)
m.SetYOffset(m.YOffset - m.Height)
return m.visibleLines()
}
@ -122,18 +119,8 @@ func (m *Model) HalfViewDown() (lines []string) {
return nil
}
m.YOffset = min(
m.YOffset+m.Height/2, // target
len(m.lines)-1-m.Height, // fallback
)
if len(m.lines) > 0 {
top := max(m.YOffset+m.Height/2, 0)
bottom := clamp(m.YOffset+m.Height, top, len(m.lines)-1)
lines = m.lines[top:bottom]
}
return lines
m.SetYOffset(m.YOffset + m.Height/2)
return m.visibleLines()
}
// HalfViewUp moves the view up by half the height of the viewport.
@ -142,18 +129,8 @@ func (m *Model) HalfViewUp() (lines []string) {
return nil
}
m.YOffset = max(
m.YOffset-m.Height/2, // target
0, // fallback
)
if len(m.lines) > 0 {
top := max(m.YOffset, 0)
bottom := clamp(m.YOffset+m.Height/2, top, len(m.lines)-1)
lines = m.lines[top:bottom]
}
return lines
m.SetYOffset(m.YOffset - m.Height/2)
return m.visibleLines()
}
// LineDown moves the view down by the given number of lines.
@ -165,21 +142,8 @@ func (m *Model) LineDown(n int) (lines []string) {
// Make sure the number of lines by which we're going to scroll isn't
// greater than the number of lines we actually have left before we reach
// the bottom.
maxDelta := (len(m.lines) - 1) - (m.YOffset + m.Height) // number of lines - viewport bottom edge
n = min(n, maxDelta)
m.YOffset = min(
m.YOffset+n, // target
len(m.lines)-1-m.Height, // fallback
)
if len(m.lines) > 0 {
top := max(m.YOffset+m.Height-n, 0)
bottom := clamp(m.YOffset+m.Height, top, len(m.lines)-1)
lines = m.lines[top:bottom]
}
return lines
m.SetYOffset(m.YOffset + n)
return m.visibleLines()
}
// LineUp moves the view down by the given number of lines. Returns the new
@ -191,17 +155,8 @@ func (m *Model) LineUp(n int) (lines []string) {
// Make sure the number of lines by which we're going to scroll isn't
// greater than the number of lines we are from the top.
n = min(n, m.YOffset)
m.YOffset = max(m.YOffset-n, 0)
if len(m.lines) > 0 {
top := max(0, m.YOffset)
bottom := clamp(m.YOffset+n, top, len(m.lines)-1)
lines = m.lines[top:bottom]
}
return lines
m.SetYOffset(m.YOffset - n)
return m.visibleLines()
}
// GotoTop sets the viewport to the top position.
@ -210,28 +165,14 @@ func (m *Model) GotoTop() (lines []string) {
return nil
}
m.YOffset = 0
if len(m.lines) > 0 {
top := m.YOffset
bottom := clamp(m.YOffset+m.Height, top, len(m.lines)-1)
lines = m.lines[top:bottom]
}
return lines
m.SetYOffset(0)
return m.visibleLines()
}
// GotoBottom sets the viewport to the bottom position.
func (m *Model) GotoBottom() (lines []string) {
m.YOffset = max(len(m.lines)-1-m.Height, 0)
if len(m.lines) > 0 {
top := m.YOffset
bottom := max(len(m.lines)-1, 0)
lines = m.lines[top:bottom]
}
return lines
m.SetYOffset(len(m.lines) - 1 - m.Height)
return m.visibleLines()
}
// COMMANDS
@ -360,8 +301,8 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
// View renders the viewport into a string.
func (m Model) View() string {
if m.HighPerformanceRendering {
// Just send newlines since we're doing to be rendering the actual
// content seprately. We still need send something that equals the
// Just send newlines since we're going to be rendering the actual
// content seprately. We still need to send something that equals the
// height of this view so that the Bubble Tea standard renderer can
// position anything below this view properly.
return strings.Repeat("\n", m.Height-1)
@ -372,7 +313,7 @@ func (m Model) View() string {
// Fill empty space with newlines
extraLines := ""
if len(lines) < m.Height {
extraLines = strings.Repeat("\n", m.Height-len(lines))
extraLines = strings.Repeat("\n", max(0, m.Height-len(lines)))
}
return strings.Join(lines, "\n") + extraLines