// metricsFromCairo fills in the font metrics with the font metrics as
// measured on a cairo Context.
func (f *Font) metricsFromCairo(cr *cairo.Context) {
ext := cairo.FontExtents{}
cr.FontExtents(&ext)
f.cw = int(ext.MaxXAdvance)
f.ch = int(ext.Height)
f.descent = int(ext.Descent)
}
func (f *Font) Use(cr *cairo.Context, bold bool) {
weight := cairo.FontWeightNormal
if bold {
weight = cairo.FontWeightBold
}
cr.SelectFontFace(f.Name, cairo.FontSlantNormal, weight)
cr.SetFontSize(float64(f.Size))
if f.cw == 0 {
f.metricsFromCairo(cr)
}
}
func drawText(cr *cairo.Context, mf *Font, x, y int, fg, bg *Color, line string) {
if bg != nil {
setColor(cr, bg)
cr.Rectangle(float64(x), float64(y),
float64(len(line)*mf.cw), float64(mf.ch))
cr.Fill()
}
cr.MoveTo(float64(x), float64(y+mf.ch-mf.descent))
setColor(cr, fg)
cr.ShowText(line)
}
func (l *LogView) Draw(cr *cairo.Context) {
cr.Translate(0, float64(-l.scrollOffset))
y := 0
for _, e := range l.Entries {
h := e.prompt.Height()
if y+h >= l.scrollOffset {
e.prompt.Draw(cr)
}
y += h
cr.Translate(0, float64(h))
if e.term != nil {
h = e.term.Height()
if y+h >= l.scrollOffset {
e.term.Draw(cr)
}
y += h
cr.Translate(0, float64(h))
}
}
if y > l.height {
scrollOffset := y - l.height
if l.scrollOffset != scrollOffset {
if l.scrollAnim != nil && l.scrollAnim.Done {
l.scrollAnim = nil
}
if l.scrollAnim == nil {
l.scrollAnim = ui.NewLerp(&l.scrollOffset, scrollOffset, 40*time.Millisecond)
l.GetWindow().win.AddAnimation(l.scrollAnim)
} else {
// TODO adjust existing anim
}
}
}
}
func (t *TermView) Draw(cr *cairo.Context) {
t.mf.Use(cr, false)
t.termMu.Lock()
defer t.termMu.Unlock()
offset := t.term.Top * t.mf.ch
offset = 0
if offset > 0 {
cr.Save()
defer cr.Restore()
cr.Translate(0, float64(-offset))
}
firstLine := offset / t.mf.ch
if firstLine < 0 {
firstLine = 0
}
lastLine := t.term.Top + t.term.Height
if lastLine > len(t.term.Lines) {
lastLine = len(t.term.Lines)
}
for row := firstLine; row < lastLine; row++ {
drawTerminalLine(cr, t.mf, row*t.mf.ch, t.term.Lines[row])
}
if !t.term.HideCursor {
ch := rune(0)
if t.term.Row < len(t.term.Lines) &&
t.term.Col < len(t.term.Lines[t.term.Row]) {
ch = t.term.Lines[t.term.Row][t.term.Col].Ch
}
drawCursor(cr, t.mf, t.term.Row, t.term.Col, ch)
}
}
func setColor(cr *cairo.Context, color *Color) {
cr.SetSourceRGB(float64(color.R)/0xff, float64(color.G)/0xff, float64(color.B)/0xff)
}
func (w *Window) Draw(cr *cairo.Context) {
cr.SetSourceRGB(1, 1, 1)
cr.Paint()
w.View.Draw(cr)
}