39 lines
1021 B
Go
39 lines
1021 B
Go
package autoscroll
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import "github.com/gotk3/gotk3/gtk"
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type ScrolledWindow struct {
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gtk.ScrolledWindow
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vadj gtk.Adjustment
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Bottomed bool // :floshed:
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}
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func NewScrolledWindow() *ScrolledWindow {
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gtksw, _ := gtk.ScrolledWindowNew(nil, nil)
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gtksw.SetProperty("propagate-natural-height", true)
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gtksw.SetProperty("window-placement", gtk.CORNER_BOTTOM_LEFT)
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sw := &ScrolledWindow{*gtksw, *gtksw.GetVAdjustment(), true} // bottomed by default
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sw.Connect("size-allocate", func(_ *gtk.ScrolledWindow) {
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// We can't really trust Gtk to be competent.
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if sw.Bottomed {
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sw.ScrollToBottom()
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}
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})
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sw.vadj.Connect("value-changed", func(adj *gtk.Adjustment) {
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// Manually check if we're anchored on scroll.
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sw.Bottomed = (adj.GetUpper() - adj.GetPageSize()) <= adj.GetValue()
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})
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return sw
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}
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// GetVAdjustment overrides gtk.ScrolledWindow's.
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func (s *ScrolledWindow) GetVAdjustment() *gtk.Adjustment {
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return &s.vadj
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}
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func (s *ScrolledWindow) ScrollToBottom() {
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s.vadj.SetValue(s.vadj.GetUpper())
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}
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