Method command

widget/selectable.go:329–385

(gtx layout.Context, k key.Event)

}

func (e *Selectable) command(gtx layout.Context, k key.Event) {
	direction := 1
	if gtx.Locale.Direction.Progression() == system.TowardOrigin {
		direction = -1
	}
	moveByWord := k.Modifiers.Contain(key.ModShortcutAlt)
	selAct := selectionClear
	if k.Modifiers.Contain(key.ModShift) {
		selAct = selectionExtend
	}
	if k.Modifiers == key.ModShortcut {
		switch k.Name {
		// Copy or Cut selection -- ignored if nothing selected.
		case "C", "X":
			e.scratch = e.text.SelectedText(e.scratch)
			if text := string(e.scratch); text != "" {
				gtx.Execute(clipboard.WriteCmd{Type: "application/text", Data: io.NopCloser(strings.NewReader(text))})
			}
		// Select all
		case "A":
			e.text.SetCaret(0, e.text.Len())
		}
		return
	}
	switch k.Name {
	case key.NameUpArrow:
		e.text.MoveLines(-1, selAct)
	case key.NameDownArrow:
		e.text.MoveLines(+1, selAct)
	case key.NameLeftArrow:
		if moveByWord {
			e.text.MoveWord(-1*direction, selAct)
		} else {
			if selAct == selectionClear {
				e.text.ClearSelection()
			}
			e.text.MoveCaret(-1*direction, -1*direction*int(selAct))
		}
	case key.NameRightArrow:
		if moveByWord {
			e.text.MoveWord(1*direction, selAct)
		} else {
			if selAct == selectionClear {
				e.text.ClearSelection()
			}
			e.text.MoveCaret(1*direction, int(selAct)*direction)
		}
	case key.NamePageUp:
		e.text.MovePages(-1, selAct)
	case key.NamePageDown:
		e.text.MovePages(+1, selAct)
	case key.NameHome:
		e.text.MoveLineStart(selAct)
	case key.NameEnd:
		e.text.MoveLineEnd(selAct)
	}
}