Golang util.Constrain函数代码示例

func calculateSize(base int, size sizeSpec, margin int, minSize int) int {
	max := base - margin
	if size.percent {
		return util.Constrain(int(float64(base)*0.01*size.size), minSize, max)
	}
	return util.Constrain(int(size.size), minSize, max)
}

func (t *Terminal) constrain() {
	count := t.merger.Length()
	height := t.maxItems()
	diffpos := t.cy - t.offset

	t.cy = util.Constrain(t.cy, 0, count-1)
	t.offset = util.Constrain(t.offset, t.cy-height+1, t.cy)
	// Adjustment
	if count-t.offset < height {
		t.offset = util.Max(0, count-height)
		t.cy = util.Constrain(t.offset+diffpos, 0, count-1)
	}
	t.offset = util.Max(0, t.offset)
}

func (t *Terminal) constrain() {
	count := t.merger.Length()
	height := C.MaxY() - 2
	diffpos := t.cy - t.offset

	t.cy = util.Constrain(t.cy, 0, count-1)

	if t.cy > t.offset+(height-1) {
		// Ceil
		t.offset = t.cy - (height - 1)
	} else if t.offset > t.cy {
		// Floor
		t.offset = t.cy
	}

	// Adjustment
	if count-t.offset < height {
		t.offset = util.Max(0, count-height)
		t.cy = util.Constrain(t.offset+diffpos, 0, count-1)
	}
}

//.........这里部分代码省略.........
				t.cx = findLastMatch("[^[:alnum:]][[:alnum:]]", string(t.input[:t.cx])) + 1
			case actForwardWord:
				t.cx += findFirstMatch("[[:alnum:]][^[:alnum:]]|(.$)", string(t.input[t.cx:])) + 1
			case actKillWord:
				ncx := t.cx +
					findFirstMatch("[[:alnum:]][^[:alnum:]]|(.$)", string(t.input[t.cx:])) + 1
				if ncx > t.cx {
					t.yanked = copySlice(t.input[t.cx:ncx])
					t.input = append(t.input[:t.cx], t.input[ncx:]...)
				}
			case actKillLine:
				if t.cx < len(t.input) {
					t.yanked = copySlice(t.input[t.cx:])
					t.input = t.input[:t.cx]
				}
			case actRune:
				prefix := copySlice(t.input[:t.cx])
				t.input = append(append(prefix, event.Char), t.input[t.cx:]...)
				t.cx++
			case actPreviousHistory:
				if t.history != nil {
					t.history.override(string(t.input))
					t.input = []rune(t.history.previous())
					t.cx = len(t.input)
				}
			case actNextHistory:
				if t.history != nil {
					t.history.override(string(t.input))
					t.input = []rune(t.history.next())
					t.cx = len(t.input)
				}
			case actMouse:
				me := event.MouseEvent
				mx, my := me.X, me.Y
				if me.S != 0 {
					// Scroll
					if t.merger.Length() > 0 {
						if t.multi && me.Mod {
							toggle()
						}
						t.vmove(me.S)
						req(reqList)
					}
				} else if mx >= t.marginInt[3] && mx < C.MaxX()-t.marginInt[1] &&
					my >= t.marginInt[0] && my < C.MaxY()-t.marginInt[2] {
					mx -= t.marginInt[3]
					my -= t.marginInt[0]
					mx = util.Constrain(mx-len(t.prompt), 0, len(t.input))
					if !t.reverse {
						my = t.maxHeight() - my - 1
					}
					min := 2 + len(t.header)
					if t.inlineInfo {
						min--
					}
					if me.Double {
						// Double-click
						if my >= min {
							if t.vset(t.offset+my-min) && t.cy < t.merger.Length() {
								return doAction(t.keymap[C.DoubleClick], C.DoubleClick)
							}
						}
					} else if me.Down {
						if my == 0 && mx >= 0 {
							// Prompt
							t.cx = mx
						} else if my >= min {
							// List
							if t.vset(t.offset+my-min) && t.multi && me.Mod {
								toggle()
							}
							req(reqList)
						}
					}
				}
			}
			return true
		}
		action := t.keymap[event.Type]
		mapkey := event.Type
		if event.Type == C.Rune {
			mapkey = int(event.Char) + int(C.AltZ)
			if act, prs := t.keymap[mapkey]; prs {
				action = act
			}
		}
		if !doAction(action, mapkey) {
			continue
		}
		changed := string(previousInput) != string(t.input)
		t.mutex.Unlock() // Must be unlocked before touching reqBox

		if changed {
			t.eventBox.Set(EvtSearchNew, t.sort)
		}
		for _, event := range events {
			t.reqBox.Set(event, nil)
		}
	}
}

func (t *Terminal) vset(o int) bool {
	t.cy = util.Constrain(o, 0, t.merger.Length()-1)
	return t.cy == o
}

func (t *Terminal) printHighlighted(result *Result, attr tui.Attr, col1 tui.ColorPair, col2 tui.ColorPair, current bool) {
	item := result.item

	// Overflow
	text := make([]rune, item.text.Length())
	copy(text, item.text.ToRunes())
	matchOffsets := []Offset{}
	var pos *[]int
	if t.merger.pattern != nil {
		_, matchOffsets, pos = t.merger.pattern.MatchItem(item, true, t.slab)
	}
	charOffsets := matchOffsets
	if pos != nil {
		charOffsets = make([]Offset, len(*pos))
		for idx, p := range *pos {
			offset := Offset{int32(p), int32(p + 1)}
			charOffsets[idx] = offset
		}
		sort.Sort(ByOrder(charOffsets))
	}
	var maxe int
	for _, offset := range charOffsets {
		maxe = util.Max(maxe, int(offset[1]))
	}

	offsets := result.colorOffsets(charOffsets, t.theme, col2, attr, current)
	maxWidth := t.window.Width - 3
	maxe = util.Constrain(maxe+util.Min(maxWidth/2-2, t.hscrollOff), 0, len(text))
	if overflow(text, maxWidth) {
		if t.hscroll {
			// Stri..
			if !overflow(text[:maxe], maxWidth-2) {
				text, _ = trimRight(text, maxWidth-2)
				text = append(text, []rune("..")...)
			} else {
				// Stri..
				if overflow(text[maxe:], 2) {
					text = append(text[:maxe], []rune("..")...)
				}
				// ..ri..
				var diff int32
				text, diff = trimLeft(text, maxWidth-2)

				// Transform offsets
				for idx, offset := range offsets {
					b, e := offset.offset[0], offset.offset[1]
					b += 2 - diff
					e += 2 - diff
					b = util.Max32(b, 2)
					offsets[idx].offset[0] = b
					offsets[idx].offset[1] = util.Max32(b, e)
				}
				text = append([]rune(".."), text...)
			}
		} else {
			text, _ = trimRight(text, maxWidth-2)
			text = append(text, []rune("..")...)

			for idx, offset := range offsets {
				offsets[idx].offset[0] = util.Min32(offset.offset[0], int32(maxWidth-2))
				offsets[idx].offset[1] = util.Min32(offset.offset[1], int32(maxWidth))
			}
		}
	}

	var index int32
	var substr string
	var prefixWidth int
	maxOffset := int32(len(text))
	for _, offset := range offsets {
		b := util.Constrain32(offset.offset[0], index, maxOffset)
		e := util.Constrain32(offset.offset[1], index, maxOffset)

		substr, prefixWidth = processTabs(text[index:b], prefixWidth)
		t.window.CPrint(col1, attr, substr)

		if b < e {
			substr, prefixWidth = processTabs(text[b:e], prefixWidth)
			t.window.CPrint(offset.color, offset.attr, substr)
		}

		index = e
		if index >= maxOffset {
			break
		}
	}
	if index < maxOffset {
		substr, _ = processTabs(text[index:], prefixWidth)
		t.window.CPrint(col1, attr, substr)
	}
}

//.........这里部分代码省略.........
		event := tui.GetChar()

		t.mutex.Lock()
		previousInput := t.input
		events := []util.EventType{reqPrompt}
		req := func(evts ...util.EventType) {
			for _, event := range evts {
				events = append(events, event)
				if event == reqClose || event == reqQuit {
					looping = false
				}
			}
		}
		selectItem := func(item *Item) bool {
			if _, found := t.selected[item.Index()]; !found {
				t.selected[item.Index()] = selectedItem{time.Now(), item}
				return true
			}
			return false
		}
		toggleY := func(y int) {
			item := t.merger.Get(y).item
			if !selectItem(item) {
				delete(t.selected, item.Index())
			}
		}
		toggle := func() {
			if t.cy < t.merger.Length() {
				toggleY(t.cy)
				req(reqInfo)
			}
		}
		scrollPreview := func(amount int) {
			t.previewer.offset = util.Constrain(
				t.previewer.offset+amount, 0, t.previewer.lines-1)
			req(reqPreviewRefresh)
		}
		for key, ret := range t.expect {
			if keyMatch(key, event) {
				t.pressed = ret
				t.reqBox.Set(reqClose, nil)
				t.mutex.Unlock()
				return
			}
		}

		var doAction func(actionType, int) bool
		doAction = func(action actionType, mapkey int) bool {
			switch action {
			case actIgnore:
			case actExecute:
				if t.cy >= 0 && t.cy < t.merger.Length() {
					t.executeCommand(t.execmap[mapkey], []*Item{t.currentItem()})
				}
			case actExecuteMulti:
				if len(t.selected) > 0 {
					sels := make([]*Item, len(t.selected))
					for i, sel := range t.sortSelected() {
						sels[i] = sel.item
					}
					t.executeCommand(t.execmap[mapkey], sels)
				} else {
					return doAction(actExecute, mapkey)
				}
			case actInvalid:
				t.mutex.Unlock()

//.........这里部分代码省略.........
				t.vmove(1)
				req(reqList)
			}
		case C.CtrlJ, C.CtrlN:
			t.vmove(-1)
			req(reqList)
		case C.CtrlK, C.CtrlP:
			t.vmove(1)
			req(reqList)
		case C.CtrlM:
			req(reqClose)
		case C.CtrlL:
			req(reqRedraw)
		case C.CtrlU:
			if t.cx > 0 {
				t.yanked = copySlice(t.input[:t.cx])
				t.input = t.input[t.cx:]
				t.cx = 0
			}
		case C.CtrlW:
			if t.cx > 0 {
				t.rubout("\\s\\S")
			}
		case C.AltBS:
			if t.cx > 0 {
				t.rubout("[^[:alnum:]][[:alnum:]]")
			}
		case C.CtrlY:
			suffix := copySlice(t.input[t.cx:])
			t.input = append(append(t.input[:t.cx], t.yanked...), suffix...)
			t.cx += len(t.yanked)
		case C.Del:
			t.delChar()
		case C.PgUp:
			t.vmove(maxItems() - 1)
			req(reqList)
		case C.PgDn:
			t.vmove(-(maxItems() - 1))
			req(reqList)
		case C.AltB:
			t.cx = findLastMatch("[^[:alnum:]][[:alnum:]]", string(t.input[:t.cx])) + 1
		case C.AltF:
			t.cx += findFirstMatch("[[:alnum:]][^[:alnum:]]|(.$)", string(t.input[t.cx:])) + 1
		case C.AltD:
			ncx := t.cx +
				findFirstMatch("[[:alnum:]][^[:alnum:]]|(.$)", string(t.input[t.cx:])) + 1
			if ncx > t.cx {
				t.yanked = copySlice(t.input[t.cx:ncx])
				t.input = append(t.input[:t.cx], t.input[ncx:]...)
			}
		case C.Rune:
			prefix := copySlice(t.input[:t.cx])
			t.input = append(append(prefix, event.Char), t.input[t.cx:]...)
			t.cx++
		case C.Mouse:
			me := event.MouseEvent
			mx, my := util.Constrain(me.X-len(t.prompt), 0, len(t.input)), me.Y
			if !t.reverse {
				my = C.MaxY() - my - 1
			}
			if me.S != 0 {
				// Scroll
				if t.merger.Length() > 0 {
					if t.multi && me.Mod {
						toggle()
					}
					t.vmove(me.S)
					req(reqList)
				}
			} else if me.Double {
				// Double-click
				if my >= 2 {
					if t.vset(my-2) && t.cy < t.merger.Length() {
						req(reqClose)
					}
				}
			} else if me.Down {
				if my == 0 && mx >= 0 {
					// Prompt
					t.cx = mx
				} else if my >= 2 {
					// List
					if t.vset(t.offset+my-2) && t.multi && me.Mod {
						toggle()
					}
					req(reqList)
				}
			}
		}
		changed := string(previousInput) != string(t.input)
		t.mutex.Unlock() // Must be unlocked before touching reqBox

		if changed {
			t.eventBox.Set(EvtSearchNew, nil)
		}
		for _, event := range events {
			t.reqBox.Set(event, nil)
		}
	}
}

func (t *Terminal) printHighlighted(item *Item, bold bool, col1 int, col2 int, current bool) {
	var maxe int
	for _, offset := range item.offsets {
		maxe = util.Max(maxe, int(offset[1]))
	}

	// Overflow
	text := make([]rune, len(item.text))
	copy(text, item.text)
	offsets := item.colorOffsets(col2, bold, current)
	maxWidth := C.MaxX() - 3 - t.marginInt[1] - t.marginInt[3]
	maxe = util.Constrain(maxe+util.Min(maxWidth/2-2, t.hscrollOff), 0, len(text))
	fullWidth := displayWidth(text)
	if fullWidth > maxWidth {
		if t.hscroll {
			// Stri..
			matchEndWidth := displayWidth(text[:maxe])
			if matchEndWidth <= maxWidth-2 {
				text, _ = trimRight(text, maxWidth-2)
				text = append(text, []rune("..")...)
			} else {
				// Stri..
				if matchEndWidth < fullWidth-2 {
					text = append(text[:maxe], []rune("..")...)
				}
				// ..ri..
				var diff int32
				text, diff = trimLeft(text, maxWidth-2)

				// Transform offsets
				for idx, offset := range offsets {
					b, e := offset.offset[0], offset.offset[1]
					b += 2 - diff
					e += 2 - diff
					b = util.Max32(b, 2)
					offsets[idx].offset[0] = b
					offsets[idx].offset[1] = util.Max32(b, e)
				}
				text = append([]rune(".."), text...)
			}
		} else {
			text, _ = trimRight(text, maxWidth-2)
			text = append(text, []rune("..")...)

			for idx, offset := range offsets {
				offsets[idx].offset[0] = util.Min32(offset.offset[0], int32(maxWidth-2))
				offsets[idx].offset[1] = util.Min32(offset.offset[1], int32(maxWidth))
			}
		}
	}

	var index int32
	var substr string
	var prefixWidth int
	maxOffset := int32(len(text))
	for _, offset := range offsets {
		b := util.Constrain32(offset.offset[0], index, maxOffset)
		e := util.Constrain32(offset.offset[1], index, maxOffset)

		substr, prefixWidth = processTabs(text[index:b], prefixWidth)
		C.CPrint(col1, bold, substr)

		if b < e {
			substr, prefixWidth = processTabs(text[b:e], prefixWidth)
			C.CPrint(offset.color, offset.bold, substr)
		}

		index = e
		if index >= maxOffset {
			break
		}
	}
	if index < maxOffset {
		substr, _ = processTabs(text[index:], prefixWidth)
		C.CPrint(col1, bold, substr)
	}
}