zoom.go RawHistoryFolder

1package entity
2
3import (
4	"math"
5	"time"
6)
7
8// ZoomLevel represents the zoom factor for a specific domain.
9// Allows users to set persistent zoom levels per-site.
10type ZoomLevel struct {
11	Domain     string  // Domain name (e.g., "github.com")
12	ZoomFactor float64 // Zoom factor (1.0 = 100%, 1.5 = 150%)
13	UpdatedAt  time.Time
14}
15
16// Default zoom constants
17const (
18	ZoomDefault = 1.0
19	ZoomMin     = 0.25 // 25%
20	ZoomMax     = 5.0  // 500%
21	ZoomStep    = 0.1  // 10% increments
22)
23
24// NewZoomLevel creates a new zoom level for a domain.
25func NewZoomLevel(domain string, factor float64) *ZoomLevel {
26	return &ZoomLevel{
27		Domain:     domain,
28		ZoomFactor: clampZoom(factor),
29		UpdatedAt:  time.Now(),
30	}
31}
32
33// SetFactor updates the zoom factor, clamping to valid range.
34func (z *ZoomLevel) SetFactor(factor float64) {
35	z.ZoomFactor = clampZoom(factor)
36	z.UpdatedAt = time.Now()
37}
38
39// ZoomIn increases the zoom factor by one step.
40func (z *ZoomLevel) ZoomIn() {
41	z.SetFactor(z.ZoomFactor + ZoomStep)
42}
43
44// ZoomOut decreases the zoom factor by one step.
45func (z *ZoomLevel) ZoomOut() {
46	z.SetFactor(z.ZoomFactor - ZoomStep)
47}
48
49// Reset restores the zoom factor to default.
50func (z *ZoomLevel) Reset() {
51	z.SetFactor(ZoomDefault)
52}
53
54// IsDefault returns true if the zoom is at default level.
55func (z *ZoomLevel) IsDefault() bool {
56	return z.ZoomFactor == ZoomDefault
57}
58
59// ZoomPercentage returns a zoom factor as a whole percentage (e.g., 150 for
60// 1.5). Accumulated floating-point error is rounded away so a factor that equals
61// the default zoom in intent (0.9999999999999997) displays as 100, not 99.
62func ZoomPercentage(factor float64) int {
63	return int(math.Round(factor * 100))
64}
65
66// Percentage returns the zoom factor as a whole percentage.
67func (z *ZoomLevel) Percentage() int {
68	return ZoomPercentage(z.ZoomFactor)
69}
70
71// clampZoom constrains a zoom factor to the valid range.
72func clampZoom(factor float64) float64 {
73	if factor < ZoomMin {
74		return ZoomMin
75	}
76	if factor > ZoomMax {
77		return ZoomMax
78	}
79	return factor
80}