Path: blob/main/SignalUI/ImageEditor/ImageEditorTextItem.swift
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//
// Copyright 2019 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
//
import UIKit
final class ImageEditorTextItem: ImageEditorItem, ImageEditorTransformable {
let text: String
let color: ColorPickerBarColor
let decorationStyle: MediaTextView.DecorationStyle
let textStyle: MediaTextView.TextStyle
let fontSize: CGFloat
static let defaultFontSize: CGFloat = 36
var font: UIFont {
MediaTextView.font(for: textStyle, withPointSize: fontSize)
}
var textForegroundColor: UIColor {
switch decorationStyle {
case .none, .whiteBackground: return color.color
case .coloredBackground:
let backgroundColor = color.color
return backgroundColor.isCloseToColor(.white) ? .black : .white
case .outline, .underline: return .white
}
}
var textBackgroundColor: UIColor? {
switch decorationStyle {
case .none, .underline, .outline: return nil
case .whiteBackground:
let textColor = color.color
return textColor.isCloseToColor(.white) ? .black : .white
case .coloredBackground: return color.color
}
}
var textDecorationColor: UIColor? {
switch decorationStyle {
case .none, .whiteBackground, .coloredBackground: return nil
case .outline, .underline: return color.color
}
}
// In order to render the text at a consistent size
// in very differently sized contexts (canvas in
// portrait, landscape, in the crop tool, before and
// after cropping, while rendering output),
// we need to scale the font size to reflect the
// view width.
//
// We use the image's rendering width as the reference value,
// since we want to be consistent with regard to the image's
// content.
let fontReferenceImageWidth: CGFloat
let unitCenter: ImageEditorSample
// Leave some margins against the edge of the image.
static let kDefaultUnitWidth: CGFloat = 0.9
// The max width of the text as a fraction of the image width.
//
// This provides continuity of text layout before/after cropping.
//
// NOTE: When you scale the text with with a pinch gesture, that
// affects _scaling_, not the _unit width_, since we don't want
// to change how the text wraps when scaling.
let unitWidth: CGFloat
// 0 = no rotation.
// CGFloat.pi * 0.5 = rotation 90 degrees clockwise.
let rotationRadians: CGFloat
static let kMaxScaling: CGFloat = 4.0
static let kMinScaling: CGFloat = 0.5
let scaling: CGFloat
init(
text: String,
color: ColorPickerBarColor,
fontSize: CGFloat,
textStyle: MediaTextView.TextStyle = .regular,
decorationStyle: MediaTextView.DecorationStyle = .none,
fontReferenceImageWidth: CGFloat,
unitCenter: ImageEditorSample = ImageEditorSample(x: 0.5, y: 0.5),
unitWidth: CGFloat = ImageEditorTextItem.kDefaultUnitWidth,
rotationRadians: CGFloat = 0.0,
scaling: CGFloat = 1.0,
) {
self.text = text
self.color = color
self.fontSize = fontSize
self.textStyle = textStyle
self.decorationStyle = decorationStyle
self.fontReferenceImageWidth = fontReferenceImageWidth
self.unitCenter = unitCenter
self.unitWidth = unitWidth
self.rotationRadians = rotationRadians
self.scaling = scaling
super.init(itemType: .text)
}
init(
itemId: String,
text: String,
color: ColorPickerBarColor,
fontSize: CGFloat,
textStyle: MediaTextView.TextStyle,
decorationStyle: MediaTextView.DecorationStyle,
fontReferenceImageWidth: CGFloat,
unitCenter: ImageEditorSample,
unitWidth: CGFloat,
rotationRadians: CGFloat,
scaling: CGFloat,
) {
self.text = text
self.color = color
self.fontSize = fontSize
self.textStyle = textStyle
self.decorationStyle = decorationStyle
self.fontReferenceImageWidth = fontReferenceImageWidth
self.unitCenter = unitCenter
self.unitWidth = unitWidth
self.rotationRadians = rotationRadians
self.scaling = scaling
super.init(itemId: itemId, itemType: .text)
}
class func empty(
withColor color: ColorPickerBarColor,
textStyle: MediaTextView.TextStyle,
decorationStyle: MediaTextView.DecorationStyle,
unitWidth: CGFloat,
fontReferenceImageWidth: CGFloat,
scaling: CGFloat,
rotationRadians: CGFloat,
) -> ImageEditorTextItem {
return ImageEditorTextItem(
text: "",
color: color,
fontSize: ImageEditorTextItem.defaultFontSize,
textStyle: textStyle,
decorationStyle: decorationStyle,
fontReferenceImageWidth: fontReferenceImageWidth,
unitWidth: unitWidth,
rotationRadians: rotationRadians,
scaling: scaling,
)
}
func copy(withText newText: String, color newColor: ColorPickerBarColor) -> ImageEditorTextItem {
return ImageEditorTextItem(
itemId: itemId,
text: newText,
color: newColor,
fontSize: fontSize,
textStyle: textStyle,
decorationStyle: decorationStyle,
fontReferenceImageWidth: fontReferenceImageWidth,
unitCenter: unitCenter,
unitWidth: unitWidth,
rotationRadians: rotationRadians,
scaling: scaling,
)
}
func copy(unitCenter: CGPoint) -> ImageEditorTextItem {
return ImageEditorTextItem(
itemId: itemId,
text: text,
color: color,
fontSize: fontSize,
textStyle: textStyle,
decorationStyle: decorationStyle,
fontReferenceImageWidth: fontReferenceImageWidth,
unitCenter: unitCenter,
unitWidth: unitWidth,
rotationRadians: rotationRadians,
scaling: scaling,
)
}
func copy(scaling: CGFloat, rotationRadians: CGFloat) -> ImageEditorTextItem {
return ImageEditorTextItem(
itemId: itemId,
text: text,
color: color,
fontSize: fontSize,
textStyle: textStyle,
decorationStyle: decorationStyle,
fontReferenceImageWidth: fontReferenceImageWidth,
unitCenter: unitCenter,
unitWidth: unitWidth,
rotationRadians: rotationRadians,
scaling: scaling,
)
}
func copy(unitWidth: CGFloat) -> ImageEditorTextItem {
return ImageEditorTextItem(
itemId: itemId,
text: text,
color: color,
fontSize: fontSize,
textStyle: textStyle,
decorationStyle: decorationStyle,
fontReferenceImageWidth: fontReferenceImageWidth,
unitCenter: unitCenter,
unitWidth: unitWidth,
rotationRadians: rotationRadians,
scaling: scaling,
)
}
func copy(fontSize: CGFloat) -> ImageEditorTextItem {
return ImageEditorTextItem(
itemId: itemId,
text: text,
color: color,
fontSize: fontSize,
textStyle: textStyle,
decorationStyle: decorationStyle,
fontReferenceImageWidth: fontReferenceImageWidth,
unitCenter: unitCenter,
unitWidth: unitWidth,
rotationRadians: rotationRadians,
scaling: scaling,
)
}
func copy(color: ColorPickerBarColor) -> ImageEditorTextItem {
return ImageEditorTextItem(
itemId: itemId,
text: text,
color: color,
fontSize: fontSize,
textStyle: textStyle,
decorationStyle: decorationStyle,
fontReferenceImageWidth: fontReferenceImageWidth,
unitCenter: unitCenter,
unitWidth: unitWidth,
rotationRadians: rotationRadians,
scaling: scaling,
)
}
func copy(textStyle: MediaTextView.TextStyle, decorationStyle: MediaTextView.DecorationStyle) -> ImageEditorTextItem {
return ImageEditorTextItem(
itemId: itemId,
text: text,
color: color,
fontSize: fontSize,
textStyle: textStyle,
decorationStyle: decorationStyle,
fontReferenceImageWidth: fontReferenceImageWidth,
unitCenter: unitCenter,
unitWidth: unitWidth,
rotationRadians: rotationRadians,
scaling: scaling,
)
}
override func outputScale() -> CGFloat {
return scaling
}
static func ==(left: ImageEditorTextItem, right: ImageEditorTextItem) -> Bool {
return left.text == right.text &&
left.color == right.color &&
left.textStyle == right.textStyle &&
left.decorationStyle == right.decorationStyle &&
left.fontSize.fuzzyEquals(right.fontSize) &&
left.fontReferenceImageWidth.fuzzyEquals(right.fontReferenceImageWidth) &&
left.unitCenter.fuzzyEquals(right.unitCenter) &&
left.unitWidth.fuzzyEquals(right.unitWidth) &&
left.rotationRadians.fuzzyEquals(right.rotationRadians) &&
left.scaling.fuzzyEquals(right.scaling)
}
}