230 lines
9.0 KiB
Swift
230 lines
9.0 KiB
Swift
//
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// Copyright (c) 2022 Open Whisper Systems. All rights reserved.
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//
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import UIKit
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class ImageEditorTextItem: ImageEditorItem {
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let text: String
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let color: ImageEditorColor
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let font: UIFont
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enum Style: Int {
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case regular = 0
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case inverted
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case underline
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case outline
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}
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let style: Style
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// In order to render the text at a consistent size
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// in very differently sized contexts (canvas in
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// portrait, landscape, in the crop tool, before and
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// after cropping, while rendering output),
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// we need to scale the font size to reflect the
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// view width.
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//
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// We use the image's rendering width as the reference value,
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// since we want to be consistent with regard to the image's
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// content.
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let fontReferenceImageWidth: CGFloat
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let unitCenter: ImageEditorSample
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// Leave some margins against the edge of the image.
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static let kDefaultUnitWidth: CGFloat = 0.9
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// The max width of the text as a fraction of the image width.
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//
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// This provides continuity of text layout before/after cropping.
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//
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// NOTE: When you scale the text with with a pinch gesture, that
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// affects _scaling_, not the _unit width_, since we don't want
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// to change how the text wraps when scaling.
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let unitWidth: CGFloat
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// 0 = no rotation.
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// CGFloat.pi * 0.5 = rotation 90 degrees clockwise.
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let rotationRadians: CGFloat
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static let kMaxScaling: CGFloat = 4.0
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static let kMinScaling: CGFloat = 0.5
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let scaling: CGFloat
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init(text: String,
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color: ImageEditorColor,
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font: UIFont,
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style: Style = .regular,
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fontReferenceImageWidth: CGFloat,
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unitCenter: ImageEditorSample = ImageEditorSample(x: 0.5, y: 0.5),
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unitWidth: CGFloat = ImageEditorTextItem.kDefaultUnitWidth,
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rotationRadians: CGFloat = 0.0,
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scaling: CGFloat = 1.0) {
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self.text = text
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self.color = color
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self.font = font
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self.style = style
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self.fontReferenceImageWidth = fontReferenceImageWidth
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self.unitCenter = unitCenter
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self.unitWidth = unitWidth
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self.rotationRadians = rotationRadians
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self.scaling = scaling
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super.init(itemType: .text)
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}
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private init(itemId: String,
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text: String,
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color: ImageEditorColor,
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font: UIFont,
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style: Style,
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fontReferenceImageWidth: CGFloat,
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unitCenter: ImageEditorSample,
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unitWidth: CGFloat,
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rotationRadians: CGFloat,
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scaling: CGFloat) {
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self.text = text
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self.color = color
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self.font = font
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self.style = style
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self.fontReferenceImageWidth = fontReferenceImageWidth
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self.unitCenter = unitCenter
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self.unitWidth = unitWidth
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self.rotationRadians = rotationRadians
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self.scaling = scaling
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super.init(itemId: itemId, itemType: .text)
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}
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class func empty(withColor color: ImageEditorColor,
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style: Style,
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unitWidth: CGFloat,
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fontReferenceImageWidth: CGFloat,
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scaling: CGFloat,
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rotationRadians: CGFloat) -> ImageEditorTextItem {
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// TODO: Tune the default font size.
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let font = UIFont.boldSystemFont(ofSize: 36)
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return ImageEditorTextItem(text: "",
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color: color,
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font: font,
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style: style,
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fontReferenceImageWidth: fontReferenceImageWidth,
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unitWidth: unitWidth,
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rotationRadians: rotationRadians,
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scaling: scaling)
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}
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func copy(withText newText: String, color newColor: ImageEditorColor) -> ImageEditorTextItem {
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return ImageEditorTextItem(itemId: itemId,
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text: newText,
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color: newColor,
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font: font,
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style: style,
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fontReferenceImageWidth: fontReferenceImageWidth,
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unitCenter: unitCenter,
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unitWidth: unitWidth,
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rotationRadians: rotationRadians,
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scaling: scaling)
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}
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func copy(unitCenter: CGPoint) -> ImageEditorTextItem {
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return ImageEditorTextItem(itemId: itemId,
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text: text,
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color: color,
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font: font,
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style: style,
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fontReferenceImageWidth: fontReferenceImageWidth,
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unitCenter: unitCenter,
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unitWidth: unitWidth,
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rotationRadians: rotationRadians,
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scaling: scaling)
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}
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func copy(scaling: CGFloat, rotationRadians: CGFloat) -> ImageEditorTextItem {
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return ImageEditorTextItem(itemId: itemId,
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text: text,
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color: color,
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font: font,
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style: style,
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fontReferenceImageWidth: fontReferenceImageWidth,
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unitCenter: unitCenter,
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unitWidth: unitWidth,
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rotationRadians: rotationRadians,
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scaling: scaling)
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}
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func copy(unitWidth: CGFloat) -> ImageEditorTextItem {
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return ImageEditorTextItem(itemId: itemId,
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text: text,
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color: color,
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font: font,
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style: style,
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fontReferenceImageWidth: fontReferenceImageWidth,
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unitCenter: unitCenter,
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unitWidth: unitWidth,
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rotationRadians: rotationRadians,
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scaling: scaling)
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}
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func copy(font: UIFont) -> ImageEditorTextItem {
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return ImageEditorTextItem(itemId: itemId,
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text: text,
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color: color,
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font: font,
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style: style,
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fontReferenceImageWidth: fontReferenceImageWidth,
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unitCenter: unitCenter,
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unitWidth: unitWidth,
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rotationRadians: rotationRadians,
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scaling: scaling)
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}
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func copy(color: ImageEditorColor) -> ImageEditorTextItem {
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return ImageEditorTextItem(itemId: itemId,
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text: text,
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color: color,
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font: font,
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style: style,
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fontReferenceImageWidth: fontReferenceImageWidth,
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unitCenter: unitCenter,
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unitWidth: unitWidth,
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rotationRadians: rotationRadians,
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scaling: scaling)
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}
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func copy(style: Style) -> ImageEditorTextItem {
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return ImageEditorTextItem(itemId: itemId,
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text: text,
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color: color,
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font: font,
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style: style,
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fontReferenceImageWidth: fontReferenceImageWidth,
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unitCenter: unitCenter,
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unitWidth: unitWidth,
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rotationRadians: rotationRadians,
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scaling: scaling)
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}
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override func outputScale() -> CGFloat {
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return scaling
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}
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static func == (left: ImageEditorTextItem, right: ImageEditorTextItem) -> Bool {
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return (left.text == right.text &&
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left.color == right.color &&
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left.font.fontName == right.font.fontName &&
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left.style == right.style &&
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left.font.pointSize.fuzzyEquals(right.font.pointSize) &&
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left.fontReferenceImageWidth.fuzzyEquals(right.fontReferenceImageWidth) &&
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left.unitCenter.fuzzyEquals(right.unitCenter) &&
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left.unitWidth.fuzzyEquals(right.unitWidth) &&
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left.rotationRadians.fuzzyEquals(right.rotationRadians) &&
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left.scaling.fuzzyEquals(right.scaling))
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}
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}
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