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ichmagmaus111andClaude Opus 5.5
0622057a4f
Ghostgram for iOS, rebuilt from scratch on Telegram iOS 13.0. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
63 lines
2.8 KiB
Swift
63 lines
2.8 KiB
Swift
import Foundation
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import UIKit
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import Display
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import TelegramUIPreferences
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import TelegramPresentationData
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/// The legacy composer's typography and the geometry tuned against it, as pure functions of the chat's
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/// Text Size (Settings ▸ Appearance). One place, so the placeholder, the typed text, the typing attributes,
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/// the empty-field minimum height and the vertical text insets cannot disagree.
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///
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/// History: the panel used to read `fontSize.baseDisplaySize` at fourteen sites, eight of which — inherited
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/// from upstream — carried an always-true `if "".isEmpty { baseFontSize = 17.0 }` pin. The pinned sites were
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/// the placeholder font, the minimum height, the insets and the initial rendering config; the per-keystroke
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/// re-decoration was not pinned. So typed text scaled on the first keystroke while the placeholder stayed at
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/// 17pt, and an empty field opened at the 17pt minimum (31) and animated to the scaled height once the text
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/// node loaded. `ChatTextInputFontMetricsTests` pins the minimum height to what the empty field measures.
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/// The base font size the composer types, decorates and measures with. Floored at `chatTextInputMinFontSize`.
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public func chatTextInputBaseFontSize(for fontSize: PresentationFontSize) -> CGFloat {
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return max(chatTextInputMinFontSize, fontSize.baseDisplaySize)
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}
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/// The empty field's height: one line of the typing font plus the vertical insets, never below the 17pt
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/// value of 31. These are the settled heights the legacy text view measures for the seven steps (14–16pt
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/// measure below 31 and take the floor), so the field does not animate after its text node loads.
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/// Switched on the step, not on a `CGFloat`, so a new step fails to compile here instead of silently
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/// taking 31 and reintroducing the jump.
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public func chatTextInputFieldMinHeight(for fontSize: PresentationFontSize) -> CGFloat {
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switch fontSize {
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case .extraSmall, .small, .medium, .regular:
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return 31.0
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case .large:
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return 33.0
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case .extraLarge:
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return 38.0
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case .extraLargeX2:
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return 42.0
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}
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}
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/// The text container's top/bottom insets for a step (left/right are the caller's: they depend on the
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/// accessory buttons, not on the font). Below 17pt the line box is shorter than the 17pt field, and these
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/// nudge the text toward the field's optical centre.
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public func chatTextInputFieldVerticalInsets(for fontSize: PresentationFontSize) -> UIEdgeInsets {
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let top: CGFloat
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let bottom: CGFloat
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switch fontSize {
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case .extraSmall:
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top = 2.0
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bottom = 1.0
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case .small:
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top = 1.0
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bottom = 1.0
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case .medium:
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top = 0.5
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bottom = 0.0
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case .regular, .large, .extraLarge, .extraLargeX2:
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top = 0.0
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bottom = 0.0
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}
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return UIEdgeInsets(top: 4.5 + top, left: 0.0, bottom: 5.5 + bottom, right: 0.0)
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}
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