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Diffstat (limited to 'src/cardlayout.h')
| -rw-r--r-- | src/cardlayout.h | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/src/cardlayout.h b/src/cardlayout.h new file mode 100644 index 0000000..ef6a563 --- /dev/null +++ b/src/cardlayout.h @@ -0,0 +1,150 @@ +/* + * qtmaildir - a Qt6 mail client for notmuch-indexed Maildirs + * Copyright (C) 2026 Danilo M. <danix@danix.xyz> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#pragma once + +#include <QDateTime> +#include <QFont> +#include <QRect> +#include <QVector> + +/// Where everything on a card goes, with no painting and no widget. +/// +/// Split out from CardDelegate on purpose. A delegate needs a live QPainter and +/// an exposed view before it draws anything, which is what makes delegate tests +/// fragile: CLAUDE.md records that viewport()->render() returns a blank image in +/// several ordinary situations, and that a probe reporting "no ink anywhere" is +/// far more likely broken than the code it is testing. Every geometric claim +/// about a card is therefore made here, where a test is a function call. +/// +/// The card is three lines, always: +/// +/// sender ................................ date <- senderRect/dateRect +/// * subject @ v 3 replies <- subjectRect/expanderRect +/// [tag] [tag] <- tagRect +struct CardLayout +{ + /// What the model says about the row. Deliberately plain data: the layout + /// must be computable in a test without a model or a view. + struct Input + { + bool isMessage = false; + int depth = 0; ///< 0 for a thread root, 1 for a direct reply. + int replyCount = 0; ///< 0 means no expander. + }; + + /// Width of the account accent bar down a thread card's left edge. + /// + /// A starting value, not a settled one. Five accounts is enough that two + /// colours distinct as chips can read alike as thin stripes, and that can + /// only be judged against real cards on the user's own screen and theme + /// (Task 10). Widen it there if the accounts are not tellable apart. + static constexpr int kAccentWidth = 3; + + /// Horizontal breathing room at the card's edges, measured from the accent + /// bar rather than from the card, so text does not sit on the colour. + static constexpr int kPaddingX = 8; + + /// Vertical breathing room above the first line and below the last. + static constexpr int kPaddingY = 4; + + /// How far one level of reply nesting indents. + static constexpr int kIndentStep = 18; + + /// The depth past which nothing indents further. + /// + /// A mailing-list chain can nest a dozen deep, and without a cap the + /// sender is eventually pushed off the right edge. Item 20 accepted that + /// deep chains must be capped in the VIEW rather than flattened in the + /// model, and this is that cap. Rows past it draw at this depth's indent + /// with no marker saying so. + static constexpr int kMaxDepth = 4; + + QRect senderRect; + QRect dateRect; + QRect subjectRect; + QRect tagRect; + + /// The reply count's rect, and the click target that toggles the thread. + /// Empty when the row has no replies. + QRect expanderRect; + + /// The account accent bar down the card's left edge. + /// + /// Thread cards only. A reply's account is its thread's, stated once at the + /// head of the conversation, and a second vertical line in a reply's gutter + /// would sit a few pixels from the spine and compete with it. The spine + /// carries the accent instead, so an expansion is bounded by one colour + /// without ever drawing two lines. Empty on a reply. + QRect accentRect; + + /// One full-height vertical line per depth level, outermost first. + QVector<QRect> spines; + + /// Where the card's text starts, after any indent. + int contentLeft = 0; + + int totalHeight = 0; + + /// The height EVERY row gets, thread and reply alike. + /// + /// Uniform by design: it keeps setUniformRowHeights(true), which is the + /// single cheapest property of this layout, since no scrolling or + /// hit-testing arithmetic has to account for rows of differing size. The + /// cost is a blank third line on a card with no tags, which was accepted + /// explicitly. + static int heightFor(const QFont &font); + + /// The font the tag chips and the reply count are drawn in: a size down + /// from the card's own, so they read as annotation rather than as a third + /// column of content. + static QFont smallFont(const QFont &cardFont); + + static CardLayout compute(const Input &input, const QRect &rect, + const QFont &font); + + /// How a card writes a date, in the user's own locale. + /// + /// Never a hardcoded pattern. "yyyy-MM-dd hh:mm" is a US-looking format + /// that an Italian desktop does not use, and the whole point of asking the + /// system locale is that the user reads dates the way their desktop writes + /// them everywhere else. + /// + /// Shared with the layout so the width reserved for the date and the text + /// drawn into it come from one place: a locale whose short format is + /// longer than the reserved rect would clip, which is exactly the fault + /// bold text produced. + static QString formatDate(const QDateTime &date); + + /// The widest string formatDate() can return, for reserving space. + static QString widestDateSample(); + + /// The expander's label: the reply count with its glyph, as drawn. + /// + /// Shared with the layout for the same reason as formatDate: the rect + /// reserved for the pill and the text put inside it must come from one + /// place, or a count wider than the sample the layout guessed at spills + /// out of its own background. + /// + /// `expanded` chooses which way the triangle points. + static QString expanderLabel(int replyCount, bool expanded); + + /// Padding inside the expander pill, matching a tag chip's, so the two read + /// as the same kind of object on the card. + static constexpr int kPillPaddingX = 8; +}; |