aionggFilmCraft interface
The egui frontend draws panels and dialogs, and dispatches project changes through the engine. Interactive controls keep stable automation ids regardless of the interface language.
Export range warnings
The Export panel shows the selected range's length in sequence frames and seconds beside Range
(export.range.duration). When Source In/Out covers just one sequence frame and at least one
mark is set, export.range.warning explains how to export the whole sequence instead (#3364).
The warning is advisory: exporting one frame remains valid. Entire Source, Work Area and Custom
ranges do not show this warning. export_ui::single_frame_in_out_warning_updates_with_range_and_marks
checks the warning and duration as marks and range selections change; the same test can render
export-single-frame-warning.png with FILMCRAFT_UI_SNAPSHOT_DIR.
Control input limits
The control channel bounds ui.click to 10 clicks and ui.drag to 1024 movement steps (#2784).
The MCP bridge sends null for omitted counts/steps, so the validator treats null like an absent
field: one click or 12 drag steps. Negative, fractional, non-numeric and over-limit values still
return errors before queuing any input. Zero clicks emit no button events; 0–1 drag steps use 2.
control::input_bounds_tests covers defaults, rejection, unchanged pending input and valid
gestures; keyboard_ui verifies that rejected requests leave the UI usable. See the
control protocol.
Transition drop previews
Dragging a video or audio transition over a compatible clip shows its actual time span, the
selected cut and an In/Out label. Shared cuts center the span; isolated edges use a one-sided
span. The preview uses the engine's read-only transition planner, including Timeline duration
preferences, and release dispatches effects.apply with the same edge. Locked tracks and
incompatible clip types show no valid transition preview. Ordinary effects retain their clip
outline. timeline.transitionDropPreview exposes the span and edge to automation.
transition_drop_ui covers both edges of short video/audio clips, hover without project edits,
the committed span and undo. Set FILMCRAFT_UI_SNAPSHOT_DIR to render screenshots with wgpu.
Localisation
Edit > Language offers English, Japanese, Spanish, Brazilian Portuguese, Ukrainian, Simplified
Chinese, German, Russian, French, Indonesian, Korean, Italian, Czech, Polish, Swedish and Turkish (all but Ukrainian cover
the whole interface; Ukrainian covers the core menus). The language is stored in the engine's general.interfaceLanguage preference,
restored on startup, and also available in Settings > General.
Its default, System Language (system), follows the operating system: the first of the user's
preferred languages that the interface has (the host supplies them through
HostHooks::system_languages: sys-locale on the desktop, navigator.languages on the web),
otherwise English.
The app.language.* UI commands and prefs.set reach it through the control channel.
Japanese requires a craft-fonts build or a suitable installed font.
English source strings are lookup keys in src/i18n/<code>.tsv. tl! translates literals, tlf!
fills translated templates, and i18n::t translates names from registries. Placeholder values
(including user filenames containing braces) are inserted literally. Catalog translations are
original work using ordinary language, without proprietary localisation resources.
Spanish, Japanese, Simplified Chinese, French, Brazilian Portuguese, German and Russian cover menus, panels, dialogs, settings and registry labels. Searches accept both the translated label and its English source, including Unicode capitals. Project content, command ids and preference values retain their original values. Engine errors, CLI and MCP messages remain English. Ukrainian currently covers the core menus; it falls back to English elsewhere.
A string a catalog lacks shows in English, so a missing translation never fails a test or a
build. cargo xtask i18n-report prints each language's missing strings (menus, tl! literals and
registry names) and its entries whose source the interface no longer has; cargo xtask ci prints
the same report in its log.
Verification: cargo test -p filmcraft-ui-egui checks catalog syntax, duplicate keys, placeholders
and UI behaviour in other languages (switching, search, font coverage); cargo xtask ci runs the
workspace gates. Visual checks use the control channel to switch language and capture the resulting
panels.
Source playback
source_playback.rs auditions media independently of Program playback. It reuses MediaSource
decoding, output mapping, the device clock and the desktop play-ahead buffer. Only one monitor
owns the device at a time. Source frame jobs use the existing frame server and Source resolution.
The live project, undo stack and timeline playhead are unchanged. See monitor documentation
for behavior, commands, limitations and regression tests. Source playback tests use synthetic
demo media and fake audio outputs; no third-party assets are introduced.
Source drag controls snapshot the selected span and dispatch timeline.place for video, audio,
or linked video/audio. Full-clip marks are implicit until set by the user. The engine owns edits,
range validation and undo; the UI owns the drag gesture. See source_drag_ui and the engine's
source_placement_tests for regression coverage.
Source range handles use transient gesture previews and the engine's integer-frame
source_monitor::adjust_range; release dispatches one mark edit. Monitor command routing
keeps Source navigation, markers and marked-range playback separate from Program.
Pane layout controls
The panels use craft-ui::docking with its split-tree settings: craft-ui draws the frames, tab
strips, floating windows and drag previews and owns the gestures; dock_ui.rs draws the panel
bodies, the ≡ panel menu and the Timeline's sequence tabs. Bounded split geometry and
keyboard-accessible resize handles use craft-ui::layout. Panel tabs or their group's drag bar
move between tab groups, split at a group's or the window's edge, reorder, or float when released
with Cmd/Ctrl; a release over no target cancels. Tools and the Audio Meters keep their widths
as the window resizes (fixed split sizes, which a divider drag keeps fixed); the other groups
resize with the window. Every group resizes down to the same minimum and has no maximum.
Timeline sequence tabs retain their sequence-opening, closing and horizontal reorder behavior.
On desktop each floating panel opens in its own OS window. Tool panels are palettes: they stay
above other windows and hide while another application is active. The video viewers (Program,
Source, Reference Monitor, Lumetri Scopes) are normal windows, say on a second display: they
stack with the main window and stay shown in the background. A floating window moves by its
title bar, resizes from every edge and splits like the main window. While a modal dialog is open
(Settings, Recovery, Revert, a file dialog), the native windows are dimmed and take no input.
The main window's input rewrite (macOS Control+Click as a secondary click,
--control-input-only) also runs in each native window, and files dropped on one are imported
like files dropped on the main window; on the Timeline they land at the drop point. A drag from
a panel (a clip from the Source Monitor or the Project panel, an effect, a template) drops on a
panel in any of the app's windows. On Wayland
floating windows stay inside the main window. Where egui embeds viewports (tests), floating
windows stay inside the main window too.
Named workspaces save the layout, floating windows included; workspaces saved in the earlier layout format still load. While every floating window is one tab group, a save also writes the earlier format, so earlier versions still open the workspace. Automation IDs and workspace commands remain the integration boundary.
Tools and dock tabs expose their actual egui widget IDs, paint keyboard focus, and support
Tab/Shift-Tab traversal and Space/Enter activation. Control-injected keys can reach focused
widgets in a background window. The optional --control-input-only native launch mode isolates
automation from native widget/menu input; ui.inspect reports native and effective focus
separately. Focus and input-ownership regressions cover document/playhead preservation.
Compact monitor layouts separate the current and duration timecodes from zoom, resolution and
settings. Source video/audio drag choices retain their existing placement behavior. Transport
buttons use craft-ui::layout::fit_toolbar; commands beyond the available width remain available
through More, including their selected state and Source/Program routing. A scrolling fallback
retains all commands if even More cannot fit. monitor_geometry checks the painted readouts,
control bounds, overflow actions and Source drag payloads across monitor widths and themes.
Editable clip duration
The Clip Speed / Duration dialog lets you type a duration as timecode. Duration and
Speed describe the same source span: editing either updates the other. Duration uses
the sequence frame rate; invalid, zero, or out-of-range durations cannot be applied.
The field is available to automation as speedDuration.duration. OK uses the existing
speed command, including its linked-clip, ripple, neighbour, and Undo behaviour;
Cancel discards the draft. The selected clip's duration is the reference when more
than one clip is selected, matching the existing Speed control.
clip_dialogs_ui::duration_text_edits_speed_and_rejects_invalid_input exercises real
text input, validation, application, Cancel, and Undo/Redo.