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Ahmed5Emad
2cac36a4e2
Hovering a family in the Typography font dropdown previews it on the canvas via text.preview; closing without picking restores the original, clicking applies it as one undo step.
68 lines
2.9 KiB
Rust
68 lines
2.9 KiB
Rust
//! Live text previews: what a text command would do, shown on the canvas without an undo step —
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//! while the pointer is over a font family or style, a text style in the style browser or a
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//! font's named instance, or while a variable font axis slider is dragged. The document under the preview is kept and comes
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//! back when the preview ends ([`end`], `text.endPreview`). Every other command ends it first, so
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//! committing (running the command for real) applies to the document itself as one undo step, and
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//! Escape just ends the preview.
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use std::sync::Arc;
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use serde_json::Value;
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use crate::{EngineError, Result, Session, bad, find_command, guard, normalize};
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/// The commands that show or end a preview (they don't end the one showing).
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pub const COMMANDS: [&str; 2] = ["text.preview", "text.endPreview"];
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/// What can be previewed: text styles, font styles and axis values.
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pub const PREVIEWABLE: [&str; 4] = ["style.apply", "library.applyStyle", "text.setVariations", "text.style"];
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/// Show `command params` as a live preview (in place of an earlier one).
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pub fn show(s: &mut Session, command: &str, params: &Value) -> Result<()> {
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let cmd = "text.preview";
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if !PREVIEWABLE.contains(&command) {
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return Err(bad(cmd, format!("`{command}` can't be previewed (one of: {})", PREVIEWABLE.join(", "))));
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}
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let spec = find_command(command).ok_or_else(|| EngineError::UnknownCommand(command.to_string()))?;
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end(s);
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let ds = s.ds()?;
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if ds.preview.is_some() {
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return Err(EngineError::Disabled(cmd.into(), crate::PREVIEW_READ_ONLY.into()));
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}
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let (base, selection, text_edit, page, uid) = (ds.doc.clone(), ds.selection.clone(), ds.text_edit.clone(), ds.page, ds.uid);
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let result = guard::run(command, || (spec.run)(s, params))
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// Library copies and instance structure stay as they are, in previews too.
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.and_then(|v| s.check_instance_structure(command, &Some((base.clone(), selection.clone(), page, uid))).map(|()| v));
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let ds = s.ds_mut()?;
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// A preview changes what's shown, never the selection or the text being edited.
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ds.selection = selection;
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ds.text_edit = text_edit;
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match result {
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Ok(_) if !Arc::ptr_eq(&ds.doc, &base) => {
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normalize(ds.doc_mut(), &base);
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ds.text_preview = Some(base);
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ds.revision += 1;
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Ok(())
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}
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Ok(_) => Ok(()),
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Err(e) => {
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ds.doc = base;
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Err(e)
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}
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}
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}
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/// End the live preview, if any: the document is back as it was. Returns whether one was showing.
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pub fn end(s: &mut Session) -> bool {
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let Ok(ds) = s.ds_mut() else { return false };
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let Some(base) = ds.text_preview.take() else { return false };
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ds.doc = base;
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ds.revision += 1;
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true
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}
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/// Whether a live text preview is showing.
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pub fn active(s: &Session) -> bool {
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s.ds().is_ok_and(|d| d.text_preview.is_some())
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}
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