Let a pane's tag take a row for each line it holds

A tag that is a text can hold a newline, and the tagline, the body under it
and the pointer all assumed one row. The pane's tag now takes a row per line
(up to eight, and never the body's last row); the body starts below it, the
rows a pointer counts start the body after the tag's lines, a click on any
line puts the tag's cursor there, and a pixel shell gets a tag layer per
line. A tag of one line draws exactly as before.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 11 insertions, 12 deletions

diff --git a/src/pdf_view.zig b/src/pdf_view.zig
index 92a05618..b2fd5866 100644
--- a/src/pdf_view.zig
+++ b/src/pdf_view.zig
@@ -2170,7 +2170,7 @@ pub fn paneViewport(core: *const pardes.Pardes, pane: *const pardes.Pane) ?Viewp
         if (slot == pane) break core.rects[id];
     } else return null;
     const cols = rect.w -| config.GUTTER;
-    const rows = rect.h -| pardes.BOX_H;
+    const rows = rect.h -| pane.tag_rows;
     if (cols == 0 or rows == 0) return null;
     return .{
         .pixel_w = @as(u32, cols) * @as(u32, core.cell_pixels.w),
@@ -2208,8 +2208,8 @@ pub fn pageAtGridRow(core: *const pardes.Pardes, pane: *const pardes.Pane, row:
     const rect = for (core.panes, 0..) |slot, id| {
         if (slot == pane) break core.rects[id];
     } else return null;
-    const body_y = core.bodyTop(rect);
-    if (row < body_y or row >= body_y + (rect.h -| pardes.BOX_H)) return null;
+    const body_y = core.bodyTop(pane, rect);
+    if (row < body_y or row >= body_y + (rect.h -| pane.tag_rows)) return null;
     const local_y = @as(f64, @floatFromInt(
         @as(u32, row - body_y) * core.cell_pixels.h + core.cell_pixels.h / 2,
     ));
@@ -2265,7 +2265,7 @@ pub fn panePointAtPage(
         if (slot == pane) break core.rects[id];
     } else return null;
     const body_x = @as(i64, rect.x + config.GUTTER);
-    const body_y = @as(i64, core.bodyTop(rect));
+    const body_y = @as(i64, core.bodyTop(pane, rect));
     const px = (@as(i64, col) - body_x) * core.cell_pixels.w + core.cell_pixels.w / 2;
     const py = (@as(i64, row) - body_y) * core.cell_pixels.h + core.cell_pixels.h / 2;
     return pointAtPage(state, view, page, px, py, clamp_to_page);
@@ -2549,7 +2549,7 @@ pub fn draw(
     text_width: u16,
 ) bool {
     if (comptime !enabled) return false;
-    if (!core.native_images or rect.h <= pardes.BOX_H) return false;
+    if (!core.native_images or rect.h <= pane.tag_rows) return false;
     const state = &(pane.pdf orelse return false);
     const view = paneViewport(core, pane) orelse return false;
     const key = TintKey{ .mode = state.tint, .colors = tintColors(core) };
@@ -2598,9 +2598,9 @@ pub fn draw(
             .x = text_x,
             // Below the notice chips, like an image: a placed page is
             // drawn after the cells and would paint a chip out.
-            .y = core.bodyTop(rect) + pane.notices.span(),
+            .y = core.bodyTop(pane, rect) + pane.notices.span(),
             .w = text_width,
-            .h = (rect.h -| pardes.BOX_H) -| pane.notices.span(),
+            .h = (rect.h -| pane.tag_rows) -| pane.notices.span(),
             .rgba = placed.rgba,
             .iw = placed.width,
             // The texture contains the retained band, not the full page.
@@ -2616,15 +2616,14 @@ pub fn draw(
 
     // This frame has spent the motion used to choose its raster band.
     state.scroll_travel = 0;
-    const body_y = core.bodyTop(rect);
-    const body_h = rect.h -| pardes.BOX_H;
+    const body_y = core.bodyTop(pane, rect);
+    const body_h = rect.h -| pane.tag_rows;
     const chrome = core.chromeTheme();
     const theme = core.theme();
     const pane_bg: pardes.Color = if (theme.bg) |color| .{ .rgb = color } else .default;
     // The rail runs past the notice bands; only the thumb tracks the text.
-    const rail_y = if (core.settings.tag_bottom) rect.y else rect.y + pardes.BOX_H;
-    core.surface.fill(rect.x, rail_y, 1, rect.h -| pardes.BOX_H, .{ .bg = .{ .rgb = chrome.scroll_track } });
-    core.surface.fill(rect.x + 1, rail_y, 1, rect.h -| pardes.BOX_H, .{ .bg = pane_bg });
+    core.surface.fill(rect.x, body_y, 1, body_h, .{ .bg = .{ .rgb = chrome.scroll_track } });
+    core.surface.fill(rect.x + 1, body_y, 1, body_h, .{ .bg = pane_bg });
 
     const track_h: usize = body_h;
     const total = @max(@as(u64, 1), state.document_height);