a builtin to put the pane taglines at the bottom

1 files changed, 13 insertions, 6 deletions

diff --git a/src/web.zig b/src/web.zig
index 42359329..b8abf27e 100644
--- a/src/web.zig
+++ b/src/web.zig
@@ -489,13 +489,19 @@ fn putU32(s: *State, value: u32) void {
 
 const Target = struct { col: u16, row: u16 };
 
+/// The tag row and the stacked-pair seam, the way the core's own hit test
+/// derives them: Tagbottom puts a pane's tag on its LAST row, which makes its
+/// FIRST row an ordinary scrollable body row and moves the h-handle down to
+/// the lower pane's first. Kept a line-for-line clone of gui.zig's
+/// webChromeTarget — the two must classify a finger identically.
 fn chromeTarget(core: *const pardes.Pardes, col: u16, row: u16) ?Target {
     if (row < pardes.TOPBAR_H) return .{ .col = col, .row = row };
     for (core.panes, 0..) |slot, id| {
         if (slot == null) continue;
         const rect = core.rects[id];
-        if (row == rect.y and col >= rect.x and col < rect.x + rect.w and col < rect.x + pardes.config.GUTTER)
-            return .{ .col = col, .row = rect.y };
+        const tag = if (core.tag_bottom) rect.y + rect.h -| pardes.BOX_H else rect.y;
+        if (row == tag and col >= rect.x and col < rect.x + rect.w and col < rect.x + pardes.config.GUTTER)
+            return .{ .col = col, .row = tag };
     }
     for (0..core.ncol -| 1) |column| {
         const handle = core.col_x[column] + core.col_w[column] -| 1;
@@ -505,15 +511,16 @@ fn chromeTarget(core: *const pardes.Pardes, col: u16, row: u16) ?Target {
         if (col < core.col_x[column] or col >= core.col_x[column] + core.col_w[column]) continue;
         for (0..core.col_n[column] -| 1) |index| {
             const rect = core.rects[core.col_terms[column][index]];
-            const handle = rect.y + rect.h -| 1;
+            const handle = if (core.tag_bottom) rect.y +| rect.h else rect.y + rect.h -| 1;
             if (row == handle) return .{ .col = col, .row = handle };
         }
     }
     for (core.panes, 0..) |slot, id| {
         if (slot == null) continue;
         const rect = core.rects[id];
-        if (row == rect.y and col >= rect.x and col < rect.x + rect.w)
-            return .{ .col = col, .row = rect.y };
+        const tag = if (core.tag_bottom) rect.y + rect.h -| pardes.BOX_H else rect.y;
+        if (row == tag and col >= rect.x and col < rect.x + rect.w)
+            return .{ .col = col, .row = tag };
     }
     for (0..core.ncol -| 1) |column| {
         const handle = core.col_x[column] + core.col_w[column] -| 1;
@@ -523,7 +530,7 @@ fn chromeTarget(core: *const pardes.Pardes, col: u16, row: u16) ?Target {
         if (col < core.col_x[column] or col >= core.col_x[column] + core.col_w[column]) continue;
         for (0..core.col_n[column] -| 1) |index| {
             const rect = core.rects[core.col_terms[column][index]];
-            const handle = rect.y + rect.h -| 1;
+            const handle = if (core.tag_bottom) rect.y +| rect.h else rect.y + rect.h -| 1;
             if (distance(row, handle) == 1) return .{ .col = col, .row = handle };
         }
     }