fixing mouse drag on web

1 files changed, 29 insertions, 0 deletions

diff --git a/pane_ui.zig b/pane_ui.zig
index f53fa269..6091cb5f 100644
--- a/pane_ui.zig
+++ b/pane_ui.zig
@@ -7,6 +7,8 @@ pub const PREFIX_W: u16 = 5;
 
 pub const Rect = struct { x: u16, y: u16, w: u16, h: u16 };
 
+pub const MousePos = struct { col: u16, row: u16 };
+
 pub const ScrollbarButton = enum { left, middle, right };
 
 pub const Scrollbar = struct {
@@ -165,6 +167,13 @@ pub fn paneAtSlots(rects: anytype, slots: anytype, col: u16, row: u16) ?usize {
     return null;
 }
 
+pub fn clampMousePos(screen_w: u16, screen_h: u16, mouse: anytype) MousePos {
+    return .{
+        .col = if (mouse.col < 0) 0 else @min(@as(u16, @intCast(mouse.col)), screen_w -| 1),
+        .row = if (mouse.row < 0) 0 else @min(@as(u16, @intCast(mouse.row)), screen_h -| 1),
+    };
+}
+
 pub fn inMoveBox(r: Rect, col: u16, row: u16) bool {
     return col < r.x + GUTTER and row < r.y + BOX_H;
 }
@@ -271,3 +280,23 @@ pub fn drawHoverResizeHints(
         }
     }
 }
+
+pub fn drawInteractionPreview(
+    win: anytype,
+    l: anytype,
+    rects: anytype,
+    col_x: anytype,
+    col_w: anytype,
+    screen_h: u16,
+    drag: anytype,
+    hover_col: u16,
+    hover_row: u16,
+    move_color: [3]u8,
+) void {
+    switch (drag) {
+        .border_v => |d| drawBorderV(win, d.cur_x, screen_h),
+        .border_h => |d| drawBorderH(win, col_x[d.col], col_w[d.col], d.cur_y),
+        .move => |d| drawMovePreview(win, l, col_x, col_w, d.cur_x, d.cur_y, move_color),
+        else => drawHoverResizeHints(win, l, rects, col_x, col_w, screen_h, hover_col, hover_row),
+    }
+}