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ui: limit scroll to oldest message, draw indicator
+39
+39
src/irc.zig
+39
src/irc.zig
···
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history_requested: bool = false,
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who_requested: bool = false,
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at_oldest: bool = false,
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+
can_scroll_up: bool = false,
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// The MARKREAD state of this channel
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last_read: u32 = 0,
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// The location of the last read indicator. This doesn't necessarily match the state of
···
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// Scroll up
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if (self.scroll.pending > 0) {
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// Check if we can scroll up. If we can't, we are done
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if (!self.can_scroll_up) {
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self.scroll.pending = 0;
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return;
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}
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// Consume 1 line, and schedule a tick
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self.scroll.offset += 1;
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self.scroll.pending -= 1;
···
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// We will set the msg offset too to prevent any bumping of the scroll state when we get
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// a new message
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self.scroll.msg_offset = self.messages.items.len;
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}
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// Set the can_scroll_up flag. this is true if we drew past the top of the screen
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self.can_scroll_up = row <= 0;
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if (row > 0) {
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// If we didn't draw past the top of the screen, we must have reached the end of
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// history. Draw an indicator letting the user know this
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const bot = "━";
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var writer = try std.ArrayList(u8).initCapacity(ctx.arena, bot.len * max.width);
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try writer.writer().writeBytesNTimes(bot, max.width);
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const border: vxfw.Text = .{
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.text = writer.items,
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.style = .{ .fg = .{ .index = 8 } },
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.softwrap = false,
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};
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const unread: vxfw.SubSurface = .{
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.origin = .{ .col = 0, .row = row },
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.surface = try border.draw(ctx),
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};
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try children.append(unread);
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const no_more_history: vxfw.Text = .{
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.text = "No more history",
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.style = .{ .fg = .{ .index = 8 } },
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.softwrap = false,
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};
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const no_history_surf = try no_more_history.draw(ctx);
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const new_sub: vxfw.SubSurface = .{
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.origin = .{ .col = (max.width -| no_history_surf.size.width) / 2, .row = row },
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.surface = no_history_surf,
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};
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try children.append(new_sub);
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}
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if (did_scroll_to_last_read) {