initialTreeUpdate

Creates the initial tree update when accessibility information is first requested by the OS The initial tree only contains basic window details. These are updated when frameTreeUpdate runs. Note: This callback can occur on a non-gui thread.

Parameters

instance:?*anyopaque: ?*anyopaque

Source

Implementation

pub fn initialTreeUpdate(instance: ?*anyopaque) callconv(.c) ?*TreeUpdate {
    var self: *AccessKit = @ptrCast(@alignCast(instance));
    const io = dvui.io;
    self.mutex.lockUncancelable(io);
    defer self.mutex.unlock(io);

    const root = nodeNew(Role.window.asU8()) orelse @panic("null");
    const tree = treeNew(0) orelse @panic("null");
    const result = treeUpdateWithCapacityAndFocus(1, 0);
    treeUpdateSetTree(result, tree);
    treeUpdatePushNode(result, 0, root);
    self.status = .starting;

    // Refresh so that the full tree is sent next frame.
    const window: *dvui.Window = @alignCast(@fieldParentPtr("accesskit", self));
    dvui.refresh(window, @src(), null);
    return result;
}