How to: Create Dynamic layouts
With real world applications, the content can often be dynamic. For example, a chat application may need to resize the chat input area based on the number of incoming messages. To achieve this, you can generate layouts dynamically:
fn get_layout_based_on_messages(msg_count: usize, f: &Frame) -> Rc<[Rect]> {
let msg_percentage = if msg_count > 50 { 80 } else { 50 };
Layout::default()
.direction(Direction::Vertical)
.constraints([
Constraint::Percentage(msg_percentage),
Constraint::Percentage(100 - msg_percentage),
])
.split(f.size())
}
You can even update the layout based on some user input or command:
match action {
Action::IncreaseSize => {
current_percentage += 5;
if current_percentage > 95 {
current_percentage = 95;
}
},
Action::DecreaseSize => {
current_percentage -= 5;
if current_percentage < 5 {
current_percentage = 5;
}
},
_ => {}
}
let chunks = Layout::default()
.direction(Direction::Horizontal)
.constraints([
Constraint::Percentage(current_percentage),
Constraint::Percentage(100 - current_percentage),
])
.split(f.size());