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//! Pack layout - a geometry manager for arranging widgets.
//!
//! * also see the Tk [manual](http://www.tcl-lang.org/man/tcl8.6/TkCmd/pack.htm)
//!
//! The pack-layout is used in a "builder" style to layout a single widget:
//!
//! ```ignore
//! widget.pack()
//! .OPTION(VALUE) // 0 or more
//! .layout();
//! ```
//!
//! 1. `pack` is called first, to get the PackLayout instance.
//! 2. `layout` must be called last, to perform the layout.
//! 3. zero or more options are added to the PackLayout, to control the position
//! and layout of the widget.
use super::widget;
use super::wish;
/// Refers to the settings for a PackLayout.
///
/// Apart from `layout`, the methods on this struct set the values of different
/// options in a builder style: call `layout` to finish the layout.
///
#[derive(Clone, Debug)]
pub struct PackLayout {
id: String,
after: Option<String>,
anchor: widget::Anchor,
before: Option<String>,
expand: bool,
fill: widget::PackFill,
inside: Option<String>,
ipadx: Option<u64>,
ipady: Option<u64>,
padx: Option<u64>,
pady: Option<u64>,
side: widget::PackSide,
}
impl PackLayout {
pub(super) fn new(wid: &str) -> PackLayout {
PackLayout {
id: String::from(wid),
after: None,
anchor: widget::Anchor::Centre,
before: None,
expand: false,
fill: widget::PackFill::None,
inside: None,
ipadx: None,
ipady: None,
padx: None,
pady: None,
side: widget::PackSide::Top,
}
}
/// Inserts this widget after given widget in its container and
/// in its packing order.
pub fn after(&mut self, widget: &impl widget::TkWidget) -> &mut Self {
self.after = Some(String::from(widget.id()));
self
}
/// Specifies position of this widget with respect to its container.
pub fn anchor(&mut self, value: widget::Anchor) -> &mut Self {
self.anchor = value;
self
}
/// Inserts this widget before given widget in its container and
/// in its packing order.
pub fn before(&mut self, widget: &impl widget::TkWidget) -> &mut Self {
self.before = Some(String::from(widget.id()));
self
}
/// Specifies whether widget should expand to fit its container.
pub fn expand(&mut self, value: bool) -> &mut Self {
self.expand = value;
self
}
/// Specifies how widget should expand to fill its container.
pub fn fill(&mut self, value: widget::PackFill) -> &mut Self {
self.fill = value;
self
}
/// Inserts this widget into container of given widget at the end of
/// its packing order.
pub fn inside(&mut self, widget: &impl widget::TkWidget) -> &mut Self {
self.inside = Some(String::from(widget.id()));
self
}
/// Horizontal padding (inside content border).
pub fn ipadx(&mut self, pad: u64) -> &mut Self {
self.ipadx = Some(pad);
self
}
/// Vertical padding (inside content border).
pub fn ipady(&mut self, pad: u64) -> &mut Self {
self.ipady = Some(pad);
self
}
/// Horizontal padding (outside content border).
pub fn padx(&mut self, pad: u64) -> &mut Self {
self.padx = Some(pad);
self
}
/// Vertical padding (outside content border).
pub fn pady(&mut self, pad: u64) -> &mut Self {
self.pady = Some(pad);
self
}
/// Specifies side of container that the widget is packed against.
pub fn side(&mut self, value: widget::PackSide) -> &mut Self {
self.side = value;
self
}
/// Called last to finally create the layout with the parameter values
/// set up by the builder.
pub fn layout(&self) {
let mut msg = format!("pack {} ", self.id);
if let Some(after) = &self.after {
msg.push_str(&format!("-after {} ", after));
}
msg.push_str(&format!("-anchor {} ", self.anchor));
if let Some(before) = &self.before {
msg.push_str(&format!("-before {} ", before));
}
if self.expand {
msg.push_str("-expand 1 ");
} else {
msg.push_str("-expand 0 ");
}
msg.push_str(&format!("-fill {} ", self.fill));
if let Some(inside) = &self.inside {
msg.push_str(&format!("-inside {} ", inside));
}
if let Some(pad) = self.ipadx {
msg.push_str(&format!("-ipadx {} ", pad));
}
if let Some(pad) = self.ipady {
msg.push_str(&format!("-ipady {} ", pad));
}
if let Some(pad) = self.padx {
msg.push_str(&format!("-padx {} ", pad));
}
if let Some(pad) = self.pady {
msg.push_str(&format!("-pady {} ", pad));
}
msg.push_str(&format!("-side {} ", self.side));
wish::tell_wish(&msg);
}
}
/// Common functions for widgets that can be arranged using GridLayouts
pub trait TkPackLayout: widget::TkWidget {
/// Creates a PackLayout instance for placing this widget within its parent
fn pack(&self) -> PackLayout {
PackLayout::new(self.id())
}
/// Sets properties for widget layout
fn pack_configure(&self, option: &str, value: &str) {
let msg = format!("pack configure {} -{} {{{}}}", self.id(), option, value);
wish::tell_wish(&msg);
}
/// Removes this widget from layout
fn pack_forget(&self) {
let msg = format!("pack forget {}", self.id());
wish::tell_wish(&msg);
}
}