refactor: use a builder for block building

src/app/widgets.rs

@@ -3,13 +3,7 @@ use std::time::Instant;
 use crossterm::event::{KeyEvent, MouseEvent};
 use enum_dispatch::enum_dispatch;
 use indextree::NodeId;
-use tui::{
-    backend::Backend,
-    layout::Rect,
-    text::Span,
-    widgets::{Block, Borders, TableState},
-    Frame,
-};
+use tui::{backend::Backend, layout::Rect, widgets::TableState, Frame};
 
 use crate::{
     app::{
@@ -21,7 +15,7 @@ use crate::{
     options::layout_options::LayoutRule,
 };
 
-mod tui_widgets;
+mod tui_stuff;
 
 pub mod base;
 pub use base::*;
@@ -29,6 +23,8 @@ pub use base::*;
 pub mod bottom_widgets;
 pub use bottom_widgets::*;
 
+use self::tui_stuff::BlockBuilder;
+
 use super::data_farmer::DataCollection;
 
 /// A trait for things that are drawn with state.
@@ -121,28 +117,10 @@ pub trait Widget {
     /// Returns a [`Widget`]'s "pretty" display name.
     fn get_pretty_name(&self) -> &'static str;
 
-    /// Returns a new [`Block`]. The default implementation returns
-    /// a basic [`Block`] with different border colours based on selected state.
-    fn block<'a>(&self, painter: &'a Painter, is_selected: bool, borders: Borders) -> Block<'a> {
-        let has_top_bottom_border =
-            borders.contains(Borders::TOP) || borders.contains(Borders::BOTTOM);
-
-        let block = Block::default()
-            .border_style(if is_selected {
-                painter.colours.highlighted_border_style
-            } else {
-                painter.colours.border_style
-            })
-            .borders(borders);
-
-        if has_top_bottom_border {
-            block.title(Span::styled(
-                format!(" {} ", self.get_pretty_name()),
-                painter.colours.widget_title_style,
-            ))
-        } else {
-            block
-        }
+    /// Returns a new [`BlockBuilder`], which can become a [`Block`] if [`BlockBuilder::build`] is called.
+    /// The default implementation builds a [`Block`] that has all 4 borders with no selection or expansion.
+    fn block(&self) -> BlockBuilder {
+        BlockBuilder::new(self.get_pretty_name())
     }
 
     /// Draws a [`Widget`]. The default implementation draws nothing.

src/app/widgets/base/time_graph.rs

@@ -16,7 +16,7 @@ use tui::{
 use crate::{
     app::{
         event::WidgetEventResult,
-        widgets::tui_widgets::{
+        widgets::tui_stuff::{
             custom_legend_chart::{Axis, Dataset},
             TimeChart,
         },

src/app/widgets/bottom_widgets/basic_cpu.rs

@@ -8,7 +8,7 @@ use tui::{
 };
 
 use crate::{
-    app::{widgets::tui_widgets::PipeGauge, AppConfigFields, Component, DataCollection, Widget},
+    app::{widgets::tui_stuff::PipeGauge, AppConfigFields, Component, DataCollection, Widget},
     canvas::Painter,
     constants::SIDE_BORDERS,
     options::layout_options::LayoutRule,

src/app/widgets/bottom_widgets/basic_mem.rs

@@ -8,7 +8,7 @@ use tui::{
 
 use crate::{
     app::{
-        event::WidgetEventResult, widgets::tui_widgets::PipeGauge, Component, DataCollection,
+        event::WidgetEventResult, widgets::tui_stuff::PipeGauge, Component, DataCollection,
         Widget,
     },
     canvas::Painter,

src/app/widgets/bottom_widgets/battery.rs

@@ -15,7 +15,7 @@ use tui::{
 use crate::{
     app::{
         data_farmer::DataCollection, does_bound_intersect_coordinate, event::WidgetEventResult,
-        widgets::tui_widgets::PipeGauge, Component, Widget,
+        widgets::tui_stuff::PipeGauge, Component, Widget,
     },
     canvas::Painter,
     constants::TABLE_GAP_HEIGHT_LIMIT,
@@ -178,7 +178,11 @@ impl Widget for BatteryTable {
     fn draw<B: Backend>(
         &mut self, painter: &Painter, f: &mut Frame<'_, B>, area: Rect, selected: bool,
     ) {
-        let block = self.block(painter, selected, self.block_border);
+        let block = self
+            .block()
+            .selected(selected)
+            .borders(self.block_border)
+            .build(painter);
 
         let inner_area = block.inner(area);
         const CONSTRAINTS: [Constraint; 2] = [Constraint::Length(1), Constraint::Min(0)];

src/app/widgets/bottom_widgets/cpu.rs

@@ -227,11 +227,10 @@ impl Widget for CpuGraph {
             })
             .collect::<Vec<_>>();
 
-        let graph_block = self.block(
-            painter,
-            selected && matches!(&self.selected, CpuGraphSelection::Graph),
-            Borders::ALL,
-        );
+        let graph_block = self
+            .block()
+            .selected(selected && matches!(&self.selected, CpuGraphSelection::Graph))
+            .build(painter);
 
         self.graph.draw_tui_chart(
             painter,

src/app/widgets/bottom_widgets/disk.rs

@@ -122,7 +122,11 @@ impl Widget for DiskTable {
     fn draw<B: Backend>(
         &mut self, painter: &Painter, f: &mut Frame<'_, B>, area: Rect, selected: bool,
     ) {
-        let block = self.block(painter, selected, self.block_border);
+        let block = self
+            .block()
+            .selected(selected)
+            .borders(self.block_border)
+            .build(painter);
 
         self.table
             .draw_tui_table(painter, f, &self.display_data, block, area, selected);

src/app/widgets/bottom_widgets/mem.rs

@@ -1,7 +1,7 @@
 use std::{borrow::Cow, collections::HashMap, time::Instant};
 
 use crossterm::event::{KeyEvent, MouseEvent};
-use tui::{backend::Backend, layout::Rect, widgets::Borders};
+use tui::{backend::Backend, layout::Rect};
 
 use crate::{
     app::{event::WidgetEventResult, time_graph::TimeGraphData, DataCollection},
@@ -89,7 +89,7 @@ impl Widget for MemGraph {
         &mut self, painter: &crate::canvas::Painter, f: &mut tui::Frame<'_, B>, area: Rect,
         selected: bool,
     ) {
-        let block = self.block(painter, selected, Borders::ALL);
+        let block = self.block().selected(selected).build(painter);
 
         let mut chart_data = Vec::with_capacity(2);
         if let Some((label_percent, label_frac)) = &self.mem_labels {

src/app/widgets/bottom_widgets/net.rs

@@ -518,7 +518,7 @@ impl Widget for NetGraph {
     fn draw<B: Backend>(
         &mut self, painter: &Painter, f: &mut Frame<'_, B>, area: Rect, selected: bool,
     ) {
-        let block = self.block(painter, selected, Borders::ALL);
+        let block = self.block().selected(selected).build(painter);
 
         self.set_draw_cache();
 

src/app/widgets/bottom_widgets/process.rs

@@ -1233,11 +1233,11 @@ impl Widget for ProcessManager {
             area
         };
 
-        let process_block = self.block(
-            painter,
-            selected && matches!(self.selected, ProcessManagerSelection::Processes),
-            self.block_border,
-        );
+        let process_block = self
+            .block()
+            .selected(selected && matches!(self.selected, ProcessManagerSelection::Processes))
+            .borders(self.block_border)
+            .build(painter);
 
         self.process_table.draw_tui_table(
             painter,

src/app/widgets/bottom_widgets/temp.rs

@@ -133,7 +133,11 @@ impl Widget for TempTable {
     fn draw<B: Backend>(
         &mut self, painter: &Painter, f: &mut Frame<'_, B>, area: Rect, selected: bool,
     ) {
-        let block = self.block(painter, selected, self.block_border);
+        let block = self
+            .block()
+            .selected(selected)
+            .borders(self.block_border)
+            .build(painter);
 
         self.table
             .draw_tui_table(painter, f, &self.display_data, block, area, selected);

src/app/widgets/tui_stuff.rs

@@ -3,3 +3,6 @@ pub use custom_legend_chart::TimeChart;
 
 pub mod pipe_gauge;
 pub use pipe_gauge::PipeGauge;
+
+pub mod block_builder;
+pub use block_builder::BlockBuilder;

src/app/widgets/tui_stuff/block_builder.rs

@@ -0,0 +1,74 @@
+use tui::{
+    text::Span,
+    widgets::{Block, Borders},
+};
+
+use crate::canvas::Painter;
+
+/// A factory pattern builder for a tui [`Block`].
+pub struct BlockBuilder {
+    borders: Borders,
+    selected: bool,
+    expanded: bool,
+    name: &'static str,
+    extra_text: Option<String>,
+}
+
+impl BlockBuilder {
+    /// Creates a new [`BlockBuilder`] with the name of block.
+    pub fn new(name: &'static str) -> Self {
+        Self {
+            borders: Borders::ALL,
+            selected: false,
+            expanded: false,
+            name,
+            extra_text: None,
+        }
+    }
+
+    /// Indicates that this block is currently selected, and should be drawn as such.
+    pub fn selected(mut self, selected: bool) -> Self {
+        self.selected = selected;
+        self
+    }
+
+    /// Indicates that this block is currently expanded, and should be drawn as such.
+    pub fn expanded(mut self, expanded: bool) -> Self {
+        self.expanded = expanded;
+        self
+    }
+
+    /// Indicates that this block has some extra text beyond the name.
+    pub fn extra_text(mut self, extra_text: String) -> Self {
+        self.extra_text = Some(extra_text);
+        self
+    }
+
+    /// Determines the borders of the built [`Block`].
+    pub fn borders(mut self, borders: Borders) -> Self {
+        self.borders = borders;
+        self
+    }
+
+    pub fn build<'a>(self, painter: &'a Painter) -> Block<'a> {
+        let has_top_bottom_border =
+            self.borders.contains(Borders::TOP) || self.borders.contains(Borders::BOTTOM);
+
+        let block = Block::default()
+            .border_style(if self.selected {
+                painter.colours.highlighted_border_style
+            } else {
+                painter.colours.border_style
+            })
+            .borders(self.borders);
+
+        if has_top_bottom_border {
+            block.title(Span::styled(
+                format!(" {} ", self.name),
+                painter.colours.widget_title_style,
+            ))
+        } else {
+            block
+        }
+    }
+}