Add touchscreen support with onscreen keyboard (#1)

Possible that framebuffer doesn't update without actual keypress (eg, volume down). But, works.

src/components/mod.rs

@@ -7,6 +7,7 @@ use crate::window_manager::DrawInstructions;
 pub mod toggle_button;
 pub mod highlight_button;
 pub mod paragraph;
+pub mod press_button;
 
 pub trait Component<T> {
   fn handle_message(&mut self, message: WindowMessage) -> Option<T>;
@@ -17,6 +18,7 @@ pub trait Component<T> {
   //focusing for components is purely to give a visual representation
   fn focusable(&self) -> bool;
   fn clickable(&self) -> bool;
+  //fn pressable(&self) -> bool; //touch
   fn name(&self) -> &String; //should be unique
 }
 

src/components/press_button.rs

@@ -0,0 +1,69 @@
+use std::vec;
+use std::vec::Vec;
+
+use crate::components::Component;
+use crate::framebuffer::{ Dimensions, Point };
+use crate::themes::ThemeInfo;
+use crate::messages::WindowMessage;
+use crate::window_manager::{ DrawInstructions };
+
+const MONO_WIDTH: u8 = 10;
+
+pub struct PressButton<T> {
+  pub top_left: Point,
+  pub size: Dimensions,
+  text: String,
+  press_return: T,
+}
+
+impl<T: Clone> Component<T> for PressButton<T> {
+  //
+  fn handle_message(&mut self, message: WindowMessage) -> Option<T> {
+    match message {
+      WindowMessage::Touch(_, _) => {
+        //assume that the parent window-like passed it to us intentionally and checked already
+        //we can check again, but why?
+        Some(self.press_return.clone())
+      },
+      _ => None,
+    }
+  }
+
+  fn draw(&self, theme_info: &ThemeInfo) -> Vec<DrawInstructions> {
+    let half = self.size[0] / 2 - self.text.len() * MONO_WIDTH as usize / 2;
+    vec![
+      DrawInstructions::Rect(self.top_left, [self.size[0], 1], theme_info.border_left_top),
+      DrawInstructions::Rect(self.top_left, [1, self.size[1]], theme_info.border_left_top),
+      DrawInstructions::Rect([self.top_left[0], self.top_left[1] + self.size[1]], [self.size[0], 1], theme_info.border_right_bottom),
+      DrawInstructions::Rect([self.top_left[0] + self.size[0], self.top_left[1]], [1, self.size[1]], theme_info.border_right_bottom),
+      //assume normal background colour
+      DrawInstructions::Text([self.top_left[0] + half, self.top_left[1] + 8], vec!["times-new-romono".to_string()], self.text.clone(), theme_info.text, theme_info.background, Some(0), Some(MONO_WIDTH)),
+    ]
+  }
+
+  //properties
+  fn focusable(&self) -> bool {
+    false
+  }
+
+  fn clickable(&self) -> bool {
+    false
+  }
+  
+  fn name(&self) -> &String {
+    //sorry
+    &self.text
+  }
+}
+
+impl<T> PressButton<T> {
+  pub fn new(top_left: Point, size: Dimensions, text: String, press_return: T) -> Self {
+    Self {
+      top_left,
+      size,
+      text,
+      press_return,
+    }
+  }
+}
+