From 12e7958886433c6124ba98580b55d79067d53fce Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?St=C3=A9phane=20Cerveau?= <scerveau@collabora.com>
Date: Mon, 15 Nov 2021 17:27:08 +0100
Subject: [PATCH] mainwindow: can now draw a vector of rectangles.

---
 Cargo.lock        |  1 +
 Cargo.toml        |  3 ++-
 src/mainwindow.rs | 37 +++++++++++++++++++++++++------------
 3 files changed, 28 insertions(+), 13 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 033269f..6868766 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -292,6 +292,7 @@ dependencies = [
 name = "gst_pipeline_studio"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "gtk",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index c8b4c38..23d532c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,4 +6,5 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-gtk = "0.14.3"
\ No newline at end of file
+gtk = "0.14.3"
+anyhow = "1"
diff --git a/src/mainwindow.rs b/src/mainwindow.rs
index 8e21710..11523fd 100644
--- a/src/mainwindow.rs
+++ b/src/mainwindow.rs
@@ -1,5 +1,4 @@
-use gtk::ffi::GtkDrawingArea;
-use gtk::gdk::Display;
+use gtk::cairo::Context;
 use gtk::glib;
 use gtk::prelude::*;
 use gtk::{
@@ -9,6 +8,20 @@ use gtk::{
 use std::cell::RefCell;
 use std::rc::Rc;
 
+#[derive(Debug, Clone, Default)]
+struct Element {
+    name: String,
+    position: (f64, f64),
+    size: (f64, f64),
+}
+
+fn draw_elements(elements: &Vec<Element>, c: &Context) {
+    for element in elements {
+        c.rectangle(element.position.0, element.position.1, 80.0, 45.0);
+        c.fill().expect("Can not draw into context");
+    }
+}
+
 pub fn build_ui(application: &gtk::Application) {
     let glade_src = include_str!("gps.ui");
     let builder = Builder::from_string(glade_src);
@@ -25,20 +38,20 @@ pub fn build_ui(application: &gtk::Application) {
     let event_box = EventBox::new();
     event_box.add(&drawing_area);
     view_port.add(&event_box);
-    let mut position = (0.0, 0.0);
-    let position = Rc::new(RefCell::new((0.0, 0.0)));
-    let p_clone = position.clone();
+    let elements: Rc<RefCell<Vec<Element>>> = Rc::new(RefCell::new(vec![]));
+    let e_clone = elements.clone();
     drawing_area.connect_draw(move |w, c| {
-        println!("w: {} c:{} p: {:?}", w, c, p_clone);
-        c.rectangle(p_clone.borrow().0, p_clone.borrow().1, 10.0, 20.0);
-        c.fill();
+        println!("w: {} c:{} e: {:?}", w, c, e_clone);
+        draw_elements(&e_clone.borrow().to_vec(), c);
         gtk::Inhibit(false)
     });
 
-    event_box.connect_button_release_event(move |w, evt| {
-        let mut p = position.borrow_mut();
-        p.0 = evt.position().0; // = evt.position().clone();
-        p.1 = evt.position().1;
+    event_box.connect_button_release_event(move |_w, evt| {
+        let mut elements = elements.borrow_mut();
+        let mut element: Element = Default::default();
+        element.position.0 = evt.position().0;
+        element.position.1 = evt.position().1;
+        elements.push(element);
         drawing_area.queue_draw();
         gtk::Inhibit(false)
     });