pits and exits

res/main.glade

@@ -72,10 +72,40 @@
                     <property name="hexpand">True</property>
                     <property name="vexpand">True</property>
                     <child>
-                      <placeholder/>
+                      <object class="GtkEventBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <signal name="drag-begin" handler="drag_begin" swapped="no"/>
+                        <child>
+                          <object class="GtkLabel">
+                            <property name="visible">True</property>
+                            <property name="can_focus">False</property>
+                            <property name="label" translatable="yes">label</property>
+                            <signal name="drag-begin" handler="drag_begin" swapped="no"/>
+                          </object>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">1</property>
+                        <property name="top_attach">0</property>
+                      </packing>
                     </child>
                     <child>
-                      <placeholder/>
+                      <object class="GtkEventBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <child>
+                          <object class="GtkLabel">
+                            <property name="visible">True</property>
+                            <property name="can_focus">False</property>
+                            <property name="label" translatable="yes">label</property>
+                          </object>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">1</property>
+                        <property name="top_attach">1</property>
+                      </packing>
                     </child>
                     <child>
                       <placeholder/>

src/grid.rs

@@ -18,7 +18,7 @@ impl Grid {
                 CellPosition(x,y)
             );
             cell.inner.connect_clicked(app_state.clone());
-            cell.inner.connect_drag_drop(app_state.clone());
+            cell.inner.connect_dragging(app_state.clone());
             inner.attach(cell.as_ref(), x, y, 1, 1);
         }
         Grid { inner }
@@ -43,7 +43,6 @@ impl CellWidget {
             builder
                 .get_object("cell")
                 .unwrap();
-        eventbox.set_events(gdk::EventMask::BUTTON_PRESS_MASK);
 
         let header: gtk::Label =
             builder
@@ -55,6 +54,19 @@ impl CellWidget {
                 .get_object("position")
                 .unwrap();
         position.set_text(&format!("{}x{}", pos.0, pos.1));
+        // Drag-and-drop capacity
+        let targets = vec![];
+        eventbox.drag_source_set(
+            gdk::ModifierType::MODIFIER_MASK,
+            &targets,
+            gdk::DragAction::COPY,
+        );
+        eventbox.drag_dest_set(
+            gtk::DestDefaults::ALL,
+            &targets,
+            gdk::DragAction::COPY,
+        );
+
 
         let cell = CellWidget {
             eventbox,
@@ -80,31 +92,46 @@ impl CellWidget {
             });
     }
 
-    pub fn connect_drag_drop(&self, _state: AppState) {
+    pub fn connect_dragging(&self, state: AppState) {
-        // Drag-and-drop capacity
-        let targets = vec![];
-        self.eventbox.drag_dest_set(
-            gtk::DestDefaults::ALL,
-            &targets,
-            gdk::DragAction::COPY,
-        );
-        self.eventbox.drag_source_set(
-            gdk::ModifierType::MODIFIER_MASK,
-            &targets,
-            gdk::DragAction::COPY,
-        );
 
-        //let app_state = state.clone();
+        // TODO: start over.
-        self.eventbox.connect_drag_begin(|_,_| {
+        // Use this for reference :
+        // https://python-gtk-3-tutorial.readthedocs.io/en/latest/drag_and_drop.html
+
+        // For starters, avoid using app_state and just copy the content of
+        // source cell inside dest cell.
+
+        let state1 = state.clone();
+        self.eventbox.connect_drag_begin(move |_,_| {
             println!("Lift...");
+            let mut state = state1.borrow_mut();
+            state.pending = Some(pawn::PawnData{name: "Dropped".to_string(), position: None});
             // Copy the current instance data
             // inside app_state.pending
         });
-        self.eventbox.connect_drag_end(|_,_| {
+        // TODO: Add failed signal to remove data
+        let state2 = state.clone();
+        let content = self.content.clone();
+        self.eventbox.connect_drag_end(move |_,_| {
             println!("Drop !");
+            let mut state = state2.borrow_mut();
+            if state.pending.is_none() {
+                content.set_text("Emptied");
+            }
+            state.pending = None;
             // Same as clicked, grab data
         });
-        // TODO: Add failed signal to remove data
+        let state3 = state.clone();
+        let content = self.content.clone();
+        self.eventbox.connect_drag_drop(move |_,drag_ctx,_,_,time| {
+            println!("Got ! {:?}", "");
+            let mut state = state3.borrow_mut();
+            if let Some(data) = state.pending.take() {
+                content.set_text(&data.name);
+            };
+            drag_ctx.drag_finish(true, true, time);
+            gtk::Inhibit(true)
+        });
    }
 }
 

src/pawn.rs

@@ -1,16 +1,19 @@
 
 use super::*;
 
+/// A wrapper around gtk::ListBox for Pawns
 #[derive(Debug,Clone)]
 pub struct PawnList {
     inner: gtk::ListBox,
 }
 
 impl PawnList {
+    /// Initialize from the given existing ListBox
     pub fn init(inner: gtk::ListBox) -> Self {
         PawnList{ inner }
     }
 
+    /// Adds a Pawn to the list
     pub fn add(&self, pawn: &Pawn) {
         let row = gtk::ListBoxRow::new();
         row.add(pawn.as_ref());
@@ -18,12 +21,14 @@ impl PawnList {
     }
 }
 
+/// Application data related to a Pawn
 #[derive(Debug,Clone)]
 pub struct PawnData {
     pub name: String,
     pub position: Option<String>, // Content of label from CellWidget
 }
 
+/// A wrapper widget for pawns.
 #[derive(Debug, Clone)]
 pub struct Pawn {
     data: PawnData,