can now move selection

main.zig

@@ -723,10 +723,18 @@ const Seat = struct {
     pointer: ?struct {
         pointer: *wl.Pointer,
         current_surface_offset: ?Point = null,
+        stage: SelectionStage = .Edit,
         selection: SelectionState = SelectionState.None(),
     } = null,
 
 
+    // awful naming but thats life innit
+    // this encodes whether the selection is actively being edited or moved as a whole
+    const SelectionStage = enum {
+        Edit,
+        Move,
+    };
+
     const SelectionTag = enum {
         none,
         pre,
@@ -745,8 +753,8 @@ const Seat = struct {
             return SelectionState.none;
         }
 
-        fn translate(self: SelectionState, delta: Point) void {
+        fn translate(self: *SelectionState, delta: Point) void {
-            switch (self) {
+            switch (self.*) {
                 .pre => |*point| {
                     point.add(delta);
                 },
@@ -757,7 +765,7 @@ const Seat = struct {
                 .post => |*box| {
                     box.translate(delta);
                 },
-                else => {return null;},
+                else => {},
             }
         }
 
@@ -817,6 +825,8 @@ const Seat = struct {
                 if (self.pointer.?.current_surface_offset) |offset| {
                     const point = xy.added(offset);
 
+                    switch (self.pointer.?.stage) {
+                        .Edit => {
                             switch (self.pointer.?.selection) {
                                 .pre => {
                                     self.pointer.?.selection = .{.updating = .{.start = point, .end = point}};
@@ -828,6 +838,27 @@ const Seat = struct {
                                 },
                                 else => {},
                             }
+                        },
+                        .Move => {
+                            const delta = blk: {
+                                switch (self.pointer.?.selection) {
+                                    .pre => |end| {
+                                        break :blk point.added(end.inverted());
+                                    },
+                                    .updating => |selection| {
+                                        break :blk point.added(selection.end.inverted());
+                                    },
+                                    else => {break :blk null;},
+                                }
+                            };
+
+                            if (delta != null) {
+                                self.pointer.?.selection.translate(delta.?);
+                                return self.calculateRedraws();
+                            }
+                        },
+                    }
+
                 }
             },
             .button => |button| {
@@ -933,10 +964,24 @@ const Seat = struct {
                                     }
 
                                 },
+                                xkb.XKB_KEY_space => {
+                                    if (self.pointer) |*ptr| {
+                                        ptr.stage = .Move;
+                                    }
+                                },
+                                else => {},
+                            }
+                        },
+                        .released => {
+                            switch (keysym) {
+                                xkb.XKB_KEY_space => {
+                                    if (self.pointer) |*ptr| {
+                                        ptr.stage = .Edit;
+                                    }
+                                },
                                 else => {},
                             }
                         },
-                        .released => {},
                         else => {},
                     }
                 }