apprt/gtk: implement context menu

Implements context menu for GTK with:
- copy
- paste
- split right
- split down
- terminal inspector

src/apprt/gtk/App.zig

@@ -53,6 +53,9 @@ cursor_none: ?*c.GdkCursor,
 /// The shared application menu.
 menu: ?*c.GMenu = null,
 
+/// The shared context menu.
+context_menu: ?*c.GMenu = null,
+
 /// The configuration errors window, if it is currently open.
 config_errors_window: ?*ConfigErrorsWindow = null,
 
@@ -300,6 +303,7 @@ pub fn terminate(self: *App) void {
 
     if (self.cursor_none) |cursor| c.g_object_unref(cursor);
     if (self.menu) |menu| c.g_object_unref(menu);
+    if (self.context_menu) |context_menu| c.g_object_unref(context_menu);
     if (self.transient_cgroup_base) |path| self.core_app.alloc.free(path);
 
     self.config.deinit();
@@ -364,6 +368,8 @@ fn syncActionAccelerators(self: *App) !void {
     try self.syncActionAccelerator("win.new_tab", .{ .new_tab = {} });
     try self.syncActionAccelerator("win.split_right", .{ .new_split = .right });
     try self.syncActionAccelerator("win.split_down", .{ .new_split = .down });
+    try self.syncActionAccelerator("win.copy", .{ .copy_to_clipboard = {} });
+    try self.syncActionAccelerator("win.paste", .{ .paste_from_clipboard = {} });
 }
 
 fn syncActionAccelerator(
@@ -460,6 +466,7 @@ pub fn run(self: *App) !void {
     // Setup our menu items
     self.initActions();
     self.initMenu();
+    self.initContextMenu();
 
     // On startup, we want to check for configuration errors right away
     // so we can show our error window. We also need to setup other initial
@@ -786,6 +793,36 @@ fn initMenu(self: *App) void {
     self.menu = menu;
 }
 
+fn initContextMenu(self: *App) void {
+    const menu = c.g_menu_new();
+    errdefer c.g_object_unref(menu);
+
+    {
+        const section = c.g_menu_new();
+        defer c.g_object_unref(section);
+        c.g_menu_append_section(menu, null, @ptrCast(@alignCast(section)));
+        c.g_menu_append(section, "Copy", "win.copy");
+        c.g_menu_append(section, "Paste", "win.paste");
+    }
+
+    {
+        const section = c.g_menu_new();
+        defer c.g_object_unref(section);
+        c.g_menu_append_section(menu, null, @ptrCast(@alignCast(section)));
+        c.g_menu_append(section, "Split Right", "win.split_right");
+        c.g_menu_append(section, "Split Down", "win.split_down");
+    }
+
+    {
+        const section = c.g_menu_new();
+        defer c.g_object_unref(section);
+        c.g_menu_append_section(menu, null, @ptrCast(@alignCast(section)));
+        c.g_menu_append(section, "Terminal Inspector", "win.toggle_inspector");
+    }
+
+    self.context_menu = menu;
+}
+
 fn isValidAppId(app_id: [:0]const u8) bool {
     if (app_id.len > 255 or app_id.len == 0) return false;
     if (app_id[0] == '.') return false;

src/apprt/gtk/Surface.zig

@@ -1168,6 +1168,40 @@ pub fn showDesktopNotification(
     c.g_application_send_notification(g_app, body.ptr, notif);
 }
 
+fn showContextMenu(self: *Surface, x: f32, y: f32) void {
+    const window: *Window = self.container.window() orelse {
+        log.info(
+            "showContextMenu invalid for container={s}",
+            .{@tagName(self.container)},
+        );
+        return;
+    };
+
+    var point: c.graphene_point_t = .{
+        .x = x,
+        .y = y,
+    };
+    if (c.gtk_widget_compute_point(
+        self.primaryWidget(),
+        @ptrCast(window.window),
+        &c.GRAPHENE_POINT_INIT(point.x, point.y),
+        @ptrCast(&point),
+    ) == c.False) {
+        log.warn("failed computing point for context menu", .{});
+        return;
+    }
+
+    const rect: c.GdkRectangle = .{
+        .x = @intFromFloat(point.x),
+        .y = @intFromFloat(point.y),
+        .width = 1,
+        .height = 1,
+    };
+
+    c.gtk_popover_set_pointing_to(@ptrCast(@alignCast(window.context_menu)), &rect);
+    c.gtk_popover_popup(@ptrCast(@alignCast(window.context_menu)));
+}
+
 fn gtkRealize(area: *c.GtkGLArea, ud: ?*anyopaque) callconv(.C) void {
     log.debug("gl surface realized", .{});
 
@@ -1303,8 +1337,8 @@ fn scaledCoordinates(
 fn gtkMouseDown(
     gesture: *c.GtkGestureClick,
     _: c.gint,
-    _: c.gdouble,
+    x: c.gdouble,
-    _: c.gdouble,
+    y: c.gdouble,
     ud: ?*anyopaque,
 ) callconv(.C) void {
     const self = userdataSelf(ud.?);
@@ -1320,10 +1354,22 @@ fn gtkMouseDown(
         self.grabFocus();
     }
 
-    _ = self.core_surface.mouseButtonCallback(.press, button, mods) catch |err| {
+    // Allow forcing context menu to open with ctrl in apps that would normally consume the click
+    if (button == .right and mods.ctrl) {
+        self.showContextMenu(@floatCast(x), @floatCast(y));
+        return;
+    }
+
+    const consumed = self.core_surface.mouseButtonCallback(.press, button, mods) catch |err| {
         log.err("error in key callback err={}", .{err});
         return;
     };
+
+    // If a right click isn't consumed, mouseButtonCallback selects the hovered word and returns false.
+    // We can use this to handle the context menu opening under normal scenarios.
+    if (!consumed and button == .right) {
+        self.showContextMenu(@floatCast(x), @floatCast(y));
+    }
 }
 
 fn gtkMouseUp(

src/apprt/gtk/Window.zig

@@ -31,6 +31,8 @@ window: *c.GtkWindow,
 /// The notebook (tab grouping) for this window.
 notebook: *c.GtkNotebook,
 
+context_menu: *c.GtkWidget,
+
 pub fn create(alloc: Allocator, app: *App) !*Window {
     // Allocate a fixed pointer for our window. We try to minimize
     // allocations but windows and other GUI requirements are so minimal
@@ -51,6 +53,7 @@ pub fn init(self: *Window, app: *App) !void {
         .app = app,
         .window = undefined,
         .notebook = undefined,
+        .context_menu = undefined,
     };
 
     // Create the window
@@ -140,10 +143,16 @@ pub fn init(self: *Window, app: *App) !void {
     }
     c.gtk_box_append(@ptrCast(box), notebook_widget);
 
+    self.context_menu = c.gtk_popover_menu_new_from_model(@ptrCast(@alignCast(self.app.context_menu)));
+    c.gtk_widget_set_parent(self.context_menu, window);
+    c.gtk_popover_set_has_arrow(@ptrCast(@alignCast(self.context_menu)), c.False);
+    c.gtk_widget_set_halign(self.context_menu, c.GTK_ALIGN_START);
+
     // If we are in fullscreen mode, new windows start fullscreen.
     if (app.config.fullscreen) c.gtk_window_fullscreen(self.window);
 
     // All of our events
+    _ = c.g_signal_connect_data(self.context_menu, "closed", c.G_CALLBACK(&gtkRefocusTerm), self, null, c.G_CONNECT_DEFAULT);
     _ = c.g_signal_connect_data(window, "close-request", c.G_CALLBACK(&gtkCloseRequest), self, null, c.G_CONNECT_DEFAULT);
     _ = c.g_signal_connect_data(window, "destroy", c.G_CALLBACK(&gtkDestroy), self, null, c.G_CONNECT_DEFAULT);
     _ = c.g_signal_connect_data(notebook, "page-added", c.G_CALLBACK(&gtkPageAdded), self, null, c.G_CONNECT_DEFAULT);
@@ -173,6 +182,8 @@ fn initActions(self: *Window) void {
         .{ "split_right", &gtkActionSplitRight },
         .{ "split_down", &gtkActionSplitDown },
         .{ "toggle_inspector", &gtkActionToggleInspector },
+        .{ "copy", &gtkActionCopy },
+        .{ "paste", &gtkActionPaste },
     };
 
     inline for (actions) |entry| {
@@ -190,7 +201,9 @@ fn initActions(self: *Window) void {
     }
 }
 
-pub fn deinit(_: *Window) void {}
+pub fn deinit(self: *Window) void {
+    c.gtk_widget_unparent(@ptrCast(self.context_menu));
+}
 
 /// Add a new tab to this window.
 pub fn newTab(self: *Window, parent: ?*CoreSurface) !void {
@@ -399,6 +412,16 @@ fn gtkNotebookCreateWindow(
     return window.notebook;
 }
 
+fn gtkRefocusTerm(v: *c.GtkWindow, ud: ?*anyopaque) callconv(.C) bool {
+    _ = v;
+    log.debug("refocus term request", .{});
+    const self = userdataSelf(ud.?);
+
+    self.focusCurrentTab();
+
+    return true;
+}
+
 fn gtkCloseRequest(v: *c.GtkWindow, ud: ?*anyopaque) callconv(.C) bool {
     _ = v;
     log.debug("window close request", .{});
@@ -580,6 +603,32 @@ fn gtkActionToggleInspector(
     };
 }
 
+fn gtkActionCopy(
+    _: *c.GSimpleAction,
+    _: *c.GVariant,
+    ud: ?*anyopaque,
+) callconv(.C) void {
+    const self: *Window = @ptrCast(@alignCast(ud orelse return));
+    const surface = self.actionSurface() orelse return;
+    _ = surface.performBindingAction(.{ .copy_to_clipboard = {} }) catch |err| {
+        log.warn("error performing binding action error={}", .{err});
+        return;
+    };
+}
+
+fn gtkActionPaste(
+    _: *c.GSimpleAction,
+    _: *c.GVariant,
+    ud: ?*anyopaque,
+) callconv(.C) void {
+    const self: *Window = @ptrCast(@alignCast(ud orelse return));
+    const surface = self.actionSurface() orelse return;
+    _ = surface.performBindingAction(.{ .paste_from_clipboard = {} }) catch |err| {
+        log.warn("error performing binding action error={}", .{err});
+        return;
+    };
+}
+
 /// Returns the surface to use for an action.
 fn actionSurface(self: *Window) ?*CoreSurface {
     const page_idx = c.gtk_notebook_get_current_page(self.notebook);