From 3f09b57ed0a2b359d12197528dadfe0d4bca1a55 Mon Sep 17 00:00:00 2001
From: Raphael Robatsch <raphael-git@tapesoftware.net>
Date: Fri, 22 Oct 2021 17:26:05 +0200
Subject: [PATCH] Add click handling

---
 src/bar.cpp  | 14 ++++++++++++-
 src/bar.hpp  |  2 ++
 src/main.cpp | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 70 insertions(+), 1 deletion(-)

diff --git a/src/bar.cpp b/src/bar.cpp
index 7134eb7..f180bc1 100644
--- a/src/bar.cpp
+++ b/src/bar.cpp
@@ -60,6 +60,17 @@ Bar::~Bar()
     zwlr_layer_surface_v1_destroy(_layerSurface);
 }
 
+void Bar::click(int x, int)
+{
+    for (auto tag=_tags.rbegin(); tag != _tags.rend(); tag++) {
+        if (x > tag->x) {
+            tag->active = !tag->active;
+            invalidate();
+            return;
+        }
+    }
+}
+
 void Bar::invalidate()
 {
     if (_invalid) return;
@@ -119,7 +130,8 @@ void Bar::setColorScheme(const ColorScheme &scheme)
 
 void Bar::renderTags()
 {
-    for (const auto &tag : _tags) {
+    for (auto &tag : _tags) {
+        tag.x = _x;
         setColorScheme(tag.active ? colorActive : colorInactive);
         renderText(tag.name);
     }
diff --git a/src/bar.hpp b/src/bar.hpp
index 5798f7d..f60588c 100644
--- a/src/bar.hpp
+++ b/src/bar.hpp
@@ -15,6 +15,7 @@
 struct Tag {
     QString name;
     bool active;
+    int x;
 };
 
 class Bar {
@@ -45,5 +46,6 @@ class Bar {
 public:
     explicit Bar(const wl_output *output);
     void setStatus(const QString &status);
+    void click(int x, int y);
     ~Bar();
 };
diff --git a/src/main.cpp b/src/main.cpp
index b4b87db..a93ecfe 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -9,6 +9,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
+#include <linux/input-event-codes.h>
 #include <optional>
 #include <QGuiApplication>
 #include <QSocketNotifier>
@@ -43,11 +44,62 @@ static const struct xdg_wm_base_listener xdgWmBaseListener = {
     }
 };
 
+struct PointerState {
+    wl_pointer *pointer;
+    Bar *focusedBar;
+    int x, y;
+    bool leftButtonClick;
+};
+static PointerState pointerState;
+static const struct wl_pointer_listener pointerListener = {
+    .enter = [](void*, wl_pointer*, uint32_t serial, wl_surface*, wl_fixed_t x, wl_fixed_t y)
+    {
+        pointerState.focusedBar = &bar.value();
+    },
+    .leave = [](void*, wl_pointer*, uint32_t serial, wl_surface*) {
+        pointerState.focusedBar = nullptr;
+    },
+    .motion = [](void*, wl_pointer*, uint32_t, wl_fixed_t x, wl_fixed_t y) {
+        pointerState.x = wl_fixed_to_int(x);
+        pointerState.y = wl_fixed_to_int(y);
+    },
+    .button = [](void*, wl_pointer*, uint32_t, uint32_t, uint32_t button, uint32_t pressed) {
+        if (button == BTN_LEFT) {
+            pointerState.leftButtonClick = pressed == WL_POINTER_BUTTON_STATE_PRESSED;
+        }
+    },
+    .axis = [](void*, wl_pointer*, uint32_t, uint32_t, wl_fixed_t) { },
+    .frame = [](void*, wl_pointer*) {
+        if (!pointerState.focusedBar) return;
+        if (pointerState.leftButtonClick) {
+            pointerState.leftButtonClick = false;
+            pointerState.focusedBar->click(pointerState.x, pointerState.y);
+        }
+    },
+    .axis_source = [](void*, wl_pointer*, uint32_t) { },
+    .axis_stop = [](void*, wl_pointer*, uint32_t, uint32_t) { },
+    .axis_discrete = [](void*, wl_pointer*, uint32_t, int32_t) { },
+};
+
+static wl_seat *seat;
+static const struct wl_seat_listener seatListener = {
+    [](void*, wl_seat*, uint32_t cap)
+    {
+        if (cap & WL_SEAT_CAPABILITY_POINTER) {
+            printf("got pointer");
+            pointerState.pointer = wl_seat_get_pointer(seat);
+            wl_pointer_add_listener(pointerState.pointer, &pointerListener, nullptr);
+        }
+    },
+    [](void*, wl_seat*, const char *name) { }
+};
+
 // called after we have received the initial batch of globals
 static void onReady()
 {
     requireGlobal(compositor, "wl_compositor");
     requireGlobal(shm, "wl_shm");
+    requireGlobal(seat, "wl_seat");
     requireGlobal(wlrLayerShell, "zwlr_layer_shell_v1");
     setupStatusFifo();
     bar.emplace(nullptr);
@@ -119,6 +171,9 @@ static void registryHandleGlobal(void*, wl_registry *registry, uint32_t name, co
         xdg_wm_base_add_listener(xdgWmBase, &xdgWmBaseListener, nullptr);
         return;
     }
+    if (seat == nullptr && reg.handle(seat, wl_seat_interface, 7)) {
+        wl_seat_add_listener(seat, &seatListener, nullptr);
+    }
 }
 static const struct wl_registry_listener registry_listener = { registryHandleGlobal, nullptr };