Check button clicks and trigger actions

4 files changed, 88 insertions, 12 deletions

diff --git a/src/comet.c b/src/comet.c
index 21bad7a..2b0cf40 100644
--- a/src/comet.c
+++ b/src/comet.c
@@ -39,6 +39,11 @@ static void log_handler(const char *log_domain,
         g_print("%s\n", message);
 }
 
+static void action(Button *btn)
+{
+    log_info("Called action: %s", btn->text);
+}
+
 int main(int argc, char **argv)
 {
     g_log_set_default_handler(log_handler, (gpointer)G_LOG_LEVEL_DEBUG);
@@ -65,10 +70,12 @@ int main(int argc, char **argv)
     for (int i = 0; i < 9; ++i) {
         char text[] = { '1' + i, '\0' };
         Button *btn = button_create(text, true);
+        button_set_action(btn, action);
         state_add_button(state, btn);
     }
 
     Button *btn = button_create("long button", false);
+    button_set_action(btn, action);
     state_add_button(state, btn);
 
     draw_compute_layout(draw, state->btns, window_get_context(win));
diff --git a/src/connect.c b/src/connect.c
index 9272a5c..bc45812 100644
--- a/src/connect.c
+++ b/src/connect.c
@@ -48,6 +48,62 @@ static void update_scale(Connection *con)
     }
 }
 
+static inline bool in_rect(int px, int py, int x, int y, int w, int h)
+{
+    return px >= x && px <= x + w && py >= y && py <= y + h;
+}
+
+static inline bool in_circle(int px, int py, int x, int y, int r)
+{
+    int dx = x - px;
+    int dy = y - py;
+    return (dx * dx + dy * dy) <= r * r;
+}
+
+static inline bool in_capsule(int px, int py, int x, int y, int w, int h)
+{
+    g_assert(w >= h);
+    int radius = h / 2;
+
+    // Circle case
+    if (w == h) return in_circle(px, py, x + radius, y + radius, radius);
+
+    // Capsule case
+    return in_circle(px, py, x + radius, y + radius, radius)
+        || in_circle(px, py, x + w - radius, y + radius, radius)
+        || in_rect(px, py, x + radius, y, w - 2 * radius, h);
+}
+
+static void button_action(State *state, xcb_button_release_event_t *button)
+{
+    log_debug("Button release event [x=%d, y=%d]", button->event_x, button->event_y);
+
+    for (GList *it = state->draw->layouts; it != NULL; it = it->next) {
+        Layout *layout = it->data;
+
+        // Skip
+        if (layout->x + layout->width < button->event_x) continue;
+        if (layout->x > button->event_x) break;
+
+        bool check = in_capsule(button->event_x, button->event_y,
+                                layout->x, layout->y,
+                                layout->width, layout->height);
+
+        log_debug("Button layout [x=%d, y=%d, w=%d, h=%d]",
+                  layout->x, layout->y, layout->width, layout->height);
+
+        if (check) {
+            log_debug("Triggering action for button");
+            if (layout->btn->action != NULL) {
+                layout->btn->action(layout->btn);
+            }
+            return;
+        }
+    }
+
+    log_debug("Ignoring button release");
+}
+
 typedef struct {
     GSource source;
     Connection *con;
@@ -115,9 +171,21 @@ static gboolean source_dispatch(GSource *source, GSourceFunc callback, gpointer
             }
 
             case XCB_BUTTON_RELEASE: {
-                log_debug("Mouse event");
-
-                // TODO: Handle click generically by translating the button code
+                xcb_button_release_event_t *button = (xcb_button_release_event_t *)xsource->event;
+                log_debug("Processing event 'ButtonRelease' [type=%d]", XCB_BUTTON_RELEASE);
+
+                // TODO: Handle different actions properly
+                switch (button->detail) {
+                    case XCB_BUTTON_INDEX_2: // left click
+                    case XCB_BUTTON_INDEX_1: // right click
+                    case XCB_BUTTON_INDEX_3: // middle click
+                        button_action(xsource->con->state, button);
+                        break;
+
+                    default:
+                        log_debug("Ignoring button release [button=%d]", button->detail);
+                        break;
+                }
                 break;
             }
 
diff --git a/src/draw.c b/src/draw.c
index 8a2a6bd..d9e999b 100644
--- a/src/draw.c
+++ b/src/draw.c
@@ -12,14 +12,6 @@
 // (this will also work for animations in the future)
 // or use some flags to trigger drawing
 
-typedef struct {
-    Button *btn;
-    int x, y;
-    int width, height;
-    int text_w, text_h;
-    PangoLayout *pl;
-} Layout;
-
 static void layout_destroy(Layout *layout)
 {
     g_object_unref(layout->pl);
@@ -114,7 +106,6 @@ void draw_paint(Drawable *draw, Window *win)
 
         pango_cairo_update_layout(cr, layout->pl);
         pango_cairo_show_layout(cr, layout->pl);
-
     }
 
     cairo_destroy(cr);
diff --git a/src/draw.h b/src/draw.h
index c4f88e6..9c46900 100644
--- a/src/draw.h
+++ b/src/draw.h
@@ -3,8 +3,10 @@
 
 #include <glib.h>
 #include <pango/pango-font.h>
+#include <pango/pangocairo.h>
 
 #include "window.h"
+#include "button.h"
 
 typedef struct Drawable Drawable;
 
@@ -18,6 +20,14 @@ struct Drawable {
     PangoFontDescription *desc;
 };
 
+typedef struct {
+    Button *btn;
+    int x, y;
+    int width, height;
+    int text_w, text_h;
+    PangoLayout *pl;
+} Layout;
+
 Drawable *draw_create(const char *font, int height, int left_pad, int right_pad, int top_pad, double alpha);
 
 void draw_compute_layout(Drawable *draw, GList *btns, cairo_t *cr);