Implement opacity command

1 files changed, 39 insertions, 0 deletions

diff --git a/sway/commands/opacity.c b/sway/commands/opacity.c
new file mode 100644
index 00000000..b8cd1f09
--- /dev/null
+++ b/sway/commands/opacity.c
@@ -0,0 +1,39 @@
+#include <assert.h>
+#include <stdlib.h>
+#include "sway/commands.h"
+#include "sway/tree/view.h"
+#include "log.h"
+
+static bool parse_opacity(const char *opacity, float *val) {
+        char *err;
+        *val = strtof(opacity, &err);
+        if (*val < 0 || *val > 1 || *err) {
+                return false;
+        }
+        return true;
+}
+
+struct cmd_results *cmd_opacity(int argc, char **argv) {
+        struct cmd_results *error = NULL;
+        if ((error = checkarg(argc, "layout", EXPECTED_EQUAL_TO, 1))) {
+                return error;
+        }
+
+        struct sway_container *con =
+                config->handler_context.current_container;
+
+        float opacity = 0.0f;
+
+        if (!parse_opacity(argv[0], &opacity)) {
+                return cmd_results_new(CMD_INVALID, "opacity <value>",
+                                "Invalid value (expected 0..1): %s", argv[0]);
+        }
+
+        con->alpha = opacity;
+
+        if (con->type == C_VIEW) {
+                view_damage_whole(con->sway_view);
+        }
+
+        return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+}