device: add PlayOne() for single event replaying

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Chase Douglas <chase.douglas@canonical.com>
Signed-off-by: Chase Douglas <chase.douglas@canonical.com>

2 files changed, 33 insertions, 0 deletions

diff --git a/include/xorg/gtest/evemu/xorg-gtest-device.h b/include/xorg/gtest/evemu/xorg-gtest-device.h
index e4b3c4e..35e5459 100644
--- a/include/xorg/gtest/evemu/xorg-gtest-device.h
+++ b/include/xorg/gtest/evemu/xorg-gtest-device.h
@@ -76,6 +76,20 @@ class Device {
   void Play(const std::string& path) const;
 
   /**
+   * Play a single event through the device.
+   *
+   * Plays an event with the given type, code and value through the device.
+   *
+   * @param [in] type Evdev interface event type, e.g. EV_ABS, EV_REL, EV_KEY.
+   * @param [in] code Evdev interface event code, e.g. ABS_X, REL_Y, BTN_LEFT
+   * @param [in] value Event value
+   * @param [in] sync If true, submit an EV_SYN event after this event
+   *
+   * @throws std::runtime_error if playback failed for any reason.
+   */
+  void PlayOne(int type, int code, int value, bool sync = false);
+
+  /**
    * Return the /dev/input/eventX device node for this device.
    *
    * Note that evemu doesn't know the device node, so we traverse the file
diff --git a/src/device.cpp b/src/device.cpp
index 0f1cef7..1f1c94b 100644
--- a/src/device.cpp
+++ b/src/device.cpp
@@ -27,6 +27,7 @@
 
 #include "xorg/gtest/evemu/xorg-gtest-device.h"
 
+#include <linux/input.h>
 #include <fcntl.h>
 #include <dirent.h>
 
@@ -149,6 +150,24 @@ void xorg::testing::evemu::Device::Play(const std::string& path) const {
   fclose(file);
 }
 
+void xorg::testing::evemu::Device::PlayOne(int type, int code, int value, bool sync)
+{
+  struct input_event ev;
+  if (evemu_create_event(&ev, type, code, value))
+    throw std::runtime_error("Failed to create event");
+
+  if (evemu_play_one(d_->fd, &ev))
+    throw std::runtime_error("Failed to play event");
+
+  if (sync) {
+    if (evemu_create_event(&ev, EV_SYN, SYN_REPORT, 0))
+      throw std::runtime_error("Failed to create EV_SYN event");
+
+    if (evemu_play_one(d_->fd, &ev))
+      throw std::runtime_error("Failed to play EV_SYN event");
+  }
+}
+
 const std::string& xorg::testing::evemu::Device::GetDeviceNode(void) {
   return d_->device_node;
 }