GTK: First cut at tab dragging automation....

chrome/browser/automation/automation_provider_gtk.cc

Index: chrome/browser/automation/automation_provider_gtk.cc
===================================================================
--- chrome/browser/automation/automation_provider_gtk.cc	(revision 26890)
+++ chrome/browser/automation/automation_provider_gtk.cc	(working copy)
@@ -4,8 +4,11 @@
 
 #include "chrome/browser/automation/automation_provider.h"
 
+#include <gtk/gtk.h>
+
 #include "base/gfx/point.h"
 #include "base/gfx/rect.h"
+#include "chrome/browser/automation/ui_controls.h"
 #include "chrome/browser/gtk/browser_window_gtk.h"
 #include "chrome/browser/gtk/view_id_util.h"
 #include "chrome/common/gtk_util.h"
@@ -94,14 +97,123 @@
   NOTIMPLEMENTED();
 }
 
+// This task sends a WindowDragResponse message with the appropriate
+// routing ID to the automation proxy.  This is implemented as a task so that
+// we know that the mouse events (and any tasks that they spawn on the message
+// loop) have been processed by the time this is sent.
+class WindowDragResponseTask : public Task {
+ public:
+  WindowDragResponseTask(AutomationProvider* provider,
+                         IPC::Message* reply_message)
+      : provider_(provider),
+        reply_message_(reply_message) {
+    DCHECK(reply_message_);
+    DCHECK(provider);

[Paweł Hajdan Jr., 2009/09/24 18:04:58]

very-small-nit: Please be consistent and check things in the same order as they
come to the function and are initialized, and either check both member
variables, or both parameters. Currently it's mixed (reply_message_ - member and
provider - parameter).

+  }
+
+  virtual ~WindowDragResponseTask() {
+  }
+
+  virtual void Run() {
+    AutomationMsg_WindowDrag::WriteReplyParams(reply_message_, true);
+    provider_->Send(reply_message_);
+  }
+
+ private:
+  AutomationProvider* provider_;
+  IPC::Message* reply_message_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowDragResponseTask);
+};
+
+// A task that just runs a SendMouseEvent and performs another task when done.
+class MouseEventTask : public Task {
+ public:
+  MouseEventTask(Task* next_task, ui_controls::MouseButtonState state)
+      : next_task_(next_task),
+        state_(state) {}
+
+  virtual ~MouseEventTask() {
+  }
+
+  virtual void Run() {
+    ui_controls::SendMouseEventsNotifyWhenDone(ui_controls::LEFT, state_,
+                                               next_task_);
+  }
+
+ private:
+  // The task to execute when we are done.
+  Task* next_task_;
+
+  // Mouse press or mouse release.
+  ui_controls::MouseButtonState state_;
+
+  DISALLOW_COPY_AND_ASSIGN(MouseEventTask);
+};
+
+// A task that just runs a SendMouseMove and performs another task when done.
+class MouseMoveTask : public Task {
+ public:
+  MouseMoveTask(Task* next_task, int absolute_x, int absolute_y)
+      : next_task_(next_task),
+        x_(absolute_x),
+        y_(absolute_y) {
+  }
+
+  virtual ~MouseMoveTask() {
+  }
+
+  virtual void Run() {
+    ui_controls::SendMouseMoveNotifyWhenDone(x_, y_, next_task_);
+  }
+
+ private:
+  // The task to execute when we are done.
+  Task* next_task_;
+
+  // Coordinates of the press.
+  int x_;
+  int y_;
+
+  DISALLOW_COPY_AND_ASSIGN(MouseMoveTask);
+};
+
 void AutomationProvider::WindowSimulateDrag(int handle,
                                             std::vector<gfx::Point> drag_path,
                                             int flags,
                                             bool press_escape_en_route,
                                             IPC::Message* reply_message) {
-  NOTIMPLEMENTED();
-  AutomationMsg_WindowDrag::WriteReplyParams(reply_message, false);
-  Send(reply_message);
+  // TODO(estade): don't ignore |flags| or |escape_en_route|.
+  gfx::NativeWindow window =
+      browser_tracker_->GetResource(handle)->window()->GetNativeHandle();
+  if (window && (drag_path.size() > 1)) {
+    int x, y;
+    gdk_window_get_position(GTK_WIDGET(window)->window, &x, &y);
+
+    // Create a nested stack of tasks to run.
+    Task* next_task = new WindowDragResponseTask(this, reply_message);
+    next_task = new MouseEventTask(next_task, ui_controls::UP);
+    next_task = new MouseEventTask(next_task, ui_controls::UP);
+    for (size_t i = drag_path.size() - 1; i > 0; --i) {
+      // Smooth out the mouse movements by adding intermediate points. This
+      // better simulates a real user drag.
+      int dest_x = drag_path[i].x() + x;
+      int dest_y = drag_path[i].y() + y;
+      int half_step_x = (dest_x + drag_path[i - 1].x() + x) / 2;
+      int half_step_y = (dest_y + drag_path[i - 1].y() + y) / 2;
+
+      next_task = new MouseMoveTask(next_task, dest_x, dest_y);
+      next_task = new MouseMoveTask(next_task, half_step_x, half_step_y);
+    }
+    next_task = new MouseEventTask(next_task, ui_controls::DOWN);
+
+    ui_controls::SendMouseMoveNotifyWhenDone(x + drag_path[0].x(),
+                                             y + drag_path[0].y(),
+                                             next_task);
+  } else {
+    AutomationMsg_WindowDrag::WriteReplyParams(reply_message, false);
+    Send(reply_message);
+  }
 }
 
 void AutomationProvider::TerminateSession(int handle, bool* success) {