MacViews: Implement Tab Dragging

chrome/test/base/interactive_test_utils_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/test/base/interactive_test_utils.h"
 
 #include <Carbon/Carbon.h>
 #import <Cocoa/Cocoa.h>
 
-#include "base/message_loop/message_loop.h"
 #include "chrome/app/chrome_command_ids.h"
 #import "ui/base/test/windowed_nsnotification_observer.h"
+#include "ui/gfx/animation/tween.h"
 
 namespace ui_test_utils {
 
+namespace {
+
+// Runs a list of drag and drop |operations| on a single RunLoop.
+//
+// We need to execute drag and drop operations as a batch, so the nested
+// RunMoveLoop()'s RunLoop is cancelled before the top-level one from which we
+// post the simulated events, otherwise we'll deadlock.
+class OperationRunner {
+ public:
+  static void Run(const std::list<DragAndDropOperation>& operations) {
+    OperationRunner runner(operations);
+    base::RunLoop run_loop;
+    runner.quit_closure_ = run_loop.QuitClosure();
+    base::MessageLoop::current()->PostTask(
+        FROM_HERE,
+        base::Bind(&OperationRunner::Next, base::Unretained(&runner)));
+    run_loop.Run();
+  }
+
+ private:
+  explicit OperationRunner(const std::list<DragAndDropOperation>& operations)
+      : operations_(operations) {}
+
+  void Next() {
+    if (operations_.empty()) {
+      base::MessageLoop::current()->PostTask(FROM_HERE, quit_closure_);
+      return;
+    }
+
+    const DragAndDropOperation op = operations_.front();
+    operations_.pop_front();
+    auto next = base::Bind(&OperationRunner::Next, base::Unretained(this));
+    switch (op.type()) {
+      case DragAndDropOperation::Type::Move:
+        ui_controls::SendMouseMoveNotifyWhenDone(op.point().x(), op.point().y(),
+                                                 next);
+        break;
+
+      case DragAndDropOperation::Type::MouseDown:
+        ui_controls::SendMouseEventsNotifyWhenDone(ui_controls::LEFT,
+                                                   ui_controls::DOWN, next);
+        break;
+
+      case DragAndDropOperation::Type::MouseUp:
+        ui_controls::SendMouseEventsNotifyWhenDone(ui_controls::LEFT,
+                                                   ui_controls::UP, next);
+        break;
+    }
+  }
+
+  ~OperationRunner() { DCHECK(operations_.empty()); }
+
+  base::Closure quit_closure_;
+  std::list<DragAndDropOperation> operations_;
+
+  DISALLOW_COPY_AND_ASSIGN(OperationRunner);
+};
+
+}  // namespace
+
+void DragAndDropSequence(const std::list<DragAndDropOperation>& operations) {
+  OperationRunner::Run(operations);
+}
+
+void DragAndDrop(const gfx::Point& from, const gfx::Point& to, int steps) {
+  DCHECK_GE(steps, 1);
+  std::list<DragAndDropOperation> operations;
+  operations.push_back(DragAndDropOperation::Move(from));
+  operations.push_back(DragAndDropOperation::MouseDown());
+
+  for (int i = 1; i <= steps; ++i) {
+    const double progress = static_cast<double>(i) / steps;
+    operations.push_back(DragAndDropOperation::Move(
+        gfx::Point(gfx::Tween::IntValueBetween(progress, from.x(), to.x()),
+                   gfx::Tween::IntValueBetween(progress, from.y(), to.y()))));
+  }
+
+  operations.push_back(DragAndDropOperation::MouseUp());
+  DragAndDropSequence(operations);
+}
+
 void HideNativeWindow(gfx::NativeWindow window) {
   [window orderOut:nil];
 }
 
 bool ShowAndFocusNativeWindow(gfx::NativeWindow window) {
   // Make sure an unbundled program can get the input focus.
   ProcessSerialNumber psn = { 0, kCurrentProcess };
   TransformProcessType(&psn,kProcessTransformToForegroundApplication);
   SetFrontProcess(&psn);
 
@@ skipping 11 matching lines @@
   // This is because normal AppKit menu updating does not get invoked when
   // events are sent via ui_test_utils::SendKeyPressSync.
   BOOL notification_observed = [async_waiter wait];
   base::RunLoop().RunUntilIdle();  // There may be other events queued. Flush.
   NSMenu* file_menu = [[[NSApp mainMenu] itemWithTag:IDC_FILE_MENU] submenu];
   [[file_menu delegate] menuNeedsUpdate:file_menu];
 
   return !async_waiter || notification_observed;
 }
 
+// static
+DragAndDropOperation DragAndDropOperation::Move(const gfx::Point& p) {

[tapted, 2016/06/06 07:12:36]

nit (per previous comment) This should move up as well, to come before 
DragAndDropSequence

[themblsha, 2016/06/06 17:20:27]

Whoops, sorry.

+  return DragAndDropOperation(Type::Move, p);
+}
+
+// static
+DragAndDropOperation DragAndDropOperation::MouseDown() {
+  return DragAndDropOperation(Type::MouseDown, gfx::Point());
+}
+
+// static
+DragAndDropOperation DragAndDropOperation::MouseUp() {
+  return DragAndDropOperation(Type::MouseUp, gfx::Point());
+}
+
 }  // namespace ui_test_utils