ui: Add multi-step EventGenerator::MoveMouseBy/MoveTouch*

Add multi-step EventGenerator::MoveMouseBy/MoveTouch* that
generates multiple events to get to target location.
Multi-step `MoveMouseBy` will be used by a test in a follow-up CL.

Update callers to bind lamda instead of directly binding
`MoveMouseBy` since it is ambiguous now.

Bug: None
Change-Id: I808d572541dd5777cc2db1631969098b62613829
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6442199
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1444863}

ash/drag_drop/drag_drop_controller_unittest.cc

@@ -1312,16 +1312,16 @@ TEST_F(DragDropControllerTest, EventTarget) {
   generator.PressLeftButton();
   // For drag enter
   base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
-      FROM_HERE, base::BindOnce(&ui::test::EventGenerator::MoveMouseBy,
-                                base::Unretained(&generator), 0, 1));
+      FROM_HERE,
+      base::BindLambdaForTesting([&]() { generator.MoveMouseBy(0, 1); }));
   // For drag update
   base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
-      FROM_HERE, base::BindOnce(&ui::test::EventGenerator::MoveMouseBy,
-                                base::Unretained(&generator), 0, 1));
+      FROM_HERE,
+      base::BindLambdaForTesting([&]() { generator.MoveMouseBy(0, 1); }));
   // For perform drop
   base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
-      FROM_HERE, base::BindOnce(&ui::test::EventGenerator::ReleaseLeftButton,
-                                base::Unretained(&generator)));
+      FROM_HERE,
+      base::BindLambdaForTesting([&]() { generator.ReleaseLeftButton(); }));
 
   drag_drop_controller_->set_should_block_during_drag_drop(true);
   auto data = CreateDragData(/*with_image=*/false);
@@ -1352,12 +1352,12 @@ TEST_F(DragDropControllerTest, DragTabChangesDragOperationToMove) {
   generator.PressLeftButton();
   // For drag enter.
   base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
-      FROM_HERE, base::BindOnce(&ui::test::EventGenerator::MoveMouseBy,
-                                base::Unretained(&generator), 0, 1));
+      FROM_HERE,
+      base::BindLambdaForTesting([&]() { generator.MoveMouseBy(0, 1); }));
   // For perform drop.
   base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
-      FROM_HERE, base::BindOnce(&ui::test::EventGenerator::ReleaseLeftButton,
-                                base::Unretained(&generator)));
+      FROM_HERE,
+      base::BindLambdaForTesting([&]() { generator.ReleaseLeftButton(); }));
 
   drag_drop_controller_->set_should_block_during_drag_drop(true);
   DragOperation operation = drag_drop_controller_->StartDragAndDrop(

ash/shelf/shelf_layout_manager_unittest.cc

@@ -81,6 +81,7 @@
 #include "base/i18n/rtl.h"
 #include "base/memory/raw_ptr.h"
 #include "base/run_loop.h"
+#include "base/test/bind.h"
 #include "base/test/icu_test_util.h"
 #include "base/test/metrics/histogram_tester.h"
 #include "base/test/metrics/user_action_tester.h"
@@ -2966,14 +2967,10 @@ class ShelfLayoutManagerDragDropTest
 
   // Drags a view vertically by `dy` pixels. Assumes the drag has been started.
   void MoveDragBy(int dy) {
-    auto move_fn =
-        base::BindRepeating(GetParam() == DragEventType::kMouse
-                                ? &ui::test::EventGenerator::MoveMouseBy
-                                : &ui::test::EventGenerator::MoveTouchBy,
-                            base::Unretained(generator_));
-    const int step = dy / abs(dy);
-    for (int i = 0; i < abs(dy); ++i) {
-      move_fn.Run(0, step);
+    if (GetParam() == DragEventType::kMouse) {
+      generator_->MoveMouseBy(0, dy, /*count=*/abs(dy));
+    } else {
+      generator_->MoveTouchBy(0, dy, /*count=*/abs(dy));
     }
   }
 

ui/events/test/event_generator.cc

@@ -341,19 +341,42 @@ void EventGenerator::PressTouchId(
   Dispatch(&touchev);
 }
 
-void EventGenerator::MoveTouch(const gfx::Point& point) {
-  MoveTouchId(point, 0);
+void EventGenerator::MoveTouch(const gfx::Point& point, int count) {
+  MoveTouchId(point, 0, count);
 }
 
-void EventGenerator::MoveTouchId(const gfx::Point& point, int touch_id) {
-  SetCurrentScreenLocation(point);
-  ui::TouchEvent touchev = CreateTestTouchEvent(
-      ui::EventType::kTouchMoved, GetLocationInCurrentRoot(), touch_id, flags_,
-      ui::EventTimeForNow());
-  Dispatch(&touchev);
+void EventGenerator::MoveTouchId(const gfx::Point& point,
+                                 int touch_id,
+                                 int count) {
+  // Tracks the location of last `SetCurrentScreenLocation` in the loop.
+  gfx::Point expected_current_location = current_screen_location_;
 
-  if (!grab_)
-    UpdateCurrentDispatcher(point);
+  const gfx::Point start_point = current_screen_location_;
+  const gfx::Vector2dF diff(point - start_point);
+  for (float i = 1; i <= count; i++) {
+    gfx::Vector2dF step(diff);
+    step.Scale(i / count);
+    gfx::Point move_point = start_point + gfx::ToRoundedVector2d(step);
+    if (!grab_) {
+      UpdateCurrentDispatcher(move_point);
+    }
+
+    // Changing `current_screen_location_` in nested `MoveTouchId` under
+    // `Dispatch` is not supported.
+    CHECK_EQ(expected_current_location, current_screen_location_);
+
+    // Update current location before dispatching because some tests (e.g.
+    // apps grid view dragging related) calculate the next touch position
+    // during the dispatch.
+    SetCurrentScreenLocation(move_point);
+    expected_current_location = move_point;
+
+    delegate()->ConvertPointToTarget(current_target_, &move_point);
+    ui::TouchEvent touchev =
+        CreateTestTouchEvent(ui::EventType::kTouchMoved, move_point, touch_id,
+                             flags_, ui::EventTimeForNow());
+    Dispatch(&touchev);
+  }
 }
 
 void EventGenerator::ReleaseTouch() {

ui/events/test/event_generator.h

@@ -257,8 +257,9 @@ class EventGenerator {
     MoveMouseRelativeTo(window, gfx::Point(x, y));
   }
 
-  void MoveMouseBy(int x, int y) {
-    MoveMouseTo(current_screen_location_ + gfx::Vector2d(x, y));
+  void MoveMouseBy(int x, int y) { MoveMouseBy(x, y, /*count=*/1); }
+  void MoveMouseBy(int x, int y, int count) {
+    MoveMouseTo(current_screen_location_ + gfx::Vector2d(x, y), count);
   }
 
   // Generates events to drag mouse to given |point|.
@@ -312,22 +313,31 @@ class EventGenerator {
       int touch_id,
       const std::optional<gfx::Point>& touch_location_in_screen = std::nullopt);
 
-  // Generates a EventType::kTouchMoved event to |point|.
-  void MoveTouch(const gfx::Point& point);
+  // Generates EventType::kTouchMoved events to |point|.
+  void MoveTouch(const gfx::Point& point, int count);
+  void MoveTouch(const gfx::Point& point) { MoveTouch(point, /*count=*/1); }
 
-  // Generates a EventType::kTouchMoved event moving by (x, y) from current
+  // Generates EventType::kTouchMoved events moving by (x, y) from current
   // location.
-  void MoveTouchBy(int x, int y) {
-    MoveTouch(current_screen_location_ + gfx::Vector2d(x, y));
+  void MoveTouchBy(int x, int y, int count) {
+    MoveTouch(current_screen_location_ + gfx::Vector2d(x, y), count);
   }
+  void MoveTouchBy(int x, int y) { MoveTouchBy(x, y, /*count=*/1); }
 
-  // Generates a EventType::kTouchMoved event to |point| with |touch_id|.
-  void MoveTouchId(const gfx::Point& point, int touch_id);
+  // Generates EventType::kTouchMoved events to |point| with |touch_id|.
+  void MoveTouchId(const gfx::Point& point, int touch_id, int count);
+  void MoveTouchId(const gfx::Point& point, int touch_id) {
+    MoveTouchId(point, touch_id, /*count=*/1);
+  }
 
   // Generates a EventType::kTouchMoved event moving (x, y) from current
   // location with |touch_id|.
+  void MoveTouchIdBy(int touch_id, int x, int y, int count) {
+    MoveTouchId(current_screen_location_ + gfx::Vector2d(x, y), touch_id,
+                count);
+  }
   void MoveTouchIdBy(int touch_id, int x, int y) {
-    MoveTouchId(current_screen_location_ + gfx::Vector2d(x, y), touch_id);
+    MoveTouchIdBy(touch_id, x, y, /*count=*/1);
   }
 
   // Generates a touch release event.