SetDeviceScaleFactorForTest

ui/views/widget/desktop_aura/desktop_screen_unittest.cc

+// Copyright 2016 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 "ui/views/widget/desktop_aura/desktop_screen.h"
+
+#include "ui/aura/window.h"
+#include "ui/compositor/layer.h"
+#include "ui/compositor/layer_delegate.h"
+#include "ui/display/screen.h"
+#include "ui/views/test/views_test_base.h"
+#include "ui/views/widget/desktop_aura/desktop_native_widget_aura.h"
+#include "ui/views/widget/widget.h"
+
+namespace views {
+
+class DesktopScreenTest : public ViewsTestBase {
+ public:
+  DesktopScreenTest() {}
+  ~DesktopScreenTest() override {}
+
+  // VIewsTestBase::
+  void SetUp() override {
+    display::Screen::SetScreenInstance(views::CreateDesktopScreen());
+    ViewsTestBase::SetUp();
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DesktopScreenTest);
+};
+
+namespace {
+class TestLayerDelegate : public ui::LayerDelegate {
+ public:
+  TestLayerDelegate() {}
+  ~TestLayerDelegate() override {}
+
+  // ui::LayerDelegate:
+  void OnPaintLayer(const ui::PaintContext& context) override {}
+  void OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) override {}
+  void OnDeviceScaleFactorChanged(float device_scale_factor) override {
+    changed_device_scale_factor_ = device_scale_factor;
+  }
+  base::Closure PrepareForLayerBoundsChange() override {
+    return base::Closure();
+  }
+
+  float changed_device_scale_factor() const {
+    return changed_device_scale_factor_;
+  }
+
+ private:
+  float changed_device_scale_factor_ = 0.0;
+  DISALLOW_COPY_AND_ASSIGN(TestLayerDelegate);
+};
+
+}  // namespace
+
+TEST_F(DesktopScreenTest, SetDeviceScaleFactorForTest) {
+  Widget widget;
+  Widget::InitParams params = CreateParams(Widget::InitParams::TYPE_WINDOW);
+  params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
+  params.native_widget = new DesktopNativeWidgetAura(&widget);
+  params.bounds = gfx::Rect(200, 100);
+  widget.Init(params);
+  widget.Show();
+  ui::Layer* widget_layer = widget.GetNativeWindow()->layer();
+  EXPECT_EQ(1.0f, widget_layer->GetCompositor()->device_scale_factor());
+
+  TestLayerDelegate delegate;
+  ui::Layer layer;
+  layer.set_delegate(&delegate);
+  widget_layer->Add(&layer);
+
+  display::Screen::GetScreen()->SetDeviceScaleFactorForTest(2.0);
+  EXPECT_EQ(2.0f, widget_layer->GetCompositor()->device_scale_factor());
+  EXPECT_EQ(2.0f, delegate.changed_device_scale_factor());
+}
+
+}  // namespace views