views: Add optional overlay image to ImageButton

ui/views/controls/button/image_button_unittest.cc

+// 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 "testing/gtest/include/gtest/gtest.h"
+#include "ui/views/controls/button/image_button.h"
+#include "ui/views/test/views_test_base.h"
+
+namespace {
+
+SkBitmap CreateTestBitmap(int width, int height) {
+  SkBitmap bitmap;
+  bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
+  bitmap.allocPixels();
+  return bitmap;
+}
+
+}  // namespace
+
+namespace views {
+
+typedef ViewsTestBase ImageButtonTest;
+
+TEST_F(ImageButtonTest, Basics) {
+  ImageButton button(NULL);
+
+  // Our image to paint starts empty.
+  EXPECT_TRUE(button.GetImageToPaint().empty());
+
+  // Without a theme, buttons are 16x14 by default.
+  EXPECT_EQ("16x14", button.GetPreferredSize().ToString());
+
+  // We can set a preferred size when we have no image.
+  button.SetPreferredSize(gfx::Size(5, 15));
+  EXPECT_EQ("5x15", button.GetPreferredSize().ToString());
+
+  // Set a normal image.
+  SkBitmap normal_bitmap = CreateTestBitmap(10, 20);
+  button.SetImage(CustomButton::BS_NORMAL, &normal_bitmap);
+
+  // Image uses normal image for painting.
+  EXPECT_FALSE(button.GetImageToPaint().empty());
+  EXPECT_EQ(10, button.GetImageToPaint().width());
+  EXPECT_EQ(20, button.GetImageToPaint().height());
+
+  // Preferred size is the normal button size.
+  EXPECT_EQ("10x20", button.GetPreferredSize().ToString());
+
+  // Set a pushed image.
+  SkBitmap pushed_bitmap = CreateTestBitmap(11, 21);
+  button.SetImage(CustomButton::BS_PUSHED, &pushed_bitmap);
+
+  // By convention, preferred size doesn't change, even though pushed image
+  // is bigger.
+  EXPECT_EQ("10x20", button.GetPreferredSize().ToString());
+
+  // We're still painting the normal image.
+  EXPECT_FALSE(button.GetImageToPaint().empty());
+  EXPECT_EQ(10, button.GetImageToPaint().width());
+  EXPECT_EQ(20, button.GetImageToPaint().height());
+
+  // Set an overlay bitmap.
+  SkBitmap overlay_bitmap = CreateTestBitmap(12, 22);
+  button.SetOverlayImage(&overlay_bitmap);
+  EXPECT_EQ(12, button.overlay_image_.width());
+  EXPECT_EQ(22, button.overlay_image_.height());
+
+  // By convention, preferred size doesn't change, even though pushed image
+  // is bigger.
+  EXPECT_EQ("10x20", button.GetPreferredSize().ToString());
+
+  // We're still painting the normal image.
+  EXPECT_FALSE(button.GetImageToPaint().empty());
+  EXPECT_EQ(10, button.GetImageToPaint().width());
+  EXPECT_EQ(20, button.GetImageToPaint().height());
+
+  // Reset the overlay bitmap.
+  button.SetOverlayImage(NULL);
+  EXPECT_TRUE(button.overlay_image_.empty());
+}
+
+}  // namespace views