Tooltip Cleanup

This is prep for tooltip improvement: https://codereview.chromium.org/924433002/ (WIP)

* Consolidated GetMaxWidth
* Eliminate screen type argument. This can be obtained from tooltip window.
* Move tooltip truncate code from TooltipManager to TooltipController

BUG=None
TEST=no functional change. all test should pass.

Review URL: https://codereview.chromium.org/916423002

Cr-Commit-Position: refs/heads/master@{#317081}

14 files changed, 76 insertions, 70 deletions

diff --git a/ui/views/corewm/tooltip.h b/ui/views/corewm/tooltip.h
index 7fb15bc..b8e6803 100644
--- a/ui/views/corewm/tooltip.h
+++ b/ui/views/corewm/tooltip.h
@@ -25,6 +25,10 @@ class VIEWS_EXPORT Tooltip {
  public:
   virtual ~Tooltip() {}
 
+  // Returns the max width of the tooltip when shown at the specified location.
+  virtual int GetMaxWidth(const gfx::Point& location,
+                          aura::Window* context) const = 0;
+
   // Updates the text on the tooltip and resizes to fit.
   virtual void SetText(aura::Window* window,
                        const base::string16& tooltip_text,
diff --git a/ui/views/corewm/tooltip_aura.cc b/ui/views/corewm/tooltip_aura.cc
index ef69bbc..3e98cf16 100644
--- a/ui/views/corewm/tooltip_aura.cc
+++ b/ui/views/corewm/tooltip_aura.cc
@@ -47,9 +47,8 @@ views::Widget* CreateTooltipWidget(aura::Window* tooltip_window) {
 namespace views {
 namespace corewm {
 
-TooltipAura::TooltipAura(gfx::ScreenType screen_type)
-    : screen_type_(screen_type),
-      widget_(NULL),
+TooltipAura::TooltipAura()
+    : widget_(NULL),
       tooltip_window_(NULL) {
   label_.set_owned_by_client();
   label_.SetMultiLine(true);
@@ -142,19 +141,11 @@ void TooltipAura::TrimTooltipToFit(const gfx::FontList& font_list,
   *text = result;
 }
 
-int TooltipAura::GetMaxWidth(const gfx::Point& location) const {
-  // TODO(varunjain): implementation duplicated in tooltip_manager_aura. Figure
-  // out a way to merge.
-  gfx::Screen* screen = gfx::Screen::GetScreenByType(screen_type_);
-  gfx::Rect display_bounds(screen->GetDisplayNearestPoint(location).bounds());
-  return (display_bounds.width() + 1) / 2;
-}
-
 void TooltipAura::SetTooltipBounds(const gfx::Point& mouse_pos,
                                    const gfx::Size& tooltip_size) {
   gfx::Rect tooltip_rect(mouse_pos, tooltip_size);
   tooltip_rect.Offset(kCursorOffsetX, kCursorOffsetY);
-  gfx::Screen* screen = gfx::Screen::GetScreenByType(screen_type_);
+  gfx::Screen* screen = gfx::Screen::GetScreenFor(tooltip_window_);
   gfx::Rect display_bounds(screen->GetDisplayNearestPoint(mouse_pos).bounds());
 
   // If tooltip is out of bounds on the x axis, we simply shift it
@@ -181,6 +172,13 @@ void TooltipAura::DestroyWidget() {
   }
 }
 
+int TooltipAura::GetMaxWidth(const gfx::Point& location,
+                             aura::Window* context) const {
+  gfx::Screen* screen = gfx::Screen::GetScreenFor(context);
+  gfx::Rect display_bounds(screen->GetDisplayNearestPoint(location).bounds());
+  return std::min(kTooltipMaxWidthPixels, (display_bounds.width() + 1) / 2);
+}
+
 void TooltipAura::SetText(aura::Window* window,
                           const base::string16& tooltip_text,
                           const gfx::Point& location) {
@@ -188,8 +186,8 @@ void TooltipAura::SetText(aura::Window* window,
   int max_width = 0;
   int line_count = 0;
   base::string16 trimmed_text(tooltip_text);
-  TrimTooltipToFit(label_.font_list(), GetMaxWidth(location), &trimmed_text,
-                   &max_width, &line_count);
+  TrimTooltipToFit(label_.font_list(), GetMaxWidth(location, window),
+                   &trimmed_text, &max_width, &line_count);
   label_.SetText(trimmed_text);
 
   if (!widget_) {
diff --git a/ui/views/corewm/tooltip_aura.h b/ui/views/corewm/tooltip_aura.h
index 07952b6..ce92fa2 100644
--- a/ui/views/corewm/tooltip_aura.h
+++ b/ui/views/corewm/tooltip_aura.h
@@ -23,7 +23,7 @@ namespace corewm {
 // Implementation of Tooltip that shows the tooltip using a Widget and Label.
 class VIEWS_EXPORT TooltipAura : public Tooltip, public WidgetObserver {
  public:
-  explicit TooltipAura(gfx::ScreenType screen_type);
+  TooltipAura();
   ~TooltipAura() override;
 
   // Trims the tooltip to fit in the width |max_width|, setting |text| to the
@@ -37,9 +37,6 @@ class VIEWS_EXPORT TooltipAura : public Tooltip, public WidgetObserver {
                                int* line_count);
 
  private:
-  // Returns the max width of the tooltip when shown at the specified location.
-  int GetMaxWidth(const gfx::Point& location) const;
-
   // Adjusts the bounds given by the arguments to fit inside the desktop
   // and applies the adjusted bounds to the label_.
   void SetTooltipBounds(const gfx::Point& mouse_pos,
@@ -49,6 +46,8 @@ class VIEWS_EXPORT TooltipAura : public Tooltip, public WidgetObserver {
   void DestroyWidget();
 
   // Tooltip:
+  int GetMaxWidth(const gfx::Point& location,
+                  aura::Window* context) const override;
   void SetText(aura::Window* window,
                const base::string16& tooltip_text,
                const gfx::Point& location) override;
@@ -59,8 +58,6 @@ class VIEWS_EXPORT TooltipAura : public Tooltip, public WidgetObserver {
   // WidgetObserver:
   void OnWidgetDestroying(Widget* widget) override;
 
-  const gfx::ScreenType screen_type_;
-
   // The label showing the tooltip.
   Label label_;
 
diff --git a/ui/views/corewm/tooltip_controller.cc b/ui/views/corewm/tooltip_controller.cc
index 0408f5d..8af7199 100644
--- a/ui/views/corewm/tooltip_controller.cc
+++ b/ui/views/corewm/tooltip_controller.cc
@@ -17,6 +17,7 @@
 #include "ui/gfx/font.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/screen.h"
+#include "ui/gfx/text_elider.h"
 #include "ui/views/corewm/tooltip.h"
 #include "ui/views/widget/tooltip_manager.h"
 #include "ui/wm/public/drag_drop_client.h"
@@ -27,6 +28,7 @@ namespace {
 
 const int kTooltipTimeoutMs = 500;
 const int kDefaultTooltipShownTimeoutMs = 10000;
+const size_t kMaxTooltipLength = 1024;
 
 // Returns true if |target| is a valid window to get the tooltip from.
 // |event_target| is the original target from the event and |target| the window
@@ -129,6 +131,11 @@ TooltipController::~TooltipController() {
     tooltip_window_->RemoveObserver(this);
 }
 
+int TooltipController::GetMaxWidth(const gfx::Point& location,
+                                   gfx::NativeView context) const {
+  return tooltip_->GetMaxWidth(location, context);
+}
+
 void TooltipController::UpdateTooltip(aura::Window* target) {
   // If tooltip is visible, we may want to hide it. If it is not, we are ok.
   if (tooltip_window_ == target && tooltip_->IsVisible())
@@ -298,8 +305,8 @@ void TooltipController::UpdateIfRequired() {
   if (tooltip_text_ != tooltip_text || !tooltip_->IsVisible() || ids_differ) {
     tooltip_shown_timer_.Stop();
     tooltip_text_ = tooltip_text;
-    base::string16 trimmed_text(tooltip_text_);
-    views::TooltipManager::TrimTooltipText(&trimmed_text);
+    base::string16 trimmed_text =
+        gfx::TruncateString(tooltip_text_, kMaxTooltipLength, gfx::WORD_BREAK);
     // If the string consists entirely of whitespace, then don't both showing it
     // (an empty tooltip is useless).
     base::string16 whitespace_removed_text;
diff --git a/ui/views/corewm/tooltip_controller.h b/ui/views/corewm/tooltip_controller.h
index 87500b3..2f8c7ef 100644
--- a/ui/views/corewm/tooltip_controller.h
+++ b/ui/views/corewm/tooltip_controller.h
@@ -38,6 +38,8 @@ class VIEWS_EXPORT TooltipController : public aura::client::TooltipClient,
   ~TooltipController() override;
 
   // Overridden from aura::client::TooltipClient.
+  int GetMaxWidth(const gfx::Point& location,
+                  aura::Window* context) const override;
   void UpdateTooltip(aura::Window* target) override;
   void SetTooltipShownTimeout(aura::Window* target, int timeout_in_ms) override;
   void SetTooltipsEnabled(bool enable) override;
diff --git a/ui/views/corewm/tooltip_controller_unittest.cc b/ui/views/corewm/tooltip_controller_unittest.cc
index 0ce3fb4..ad341d9 100644
--- a/ui/views/corewm/tooltip_controller_unittest.cc
+++ b/ui/views/corewm/tooltip_controller_unittest.cc
@@ -90,7 +90,7 @@ class TooltipControllerTest : public aura::test::AuraTestBase {
 #if defined(OS_CHROMEOS)
     controller_.reset(new TooltipController(
           scoped_ptr<views::corewm::Tooltip>(
-              new views::corewm::TooltipAura(gfx::SCREEN_TYPE_ALTERNATE))));
+              new views::corewm::TooltipAura)));
     root_window()->AddPreTargetHandler(controller_.get());
     SetTooltipClient(root_window(), controller_.get());
 #endif
@@ -532,6 +532,10 @@ class TestTooltip : public Tooltip {
   const base::string16& tooltip_text() const { return tooltip_text_; }
 
   // Tooltip:
+  int GetMaxWidth(const gfx::Point& location,
+                  aura::Window* context) const override {
+    return 100;
+  }
   void SetText(aura::Window* window,
                const base::string16& tooltip_text,
                const gfx::Point& location) override {
diff --git a/ui/views/corewm/tooltip_win.cc b/ui/views/corewm/tooltip_win.cc
index 15d90ac..46635d2 100644
--- a/ui/views/corewm/tooltip_win.cc
+++ b/ui/views/corewm/tooltip_win.cc
@@ -95,6 +95,16 @@ void TooltipWin::PositionTooltip() {
                0, SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
 }
 
+int TooltipWin::GetMaxWidth(const gfx::Point& location,
+                            aura::Window* context) const {
+  // This code only runs for non-metro, so GetNativeScreen() is fine.
+  const gfx::Point screen_point = gfx::win::DIPToScreenPoint(location);
+  gfx::Display display(
+      gfx::Screen::GetNativeScreen()->GetDisplayNearestPoint(screen_point));
+  const gfx::Rect monitor_bounds = display.bounds();
+  return (monitor_bounds.width() + 1) / 2;
+}
+
 void TooltipWin::SetText(aura::Window* window,
                          const base::string16& tooltip_text,
                          const gfx::Point& location) {
@@ -116,12 +126,7 @@ void TooltipWin::SetText(aura::Window* window,
   SendMessage(tooltip_hwnd_, TTM_SETTOOLINFO, 0,
               reinterpret_cast<LPARAM>(&toolinfo_));
 
-  // This code only runs for non-metro, so GetNativeScreen() is fine.
-  const gfx::Point screen_point = gfx::win::DIPToScreenPoint(location_);
-  gfx::Display display(
-      gfx::Screen::GetNativeScreen()->GetDisplayNearestPoint(screen_point));
-  const gfx::Rect monitor_bounds = display.bounds();
-  int max_width = (monitor_bounds.width() + 1) / 2;
+  int max_width = GetMaxWidth(location_, window);
   SendMessage(tooltip_hwnd_, TTM_SETMAXTIPWIDTH, 0, max_width);
 }
 
diff --git a/ui/views/corewm/tooltip_win.h b/ui/views/corewm/tooltip_win.h
index 3f3e51b..9fac064 100644
--- a/ui/views/corewm/tooltip_win.h
+++ b/ui/views/corewm/tooltip_win.h
@@ -22,7 +22,7 @@ namespace corewm {
 class VIEWS_EXPORT TooltipWin : public Tooltip {
  public:
   explicit TooltipWin(HWND parent);
-  virtual ~TooltipWin();
+  ~TooltipWin() override;
 
   // HandleNotify() is forwarded from DesktopWindowTreeHostWin to keep the
   // native tooltip in sync.
@@ -37,12 +37,14 @@ class VIEWS_EXPORT TooltipWin : public Tooltip {
   void PositionTooltip();
 
   // Tooltip:
-  virtual void SetText(aura::Window* window,
-                       const base::string16& tooltip_text,
-                       const gfx::Point& location) override;
-  virtual void Show() override;
-  virtual void Hide() override;
-  virtual bool IsVisible() override;
+  int GetMaxWidth(const gfx::Point& location,
+                  aura::Window* context) const override;
+  void SetText(aura::Window* window,
+               const base::string16& tooltip_text,
+               const gfx::Point& location) override;
+  void Show() override;
+  void Hide() override;
+  bool IsVisible() override;
 
   // The window |tooltip_hwnd_| is parented to.
   HWND parent_hwnd_;
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
index 3874e67..784446e2 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
@@ -289,7 +289,7 @@ void DesktopWindowTreeHostX11::OnNativeWidgetCreated(
 }
 
 scoped_ptr<corewm::Tooltip> DesktopWindowTreeHostX11::CreateTooltip() {
-  return make_scoped_ptr(new corewm::TooltipAura(gfx::SCREEN_TYPE_NATIVE));
+  return make_scoped_ptr(new corewm::TooltipAura);
 }
 
 scoped_ptr<aura::client::DragDropClient>
diff --git a/ui/views/widget/tooltip_manager.cc b/ui/views/widget/tooltip_manager.cc
index b2e6827..c5e641a 100644
--- a/ui/views/widget/tooltip_manager.cc
+++ b/ui/views/widget/tooltip_manager.cc
@@ -4,33 +4,9 @@
 
 #include "ui/views/widget/tooltip_manager.h"
 
-#include "ui/gfx/geometry/rect.h"
-#include "ui/gfx/screen.h"
-#include "ui/gfx/text_elider.h"
-
 namespace views {
 
-const size_t kMaxTooltipLength = 1024;
-
 // static
 const char TooltipManager::kGroupingPropertyKey[] = "GroupingPropertyKey";
 
-// static
-int TooltipManager::GetMaxWidth(int x, int y, gfx::NativeView context) {
-  return GetMaxWidth(gfx::Screen::GetScreenFor(context)->GetDisplayNearestPoint(
-                         gfx::Point(x, y)));
-}
-
-// static
-int TooltipManager::GetMaxWidth(const gfx::Display& display) {
-  return (display.bounds().width() + 1) / 2;
-}
-
-// static
-void TooltipManager::TrimTooltipText(base::string16* text) {
-  // Clamp the tooltip length to kMaxTooltipLength so that we don't
-  // accidentally DOS the user with a mega tooltip.
-  *text = gfx::TruncateString(*text, kMaxTooltipLength, gfx::WORD_BREAK);
-}
-
 }  // namespace views
diff --git a/ui/views/widget/tooltip_manager.h b/ui/views/widget/tooltip_manager.h
index 828d4f4..4145db4 100644
--- a/ui/views/widget/tooltip_manager.h
+++ b/ui/views/widget/tooltip_manager.h
@@ -15,6 +15,7 @@
 namespace gfx {
 class Display;
 class FontList;
+class Point;
 }  // namespace gfx
 
 namespace views {
@@ -38,17 +39,11 @@ class VIEWS_EXPORT TooltipManager {
   TooltipManager() {}
   virtual ~TooltipManager() {}
 
-  // Returns the maximum width of the tooltip. |x| and |y| give the location
+  // Returns the maximum width of the tooltip. |point| gives the location
   // the tooltip is to be displayed on in screen coordinates. |context| is
   // used to determine which gfx::Screen should be used.
-  static int GetMaxWidth(int x, int y, gfx::NativeView context);
-
-  // Same as GetMaxWidth(), but takes a Display.
-  static int GetMaxWidth(const gfx::Display& display);
-
-  // If necessary trims the text of a tooltip to ensure we don't try to display
-  // a mega-tooltip.
-  static void TrimTooltipText(base::string16* text);
+  virtual int GetMaxWidth(const gfx::Point& location,
+                          gfx::NativeView context) const = 0;
 
   // Returns the font list used for tooltips.
   virtual const gfx::FontList& GetFontList() const = 0;
diff --git a/ui/views/widget/tooltip_manager_aura.cc b/ui/views/widget/tooltip_manager_aura.cc
index bb4ead6..8f22401 100644
--- a/ui/views/widget/tooltip_manager_aura.cc
+++ b/ui/views/widget/tooltip_manager_aura.cc
@@ -81,6 +81,12 @@ const gfx::FontList& TooltipManagerAura::GetFontList() const {
   return GetDefaultFontList();
 }
 
+int TooltipManagerAura::GetMaxWidth(const gfx::Point& point,
+                                    aura::Window* context) const {
+  return aura::client::GetTooltipClient(context->GetRootWindow())->
+      GetMaxWidth(point, context);
+}
+
 void TooltipManagerAura::UpdateTooltip() {
   aura::Window* root_window = GetWindow()->GetRootWindow();
   if (aura::client::GetTooltipClient(root_window)) {
diff --git a/ui/views/widget/tooltip_manager_aura.h b/ui/views/widget/tooltip_manager_aura.h
index a7ac414..87c0f4e 100644
--- a/ui/views/widget/tooltip_manager_aura.h
+++ b/ui/views/widget/tooltip_manager_aura.h
@@ -38,6 +38,8 @@ class TooltipManagerAura : public TooltipManager {
   static const gfx::FontList& GetDefaultFontList();
 
   // TooltipManager:
+  int GetMaxWidth(const gfx::Point& location,
+                  aura::Window* context) const override;
   const gfx::FontList& GetFontList() const override;
   void UpdateTooltip() override;
   void TooltipTextChanged(View* view) override;
diff --git a/ui/wm/public/tooltip_client.h b/ui/wm/public/tooltip_client.h
index f2b97cd..f58a63e 100644
--- a/ui/wm/public/tooltip_client.h
+++ b/ui/wm/public/tooltip_client.h
@@ -8,6 +8,10 @@
 #include "ui/aura/aura_export.h"
 #include "ui/gfx/font.h"
 
+namespace gfx {
+class Point;
+}
+
 namespace aura {
 class Window;
 namespace client {
@@ -16,6 +20,10 @@ class ScopedTooltipDisabler;
 
 class AURA_EXPORT TooltipClient {
  public:
+  // Returns the max width of the tooltip when shown at the specified location.
+  virtual int GetMaxWidth(const gfx::Point& point,
+                          aura::Window* context) const = 0;
+
   // Informs the shell tooltip manager of change in tooltip for window |target|.
   virtual void UpdateTooltip(Window* target) = 0;