ui/views/corewm/tooltip_win.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_VIEWS_COREWM_TOOLTIP_WIN_H_
   6 #define UI_VIEWS_COREWM_TOOLTIP_WIN_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/strings/string16.h"
  11 #include "ui/gfx/geometry/point.h"
  12 #include "ui/views/corewm/tooltip.h"
  13
  14 #include <windows.h>
  15 #include <commctrl.h>
  16
  17 namespace views {
  18 namespace corewm {
  19
  20 // Implementation of Tooltip that uses the native win32 control for showing the
  21 // tooltip.
  22 class VIEWS_EXPORT TooltipWin : public Tooltip {
  23  public:
  24   explicit TooltipWin(HWND parent);
  25   ~TooltipWin() override;
  26
  27   // HandleNotify() is forwarded from DesktopWindowTreeHostWin to keep the
  28   // native tooltip in sync.
  29   bool HandleNotify(int w_param, NMHDR* l_param, LRESULT* l_result);
  30
  31  private:
  32   // Ensures |tooltip_hwnd_| is valid. Returns true if valid, false if there
  33   // a problem creating |tooltip_hwnd_|.
  34   bool EnsureTooltipWindow();
  35
  36   // Sets the position of the tooltip.
  37   void PositionTooltip();
  38
  39   // Tooltip:
  40   int GetMaxWidth(const gfx::Point& location,
  41                   aura::Window* context) const override;
  42   void SetText(aura::Window* window,
  43                const base::string16& tooltip_text,
  44                const gfx::Point& location) override;
  45   void Show() override;
  46   void Hide() override;
  47   bool IsVisible() override;
  48
  49   // The window |tooltip_hwnd_| is parented to.
  50   HWND parent_hwnd_;
  51
  52   // Shows the tooltip.
  53   HWND tooltip_hwnd_;
  54
  55   // Used to modify the tooltip.
  56   TOOLINFO toolinfo_;
  57
  58   // Is the tooltip showing?
  59   bool showing_;
  60
  61   // Location to show the tooltip at. In order to position the tooltip we need
  62   // to know the size. The size is only available from TTN_SHOW, so we have to
  63   // cache it.
  64   gfx::Point location_;
  65
  66   DISALLOW_COPY_AND_ASSIGN(TooltipWin);
  67 };
  68
  69 }  // namespace corewm
  70 }  // namespace views
  71
  72 #endif  // UI_VIEWS_COREWM_TOOLTIP_WIN_H_