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/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   virtual ~TooltipWin();
  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   virtual void SetText(aura::Window* window,
  41                        const base::string16& tooltip_text,
  42                        const gfx::Point& location) OVERRIDE;
  43   virtual void Show() OVERRIDE;
  44   virtual void Hide() OVERRIDE;
  45   virtual bool IsVisible() OVERRIDE;
  46
  47   // The window |tooltip_hwnd_| is parented to.
  48   HWND parent_hwnd_;
  49
  50   // Shows the tooltip.
  51   HWND tooltip_hwnd_;
  52
  53   // Used to modify the tooltip.
  54   TOOLINFO toolinfo_;
  55
  56   // Is the tooltip showing?
  57   bool showing_;
  58
  59   // Location to show the tooltip at. In order to position the tooltip we need
  60   // to know the size. The size is only available from TTN_SHOW, so we have to
  61   // cache it.
  62   gfx::Point location_;
  63
  64   DISALLOW_COPY_AND_ASSIGN(TooltipWin);
  65 };
  66
  67 }  // namespace corewm
  68 }  // namespace views
  69
  70 #endif  // UI_VIEWS_COREWM_TOOLTIP_WIN_H_