ui/base/touch/touch_device_win.cc

   1 // Copyright (c) 2012 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 #include "ui/base/touch/touch_device.h"
   6 #include "base/logging.h"
   7 #include "base/win/windows_version.h"
   8 #include <windows.h>
   9
  10 namespace ui {
  11
  12 bool IsTouchDevicePresent() {
  13   int value = GetSystemMetrics(SM_DIGITIZER);
  14   return (value & NID_READY) &&
  15       ((value & NID_INTEGRATED_TOUCH) || (value & NID_EXTERNAL_TOUCH));
  16 }
  17
  18 int MaxTouchPoints() {
  19   if (!IsTouchDevicePresent())
  20     return 0;
  21
  22   return GetSystemMetrics(SM_MAXIMUMTOUCHES);
  23 }
  24
  25 int GetAvailablePointerTypes() {
  26   int available_pointer_types = 0;
  27   if (IsTouchDevicePresent())
  28     available_pointer_types |= POINTER_TYPE_COARSE;
  29   if (GetSystemMetrics(SM_MOUSEPRESENT) != 0 &&
  30       GetSystemMetrics(SM_CMOUSEBUTTONS) > 0)
  31     available_pointer_types |= POINTER_TYPE_FINE;
  32
  33   if (available_pointer_types == 0)
  34     available_pointer_types = POINTER_TYPE_NONE;
  35
  36   return available_pointer_types;
  37 }
  38
  39 PointerType GetPrimaryPointerType() {
  40   int available_pointer_types = GetAvailablePointerTypes();
  41   if (available_pointer_types & POINTER_TYPE_FINE)
  42     return POINTER_TYPE_FINE;
  43   if (available_pointer_types & POINTER_TYPE_COARSE)
  44     return POINTER_TYPE_COARSE;
  45   DCHECK_EQ(available_pointer_types, POINTER_TYPE_NONE);
  46   return POINTER_TYPE_NONE;
  47 }
  48
  49 int GetAvailableHoverTypes() {
  50   int available_hover_types = 0;
  51   if (IsTouchDevicePresent())
  52     available_hover_types |= HOVER_TYPE_ON_DEMAND;
  53   if (GetSystemMetrics(SM_MOUSEPRESENT) != 0)
  54     available_hover_types |= HOVER_TYPE_HOVER;
  55
  56   if (available_hover_types == 0)
  57     available_hover_types = HOVER_TYPE_NONE;
  58
  59   return available_hover_types;
  60 }
  61
  62 HoverType GetPrimaryHoverType() {
  63   int available_hover_types = GetAvailableHoverTypes();
  64   if (available_hover_types & HOVER_TYPE_HOVER)
  65     return HOVER_TYPE_HOVER;
  66   if (available_hover_types & HOVER_TYPE_ON_DEMAND)
  67     return HOVER_TYPE_ON_DEMAND;
  68   DCHECK_EQ(available_hover_types, HOVER_TYPE_NONE);
  69   return HOVER_TYPE_NONE;
  70 }
  71
  72 }  // namespace ui