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// 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 "ui/base/layout.h"
#include <algorithm>
#include <cmath>
#include <limits>
#include "base/basictypes.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "build/build_config.h"
#include "ui/base/ui_base_switches.h"
#include "ui/gfx/screen.h"
#if defined(OS_MACOSX) && !defined(OS_IOS)
#include "base/mac/mac_util.h"
#endif
#if defined(OS_WIN)
#include "base/win/metro.h"
#include <Windows.h>
#endif // defined(OS_WIN)
namespace {
#if defined(OS_WIN) || defined(USE_ASH)
// Helper function that determines whether we want to optimize the UI for touch.
bool UseTouchOptimizedUI() {
// If --touch-optimized-ui is specified and not set to "auto", then override
// the hardware-determined setting (eg. for testing purposes).
static bool has_touch_optimized_ui = CommandLine::ForCurrentProcess()->
HasSwitch(switches::kTouchOptimizedUI);
if (has_touch_optimized_ui) {
const std::string switch_value = CommandLine::ForCurrentProcess()->
GetSwitchValueASCII(switches::kTouchOptimizedUI);
// Note that simply specifying the switch is the same as enabled.
if (switch_value.empty() ||
switch_value == switches::kTouchOptimizedUIEnabled) {
return true;
} else if (switch_value == switches::kTouchOptimizedUIDisabled) {
return false;
} else if (switch_value != switches::kTouchOptimizedUIAuto) {
LOG(ERROR) << "Invalid --touch-optimized-ui option: " << switch_value;
}
}
#if defined(OS_WIN)
// On Windows, we use the touch layout only when we are running in
// Metro mode.
return base::win::IsMetroProcess() && base::win::IsTouchEnabled();
#else
return false;
#endif
}
#endif // defined(OS_WIN) || defined(USE_ASH)
const float kScaleFactorScales[] = {1.0f, 1.4f, 1.8f, 2.0f};
COMPILE_ASSERT(ui::NUM_SCALE_FACTORS == arraysize(kScaleFactorScales),
kScaleFactorScales_incorrect_size);
const size_t kScaleFactorScalesLength = arraysize(kScaleFactorScales);
std::vector<ui::ScaleFactor>& GetSupportedScaleFactorsInternal() {
static std::vector<ui::ScaleFactor>* supported_scale_factors =
new std::vector<ui::ScaleFactor>();
if (supported_scale_factors->empty()) {
supported_scale_factors->push_back(ui::SCALE_FACTOR_100P);
// TODO(rohitrao): Set the appropriate scale factors for iOS. Ideally set
// either 100P or 200P but not both, since a given device will only ever use one
// scale factor.
#if defined(OS_MACOSX) && !defined(OS_IOS) && defined(ENABLE_HIDPI)
if (base::mac::IsOSLionOrLater())
supported_scale_factors->push_back(ui::SCALE_FACTOR_200P);
#elif defined(OS_WIN) && defined(ENABLE_HIDPI)
if (base::win::IsMetroProcess() && base::win::IsTouchEnabled()) {
supported_scale_factors->push_back(ui::SCALE_FACTOR_140P);
supported_scale_factors->push_back(ui::SCALE_FACTOR_180P);
}
#elif defined(USE_ASH)
supported_scale_factors->push_back(ui::SCALE_FACTOR_200P);
#endif
}
return *supported_scale_factors;
}
} // namespace
namespace ui {
// Note that this function should be extended to select
// LAYOUT_TOUCH when appropriate on more platforms than just
// Windows and Ash.
DisplayLayout GetDisplayLayout() {
#if defined(USE_ASH)
if (UseTouchOptimizedUI())
return LAYOUT_TOUCH;
return LAYOUT_ASH;
#elif defined(OS_WIN)
if (UseTouchOptimizedUI())
return LAYOUT_TOUCH;
return LAYOUT_DESKTOP;
#else
return LAYOUT_DESKTOP;
#endif
}
ScaleFactor GetScaleFactorFromScale(float scale) {
ScaleFactor closest_match = SCALE_FACTOR_100P;
float smallest_diff = std::numeric_limits<float>::max();
const std::vector<ScaleFactor>& supported =
GetSupportedScaleFactorsInternal();
for (size_t i = 0; i < supported.size(); ++i) {
ScaleFactor scale_factor = supported[i];
float diff = std::abs(kScaleFactorScales[scale_factor] - scale);
if (diff < smallest_diff) {
closest_match = scale_factor;
smallest_diff = diff;
}
}
return closest_match;
}
float GetScaleFactorScale(ScaleFactor scale_factor) {
return kScaleFactorScales[scale_factor];
}
std::vector<ScaleFactor> GetSupportedScaleFactors() {
return GetSupportedScaleFactorsInternal();
}
bool IsScaleFactorSupported(ScaleFactor scale_factor) {
const std::vector<ScaleFactor>& supported =
GetSupportedScaleFactorsInternal();
return std::find(supported.begin(), supported.end(), scale_factor) !=
supported.end();
}
namespace test {
void SetSupportedScaleFactors(
const std::vector<ui::ScaleFactor>& scale_factors) {
std::vector<ui::ScaleFactor>& supported_scale_factors =
GetSupportedScaleFactorsInternal();
supported_scale_factors = scale_factors;
}
} // namespace test
#if !defined(OS_MACOSX)
ScaleFactor GetScaleFactorForNativeView(gfx::NativeView view) {
if (gfx::Screen::IsDIPEnabled()) {
gfx::Display display = gfx::Screen::GetDisplayNearestWindow(view);
return GetScaleFactorFromScale(display.device_scale_factor());
}
return ui::SCALE_FACTOR_100P;
}
#endif // !defined(OS_MACOSX)
} // namespace ui
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