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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/touch/touch_device.h"
#include "ui/base/ui_base_switches.h"
#include "ui/gfx/display.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/screen.h"
#if defined(OS_WIN)
#include "base/win/metro.h"
#include <Windows.h>
#endif // defined(OS_WIN)
namespace ui {
namespace {
bool ScaleFactorComparator(const ScaleFactor& lhs, const ScaleFactor& rhs){
return GetImageScale(lhs) < GetImageScale(rhs);
}
std::vector<ScaleFactor>* g_supported_scale_factors = NULL;
#if defined(OS_WIN)
// 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;
}
}
// We use the touch layout only when we are running in Metro mode.
return base::win::IsMetroProcess() && ui::IsTouchDevicePresent();
}
#endif // defined(OS_WIN)
const float kScaleFactorScales[] = {1.0f, 1.0f, 1.25f, 1.33f, 1.4f, 1.5f, 1.8f,
2.0f, 3.0f};
COMPILE_ASSERT(NUM_SCALE_FACTORS == arraysize(kScaleFactorScales),
kScaleFactorScales_incorrect_size);
} // namespace
DisplayLayout GetDisplayLayout() {
#if defined(OS_WIN)
if (UseTouchOptimizedUI())
return LAYOUT_TOUCH;
#endif
return LAYOUT_DESKTOP;
}
void SetSupportedScaleFactors(
const std::vector<ui::ScaleFactor>& scale_factors) {
if (g_supported_scale_factors != NULL)
delete g_supported_scale_factors;
g_supported_scale_factors = new std::vector<ScaleFactor>(scale_factors);
std::sort(g_supported_scale_factors->begin(),
g_supported_scale_factors->end(),
ScaleFactorComparator);
// Set ImageSkia's supported scales.
std::vector<float> scales;
for (std::vector<ScaleFactor>::const_iterator it =
g_supported_scale_factors->begin();
it != g_supported_scale_factors->end(); ++it) {
scales.push_back(GetImageScale(*it));
}
gfx::ImageSkia::SetSupportedScales(scales);
}
const std::vector<ScaleFactor>& GetSupportedScaleFactors() {
DCHECK(g_supported_scale_factors != NULL);
return *g_supported_scale_factors;
}
ScaleFactor GetSupportedScaleFactor(float scale) {
DCHECK(g_supported_scale_factors != NULL);
ScaleFactor closest_match = SCALE_FACTOR_100P;
float smallest_diff = std::numeric_limits<float>::max();
for (size_t i = 0; i < g_supported_scale_factors->size(); ++i) {
ScaleFactor scale_factor = (*g_supported_scale_factors)[i];
float diff = std::abs(kScaleFactorScales[scale_factor] - scale);
if (diff < smallest_diff) {
closest_match = scale_factor;
smallest_diff = diff;
}
}
DCHECK_NE(closest_match, SCALE_FACTOR_NONE);
return closest_match;
}
float GetImageScale(ScaleFactor scale_factor) {
return kScaleFactorScales[scale_factor];
}
bool IsScaleFactorSupported(ScaleFactor scale_factor) {
DCHECK(g_supported_scale_factors != NULL);
return std::find(g_supported_scale_factors->begin(),
g_supported_scale_factors->end(),
scale_factor) != g_supported_scale_factors->end();
}
// Returns the scale factor closest to |scale| from the full list of factors.
// Note that it does NOT rely on the list of supported scale factors.
// Finding the closest match is inefficient and shouldn't be done frequently.
ScaleFactor FindClosestScaleFactorUnsafe(float scale) {
float smallest_diff = std::numeric_limits<float>::max();
ScaleFactor closest_match = SCALE_FACTOR_100P;
for (int i = SCALE_FACTOR_100P; i < NUM_SCALE_FACTORS; ++i) {
const ScaleFactor scale_factor = static_cast<ScaleFactor>(i);
float diff = std::abs(kScaleFactorScales[scale_factor] - scale);
if (diff < smallest_diff) {
closest_match = scale_factor;
smallest_diff = diff;
}
}
return closest_match;
}
namespace test {
ScopedSetSupportedScaleFactors::ScopedSetSupportedScaleFactors(
const std::vector<ui::ScaleFactor>& new_scale_factors) {
if (g_supported_scale_factors) {
original_scale_factors_ =
new std::vector<ScaleFactor>(*g_supported_scale_factors);
} else {
original_scale_factors_ = NULL;
}
SetSupportedScaleFactors(new_scale_factors);
}
ScopedSetSupportedScaleFactors::~ScopedSetSupportedScaleFactors() {
if (original_scale_factors_) {
SetSupportedScaleFactors(*original_scale_factors_);
delete original_scale_factors_;
} else {
delete g_supported_scale_factors;
g_supported_scale_factors = NULL;
}
}
} // namespace test
#if !defined(OS_MACOSX)
ScaleFactor GetScaleFactorForNativeView(gfx::NativeView view) {
gfx::Screen* screen = gfx::Screen::GetScreenFor(view);
if (screen->IsDIPEnabled()) {
gfx::Display display = screen->GetDisplayNearestWindow(view);
return GetSupportedScaleFactor(display.device_scale_factor());
}
return ui::SCALE_FACTOR_100P;
}
#endif // !defined(OS_MACOSX)
} // namespace ui
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