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[Windows] Add textScaleFactor support (flutter/engine#33316)

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This commit is contained in:
moko256 2022-05-24 01:10:15 +09:00 committed by GitHub
parent abb62f4cfe
commit 5bf7ff5530
2 changed files with 43 additions and 5 deletions
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40
engine/src/flutter/shell/platform/windows/settings_plugin_win32.cc
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@ -12,6 +12,10 @@ namespace {
constexpr wchar_t kGetPreferredBrightnessRegKey[] =
L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize";
constexpr wchar_t kGetPreferredBrightnessRegValue[] = L"AppsUseLightTheme";
constexpr wchar_t kGetTextScaleFactorRegKey[] =
L"Software\\Microsoft\\Accessibility";
constexpr wchar_t kGetTextScaleFactorRegValue[] = L"TextScaleFactor";
} // namespace
// static
@ -26,21 +30,28 @@ SettingsPluginWin32::SettingsPluginWin32(BinaryMessenger* messenger,
: SettingsPlugin(messenger, task_runner) {
RegOpenKeyEx(HKEY_CURRENT_USER, kGetPreferredBrightnessRegKey,
RRF_RT_REG_DWORD, KEY_NOTIFY, &preferred_brightness_reg_hkey_);
RegOpenKeyEx(HKEY_CURRENT_USER, kGetTextScaleFactorRegKey, RRF_RT_REG_DWORD,
KEY_NOTIFY, &text_scale_factor_reg_hkey_);
}
SettingsPluginWin32::~SettingsPluginWin32() {
StopWatching();
RegCloseKey(preferred_brightness_reg_hkey_);
RegCloseKey(text_scale_factor_reg_hkey_);
}
void SettingsPluginWin32::StartWatching() {
if (preferred_brightness_reg_hkey_ != NULL) {
if (preferred_brightness_reg_hkey_ != nullptr) {
WatchPreferredBrightnessChanged();
}
if (text_scale_factor_reg_hkey_ != nullptr) {
WatchTextScaleFactorChanged();
}
}
void SettingsPluginWin32::StopWatching() {
preferred_brightness_changed_watcher_ = nullptr;
text_scale_factor_changed_watcher_ = nullptr;
}
bool SettingsPluginWin32::GetAlwaysUse24HourFormat() {
@ -48,7 +59,18 @@ bool SettingsPluginWin32::GetAlwaysUse24HourFormat() {
}
float SettingsPluginWin32::GetTextScaleFactor() {
return 1.0;
DWORD text_scale_factor;
DWORD text_scale_factor_size = sizeof(text_scale_factor);
LONG result = RegGetValue(
HKEY_CURRENT_USER, kGetTextScaleFactorRegKey, kGetTextScaleFactorRegValue,
RRF_RT_REG_DWORD, nullptr, &text_scale_factor, &text_scale_factor_size);
if (result == 0) {
return text_scale_factor / 100.0;
} else {
// The current OS does not have text scale factor.
return 1.0;
}
}
SettingsPlugin::PlatformBrightness
@ -83,4 +105,18 @@ void SettingsPluginWin32::WatchPreferredBrightnessChanged() {
preferred_brightness_changed_watcher_->GetHandle(), TRUE);
}
void SettingsPluginWin32::WatchTextScaleFactorChanged() {
text_scale_factor_changed_watcher_ =
std::make_unique<EventWatcherWin32>([this]() {
task_runner_->PostTask([this]() {
SendSettings();
WatchTextScaleFactorChanged();
});
});
RegNotifyChangeKeyValue(
text_scale_factor_reg_hkey_, FALSE, REG_NOTIFY_CHANGE_LAST_SET,
text_scale_factor_changed_watcher_->GetHandle(), TRUE);
}
} // namespace flutter

8
engine/src/flutter/shell/platform/windows/settings_plugin_win32.h
View File

@ -39,11 +39,13 @@ class SettingsPluginWin32 : public SettingsPlugin {
private:
void WatchPreferredBrightnessChanged();
void WatchTextScaleFactorChanged();
HKEY preferred_brightness_reg_hkey_ = NULL;
HKEY preferred_brightness_reg_hkey_ = nullptr;
HKEY text_scale_factor_reg_hkey_ = nullptr;
std::unique_ptr<EventWatcherWin32> preferred_brightness_changed_watcher_{
nullptr};
std::unique_ptr<EventWatcherWin32> preferred_brightness_changed_watcher_;
std::unique_ptr<EventWatcherWin32> text_scale_factor_changed_watcher_;
SettingsPluginWin32(const SettingsPluginWin32&) = delete;
SettingsPluginWin32& operator=(const SettingsPluginWin32&) = delete;