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feat: detect high contrast color mode (#15493)

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* feat: add event and method to detect high contrast color mode

* docs: add docs for isHighContrastColorScheme and high-contrast-color-scheme-changed

* refactor: correct type of contrast
This commit is contained in:
Heilig Benedek 2018-10-31 15:22:18 +01:00 • committed by John Kleinschmidt
parent aa6f7a5d9f
commit 6d2a088be9
4 changed files with 54 additions and 5 deletions
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29
atom/browser/api/atom_api_system_preferences_win.cc
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@ -20,6 +20,18 @@ namespace {
const wchar_t kSystemPreferencesWindowClass[] =
L"Electron_SystemPreferencesHostWindow";
bool g_is_high_contract_color_scheme = false;
bool g_is_high_contract_color_scheme_initialized = false;
void UpdateHighContrastColorScheme() {
HIGHCONTRAST high_contrast = {0};
high_contrast.cbSize = sizeof(HIGHCONTRAST);
g_is_high_contract_color_scheme =
SystemParametersInfo(SPI_GETHIGHCONTRAST, 0, &high_contrast, 0) &&
((high_contrast.dwFlags & HCF_HIGHCONTRASTON) != 0);
g_is_high_contract_color_scheme_initialized = true;
}
} // namespace
namespace api {
@ -28,6 +40,12 @@ bool SystemPreferences::IsAeroGlassEnabled() {
return ui::win::IsAeroGlassEnabled();
}
bool SystemPreferences::IsHighContrastColorScheme() {
if (!g_is_high_contract_color_scheme_initialized)
UpdateHighContrastColorScheme();
return g_is_high_contract_color_scheme;
}
std::string hexColorDWORDToRGBA(DWORD color) {
DWORD rgba = color << 8 | color >> 24;
std::ostringstream stream;
@ -119,6 +137,7 @@ std::string SystemPreferences::GetColor(const std::string& color,
void SystemPreferences::InitializeWindow() {
invertered_color_scheme_ = IsInvertedColorScheme();
high_contrast_color_scheme_ = IsHighContrastColorScheme();
// Wait until app is ready before creating sys color listener
// Creating this listener before the app is ready causes global shortcuts
@ -169,6 +188,9 @@ LRESULT CALLBACK SystemPreferences::WndProc(HWND hwnd,
Emit("accent-color-changed", hexColorDWORDToRGBA(new_color));
current_color_ = new_color_string;
}
} else if (message == WM_SYSCOLORCHANGE ||
(message == WM_SETTINGCHANGE && wparam == SPI_SETHIGHCONTRAST)) {
UpdateHighContrastColorScheme();
}
return ::DefWindowProc(hwnd, message, wparam, lparam);
}
@ -179,6 +201,13 @@ void SystemPreferences::OnSysColorChange() {
invertered_color_scheme_ = new_invertered_color_scheme;
Emit("inverted-color-scheme-changed", new_invertered_color_scheme);
}
bool new_high_contrast_color_scheme = IsHighContrastColorScheme();
if (new_high_contrast_color_scheme != high_contrast_color_scheme_) {
high_contrast_color_scheme_ = new_high_contrast_color_scheme;
Emit("high-contrast-color-scheme-changed", new_high_contrast_color_scheme);
}
Emit("color-changed");
}