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gecko-dev
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gecko-dev/widget/gtk/nsLookAndFeel.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:expandtab:shiftwidth=2:tabstop=2:
*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// for strtod()
#include <stdlib.h>
#include "nsLookAndFeel.h"
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <pango/pango.h>
#include <pango/pango-fontmap.h>
#include <fontconfig/fontconfig.h>
#include "gfxPlatformGtk.h"
#include "mozilla/FontPropertyTypes.h"
#include "mozilla/RelativeLuminanceUtils.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/StaticPrefs_widget.h"
#include "ScreenHelperGTK.h"
#include "gtkdrawing.h"
#include "nsStyleConsts.h"
#include "gfxFontConstants.h"
#include "WidgetUtils.h"
#include "nsWindow.h"
#include "mozilla/gfx/2D.h"
#include <cairo-gobject.h>
#include "WidgetStyleCache.h"
#include "prenv.h"
#include "nsCSSColorUtils.h"
using namespace mozilla;
using mozilla::LookAndFeel;
#undef LOG
#ifdef MOZ_LOGGING
# include "mozilla/Logging.h"
# include "nsTArray.h"
# include "Units.h"
extern mozilla::LazyLogModule gWidgetLog;
# define LOG(args) MOZ_LOG(gWidgetLog, mozilla::LogLevel::Debug, args)
#else
# define LOG(args)
#endif /* MOZ_LOGGING */
#define GDK_COLOR_TO_NS_RGB(c) \
((nscolor)NS_RGB(c.red >> 8, c.green >> 8, c.blue >> 8))
#define GDK_RGBA_TO_NS_RGBA(c) \
((nscolor)NS_RGBA((int)((c).red * 255), (int)((c).green * 255), \
(int)((c).blue * 255), (int)((c).alpha * 255)))
#if !GTK_CHECK_VERSION(3, 12, 0)
# define GTK_STATE_FLAG_LINK (static_cast<GtkStateFlags>(1 << 9))
#endif
nsLookAndFeel::nsLookAndFeel() = default;
nsLookAndFeel::~nsLookAndFeel() {}
// Modifies color |*aDest| as if a pattern of color |aSource| was painted with
// CAIRO_OPERATOR_OVER to a surface with color |*aDest|.
static void ApplyColorOver(const GdkRGBA& aSource, GdkRGBA* aDest) {
gdouble sourceCoef = aSource.alpha;
gdouble destCoef = aDest->alpha * (1.0 - sourceCoef);
gdouble resultAlpha = sourceCoef + destCoef;
if (resultAlpha != 0.0) { // don't divide by zero
destCoef /= resultAlpha;
sourceCoef /= resultAlpha;
aDest->red = sourceCoef * aSource.red + destCoef * aDest->red;
aDest->green = sourceCoef * aSource.green + destCoef * aDest->green;
aDest->blue = sourceCoef * aSource.blue + destCoef * aDest->blue;
aDest->alpha = resultAlpha;
}
}
static void GetLightAndDarkness(const GdkRGBA& aColor, double* aLightness,
double* aDarkness) {
double sum = aColor.red + aColor.green + aColor.blue;
*aLightness = sum * aColor.alpha;
*aDarkness = (3.0 - sum) * aColor.alpha;
}
static bool GetGradientColors(const GValue* aValue, GdkRGBA* aLightColor,
GdkRGBA* aDarkColor) {
if (!G_TYPE_CHECK_VALUE_TYPE(aValue, CAIRO_GOBJECT_TYPE_PATTERN))
return false;
auto pattern = static_cast<cairo_pattern_t*>(g_value_get_boxed(aValue));
if (!pattern) return false;
// Just picking the lightest and darkest colors as simple samples rather
// than trying to blend, which could get messy if there are many stops.
if (CAIRO_STATUS_SUCCESS !=
cairo_pattern_get_color_stop_rgba(pattern, 0, nullptr, &aDarkColor->red,
&aDarkColor->green, &aDarkColor->blue,
&aDarkColor->alpha))
return false;
double maxLightness, maxDarkness;
GetLightAndDarkness(*aDarkColor, &maxLightness, &maxDarkness);
*aLightColor = *aDarkColor;
GdkRGBA stop;
for (int index = 1;
CAIRO_STATUS_SUCCESS ==
cairo_pattern_get_color_stop_rgba(pattern, index, nullptr, &stop.red,
&stop.green, &stop.blue, &stop.alpha);
++index) {
double lightness, darkness;
GetLightAndDarkness(stop, &lightness, &darkness);
if (lightness > maxLightness) {
maxLightness = lightness;
*aLightColor = stop;
}
if (darkness > maxDarkness) {
maxDarkness = darkness;
*aDarkColor = stop;
}
}
return true;
}
static bool GetUnicoBorderGradientColors(GtkStyleContext* aContext,
GdkRGBA* aLightColor,
GdkRGBA* aDarkColor) {
// Ubuntu 12.04 has GTK engine Unico-1.0.2, which overrides render_frame,
// providing its own border code. Ubuntu 14.04 has
// Unico-1.0.3+14.04.20140109, which does not override render_frame, and
// so does not need special attention. The earlier Unico can be detected
// by the -unico-border-gradient style property it registers.
// gtk_style_properties_lookup_property() is checked first to avoid the
// warning from gtk_style_context_get_property() when the property does
// not exist. (gtk_render_frame() of GTK+ 3.16 no longer uses the
// engine.)
const char* propertyName = "-unico-border-gradient";
if (!gtk_style_properties_lookup_property(propertyName, nullptr, nullptr))
return false;
// -unico-border-gradient is used only when the CSS node's engine is Unico.
GtkThemingEngine* engine;
GtkStateFlags state = gtk_style_context_get_state(aContext);
gtk_style_context_get(aContext, state, "engine", &engine, nullptr);
if (strcmp(g_type_name(G_TYPE_FROM_INSTANCE(engine)), "UnicoEngine") != 0)
return false;
// draw_border() of Unico engine uses -unico-border-gradient
// in preference to border-color.
GValue value = G_VALUE_INIT;
gtk_style_context_get_property(aContext, propertyName, state, &value);
bool result = GetGradientColors(&value, aLightColor, aDarkColor);
g_value_unset(&value);
return result;
}
// Sets |aLightColor| and |aDarkColor| to colors from |aContext|. Returns
// true if |aContext| uses these colors to render a visible border.
// If returning false, then the colors returned are a fallback from the
// border-color value even though |aContext| does not use these colors to
// render a border.
static bool GetBorderColors(GtkStyleContext* aContext, GdkRGBA* aLightColor,
GdkRGBA* aDarkColor) {
// Determine whether the border on this style context is visible.
GtkStateFlags state = gtk_style_context_get_state(aContext);
GtkBorderStyle borderStyle;
gtk_style_context_get(aContext, state, GTK_STYLE_PROPERTY_BORDER_STYLE,
&borderStyle, nullptr);
bool visible = borderStyle != GTK_BORDER_STYLE_NONE &&
borderStyle != GTK_BORDER_STYLE_HIDDEN;
if (visible) {
// GTK has an initial value of zero for border-widths, and so themes
// need to explicitly set border-widths to make borders visible.
GtkBorder border;
gtk_style_context_get_border(aContext, state, &border);
visible = border.top != 0 || border.right != 0 || border.bottom != 0 ||
border.left != 0;
}
if (visible &&
GetUnicoBorderGradientColors(aContext, aLightColor, aDarkColor))
return true;
// The initial value for the border-color is the foreground color, and so
// this will usually return a color distinct from the background even if
// there is no visible border detected.
gtk_style_context_get_border_color(aContext, state, aDarkColor);
// TODO GTK3 - update aLightColor
// for GTK_BORDER_STYLE_INSET/OUTSET/GROVE/RIDGE border styles.
// https://bugzilla.mozilla.org/show_bug.cgi?id=978172#c25
*aLightColor = *aDarkColor;
return visible;
}
static bool GetBorderColors(GtkStyleContext* aContext, nscolor* aLightColor,
nscolor* aDarkColor) {
GdkRGBA lightColor, darkColor;
bool ret = GetBorderColors(aContext, &lightColor, &darkColor);
*aLightColor = GDK_RGBA_TO_NS_RGBA(lightColor);
*aDarkColor = GDK_RGBA_TO_NS_RGBA(darkColor);
return ret;
}
// Finds ideal cell highlight colors used for unfocused+selected cells distinct
// from both Highlight, used as focused+selected background, and the listbox
// background which is assumed to be similar to -moz-field
nsresult nsLookAndFeel::InitCellHighlightColors() {
// NS_SUFFICIENT_LUMINOSITY_DIFFERENCE is the a11y standard for text
// on a background. Use 20% of that standard since we have a background
// on top of another background
int32_t minLuminosityDifference = NS_SUFFICIENT_LUMINOSITY_DIFFERENCE / 5;
int32_t backLuminosityDifference =
NS_LUMINOSITY_DIFFERENCE(mMozWindowBackground, mFieldBackground);
if (backLuminosityDifference >= minLuminosityDifference) {
mMozCellHighlightBackground = mMozWindowBackground;
mMozCellHighlightText = mMozWindowText;
return NS_OK;
}
uint16_t hue, sat, luminance;
uint8_t alpha;
mMozCellHighlightBackground = mFieldBackground;
mMozCellHighlightText = mFieldText;
NS_RGB2HSV(mMozCellHighlightBackground, hue, sat, luminance, alpha);
uint16_t step = 30;
// Lighten the color if the color is very dark
if (luminance <= step) {
luminance += step;
}
// Darken it if it is very light
else if (luminance >= 255 - step) {
luminance -= step;
}
// Otherwise, compute what works best depending on the text luminance.
else {
uint16_t textHue, textSat, textLuminance;
uint8_t textAlpha;
NS_RGB2HSV(mMozCellHighlightText, textHue, textSat, textLuminance,
textAlpha);
// Text is darker than background, use a lighter shade
if (textLuminance < luminance) {
luminance += step;
}
// Otherwise, use a darker shade
else {
luminance -= step;
}
}
NS_HSV2RGB(mMozCellHighlightBackground, hue, sat, luminance, alpha);
return NS_OK;
}
void nsLookAndFeel::NativeInit() { EnsureInit(); }
void nsLookAndFeel::RefreshImpl() {
if (mShouldRetainCacheForTest) {
return;
}
nsXPLookAndFeel::RefreshImpl();
moz_gtk_refresh();
mDefaultFontCached = false;
mButtonFontCached = false;
mFieldFontCached = false;
mMenuFontCached = false;
if (XRE_IsParentProcess()) {
mPrefersReducedMotionCached = false;
}
mInitialized = false;
}
nsTArray<LookAndFeelInt> nsLookAndFeel::GetIntCacheImpl() {
nsTArray<LookAndFeelInt> lookAndFeelIntCache =
nsXPLookAndFeel::GetIntCacheImpl();
const IntID kIdsToCache[] = {eIntID_SystemUsesDarkTheme,
eIntID_PrefersReducedMotion,
eIntID_UseAccessibilityTheme};
for (IntID id : kIdsToCache) {
lookAndFeelIntCache.AppendElement(
LookAndFeelInt{.id = id, .value = GetInt(id)});
}
return lookAndFeelIntCache;
}
void nsLookAndFeel::SetIntCacheImpl(
const nsTArray<LookAndFeelInt>& aLookAndFeelIntCache) {
for (const auto& entry : aLookAndFeelIntCache) {
switch (entry.id) {
case eIntID_SystemUsesDarkTheme:
mSystemUsesDarkTheme = entry.value;
break;
case eIntID_PrefersReducedMotion:
mPrefersReducedMotion = entry.value;
mPrefersReducedMotionCached = true;
break;
case eIntID_UseAccessibilityTheme:
mHighContrast = entry.value;
break;
}
}
}
nsresult nsLookAndFeel::NativeGetColor(ColorID aID, nscolor& aColor) {
EnsureInit();
nsresult res = NS_OK;
switch (aID) {
// These colors don't seem to be used for anything anymore in Mozilla
// (except here at least TextSelectBackground and TextSelectForeground)
// The CSS2 colors below are used.
case ColorID::WindowBackground:
case ColorID::WidgetBackground:
case ColorID::TextBackground:
case ColorID::Activecaption: // active window caption background
case ColorID::Appworkspace: // MDI background color
case ColorID::Background: // desktop background
case ColorID::Window:
case ColorID::Windowframe:
case ColorID::MozDialog:
case ColorID::MozCombobox:
aColor = mMozWindowBackground;
break;
case ColorID::WindowForeground:
case ColorID::WidgetForeground:
case ColorID::TextForeground:
case ColorID::Captiontext: // text in active window caption, size box, and
// scrollbar arrow box (!)
case ColorID::Windowtext:
case ColorID::MozDialogtext:
aColor = mMozWindowText;
break;
case ColorID::WidgetSelectBackground:
case ColorID::TextSelectBackground:
case ColorID::IMESelectedRawTextBackground:
case ColorID::IMESelectedConvertedTextBackground:
case ColorID::MozDragtargetzone:
case ColorID::MozHtmlCellhighlight:
case ColorID::Highlight: // preference selected item,
aColor = mTextSelectedBackground;
break;
case ColorID::WidgetSelectForeground:
case ColorID::TextSelectForeground:
case ColorID::IMESelectedRawTextForeground:
case ColorID::IMESelectedConvertedTextForeground:
case ColorID::Highlighttext:
case ColorID::MozHtmlCellhighlighttext:
aColor = mTextSelectedText;
break;
case ColorID::MozCellhighlight:
aColor = mMozCellHighlightBackground;
break;
case ColorID::MozCellhighlighttext:
aColor = mMozCellHighlightText;
break;
case ColorID::Widget3DHighlight:
aColor = NS_RGB(0xa0, 0xa0, 0xa0);
break;
case ColorID::Widget3DShadow:
aColor = NS_RGB(0x40, 0x40, 0x40);
break;
case ColorID::IMERawInputBackground:
case ColorID::IMEConvertedTextBackground:
aColor = NS_TRANSPARENT;
break;
case ColorID::IMERawInputForeground:
case ColorID::IMEConvertedTextForeground:
aColor = NS_SAME_AS_FOREGROUND_COLOR;
break;
case ColorID::IMERawInputUnderline:
case ColorID::IMEConvertedTextUnderline:
aColor = NS_SAME_AS_FOREGROUND_COLOR;
break;
case ColorID::IMESelectedRawTextUnderline:
case ColorID::IMESelectedConvertedTextUnderline:
aColor = NS_TRANSPARENT;
break;
case ColorID::SpellCheckerUnderline:
aColor = NS_RGB(0xff, 0, 0);
break;
// css2 http://www.w3.org/TR/REC-CSS2/ui.html#system-colors
case ColorID::Activeborder:
// active window border
aColor = mMozWindowActiveBorder;
break;
case ColorID::Inactiveborder:
// inactive window border
aColor = mMozWindowInactiveBorder;
break;
case ColorID::Graytext: // disabled text in windows, menus, etc.
case ColorID::Inactivecaptiontext: // text in inactive window caption
aColor = mMenuTextInactive;
break;
case ColorID::Inactivecaption:
// inactive window caption
aColor = mMozWindowInactiveCaption;
break;
case ColorID::Infobackground:
// tooltip background color
aColor = mInfoBackground;
break;
case ColorID::Infotext:
// tooltip text color
aColor = mInfoText;
break;
case ColorID::Menu:
// menu background
aColor = mMenuBackground;
break;
case ColorID::Menutext:
// menu text
aColor = mMenuText;
break;
case ColorID::Scrollbar:
// scrollbar gray area
aColor = mMozScrollbar;
break;
case ColorID::Threedlightshadow:
// 3-D highlighted inner edge color
// always same as background in GTK code
case ColorID::Threedface:
case ColorID::Buttonface:
// 3-D face color
aColor = mMozWindowBackground;
break;
case ColorID::Buttontext:
// text on push buttons
aColor = mButtonText;
break;
case ColorID::Buttonhighlight:
// 3-D highlighted edge color
case ColorID::Threedhighlight:
// 3-D highlighted outer edge color
aColor = mFrameOuterLightBorder;
break;
case ColorID::Buttonshadow:
// 3-D shadow edge color
case ColorID::Threedshadow:
// 3-D shadow inner edge color
aColor = mFrameInnerDarkBorder;
break;
case ColorID::Threeddarkshadow:
// Hardcode to black
aColor = NS_RGB(0x00, 0x00, 0x00);
break;
case ColorID::MozEventreerow:
case ColorID::Field:
aColor = mFieldBackground;
break;
case ColorID::Fieldtext:
aColor = mFieldText;
break;
case ColorID::MozButtondefault:
// default button border color
aColor = mButtonDefault;
break;
case ColorID::MozButtonhoverface:
aColor = mButtonHoverFace;
break;
case ColorID::MozButtonhovertext:
aColor = mButtonHoverText;
break;
case ColorID::MozGtkButtonactivetext:
aColor = mButtonActiveText;
break;
case ColorID::MozMenuhover:
aColor = mMenuHover;
break;
case ColorID::MozMenuhovertext:
aColor = mMenuHoverText;
break;
case ColorID::MozOddtreerow:
aColor = mOddCellBackground;
break;
case ColorID::MozNativehyperlinktext:
aColor = mNativeHyperLinkText;
break;
case ColorID::MozComboboxtext:
aColor = mComboBoxText;
break;
case ColorID::MozMenubartext:
aColor = mMenuBarText;
break;
case ColorID::MozMenubarhovertext:
aColor = mMenuBarHoverText;
break;
case ColorID::MozGtkInfoBarText:
aColor = mInfoBarText;
break;
default:
/* default color is BLACK */
aColor = 0;
res = NS_ERROR_FAILURE;
break;
}
return res;
}
static int32_t CheckWidgetStyle(GtkWidget* aWidget, const char* aStyle,
int32_t aResult) {
gboolean value = FALSE;
gtk_widget_style_get(aWidget, aStyle, &value, nullptr);
return value ? aResult : 0;
}
static int32_t ConvertGTKStepperStyleToMozillaScrollArrowStyle(
GtkWidget* aWidget) {
if (!aWidget) return mozilla::LookAndFeel::eScrollArrowStyle_Single;
return CheckWidgetStyle(aWidget, "has-backward-stepper",
mozilla::LookAndFeel::eScrollArrow_StartBackward) |
CheckWidgetStyle(aWidget, "has-forward-stepper",
mozilla::LookAndFeel::eScrollArrow_EndForward) |
CheckWidgetStyle(aWidget, "has-secondary-backward-stepper",
mozilla::LookAndFeel::eScrollArrow_EndBackward) |
CheckWidgetStyle(aWidget, "has-secondary-forward-stepper",
mozilla::LookAndFeel::eScrollArrow_StartForward);
}
nsresult nsLookAndFeel::GetIntImpl(IntID aID, int32_t& aResult) {
nsresult res = NS_OK;
// Set these before they can get overrided in the nsXPLookAndFeel.
switch (aID) {
case eIntID_ScrollButtonLeftMouseButtonAction:
aResult = 0;
return NS_OK;
case eIntID_ScrollButtonMiddleMouseButtonAction:
aResult = 1;
return NS_OK;
case eIntID_ScrollButtonRightMouseButtonAction:
aResult = 2;
return NS_OK;
default:
break;
}
res = nsXPLookAndFeel::GetIntImpl(aID, aResult);
if (NS_SUCCEEDED(res)) return res;
res = NS_OK;
// We use delayed initialization by EnsureInit() here
// to make sure mozilla::Preferences is available (Bug 115807).
// eIntID_UseAccessibilityTheme is requested before user preferences
// are read, and so EnsureInit(), which depends on preference values,
// is deliberately delayed until required.
switch (aID) {
case eIntID_CaretBlinkTime:
EnsureInit();
aResult = mCaretBlinkTime;
break;
case eIntID_CaretWidth:
aResult = 1;
break;
case eIntID_ShowCaretDuringSelection:
aResult = 0;
break;
case eIntID_SelectTextfieldsOnKeyFocus: {
GtkWidget* entry;
GtkSettings* settings;
gboolean select_on_focus;
entry = gtk_entry_new();
g_object_ref_sink(entry);
settings = gtk_widget_get_settings(entry);
g_object_get(settings, "gtk-entry-select-on-focus", &select_on_focus,
nullptr);
if (select_on_focus)
aResult = 1;
else
aResult = 0;
gtk_widget_destroy(entry);
g_object_unref(entry);
} break;
case eIntID_ScrollToClick: {
GtkSettings* settings;
gboolean warps_slider = FALSE;
settings = gtk_settings_get_default();
if (g_object_class_find_property(G_OBJECT_GET_CLASS(settings),
"gtk-primary-button-warps-slider")) {
g_object_get(settings, "gtk-primary-button-warps-slider", &warps_slider,
nullptr);
}
if (warps_slider)
aResult = 1;
else
aResult = 0;
} break;
case eIntID_SubmenuDelay: {
GtkSettings* settings;
gint delay;
settings = gtk_settings_get_default();
g_object_get(settings, "gtk-menu-popup-delay", &delay, nullptr);
aResult = (int32_t)delay;
break;
}
case eIntID_TooltipDelay: {
aResult = 500;
break;
}
case eIntID_MenusCanOverlapOSBar:
// we want XUL popups to be able to overlap the task bar.
aResult = 1;
break;
case eIntID_SkipNavigatingDisabledMenuItem:
aResult = 1;
break;
case eIntID_DragThresholdX:
case eIntID_DragThresholdY: {
GtkWidget* box = gtk_hbox_new(FALSE, 5);
gint threshold = 0;
g_object_get(gtk_widget_get_settings(box), "gtk-dnd-drag-threshold",
&threshold, nullptr);
g_object_ref_sink(box);
aResult = threshold;
} break;
case eIntID_ScrollArrowStyle: {
GtkWidget* scrollbar = GetWidget(MOZ_GTK_SCROLLBAR_HORIZONTAL);
aResult = ConvertGTKStepperStyleToMozillaScrollArrowStyle(scrollbar);
break;
}
case eIntID_ScrollSliderStyle:
aResult = eScrollThumbStyle_Proportional;
break;
case eIntID_TreeOpenDelay:
aResult = 1000;
break;
case eIntID_TreeCloseDelay:
aResult = 1000;
break;
case eIntID_TreeLazyScrollDelay:
aResult = 150;
break;
case eIntID_TreeScrollDelay:
aResult = 100;
break;
case eIntID_TreeScrollLinesMax:
aResult = 3;
break;
case eIntID_DWMCompositor:
case eIntID_WindowsClassic:
case eIntID_WindowsDefaultTheme:
case eIntID_WindowsThemeIdentifier:
case eIntID_OperatingSystemVersionIdentifier:
aResult = 0;
res = NS_ERROR_NOT_IMPLEMENTED;
break;
case eIntID_TouchEnabled:
aResult = mozilla::widget::WidgetUtils::IsTouchDeviceSupportPresent();
break;
case eIntID_MacGraphiteTheme:
aResult = 0;
res = NS_ERROR_NOT_IMPLEMENTED;
break;
case eIntID_AlertNotificationOrigin:
aResult = NS_ALERT_TOP;
break;
case eIntID_IMERawInputUnderlineStyle:
case eIntID_IMEConvertedTextUnderlineStyle:
aResult = NS_STYLE_TEXT_DECORATION_STYLE_SOLID;
break;
case eIntID_IMESelectedRawTextUnderlineStyle:
case eIntID_IMESelectedConvertedTextUnderline:
aResult = NS_STYLE_TEXT_DECORATION_STYLE_NONE;
break;
case eIntID_SpellCheckerUnderlineStyle:
aResult = NS_STYLE_TEXT_DECORATION_STYLE_WAVY;
break;
case eIntID_MenuBarDrag:
EnsureInit();
aResult = mMenuSupportsDrag;
break;
case eIntID_ScrollbarButtonAutoRepeatBehavior:
aResult = 1;
break;
case eIntID_SwipeAnimationEnabled:
aResult = 0;
break;
case eIntID_ContextMenuOffsetVertical:
case eIntID_ContextMenuOffsetHorizontal:
aResult = 2;
break;
case eIntID_GTKCSDAvailable:
EnsureInit();
aResult = mCSDAvailable;
break;
case eIntID_GTKCSDHideTitlebarByDefault:
EnsureInit();
aResult = mCSDHideTitlebarByDefault;
break;
case eIntID_GTKCSDMaximizeButton:
EnsureInit();
aResult = mCSDMaximizeButton;
break;
case eIntID_GTKCSDMinimizeButton:
EnsureInit();
aResult = mCSDMinimizeButton;
break;
case eIntID_GTKCSDCloseButton:
EnsureInit();
aResult = mCSDCloseButton;
break;
case eIntID_GTKCSDTransparentBackground: {
// Enable transparent titlebar corners for titlebar mode.
GdkScreen* screen = gdk_screen_get_default();
aResult = gdk_screen_is_composited(screen)
? (nsWindow::GetSystemCSDSupportLevel() !=
nsWindow::CSD_SUPPORT_NONE)
: false;
break;
}
case eIntID_GTKCSDReversedPlacement:
EnsureInit();
aResult = mCSDReversedPlacement;
break;
case eIntID_PrefersReducedMotion: {
if (!mPrefersReducedMotionCached && XRE_IsParentProcess()) {
gboolean enableAnimations;
GtkSettings* settings = gtk_settings_get_default();
g_object_get(settings, "gtk-enable-animations", &enableAnimations,
nullptr);
mPrefersReducedMotion = enableAnimations ? 0 : 1;
}
aResult = mPrefersReducedMotion;
break;
}
case eIntID_SystemUsesDarkTheme: {
EnsureInit();
aResult = mSystemUsesDarkTheme;
break;
}
case eIntID_UseAccessibilityTheme: {
EnsureInit();
aResult = mHighContrast;
break;
}
default:
aResult = 0;
res = NS_ERROR_FAILURE;
}
return res;
}
nsresult nsLookAndFeel::GetFloatImpl(FloatID aID, float& aResult) {
nsresult res = NS_OK;
res = nsXPLookAndFeel::GetFloatImpl(aID, aResult);
if (NS_SUCCEEDED(res)) return res;
res = NS_OK;
switch (aID) {
case eFloatID_IMEUnderlineRelativeSize:
aResult = 1.0f;
break;
case eFloatID_SpellCheckerUnderlineRelativeSize:
aResult = 1.0f;
break;
case eFloatID_CaretAspectRatio:
EnsureInit();
aResult = mCaretRatio;
break;
default:
aResult = -1.0;
res = NS_ERROR_FAILURE;
}
return res;
}
static void GetSystemFontInfo(GtkStyleContext* aStyle, nsString* aFontName,
gfxFontStyle* aFontStyle) {
aFontStyle->style = FontSlantStyle::Normal();
// As in
// https://git.gnome.org/browse/gtk+/tree/gtk/gtkwidget.c?h=3.22.19#n10333
PangoFontDescription* desc;
gtk_style_context_get(aStyle, gtk_style_context_get_state(aStyle), "font",
&desc, nullptr);
aFontStyle->systemFont = true;
NS_NAMED_LITERAL_STRING(quote, "\"");
NS_ConvertUTF8toUTF16 family(pango_font_description_get_family(desc));
*aFontName = quote + family + quote;
aFontStyle->weight = FontWeight(pango_font_description_get_weight(desc));
// FIXME: Set aFontStyle->stretch correctly!
aFontStyle->stretch = FontStretch::Normal();
float size = float(pango_font_description_get_size(desc)) / PANGO_SCALE;
// |size| is now either pixels or pango-points (not Mozilla-points!)
if (!pango_font_description_get_size_is_absolute(desc)) {
// |size| is in pango-points, so convert to pixels.
size *= float(gfxPlatformGtk::GetFontScaleDPI()) / POINTS_PER_INCH_FLOAT;
}
// |size| is now pixels but not scaled for the hidpi displays,
aFontStyle->size = size;
pango_font_description_free(desc);
}
bool nsLookAndFeel::GetFontImpl(FontID aID, nsString& aFontName,
gfxFontStyle& aFontStyle) {
switch (aID) {
case eFont_Menu: // css2
case eFont_PullDownMenu: // css3
aFontName = mMenuFontName;
aFontStyle = mMenuFontStyle;
break;
case eFont_Field: // css3
case eFont_List: // css3
aFontName = mFieldFontName;
aFontStyle = mFieldFontStyle;
break;
case eFont_Button: // css3
aFontName = mButtonFontName;
aFontStyle = mButtonFontStyle;
break;
case eFont_Caption: // css2
case eFont_Icon: // css2
case eFont_MessageBox: // css2
case eFont_SmallCaption: // css2
case eFont_StatusBar: // css2
case eFont_Window: // css3
case eFont_Document: // css3
case eFont_Workspace: // css3
case eFont_Desktop: // css3
case eFont_Info: // css3
case eFont_Dialog: // css3
case eFont_Tooltips: // moz
case eFont_Widget: // moz
default:
aFontName = mDefaultFontName;
aFontStyle = mDefaultFontStyle;
break;
}
// Scale the font for the current monitor
double scaleFactor = StaticPrefs::layout_css_devPixelsPerPx();
if (scaleFactor > 0) {
aFontStyle.size *=
widget::ScreenHelperGTK::GetGTKMonitorScaleFactor() / scaleFactor;
} else {
// Convert gdk pixels to CSS pixels.
aFontStyle.size /= gfxPlatformGtk::GetFontScaleFactor();
}
return true;
}
// Check color contrast according to
// https://www.w3.org/TR/AERT/#color-contrast
static bool HasGoodContrastVisibility(GdkRGBA& aColor1, GdkRGBA& aColor2) {
int32_t luminosityDifference = NS_LUMINOSITY_DIFFERENCE(
GDK_RGBA_TO_NS_RGBA(aColor1), GDK_RGBA_TO_NS_RGBA(aColor2));
if (luminosityDifference < NS_SUFFICIENT_LUMINOSITY_DIFFERENCE) {
return false;
}
double colorDifference = std::abs(aColor1.red - aColor2.red) +
std::abs(aColor1.green - aColor2.green) +
std::abs(aColor1.blue - aColor2.blue);
return (colorDifference * 255.0 > 500.0);
}
// Check if the foreground/background colors match with default white/black
// html page colors.
static bool IsGtkThemeCompatibleWithHTMLColors() {
GdkRGBA white = {1.0, 1.0, 1.0};
GdkRGBA black = {0.0, 0.0, 0.0};
GtkStyleContext* style = GetStyleContext(MOZ_GTK_WINDOW);
GdkRGBA textColor;
gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &textColor);
// Theme text color and default white html page background
if (!HasGoodContrastVisibility(textColor, white)) {
return false;
}
GdkRGBA backgroundColor;
gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL,
&backgroundColor);
// Theme background color and default white html page background
if (HasGoodContrastVisibility(backgroundColor, white)) {
return false;
}
// Theme background color and default black text color
return HasGoodContrastVisibility(backgroundColor, black);
}
static nsCString GetGtkTheme() {
MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
nsCString ret;
GtkSettings* settings = gtk_settings_get_for_screen(gdk_screen_get_default());
char* themeName = nullptr;
g_object_get(settings, "gtk-theme-name", &themeName, nullptr);
if (themeName) {
ret.Assign(themeName);
g_free(themeName);
}
return ret;
}
void nsLookAndFeel::ConfigureContentGtkTheme() {
GtkSettings* settings = gtk_settings_get_for_screen(gdk_screen_get_default());
nsAutoCString themeOverride;
mozilla::Preferences::GetCString("widget.content.gtk-theme-override",
themeOverride);
if (!themeOverride.IsEmpty()) {
g_object_set(settings, "gtk-theme-name", themeOverride.get(), nullptr);
LOG(("ConfigureContentGtkTheme(%s)\n", themeOverride.get()));
} else {
LOG(("ConfigureContentGtkTheme(%s)\n", GetGtkTheme().get()));
}
// Dark theme is active but user explicitly enables it, or we're on
// high-contrast (in which case we prevent content to mess up with the colors
// of the page), so we're done now.
if (!themeOverride.IsEmpty() || mHighContrast ||
StaticPrefs::widget_content_allow_gtk_dark_theme()) {
return;
}
// Try to disable 'gtk-application-prefer-dark-theme' first...
const gchar* dark_theme_setting = "gtk-application-prefer-dark-theme";
gboolean darkThemeDefault;
g_object_get(settings, dark_theme_setting, &darkThemeDefault, nullptr);
if (darkThemeDefault) {
LOG((" disabling gtk-application-prefer-dark-theme\n"));
g_object_set(settings, dark_theme_setting, FALSE, nullptr);
}
// ...and use a default Gtk theme as a fallback.
if (!IsGtkThemeCompatibleWithHTMLColors()) {
LOG((" Non-compatible dark theme, default to Adwaita\n"));
g_object_set(settings, "gtk-theme-name", "Adwaita", nullptr);
}
}
void nsLookAndFeel::EnsureInit() {
GdkColor colorValue;
GdkColor* colorValuePtr;
if (mInitialized) {
return;
}
// Gtk manages a screen's CSS in the settings object so we
// ask Gtk to create it explicitly. Otherwise we may end up
// with wrong color theme, see Bug 972382
GdkScreen* screen = gdk_screen_get_default();
if (MOZ_UNLIKELY(!screen)) {
NS_WARNING("EnsureInit: No screen");
return;
}
GtkSettings* settings = gtk_settings_get_for_screen(screen);
if (MOZ_UNLIKELY(!settings)) {
NS_WARNING("EnsureInit: No settings");
return;
}
mInitialized = true;
// gtk does non threadsafe refcounting
MOZ_ASSERT(NS_IsMainThread());
GtkStyleContext* style;
if (XRE_IsContentProcess()) {
LOG(("nsLookAndFeel::EnsureInit() [%p] Content process\n", (void*)this));
// Dark themes interacts poorly with widget styling (see bug 1216658).
// We disable dark themes by default for web content
// but allow user to overide it by prefs.
ConfigureContentGtkTheme();
} else {
// It seems GTK doesn't have an API to query if the current theme is
// "light" or "dark", so we synthesize it from the CSS2 Window/WindowText
// colors instead, by comparing their luminosity.
GdkRGBA bg, fg;
style = GetStyleContext(MOZ_GTK_WINDOW);
gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL, &bg);
gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &fg);
LOG(("nsLookAndFeel::EnsureInit() [%p] Chrome process\n", (void*)this));
// Update mSystemUsesDarkTheme only in the parent process since in the child
// processes we forcibly set gtk-theme-name so that we can't get correct
// results. Instead mSystemUsesDarkTheme in the child processes is updated
// via our caching machinery.
mSystemUsesDarkTheme =
(RelativeLuminanceUtils::Compute(GDK_RGBA_TO_NS_RGBA(bg)) <
RelativeLuminanceUtils::Compute(GDK_RGBA_TO_NS_RGBA(fg)));
mHighContrast = StaticPrefs::widget_content_gtk_high_contrast_enabled() &&
GetGtkTheme().Find(NS_LITERAL_CSTRING("HighContrast")) >= 0;
}
// The label is not added to a parent widget, but shared for constructing
// different style contexts. The node hierarchy is constructed only on
// the label style context.
GtkWidget* labelWidget = gtk_label_new("M");
g_object_ref_sink(labelWidget);
// Scrollbar colors
GdkRGBA color;
style = GetStyleContext(MOZ_GTK_SCROLLBAR_TROUGH_VERTICAL);
gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL, &color);
mMozScrollbar = GDK_RGBA_TO_NS_RGBA(color);
// Window colors
style = GetStyleContext(MOZ_GTK_WINDOW);
gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL, &color);
mMozWindowBackground = GDK_RGBA_TO_NS_RGBA(color);
gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &color);
mMozWindowText = GDK_RGBA_TO_NS_RGBA(color);
gtk_style_context_get_border_color(style, GTK_STATE_FLAG_NORMAL, &color);
mMozWindowActiveBorder = GDK_RGBA_TO_NS_RGBA(color);
gtk_style_context_get_border_color(style, GTK_STATE_FLAG_INSENSITIVE, &color);
mMozWindowInactiveBorder = GDK_RGBA_TO_NS_RGBA(color);
gtk_style_context_get_background_color(style, GTK_STATE_FLAG_INSENSITIVE,
&color);
mMozWindowInactiveCaption = GDK_RGBA_TO_NS_RGBA(color);
style = GetStyleContext(MOZ_GTK_WINDOW_CONTAINER);
{
GtkStyleContext* labelStyle = CreateStyleForWidget(labelWidget, style);
GetSystemFontInfo(labelStyle, &mDefaultFontName, &mDefaultFontStyle);
g_object_unref(labelStyle);
}
// tooltip foreground and background
style = GetStyleContext(MOZ_GTK_TOOLTIP);
gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL, &color);
mInfoBackground = GDK_RGBA_TO_NS_RGBA(color);
style = GetStyleContext(MOZ_GTK_TOOLTIP_BOX_LABEL);
gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &color);
mInfoText = GDK_RGBA_TO_NS_RGBA(color);
style = GetStyleContext(MOZ_GTK_MENUITEM);
{
GtkStyleContext* accelStyle =
CreateStyleForWidget(gtk_accel_label_new("M"), style);
GetSystemFontInfo(accelStyle, &mMenuFontName, &mMenuFontStyle);
gtk_style_context_get_color(accelStyle, GTK_STATE_FLAG_NORMAL, &color);
mMenuText = GDK_RGBA_TO_NS_RGBA(color);
gtk_style_context_get_color(accelStyle, GTK_STATE_FLAG_INSENSITIVE, &color);
mMenuTextInactive = GDK_RGBA_TO_NS_RGBA(color);
g_object_unref(accelStyle);
}
style = GetStyleContext(MOZ_GTK_MENUPOPUP);
gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL, &color);
mMenuBackground = GDK_RGBA_TO_NS_RGBA(color);
style = GetStyleContext(MOZ_GTK_MENUITEM);
gtk_style_context_get_background_color(style, GTK_STATE_FLAG_PRELIGHT,
&color);
mMenuHover = GDK_RGBA_TO_NS_RGBA(color);
gtk_style_context_get_color(style, GTK_STATE_FLAG_PRELIGHT, &color);
mMenuHoverText = GDK_RGBA_TO_NS_RGBA(color);
GtkWidget* parent = gtk_fixed_new();
GtkWidget* window = gtk_window_new(GTK_WINDOW_POPUP);
GtkWidget* treeView = gtk_tree_view_new();
GtkWidget* linkButton = gtk_link_button_new("http://example.com/");
GtkWidget* menuBar = gtk_menu_bar_new();
GtkWidget* menuBarItem = gtk_menu_item_new();
GtkWidget* entry = gtk_entry_new();
GtkWidget* textView = gtk_text_view_new();
gtk_container_add(GTK_CONTAINER(parent), treeView);
gtk_container_add(GTK_CONTAINER(parent), linkButton);
gtk_container_add(GTK_CONTAINER(parent), menuBar);
gtk_menu_shell_append(GTK_MENU_SHELL(menuBar), menuBarItem);
gtk_container_add(GTK_CONTAINER(window), parent);
gtk_container_add(GTK_CONTAINER(parent), entry);
gtk_container_add(GTK_CONTAINER(parent), textView);
// Text colors
GdkRGBA bgColor;
// If the text window background is translucent, then the background of
// the textview root node is visible.
style = GetStyleContext(MOZ_GTK_TEXT_VIEW);
gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL,
&bgColor);
style = GetStyleContext(MOZ_GTK_TEXT_VIEW_TEXT);
gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL, &color);
ApplyColorOver(color, &bgColor);
mFieldBackground = GDK_RGBA_TO_NS_RGBA(bgColor);
gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &color);
mFieldText = GDK_RGBA_TO_NS_RGBA(color);
// Selected text and background
gtk_style_context_get_background_color(
style,
static_cast<GtkStateFlags>(GTK_STATE_FLAG_FOCUSED |
GTK_STATE_FLAG_SELECTED),
&color);
mTextSelectedBackground = GDK_RGBA_TO_NS_RGBA(color);
gtk_style_context_get_color(
style,
static_cast<GtkStateFlags>(GTK_STATE_FLAG_FOCUSED |
GTK_STATE_FLAG_SELECTED),
&color);
mTextSelectedText = GDK_RGBA_TO_NS_RGBA(color);
// Button text color
style = GetStyleContext(MOZ_GTK_BUTTON);
{
GtkStyleContext* labelStyle = CreateStyleForWidget(labelWidget, style);
GetSystemFontInfo(labelStyle, &mButtonFontName, &mButtonFontStyle);
g_object_unref(labelStyle);
}
gtk_style_context_get_border_color(style, GTK_STATE_FLAG_NORMAL, &color);
mButtonDefault = GDK_RGBA_TO_NS_RGBA(color);
gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &color);
mButtonText = GDK_RGBA_TO_NS_RGBA(color);
gtk_style_context_get_color(style, GTK_STATE_FLAG_PRELIGHT, &color);
mButtonHoverText = GDK_RGBA_TO_NS_RGBA(color);
gtk_style_context_get_color(style, GTK_STATE_FLAG_ACTIVE, &color);
mButtonActiveText = GDK_RGBA_TO_NS_RGBA(color);
gtk_style_context_get_background_color(style, GTK_STATE_FLAG_PRELIGHT,
&color);
mButtonHoverFace = GDK_RGBA_TO_NS_RGBA(color);
// Combobox text color
style = GetStyleContext(MOZ_GTK_COMBOBOX_ENTRY_TEXTAREA);
gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &color);
mComboBoxText = GDK_RGBA_TO_NS_RGBA(color);
// Menubar text and hover text colors
style = GetStyleContext(MOZ_GTK_MENUBARITEM);
gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &color);
mMenuBarText = GDK_RGBA_TO_NS_RGBA(color);
gtk_style_context_get_color(style, GTK_STATE_FLAG_PRELIGHT, &color);
mMenuBarHoverText = GDK_RGBA_TO_NS_RGBA(color);
// GTK's guide to fancy odd row background colors:
// 1) Check if a theme explicitly defines an odd row color
// 2) If not, check if it defines an even row color, and darken it
// slightly by a hardcoded value (gtkstyle.c)
// 3) If neither are defined, take the base background color and
// darken that by a hardcoded value
style = GetStyleContext(MOZ_GTK_TREEVIEW);
// Get odd row background color
gtk_style_context_save(style);
gtk_style_context_add_region(style, GTK_STYLE_REGION_ROW, GTK_REGION_ODD);
gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL, &color);
mOddCellBackground = GDK_RGBA_TO_NS_RGBA(color);
gtk_style_context_restore(style);
// Compute cell highlight colors
InitCellHighlightColors();
// GtkFrame has a "border" subnode on which Adwaita draws the border.
// Some themes do not draw on this node but draw a border on the widget
// root node, so check the root node if no border is found on the border
// node.
style = GetStyleContext(MOZ_GTK_FRAME_BORDER);
bool themeUsesColors =
GetBorderColors(style, &mFrameOuterLightBorder, &mFrameInnerDarkBorder);
if (!themeUsesColors) {
style = GetStyleContext(MOZ_GTK_FRAME);
GetBorderColors(style, &mFrameOuterLightBorder, &mFrameInnerDarkBorder);
}
// GtkInfoBar
// TODO - Use WidgetCache for it?
GtkWidget* infoBar = gtk_info_bar_new();
GtkWidget* infoBarContent =
gtk_info_bar_get_content_area(GTK_INFO_BAR(infoBar));
GtkWidget* infoBarLabel = gtk_label_new(nullptr);
gtk_container_add(GTK_CONTAINER(parent), infoBar);
gtk_container_add(GTK_CONTAINER(infoBarContent), infoBarLabel);
style = gtk_widget_get_style_context(infoBarLabel);
gtk_style_context_add_class(style, GTK_STYLE_CLASS_INFO);
gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &color);
mInfoBarText = GDK_RGBA_TO_NS_RGBA(color);
// Some themes have a unified menu bar, and support window dragging on it
gboolean supports_menubar_drag = FALSE;
GParamSpec* param_spec = gtk_widget_class_find_style_property(
GTK_WIDGET_GET_CLASS(menuBar), "window-dragging");
if (param_spec) {
if (g_type_is_a(G_PARAM_SPEC_VALUE_TYPE(param_spec), G_TYPE_BOOLEAN)) {
gtk_widget_style_get(menuBar, "window-dragging", &supports_menubar_drag,
nullptr);
}
}
mMenuSupportsDrag = supports_menubar_drag;
if (gtk_check_version(3, 12, 0) == nullptr) {
// TODO: It returns wrong color for themes which
// sets link color for GtkLabel only as we query
// GtkLinkButton style here.
style = gtk_widget_get_style_context(linkButton);
gtk_style_context_get_color(style, GTK_STATE_FLAG_LINK, &color);
mNativeHyperLinkText = GDK_RGBA_TO_NS_RGBA(color);
} else {
colorValuePtr = nullptr;
gtk_widget_style_get(linkButton, "link-color", &colorValuePtr, nullptr);
if (colorValuePtr) {
colorValue = *colorValuePtr; // we can't pass deref pointers to
// GDK_COLOR_TO_NS_RGB
mNativeHyperLinkText = GDK_COLOR_TO_NS_RGB(colorValue);
gdk_color_free(colorValuePtr);
} else {
mNativeHyperLinkText = NS_RGB(0x00, 0x00, 0xEE);
}
}
// invisible character styles
guint value;
g_object_get(entry, "invisible-char", &value, nullptr);
mInvisibleCharacter = char16_t(value);
// caret styles
gtk_widget_style_get(entry, "cursor-aspect-ratio", &mCaretRatio, nullptr);
gint blink_time;
gboolean blink;
g_object_get(settings, "gtk-cursor-blink-time", &blink_time,
"gtk-cursor-blink", &blink, nullptr);
mCaretBlinkTime = blink ? (int32_t)blink_time : 0;
GetSystemFontInfo(gtk_widget_get_style_context(entry), &mFieldFontName,
&mFieldFontStyle);
gtk_widget_destroy(window);
g_object_unref(labelWidget);
mCSDAvailable =
nsWindow::GetSystemCSDSupportLevel() != nsWindow::CSD_SUPPORT_NONE;
mCSDHideTitlebarByDefault = nsWindow::HideTitlebarByDefault();
mCSDCloseButton = false;
mCSDMinimizeButton = false;
mCSDMaximizeButton = false;
// We need to initialize whole CSD config explicitly because it's queried
// as -moz-gtk* media features.
WidgetNodeType buttonLayout[TOOLBAR_BUTTONS];
int activeButtons = GetGtkHeaderBarButtonLayout(buttonLayout, TOOLBAR_BUTTONS,
&mCSDReversedPlacement);
for (int i = 0; i < activeButtons; i++) {
switch (buttonLayout[i]) {
case MOZ_GTK_HEADER_BAR_BUTTON_MINIMIZE:
mCSDMinimizeButton = true;
break;
case MOZ_GTK_HEADER_BAR_BUTTON_MAXIMIZE:
mCSDMaximizeButton = true;
break;
case MOZ_GTK_HEADER_BAR_BUTTON_CLOSE:
mCSDCloseButton = true;
break;
default:
break;
}
}
RecordTelemetry();
}
// virtual
char16_t nsLookAndFeel::GetPasswordCharacterImpl() {
EnsureInit();
return mInvisibleCharacter;
}
bool nsLookAndFeel::GetEchoPasswordImpl() { return false; }
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