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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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/. */
+
+#ifndef __LookAndFeel
+#define __LookAndFeel
+
+#ifndef MOZILLA_INTERNAL_API
+# error "This header is only usable from within libxul (MOZILLA_INTERNAL_API)."
+#endif
+
+#include "nsDebug.h"
+#include "nsColor.h"
+#include "nsString.h"
+#include "nsTArray.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/widget/ThemeChangeKind.h"
+#include "mozilla/ColorScheme.h"
+
+struct gfxFontStyle;
+
+class nsIFrame;
+
+namespace mozilla {
+
+using Modifiers = uint16_t;
+struct StyleColorSchemeFlags;
+
+namespace dom {
+class Document;
+}
+
+namespace widget {
+class FullLookAndFeel;
+} // namespace widget
+
+enum class StyleSystemColor : uint8_t;
+enum class StyleSystemColorScheme : uint8_t;
+enum class StyleSystemFont : uint8_t;
+
+class LookAndFeel {
+ public:
+ using ColorID = StyleSystemColor;
+ using ColorScheme = mozilla::ColorScheme;
+
+ // When modifying this list, also modify nsXPLookAndFeel::sIntPrefs
+ // in widget/xpwidgts/nsXPLookAndFeel.cpp.
+ enum class IntID {
+ // default, may be overriden by OS
+ CaretBlinkTime,
+ // Amount of blinks that happen before the caret stops blinking.
+ CaretBlinkCount,
+ // pixel width of caret
+ CaretWidth,
+ // show the caret when text is selected?
+ ShowCaretDuringSelection,
+ // select textfields when focused via tab/accesskey?
+ SelectTextfieldsOnKeyFocus,
+ // delay before submenus open
+ SubmenuDelay,
+ // can popups overlap menu/task bar?
+ MenusCanOverlapOSBar,
+ // should overlay scrollbars be used?
+ UseOverlayScrollbars,
+ // allow H and V overlay scrollbars to overlap?
+ AllowOverlayScrollbarsOverlap,
+ // skip navigating to disabled menu item?
+ SkipNavigatingDisabledMenuItem,
+ // begin a drag if the mouse is moved further than the threshold while the
+ // button is down
+ DragThresholdX,
+ DragThresholdY,
+ // Accessibility theme being used?
+ UseAccessibilityTheme,
+
+ // position of scroll arrows in a scrollbar
+ ScrollArrowStyle,
+
+ // each button can take one of four values:
+ ScrollButtonLeftMouseButtonAction,
+ // 0 - scrolls one line, 1 - scrolls one page
+ ScrollButtonMiddleMouseButtonAction,
+ // 2 - scrolls to end, 3 - button ignored
+ ScrollButtonRightMouseButtonAction,
+
+ // delay for opening spring loaded folders
+ TreeOpenDelay,
+ // delay for closing spring loaded folders
+ TreeCloseDelay,
+ // delay for triggering the tree scrolling
+ TreeLazyScrollDelay,
+ // delay for scrolling the tree
+ TreeScrollDelay,
+ // the maximum number of lines to be scrolled at ones
+ TreeScrollLinesMax,
+ // What type of tab-order to use
+ TabFocusModel,
+ // Should menu items blink when they're chosen?
+ ChosenMenuItemsShouldBlink,
+
+ /*
+ * A Boolean value to determine whether the Windows accent color
+ * should be applied to the title bar.
+ *
+ * The value of this metric is not used on other platforms. These platforms
+ * should return NS_ERROR_NOT_IMPLEMENTED when queried for this metric.
+ */
+ WindowsAccentColorInTitlebar,
+
+ /*
+ * A Boolean value to determine whether the Windows default theme is
+ * being used.
+ *
+ * The value of this metric is not used on other platforms. These platforms
+ * should return NS_ERROR_NOT_IMPLEMENTED when queried for this metric.
+ */
+ WindowsDefaultTheme,
+
+ /*
+ * A Boolean value to determine whether the DWM compositor is being used
+ *
+ * This metric is not used on non-Windows platforms. These platforms
+ * should return NS_ERROR_NOT_IMPLEMENTED when queried for this metric.
+ */
+ DWMCompositor,
+
+ /*
+ * A Boolean value to determine whether Windows is themed (Classic vs.
+ * uxtheme)
+ *
+ * This is Windows-specific and is not implemented on other platforms
+ * (will return the default of NS_ERROR_FAILURE).
+ */
+ WindowsClassic,
+
+ /*
+ * A Boolean value to determine whether the current Windows desktop theme
+ * supports Aero Glass.
+ *
+ * This is Windows-specific and is not implemented on other platforms
+ * (will return the default of NS_ERROR_FAILURE).
+ */
+ WindowsGlass,
+
+ /*
+ * A Boolean value to determine whether the Mac graphite theme is
+ * being used.
+ */
+ MacGraphiteTheme,
+
+ /*
+ * A Boolean value to determine whether the macOS Big Sur-specific
+ * theming should be used.
+ */
+ MacBigSurTheme,
+
+ /*
+ * A Boolean value to determine whether macOS is in RTL mode or not.
+ */
+ MacRTL,
+
+ /*
+ * AlertNotificationOrigin indicates from which corner of the
+ * screen alerts slide in, and from which direction (horizontal/vertical).
+ * 0, the default, represents bottom right, sliding vertically.
+ * Use any bitwise combination of the following constants:
+ * NS_ALERT_HORIZONTAL (1), NS_ALERT_LEFT (2), NS_ALERT_TOP (4).
+ *
+ * 6 4
+ * +-----------+
+ * 7| |5
+ * | |
+ * 3| |1
+ * +-----------+
+ * 2 0
+ */
+ AlertNotificationOrigin,
+
+ /**
+ * If true, clicking on a scrollbar (not as in dragging the thumb) defaults
+ * to scrolling the view corresponding to the clicked point. Otherwise, we
+ * only do so if the scrollbar is clicked using the middle mouse button or
+ * if shift is pressed when the scrollbar is clicked.
+ */
+ ScrollToClick,
+
+ /**
+ * IME and spell checker underline styles, the values should be
+ * NS_DECORATION_LINE_STYLE_*. They are defined below.
+ */
+ IMERawInputUnderlineStyle,
+ IMESelectedRawTextUnderlineStyle,
+ IMEConvertedTextUnderlineStyle,
+ IMESelectedConvertedTextUnderline,
+ SpellCheckerUnderlineStyle,
+
+ /**
+ * If this metric != 0, support window dragging on the menubar.
+ */
+ MenuBarDrag,
+ /**
+ * 0: scrollbar button repeats to scroll only when cursor is on the button.
+ * 1: scrollbar button repeats to scroll even if cursor is outside of it.
+ */
+ ScrollbarButtonAutoRepeatBehavior,
+ /**
+ * Delay before showing a tooltip.
+ */
+ TooltipDelay,
+ /*
+ * A Boolean value to determine whether swipe animations should be used.
+ */
+ SwipeAnimationEnabled,
+
+ /*
+ * Controls whether overlay scrollbars display when the user moves
+ * the mouse in a scrollable frame.
+ */
+ ScrollbarDisplayOnMouseMove,
+
+ /*
+ * Overlay scrollbar animation constants.
+ */
+ ScrollbarFadeBeginDelay,
+ ScrollbarFadeDuration,
+
+ /**
+ * Distance in pixels to offset the context menu from the cursor
+ * on open.
+ */
+ ContextMenuOffsetVertical,
+ ContextMenuOffsetHorizontal,
+
+ /*
+ * A boolean value indicating whether client-side decorations are
+ * supported by the user's GTK version.
+ */
+ GTKCSDAvailable,
+
+ /*
+ * A boolean value indicating whether client-side decorations should
+ * contain a minimize button.
+ */
+ GTKCSDMinimizeButton,
+
+ /*
+ * A boolean value indicating whether client-side decorations should
+ * contain a maximize button.
+ */
+ GTKCSDMaximizeButton,
+
+ /*
+ * A boolean value indicating whether client-side decorations should
+ * contain a close button.
+ */
+ GTKCSDCloseButton,
+
+ /**
+ * An Integer value that will represent the position of the Minimize button
+ * in GTK Client side decoration header.
+ */
+ GTKCSDMinimizeButtonPosition,
+
+ /**
+ * An Integer value that will represent the position of the Maximize button
+ * in GTK Client side decoration header.
+ */
+ GTKCSDMaximizeButtonPosition,
+
+ /**
+ * An Integer value that will represent the position of the Close button
+ * in GTK Client side decoration header.
+ */
+ GTKCSDCloseButtonPosition,
+
+ /*
+ * A boolean value indicating whether titlebar buttons are located
+ * in left titlebar corner.
+ */
+ GTKCSDReversedPlacement,
+
+ /*
+ * A boolean value indicating whether or not the OS is using a dark theme,
+ * which we may want to switch to as well if not overridden by the user.
+ */
+ SystemUsesDarkTheme,
+
+ /**
+ * Corresponding to prefers-reduced-motion.
+ * https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-motion
+ * 0: no-preference
+ * 1: reduce
+ */
+ PrefersReducedMotion,
+
+ /**
+ * Corresponding to prefers-reduced-transparency.
+ * https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-transparency
+ * 0: no-preference
+ * 1: reduce
+ */
+ PrefersReducedTransparency,
+
+ /**
+ * Corresponding to inverted-colors.
+ * https://drafts.csswg.org/mediaqueries-5/#inverted
+ * 0: none
+ * 1: inverted
+ */
+ InvertedColors,
+
+ /**
+ * Corresponding to PointerCapabilities in ServoTypes.h
+ * 0: None
+ * 1: Coarse
+ * 2: Fine
+ * 4: Hover
+ */
+ PrimaryPointerCapabilities,
+ /**
+ * Corresponding to union of PointerCapabilities values in ServoTypes.h
+ * E.g. if there is a mouse and a digitizer, the value will be
+ * 'Coarse | Fine | Hover'.
+ */
+ AllPointerCapabilities,
+
+ /** The scrollbar size, in CSS pixels. */
+ SystemScrollbarSize,
+
+ /** A boolean value to determine whether a touch device is present */
+ TouchDeviceSupportPresent,
+
+ /** GTK titlebar radius */
+ TitlebarRadius,
+
+ /**
+ * Corresponding to dynamic-range.
+ * https://drafts.csswg.org/mediaqueries-5/#dynamic-range
+ * 0: Standard
+ * 1: High
+ */
+ DynamicRange,
+ VideoDynamicRange,
+
+ /** Whether XUL panel animations are enabled. */
+ PanelAnimations,
+
+ /*
+ * Not an ID; used to define the range of valid IDs. Must be last.
+ */
+ End,
+ };
+
+ // This is a common enough integer that seems worth the shortcut.
+ static bool UseOverlayScrollbars() {
+ return GetInt(IntID::UseOverlayScrollbars);
+ }
+
+ // Returns keyCode value of a modifier key which is used for accesskey.
+ // Returns 0 if the platform doesn't support access key.
+ static uint32_t GetMenuAccessKey();
+ // Modifier mask for the menu accesskey.
+ static Modifiers GetMenuAccessKeyModifiers();
+
+ enum {
+ eScrollArrow_None = 0,
+ eScrollArrow_StartBackward = 0x1000,
+ eScrollArrow_StartForward = 0x0100,
+ eScrollArrow_EndBackward = 0x0010,
+ eScrollArrow_EndForward = 0x0001
+ };
+
+ enum {
+ // single arrow at each end
+ eScrollArrowStyle_Single =
+ eScrollArrow_StartBackward | eScrollArrow_EndForward,
+ // both arrows at bottom/right, none at top/left
+ eScrollArrowStyle_BothAtBottom =
+ eScrollArrow_EndBackward | eScrollArrow_EndForward,
+ // both arrows at both ends
+ eScrollArrowStyle_BothAtEachEnd =
+ eScrollArrow_EndBackward | eScrollArrow_EndForward |
+ eScrollArrow_StartBackward | eScrollArrow_StartForward,
+ // both arrows at top/left, none at bottom/right
+ eScrollArrowStyle_BothAtTop =
+ eScrollArrow_StartBackward | eScrollArrow_StartForward
+ };
+
+ // When modifying this list, also modify nsXPLookAndFeel::sFloatPrefs
+ // in widget/nsXPLookAndFeel.cpp.
+ enum class FloatID {
+ IMEUnderlineRelativeSize,
+ SpellCheckerUnderlineRelativeSize,
+
+ // The width/height ratio of the cursor. If used, the CaretWidth int metric
+ // should be added to the calculated caret width.
+ CaretAspectRatio,
+
+ // GTK text scale factor.
+ TextScaleFactor,
+
+ // Mouse pointer scaling factor.
+ CursorScale,
+
+ // Not an ID; used to define the range of valid IDs. Must be last.
+ End,
+ };
+
+ using FontID = mozilla::StyleSystemFont;
+
+ static bool WindowsNonNativeMenusEnabled();
+
+ static ColorScheme SystemColorScheme() {
+ return GetInt(IntID::SystemUsesDarkTheme) ? ColorScheme::Dark
+ : ColorScheme::Light;
+ }
+
+ static bool IsDarkColor(nscolor);
+
+ enum class ChromeColorSchemeSetting { Light, Dark, System };
+ static ChromeColorSchemeSetting ColorSchemeSettingForChrome();
+ static ColorScheme ThemeDerivedColorSchemeForContent();
+
+ static ColorScheme ColorSchemeForChrome() {
+ MOZ_ASSERT(sColorSchemeInitialized);
+ return sChromeColorScheme;
+ }
+ static ColorScheme PreferredColorSchemeForContent() {
+ MOZ_ASSERT(sColorSchemeInitialized);
+ return sContentColorScheme;
+ }
+
+ static ColorScheme ColorSchemeForStyle(
+ const dom::Document&, const StyleColorSchemeFlags&,
+ ColorSchemeMode = ColorSchemeMode::Used);
+ static ColorScheme ColorSchemeForFrame(
+ const nsIFrame*, ColorSchemeMode = ColorSchemeMode::Used);
+
+ // Whether standins for native colors should be used (that is, colors faked,
+ // taken from win7, mostly). This forces light appearance, effectively.
+ enum class UseStandins : bool { No, Yes };
+ static UseStandins ShouldUseStandins(const dom::Document&, ColorID);
+
+ // Returns a native color value (might be overwritten by prefs) for a given
+ // color id.
+ //
+ // NOTE:
+ // ColorID::TextSelectForeground might return NS_SAME_AS_FOREGROUND_COLOR.
+ // ColorID::IME* might return NS_TRANSPARENT, NS_SAME_AS_FOREGROUND_COLOR or
+ // NS_40PERCENT_FOREGROUND_COLOR.
+ // These values have particular meaning. Then, they are not an actual
+ // color value.
+ static Maybe<nscolor> GetColor(ColorID, ColorScheme, UseStandins);
+
+ // Gets the color with appropriate defaults for UseStandins, ColorScheme etc
+ // for a given frame.
+ static Maybe<nscolor> GetColor(ColorID, const nsIFrame*);
+
+ // Versions of the above which returns the color if found, or a default (which
+ // defaults to opaque black) otherwise.
+ static nscolor Color(ColorID aId, ColorScheme aScheme,
+ UseStandins aUseStandins,
+ nscolor aDefault = NS_RGB(0, 0, 0)) {
+ return GetColor(aId, aScheme, aUseStandins).valueOr(aDefault);
+ }
+
+ static nscolor Color(ColorID aId, nsIFrame* aFrame,
+ nscolor aDefault = NS_RGB(0, 0, 0)) {
+ return GetColor(aId, aFrame).valueOr(aDefault);
+ }
+
+ static float GetTextScaleFactor() {
+ float f = GetFloat(FloatID::TextScaleFactor, 1.0f);
+ if (MOZ_UNLIKELY(f <= 0.0f)) {
+ return 1.0f;
+ }
+ return f;
+ }
+
+ struct ZoomSettings {
+ float mFullZoom = 1.0f;
+ float mTextZoom = 1.0f;
+ };
+
+ static ZoomSettings SystemZoomSettings();
+
+ /**
+ * GetInt() and GetFloat() return a int or float value for aID. The result
+ * might be distance, time, some flags or a int value which has particular
+ * meaning. See each document at definition of each ID for the detail.
+ * The result is always 0 when they return error. Therefore, if you want to
+ * use a value for the default value, you should use the other method which
+ * returns int or float directly.
+ */
+ static nsresult GetInt(IntID, int32_t* aResult);
+ static nsresult GetFloat(FloatID aID, float* aResult);
+
+ static int32_t GetInt(IntID aID, int32_t aDefault = 0) {
+ int32_t result;
+ if (NS_FAILED(GetInt(aID, &result))) {
+ return aDefault;
+ }
+ return result;
+ }
+
+ static float GetFloat(FloatID aID, float aDefault = 0.0f) {
+ float result;
+ if (NS_FAILED(GetFloat(aID, &result))) {
+ return aDefault;
+ }
+ return result;
+ }
+
+ /**
+ * Retrieve the name and style of a system-theme font. Returns true
+ * if the system theme specifies this font, false if a default should
+ * be used. In the latter case neither aName nor aStyle is modified.
+ *
+ * Size of the font should be in CSS pixels, not device pixels.
+ *
+ * @param aID Which system-theme font is wanted.
+ * @param aName The name of the font to use.
+ * @param aStyle Styling to apply to the font.
+ */
+ static bool GetFont(FontID aID, nsString& aName, gfxFontStyle& aStyle);
+
+ /**
+ * GetPasswordCharacter() returns a unicode character which should be used
+ * for a masked character in password editor. E.g., '*'.
+ */
+ static char16_t GetPasswordCharacter();
+
+ /**
+ * If the latest character in password field shouldn't be hidden by the
+ * result of GetPasswordCharacter(), GetEchoPassword() returns TRUE.
+ * Otherwise, FALSE.
+ */
+ static bool GetEchoPassword();
+
+ /**
+ * Whether we should be drawing in the titlebar by default.
+ */
+ static bool DrawInTitlebar();
+
+ /**
+ * The millisecond to mask password value.
+ * This value is only valid when GetEchoPassword() returns true.
+ */
+ static uint32_t GetPasswordMaskDelay();
+
+ /** Gets theme information for about:support */
+ static void GetThemeInfo(nsACString&);
+
+ /**
+ * When system look and feel is changed, Refresh() must be called. Then,
+ * cached data would be released.
+ */
+ static void Refresh();
+
+ /**
+ * GTK's initialization code can't be run off main thread, call this
+ * if you plan on using LookAndFeel off main thread later.
+ *
+ * This initialized state may get reset due to theme changes, so it
+ * must be called prior to each potential off-main-thread LookAndFeel
+ * call, not just once.
+ */
+ static void NativeInit();
+
+ static void SetData(widget::FullLookAndFeel&& aTables);
+ static void NotifyChangedAllWindows(widget::ThemeChangeKind);
+ static bool HasPendingGlobalThemeChange() { return sGlobalThemeChanged; }
+ static void HandleGlobalThemeChange() {
+ if (MOZ_UNLIKELY(HasPendingGlobalThemeChange())) {
+ DoHandleGlobalThemeChange();
+ }
+ }
+ static void EnsureColorSchemesInitialized() {
+ if (!sColorSchemeInitialized) {
+ RecomputeColorSchemes();
+ }
+ MOZ_ASSERT(sColorSchemeInitialized);
+ }
+
+ static ColorScheme sChromeColorScheme;
+ static ColorScheme sContentColorScheme;
+
+ protected:
+ static void RecomputeColorSchemes();
+ static bool sColorSchemeInitialized;
+
+ static void DoHandleGlobalThemeChange();
+ // Set to true when ThemeChanged needs to be called on mTheme (and other
+ // global LookAndFeel. This is used because mTheme is a service, so there's
+ // no need to notify it from more than one prescontext.
+ static bool sGlobalThemeChanged;
+};
+
+} // namespace mozilla
+
+// ---------------------------------------------------------------------
+// Special colors for ColorID::IME* and ColorID::SpellCheckerUnderline
+// ---------------------------------------------------------------------
+
+// For background color only.
+constexpr nscolor NS_TRANSPARENT = NS_RGBA(0x01, 0x00, 0x00, 0x00);
+// For foreground color only.
+constexpr nscolor NS_SAME_AS_FOREGROUND_COLOR = NS_RGBA(0x02, 0x00, 0x00, 0x00);
+constexpr nscolor NS_40PERCENT_FOREGROUND_COLOR =
+ NS_RGBA(0x03, 0x00, 0x00, 0x00);
+
+#define NS_IS_SELECTION_SPECIAL_COLOR(c) \
+ ((c) == NS_TRANSPARENT || (c) == NS_SAME_AS_FOREGROUND_COLOR || \
+ (c) == NS_40PERCENT_FOREGROUND_COLOR)
+
+// ------------------------------------------
+// Bits for IntID::AlertNotificationOrigin
+// ------------------------------------------
+
+#define NS_ALERT_HORIZONTAL 1
+#define NS_ALERT_LEFT 2
+#define NS_ALERT_TOP 4
+
+#endif /* __LookAndFeel */